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<h1 class="title">glbuffers.h Example File</h1>
<span class="subtitle">graphicsview/boxes/glbuffers.h</span>
<!-- $$$graphicsview/boxes/glbuffers.h-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">
<span class="comment">/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** * Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in
** the documentation and/or other materials provided with the
** distribution.
** * Neither the name of The Qt Company Ltd nor the names of its
** contributors may be used to endorse or promote products derived
** from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/</span>
<span class="preprocessor">#ifndef GLBUFFERS_H</span>
<span class="preprocessor">#define GLBUFFERS_H</span>
<span class="comment">//#include <GL/glew.h></span>
<span class="preprocessor">#include "glextensions.h"</span>
<span class="preprocessor">#include <QtWidgets></span>
<span class="preprocessor">#include <QtOpenGL></span>
<span class="preprocessor">#define BUFFER_OFFSET(i) ((char*)0 + (i))</span>
<span class="preprocessor">#define SIZE_OF_MEMBER(cls, member) sizeof(static_cast<cls *>(0)->member)</span>
<span class="preprocessor">#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; \
}</span>
<span class="type">void</span> qgluPerspective(GLdouble fovy<span class="operator">,</span> GLdouble aspect<span class="operator">,</span> GLdouble zNear<span class="operator">,</span> GLdouble zFar);
<span class="keyword">class</span> QMatrix4x4;
<span class="keyword">class</span> GLTexture
{
<span class="keyword">public</span>:
GLTexture();
<span class="keyword">virtual</span> <span class="operator">~</span>GLTexture();
<span class="keyword">virtual</span> <span class="type">void</span> bind() <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">virtual</span> <span class="type">void</span> unbind() <span class="operator">=</span> <span class="number">0</span>;
<span class="keyword">virtual</span> bool failed() <span class="keyword">const</span> {<span class="keyword">return</span> m_failed;}
<span class="keyword">protected</span>:
GLuint m_texture;
bool m_failed;
};
<span class="keyword">class</span> GLFrameBufferObject
{
<span class="keyword">public</span>:
<span class="keyword">friend</span> <span class="keyword">class</span> GLRenderTargetCube;
<span class="comment">// friend class GLRenderTarget2D;</span>
GLFrameBufferObject(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height);
<span class="keyword">virtual</span> <span class="operator">~</span>GLFrameBufferObject();
bool isComplete();
<span class="keyword">virtual</span> bool failed() <span class="keyword">const</span> {<span class="keyword">return</span> m_failed;}
<span class="keyword">protected</span>:
<span class="type">void</span> setAsRenderTarget(bool state <span class="operator">=</span> <span class="keyword">true</span>);
GLuint m_fbo;
GLuint m_depthBuffer;
<span class="type">int</span> m_width<span class="operator">,</span> m_height;
bool m_failed;
};
<span class="keyword">class</span> GLTexture2D : <span class="keyword">public</span> GLTexture
{
<span class="keyword">public</span>:
GLTexture2D(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height);
<span class="keyword">explicit</span> GLTexture2D(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">&</span> fileName<span class="operator">,</span> <span class="type">int</span> width <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type">int</span> height <span class="operator">=</span> <span class="number">0</span>);
<span class="type">void</span> load(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>data);
<span class="type">void</span> bind() override;
<span class="type">void</span> unbind() override;
};
<span class="keyword">class</span> GLTexture3D : <span class="keyword">public</span> GLTexture
{
<span class="keyword">public</span>:
GLTexture3D(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height<span class="operator">,</span> <span class="type">int</span> depth);
<span class="comment">// TODO: Implement function below</span>
<span class="comment">//GLTexture3D(const QString& fileName, int width = 0, int height = 0);</span>
<span class="type">void</span> load(<span class="type">int</span> width<span class="operator">,</span> <span class="type">int</span> height<span class="operator">,</span> <span class="type">int</span> depth<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>data);
<span class="type">void</span> bind() override;
<span class="type">void</span> unbind() override;
};
<span class="keyword">class</span> GLTextureCube : <span class="keyword">public</span> GLTexture
{
<span class="keyword">public</span>:
GLTextureCube(<span class="type">int</span> size);
<span class="keyword">explicit</span> GLTextureCube(<span class="keyword">const</span> <span class="type"><a href="../qtcore/qstringlist.html">QStringList</a></span><span class="operator">&</span> fileNames<span class="operator">,</span> <span class="type">int</span> size <span class="operator">=</span> <span class="number">0</span>);
<span class="type">void</span> load(<span class="type">int</span> size<span class="operator">,</span> <span class="type">int</span> face<span class="operator">,</span> <span class="type"><a href="../qtgui/qcolor.html#QRgb-typedef">QRgb</a></span> <span class="operator">*</span>data);
<span class="type">void</span> bind() override;
<span class="type">void</span> unbind() override;
};
<span class="comment">// TODO: Define and implement class below</span>
<span class="comment">//class GLRenderTarget2D : public GLTexture2D</span>
<span class="keyword">class</span> GLRenderTargetCube : <span class="keyword">public</span> GLTextureCube
{
<span class="keyword">public</span>:
GLRenderTargetCube(<span class="type">int</span> size);
<span class="comment">// begin rendering to one of the cube's faces. 0 <= face < 6</span>
<span class="type">void</span> begin(<span class="type">int</span> face);
<span class="comment">// end rendering</span>
<span class="type">void</span> end();
bool failed() <span class="keyword">const</span> override { <span class="keyword">return</span> m_failed <span class="operator">|</span><span class="operator">|</span> m_fbo<span class="operator">.</span>failed(); }
<span class="keyword">static</span> <span class="type">void</span> getViewMatrix(QMatrix4x4<span class="operator">&</span> mat<span class="operator">,</span> <span class="type">int</span> face);
<span class="keyword">static</span> <span class="type">void</span> getProjectionMatrix(QMatrix4x4<span class="operator">&</span> mat<span class="operator">,</span> <span class="type">float</span> nearZ<span class="operator">,</span> <span class="type">float</span> farZ);
<span class="keyword">private</span>:
GLFrameBufferObject m_fbo;
};
<span class="keyword">struct</span> VertexDescription
{
<span class="keyword">enum</span>
{
Null <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="comment">// Terminates a VertexDescription array</span>
Position<span class="operator">,</span>
TexCoord<span class="operator">,</span>
Normal<span class="operator">,</span>
Color<span class="operator">,</span>
};
<span class="type">int</span> field; <span class="comment">// Position, TexCoord, Normal, Color</span>
<span class="type">int</span> type; <span class="comment">// GL_FLOAT, GL_UNSIGNED_BYTE</span>
<span class="type">int</span> count; <span class="comment">// number of elements</span>
<span class="type">int</span> offset; <span class="comment">// field's offset into vertex struct</span>
<span class="type">int</span> index; <span class="comment">// 0 (unused at the moment)</span>
};
<span class="comment">// Implementation of interleaved buffers.</span>
<span class="comment">// 'T' is a struct which must include a null-terminated static array</span>
<span class="comment">// 'VertexDescription* description'.</span>
<span class="comment">// Example:</span>
<span class="comment">/*
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},
};
*/</span>
<span class="keyword">template</span><span class="operator"><</span><span class="keyword">class</span> T<span class="operator">></span>
<span class="keyword">class</span> GLVertexBuffer
{
<span class="keyword">public</span>:
GLVertexBuffer(<span class="type">int</span> length<span class="operator">,</span> <span class="keyword">const</span> T <span class="operator">*</span>data <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type">int</span> mode <span class="operator">=</span> GL_STATIC_DRAW)
: m_length(<span class="number">0</span>)
<span class="operator">,</span> m_mode(mode)
<span class="operator">,</span> m_buffer(<span class="number">0</span>)
<span class="operator">,</span> m_failed(<span class="keyword">false</span>)
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::GLVertexBuffer"</span><span class="operator">,</span> glGenBuffers <span class="operator">&</span><span class="operator">&</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glBufferData<span class="operator">,</span> <span class="keyword">return</span>)
glGenBuffers(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>m_buffer);
glBindBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
glBufferData(GL_ARRAY_BUFFER<span class="operator">,</span> (m_length <span class="operator">=</span> length) <span class="operator">*</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> data<span class="operator">,</span> mode);
}
<span class="operator">~</span>GLVertexBuffer()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::~GLVertexBuffer"</span><span class="operator">,</span> glDeleteBuffers<span class="operator">,</span> <span class="keyword">return</span>)
glDeleteBuffers(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>m_buffer);
}
<span class="type">void</span> bind()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::bind"</span><span class="operator">,</span> glBindBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
<span class="keyword">for</span> (VertexDescription <span class="operator">*</span>desc <span class="operator">=</span> T<span class="operator">::</span>description; desc<span class="operator">-</span><span class="operator">></span>field <span class="operator">!</span><span class="operator">=</span> VertexDescription<span class="operator">::</span>Null; <span class="operator">+</span><span class="operator">+</span>desc) {
<span class="keyword">switch</span> (desc<span class="operator">-</span><span class="operator">></span>field) {
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Position:
glVertexPointer(desc<span class="operator">-</span><span class="operator">></span>count<span class="operator">,</span> desc<span class="operator">-</span><span class="operator">></span>type<span class="operator">,</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> BUFFER_OFFSET(desc<span class="operator">-</span><span class="operator">></span>offset));
glEnableClientState(GL_VERTEX_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>TexCoord:
glTexCoordPointer(desc<span class="operator">-</span><span class="operator">></span>count<span class="operator">,</span> desc<span class="operator">-</span><span class="operator">></span>type<span class="operator">,</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> BUFFER_OFFSET(desc<span class="operator">-</span><span class="operator">></span>offset));
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Normal:
glNormalPointer(desc<span class="operator">-</span><span class="operator">></span>type<span class="operator">,</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> BUFFER_OFFSET(desc<span class="operator">-</span><span class="operator">></span>offset));
glEnableClientState(GL_NORMAL_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Color:
glColorPointer(desc<span class="operator">-</span><span class="operator">></span>count<span class="operator">,</span> desc<span class="operator">-</span><span class="operator">></span>type<span class="operator">,</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> BUFFER_OFFSET(desc<span class="operator">-</span><span class="operator">></span>offset));
glEnableClientState(GL_COLOR_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
}
<span class="type">void</span> unbind()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::unbind"</span><span class="operator">,</span> glBindBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> <span class="number">0</span>);
<span class="keyword">for</span> (VertexDescription <span class="operator">*</span>desc <span class="operator">=</span> T<span class="operator">::</span>description; desc<span class="operator">-</span><span class="operator">></span>field <span class="operator">!</span><span class="operator">=</span> VertexDescription<span class="operator">::</span>Null; <span class="operator">+</span><span class="operator">+</span>desc) {
<span class="keyword">switch</span> (desc<span class="operator">-</span><span class="operator">></span>field) {
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Position:
glDisableClientState(GL_VERTEX_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>TexCoord:
glDisableClientState(GL_TEXTURE_COORD_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Normal:
glDisableClientState(GL_NORMAL_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">case</span> VertexDescription<span class="operator">::</span>Color:
glDisableClientState(GL_COLOR_ARRAY);
<span class="keyword">break</span>;
<span class="keyword">default</span>:
<span class="keyword">break</span>;
}
}
}
<span class="type">int</span> length() <span class="keyword">const</span> {<span class="keyword">return</span> m_length;}
T <span class="operator">*</span>lock()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::lock"</span><span class="operator">,</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glMapBuffer<span class="operator">,</span> <span class="keyword">return</span> <span class="number">0</span>)
glBindBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
<span class="comment">//glBufferData(GL_ARRAY_BUFFER, m_length, NULL, m_mode);</span>
GLvoid<span class="operator">*</span> buffer <span class="operator">=</span> glMapBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> GL_READ_WRITE);
m_failed <span class="operator">=</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">return</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span>T <span class="operator">*</span><span class="operator">></span>(buffer);
}
<span class="type">void</span> unlock()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLVertexBuffer::unlock"</span><span class="operator">,</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glUnmapBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
glUnmapBuffer(GL_ARRAY_BUFFER);
}
bool failed()
{
<span class="keyword">return</span> m_failed;
}
<span class="keyword">private</span>:
<span class="type">int</span> m_length<span class="operator">,</span> m_mode;
GLuint m_buffer;
bool m_failed;
};
<span class="keyword">template</span><span class="operator"><</span><span class="keyword">class</span> T<span class="operator">></span>
<span class="keyword">class</span> GLIndexBuffer
{
<span class="keyword">public</span>:
GLIndexBuffer(<span class="type">int</span> length<span class="operator">,</span> <span class="keyword">const</span> T <span class="operator">*</span>data <span class="operator">=</span> <span class="number">0</span><span class="operator">,</span> <span class="type">int</span> mode <span class="operator">=</span> GL_STATIC_DRAW)
: m_length(<span class="number">0</span>)
<span class="operator">,</span> m_mode(mode)
<span class="operator">,</span> m_buffer(<span class="number">0</span>)
<span class="operator">,</span> m_failed(<span class="keyword">false</span>)
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::GLIndexBuffer"</span><span class="operator">,</span> glGenBuffers <span class="operator">&</span><span class="operator">&</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glBufferData<span class="operator">,</span> <span class="keyword">return</span>)
glGenBuffers(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>m_buffer);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
glBufferData(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> (m_length <span class="operator">=</span> length) <span class="operator">*</span> <span class="keyword">sizeof</span>(T)<span class="operator">,</span> data<span class="operator">,</span> mode);
}
<span class="operator">~</span>GLIndexBuffer()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::~GLIndexBuffer"</span><span class="operator">,</span> glDeleteBuffers<span class="operator">,</span> <span class="keyword">return</span>)
glDeleteBuffers(<span class="number">1</span><span class="operator">,</span> <span class="operator">&</span>m_buffer);
}
<span class="type">void</span> bind()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::bind"</span><span class="operator">,</span> glBindBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
}
<span class="type">void</span> unbind()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::unbind"</span><span class="operator">,</span> glBindBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> <span class="number">0</span>);
}
<span class="type">int</span> length() <span class="keyword">const</span> {<span class="keyword">return</span> m_length;}
T <span class="operator">*</span>lock()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::lock"</span><span class="operator">,</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glMapBuffer<span class="operator">,</span> <span class="keyword">return</span> <span class="number">0</span>)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
GLvoid<span class="operator">*</span> buffer <span class="operator">=</span> glMapBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> GL_READ_WRITE);
m_failed <span class="operator">=</span> (buffer <span class="operator">=</span><span class="operator">=</span> <span class="number">0</span>);
<span class="keyword">return</span> <span class="keyword">reinterpret_cast</span><span class="operator"><</span>T <span class="operator">*</span><span class="operator">></span>(buffer);
}
<span class="type">void</span> unlock()
{
GLBUFFERS_ASSERT_OPENGL(<span class="string">"GLIndexBuffer::unlock"</span><span class="operator">,</span> glBindBuffer <span class="operator">&</span><span class="operator">&</span> glUnmapBuffer<span class="operator">,</span> <span class="keyword">return</span>)
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER<span class="operator">,</span> m_buffer);
glUnmapBuffer(GL_ELEMENT_ARRAY_BUFFER);
}
bool failed()
{
<span class="keyword">return</span> m_failed;
}
<span class="keyword">private</span>:
<span class="type">int</span> m_length<span class="operator">,</span> m_mode;
GLuint m_buffer;
bool m_failed;
};
<span class="preprocessor">#endif</span>
</pre>
</div>
<!-- @@@graphicsview/boxes/glbuffers.h -->
</div>
</div>
</div>
</div>
</div>
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distrib
>
Mageia
>
7
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
d5e62c01ae8d1e579463c6a871dd44bf
>
files
>
4386
