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Diffstat (limited to 'examples/graphicsview/boxes/glbuffers.h')
| -rw-r--r-- | examples/graphicsview/boxes/glbuffers.h | 366 |
1 files changed, 366 insertions, 0 deletions
diff --git a/examples/graphicsview/boxes/glbuffers.h b/examples/graphicsview/boxes/glbuffers.h new file mode 100644 index 0000000000..1a53fa2c1a --- /dev/null +++ b/examples/graphicsview/boxes/glbuffers.h @@ -0,0 +1,366 @@ +/**************************************************************************** +** +** 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. +** +** $QT_BEGIN_LICENSE:LGPL$ +** GNU Lesser General Public License Usage +** 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. +** +** 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. +** +** Other Usage +** Alternatively, this file may be used in accordance with the terms and +** conditions contained in a signed written agreement between you and Nokia. +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef GLBUFFERS_H +#define GLBUFFERS_H + +//#include <GL/glew.h> +#include "glextensions.h" + +#include <QtWidgets> +#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 |