summaryrefslogtreecommitdiffstats
path: root/src/opengl/qgl.cpp
blob: c0c77815e4d4a751593ce3e2ff722d2745d7b024 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtOpenGL module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at qt-sales@nokia.com.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qapplication.h"
#include "qplatformdefs.h"
#include "qgl.h"
#include <qdebug.h>

#if defined(Q_WS_X11)
#include "private/qt_x11_p.h"
#include "private/qpixmap_x11_p.h"
#define INT32 dummy_INT32
#define INT8 dummy_INT8
#if !defined(QT_OPENGL_ES)
# include <GL/glx.h>
#endif
#undef INT32
#undef INT8
#include "qx11info_x11.h"
#elif defined(Q_WS_MAC)
# include <private/qt_mac_p.h>
#endif

#include <stdlib.h> // malloc

#include "qpixmap.h"
#include "qimage.h"
#include "qgl_p.h"

#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
#include "gl2paintengineex/qpaintengineex_opengl2_p.h"
#endif

#ifndef QT_OPENGL_ES_2
#include <private/qpaintengine_opengl_p.h>
#endif

#ifdef Q_WS_QWS
#include <private/qglpaintdevice_qws_p.h>
#include <private/qglwindowsurface_qws_p.h>
#endif

#include <qglpixelbuffer.h>
#include <qglframebufferobject.h>

#include <private/qimage_p.h>
#include <private/qpixmapdata_p.h>
#include <private/qpixmapdata_gl_p.h>
#include <private/qglpixelbuffer_p.h>
#include <private/qwindowsurface_gl_p.h>
#include "qcolormap.h"
#include "qcache.h"
#include "qfile.h"
#include "qlibrary.h"


QT_BEGIN_NAMESPACE

#ifdef QT_OPENGL_ES_1_CL
#include "qgl_cl_p.h"
#endif


#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
QGLExtensionFuncs QGLContextPrivate::qt_extensionFuncs;
#endif

QThreadStorage<QGLThreadContext *> qgl_context_storage;

Q_GLOBAL_STATIC(QGLFormat, qgl_default_format)

class QGLDefaultOverlayFormat: public QGLFormat
{
public:
    inline QGLDefaultOverlayFormat()
    {
        setOption(QGL::FormatOption(0xffff << 16)); // turn off all options
        setOption(QGL::DirectRendering);
        setPlane(1);
    }
};
Q_GLOBAL_STATIC(QGLDefaultOverlayFormat, defaultOverlayFormatInstance)

QGLExtensions::Extensions QGLExtensions::glExtensions = 0;
bool QGLExtensions::nvidiaFboNeedsFinish = false;

#ifndef APIENTRY
# define APIENTRY
#endif
typedef void (APIENTRY *pfn_glCompressedTexImage2DARB) (GLenum, GLint, GLenum, GLsizei,
                                                        GLsizei, GLint, GLsizei, const GLvoid *);
static pfn_glCompressedTexImage2DARB qt_glCompressedTexImage2DARB = 0;


#ifndef APIENTRY
#define APIENTRY
#endif

Q_GLOBAL_STATIC(QGLSignalProxy, theSignalProxy)
QGLSignalProxy *QGLSignalProxy::instance()
{
    return theSignalProxy();
}

/*!
    \namespace QGL

    \brief The QGL namespace specifies miscellaneous identifiers used
    in the Qt OpenGL module.

    \ingroup multimedia
*/

/*!
    \enum QGL::FormatOption

    This enum specifies the format options that can be used to configure an OpenGL
    context. These are set using QGLFormat::setOption().

    \value DoubleBuffer      Specifies the use of double buffering.
    \value DepthBuffer       Enables the use of a depth buffer.
    \value Rgba              Specifies that the context should use RGBA as its pixel format.
    \value AlphaChannel      Enables the use of an alpha channel.
    \value AccumBuffer       Enables the use of an accumulation buffer.
    \value StencilBuffer     Enables the use of a stencil buffer.
    \value StereoBuffers     Enables the use of a stereo buffers for use with visualization hardware.
    \value DirectRendering   Specifies that the context is used for direct rendering to a display.
    \value HasOverlay        Enables the use of an overlay.
    \value SampleBuffers     Enables the use of sample buffers.
    \value SingleBuffer      Specifies the use of a single buffer, as opposed to double buffers.
    \value NoDepthBuffer     Disables the use of a depth buffer.
    \value ColorIndex        Specifies that the context should use a color index as its pixel format.
    \value NoAlphaChannel    Disables the use of an alpha channel.
    \value NoAccumBuffer     Disables the use of an accumulation buffer.
    \value NoStencilBuffer   Disables the use of a stencil buffer.
    \value NoStereoBuffers   Disables the use of stereo buffers.
    \value IndirectRendering Specifies that the context is used for indirect rendering to a buffer.
    \value NoOverlay         Disables the use of an overlay.
    \value NoSampleBuffers   Disables the use of sample buffers.

    \sa {Sample Buffers Example}
*/

/*****************************************************************************
  QGLFormat implementation
 *****************************************************************************/


/*!
    \class QGLFormat
    \brief The QGLFormat class specifies the display format of an OpenGL
    rendering context.

    \ingroup multimedia

    A display format has several characteristics:
    \list
    \i \link setDoubleBuffer() Double or single buffering.\endlink
    \i \link setDepth() Depth buffer.\endlink
    \i \link setRgba() RGBA or color index mode.\endlink
    \i \link setAlpha() Alpha channel.\endlink
    \i \link setAccum() Accumulation buffer.\endlink
    \i \link setStencil() Stencil buffer.\endlink
    \i \link setStereo() Stereo buffers.\endlink
    \i \link setDirectRendering() Direct rendering.\endlink
    \i \link setOverlay() Presence of an overlay.\endlink
    \i \link setPlane() The plane of an overlay format.\endlink
    \i \link setSampleBuffers() Multisample buffers.\endlink
    \endlist

    You can also specify preferred bit depths for the depth buffer,
    alpha buffer, accumulation buffer and the stencil buffer with the
    functions: setDepthBufferSize(), setAlphaBufferSize(),
    setAccumBufferSize() and setStencilBufferSize().

    Note that even if you specify that you prefer a 32 bit depth
    buffer (e.g. with setDepthBufferSize(32)), the format that is
    chosen may not have a 32 bit depth buffer, even if there is a
    format available with a 32 bit depth buffer. The main reason for
    this is how the system dependant picking algorithms work on the
    different platforms, and some format options may have higher
    precedence than others.

    You create and tell a QGLFormat object what rendering options you
    want from an OpenGL rendering context.

    OpenGL drivers or accelerated hardware may or may not support
    advanced features such as alpha channel or stereographic viewing.
    If you request some features that the driver/hardware does not
    provide when you create a QGLWidget, you will get a rendering
    context with the nearest subset of features.

    There are different ways to define the display characteristics of
    a rendering context. One is to create a QGLFormat and make it the
    default for the entire application:
    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 0

    Or you can specify the desired format when creating an object of
    your QGLWidget subclass:
    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 1

    After the widget has been created, you can find out which of the
    requested features the system was able to provide:
    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 2

    \legalese
        OpenGL is a trademark of Silicon Graphics, Inc. in the
        United States and other countries.
    \endlegalese

    \sa QGLContext, QGLWidget
*/

static inline void transform_point(GLdouble out[4], const GLdouble m[16], const GLdouble in[4])
{
#define M(row,col)  m[col*4+row]
    out[0] =
        M(0, 0) * in[0] + M(0, 1) * in[1] + M(0, 2) * in[2] + M(0, 3) * in[3];
    out[1] =
        M(1, 0) * in[0] + M(1, 1) * in[1] + M(1, 2) * in[2] + M(1, 3) * in[3];
    out[2] =
        M(2, 0) * in[0] + M(2, 1) * in[1] + M(2, 2) * in[2] + M(2, 3) * in[3];
    out[3] =
        M(3, 0) * in[0] + M(3, 1) * in[1] + M(3, 2) * in[2] + M(3, 3) * in[3];
#undef M
}

static inline GLint qgluProject(GLdouble objx, GLdouble objy, GLdouble objz,
           const GLdouble model[16], const GLdouble proj[16],
           const GLint viewport[4],
           GLdouble * winx, GLdouble * winy, GLdouble * winz)
{
   GLdouble in[4], out[4];

   in[0] = objx;
   in[1] = objy;
   in[2] = objz;
   in[3] = 1.0;
   transform_point(out, model, in);
   transform_point(in, proj, out);

   if (in[3] == 0.0)
      return GL_FALSE;

   in[0] /= in[3];
   in[1] /= in[3];
   in[2] /= in[3];

   *winx = viewport[0] + (1 + in[0]) * viewport[2] / 2;
   *winy = viewport[1] + (1 + in[1]) * viewport[3] / 2;

   *winz = (1 + in[2]) / 2;
   return GL_TRUE;
}

/*!
    Constructs a QGLFormat object with the factory default settings:
    \list
    \i \link setDoubleBuffer() Double buffer:\endlink Enabled.
    \i \link setDepth() Depth buffer:\endlink Enabled.
    \i \link setRgba() RGBA:\endlink Enabled (i.e., color index disabled).
    \i \link setAlpha() Alpha channel:\endlink Disabled.
    \i \link setAccum() Accumulator buffer:\endlink Disabled.
    \i \link setStencil() Stencil buffer:\endlink Disabled.
    \i \link setStereo() Stereo:\endlink Disabled.
    \i \link setDirectRendering() Direct rendering:\endlink Enabled.
    \i \link setOverlay() Overlay:\endlink Disabled.
    \i \link setPlane() Plane:\endlink 0 (i.e., normal plane).
    \i \link setSampleBuffers() Multisample buffers:\endlink Disabled.
    \endlist
*/

QGLFormat::QGLFormat()
{
    d = new QGLFormatPrivate;
}


/*!
    Creates a QGLFormat object that is a copy of the current \link
    defaultFormat() application default format\endlink.

    If \a options is not 0, this copy is modified by these format
    options. The \a options parameter should be \c FormatOption values
    OR'ed together.

    This constructor makes it easy to specify a certain desired format
    in classes derived from QGLWidget, for example:
    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 3

    Note that there are \c FormatOption values to turn format settings
    both on and off, e.g. \c DepthBuffer and \c NoDepthBuffer,
    \c DirectRendering and \c IndirectRendering, etc.

    The \a plane parameter defaults to 0 and is the plane which this
    format should be associated with. Not all OpenGL implementations
    supports overlay/underlay rendering planes.

    \sa defaultFormat(), setOption()
*/

QGLFormat::QGLFormat(QGL::FormatOptions options, int plane)
{
    d = new QGLFormatPrivate;
    QGL::FormatOptions newOpts = options;
    d->opts = defaultFormat().d->opts;
    d->opts |= (newOpts & 0xffff);
    d->opts &= ~(newOpts >> 16);
    d->pln = plane;
}

/*!
    Constructs a copy of \a other.
*/

QGLFormat::QGLFormat(const QGLFormat &other)
{
    d = new QGLFormatPrivate;
    *d = *other.d;
}

/*!
    Assigns \a other to this object.
*/

QGLFormat &QGLFormat::operator=(const QGLFormat &other)
{
    *d = *other.d;
    return *this;
}

/*!
    Destroys the QGLFormat.
*/
QGLFormat::~QGLFormat()
{
    delete d;
}

/*!
    \fn bool QGLFormat::doubleBuffer() const

    Returns true if double buffering is enabled; otherwise returns
    false. Double buffering is enabled by default.

    \sa setDoubleBuffer()
*/

/*!
    If \a enable is true sets double buffering; otherwise sets single
    buffering.

    Double buffering is enabled by default.

    Double buffering is a technique where graphics are rendered on an
    off-screen buffer and not directly to the screen. When the drawing
    has been completed, the program calls a swapBuffers() function to
    exchange the screen contents with the buffer. The result is
    flicker-free drawing and often better performance.

    \sa doubleBuffer(), QGLContext::swapBuffers(),
    QGLWidget::swapBuffers()
*/

void QGLFormat::setDoubleBuffer(bool enable)
{
    setOption(enable ? QGL::DoubleBuffer : QGL::SingleBuffer);
}


/*!
    \fn bool QGLFormat::depth() const

    Returns true if the depth buffer is enabled; otherwise returns
    false. The depth buffer is enabled by default.

    \sa setDepth(), setDepthBufferSize()
*/

/*!
    If \a enable is true enables the depth buffer; otherwise disables
    the depth buffer.

    The depth buffer is enabled by default.

    The purpose of a depth buffer (or Z-buffering) is to remove hidden
    surfaces. Pixels are assigned Z values based on the distance to
    the viewer. A pixel with a high Z value is closer to the viewer
    than a pixel with a low Z value. This information is used to
    decide whether to draw a pixel or not.

    \sa depth(), setDepthBufferSize()
*/

void QGLFormat::setDepth(bool enable)
{
    setOption(enable ? QGL::DepthBuffer : QGL::NoDepthBuffer);
}


/*!
    \fn bool QGLFormat::rgba() const

    Returns true if RGBA color mode is set. Returns false if color
    index mode is set. The default color mode is RGBA.

    \sa setRgba()
*/

/*!
    If \a enable is true sets RGBA mode. If \a enable is false sets
    color index mode.

    The default color mode is RGBA.

    RGBA is the preferred mode for most OpenGL applications. In RGBA
    color mode you specify colors as red + green + blue + alpha
    quadruplets.

    In color index mode you specify an index into a color lookup
    table.

    \sa rgba()
*/

void QGLFormat::setRgba(bool enable)
{
    setOption(enable ? QGL::Rgba : QGL::ColorIndex);
}


/*!
    \fn bool QGLFormat::alpha() const

    Returns true if the alpha buffer in the framebuffer is enabled;
    otherwise returns false. The alpha buffer is disabled by default.

    \sa setAlpha(), setAlphaBufferSize()
*/

/*!
    If \a enable is true enables the alpha buffer; otherwise disables
    the alpha buffer.

    The alpha buffer is disabled by default.

    The alpha buffer is typically used for implementing transparency
    or translucency. The A in RGBA specifies the transparency of a
    pixel.

    \sa alpha(), setAlphaBufferSize()
*/

void QGLFormat::setAlpha(bool enable)
{
    setOption(enable ? QGL::AlphaChannel : QGL::NoAlphaChannel);
}


/*!
    \fn bool QGLFormat::accum() const

    Returns true if the accumulation buffer is enabled; otherwise
    returns false. The accumulation buffer is disabled by default.

    \sa setAccum(), setAccumBufferSize()
*/

/*!
    If \a enable is true enables the accumulation buffer; otherwise
    disables the accumulation buffer.

    The accumulation buffer is disabled by default.

    The accumulation buffer is used to create blur effects and
    multiple exposures.

    \sa accum(), setAccumBufferSize()
*/

void QGLFormat::setAccum(bool enable)
{
    setOption(enable ? QGL::AccumBuffer : QGL::NoAccumBuffer);
}


/*!
    \fn bool QGLFormat::stencil() const

    Returns true if the stencil buffer is enabled; otherwise returns
    false. The stencil buffer is disabled by default.

    \sa setStencil(), setStencilBufferSize()
*/

/*!
    If \a enable is true enables the stencil buffer; otherwise
    disables the stencil buffer.

    The stencil buffer is disabled by default.

    The stencil buffer masks certain parts of the drawing area so that
    masked parts are not drawn on.

    \sa stencil(), setStencilBufferSize()
*/

void QGLFormat::setStencil(bool enable)
{
    setOption(enable ? QGL::StencilBuffer: QGL::NoStencilBuffer);
}


/*!
    \fn bool QGLFormat::stereo() const

    Returns true if stereo buffering is enabled; otherwise returns
    false. Stereo buffering is disabled by default.

    \sa setStereo()
*/

/*!
    If \a enable is true enables stereo buffering; otherwise disables
    stereo buffering.

    Stereo buffering is disabled by default.

    Stereo buffering provides extra color buffers to generate left-eye
    and right-eye images.

    \sa stereo()
*/

void QGLFormat::setStereo(bool enable)
{
    setOption(enable ? QGL::StereoBuffers : QGL::NoStereoBuffers);
}


/*!
    \fn bool QGLFormat::directRendering() const

    Returns true if direct rendering is enabled; otherwise returns
    false.

    Direct rendering is enabled by default.

    \sa setDirectRendering()
*/

/*!
    If \a enable is true enables direct rendering; otherwise disables
    direct rendering.

    Direct rendering is enabled by default.

    Enabling this option will make OpenGL bypass the underlying window
    system and render directly from hardware to the screen, if this is
    supported by the system.

    \sa directRendering()
*/

void QGLFormat::setDirectRendering(bool enable)
{
    setOption(enable ? QGL::DirectRendering : QGL::IndirectRendering);
}

/*!
    \fn bool QGLFormat::sampleBuffers() const

    Returns true if multisample buffer support is enabled; otherwise
    returns false.

    The multisample buffer is disabled by default.

    \sa setSampleBuffers()
*/

/*!
    If \a enable is true, a GL context with multisample buffer support
    is picked; otherwise ignored.

    \sa sampleBuffers(), setSamples(), samples()
*/
void QGLFormat::setSampleBuffers(bool enable)
{
    setOption(enable ? QGL::SampleBuffers : QGL::NoSampleBuffers);
}

/*!
    Returns the number of samples per pixel when multisampling is
    enabled. By default, the highest number of samples that is
    available is used.

    \sa setSampleBuffers(), sampleBuffers(), setSamples()
*/
int QGLFormat::samples() const
{
   return d->numSamples;
}

/*!
    Set the preferred number of samples per pixel when multisampling
    is enabled to \a numSamples. By default, the highest number of
    samples available is used.

    \sa setSampleBuffers(), sampleBuffers(), samples()
*/
void QGLFormat::setSamples(int numSamples)
{
    if (numSamples < 0) {
        qWarning("QGLFormat::setSamples: Cannot have negative number of samples per pixel %d", numSamples);
        return;
    }
    d->numSamples = numSamples;
}

/*!
    \since 4.2

    Set the preferred swap interval. This can be used to sync the GL
    drawing into a system window to the vertical refresh of the screen.
    Setting an \a interval value of 0 will turn the vertical refresh syncing
    off, any value higher than 0 will turn the vertical syncing on.

    Under Windows and under X11, where the \c{WGL_EXT_swap_control}
    and \c{GLX_SGI_video_sync} extensions are used, the \a interval
    parameter can be used to set the minimum number of video frames
    that are displayed before a buffer swap will occur. In effect,
    setting the \a interval to 10, means there will be 10 vertical
    retraces between every buffer swap.

    Under Windows the \c{WGL_EXT_swap_control} extension has to be present,
    and under X11 the \c{GLX_SGI_video_sync} extension has to be present.
*/
void QGLFormat::setSwapInterval(int interval)
{
    d->swapInterval = interval;
}

/*!
    \since 4.2

    Returns the currently set swap interval. -1 is returned if setting
    the swap interval isn't supported in the system GL implementation.
*/
int QGLFormat::swapInterval() const
{
    return d->swapInterval;
}

/*!
    \fn bool QGLFormat::hasOverlay() const

    Returns true if overlay plane is enabled; otherwise returns false.

    Overlay is disabled by default.

    \sa setOverlay()
*/

/*!
    If \a enable is true enables an overlay plane; otherwise disables
    the overlay plane.

    Enabling the overlay plane will cause QGLWidget to create an
    additional context in an overlay plane. See the QGLWidget
    documentation for further information.

    \sa hasOverlay()
*/

void QGLFormat::setOverlay(bool enable)
{
    setOption(enable ? QGL::HasOverlay : QGL::NoOverlay);
}

/*!
    Returns the plane of this format. The default for normal formats
    is 0, which means the normal plane. The default for overlay
    formats is 1, which is the first overlay plane.

    \sa setPlane()
*/
int QGLFormat::plane() const
{
    return d->pln;
}

/*!
    Sets the requested plane to \a plane. 0 is the normal plane, 1 is
    the first overlay plane, 2 is the second overlay plane, etc.; -1,
    -2, etc. are underlay planes.

    Note that in contrast to other format specifications, the plane
    specifications will be matched exactly. This means that if you
    specify a plane that the underlying OpenGL system cannot provide,
    an \link QGLWidget::isValid() invalid\endlink QGLWidget will be
    created.

    \sa plane()
*/
void QGLFormat::setPlane(int plane)
{
    d->pln = plane;
}

/*!
    Sets the format option to \a opt.

    \sa testOption()
*/

void QGLFormat::setOption(QGL::FormatOptions opt)
{
    if (opt & 0xffff)
        d->opts |= opt;
    else
       d->opts &= ~(opt >> 16);
}



/*!
    Returns true if format option \a opt is set; otherwise returns false.

    \sa setOption()
*/

bool QGLFormat::testOption(QGL::FormatOptions opt) const
{
    if (opt & 0xffff)
       return (d->opts & opt) != 0;
    else
       return (d->opts & (opt >> 16)) == 0;
}

/*!
    Set the minimum depth buffer size to \a size.

    \sa depthBufferSize(), setDepth(), depth()
*/
void QGLFormat::setDepthBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setDepthBufferSize: Cannot set negative depth buffer size %d", size);
        return;
    }
    d->depthSize = size;
}

/*!
    Returns the depth buffer size.

    \sa depth(), setDepth(), setDepthBufferSize()
*/
int QGLFormat::depthBufferSize() const
{
   return d->depthSize;
}

/*!
    \since 4.2

    Set the preferred red buffer size to \a size.

    \sa setGreenBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setRedBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setRedBufferSize: Cannot set negative red buffer size %d", size);
        return;
    }
    d->redSize = size;
}

/*!
    \since 4.2

    Returns the red buffer size.

    \sa setRedBufferSize()
*/
int QGLFormat::redBufferSize() const
{
   return d->redSize;
}

/*!
    \since 4.2

    Set the preferred green buffer size to \a size.

    \sa setRedBufferSize(), setBlueBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setGreenBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setGreenBufferSize: Cannot set negative green buffer size %d", size);
        return;
    }
    d->greenSize = size;
}

/*!
    \since 4.2

    Returns the green buffer size.

    \sa setGreenBufferSize()
*/
int QGLFormat::greenBufferSize() const
{
   return d->greenSize;
}

/*!
    \since 4.2

    Set the preferred blue buffer size to \a size.

    \sa setRedBufferSize(), setGreenBufferSize(), setAlphaBufferSize()
*/
void QGLFormat::setBlueBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setBlueBufferSize: Cannot set negative blue buffer size %d", size);
        return;
    }
    d->blueSize = size;
}

/*!
    \since 4.2

    Returns the blue buffer size.

    \sa setBlueBufferSize()
*/
int QGLFormat::blueBufferSize() const
{
   return d->blueSize;
}

/*!
    Set the preferred alpha buffer size to \a size.
    This function implicitly enables the alpha channel.

    \sa setRedBufferSize(), setGreenBufferSize(), alphaBufferSize()
*/
void QGLFormat::setAlphaBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setAlphaBufferSize: Cannot set negative alpha buffer size %d", size);
        return;
    }
    d->alphaSize = size;
    setOption(QGL::AlphaChannel);
}

/*!
    Returns the alpha buffer size.

    \sa alpha(), setAlpha(), setAlphaBufferSize()
*/
int QGLFormat::alphaBufferSize() const
{
   return d->alphaSize;
}

/*!
    Set the preferred accumulation buffer size, where \a size is the
    bit depth for each RGBA component.

    \sa accum(), setAccum(), accumBufferSize()
*/
void QGLFormat::setAccumBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setAccumBufferSize: Cannot set negative accumulate buffer size %d", size);
        return;
    }
    d->accumSize = size;
}

/*!
    Returns the accumulation buffer size.

    \sa setAccumBufferSize(), accum(), setAccum()
*/
int QGLFormat::accumBufferSize() const
{
   return d->accumSize;
}

/*!
    Set the preferred stencil buffer size to \a size.

    \sa stencilBufferSize(), setStencil(), stencil()
*/
void QGLFormat::setStencilBufferSize(int size)
{
    if (size < 0) {
        qWarning("QGLFormat::setStencilBufferSize: Cannot set negative stencil buffer size %d", size);
        return;
    }
    d->stencilSize = size;
}

/*!
    Returns the stencil buffer size.

    \sa stencil(), setStencil(), setStencilBufferSize()
*/
int QGLFormat::stencilBufferSize() const
{
   return d->stencilSize;
}

/*!
    \fn bool QGLFormat::hasOpenGL()

    Returns true if the window system has any OpenGL support;
    otherwise returns false.

    \warning This function must not be called until the QApplication
    object has been created.
*/



/*!
    \fn bool QGLFormat::hasOpenGLOverlays()

    Returns true if the window system supports OpenGL overlays;
    otherwise returns false.

    \warning This function must not be called until the QApplication
    object has been created.
*/

QGLFormat::OpenGLVersionFlags Q_AUTOTEST_EXPORT qOpenGLVersionFlagsFromString(const QString &versionString)
{
    QGLFormat::OpenGLVersionFlags versionFlags = QGLFormat::OpenGL_Version_None;

    if (versionString.startsWith(QLatin1String("OpenGL ES"))) {
        QStringList parts = versionString.split(QLatin1Char(' '));
        if (parts.size() >= 3) {
            if (parts[2].startsWith(QLatin1String("1."))) {
                if (parts[1].endsWith(QLatin1String("-CM"))) {
                    versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_0 |
                                    QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
                    if (parts[2].startsWith(QLatin1String("1.1")))
                        versionFlags |= QGLFormat::OpenGL_ES_Common_Version_1_1 |
                                        QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
                }
                else {
                    // Not -CM, must be CL, CommonLite
                    versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_0;
                    if (parts[2].startsWith(QLatin1String("1.1")))
                        versionFlags |= QGLFormat::OpenGL_ES_CommonLite_Version_1_1;
                }
            }
            else {
                // OpenGL ES version 2.0 or higher
                versionFlags |= QGLFormat::OpenGL_ES_Version_2_0;
            }
        }
        else {
            // if < 3 parts to the name, it is an unrecognised OpenGL ES
            qWarning("Unrecognised OpenGL ES version");
        }
    }
    else {
        // not ES, regular OpenGL, the version numbers are first in the string
        if (versionString.startsWith(QLatin1String("1."))) {
            switch (versionString[2].toAscii()) {
            case '5':
                versionFlags |= QGLFormat::OpenGL_Version_1_5;
            case '4':
                versionFlags |= QGLFormat::OpenGL_Version_1_4;
            case '3':
                versionFlags |= QGLFormat::OpenGL_Version_1_3;
            case '2':
                versionFlags |= QGLFormat::OpenGL_Version_1_2;
            case '1':
                versionFlags |= QGLFormat::OpenGL_Version_1_1;
            default:
                break;
            }
        }
        else if (versionString.startsWith(QLatin1String("2."))) {
            versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                            QGLFormat::OpenGL_Version_1_2 |
                            QGLFormat::OpenGL_Version_1_3 |
                            QGLFormat::OpenGL_Version_1_4 |
                            QGLFormat::OpenGL_Version_1_5 |
                            QGLFormat::OpenGL_Version_2_0;
            QString minorVersion = versionString.section(QLatin1Char(' '), 0, 0).section(QLatin1Char('.'), 1, 1);
            if (minorVersion == QChar(QLatin1Char('1')))
                versionFlags |= QGLFormat::OpenGL_Version_2_1;
        }
        else if (versionString.startsWith(QLatin1String("3."))) {
         versionFlags |= QGLFormat::OpenGL_Version_1_1 |
                         QGLFormat::OpenGL_Version_1_2 |
                         QGLFormat::OpenGL_Version_1_3 |
                         QGLFormat::OpenGL_Version_1_4 |
                         QGLFormat::OpenGL_Version_1_5 |
                         QGLFormat::OpenGL_Version_2_0 |
                         QGLFormat::OpenGL_Version_2_1 |
                         QGLFormat::OpenGL_Version_3_0;
        }
        else
            qWarning("Unrecognised OpenGL version");
    }
    return versionFlags;
}

/*!
    \enum QGLFormat::OpenGLVersionFlag
    \since 4.2

    This enum describes the various OpenGL versions that are
    recognized by Qt. Use the QGLFormat::openGLVersionFlags() function
    to identify which versions that are supported at runtime.

    \value OpenGL_Version_None  If no OpenGL is present or if no OpenGL context is current.

    \value OpenGL_Version_1_1  OpenGL version 1.1 or higher is present.

    \value OpenGL_Version_1_2  OpenGL version 1.2 or higher is present.

    \value OpenGL_Version_1_3  OpenGL version 1.3 or higher is present.

    \value OpenGL_Version_1_4  OpenGL version 1.4 or higher is present.

    \value OpenGL_Version_1_5  OpenGL version 1.5 or higher is present.

    \value OpenGL_Version_2_0  OpenGL version 2.0 or higher is present.
    Note that version 2.0 supports all the functionality of version 1.5.

    \value OpenGL_Version_2_1  OpenGL version 2.1 or higher is present.

    \value OpenGL_Version_3_0  OpenGL version 3.0 or higher is present.

    \value OpenGL_ES_CommonLite_Version_1_0  OpenGL ES version 1.0 Common Lite or higher is present.

    \value OpenGL_ES_Common_Version_1_0  OpenGL ES version 1.0 Common or higher is present.
    The Common profile supports all the features of Common Lite.

    \value OpenGL_ES_CommonLite_Version_1_1  OpenGL ES version 1.1 Common Lite or higher is present.

    \value OpenGL_ES_Common_Version_1_1  OpenGL ES version 1.1 Common or higher is present.
    The Common profile supports all the features of Common Lite.

    \value OpenGL_ES_Version_2_0  OpenGL ES version 2.0 or higher is present.
    Note that OpenGL ES version 2.0 does not support all the features of OpenGL ES 1.x.
    So if OpenGL_ES_Version_2_0 is returned, none of the ES 1.x flags are returned.

    See also \l{http://www.opengl.org} for more information about the different
    revisions of OpenGL.

    \sa openGLVersionFlags()
*/

/*!
    \since 4.2

    Identifies, at runtime, which OpenGL versions that are supported
    by the current platform.

    Note that if OpenGL version 1.5 is supported, its predecessors
    (i.e., version 1.4 and lower) are also supported. To identify the
    support of a particular feature, like multi texturing, test for
    the version in which the feature was first introduced (i.e.,
    version 1.3 in the case of multi texturing) to adapt to the largest
    possible group of runtime platforms.

    This function needs a valid current OpenGL context to work;
    otherwise it will return OpenGL_Version_None.

    \sa hasOpenGL(), hasOpenGLOverlays()
*/
QGLFormat::OpenGLVersionFlags QGLFormat::openGLVersionFlags()
{
    static bool cachedDefault = false;
    static OpenGLVersionFlags defaultVersionFlags = OpenGL_Version_None;
    QGLContext *currentCtx = const_cast<QGLContext *>(QGLContext::currentContext());
    QGLWidget *dummy = 0;

    if (currentCtx && currentCtx->d_func()->version_flags_cached)
        return currentCtx->d_func()->version_flags;

    if (!currentCtx) {
        if (cachedDefault) {
            return defaultVersionFlags;
        } else {
            cachedDefault = true;
            if (!hasOpenGL())
                return defaultVersionFlags;
            dummy = new QGLWidget;
            dummy->makeCurrent(); // glGetString() needs a current context
        }
    }

    QString versionString(QLatin1String(reinterpret_cast<const char*>(glGetString(GL_VERSION))));
    OpenGLVersionFlags versionFlags = qOpenGLVersionFlagsFromString(versionString);
    if (currentCtx) {
        currentCtx->d_func()->version_flags_cached = true;
        currentCtx->d_func()->version_flags = versionFlags;
    }
    if (dummy) {
        defaultVersionFlags = versionFlags;
        delete dummy;
    }

    return versionFlags;
}


/*!
    Returns the default QGLFormat for the application. All QGLWidgets
    that are created use this format unless another format is
    specified, e.g. when they are constructed.

    If no special default format has been set using
    setDefaultFormat(), the default format is the same as that created
    with QGLFormat().

    \sa setDefaultFormat()
*/

QGLFormat QGLFormat::defaultFormat()
{
    return *qgl_default_format();
}

/*!
    Sets a new default QGLFormat for the application to \a f. For
    example, to set single buffering as the default instead of double
    buffering, your main() might contain code like this:
    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 4

    \sa defaultFormat()
*/

void QGLFormat::setDefaultFormat(const QGLFormat &f)
{
    *qgl_default_format() = f;
}


/*!
    Returns the default QGLFormat for overlay contexts.

    The factory default overlay format is:
    \list
    \i \link setDoubleBuffer() Double buffer:\endlink Disabled.
    \i \link setDepth() Depth buffer:\endlink Disabled.
    \i \link setRgba() RGBA:\endlink Disabled (i.e., color index enabled).
    \i \link setAlpha() Alpha channel:\endlink Disabled.
    \i \link setAccum() Accumulator buffer:\endlink Disabled.
    \i \link setStencil() Stencil buffer:\endlink Disabled.
    \i \link setStereo() Stereo:\endlink Disabled.
    \i \link setDirectRendering() Direct rendering:\endlink Enabled.
    \i \link setOverlay() Overlay:\endlink Disabled.
    \i \link setPlane() Plane:\endlink 1 (i.e., first overlay plane).
    \endlist

    \sa setDefaultFormat()
*/

QGLFormat QGLFormat::defaultOverlayFormat()
{
    return *defaultOverlayFormatInstance();
}

/*!
    Sets a new default QGLFormat for overlay contexts to \a f. This
    format is used whenever a QGLWidget is created with a format that
    hasOverlay() enabled.

    For example, to get a double buffered overlay context (if
    available), use code like this:

    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 5

    As usual, you can find out after widget creation whether the
    underlying OpenGL system was able to provide the requested
    specification:

    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 6

    \sa defaultOverlayFormat()
*/

void QGLFormat::setDefaultOverlayFormat(const QGLFormat &f)
{
    QGLFormat *defaultFormat = defaultOverlayFormatInstance();
    *defaultFormat = f;
    // Make sure the user doesn't request that the overlays themselves
    // have overlays, since it is unlikely that the system supports
    // infinitely many planes...
    defaultFormat->setOverlay(false);
}


/*!
    Returns true if all the options of the two QGLFormats are equal;
    otherwise returns false.
*/

bool operator==(const QGLFormat& a, const QGLFormat& b)
{
    return (int) a.d->opts == (int) b.d->opts && a.d->pln == b.d->pln && a.d->alphaSize == b.d->alphaSize
        && a.d->accumSize == b.d->accumSize && a.d->stencilSize == b.d->stencilSize
        && a.d->depthSize == b.d->depthSize;
}


/*!
    Returns false if all the options of the two QGLFormats are equal;
    otherwise returns true.
*/

bool operator!=(const QGLFormat& a, const QGLFormat& b)
{
    return !(a == b);
}

/*****************************************************************************
  QGLContext implementation
 *****************************************************************************/
void QGLContextPrivate::init(QPaintDevice *dev, const QGLFormat &format)
{
    Q_Q(QGLContext);
    glFormat = reqFormat = format;
    valid = false;
    q->setDevice(dev);
#if defined(Q_WS_X11)
    pbuf = 0;
    gpm = 0;
    vi = 0;
    screen = QX11Info::appScreen();
#endif
#if defined(Q_WS_WIN)
    dc = 0;
    win = 0;
    pixelFormatId = 0;
    cmap = 0;
    hbitmap = 0;
    hbitmap_hdc = 0;
#endif
#if defined(Q_WS_MAC)
#  ifndef QT_MAC_USE_COCOA
    update = false;
#  endif
    vi = 0;
#endif
#if defined(QT_OPENGL_ES)
    eglContext = 0;
#endif
    pbo = 0;
    fbo = 0;
    crWin = false;
    initDone = false;
    sharing = false;
    clear_on_painter_begin = true;
    max_texture_size = -1;
    version_flags_cached = false;
    version_flags = QGLFormat::OpenGL_Version_None;
    current_fbo = 0;
    active_engine = 0;
}

QGLContext* QGLContext::currentCtx = 0;

/*
   Read back the contents of the currently bound framebuffer, used in
   QGLWidget::grabFrameBuffer(), QGLPixelbuffer::toImage() and
   QGLFramebufferObject::toImage()
*/

static void convertFromGLImage(QImage &img, int w, int h, bool alpha_format, bool include_alpha)
{
    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
        // OpenGL gives RGBA; Qt wants ARGB
        uint *p = (uint*)img.bits();
        uint *end = p + w*h;
        if (alpha_format && include_alpha) {
            while (p < end) {
                uint a = *p << 24;
                *p = (*p >> 8) | a;
                p++;
            }
        } else {
            // This is an old legacy fix for PowerPC based Macs, which
            // we shouldn't remove
            while (p < end) {
                *p = 0xff000000 | (*p>>8);
                ++p;
            }
        }
    } else {
        // OpenGL gives ABGR (i.e. RGBA backwards); Qt wants ARGB
        for (int y = 0; y < h; y++) {
            uint *q = (uint*)img.scanLine(y);
            for (int x=0; x < w; ++x) {
                const uint pixel = *q;
                *q = ((pixel << 16) & 0xff0000) | ((pixel >> 16) & 0xff) | (pixel & 0xff00ff00);
                q++;
            }
        }

    }
    img = img.mirrored();
}

QImage qt_gl_read_framebuffer(const QSize &size, bool alpha_format, bool include_alpha)
{
    QImage img(size, alpha_format ? QImage::Format_ARGB32 : QImage::Format_RGB32);
    int w = size.width();
    int h = size.height();
    glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
    convertFromGLImage(img, w, h, alpha_format, include_alpha);
    return img;
}

QImage qt_gl_read_texture(const QSize &size, bool alpha_format, bool include_alpha)
{
    QImage img(size, alpha_format ? QImage::Format_ARGB32 : QImage::Format_RGB32);
    int w = size.width();
    int h = size.height();
#if !defined(QT_OPENGL_ES_2) && !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    //### glGetTexImage not in GL ES 2.0, need to do something else here!
    glGetTexImage(GL_TEXTURE_2D, 0, GL_RGBA, GL_UNSIGNED_BYTE, img.bits());
#endif
    convertFromGLImage(img, w, h, alpha_format, include_alpha);
    return img;
}

// returns the highest number closest to v, which is a power of 2
// NB! assumes 32 bit ints
int qt_next_power_of_two(int v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    ++v;
    return v;
}

class QGLTexture {
public:
    QGLTexture(const QGLContext *ctx, GLuint tx_id, GLenum tx_target, bool _clean = false)
        : context(ctx), id(tx_id), target(tx_target), clean(_clean) {}
    ~QGLTexture() {
        if (clean) {
            QGLContext *current = const_cast<QGLContext *>(QGLContext::currentContext());
            QGLContext *ctx = const_cast<QGLContext *>(context);
            bool switch_context = current && current != ctx && !qgl_share_reg()->checkSharing(current, ctx);
            if (switch_context)
                ctx->makeCurrent();
            glDeleteTextures(1, &id);
            if (switch_context)
                current->makeCurrent();
        }
     }

    const QGLContext *context;
    GLuint id;
    GLenum target;
    bool clean;
};

typedef QCache<qint64, QGLTexture> QGLTextureCache;
static int qt_tex_cache_limit = 64*1024; // cache ~64 MB worth of textures - this is not accurate though
static QGLTextureCache *qt_tex_cache = 0;

typedef void (*_qt_pixmap_cleanup_hook_64)(qint64);
typedef void (*_qt_image_cleanup_hook_64)(qint64);

extern Q_GUI_EXPORT _qt_pixmap_cleanup_hook_64 qt_pixmap_cleanup_hook_64;
extern Q_GUI_EXPORT _qt_image_cleanup_hook_64 qt_image_cleanup_hook_64;

// DDS format structure
struct DDSFormat {
    quint32 dwSize;
    quint32 dwFlags;
    quint32 dwHeight;
    quint32 dwWidth;
    quint32 dwLinearSize;
    quint32 dummy1;
    quint32 dwMipMapCount;
    quint32 dummy2[11];
    struct {
        quint32 dummy3[2];
        quint32 dwFourCC;
        quint32 dummy4[5];
    } ddsPixelFormat;
};

// compressed texture pixel formats
#define FOURCC_DXT1  0x31545844
#define FOURCC_DXT2  0x32545844
#define FOURCC_DXT3  0x33545844
#define FOURCC_DXT4  0x34545844
#define FOURCC_DXT5  0x35545844

#ifndef GL_COMPRESSED_RGB_S3TC_DXT1_EXT
#define GL_COMPRESSED_RGB_S3TC_DXT1_EXT   0x83F0
#define GL_COMPRESSED_RGBA_S3TC_DXT1_EXT  0x83F1
#define GL_COMPRESSED_RGBA_S3TC_DXT3_EXT  0x83F2
#define GL_COMPRESSED_RGBA_S3TC_DXT5_EXT  0x83F3
#endif

#ifndef GL_GENERATE_MIPMAP_SGIS
#define GL_GENERATE_MIPMAP_SGIS       0x8191
#define GL_GENERATE_MIPMAP_HINT_SGIS  0x8192
#endif

Q_GLOBAL_STATIC(QGLShareRegister, _qgl_share_reg)
Q_OPENGL_EXPORT QGLShareRegister* qgl_share_reg()
{
    return _qgl_share_reg();
}

/*!
    \class QGLContext
    \brief The QGLContext class encapsulates an OpenGL rendering context.

    \ingroup multimedia

    An OpenGL rendering context is a complete set of OpenGL state
    variables. The rendering context's \l {QGL::FormatOption} {format}
    is set in the constructor, but it can also be set later with
    setFormat(). The format options that are actually set are returned
    by format(); the options you asked for are returned by
    requestedFormat(). Note that after a QGLContext object has been
    constructed, the actual OpenGL context must be created by
    explicitly calling the \link create() create()\endlink
    function. The makeCurrent() function makes this context the
    current rendering context. You can make \e no context current
    using doneCurrent(). The reset() function will reset the context
    and make it invalid.

    You can examine properties of the context with, e.g. isValid(),
    isSharing(), initialized(), windowCreated() and
    overlayTransparentColor().

    If you're using double buffering you can swap the screen contents
    with the off-screen buffer using swapBuffers().

    Please note that QGLContext is not thread safe.
*/


/*!
    \obsolete

    Constructs an OpenGL context for the given paint \a device, which
    can be a widget or a pixmap. The \a format specifies several
    display options for the context.

    If the underlying OpenGL/Window system cannot satisfy all the
    features requested in \a format, the nearest subset of features
    will be used. After creation, the format() method will return the
    actual format obtained.

    Note that after a QGLContext object has been constructed, \l
    create() must be called explicitly to create the actual OpenGL
    context. The context will be \l {isValid()}{invalid} if it was not
    possible to obtain a GL context at all.
*/

QGLContext::QGLContext(const QGLFormat &format, QPaintDevice *device)
    : d_ptr(new QGLContextPrivate(this))
{
    Q_D(QGLContext);
    d->init(device, format);
}

/*!
    Constructs an OpenGL context with the given \a format which
    specifies several display options for the context.

    If the underlying OpenGL/Window system cannot satisfy all the
    features requested in \a format, the nearest subset of features
    will be used. After creation, the format() method will return the
    actual format obtained.

    Note that after a QGLContext object has been constructed, \l
    create() must be called explicitly to create the actual OpenGL
    context. The context will be \l {isValid()}{invalid} if it was not
    possible to obtain a GL context at all.

    \sa format(), isValid()
*/
QGLContext::QGLContext(const QGLFormat &format)
    : d_ptr(new QGLContextPrivate(this))
{
    Q_D(QGLContext);
    d->init(0, format);
}

/*!
    Destroys the OpenGL context and frees its resources.
*/

QGLContext::~QGLContext()
{
    Q_D(QGLContext);
    // remove any textures cached in this context
    if (qt_tex_cache) {
        QList<qint64> keys = qt_tex_cache->keys();
        for (int i = 0; i < keys.size(); ++i) {
            const qint64 &key = keys.at(i);
            if (qt_tex_cache->object(key)->context == this)
                qt_tex_cache->remove(key);
        }
        // ### thread safety
        if (qt_tex_cache->size() == 0) {
            qt_pixmap_cleanup_hook_64 = 0;
            qt_image_cleanup_hook_64 = 0;
            delete qt_tex_cache;
            qt_tex_cache = 0;
        }
    }

    QGLSignalProxy::instance()->emitAboutToDestroyContext(this);
    reset();
}

void QGLContextPrivate::cleanup()
{
    Q_Q(QGLContext);
    if (pbo) {
        QGLContext *ctx = q;
        glDeleteBuffers(1, &pbo);
        pbo = 0;
    }
}

typedef QHash<QString, GLuint> QGLDDSCache;
Q_GLOBAL_STATIC(QGLDDSCache, qgl_dds_cache)

/*!
    \overload

    Reads the DirectDrawSurface (DDS) compressed file \a fileName and
    generates a 2D GL texture from it.

    Only the DXT1, DXT3 and DXT5 DDS formats are supported.

    Note that this will only work if the implementation supports the
    \c GL_ARB_texture_compression and \c GL_EXT_texture_compression_s3tc
    extensions.

    \sa deleteTexture()
*/

GLuint QGLContext::bindTexture(const QString &fileName)
{
    if (!qt_glCompressedTexImage2DARB) {
        qWarning("QGLContext::bindTexture(): The GL implementation does not support texture"
                 "compression extensions.");
        return 0;
    }

    QGLDDSCache::const_iterator it = qgl_dds_cache()->constFind(fileName);
    if (it != qgl_dds_cache()->constEnd()) {
        glBindTexture(GL_TEXTURE_2D, it.value());
        return it.value();
    }

    QFile f(fileName);
    f.open(QIODevice::ReadOnly);

    char tag[4];
    f.read(&tag[0], 4);
    if (strncmp(tag,"DDS ", 4) != 0) {
        qWarning("QGLContext::bindTexture(): not a DDS image file.");
        return 0;
    }

    DDSFormat ddsHeader;
    f.read((char *) &ddsHeader, sizeof(DDSFormat));

    if (!ddsHeader.dwLinearSize) {
        qWarning("QGLContext::bindTexture() DDS image size is not valid.");
        return 0;
    }

    int factor = 4;
    int bufferSize = 0;
    int blockSize = 16;
    GLenum format;

    switch(ddsHeader.ddsPixelFormat.dwFourCC) {
    case FOURCC_DXT1:
        format = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
        factor = 2;
        blockSize = 8;
        break;
    case FOURCC_DXT3:
        format = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
        break;
    case FOURCC_DXT5:
        format = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
        break;
    default:
        qWarning("QGLContext::bindTexture() DDS image format not supported.");
        return 0;
    }

    if (ddsHeader.dwMipMapCount > 1)
        bufferSize = ddsHeader.dwLinearSize * factor;
    else
        bufferSize = ddsHeader.dwLinearSize;

    GLubyte *pixels = (GLubyte *) malloc(bufferSize*sizeof(GLubyte));
    f.seek(ddsHeader.dwSize + 4);
    f.read((char *) pixels, bufferSize);
    f.close();

    GLuint tx_id;
    glGenTextures(1, &tx_id);
    glBindTexture(GL_TEXTURE_2D, tx_id);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    int size;
    int offset = 0;
    int w = ddsHeader.dwWidth;
    int h = ddsHeader.dwHeight;

    // load mip-maps
    for(int i = 0; i < (int) ddsHeader.dwMipMapCount; ++i) {
        if (w == 0) w = 1;
        if (h == 0) h = 1;

        size = ((w+3)/4) * ((h+3)/4) * blockSize;
        qt_glCompressedTexImage2DARB(GL_TEXTURE_2D, i, format, w, h, 0,
                                     size, pixels + offset);
        offset += size;

        // half size for each mip-map level
        w = w/2;
        h = h/2;
    }

    free(pixels);

    qgl_dds_cache()->insert(fileName, tx_id);
    return tx_id;
}

/*
  a hook that removes textures from the cache when a pixmap/image
  is deref'ed
*/
static void qt_gl_clean_cache(qint64 cacheKey)
{
    // ### remove when the GL texture cache becomes thread-safe
    if (qApp->thread() != QThread::currentThread())
        return;
    if (qt_tex_cache) {
        QGLTexture *texture = qt_tex_cache->object(cacheKey);
        if (texture && texture->clean)
            qt_tex_cache->remove(cacheKey);
    }
}

static void convertToGLFormatHelper(QImage &dst, const QImage &img, GLenum texture_format)
{
    Q_ASSERT(dst.depth() == 32);
    Q_ASSERT(img.depth() == 32);

    if (dst.size() != img.size()) {
        int target_width = dst.width();
        int target_height = dst.height();
        qreal sx = target_width / qreal(img.width());
        qreal sy = target_height / qreal(img.height());

        quint32 *dest = (quint32 *) dst.scanLine(0); // NB! avoid detach here
        uchar *srcPixels = (uchar *) img.scanLine(img.height() - 1);
        int sbpl = img.bytesPerLine();
        int dbpl = dst.bytesPerLine();

        int ix = 0x00010000 / sx;
        int iy = 0x00010000 / sy;

        quint32 basex = int(0.5 * ix);
        quint32 srcy = int(0.5 * iy);

        // scale, swizzle and mirror in one loop
        while (target_height--) {
            const uint *src = (const quint32 *) (srcPixels - (srcy >> 16) * sbpl);
            int srcx = basex;
            for (int x=0; x<target_width; ++x) {
                uint src_pixel = src[srcx >> 16];
                if (texture_format == GL_BGRA) {
                    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
                        dest[x] = ((src_pixel << 24) & 0xff000000)
                                  | ((src_pixel >> 24) & 0x000000ff)
                                  | ((src_pixel << 8) & 0x00ff0000)
                                  | ((src_pixel >> 8) & 0x0000ff00);
                    } else {
                        dest[x] = src_pixel;
                    }
                } else {  // GL_RGBA
                    if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
                        dest[x] = (src_pixel << 8) | ((src_pixel >> 24) & 0xff);
                    } else {
                        dest[x] = ((src_pixel << 16) & 0xff0000)
                                  | ((src_pixel >> 16) & 0xff)
                                  | (src_pixel & 0xff00ff00);
                    }
                }
                srcx += ix;
            }
            dest = (quint32 *)(((uchar *) dest) + dbpl);
            srcy += iy;
        }
    } else {
        const int width = img.width();
        const int height = img.height();
        const uint *p = (const uint*) img.scanLine(img.height() - 1);
        uint *q = (uint*) dst.scanLine(0);

        if (texture_format == GL_BGRA) {
            if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
                // mirror + swizzle
                for (int i=0; i < height; ++i) {
                    const uint *end = p + width;
                    while (p < end) {
                        *q = ((*p << 24) & 0xff000000)
                             | ((*p >> 24) & 0x000000ff)
                             | ((*p << 8) & 0x00ff0000)
                             | ((*p >> 8) & 0x0000ff00);
                        p++;
                        q++;
                    }
                    p -= 2 * width;
                }
            } else {
                const uint bytesPerLine = img.bytesPerLine();
                for (int i=0; i < height; ++i) {
                    memcpy(q, p, bytesPerLine);
                    q += width;
                    p -= width;
                }
            }
        } else {
            if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
                for (int i=0; i < height; ++i) {
                    const uint *end = p + width;
                    while (p < end) {
                        *q = (*p << 8) | ((*p >> 24) & 0xff);
                        p++;
                        q++;
                    }
                    p -= 2 * width;
                }
            } else {
                for (int i=0; i < height; ++i) {
                    const uint *end = p + width;
                    while (p < end) {
                        *q = ((*p << 16) & 0xff0000) | ((*p >> 16) & 0xff) | (*p & 0xff00ff00);
                        p++;
                        q++;
                    }
                    p -= 2 * width;
                }
            }
        }
    }
}

QImage QGLContextPrivate::convertToGLFormat(const QImage &image, bool force_premul,
                                            GLenum texture_format)
{
    QImage::Format target_format = image.format();
    if (force_premul || image.format() != QImage::Format_ARGB32)
        target_format = QImage::Format_ARGB32_Premultiplied;

    QImage result(image.width(), image.height(), target_format);
    convertToGLFormatHelper(result, image.convertToFormat(target_format), texture_format);
    return result;
}

GLuint QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint format,
                                      const qint64 key, bool clean)
{
    Q_Q(QGLContext);

    QGLContext *ctx = q;

    bool use_pbo = false;
    if (QGLExtensions::glExtensions & QGLExtensions::PixelBufferObject) {

        use_pbo = qt_resolve_buffer_extensions(ctx);
        if (use_pbo && pbo == 0)
            glGenBuffers(1, &pbo);
    }

    // the GL_BGRA format is only present in GL version >= 1.2
    GLenum texture_format = (QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_1_2)
                            ? GL_BGRA : GL_RGBA;
    if (!qt_tex_cache) {
        qt_tex_cache = new QGLTextureCache(qt_tex_cache_limit);
        qt_pixmap_cleanup_hook_64 = qt_gl_clean_cache;
        qt_image_cleanup_hook_64 = qt_gl_clean_cache;
    }

    // Scale the pixmap if needed. GL textures needs to have the
    // dimensions 2^n+2(border) x 2^m+2(border), unless we're using GL
    // 2.0 or use the GL_TEXTURE_RECTANGLE texture target
    int tx_w = qt_next_power_of_two(image.width());
    int tx_h = qt_next_power_of_two(image.height());
    bool scale = false;

    QImage img = image;
    if (( !(QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_Version_2_0) &&
          !(QGLFormat::openGLVersionFlags() & QGLFormat::OpenGL_ES_Version_2_0) )
        && (target == GL_TEXTURE_2D && (tx_w != image.width() || tx_h != image.height())))
    {
        scale = true;
    }

    GLuint tx_id;
    glGenTextures(1, &tx_id);
    glBindTexture(target, tx_id);
    glTexParameterf(target, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    if (glFormat.directRendering()
        && QGLExtensions::glExtensions & QGLExtensions::GenerateMipmap
        && target == GL_TEXTURE_2D && !clean)
    {
        glHint(GL_GENERATE_MIPMAP_HINT_SGIS, GL_NICEST);
#ifndef QT_OPENGL_ES
        glTexParameteri(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
#else
        glTexParameterf(target, GL_GENERATE_MIPMAP_SGIS, GL_TRUE);
#endif
        glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);

        // Mipmap generation causes huge slowdown with PBO's for some reason
        use_pbo = false;
    } else {
        glTexParameterf(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    }

    uchar *ptr = 0;
    if (use_pbo) {
        glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, pbo);
        glBufferData(GL_PIXEL_UNPACK_BUFFER_ARB, img.width() * img.height() * 4, 0, GL_STREAM_DRAW_ARB);
        ptr = reinterpret_cast<uchar *>(glMapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB, GL_WRITE_ONLY_ARB));
    }

    QImage::Format target_format = img.format();
    // Note: the clean param is only true when a texture is bound
    // from the QOpenGLPaintEngine - in that case we have to force
    // a premultiplied texture format
    if (clean || img.format() != QImage::Format_ARGB32)
        target_format = QImage::Format_ARGB32_Premultiplied;
    if (img.format() != target_format)
        img = img.convertToFormat(target_format);

    if (ptr) {
        QImage buffer(ptr, img.width(), img.height(), target_format);
        convertToGLFormatHelper(buffer, img, texture_format);
        glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_ARB);
        glTexImage2D(target, 0, format, img.width(), img.height(), 0, texture_format,
                     GL_UNSIGNED_BYTE, 0);
    } else {
        QImage tx(scale ? QSize(tx_w, tx_h) : img.size(), target_format);
        convertToGLFormatHelper(tx, img, texture_format);
        glTexImage2D(target, 0, format, tx.width(), tx.height(), 0, texture_format,
                     GL_UNSIGNED_BYTE, tx.bits());
    }

    if (use_pbo)
        glBindBuffer(GL_PIXEL_UNPACK_BUFFER_ARB, 0);

    // this assumes the size of a texture is always smaller than the max cache size
    int cost = img.width()*img.height()*4/1024;
    if (qt_tex_cache->totalCost() + cost > qt_tex_cache->maxCost()) {
        // the cache is full - make an attempt to remove something
        const QList<qint64> keys = qt_tex_cache->keys();
        int i = 0;
        while (i < qt_tex_cache->count()
               && (qt_tex_cache->totalCost() + cost > qt_tex_cache->maxCost())) {
            QGLTexture *tex = qt_tex_cache->object(keys.at(i));
            if (tex->context == q)
                qt_tex_cache->remove(keys.at(i));
            ++i;
        }
    }
    qt_tex_cache->insert(key, new QGLTexture(q, tx_id, target, clean), cost);
    return tx_id;
}

bool QGLContextPrivate::textureCacheLookup(const qint64 key, GLenum target, GLuint *id)
{
    Q_Q(QGLContext);
    if (qt_tex_cache) {
        QGLTexture *texture = qt_tex_cache->object(key);
        if (texture && texture->target == target
            && (texture->context == q || qgl_share_reg()->checkSharing(q, texture->context)))
        {
            *id = texture->id;
            return true;
        }
    }
    return false;
}

/*! \internal */
GLuint QGLContextPrivate::bindTexture(const QImage &image, GLenum target, GLint format, bool clean)
{
    const qint64 key = image.cacheKey();
    GLuint id;
    if (textureCacheLookup(key, target, &id)) {
        glBindTexture(target, id);
        return id;
    }
    GLuint cached = bindTexture(image, target, format, key, clean);
    const_cast<QImage &>(image).data_ptr()->is_cached = (cached > 0);
    return cached;
}

/*! \internal */
GLuint QGLContextPrivate::bindTexture(const QPixmap &pixmap, GLenum target, GLint format, bool clean)
{
    Q_Q(QGLContext);
    QPixmapData *pd = pixmap.pixmapData();
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    if (target == GL_TEXTURE_2D && pd->classId() == QPixmapData::OpenGLClass) {
        const QGLPixmapData *data = static_cast<const QGLPixmapData *>(pd);

        if (data->isValidContext(q))
            return data->bind();
    }
#endif

    const qint64 key = pixmap.cacheKey();
    GLuint id;
    if (textureCacheLookup(key, target, &id)) {
        glBindTexture(target, id);
        return id;
    }
    GLuint cached = bindTexture(pixmap.toImage(), target, format, key, clean);
    const_cast<QPixmap &>(pixmap).data_ptr()->is_cached = (cached > 0);
    return cached;
}

/*! \internal */
int QGLContextPrivate::maxTextureSize()
{
    if (max_texture_size != -1)
        return max_texture_size;

    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &max_texture_size);

#if defined(QT_OPENGL_ES)
    return max_texture_size;
#else
    GLenum proxy = GL_PROXY_TEXTURE_2D;

    GLint size;
    GLint next = 64;
    glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
    glGetTexLevelParameteriv(proxy, 0, GL_TEXTURE_WIDTH, &size);
    if (size == 0) {
        return max_texture_size;
    }
    do {
        size = next;
        next = size * 2;

        if (next > max_texture_size)
            break;
        glTexImage2D(proxy, 0, GL_RGBA, next, next, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
        glGetTexLevelParameteriv(proxy, 0, GL_TEXTURE_WIDTH, &next);
    } while (next > size);

    max_texture_size = size;
    return max_texture_size;
#endif
}

/*!
    Generates and binds a 2D GL texture to the current context, based
    on \a image. The generated texture id is returned and can be used
    in later \c glBindTexture() calls.

    The \a target parameter specifies the texture target. The default
    target is \c GL_TEXTURE_2D.

    The \a format parameter sets the internal format for the
    texture. The default format is \c GL_RGBA8.

    If the GL implementation supports the \c GL_SGIS_generate_mipmap
    extension, mipmaps will be automatically generated for the
    texture. Mipmap generation is only supported for the \c
    GL_TEXTURE_2D target.

    The texture that is generated is cached, so multiple calls to
    bindTexture() with the same QImage will return the same texture
    id.

    Note that we assume default values for the glPixelStore() and
    glPixelTransfer() parameters.

    \sa deleteTexture()
*/
GLuint QGLContext::bindTexture(const QImage &image, GLenum target, GLint format)
{
    Q_D(QGLContext);
    return d->bindTexture(image, target, format, false);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
GLuint QGLContext::bindTexture(const QImage &image, QMacCompatGLenum target, QMacCompatGLint format)
{
    Q_D(QGLContext);
    return d->bindTexture(image, GLenum(target), GLint(format), false);
}
#endif

/*! \overload

    Generates and binds a 2D GL texture based on \a pixmap.
*/
GLuint QGLContext::bindTexture(const QPixmap &pixmap, GLenum target, GLint format)
{
    Q_D(QGLContext);
    return d->bindTexture(pixmap, target, format, false);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
GLuint QGLContext::bindTexture(const QPixmap &pixmap, QMacCompatGLenum target, QMacCompatGLint format)
{
    Q_D(QGLContext);
    return d->bindTexture(pixmap, GLenum(target), GLint(format), false);
}
#endif

/*!
    Removes the texture identified by \a id from the texture cache,
    and calls glDeleteTextures() to delete the texture from the
    context.

    \sa bindTexture()
*/
void QGLContext::deleteTexture(GLuint id)
{
    if (qt_tex_cache) {
        QList<qint64> keys = qt_tex_cache->keys();
        for (int i = 0; i < keys.size(); ++i) {
            QGLTexture *tex = qt_tex_cache->object(keys.at(i));
            if (tex->id == id && tex->context == this) {
                tex->clean = true; // forces a glDeleteTextures() call
                qt_tex_cache->remove(keys.at(i));
                return;
            }
        }
    }

    // check the DDS cache if the texture wasn't found in the pixmap/image
    // cache
    QList<QString> ddsKeys = qgl_dds_cache()->keys();
    for (int i = 0; i < ddsKeys.size(); ++i) {
        GLuint texture = qgl_dds_cache()->value(ddsKeys.at(i));
        if (id == texture) {
            glDeleteTextures(1, &texture);
            qgl_dds_cache()->remove(ddsKeys.at(i));
            return;
        }
    }
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLContext::deleteTexture(QMacCompatGLuint id)
{
    return deleteTexture(GLuint(id));
}
#endif

void qt_add_rect_to_array(const QRectF &r, q_vertexType *array)
{
    qreal left = r.left();
    qreal right = r.right();
    qreal top = r.top();
    qreal bottom = r.bottom();

    array[0] = f2vt(left);
    array[1] = f2vt(top);
    array[2] = f2vt(right);
    array[3] = f2vt(top);
    array[4] = f2vt(right);
    array[5] = f2vt(bottom);
    array[6] = f2vt(left);
    array[7] = f2vt(bottom);
}

void qt_add_texcoords_to_array(qreal x1, qreal y1, qreal x2, qreal y2, q_vertexType *array)
{
    array[0] = f2vt(x1);
    array[1] = f2vt(y1);
    array[2] = f2vt(x2);
    array[3] = f2vt(y1);
    array[4] = f2vt(x2);
    array[5] = f2vt(y2);
    array[6] = f2vt(x1);
    array[7] = f2vt(y2);
}

static void qDrawTextureRect(const QRectF &target, GLint textureWidth, GLint textureHeight, GLenum textureTarget)
{
    q_vertexType tx = f2vt(1);
    q_vertexType ty = f2vt(1);

#ifdef QT_OPENGL_ES
    Q_UNUSED(textureWidth);
    Q_UNUSED(textureHeight);
    Q_UNUSED(textureTarget);
#else
    if (textureTarget != GL_TEXTURE_2D) {
        if (textureWidth == -1 || textureHeight == -1) {
            glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_WIDTH, &textureWidth);
            glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_HEIGHT, &textureHeight);
        }

        tx = f2vt(textureWidth);
        ty = f2vt(textureHeight);
    }
#endif

    q_vertexType texCoordArray[4*2] = {
        0, ty, tx, ty, tx, 0, 0, 0
    };

    q_vertexType vertexArray[4*2];
    qt_add_rect_to_array(target, vertexArray);

#if !defined(QT_OPENGL_ES_2)
    glVertexPointer(2, q_vertexTypeEnum, 0, vertexArray);
    glTexCoordPointer(2, q_vertexTypeEnum, 0, texCoordArray);

    glEnableClientState(GL_VERTEX_ARRAY);
    glEnableClientState(GL_TEXTURE_COORD_ARRAY);
    glDrawArrays(GL_TRIANGLE_FAN, 0, 4);

    glDisableClientState(GL_VERTEX_ARRAY);
    glDisableClientState(GL_TEXTURE_COORD_ARRAY);
#endif
}

/*!
    \since 4.4

    Draws the given texture, \a textureId, to the given target rectangle,
    \a target, in OpenGL model space. The \a textureTarget should be a 2D
    texture target.

    Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLContext::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
#ifdef QT_OPENGL_ES
    if (textureTarget != GL_TEXTURE_2D) {
        qWarning("QGLContext::drawTexture(): texture target must be GL_TEXTURE_2D on OpenGL ES");
        return;
    }
#else
    const bool wasEnabled = glIsEnabled(GL_TEXTURE_2D);
    GLint oldTexture;
    glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTexture);
#endif

    glEnable(textureTarget);
    glBindTexture(textureTarget, textureId);

    qDrawTextureRect(target, -1, -1, textureTarget);

#ifdef QT_OPENGL_ES
    glDisable(textureTarget);
#else
    if (!wasEnabled)
        glDisable(textureTarget);
    glBindTexture(textureTarget, oldTexture);
#endif
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLContext::drawTexture(const QRectF &target, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    drawTexture(target, GLuint(textureId), GLenum(textureTarget));
}
#endif

/*!
    \since 4.4

    Draws the given texture at the given \a point in OpenGL model
    space. The \a textureTarget should be a 2D texture target.

    Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLContext::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
    // this would be ok on OpenGL ES 2.0, but currently we don't have a define for that
#ifdef QT_OPENGL_ES
    Q_UNUSED(point);
    Q_UNUSED(textureId);
    Q_UNUSED(textureTarget);
    qWarning("drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget) not supported with OpenGL ES, use rect version instead");
#else
    const bool wasEnabled = glIsEnabled(GL_TEXTURE_2D);
    GLint oldTexture;
    glGetIntegerv(GL_TEXTURE_BINDING_2D, &oldTexture);

    glEnable(textureTarget);
    glBindTexture(textureTarget, textureId);

    GLint textureWidth;
    GLint textureHeight;

    glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_WIDTH, &textureWidth);
    glGetTexLevelParameteriv(textureTarget, 0, GL_TEXTURE_HEIGHT, &textureHeight);

    qDrawTextureRect(QRectF(point, QSizeF(textureWidth, textureHeight)), textureWidth, textureHeight, textureTarget);

    if (!wasEnabled)
        glDisable(textureTarget);
    glBindTexture(textureTarget, oldTexture);
#endif
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLContext::drawTexture(const QPointF &point, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    drawTexture(point, GLuint(textureId), GLenum(textureTarget));
}
#endif


/*!
    This function sets the limit for the texture cache to \a size,
    expressed in kilobytes.

    By default, the cache limit is approximately 64 MB.

    \sa textureCacheLimit()
*/
void QGLContext::setTextureCacheLimit(int size)
{
    qt_tex_cache_limit = size;
    if (qt_tex_cache)
        qt_tex_cache->setMaxCost(qt_tex_cache_limit);
}

/*!
    Returns the current texture cache limit in kilobytes.

    \sa setTextureCacheLimit()
*/
int QGLContext::textureCacheLimit()
{
    return qt_tex_cache_limit;
}


/*!
    \fn QGLFormat QGLContext::format() const

    Returns the frame buffer format that was obtained (this may be a
    subset of what was requested).

    \sa requestedFormat()
*/

/*!
    \fn QGLFormat QGLContext::requestedFormat() const

    Returns the frame buffer format that was originally requested in
    the constructor or setFormat().

    \sa format()
*/

/*!
    Sets a \a format for this context. The context is \link reset()
    reset\endlink.

    Call create() to create a new GL context that tries to match the
    new format.

    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 7

    \sa format(), reset(), create()
*/

void QGLContext::setFormat(const QGLFormat &format)
{
    Q_D(QGLContext);
    reset();
    d->glFormat = d->reqFormat = format;
}

/*!
    \internal
*/
void QGLContext::setDevice(QPaintDevice *pDev)
{
    Q_D(QGLContext);
    if (isValid())
        reset();
    d->paintDevice = pDev;
    if (d->paintDevice && (d->paintDevice->devType() != QInternal::Widget
                           && d->paintDevice->devType() != QInternal::Pixmap
                           && d->paintDevice->devType() != QInternal::Pbuffer)) {
        qWarning("QGLContext: Unsupported paint device type");
    }
}

/*!
    \fn bool QGLContext::isValid() const

    Returns true if a GL rendering context has been successfully
    created; otherwise returns false.
*/

/*!
    \fn void QGLContext::setValid(bool valid)
    \internal

    Forces the GL rendering context to be valid.
*/

/*!
    \fn bool QGLContext::isSharing() const

    Returns true if this context is sharing its GL context with
    another QGLContext, otherwise false is returned. Note that context
    sharing might not be supported between contexts with different
    formats.
*/

/*!
    \fn bool QGLContext::deviceIsPixmap() const

    Returns true if the paint device of this context is a pixmap;
    otherwise returns false.
*/

/*!
    \fn bool QGLContext::windowCreated() const

    Returns true if a window has been created for this context;
    otherwise returns false.

    \sa setWindowCreated()
*/

/*!
    \fn void QGLContext::setWindowCreated(bool on)

    If \a on is true the context has had a window created for it. If
    \a on is false no window has been created for the context.

    \sa windowCreated()
*/

/*!
    \fn uint QGLContext::colorIndex(const QColor& c) const

    \internal

    Returns a colormap index for the color c, in ColorIndex mode. Used
    by qglColor() and qglClearColor().
*/


/*!
    \fn bool QGLContext::initialized() const

    Returns true if this context has been initialized, i.e. if
    QGLWidget::initializeGL() has been performed on it; otherwise
    returns false.

    \sa setInitialized()
*/

/*!
    \fn void QGLContext::setInitialized(bool on)

    If \a on is true the context has been initialized, i.e.
    QGLContext::setInitialized() has been called on it. If \a on is
    false the context has not been initialized.

    \sa initialized()
*/

/*!
    \fn const QGLContext* QGLContext::currentContext()

    Returns the current context, i.e. the context to which any OpenGL
    commands will currently be directed. Returns 0 if no context is
    current.

    \sa makeCurrent()
*/

/*!
    \fn QColor QGLContext::overlayTransparentColor() const

    If this context is a valid context in an overlay plane, returns
    the plane's transparent color. Otherwise returns an \link
    QColor::isValid() invalid \endlink color.

    The returned color's \link QColor::pixel() pixel \endlink value is
    the index of the transparent color in the colormap of the overlay
    plane. (Naturally, the color's RGB values are meaningless.)

    The returned QColor object will generally work as expected only
    when passed as the argument to QGLWidget::qglColor() or
    QGLWidget::qglClearColor(). Under certain circumstances it can
    also be used to draw transparent graphics with a QPainter. See the
    examples/opengl/overlay_x11 example for details.
*/


/*!
    Creates the GL context. Returns true if it was successful in
    creating a valid GL rendering context on the paint device
    specified in the constructor; otherwise returns false (i.e. the
    context is invalid).

    After successful creation, format() returns the set of features of
    the created GL rendering context.

    If \a shareContext points to a valid QGLContext, this method will
    try to establish OpenGL display list and texture object sharing
    between this context and the \a shareContext. Note that this may
    fail if the two contexts have different \l {format()} {formats}.
    Use isSharing() to see if sharing is in effect.

    \warning Implementation note: initialization of C++ class
    members usually takes place in the class constructor. QGLContext
    is an exception because it must be simple to customize. The
    virtual functions chooseContext() (and chooseVisual() for X11) can
    be reimplemented in a subclass to select a particular context. The
    problem is that virtual functions are not properly called during
    construction (even though this is correct C++) because C++
    constructs class hierarchies from the bottom up. For this reason
    we need a create() function.

    \sa chooseContext(), format(), isValid()
*/

bool QGLContext::create(const QGLContext* shareContext)
{
    Q_D(QGLContext);
    if (!d->paintDevice)
        return false;
    reset();
    d->valid = chooseContext(shareContext);
    if (d->valid && d->paintDevice->devType() == QInternal::Widget) {
        QWidgetPrivate *wd = qt_widget_private(static_cast<QWidget *>(d->paintDevice));
        wd->usesDoubleBufferedGLContext = d->glFormat.doubleBuffer();
    }
    if (d->sharing)  // ok, we managed to share
        qgl_share_reg()->addShare(this, shareContext);
    return d->valid;
}

bool QGLContext::isValid() const
{
    Q_D(const QGLContext);
    return d->valid;
}

void QGLContext::setValid(bool valid)
{
    Q_D(QGLContext);
    d->valid = valid;
}

bool QGLContext::isSharing() const
{
    Q_D(const QGLContext);
    return d->sharing;
}

QGLFormat QGLContext::format() const
{
    Q_D(const QGLContext);
    return d->glFormat;
}

QGLFormat QGLContext::requestedFormat() const
{
    Q_D(const QGLContext);
    return d->reqFormat;
}

 QPaintDevice* QGLContext::device() const
{
    Q_D(const QGLContext);
    return d->paintDevice;
}

bool QGLContext::deviceIsPixmap() const
{
    Q_D(const QGLContext);
    return d->paintDevice->devType() == QInternal::Pixmap;
}


bool QGLContext::windowCreated() const
{
    Q_D(const QGLContext);
    return d->crWin;
}


void QGLContext::setWindowCreated(bool on)
{
    Q_D(QGLContext);
    d->crWin = on;
}

bool QGLContext::initialized() const
{
    Q_D(const QGLContext);
    return d->initDone;
}

void QGLContext::setInitialized(bool on)
{
    Q_D(QGLContext);
    d->initDone = on;
}

const QGLContext* QGLContext::currentContext()
{
    if (qgl_context_storage.hasLocalData())
        return qgl_context_storage.localData()->context;
    return 0;
}

/*!
    \fn bool QGLContext::chooseContext(const QGLContext* shareContext = 0)

    This semi-internal function is called by create(). It creates a
    system-dependent OpenGL handle that matches the format() of \a
    shareContext as closely as possible, returning true if successful
    or false if a suitable handle could not be found.

    On Windows, it calls the virtual function choosePixelFormat(),
    which finds a matching pixel format identifier. On X11, it calls
    the virtual function chooseVisual() which finds an appropriate X
    visual. On other platforms it may work differently.
*/

/*! \fn int QGLContext::choosePixelFormat(void* dummyPfd, HDC pdc)

    \bold{Win32 only:} This virtual function chooses a pixel format
    that matches the OpenGL \link setFormat() format\endlink.
    Reimplement this function in a subclass if you need a custom
    context.

    \warning The \a dummyPfd pointer and \a pdc are used as a \c
    PIXELFORMATDESCRIPTOR*. We use \c void to avoid using
    Windows-specific types in our header files.

    \sa chooseContext()
*/

/*! \fn void *QGLContext::chooseVisual()

  \bold{X11 only:} This virtual function tries to find a visual that
  matches the format, reducing the demands if the original request
  cannot be met.

  The algorithm for reducing the demands of the format is quite
  simple-minded, so override this method in your subclass if your
  application has spcific requirements on visual selection.

  \sa chooseContext()
*/

/*! \fn void *QGLContext::tryVisual(const QGLFormat& f, int bufDepth)
  \internal

  \bold{X11 only:} This virtual function chooses a visual that matches
  the OpenGL \link format() format\endlink. Reimplement this function
  in a subclass if you need a custom visual.

  \sa chooseContext()
*/

/*!
    \fn void QGLContext::reset()

    Resets the context and makes it invalid.

    \sa create(), isValid()
*/


/*!
    \fn void QGLContext::makeCurrent()

    Makes this context the current OpenGL rendering context. All GL
    functions you call operate on this context until another context
    is made current.

    In some very rare cases the underlying call may fail. If this
    occurs an error message is output to stderr.
*/


/*!
    \fn void QGLContext::swapBuffers() const

    Swaps the screen contents with an off-screen buffer. Only works if
    the context is in double buffer mode.

    \sa QGLFormat::setDoubleBuffer()
*/


/*!
    \fn void QGLContext::doneCurrent()

    Makes no GL context the current context. Normally, you do not need
    to call this function; QGLContext calls it as necessary.
*/


/*!
    \fn QPaintDevice* QGLContext::device() const

    Returns the paint device set for this context.

    \sa QGLContext::QGLContext()
*/

/*!
    \obsolete
    \fn void QGLContext::generateFontDisplayLists(const QFont& font, int listBase)

    Generates a set of 256 display lists for the 256 first characters
    in the font \a font. The first list will start at index \a listBase.

    \sa QGLWidget::renderText()
*/


/*****************************************************************************
  QGLWidget implementation
 *****************************************************************************/


/*!
    \class QGLWidget
    \brief The QGLWidget class is a widget for rendering OpenGL graphics.

    \ingroup multimedia
    \mainclass

    QGLWidget provides functionality for displaying OpenGL graphics
    integrated into a Qt application. It is very simple to use. You
    inherit from it and use the subclass like any other QWidget,
    except that you have the choice between using QPainter and
    standard OpenGL rendering commands.

    QGLWidget provides three convenient virtual functions that you can
    reimplement in your subclass to perform the typical OpenGL tasks:

    \list
    \i paintGL() - Renders the OpenGL scene. Gets called whenever the widget
    needs to be updated.
    \i resizeGL() - Sets up the OpenGL viewport, projection, etc. Gets
    called whenever the widget has been resized (and also when it
    is shown for the first time because all newly created widgets get a
    resize event automatically).
    \i initializeGL() - Sets up the OpenGL rendering context, defines display
    lists, etc. Gets called once before the first time resizeGL() or
    paintGL() is called.
    \endlist

    Here is a rough outline of how a QGLWidget subclass might look:

    \snippet doc/src/snippets/code/src_opengl_qgl.cpp 8

    If you need to trigger a repaint from places other than paintGL()
    (a typical example is when using \link QTimer timers\endlink to
    animate scenes), you should call the widget's updateGL() function.

    Your widget's OpenGL rendering context is made current when
    paintGL(), resizeGL(), or initializeGL() is called. If you need to
    call the standard OpenGL API functions from other places (e.g. in
    your widget's constructor or in your own paint functions), you
    must call makeCurrent() first.

    QGLWidget provides functions for requesting a new display \link
    QGLFormat format\endlink and you can also create widgets with
    customized rendering \link QGLContext contexts\endlink.

    You can also share OpenGL display lists between QGLWidgets (see
    the documentation of the QGLWidget constructors for details).

    Note that under Windows, the QGLContext belonging to a QGLWidget
    has to be recreated when the QGLWidget is reparented. This is
    necessary due to limitations on the Windows platform. This will
    most likely cause problems for users that have subclassed and
    installed their own QGLContext on a QGLWidget. It is possible to
    work around this issue by putting the QGLWidget inside a dummy
    widget and then reparenting the dummy widget, instead of the
    QGLWidget. This will side-step the issue altogether, and is what
    we recommend for users that need this kind of functionality.

    On Mac OS X, when Qt is built with Cocoa support, a QGLWidget
    can't have any sibling widgets placed ontop of itself. This is due
    to limitations in the Cocoa API and is not supported by Apple.

    \section1 Overlays

    The QGLWidget creates a GL overlay context in addition to the
    normal context if overlays are supported by the underlying system.

    If you want to use overlays, you specify it in the \link QGLFormat
    format\endlink. (Note: Overlay must be requested in the format
    passed to the QGLWidget constructor.) Your GL widget should also
    implement some or all of these virtual methods:

    \list
    \i paintOverlayGL()
    \i resizeOverlayGL()
    \i initializeOverlayGL()
    \endlist

    These methods work in the same way as the normal paintGL() etc.
    functions, except that they will be called when the overlay
    context is made current. You can explicitly make the overlay
    context current by using makeOverlayCurrent(), and you can access
    the overlay context directly (e.g. to ask for its transparent
    color) by calling overlayContext().

    On X servers in which the default visual is in an overlay plane,
    non-GL Qt windows can also be used for overlays.

    \section1 Painting Techniques

    As described above, subclass QGLWidget to render pure 3D content in the
    following way:

    \list
    \o Reimplement the QGLWidget::initializeGL() and QGLWidget::resizeGL() to
       set up the OpenGL state and provide a perspective transformation.
    \o Reimplement QGLWidget::paintGL() to paint the 3D scene, calling only
       OpenGL functions to draw on the widget.
    \endlist

    It is also possible to draw 2D graphics onto a QGLWidget subclass, it is necessary
    to reimplement QGLWidget::paintEvent() and do the following:

    \list
    \o Construct a QPainter object.
    \o Initialize it for use on the widget with the QPainter::begin() function.
    \o Draw primitives using QPainter's member functions.
    \o Call QPainter::end() to finish painting.
    \endlist

    Overpainting 2D content on top of 3D content takes a little more effort.
    One approach to doing this is shown in the
    \l{Overpainting Example}{Overpainting} example.

    \e{OpenGL is a trademark of Silicon Graphics, Inc. in the United States and other
    countries.}

    \sa QGLPixelBuffer, {Hello GL Example}, {2D Painting Example}, {Overpainting Example},
        {Grabber Example}
*/

/*!
    Constructs an OpenGL widget with a \a parent widget.

    The \link QGLFormat::defaultFormat() default format\endlink is
    used. The widget will be \link isValid() invalid\endlink if the
    system has no \link QGLFormat::hasOpenGL() OpenGL support\endlink.

    The \a parent and widget flag, \a f, arguments are passed
    to the QWidget constructor.

    If \a shareWidget is a valid QGLWidget, this widget will share
    OpenGL display lists and texture objects with \a shareWidget. But
    if \a shareWidget and this widget have different \l {format()}
    {formats}, sharing might not be possible. You can check whether
    sharing is in effect by calling isSharing().

    The initialization of OpenGL rendering state, etc. should be done
    by overriding the initializeGL() function, rather than in the
    constructor of your QGLWidget subclass.

    \sa QGLFormat::defaultFormat(), {Textures Example}
*/

QGLWidget::QGLWidget(QWidget *parent, const QGLWidget* shareWidget, Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(new QGLContext(QGLFormat::defaultFormat(), this), shareWidget);
}


/*!
    Constructs an OpenGL widget with parent \a parent.

    The \a format argument specifies the desired \link QGLFormat
    rendering options \endlink. If the underlying OpenGL/Window system
    cannot satisfy all the features requested in \a format, the
    nearest subset of features will be used. After creation, the
    format() method will return the actual format obtained.

    The widget will be \link isValid() invalid\endlink if the system
    has no \link QGLFormat::hasOpenGL() OpenGL support\endlink.

    The \a parent and widget flag, \a f, arguments are passed
    to the QWidget constructor.

    If \a shareWidget is a valid QGLWidget, this widget will share
    OpenGL display lists and texture objects with \a shareWidget. But
    if \a shareWidget and this widget have different \l {format()}
    {formats}, sharing might not be possible. You can check whether
    sharing is in effect by calling isSharing().

    The initialization of OpenGL rendering state, etc. should be done
    by overriding the initializeGL() function, rather than in the
    constructor of your QGLWidget subclass.

    \sa QGLFormat::defaultFormat(), isValid()
*/

QGLWidget::QGLWidget(const QGLFormat &format, QWidget *parent, const QGLWidget* shareWidget,
                     Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(new QGLContext(format, this), shareWidget);
}

/*!
    Constructs an OpenGL widget with parent \a parent.

    The \a context argument is a pointer to the QGLContext that
    you wish to be bound to this widget. This allows you to pass in
    your own QGLContext sub-classes.

    The widget will be \link isValid() invalid\endlink if the system
    has no \link QGLFormat::hasOpenGL() OpenGL support\endlink.

    The \a parent and widget flag, \a f, arguments are passed
    to the QWidget constructor.

    If \a shareWidget is a valid QGLWidget, this widget will share
    OpenGL display lists and texture objects with \a shareWidget. But
    if \a shareWidget and this widget have different \l {format()}
    {formats}, sharing might not be possible. You can check whether
    sharing is in effect by calling isSharing().

    The initialization of OpenGL rendering state, etc. should be done
    by overriding the initializeGL() function, rather than in the
    constructor of your QGLWidget subclass.

    \sa QGLFormat::defaultFormat(), isValid()
*/
QGLWidget::QGLWidget(QGLContext *context, QWidget *parent, const QGLWidget *shareWidget,
                     Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(context, shareWidget);
}

/*!
    Destroys the widget.
*/

QGLWidget::~QGLWidget()
{
    Q_D(QGLWidget);
#if defined(GLX_MESA_release_buffers) && defined(QGL_USE_MESA_EXT)
    bool doRelease = (glcx && glcx->windowCreated());
#endif
    delete d->glcx;
#if defined(Q_WGL)
    delete d->olcx;
#endif
#if defined(GLX_MESA_release_buffers) && defined(QGL_USE_MESA_EXT)
    if (doRelease)
        glXReleaseBuffersMESA(x11Display(), winId());
#endif
    d->cleanupColormaps();

#ifdef Q_WS_MAC
    QWidget *current = parentWidget();
    while (current) {
        qt_widget_private(current)->glWidgets.removeAll(QWidgetPrivate::GlWidgetInfo(this));
        if (current->isWindow())
            break;
        current = current->parentWidget();
    };
#endif
}

/*!
    \fn QGLFormat QGLWidget::format() const

    Returns the format of the contained GL rendering context.
*/

/*!
    \fn bool QGLWidget::doubleBuffer() const

    Returns true if the contained GL rendering context has double
    buffering; otherwise returns false.

    \sa QGLFormat::doubleBuffer()
*/

/*!
    \fn void QGLWidget::setAutoBufferSwap(bool on)

    If \a on is true automatic GL buffer swapping is switched on;
    otherwise it is switched off.

    If \a on is true and the widget is using a double-buffered format,
    the background and foreground GL buffers will automatically be
    swapped after each paintGL() call.

    The buffer auto-swapping is on by default.

    \sa autoBufferSwap(), doubleBuffer(), swapBuffers()
*/

/*!
    \fn bool QGLWidget::autoBufferSwap() const

    Returns true if the widget is doing automatic GL buffer swapping;
    otherwise returns false.

    \sa setAutoBufferSwap()
*/

/*!
    \fn void *QGLContext::getProcAddress(const QString &proc) const

    Returns a function pointer to the GL extension function passed in
    \a proc. 0 is returned if a pointer to the function could not be
    obtained.
*/

/*!
    \fn bool QGLWidget::isValid() const

    Returns true if the widget has a valid GL rendering context;
    otherwise returns false. A widget will be invalid if the system
    has no \link QGLFormat::hasOpenGL() OpenGL support\endlink.
*/

bool QGLWidget::isValid() const
{
    Q_D(const QGLWidget);
    return d->glcx && d->glcx->isValid();
}

/*!
    \fn bool QGLWidget::isSharing() const

    Returns true if this widget's GL context is shared with another GL
    context, otherwise false is returned. Context sharing might not be
    possible if the QGLWidgets use different formats.

    \sa format()
*/

bool QGLWidget::isSharing() const
{
    Q_D(const QGLWidget);
    return d->glcx->isSharing();
}

/*!
    \fn void QGLWidget::makeCurrent()

    Makes this widget the current widget for OpenGL operations, i.e.
    makes the widget's rendering context the current OpenGL rendering
    context.
*/

void QGLWidget::makeCurrent()
{
    Q_D(QGLWidget);
    d->glcx->makeCurrent();
}

/*!
    \fn void QGLWidget::doneCurrent()

    Makes no GL context the current context. Normally, you do not need
    to call this function; QGLContext calls it as necessary. However,
    it may be useful in multithreaded environments.
*/

void QGLWidget::doneCurrent()
{
    Q_D(QGLWidget);
    d->glcx->doneCurrent();
}

/*!
    \fn void QGLWidget::swapBuffers()

    Swaps the screen contents with an off-screen buffer. This only
    works if the widget's format specifies double buffer mode.

    Normally, there is no need to explicitly call this function
    because it is done automatically after each widget repaint, i.e.
    each time after paintGL() has been executed.

    \sa doubleBuffer(), setAutoBufferSwap(), QGLFormat::setDoubleBuffer()
*/

void QGLWidget::swapBuffers()
{
    Q_D(QGLWidget);
    d->glcx->swapBuffers();
}


/*!
    \fn const QGLContext* QGLWidget::overlayContext() const

    Returns the overlay context of this widget, or 0 if this widget
    has no overlay.

    \sa context()
*/



/*!
    \fn void QGLWidget::makeOverlayCurrent()

    Makes the overlay context of this widget current. Use this if you
    need to issue OpenGL commands to the overlay context outside of
    initializeOverlayGL(), resizeOverlayGL(), and paintOverlayGL().

    Does nothing if this widget has no overlay.

    \sa makeCurrent()
*/


/*!
  \obsolete

  Sets a new format for this widget.

  If the underlying OpenGL/Window system cannot satisfy all the
  features requested in \a format, the nearest subset of features will
  be used. After creation, the format() method will return the actual
  rendering context format obtained.

  The widget will be assigned a new QGLContext, and the initializeGL()
  function will be executed for this new context before the first
  resizeGL() or paintGL().

  This method will try to keep display list and texture object sharing
  in effect with other QGLWidgets, but changing the format might make
  sharing impossible. Use isSharing() to see if sharing is still in
  effect.

  \sa format(), isSharing(), isValid()
*/

void QGLWidget::setFormat(const QGLFormat &format)
{
    setContext(new QGLContext(format,this));
}




/*!
    \fn const QGLContext *QGLWidget::context() const

    Returns the context of this widget.

    It is possible that the context is not valid (see isValid()), for
    example, if the underlying hardware does not support the format
    attributes that were requested.
*/

/*
  \fn void QGLWidget::setContext(QGLContext *context,
                                 const QGLContext* shareContext,
                                 bool deleteOldContext)
  \obsolete

  Sets a new context for this widget. The QGLContext \a context must
  be created using \e new. QGLWidget will delete \a context when
  another context is set or when the widget is destroyed.

  If \a context is invalid, QGLContext::create() is performed on
  it. The initializeGL() function will then be executed for the new
  context before the first resizeGL() or paintGL().

  If \a context is invalid, this method will try to keep display list
  and texture object sharing in effect, or (if \a shareContext points
  to a valid context) start display list and texture object sharing
  with that context, but sharing might be impossible if the two
  contexts have different \l {format()} {formats}. Use isSharing() to
  see whether sharing is in effect.

  If \a deleteOldContext is true (the default), the existing context
  will be deleted. You may use false here if you have kept a pointer
  to the old context (as returned by context()), and want to restore
  that context later.

  \sa context(), isSharing()
*/



/*!
    \fn void QGLWidget::updateGL()

    Updates the widget by calling glDraw().
*/

void QGLWidget::updateGL()
{
    if (updatesEnabled())
        glDraw();
}


/*!
    \fn void QGLWidget::updateOverlayGL()

    Updates the widget's overlay (if any). Will cause the virtual
    function paintOverlayGL() to be executed.

    The widget's rendering context will become the current context and
    initializeGL() will be called if it hasn't already been called.
*/


/*!
    This virtual function is called once before the first call to
    paintGL() or resizeGL(), and then once whenever the widget has
    been assigned a new QGLContext. Reimplement it in a subclass.

    This function should set up any required OpenGL context rendering
    flags, defining display lists, etc.

    There is no need to call makeCurrent() because this has already
    been done when this function is called.
*/

void QGLWidget::initializeGL()
{
}


/*!
    This virtual function is called whenever the widget needs to be
    painted. Reimplement it in a subclass.

    There is no need to call makeCurrent() because this has already
    been done when this function is called.
*/

void QGLWidget::paintGL()
{
}


/*!
    \fn void QGLWidget::resizeGL(int width , int height)

    This virtual function is called whenever the widget has been
    resized. The new size is passed in \a width and \a height.
    Reimplement it in a subclass.

    There is no need to call makeCurrent() because this has already
    been done when this function is called.
*/

void QGLWidget::resizeGL(int, int)
{
}



/*!
    This virtual function is used in the same manner as initializeGL()
    except that it operates on the widget's overlay context instead of
    the widget's main context. This means that initializeOverlayGL()
    is called once before the first call to paintOverlayGL() or
    resizeOverlayGL(). Reimplement it in a subclass.

    This function should set up any required OpenGL context rendering
    flags, defining display lists, etc. for the overlay context.

    There is no need to call makeOverlayCurrent() because this has
    already been done when this function is called.
*/

void QGLWidget::initializeOverlayGL()
{
}


/*!
    This virtual function is used in the same manner as paintGL()
    except that it operates on the widget's overlay context instead of
    the widget's main context. This means that paintOverlayGL() is
    called whenever the widget's overlay needs to be painted.
    Reimplement it in a subclass.

    There is no need to call makeOverlayCurrent() because this has
    already been done when this function is called.
*/

void QGLWidget::paintOverlayGL()
{
}


/*!
    \fn void QGLWidget::resizeOverlayGL(int width , int height)

    This virtual function is used in the same manner as paintGL()
    except that it operates on the widget's overlay context instead of
    the widget's main context. This means that resizeOverlayGL() is
    called whenever the widget has been resized. The new size is
    passed in \a width and \a height. Reimplement it in a subclass.

    There is no need to call makeOverlayCurrent() because this has
    already been done when this function is called.
*/

void QGLWidget::resizeOverlayGL(int, int)
{
}

/*! \fn bool QGLWidget::event(QEvent *e)
  \reimp
*/
#if !defined(Q_OS_WINCE) && !defined(Q_WS_QWS)
bool QGLWidget::event(QEvent *e)
{
    Q_D(QGLWidget);

    if (e->type() == QEvent::Paint) {
        QPoint offset;
        QPaintDevice *redirectedDevice = d->redirected(&offset);
        if (redirectedDevice && redirectedDevice->devType() == QInternal::Pixmap) {
            d->restoreRedirected();
            QPixmap pixmap = renderPixmap();
            d->setRedirected(redirectedDevice, offset);
            QPainter p(redirectedDevice);
            p.drawPixmap(-offset, pixmap);
            return true;
        }
    }

#if defined(Q_WS_X11)
    // prevents X errors on some systems, where we get a flush to a
    // hidden widget
    if (e->type() == QEvent::Hide) {
        makeCurrent();
        glFinish();
        doneCurrent();
    } else if (e->type() == QEvent::ParentChange) {
        if (d->glcx->d_func()->screen != d->xinfo.screen() || testAttribute(Qt::WA_TranslucentBackground)) {
            setContext(new QGLContext(d->glcx->requestedFormat(), this));
            // ### recreating the overlay isn't supported atm
        }
#if defined(QT_OPENGL_ES)
        // The window may have been re-created during re-parent - if so, the EGL
        // surface will need to be re-created.
        d->recreateEglSurface(false);
#endif
    }
#elif defined(Q_WS_WIN)
    if (e->type() == QEvent::ParentChange) {
        QGLContext *newContext = new QGLContext(d->glcx->requestedFormat(), this);
        qgl_share_reg()->replaceShare(d->glcx, newContext);
        setContext(newContext);
        // the overlay needs to be recreated as well
        delete d->olcx;
        if (isValid() && context()->format().hasOverlay()) {
            d->olcx = new QGLContext(QGLFormat::defaultOverlayFormat(), this);
            if (!d->olcx->create(isSharing() ? d->glcx : 0)) {
                delete d->olcx;
                d->olcx = 0;
                d->glcx->d_func()->glFormat.setOverlay(false);
            }
        } else {
            d->olcx = 0;
        }
    } else if (e->type() == QEvent::Show) {
        if (!format().rgba())
            d->updateColormap();
    }
#elif defined(Q_WS_MAC)
    if (e->type() == QEvent::MacGLWindowChange
#if 0 //(MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5)
        && ((QSysInfo::MacintoshVersion >= QSysInfo::MV_10_5 && isWindow())
            || QSysInfo::MacintoshVersion <= QSysInfo::MV_10_4)
#endif
        ) {
        if (d->needWindowChange) {
            d->needWindowChange = false;
            d->glcx->updatePaintDevice();
            update();
        }
        return true;
#  if defined(QT_MAC_USE_COCOA)
    } else if (e->type() == QEvent::MacGLClearDrawable) {
        d->glcx->d_ptr->clearDrawable();
#  endif
    }
#endif

    return QWidget::event(e);
}
#endif

/*!
    \fn void QGLWidget::paintEvent(QPaintEvent *event)

    Handles paint events passed in the \a event parameter. Will cause
    the virtual paintGL() function to be called.

    The widget's rendering context will become the current context and
    initializeGL() will be called if it hasn't already been called.
*/

void QGLWidget::paintEvent(QPaintEvent *)
{
    if (updatesEnabled()) {
        glDraw();
        updateOverlayGL();
    }
}


/*!
    \fn void QGLWidget::resizeEvent(QResizeEvent *event)

    Handles resize events that are passed in the \a event parameter.
    Calls the virtual function resizeGL().
*/


/*!
    \fn void QGLWidget::setMouseTracking(bool enable)

    If \a enable is true then mouse tracking is enabled; otherwise it
    is disabled.
*/


/*!
    Renders the current scene on a pixmap and returns the pixmap.

    You can use this method on both visible and invisible QGLWidgets.

    This method will create a pixmap and a temporary QGLContext to
    render on the pixmap. It will then call initializeGL(),
    resizeGL(), and paintGL() on this context. Finally, the widget's
    original GL context is restored.

    The size of the pixmap will be \a w pixels wide and \a h pixels
    high unless one of these parameters is 0 (the default), in which
    case the pixmap will have the same size as the widget.

    If \a useContext is true, this method will try to be more
    efficient by using the existing GL context to render the pixmap.
    The default is false. Only use true if you understand the risks.
    Note that under Windows a temporary context has to be created
    and usage of the \e useContext parameter is not supported.

    Overlays are not rendered onto the pixmap.

    If the GL rendering context and the desktop have different bit
    depths, the result will most likely look surprising.

    Note that the creation of display lists, modifications of the view
    frustum etc. should be done from within initializeGL(). If this is
    not done, the temporary QGLContext will not be initialized
    properly, and the rendered pixmap may be incomplete/corrupted.
*/

QPixmap QGLWidget::renderPixmap(int w, int h, bool useContext)
{
    Q_D(QGLWidget);
    QSize sz = size();
    if ((w > 0) && (h > 0))
        sz = QSize(w, h);

#if defined(Q_WS_X11)
    extern int qt_x11_preferred_pixmap_depth;
    int old_depth = qt_x11_preferred_pixmap_depth;
    qt_x11_preferred_pixmap_depth = x11Info().depth();

    QPixmapData *data = new QX11PixmapData(QPixmapData::PixmapType);
    data->resize(sz.width(), sz.height());
    QPixmap pm(data);
    qt_x11_preferred_pixmap_depth = old_depth;
    QX11Info xinfo = x11Info();

    // make sure we use a pixmap with the same depth/visual as the widget
    if (xinfo.visual() != QX11Info::appVisual()) {
        QX11InfoData* xd = pm.x11Info().getX11Data(true);
        xd->depth = xinfo.depth();
        xd->visual = static_cast<Visual *>(xinfo.visual());
        const_cast<QX11Info &>(pm.x11Info()).setX11Data(xd);
    }

#else
    QPixmap pm(sz);
#endif

    d->glcx->doneCurrent();

    bool success = true;

    if (useContext && isValid() && d->renderCxPm(&pm))
        return pm;

    QGLFormat fmt = d->glcx->requestedFormat();
    fmt.setDirectRendering(false);                // Direct is unlikely to work
    fmt.setDoubleBuffer(false);                // We don't need dbl buf
#ifdef Q_WS_MAC // crash prevention on the Mac - it's unlikely to work anyway
    fmt.setSampleBuffers(false);
#endif

    QGLContext* ocx = d->glcx;
    ocx->doneCurrent();
    d->glcx = new QGLContext(fmt, &pm);
    d->glcx->create();

    if (d->glcx->isValid())
        updateGL();
    else
        success = false;

    delete d->glcx;
    d->glcx = ocx;

    ocx->makeCurrent();

    if (success) {
#if defined(Q_WS_X11)
        if (xinfo.visual() != QX11Info::appVisual()) {
            QImage image = pm.toImage();
            QPixmap p = QPixmap::fromImage(image);
            return p;
        }
#endif
        return pm;
    }
    return QPixmap();
}

/*!
    Returns an image of the frame buffer. If \a withAlpha is true the
    alpha channel is included.

    Depending on your hardware, you can explicitly select which color
    buffer to grab with a glReadBuffer() call before calling this
    function.
*/
QImage QGLWidget::grabFrameBuffer(bool withAlpha)
{
    makeCurrent();
    QImage res;
    int w = width();
    int h = height();
    if (format().rgba()) {
        res = qt_gl_read_framebuffer(QSize(w, h), format().alpha(), withAlpha);
    } else {
#if defined (Q_WS_WIN) && !defined(QT_OPENGL_ES)
        res = QImage(w, h, QImage::Format_Indexed8);
        glReadPixels(0, 0, w, h, GL_COLOR_INDEX, GL_UNSIGNED_BYTE, res.bits());
        const QVector<QColor> pal = QColormap::instance().colormap();
        if (pal.size()) {
            res.setNumColors(pal.size());
            for (int i = 0; i < pal.size(); i++)
                res.setColor(i, pal.at(i).rgb());
        }
        res = res.mirrored();
#endif
    }

    return res;
}



/*!
    Initializes OpenGL for this widget's context. Calls the virtual
    function initializeGL().
*/

void QGLWidget::glInit()
{
    Q_D(QGLWidget);
    if (!isValid())
        return;
    makeCurrent();
    initializeGL();
    d->glcx->setInitialized(true);
}


/*!
    Executes the virtual function paintGL().

    The widget's rendering context will become the current context and
    initializeGL() will be called if it hasn't already been called.
*/

void QGLWidget::glDraw()
{
    Q_D(QGLWidget);
    if (!isValid())
        return;
    makeCurrent();
#ifndef QT_OPENGL_ES
    if (d->glcx->deviceIsPixmap())
        glDrawBuffer(GL_FRONT);
#endif
    if (!d->glcx->initialized()) {
        glInit();
        resizeGL(d->glcx->device()->width(), d->glcx->device()->height()); // New context needs this "resize"
    }
    paintGL();
    if (doubleBuffer()) {
        if (d->autoSwap)
            swapBuffers();
    } else {
        glFlush();
    }
}

/*!
    Convenience function for specifying a drawing color to OpenGL.
    Calls glColor4 (in RGBA mode) or glIndex (in color-index mode)
    with the color \a c. Applies to this widgets GL context.

    \sa qglClearColor(), QGLContext::currentContext(), QColor
*/

void QGLWidget::qglColor(const QColor& c) const
{
#if !defined(QT_OPENGL_ES_2)
#ifdef QT_OPENGL_ES
    glColor4f(c.red()/255.0, c.green()/255.0, c.blue()/255.0, c.alpha()/255.0);
#else
    Q_D(const QGLWidget);
    const QGLContext *ctx = QGLContext::currentContext();
    if (ctx) {
        if (ctx->format().rgba())
            glColor4ub(c.red(), c.green(), c.blue(), c.alpha());
        else if (!d->cmap.isEmpty()) { // QGLColormap in use?
            int i = d->cmap.find(c.rgb());
            if (i < 0)
                i = d->cmap.findNearest(c.rgb());
            glIndexi(i);
        } else
            glIndexi(ctx->colorIndex(c));
    }
#endif //QT_OPENGL_ES
#endif //QT_OPENGL_ES_2
}

/*!
    Convenience function for specifying the clearing color to OpenGL.
    Calls glClearColor (in RGBA mode) or glClearIndex (in color-index
    mode) with the color \a c. Applies to this widgets GL context.

    \sa qglColor(), QGLContext::currentContext(), QColor
*/

void QGLWidget::qglClearColor(const QColor& c) const
{
#ifdef QT_OPENGL_ES
    glClearColor((GLfloat)c.red() / 255.0, (GLfloat)c.green() / 255.0,
                 (GLfloat)c.blue() / 255.0, (GLfloat) c.alpha() / 255.0);
#else
    Q_D(const QGLWidget);
    const QGLContext *ctx = QGLContext::currentContext();
    if (ctx) {
        if (ctx->format().rgba())
            glClearColor((GLfloat)c.red() / 255.0, (GLfloat)c.green() / 255.0,
                          (GLfloat)c.blue() / 255.0, (GLfloat) c.alpha() / 255.0);
        else if (!d->cmap.isEmpty()) { // QGLColormap in use?
            int i = d->cmap.find(c.rgb());
            if (i < 0)
                i = d->cmap.findNearest(c.rgb());
            glClearIndex(i);
        } else
            glClearIndex(ctx->colorIndex(c));
    }
#endif
}


/*!
    Converts the image \a img into the unnamed format expected by
    OpenGL functions such as glTexImage2D(). The returned image is not
    usable as a QImage, but QImage::width(), QImage::height() and
    QImage::bits() may be used with OpenGL. The GL format used is
    \c GL_RGBA.

    \omit ###

    \l opengl/texture example
    The following few lines are from the texture example. Most of the
    code is irrelevant, so we just quote the relevant bits:

    \quotefromfile opengl/texture/gltexobj.cpp
    \skipto tex1
    \printline tex1
    \printline gllogo.bmp

    We create \e tex1 (and another variable) for OpenGL, and load a real
    image into \e buf.

    \skipto convertToGLFormat
    \printline convertToGLFormat

    A few lines later, we convert \e buf into OpenGL format and store it
    in \e tex1.

    \skipto glTexImage2D
    \printline glTexImage2D
    \printline tex1.bits

    Note the dimension restrictions for texture images as described in
    the glTexImage2D() documentation. The width must be 2^m + 2*border
    and the height 2^n + 2*border where m and n are integers and
    border is either 0 or 1.

    Another function in the same example uses \e tex1 with OpenGL.

    \endomit
*/

QImage QGLWidget::convertToGLFormat(const QImage& img)
{
    QImage res(img.size(), QImage::Format_ARGB32);
    convertToGLFormatHelper(res, img.convertToFormat(QImage::Format_ARGB32), GL_RGBA);
    return res;
}


/*!
    \fn QGLColormap & QGLWidget::colormap() const

    Returns the colormap for this widget.

    Usually it is only top-level widgets that can have different
    colormaps installed. Asking for the colormap of a child widget
    will return the colormap for the child's top-level widget.

    If no colormap has been set for this widget, the QColormap
    returned will be empty.

    \sa setColormap()
*/

/*!
    \fn void QGLWidget::setColormap(const QGLColormap & cmap)

    Set the colormap for this widget to \a cmap. Usually it is only
    top-level widgets that can have colormaps installed.

    \sa colormap()
*/


/*!
    \obsolete

    Returns the value of the first display list that is generated for
    the characters in the given \a font. \a listBase indicates the base
    value used when generating the display lists for the font. The
    default value is 2000.
*/
int QGLWidget::fontDisplayListBase(const QFont & font, int listBase)
{
    Q_D(QGLWidget);
    int base;

    if (!d->glcx) { // this can't happen unless we run out of mem
        return 0;
    }

    // always regenerate font disp. lists for pixmaps - hw accelerated
    // contexts can't handle this otherwise
    bool regenerate = d->glcx->deviceIsPixmap();
#ifndef QT_NO_FONTCONFIG
    // font color needs to be part of the font cache key when using
    // antialiased fonts since one set of glyphs needs to be generated
    // for each font color
    QString color_key;
    if (font.styleStrategy() != QFont::NoAntialias) {
        GLfloat color[4];
#ifndef QT_OPENGL_ES
        glGetFloatv(GL_CURRENT_COLOR, color);
#endif
        color_key.sprintf("%f_%f_%f",color[0], color[1], color[2]);
    }
    QString key = font.key() + color_key + QString::number((int) regenerate);
#else
    QString key = font.key() + QString::number((int) regenerate);
#endif
    if (!regenerate && (d->displayListCache.find(key) != d->displayListCache.end())) {
        base = d->displayListCache[key];
    } else {
        int maxBase = listBase - 256;
        QMap<QString,int>::ConstIterator it;
        for (it = d->displayListCache.constBegin(); it != d->displayListCache.constEnd(); ++it) {
            if (maxBase < it.value()) {
                maxBase = it.value();
            }
        }
        maxBase += 256;
        d->glcx->generateFontDisplayLists(font, maxBase);
        d->displayListCache[key] = maxBase;
        base = maxBase;
    }
    return base;
}

static void qt_save_gl_state()
{
#ifndef QT_OPENGL_ES
    glPushClientAttrib(GL_CLIENT_ALL_ATTRIB_BITS);
    glPushAttrib(GL_ALL_ATTRIB_BITS);
#endif
#if !defined(QT_OPENGL_ES_2)
    glMatrixMode(GL_TEXTURE);
    glPushMatrix();
    glLoadIdentity();
    glMatrixMode(GL_PROJECTION);
    glPushMatrix();
    glMatrixMode(GL_MODELVIEW);
    glPushMatrix();

    glShadeModel(GL_FLAT);
    glDisable(GL_CULL_FACE);
    glDisable(GL_LIGHTING);
    glDisable(GL_STENCIL_TEST);
    glEnable(GL_BLEND);
    glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
#endif // !defined(QT_OPENGL_ES_2)
}

static void qt_restore_gl_state()
{
#if !defined(QT_OPENGL_ES_2)
    glMatrixMode(GL_TEXTURE);
    glPopMatrix();
    glMatrixMode(GL_PROJECTION);
    glPopMatrix();
    glMatrixMode(GL_MODELVIEW);
    glPopMatrix();
#endif // !defined(QT_OPENGL_ES_2)
#ifndef QT_OPENGL_ES
    glPopAttrib();
    glPopClientAttrib();
#endif
}

static void qt_gl_draw_text(QPainter *p, int x, int y, const QString &str,
                            const QFont &font)
{
    GLfloat color[4];
#ifndef QT_OPENGL_ES
    glGetFloatv(GL_CURRENT_COLOR, &color[0]);
#endif

    QColor col;
    col.setRgbF(color[0], color[1], color[2],color[3]);
    QPen old_pen = p->pen();
    QFont old_font = p->font();

    p->setPen(col);
    p->setFont(font);
    p->drawText(x, y, str);

    p->setPen(old_pen);
    p->setFont(old_font);
}

/*!
   Renders the string \a str into the GL context of this widget.

   \a x and \a y are specified in window coordinates, with the origin
   in the upper left-hand corner of the window. If \a font is not
   specified, the currently set application font will be used to
   render the string. To change the color of the rendered text you can
   use the glColor() call (or the qglColor() convenience function),
   just before the renderText() call.

   The \a listBase parameter is obsolete and will be removed in a
   future version of Qt.

   \note This function clears the stencil buffer.
*/

void QGLWidget::renderText(int x, int y, const QString &str, const QFont &font, int)
{
    Q_D(QGLWidget);
    if (str.isEmpty() || !isValid())
        return;

    GLint view[4];
#ifndef QT_OPENGL_ES
    bool use_scissor_testing = glIsEnabled(GL_SCISSOR_TEST);
    if (!use_scissor_testing)
        glGetIntegerv(GL_VIEWPORT, &view[0]);
#else
    bool use_scissor_testing = false;
#endif
    int width = d->glcx->device()->width();
    int height = d->glcx->device()->height();
    bool auto_swap = autoBufferSwap();

    QPaintEngine *engine = paintEngine();
    QPainter *p;
    bool reuse_painter = false;
    if (engine->isActive()) {
        reuse_painter = true;
        p = engine->painter();
        qt_save_gl_state();

#if !defined(QT_OPENGL_ES_2)
        glDisable(GL_DEPTH_TEST);
        glViewport(0, 0, width, height);
        glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
#ifndef QT_OPENGL_ES
        glOrtho(0, width, height, 0, 0, 1);
#else
        glOrthof(0, width, height, 0, 0, 1);
#endif
        glMatrixMode(GL_MODELVIEW);

        glLoadIdentity();
#endif // !defined(QT_OPENGL_ES_2)
    } else {
        setAutoBufferSwap(false);
        // disable glClear() as a result of QPainter::begin()
        d->glcx->d_func()->clear_on_painter_begin = false;
        p = new QPainter(this);
    }

    QRect viewport(view[0], view[1], view[2], view[3]);
    if (!use_scissor_testing && viewport != rect()) {
        // if the user hasn't set a scissor box, we set one that
        // covers the current viewport
        glScissor(view[0], view[1], view[2], view[3]);
        glEnable(GL_SCISSOR_TEST);
    } else if (use_scissor_testing) {
        // use the scissor box set by the user
        glEnable(GL_SCISSOR_TEST);
    }

    qt_gl_draw_text(p, x, y, str, font);

    if (reuse_painter) {
        qt_restore_gl_state();
    } else {
        p->end();
        delete p;
        setAutoBufferSwap(auto_swap);
        d->glcx->d_func()->clear_on_painter_begin = true;
    }
}

/*! \overload

    \a x, \a y and \a z are specified in scene or object coordinates
    relative to the currently set projection and model matrices. This
    can be useful if you want to annotate models with text labels and
    have the labels move with the model as it is rotated etc.
*/
void QGLWidget::renderText(double x, double y, double z, const QString &str, const QFont &font, int)
{
    Q_D(QGLWidget);
    if (str.isEmpty() || !isValid())
        return;

    bool auto_swap = autoBufferSwap();

    int width = d->glcx->device()->width();
    int height = d->glcx->device()->height();
    GLdouble model[4][4], proj[4][4];
    GLint view[4];
#ifndef QT_OPENGL_ES
    glGetDoublev(GL_MODELVIEW_MATRIX, &model[0][0]);
    glGetDoublev(GL_PROJECTION_MATRIX, &proj[0][0]);
    glGetIntegerv(GL_VIEWPORT, &view[0]);
#endif
    GLdouble win_x = 0, win_y = 0, win_z = 0;
    qgluProject(x, y, z, &model[0][0], &proj[0][0], &view[0],
                &win_x, &win_y, &win_z);
    win_y = height - win_y; // y is inverted

    QPaintEngine *engine = paintEngine();
    QPainter *p;
    bool reuse_painter = false;
#ifndef QT_OPENGL_ES
    bool use_depth_testing = glIsEnabled(GL_DEPTH_TEST);
    bool use_scissor_testing = glIsEnabled(GL_SCISSOR_TEST);
#else
    bool use_depth_testing = false;
    bool use_scissor_testing = false;
#endif

    if (engine->isActive()) {
        reuse_painter = true;
        p = engine->painter();
        qt_save_gl_state();
    } else {
        setAutoBufferSwap(false);
        // disable glClear() as a result of QPainter::begin()
        d->glcx->d_func()->clear_on_painter_begin = false;
        p = new QPainter(this);
    }

    QRect viewport(view[0], view[1], view[2], view[3]);
    if (!use_scissor_testing && viewport != rect()) {
        glScissor(view[0], view[1], view[2], view[3]);
        glEnable(GL_SCISSOR_TEST);
    } else if (use_scissor_testing) {
        glEnable(GL_SCISSOR_TEST);
    }
#if !defined(QT_OPENGL_ES_2)
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    glViewport(0, 0, width, height);
#ifndef QT_OPENGL_ES
    glOrtho(0, width, height, 0, 0, 1);
#else
    glOrthof(0, width, height, 0, 0, 1);
#endif
    glMatrixMode(GL_MODELVIEW);
    glLoadIdentity();
    glAlphaFunc(GL_GREATER, 0.0);
    glEnable(GL_ALPHA_TEST);
    if (use_depth_testing)
        glEnable(GL_DEPTH_TEST);
#ifndef QT_OPENGL_ES
    glTranslated(0, 0, -win_z);
#else
    glTranslatef(0, 0, -win_z);
#endif
#endif // !defined(QT_OPENGL_ES_2)
    qt_gl_draw_text(p, qRound(win_x), qRound(win_y), str, font);

    if (reuse_painter) {
        qt_restore_gl_state();
    } else {
        p->end();
        delete p;
        setAutoBufferSwap(auto_swap);
        d->glcx->d_func()->clear_on_painter_begin = true;
    }
}

QGLFormat QGLWidget::format() const
{
    Q_D(const QGLWidget);
    return d->glcx->format();
}

const QGLContext *QGLWidget::context() const
{
    Q_D(const QGLWidget);
    return d->glcx;
}

bool QGLWidget::doubleBuffer() const
{
    Q_D(const QGLWidget);
    return d->glcx->d_ptr->glFormat.testOption(QGL::DoubleBuffer);
}

void QGLWidget::setAutoBufferSwap(bool on)
{
    Q_D(QGLWidget);
    d->autoSwap = on;
}

bool QGLWidget::autoBufferSwap() const
{
    Q_D(const QGLWidget);
    return d->autoSwap;
}

/*!
    Calls QGLContext:::bindTexture(\a image, \a target, \a format) on the currently
    set context.

    \sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QImage &image, GLenum target, GLint format)
{
    Q_D(QGLWidget);
    return d->glcx->bindTexture(image, target, format);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
GLuint QGLWidget::bindTexture(const QImage &image, QMacCompatGLenum target, QMacCompatGLint format)
{
   Q_D(QGLWidget);
   return d->glcx->bindTexture(image, GLenum(target), GLint(format));
}
#endif

/*!
    Calls QGLContext:::bindTexture(\a pixmap, \a target, \a format) on the currently
    set context.

    \sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QPixmap &pixmap, GLenum target, GLint format)
{
    Q_D(QGLWidget);
    return d->glcx->bindTexture(pixmap, target, format);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
GLuint QGLWidget::bindTexture(const QPixmap &pixmap, QMacCompatGLenum target, QMacCompatGLint format)
{
    Q_D(QGLWidget);
    return d->glcx->bindTexture(pixmap, target, format);
}
#endif


/*! \overload

    Calls QGLContext::bindTexture(\a fileName) on the currently set context.

    \sa deleteTexture()
*/
GLuint QGLWidget::bindTexture(const QString &fileName)
{
    Q_D(QGLWidget);
    return d->glcx->bindTexture(fileName);
}

/*!
    Calls QGLContext::deleteTexture(\a id) on the currently set
    context.

    \sa bindTexture()
*/
void QGLWidget::deleteTexture(GLuint id)
{
    Q_D(QGLWidget);
    d->glcx->deleteTexture(id);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLWidget::deleteTexture(QMacCompatGLuint id)
{
    Q_D(QGLWidget);
    d->glcx->deleteTexture(GLuint(id));
}
#endif

/*!
    \since 4.4

    Draws the given texture, \a textureId to the given target rectangle,
    \a target, in OpenGL model space. The \a textureTarget should be a 2D
    texture target.

    Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLWidget::drawTexture(const QRectF &target, GLuint textureId, GLenum textureTarget)
{
    Q_D(QGLWidget);
    d->glcx->drawTexture(target, textureId, textureTarget);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLWidget::drawTexture(const QRectF &target, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    Q_D(QGLWidget);
    d->glcx->drawTexture(target, GLint(textureId), GLenum(textureTarget));
}
#endif

/*!
    \since 4.4

    Draws the given texture, \a textureId, at the given \a point in OpenGL
    model space. The \a textureTarget should be a 2D texture target.

    Equivalent to the corresponding QGLContext::drawTexture().
*/
void QGLWidget::drawTexture(const QPointF &point, GLuint textureId, GLenum textureTarget)
{
    Q_D(QGLWidget);
    d->glcx->drawTexture(point, textureId, textureTarget);
}

#ifdef Q_MAC_COMPAT_GL_FUNCTIONS
/*! \internal */
void QGLWidget::drawTexture(const QPointF &point, QMacCompatGLuint textureId, QMacCompatGLenum textureTarget)
{
    Q_D(QGLWidget);
    d->glcx->drawTexture(point, GLuint(textureId), GLenum(textureTarget));
}
#endif

#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
Q_GLOBAL_STATIC(QGL2PaintEngineEx, qt_gl_2_engine)
#endif

#ifndef QT_OPENGL_ES_2
Q_GLOBAL_STATIC(QOpenGLPaintEngine, qt_gl_engine)
#endif

#ifdef Q_WS_QWS
Q_OPENGL_EXPORT QPaintEngine* qt_qgl_paint_engine()
{
#if !defined(QT_OPENGL_ES_2)
    return qt_gl_engine();
#else
    return 0; // XXX
#endif
}
#endif

/*!
    \internal

    Returns the GL widget's paint engine. This is normally a
    QOpenGLPaintEngine.
*/
QPaintEngine *QGLWidget::paintEngine() const
{
#if defined(QT_OPENGL_ES_1) || defined(QT_OPENGL_ES_1_CL)
    return qt_gl_engine();
#elif defined(QT_OPENGL_ES_2)
    return qt_gl_2_engine();
#else
    if (!qt_gl_preferGL2Engine())
        return qt_gl_engine();
    else
        return qt_gl_2_engine();
#endif
}

#ifdef QT3_SUPPORT
/*!
    \overload
    \obsolete
 */
QGLWidget::QGLWidget(QWidget *parent, const char *name,
                      const QGLWidget* shareWidget, Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    if (name)
        setObjectName(QString::fromAscii(name));
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(new QGLContext(QGLFormat::defaultFormat(), this), shareWidget);
}

/*!
    \overload
    \obsolete
 */
QGLWidget::QGLWidget(const QGLFormat &format, QWidget *parent,
                      const char *name, const QGLWidget* shareWidget,
                      Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    if (name)
        setObjectName(QString::fromAscii(name));
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(new QGLContext(format, this), shareWidget);
}

/*!
    \overload
    \obsolete
 */
QGLWidget::QGLWidget(QGLContext *context, QWidget *parent,
                      const char *name, const QGLWidget *shareWidget, Qt::WindowFlags f)
    : QWidget(*(new QGLWidgetPrivate), parent, f | Qt::MSWindowsOwnDC)
{
    Q_D(QGLWidget);
    if (name)
        setObjectName(QString::fromAscii(name));
    setAttribute(Qt::WA_PaintOnScreen);
    setAttribute(Qt::WA_NoSystemBackground);
    setAutoFillBackground(true); // for compatibility
    d->init(context, shareWidget);
}

#endif // QT3_SUPPORT

void QGLExtensions::init_extensions()
{
    QString extensions = QLatin1String(reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS)));
    if (extensions.contains(QLatin1String("texture_rectangle")))
        glExtensions |= TextureRectangle;
    if (extensions.contains(QLatin1String("multisample")))
        glExtensions |= SampleBuffers;
    if (extensions.contains(QLatin1String("generate_mipmap")))
        glExtensions |= GenerateMipmap;
    if (extensions.contains(QLatin1String("texture_compression_s3tc")))
        glExtensions |= TextureCompression;
    if (extensions.contains(QLatin1String("ARB_fragment_program")))
        glExtensions |= FragmentProgram;
    if (extensions.contains(QLatin1String("mirrored_repeat")))
        glExtensions |= MirroredRepeat;
    if (extensions.contains(QLatin1String("EXT_framebuffer_object")))
        glExtensions |= FramebufferObject;
    if (extensions.contains(QLatin1String("EXT_stencil_two_side")))
        glExtensions |= StencilTwoSide;
    if (extensions.contains(QLatin1String("EXT_stencil_wrap")))
        glExtensions |= StencilWrap;
    if (extensions.contains(QLatin1String("EXT_packed_depth_stencil")))
        glExtensions |= PackedDepthStencil;
    if (extensions.contains(QLatin1String("GL_NV_float_buffer")))
        glExtensions |= NVFloatBuffer;
    if (extensions.contains(QLatin1String("ARB_pixel_buffer_object")))
        glExtensions |= PixelBufferObject;
#if defined(QT_OPENGL_ES_2)
    glExtensions |= FramebufferObject;
    glExtensions |= GenerateMipmap;
#endif
    if (extensions.contains(QLatin1String("EXT_framebuffer_blit")))
        glExtensions |= FramebufferBlit;

    QGLContext cx(QGLFormat::defaultFormat());
    if (glExtensions & TextureCompression) {
        qt_glCompressedTexImage2DARB = (pfn_glCompressedTexImage2DARB) cx.getProcAddress(QLatin1String("glCompressedTexImage2DARB"));
    }
}

/*
  This is the shared initialization for all platforms. Called from QGLWidgetPrivate::init()
*/
void QGLWidgetPrivate::initContext(QGLContext *context, const QGLWidget* shareWidget)
{
    Q_Q(QGLWidget);

    QGLExtensions::init();
    glcx = 0;
    autoSwap = true;

    if (context && !context->device())
        context->setDevice(q);
    q->setContext(context, shareWidget ? shareWidget->context() : 0);

    if (!glcx)
        glcx = new QGLContext(QGLFormat::defaultFormat(), q);

    q->setAttribute(Qt::WA_NoSystemBackground);
}

#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
Q_GLOBAL_STATIC(QString, qt_gl_lib_name)

Q_OPENGL_EXPORT void qt_set_gl_library_name(const QString& name)
{
    qt_gl_lib_name()->operator=(name);
}

Q_OPENGL_EXPORT const QString qt_gl_library_name()
{
    if (qt_gl_lib_name()->isNull()) {
#if defined(Q_WS_X11) || defined(Q_WS_QWS)
        return QLatin1String("GL");
#else // Q_WS_MAC
        return QLatin1String("/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib");
#endif
    }
    return *qt_gl_lib_name();
}
#endif

void QGLDrawable::setDevice(QPaintDevice *pdev)
{
    wasBound = false;
    widget = 0;
    buffer = 0;
    fbo = 0;
#ifdef Q_WS_QWS
    wsurf = 0;
#endif

#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    if (pdev->devType() == QInternal::Pixmap) {
        QPixmapData *data = static_cast<QPixmap *>(pdev)->pixmapData();
        Q_ASSERT(data->classId() == QPixmapData::OpenGLClass);
        pixmapData = static_cast<QGLPixmapData *>(data);

        fbo = pixmapData->fbo();
    }
#else
    Q_ASSERT(pdev->devType() != QInternal::Pixmap);
#endif

    if (pdev->devType() == QInternal::Widget)
        widget = static_cast<QGLWidget *>(pdev);
    else if (pdev->devType() == QInternal::Pbuffer)
        buffer = static_cast<QGLPixelBuffer *>(pdev);
    else if (pdev->devType() == QInternal::FramebufferObject)
        fbo = static_cast<QGLFramebufferObject *>(pdev);
#ifdef Q_WS_QWS
    else if (pdev->devType() == QInternal::UnknownDevice)
        wsurf = static_cast<QWSGLPaintDevice*>(pdev)->windowSurface();
#elif !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    else if (pdev->devType() == QInternal::UnknownDevice)
        wsurf = static_cast<QGLWindowSurface *>(pdev);
#endif
}

void QGLDrawable::swapBuffers()
{
    if (widget) {
        if (widget->autoBufferSwap())
            widget->swapBuffers();
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    } else if (pixmapData) {
        pixmapData->swapBuffers();
#endif
    } else {
        glFlush();
    }
}

void QGLDrawable::makeCurrent()
{
    previous_fbo = 0;
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    if (!pixmapData && !fbo) {
#else
    if (!fbo) {
#endif
        QGLContext *ctx = context();
        previous_fbo = ctx->d_ptr->current_fbo;
        ctx->d_ptr->current_fbo = 0;
        if (previous_fbo)
            glBindFramebuffer(GL_FRAMEBUFFER_EXT, 0);
    }

    if (widget)
        widget->makeCurrent();
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    else if (pixmapData)
        pixmapData->makeCurrent();
#endif
    else if (buffer)
        buffer->makeCurrent();
#if defined(Q_WS_QWS) || (!defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL))
    else if (wsurf)
        wsurf->context()->makeCurrent();
#endif
    else if (fbo) {
        wasBound = fbo->isBound();
        if (!wasBound)
            fbo->bind();
    }
}

#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
QGLPixmapData *QGLDrawable::copyOnBegin() const
{
    if (!pixmapData || pixmapData->isUninitialized())
        return 0;
    return pixmapData;
}
#endif

void QGLDrawable::doneCurrent()
{
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    if (pixmapData) {
        pixmapData->doneCurrent();
        return;
    }
#endif

    if (previous_fbo) {
        QGLContext *ctx = context();
        ctx->d_ptr->current_fbo = previous_fbo;
        glBindFramebuffer(GL_FRAMEBUFFER_EXT, previous_fbo);
    }

    if (fbo && !wasBound)
        fbo->release();
}

QSize QGLDrawable::size() const
{
    if (widget) {
        return QSize(widget->d_func()->glcx->device()->width(),
                     widget->d_func()->glcx->device()->height());
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    } else if (pixmapData) {
        return pixmapData->size();
#endif
    } else if (buffer) {
        return buffer->size();
    } else if (fbo) {
        return fbo->size();
    }
#ifdef Q_WS_QWS
    else if (wsurf)
        return wsurf->window()->frameSize();
#elif !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    else if (wsurf)
        return QSize(wsurf->width(), wsurf->height());
#endif
    return QSize();
}

QGLFormat QGLDrawable::format() const
{
    if (widget)
        return widget->format();
    else if (buffer)
        return buffer->format();
#if defined(Q_WS_QWS) || (!defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL))
    else if (wsurf)
        return wsurf->context()->format();
#endif
    else if (fbo && QGLContext::currentContext()) {
        QGLFormat fmt = QGLContext::currentContext()->format();
        fmt.setStencil(fbo->attachment() == QGLFramebufferObject::CombinedDepthStencil);
        fmt.setDepth(fbo->attachment() != QGLFramebufferObject::NoAttachment);
        return fmt;
    }

    return QGLFormat();
}

GLuint QGLDrawable::bindTexture(const QImage &image, GLenum target, GLint format)
{
    if (widget)
        return widget->d_func()->glcx->d_func()->bindTexture(image, target, format, true);
    else if (buffer)
        return buffer->d_func()->qctx->d_func()->bindTexture(image, target, format, true);
    else if (fbo && QGLContext::currentContext())
        return const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(image, target, format, true);
#if defined(Q_WS_QWS) || (!defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL))
    else if (wsurf)
        return wsurf->context()->d_func()->bindTexture(image, target, format, true);
#endif
    return 0;
}

GLuint QGLDrawable::bindTexture(const QPixmap &pixmap, GLenum target, GLint format)
{
    if (widget)
        return widget->d_func()->glcx->d_func()->bindTexture(pixmap, target, format, true);
    else if (buffer)
        return buffer->d_func()->qctx->d_func()->bindTexture(pixmap, target, format, true);
    else if (fbo && QGLContext::currentContext())
        return const_cast<QGLContext *>(QGLContext::currentContext())->d_func()->bindTexture(pixmap, target, format, true);
#if defined(Q_WS_QWS) || (!defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL))
    else if (wsurf)
        return wsurf->context()->d_func()->bindTexture(pixmap, target, format, true);
#endif
    return 0;
}

QColor QGLDrawable::backgroundColor() const
{
    if (widget)
        return widget->palette().brush(widget->backgroundRole()).color();
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    else if (pixmapData)
        return pixmapData->fillColor();
#endif
    return QApplication::palette().brush(QPalette::Background).color();
}

bool QGLDrawable::hasTransparentBackground() const
{
    return widget && widget->testAttribute(Qt::WA_TranslucentBackground);
}

QGLContext *QGLDrawable::context() const
{
    if (widget)
        return widget->d_func()->glcx;
    else if (buffer)
        return buffer->d_func()->qctx;
    else if (fbo)
        return const_cast<QGLContext *>(QGLContext::currentContext());
#if defined(Q_WS_QWS) || (!defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL))
    else if (wsurf)
        return wsurf->context();
#endif
    return 0;
}

bool QGLDrawable::autoFillBackground() const
{
    if (widget)
        return widget->autoFillBackground();
#if !defined(QT_OPENGL_ES_1) && !defined(QT_OPENGL_ES_1_CL)
    else if (pixmapData)
        return pixmapData->needsFill();
#endif
    else
        return false;
}

QT_END_NAMESPACE