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 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
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 ** This file is part of the demonstration applications of the Qt Toolkit.
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 #include &quot;glbuffers.h&quot;
 #include &lt;QtGui/qmatrix4x4.h&gt;

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                                  GLTexture                                 //</span>
<span class="comment"> //============================================================================//</span>

 GLTexture::GLTexture() : m_texture(0), m_failed(false)
 {
     glGenTextures(1, &amp;m_texture);
 }

 GLTexture::~GLTexture()
 {
     glDeleteTextures(1, &amp;m_texture);
 }

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                                 GLTexture2D                                //</span>
<span class="comment"> //============================================================================//</span>

 GLTexture2D::GLTexture2D(int width, int height)
 {
     glBindTexture(GL_TEXTURE_2D, m_texture);
     glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
         GL_BGRA, GL_UNSIGNED_BYTE, 0);

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     <span class="comment">//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);</span>
     <span class="comment">//glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);</span>
     glBindTexture(GL_TEXTURE_2D, 0);
 }

 GLTexture2D::GLTexture2D(const QString&amp; fileName, int width, int height)
 {
     <span class="comment">// TODO: Add error handling.</span>
     QImage image(fileName);

     if (image.isNull()) {
         m_failed = true;
         return;
     }

     image = image.convertToFormat(QImage::Format_ARGB32);

     <span class="comment">//qDebug() &lt;&lt; &quot;Image size:&quot; &lt;&lt; image.width() &lt;&lt; &quot;x&quot; &lt;&lt; image.height();</span>
     if (width &lt;= 0)
         width = image.width();
     if (height &lt;= 0)
         height = image.height();
     if (width != image.width() || height != image.height())
         image = image.scaled(width, height, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

     glBindTexture(GL_TEXTURE_2D, m_texture);

     <span class="comment">// Works on x86, so probably works on all little-endian systems.</span>
     <span class="comment">// Does it work on big-endian systems?</span>
     glTexImage2D(GL_TEXTURE_2D, 0, 4, image.width(), image.height(), 0,
         GL_BGRA, GL_UNSIGNED_BYTE, image.bits());

     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     <span class="comment">//glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);</span>
     <span class="comment">//glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);</span>
     glBindTexture(GL_TEXTURE_2D, 0);
 }

 void GLTexture2D::load(int width, int height, QRgb *data)
 {
     glBindTexture(GL_TEXTURE_2D, m_texture);
     glTexImage2D(GL_TEXTURE_2D, 0, 4, width, height, 0,
         GL_BGRA, GL_UNSIGNED_BYTE, data);
     glBindTexture(GL_TEXTURE_2D, 0);
 }

 void GLTexture2D::bind()
 {
     glBindTexture(GL_TEXTURE_2D, m_texture);
     glEnable(GL_TEXTURE_2D);
 }

 void GLTexture2D::unbind()
 {
     glBindTexture(GL_TEXTURE_2D, 0);
     glDisable(GL_TEXTURE_2D);
 }

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                                 GLTexture3D                                //</span>
<span class="comment"> //============================================================================//</span>

 GLTexture3D::GLTexture3D(int width, int height, int depth)
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLTexture3D::GLTexture3D&quot;, glTexImage3D, return)

     glBindTexture(GL_TEXTURE_3D, m_texture);
     glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
         GL_BGRA, GL_UNSIGNED_BYTE, 0);

     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_REPEAT);
     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     <span class="comment">//glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);</span>
     <span class="comment">//glTexParameteri(GL_TEXTURE_3D, GL_GENERATE_MIPMAP, GL_TRUE);</span>
     glBindTexture(GL_TEXTURE_3D, 0);
 }

 void GLTexture3D::load(int width, int height, int depth, QRgb *data)
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLTexture3D::load&quot;, glTexImage3D, return)

     glBindTexture(GL_TEXTURE_3D, m_texture);
     glTexImage3D(GL_TEXTURE_3D, 0, 4, width, height, depth, 0,
         GL_BGRA, GL_UNSIGNED_BYTE, data);
     glBindTexture(GL_TEXTURE_3D, 0);
 }

 void GLTexture3D::bind()
 {
     glBindTexture(GL_TEXTURE_3D, m_texture);
     glEnable(GL_TEXTURE_3D);
 }

 void GLTexture3D::unbind()
 {
     glBindTexture(GL_TEXTURE_3D, 0);
     glDisable(GL_TEXTURE_3D);
 }

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                                GLTextureCube                               //</span>
<span class="comment"> //============================================================================//</span>

 GLTextureCube::GLTextureCube(int size)
 {
     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

     for (int i = 0; i &lt; 6; ++i)
         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 4, size, size, 0,
             GL_BGRA, GL_UNSIGNED_BYTE, 0);

     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     <span class="comment">//glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);</span>
     <span class="comment">//glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);</span>
     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
 }

 GLTextureCube::GLTextureCube(const QStringList&amp; fileNames, int size)
 {
     <span class="comment">// TODO: Add error handling.</span>

     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);

     int index = 0;
     foreach (QString file, fileNames) {
         QImage image(file);
         if (image.isNull()) {
             m_failed = true;
             break;
         }

         image = image.convertToFormat(QImage::Format_ARGB32);

         <span class="comment">//qDebug() &lt;&lt; &quot;Image size:&quot; &lt;&lt; image.width() &lt;&lt; &quot;x&quot; &lt;&lt; image.height();</span>
         if (size &lt;= 0)
             size = image.width();
         if (size != image.width() || size != image.height())
             image = image.scaled(size, size, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);

         <span class="comment">// Works on x86, so probably works on all little-endian systems.</span>
         <span class="comment">// Does it work on big-endian systems?</span>
         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, image.width(), image.height(), 0,
             GL_BGRA, GL_UNSIGNED_BYTE, image.bits());

         if (++index == 6)
             break;
     }

     <span class="comment">// Clear remaining faces.</span>
     while (index &lt; 6) {
         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + index, 0, 4, size, size, 0,
             GL_BGRA, GL_UNSIGNED_BYTE, 0);
         ++index;
     }

     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
     glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
     <span class="comment">//glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);</span>
     <span class="comment">//glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_GENERATE_MIPMAP, GL_TRUE);</span>
     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
 }

 void GLTextureCube::load(int size, int face, QRgb *data)
 {
     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
         glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, 0, 4, size, size, 0,
             GL_BGRA, GL_UNSIGNED_BYTE, data);
     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
 }

 void GLTextureCube::bind()
 {
     glBindTexture(GL_TEXTURE_CUBE_MAP, m_texture);
     glEnable(GL_TEXTURE_CUBE_MAP);
 }

 void GLTextureCube::unbind()
 {
     glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
     glDisable(GL_TEXTURE_CUBE_MAP);
 }

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                            GLFrameBufferObject                             //</span>
<span class="comment"> //============================================================================//</span>

 GLFrameBufferObject::GLFrameBufferObject(int width, int height)
     : m_fbo(0)
     , m_depthBuffer(0)
     , m_width(width)
     , m_height(height)
     , m_failed(false)
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLFrameBufferObject::GLFrameBufferObject&quot;,
         glGenFramebuffersEXT &amp;&amp; glGenRenderbuffersEXT &amp;&amp; glBindRenderbufferEXT &amp;&amp; glRenderbufferStorageEXT, return)

     <span class="comment">// TODO: share depth buffers of same size</span>
     glGenFramebuffersEXT(1, &amp;m_fbo);
     <span class="comment">//glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);</span>
     glGenRenderbuffersEXT(1, &amp;m_depthBuffer);
     glBindRenderbufferEXT(GL_RENDERBUFFER_EXT, m_depthBuffer);
     glRenderbufferStorageEXT(GL_RENDERBUFFER_EXT, GL_DEPTH_COMPONENT, m_width, m_height);
     <span class="comment">//glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_depthBuffer);</span>
     <span class="comment">//glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);</span>
 }

 GLFrameBufferObject::~GLFrameBufferObject()
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLFrameBufferObject::~GLFrameBufferObject&quot;,
         glDeleteFramebuffersEXT &amp;&amp; glDeleteRenderbuffersEXT, return)

     glDeleteFramebuffersEXT(1, &amp;m_fbo);
     glDeleteRenderbuffersEXT(1, &amp;m_depthBuffer);
 }

 void GLFrameBufferObject::setAsRenderTarget(bool state)
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLFrameBufferObject::setAsRenderTarget&quot;, glBindFramebufferEXT, return)

     if (state) {
         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, m_fbo);
         glPushAttrib(GL_VIEWPORT_BIT);
         glViewport(0, 0, m_width, m_height);
     } else {
         glPopAttrib();
         glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
     }
 }

 bool GLFrameBufferObject::isComplete()
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLFrameBufferObject::isComplete&quot;, glCheckFramebufferStatusEXT, return false)

     return GL_FRAMEBUFFER_COMPLETE_EXT == glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
 }

<span class="comment"> //============================================================================//</span>
<span class="comment"> //                             GLRenderTargetCube                             //</span>
<span class="comment"> //============================================================================//</span>

 GLRenderTargetCube::GLRenderTargetCube(int size)
     : GLTextureCube(size)
     , m_fbo(size, size)
 {
 }

 void GLRenderTargetCube::begin(int face)
 {
     GLBUFFERS_ASSERT_OPENGL(&quot;GLRenderTargetCube::begin&quot;,
         glFramebufferTexture2DEXT &amp;&amp; glFramebufferRenderbufferEXT, return)

     m_fbo.setAsRenderTarget(true);
     glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT,
         GL_TEXTURE_CUBE_MAP_POSITIVE_X + face, m_texture, 0);
     glFramebufferRenderbufferEXT(GL_FRAMEBUFFER_EXT, GL_DEPTH_ATTACHMENT_EXT, GL_RENDERBUFFER_EXT, m_fbo.m_depthBuffer);
 }

 void GLRenderTargetCube::end()
 {
     m_fbo.setAsRenderTarget(false);
 }

 void GLRenderTargetCube::getViewMatrix(QMatrix4x4&amp; mat, int face)
 {
     if (face &lt; 0 || face &gt;= 6) {
         qWarning(&quot;GLRenderTargetCube::getViewMatrix: 'face' must be in the range [0, 6). (face == %d)&quot;, face);
         return;
     }

     static int perm[6][3] = {
         {2, 1, 0},
         {2, 1, 0},
         {0, 2, 1},
         {0, 2, 1},
         {0, 1, 2},
         {0, 1, 2},
     };

     static float signs[6][3] = {
         {-1.0f, -1.0f, -1.0f},
         {+1.0f, -1.0f, +1.0f},
         {+1.0f, +1.0f, -1.0f},
         {+1.0f, -1.0f, +1.0f},
         {+1.0f, -1.0f, -1.0f},
         {-1.0f, -1.0f, +1.0f},
     };

     mat.fill(0.0f);
     for (int i = 0; i &lt; 3; ++i)
         mat(i, perm[face][i]) = signs[face][i];
     mat(3, 3) = 1.0f;
 }

 void GLRenderTargetCube::getProjectionMatrix(QMatrix4x4&amp; mat, float nearZ, float farZ)
 {
     static const QMatrix4x4 reference(
             1.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 1.0f, 0.0f, 0.0f,
             0.0f, 0.0f, 0.0f, 0.0f,
             0.0f, 0.0f, -1.0f, 0.0f);

     mat = reference;
     mat(2, 2) = (nearZ+farZ)/(nearZ-farZ);
     mat(2, 3) = 2.0f*nearZ*farZ/(nearZ-farZ);
 }</pre>
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