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Branched from the monolithic repo, Qt master branch, at commit
896db169ea224deb96c59ce8af800d019de63f12

1 files changed, 366 insertions, 0 deletions

diff --git a/demos/boxes/glbuffers.h b/demos/boxes/glbuffers.h
new file mode 100644
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+++ b/demos/boxes/glbuffers.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef GLBUFFERS_H
+#define GLBUFFERS_H
+
+//#include <GL/glew.h>
+#include "glextensions.h"
+
+#include <QtGui>
+#include <QtOpenGL>
+
+#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;                                                                        \
+}
+
+void qgluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);
+
+QT_BEGIN_NAMESPACE
+class QMatrix4x4;
+QT_END_NAMESPACE
+
+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(QMatrix4x4& mat, int face);
+    static void getProjectionMatrix(QMatrix4x4& 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