summaryrefslogtreecommitdiffstats
path: root/demos/boxes/glbuffers.h
blob: c9e866d36f92b2670fd5226e2b9dbc9c5cdcd170 (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
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications 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 http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef GLBUFFERS_H
#define GLBUFFERS_H

//#include <GL/glew.h>
#include "glextensions.h"

#include <QtGui>
#include <QtOpenGL>

#include "vector.h"

#define BUFFER_OFFSET(i) ((char*)0 + (i))
#define SIZE_OF_MEMBER(cls, member) sizeof(static_cast<cls *>(0)->member)

#define GLBUFFERS_ASSERT_OPENGL(prefix, assertion, returnStatement)                         \
if (m_failed || !(assertion)) {                                                             \
    if (!m_failed) qCritical(prefix ": The necessary OpenGL functions are not available."); \
    m_failed = true;                                                                        \
    returnStatement;                                                                        \
}

class GLTexture
{
public:
    GLTexture();
    virtual ~GLTexture();
    virtual void bind() = 0;
    virtual void unbind() = 0;
    virtual bool failed() const {return m_failed;}
protected:
    GLuint m_texture;
    bool m_failed;
};

class GLFrameBufferObject
{
public:
    friend class GLRenderTargetCube;
    // friend class GLRenderTarget2D;

    GLFrameBufferObject(int width, int height);
    virtual ~GLFrameBufferObject();
    bool isComplete();
    virtual bool failed() const {return m_failed;}
protected:
    void setAsRenderTarget(bool state = true);
    GLuint m_fbo;
    GLuint m_depthBuffer;
    int m_width, m_height;
    bool m_failed;
};

class GLTexture2D : public GLTexture
{
public:
    GLTexture2D(int width, int height);
    GLTexture2D(const QString& fileName, int width = 0, int height = 0);
    void load(int width, int height, QRgb *data);
    virtual void bind();
    virtual void unbind();
};

class GLTexture3D : public GLTexture
{
public:
    GLTexture3D(int width, int height, int depth);
    // TODO: Implement function below
    //GLTexture3D(const QString& fileName, int width = 0, int height = 0);
    void load(int width, int height, int depth, QRgb *data);
    virtual void bind();
    virtual void unbind();
};

class GLTextureCube : public GLTexture
{
public:
    GLTextureCube(int size);
    GLTextureCube(const QStringList& fileNames, int size = 0);
    void load(int size, int face, QRgb *data);
    virtual void bind();
    virtual void unbind();
};

// TODO: Define and implement class below
//class GLRenderTarget2D : public GLTexture2D

class GLRenderTargetCube : public GLTextureCube
{
public:
    GLRenderTargetCube(int size);
    // begin rendering to one of the cube's faces. 0 <= face < 6
    void begin(int face);
    // end rendering
    void end();
    virtual bool failed() {return m_failed || m_fbo.failed();}

    static void getViewMatrix(gfx::Matrix4x4f& mat, int face);
    static void getProjectionMatrix(gfx::Matrix4x4f& mat, float nearZ, float farZ);
private:
    GLFrameBufferObject m_fbo;
};

struct VertexDescription
{
    enum
    {
        Null = 0, // Terminates a VertexDescription array
        Position,
        TexCoord,
        Normal,
        Color,
    };
    int field; // Position, TexCoord, Normal, Color
    int type; // GL_FLOAT, GL_UNSIGNED_BYTE
    int count; // number of elements
    int offset; // field's offset into vertex struct
    int index; // 0 (unused at the moment)
};

// Implementation of interleaved buffers.
// 'T' is a struct which must include a null-terminated static array
// 'VertexDescription* description'.
// Example:
/*
struct Vertex
{
    GLfloat position[3];
    GLfloat texCoord[2];
    GLfloat normal[3];
    GLbyte color[4];
    static VertexDescription description[];
};

VertexDescription Vertex::description[] = {
    {VertexDescription::Position, GL_FLOAT, SIZE_OF_MEMBER(Vertex, position) / sizeof(GLfloat), offsetof(Vertex, position), 0},
    {VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(Vertex, texCoord) / sizeof(GLfloat), offsetof(Vertex, texCoord), 0},
    {VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(Vertex, normal) / sizeof(GLfloat), offsetof(Vertex, normal), 0},
    {VertexDescription::Color, GL_BYTE, SIZE_OF_MEMBER(Vertex, color) / sizeof(GLbyte), offsetof(Vertex, color), 0},
    {VertexDescription::Null, 0, 0, 0, 0},
};
*/
template<class T>
class GLVertexBuffer
{
public:
    GLVertexBuffer(int length, const T *data = 0, int mode = GL_STATIC_DRAW)
        : m_length(0)
        , m_mode(mode)
        , m_buffer(0)
        , m_failed(false)
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::GLVertexBuffer", glGenBuffers && glBindBuffer && glBufferData, return)

		glGenBuffers(1, &m_buffer);
		glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
		glBufferData(GL_ARRAY_BUFFER, (m_length = length) * sizeof(T), data, mode);
    }

    ~GLVertexBuffer()
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::~GLVertexBuffer", glDeleteBuffers, return)

        glDeleteBuffers(1, &m_buffer);
    }

    void bind()
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::bind", glBindBuffer, return)

        glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
        for (VertexDescription *desc = T::description; desc->field != VertexDescription::Null; ++desc) {
            switch (desc->field) {
            case VertexDescription::Position:
                glVertexPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
                glEnableClientState(GL_VERTEX_ARRAY);
                break;
            case VertexDescription::TexCoord:
                glTexCoordPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
                glEnableClientState(GL_TEXTURE_COORD_ARRAY);
                break;
            case VertexDescription::Normal:
                glNormalPointer(desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
                glEnableClientState(GL_NORMAL_ARRAY);
                break;
            case VertexDescription::Color:
                glColorPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
                glEnableClientState(GL_COLOR_ARRAY);
                break;
            default:
                break;
            }
        }
    }

    void unbind()
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::unbind", glBindBuffer, return)

        glBindBuffer(GL_ARRAY_BUFFER, 0);
        for (VertexDescription *desc = T::description; desc->field != VertexDescription::Null; ++desc) {
            switch (desc->field) {
            case VertexDescription::Position:
                glDisableClientState(GL_VERTEX_ARRAY);
                break;
            case VertexDescription::TexCoord:
                glDisableClientState(GL_TEXTURE_COORD_ARRAY);
                break;
            case VertexDescription::Normal:
                glDisableClientState(GL_NORMAL_ARRAY);
                break;
            case VertexDescription::Color:
                glDisableClientState(GL_COLOR_ARRAY);
                break;
            default:
                break;
            }
        }
    }

    int length() const {return m_length;}

    T *lock()
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::lock", glBindBuffer && glMapBuffer, return 0)

        glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
        //glBufferData(GL_ARRAY_BUFFER, m_length, NULL, m_mode);
        GLvoid* buffer = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
        m_failed = (buffer == 0);
        return reinterpret_cast<T *>(buffer);
    }

    void unlock()
    {
        GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::unlock", glBindBuffer && glUnmapBuffer, return)

        glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
        glUnmapBuffer(GL_ARRAY_BUFFER);
    }

    bool failed()
    {
        return m_failed;
    }

private:
    int m_length, m_mode;
    GLuint m_buffer;
    bool m_failed;
};

template<class T>
class GLIndexBuffer
{
public:
    GLIndexBuffer(int length, const T *data = 0, int mode = GL_STATIC_DRAW)
        : m_length(0)
        , m_mode(mode)
        , m_buffer(0)
        , m_failed(false)
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::GLIndexBuffer", glGenBuffers && glBindBuffer && glBufferData, return)

        glGenBuffers(1, &m_buffer);
        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
        glBufferData(GL_ELEMENT_ARRAY_BUFFER, (m_length = length) * sizeof(T), data, mode);
    }

    ~GLIndexBuffer()
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::~GLIndexBuffer", glDeleteBuffers, return)

        glDeleteBuffers(1, &m_buffer);
    }

    void bind()
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::bind", glBindBuffer, return)

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
    }

    void unbind()
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::unbind", glBindBuffer, return)

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
    }

    int length() const {return m_length;}

    T *lock()
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::lock", glBindBuffer && glMapBuffer, return 0)

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
        GLvoid* buffer = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_WRITE);
        m_failed = (buffer == 0);
        return reinterpret_cast<T *>(buffer);
    }

    void unlock()
    {
        GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::unlock", glBindBuffer && glUnmapBuffer, return)

        glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
        glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
    }

    bool failed()
    {
        return m_failed;
    }

private:
    int m_length, m_mode;
    GLuint m_buffer;
    bool m_failed;
};

#endif