120 lines
4 KiB
C++
120 lines
4 KiB
C++
/*****************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2006 Rivo Laks <rivolaks@hot.ee>
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You can Freely distribute this program under the GNU General Public
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License. See the file "COPYING" for the exact licensing terms.
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******************************************************************/
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#include "glutils.h"
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#include <dlfcn.h>
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namespace KWinInternal
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{
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// Variables
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// GL version, use MAKE_OPENGL_VERSION() macro for comparing with a specific version
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static int glVersion;
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// GLX version, use MAKE_GLX_VERSION() macro for comparing with a specific version
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static int glXVersion;
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// List of all supported GL and GLX extensions
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static QStringList glExtensions;
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int glTextureUnitsCount;
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// Function pointers
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glXGetProcAddress_func glXGetProcAddress;
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// texture_from_pixmap extension functions
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glXReleaseTexImageEXT_func glXReleaseTexImageEXT;
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glXBindTexImageEXT_func glXBindTexImageEXT;
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// glActiveTexture
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glActiveTexture_func glActiveTexture;
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// glXCopySubBufferMESA
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glXCopySubBuffer_func glXCopySubBuffer;
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// Functions
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static glXFuncPtr getProcAddress( const char* name )
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{
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glXFuncPtr ret = NULL;
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if( glXGetProcAddress != NULL )
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ret = glXGetProcAddress( ( const GLubyte* ) name );
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if( ret == NULL )
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ret = ( glXFuncPtr ) dlsym( RTLD_DEFAULT, name );
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return ret;
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}
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void initGLX()
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{
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// Get GLX version
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int major, minor;
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glXQueryVersion( display(), &major, &minor );
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glXVersion = MAKE_GLX_VERSION( major, minor, 0 );
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// Get list of supported GLX extensions. Simply add it to the list of OpenGL extensions.
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glExtensions += QString((const char*)glXQueryExtensionsString(
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display(), DefaultScreen( display()))).split(" ");
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// handle OpenGL extensions functions
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glXGetProcAddress = (glXGetProcAddress_func) getProcAddress( "glxGetProcAddress" );
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if( glXGetProcAddress == NULL )
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glXGetProcAddress = (glXGetProcAddress_func) getProcAddress( "glxGetProcAddressARB" );
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if( hasGLExtension( "GLX_EXT_texture_from_pixmap" ))
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{
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glXBindTexImageEXT = (glXBindTexImageEXT_func) getProcAddress( "glXBindTexImageEXT" );
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glXReleaseTexImageEXT = (glXReleaseTexImageEXT_func) getProcAddress( "glXReleaseTexImageEXT" );
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}
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else
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{
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glXBindTexImageEXT = NULL;
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glXReleaseTexImageEXT = NULL;
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}
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if( hasGLExtension( "GLX_MESA_copy_sub_buffer" ))
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glXCopySubBuffer = (glXCopySubBuffer_func) getProcAddress( "glXCopySubBufferMESA" );
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else
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glXCopySubBuffer = NULL;
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}
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void initGL()
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{
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// Get OpenGL version
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QString glversionstring = QString((const char*)glGetString(GL_VERSION));
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QStringList glversioninfo = glversionstring.left(glversionstring.indexOf(' ')).split('.');
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glVersion = MAKE_OPENGL_VERSION(glversioninfo[0].toInt(), glversioninfo[1].toInt(),
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glversioninfo.count() > 2 ? glversioninfo[2].toInt() : 0);
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// Get list of supported OpenGL extensions
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glExtensions = QString((const char*)glGetString(GL_EXTENSIONS)).split(" ");
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// handle OpenGL extensions functions
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if( hasGLExtension( "GL_ARB_multitexture" ))
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{
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glActiveTexture = (glActiveTexture_func) getProcAddress( "glActiveTexture" );
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if( !glActiveTexture )
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glActiveTexture = (glActiveTexture_func) getProcAddress( "glActiveTextureARB" );
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// Get number of texture units
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glGetIntegerv(GL_MAX_TEXTURE_UNITS, &glTextureUnitsCount);
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}
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else
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{
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glActiveTexture = NULL;
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glTextureUnitsCount = 0;
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}
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}
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bool hasGLVersion(int major, int minor, int release)
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{
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return glVersion >= MAKE_OPENGL_VERSION(major, minor, release);
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}
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bool hasGLXVersion(int major, int minor, int release)
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{
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return glXVersion >= MAKE_GLX_VERSION(major, minor, release);
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}
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bool hasGLExtension(const QString& extension)
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{
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return glExtensions.contains(extension);
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}
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} // namespace
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