Enable QtOpenGL vector path caching on Symbian/IVE3

IVE3 doesn't support UNSIGNED_INT <type> index values in DrawElements.
This patch checks if GL_OES_element_index_uint extensions is
supported and determines DrawElement indices type based on that.
On desktop environment UNSIGNED_INT is always supported.

Task-number: QTBUG-13563
Reviewed-by: Gunnar

1 files changed, 14 insertions, 0 deletions

diff --git a/src/opengl/qglextensions_p.h b/src/opengl/qglextensions_p.h
index 6259cca..e81e849 100644
--- a/src/opengl/qglextensions_p.h
+++ b/src/opengl/qglextensions_p.h
@@ -346,6 +346,17 @@ struct QGLExtensionFuncs
         qt_glEGLImageTargetTexture2DOES = 0;
         qt_glEGLImageTargetRenderbufferStorageOES = 0;
 #endif
+
+        // OES_element_index_uint
+#if !defined(QT_OPENGL_ES)
+        qt_glSupportsElementIndexUint = true;
+#else
+        QString extensions = reinterpret_cast<const char *>(glGetString(GL_EXTENSIONS));
+        if (extensions.contains("GL_OES_element_index_uint"))
+            qt_glSupportsElementIndexUint = true;
+        else
+            qt_glSupportsElementIndexUint = false;
+#endif
     }
 
 
@@ -473,6 +484,7 @@ struct QGLExtensionFuncs
     _glEGLImageTargetRenderbufferStorageOES qt_glEGLImageTargetRenderbufferStorageOES;
 #endif
 
+    bool qt_glSupportsElementIndexUint;
 };
 
 
@@ -871,6 +883,8 @@ struct QGLExtensionFuncs
 #define glEGLImageTargetRenderbufferStorageOES QGLContextPrivate::extensionFuncs(ctx).qt_glEGLImageTargetRenderbufferStorageOES
 #endif
 
+#define glSupportsElementIndexUint  QGLContextPrivate::extensionFuncs(ctx).qt_glSupportsElementIndexUint
+
 extern bool qt_resolve_framebufferobject_extensions(QGLContext *ctx);
 bool qt_resolve_buffer_extensions(QGLContext *ctx);