48e0c4df23
Change-Id: Ic804938fc352291d011800d21e549c10acac66fb Reviewed-by: Lars Knoll <lars.knoll@digia.com>
367 lines
11 KiB
C++
367 lines
11 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the demonstration applications of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef GLBUFFERS_H
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#define GLBUFFERS_H
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//#include <GL/glew.h>
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#include "glextensions.h"
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#include <QtWidgets>
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#include <QtOpenGL>
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#define BUFFER_OFFSET(i) ((char*)0 + (i))
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#define SIZE_OF_MEMBER(cls, member) sizeof(static_cast<cls *>(0)->member)
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#define GLBUFFERS_ASSERT_OPENGL(prefix, assertion, returnStatement) \
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if (m_failed || !(assertion)) { \
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if (!m_failed) qCritical(prefix ": The necessary OpenGL functions are not available."); \
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m_failed = true; \
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returnStatement; \
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}
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void qgluPerspective(GLdouble fovy, GLdouble aspect, GLdouble zNear, GLdouble zFar);
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QT_BEGIN_NAMESPACE
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class QMatrix4x4;
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QT_END_NAMESPACE
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class GLTexture
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{
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public:
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GLTexture();
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virtual ~GLTexture();
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virtual void bind() = 0;
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virtual void unbind() = 0;
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virtual bool failed() const {return m_failed;}
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protected:
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GLuint m_texture;
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bool m_failed;
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};
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class GLFrameBufferObject
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{
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public:
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friend class GLRenderTargetCube;
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// friend class GLRenderTarget2D;
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GLFrameBufferObject(int width, int height);
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virtual ~GLFrameBufferObject();
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bool isComplete();
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virtual bool failed() const {return m_failed;}
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protected:
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void setAsRenderTarget(bool state = true);
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GLuint m_fbo;
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GLuint m_depthBuffer;
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int m_width, m_height;
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bool m_failed;
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};
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class GLTexture2D : public GLTexture
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{
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public:
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GLTexture2D(int width, int height);
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explicit GLTexture2D(const QString& fileName, int width = 0, int height = 0);
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void load(int width, int height, QRgb *data);
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virtual void bind();
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virtual void unbind();
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};
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class GLTexture3D : public GLTexture
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{
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public:
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GLTexture3D(int width, int height, int depth);
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// TODO: Implement function below
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//GLTexture3D(const QString& fileName, int width = 0, int height = 0);
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void load(int width, int height, int depth, QRgb *data);
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virtual void bind();
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virtual void unbind();
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};
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class GLTextureCube : public GLTexture
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{
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public:
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GLTextureCube(int size);
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explicit GLTextureCube(const QStringList& fileNames, int size = 0);
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void load(int size, int face, QRgb *data);
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virtual void bind();
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virtual void unbind();
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};
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// TODO: Define and implement class below
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//class GLRenderTarget2D : public GLTexture2D
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class GLRenderTargetCube : public GLTextureCube
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{
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public:
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GLRenderTargetCube(int size);
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// begin rendering to one of the cube's faces. 0 <= face < 6
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void begin(int face);
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// end rendering
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void end();
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virtual bool failed() const {return m_failed || m_fbo.failed();}
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static void getViewMatrix(QMatrix4x4& mat, int face);
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static void getProjectionMatrix(QMatrix4x4& mat, float nearZ, float farZ);
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private:
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GLFrameBufferObject m_fbo;
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};
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struct VertexDescription
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{
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enum
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{
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Null = 0, // Terminates a VertexDescription array
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Position,
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TexCoord,
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Normal,
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Color,
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};
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int field; // Position, TexCoord, Normal, Color
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int type; // GL_FLOAT, GL_UNSIGNED_BYTE
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int count; // number of elements
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int offset; // field's offset into vertex struct
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int index; // 0 (unused at the moment)
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};
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// Implementation of interleaved buffers.
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// 'T' is a struct which must include a null-terminated static array
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// 'VertexDescription* description'.
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// Example:
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/*
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struct Vertex
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{
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GLfloat position[3];
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GLfloat texCoord[2];
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GLfloat normal[3];
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GLbyte color[4];
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static VertexDescription description[];
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};
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VertexDescription Vertex::description[] = {
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{VertexDescription::Position, GL_FLOAT, SIZE_OF_MEMBER(Vertex, position) / sizeof(GLfloat), offsetof(Vertex, position), 0},
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{VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(Vertex, texCoord) / sizeof(GLfloat), offsetof(Vertex, texCoord), 0},
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{VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(Vertex, normal) / sizeof(GLfloat), offsetof(Vertex, normal), 0},
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{VertexDescription::Color, GL_BYTE, SIZE_OF_MEMBER(Vertex, color) / sizeof(GLbyte), offsetof(Vertex, color), 0},
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{VertexDescription::Null, 0, 0, 0, 0},
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};
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*/
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template<class T>
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class GLVertexBuffer
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{
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public:
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GLVertexBuffer(int length, const T *data = 0, int mode = GL_STATIC_DRAW)
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: m_length(0)
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, m_mode(mode)
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, m_buffer(0)
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, m_failed(false)
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::GLVertexBuffer", glGenBuffers && glBindBuffer && glBufferData, return)
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glGenBuffers(1, &m_buffer);
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glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
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glBufferData(GL_ARRAY_BUFFER, (m_length = length) * sizeof(T), data, mode);
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}
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~GLVertexBuffer()
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::~GLVertexBuffer", glDeleteBuffers, return)
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glDeleteBuffers(1, &m_buffer);
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}
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void bind()
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::bind", glBindBuffer, return)
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glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
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for (VertexDescription *desc = T::description; desc->field != VertexDescription::Null; ++desc) {
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switch (desc->field) {
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case VertexDescription::Position:
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glVertexPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
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glEnableClientState(GL_VERTEX_ARRAY);
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break;
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case VertexDescription::TexCoord:
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glTexCoordPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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break;
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case VertexDescription::Normal:
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glNormalPointer(desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
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glEnableClientState(GL_NORMAL_ARRAY);
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break;
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case VertexDescription::Color:
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glColorPointer(desc->count, desc->type, sizeof(T), BUFFER_OFFSET(desc->offset));
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glEnableClientState(GL_COLOR_ARRAY);
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break;
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default:
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break;
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}
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}
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}
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void unbind()
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::unbind", glBindBuffer, return)
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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for (VertexDescription *desc = T::description; desc->field != VertexDescription::Null; ++desc) {
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switch (desc->field) {
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case VertexDescription::Position:
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glDisableClientState(GL_VERTEX_ARRAY);
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break;
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case VertexDescription::TexCoord:
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glDisableClientState(GL_TEXTURE_COORD_ARRAY);
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break;
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case VertexDescription::Normal:
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glDisableClientState(GL_NORMAL_ARRAY);
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break;
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case VertexDescription::Color:
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glDisableClientState(GL_COLOR_ARRAY);
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break;
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default:
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break;
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}
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}
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}
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int length() const {return m_length;}
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T *lock()
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::lock", glBindBuffer && glMapBuffer, return 0)
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glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
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//glBufferData(GL_ARRAY_BUFFER, m_length, NULL, m_mode);
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GLvoid* buffer = glMapBuffer(GL_ARRAY_BUFFER, GL_READ_WRITE);
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m_failed = (buffer == 0);
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return reinterpret_cast<T *>(buffer);
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}
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void unlock()
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{
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GLBUFFERS_ASSERT_OPENGL("GLVertexBuffer::unlock", glBindBuffer && glUnmapBuffer, return)
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glBindBuffer(GL_ARRAY_BUFFER, m_buffer);
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glUnmapBuffer(GL_ARRAY_BUFFER);
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}
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bool failed()
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{
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return m_failed;
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}
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private:
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int m_length, m_mode;
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GLuint m_buffer;
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bool m_failed;
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};
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template<class T>
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class GLIndexBuffer
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{
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public:
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GLIndexBuffer(int length, const T *data = 0, int mode = GL_STATIC_DRAW)
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: m_length(0)
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, m_mode(mode)
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, m_buffer(0)
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, m_failed(false)
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::GLIndexBuffer", glGenBuffers && glBindBuffer && glBufferData, return)
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glGenBuffers(1, &m_buffer);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, (m_length = length) * sizeof(T), data, mode);
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}
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~GLIndexBuffer()
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::~GLIndexBuffer", glDeleteBuffers, return)
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glDeleteBuffers(1, &m_buffer);
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}
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void bind()
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::bind", glBindBuffer, return)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
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}
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void unbind()
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::unbind", glBindBuffer, return)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
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}
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int length() const {return m_length;}
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T *lock()
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::lock", glBindBuffer && glMapBuffer, return 0)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
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GLvoid* buffer = glMapBuffer(GL_ELEMENT_ARRAY_BUFFER, GL_READ_WRITE);
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m_failed = (buffer == 0);
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return reinterpret_cast<T *>(buffer);
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}
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void unlock()
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{
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GLBUFFERS_ASSERT_OPENGL("GLIndexBuffer::unlock", glBindBuffer && glUnmapBuffer, return)
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, m_buffer);
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glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
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}
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bool failed()
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{
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return m_failed;
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}
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private:
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int m_length, m_mode;
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GLuint m_buffer;
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bool m_failed;
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};
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#endif
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