workspace/kwin/lib/kwinglutils_funcs.cpp

   1 /********************************************************************
   2  KWin - the KDE window manager
   3  This file is part of the KDE project.
   4
   5 Copyright (C) 2007 Rivo Laks <rivolaks@hot.ee>
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 *********************************************************************/
  20
  21 #include "kwinglutils.h"
  22
  23 #include <dlfcn.h>
  24
  25
  26 // Resolves given function, using getProcAddress
  27 #define GL_RESOLVE( function )  function = (function ## _func)getProcAddress( #function );
  28 // Same as above but tries to use function "backup" if "function" doesn't exist
  29 // Useful when same functionality is also defined in an extension
  30 #define GL_RESOLVE_WITH_EXT( function, backup ) \
  31   function = (function ## _func)getProcAddress( #function ); \
  32   if( !function ) \
  33     function = (function ## _func)getProcAddress( #backup );
  34
  35 #ifdef KWIN_HAVE_OPENGL
  36
  37 namespace KWin
  38 {
  39
  40 // Function pointers
  41 glXGetProcAddress_func glXGetProcAddress;
  42 // GLX 1.3
  43 glXQueryDrawable_func glXQueryDrawable;
  44 // texture_from_pixmap extension functions
  45 glXReleaseTexImageEXT_func glXReleaseTexImageEXT;
  46 glXBindTexImageEXT_func glXBindTexImageEXT;
  47 // glXCopySubBufferMESA
  48 glXCopySubBuffer_func glXCopySubBuffer;
  49 // video_sync extension functions
  50 glXGetVideoSync_func glXGetVideoSync;
  51 glXWaitVideoSync_func glXWaitVideoSync;
  52 // GLX_SGIX_fbconfig
  53 glXGetFBConfigAttrib_func glXGetFBConfigAttrib;
  54 glXGetVisualFromFBConfig_func glXGetVisualFromFBConfig;
  55 glXCreateWindow_func glXCreateWindow;
  56 glXDestroyWindow_func glXDestroyWindow;
  57 glXCreatePixmap_func glXCreatePixmap;
  58 glXDestroyPixmap_func glXDestroyPixmap;
  59 glXGetFBConfigs_func glXGetFBConfigs;
  60
  61 // glActiveTexture
  62 glActiveTexture_func glActiveTexture;
  63 // framebuffer_object extension functions
  64 glIsRenderbuffer_func glIsRenderbuffer;
  65 glBindRenderbuffer_func glBindRenderbuffer;
  66 glDeleteRenderbuffers_func glDeleteRenderbuffers;
  67 glGenRenderbuffers_func glGenRenderbuffers;
  68 glRenderbufferStorage_func glRenderbufferStorage;
  69 glGetRenderbufferParameteriv_func glGetRenderbufferParameteriv;
  70 glIsFramebuffer_func glIsFramebuffer;
  71 glBindFramebuffer_func glBindFramebuffer;
  72 glDeleteFramebuffers_func glDeleteFramebuffers;
  73 glGenFramebuffers_func glGenFramebuffers;
  74 glCheckFramebufferStatus_func glCheckFramebufferStatus;
  75 glFramebufferTexture1D_func glFramebufferTexture1D;
  76 glFramebufferTexture2D_func glFramebufferTexture2D;
  77 glFramebufferTexture3D_func glFramebufferTexture3D;
  78 glFramebufferRenderbuffer_func glFramebufferRenderbuffer;
  79 glGetFramebufferAttachmentParameteriv_func glGetFramebufferAttachmentParameteriv;
  80 glGenerateMipmap_func glGenerateMipmap;
  81 // Shader functions
  82 glCreateShader_func glCreateShader;
  83 glShaderSource_func glShaderSource;
  84 glCompileShader_func glCompileShader;
  85 glDeleteShader_func glDeleteShader;
  86 glCreateProgram_func glCreateProgram;
  87 glAttachShader_func glAttachShader;
  88 glLinkProgram_func glLinkProgram;
  89 glUseProgram_func glUseProgram;
  90 glDeleteProgram_func glDeleteProgram;
  91 glGetShaderInfoLog_func glGetShaderInfoLog;
  92 glGetProgramInfoLog_func glGetProgramInfoLog;
  93 glGetProgramiv_func glGetProgramiv;
  94 glGetShaderiv_func glGetShaderiv;
  95 glUniform1f_func glUniform1f;
  96 glUniform1i_func glUniform1i;
  97 glUniform1fv_func glUniform1fv;
  98 glUniform2fv_func glUniform2fv;
  99 glValidateProgram_func glValidateProgram;
 100 glGetUniformLocation_func glGetUniformLocation;
 101 glVertexAttrib1f_func glVertexAttrib1f;
 102 glGetAttribLocation_func glGetAttribLocation;
 103
 104
 105 static glXFuncPtr getProcAddress( const char* name )
 106     {
 107     glXFuncPtr ret = NULL;
 108     if( glXGetProcAddress != NULL )
 109         ret = glXGetProcAddress( ( const GLubyte* ) name );
 110     if( ret == NULL )
 111         ret = ( glXFuncPtr ) dlsym( RTLD_DEFAULT, name );
 112     return ret;
 113     }
 114
 115 void glxResolveFunctions()
 116     {
 117     // handle OpenGL extensions functions
 118     glXGetProcAddress = (glXGetProcAddress_func) getProcAddress( "glXGetProcAddress" );
 119     if( glXGetProcAddress == NULL )
 120         glXGetProcAddress = (glXGetProcAddress_func) getProcAddress( "glXGetProcAddressARB" );
 121     glXQueryDrawable = (glXQueryDrawable_func) getProcAddress( "glXQueryDrawable" );
 122     if( hasGLExtension( "GLX_EXT_texture_from_pixmap" ))
 123         {
 124         glXBindTexImageEXT = (glXBindTexImageEXT_func) getProcAddress( "glXBindTexImageEXT" );
 125         glXReleaseTexImageEXT = (glXReleaseTexImageEXT_func) getProcAddress( "glXReleaseTexImageEXT" );
 126         }
 127     else
 128         {
 129         glXBindTexImageEXT = NULL;
 130         glXReleaseTexImageEXT = NULL;
 131         }
 132     if( hasGLExtension( "GLX_MESA_copy_sub_buffer" ))
 133         glXCopySubBuffer = (glXCopySubBuffer_func) getProcAddress( "glXCopySubBufferMESA" );
 134     else
 135         glXCopySubBuffer = NULL;
 136     if( hasGLExtension( "GLX_SGI_video_sync" ))
 137         {
 138         glXGetVideoSync = (glXGetVideoSync_func) getProcAddress( "glXGetVideoSyncSGI" );
 139         glXWaitVideoSync = (glXWaitVideoSync_func) getProcAddress( "glXWaitVideoSyncSGI" );
 140         }
 141     else
 142         {
 143         glXGetVideoSync = NULL;
 144         glXWaitVideoSync = NULL;
 145         }
 146
 147     GL_RESOLVE_WITH_EXT( glXGetFBConfigAttrib, glXGetFBConfigAttribSGIX );
 148     GL_RESOLVE_WITH_EXT( glXGetVisualFromFBConfig, glXGetVisualFromFBConfigSGIX );
 149     GL_RESOLVE( glXGetFBConfigs );
 150     GL_RESOLVE( glXCreateWindow );
 151     GL_RESOLVE( glXDestroyWindow );
 152     GL_RESOLVE( glXCreatePixmap );
 153     GL_RESOLVE( glXDestroyPixmap );
 154     }
 155
 156 void glResolveFunctions()
 157     {
 158     if( hasGLExtension( "GL_ARB_multitexture" ))
 159         {
 160         GL_RESOLVE_WITH_EXT( glActiveTexture, glActiveTextureARB );
 161         // Get number of texture units
 162         glGetIntegerv(GL_MAX_TEXTURE_UNITS, &glTextureUnitsCount);
 163         }
 164     else
 165         {
 166         glActiveTexture = NULL;
 167         glTextureUnitsCount = 0;
 168         }
 169     if( hasGLExtension( "GL_EXT_framebuffer_object" ))
 170         {
 171         glIsRenderbuffer = (glIsRenderbuffer_func) getProcAddress( "glIsRenderbufferEXT" );
 172         glBindRenderbuffer = (glBindRenderbuffer_func) getProcAddress( "glBindRenderbufferEXT" );
 173         glDeleteRenderbuffers = (glDeleteRenderbuffers_func) getProcAddress( "glDeleteRenderbuffersEXT" );
 174         glGenRenderbuffers = (glGenRenderbuffers_func) getProcAddress( "glGenRenderbuffersEXT" );
 175
 176         glRenderbufferStorage = (glRenderbufferStorage_func) getProcAddress( "glRenderbufferStorageEXT" );
 177
 178         glGetRenderbufferParameteriv = (glGetRenderbufferParameteriv_func) getProcAddress( "glGetRenderbufferParameterivEXT" );
 179
 180         glIsFramebuffer = (glIsFramebuffer_func) getProcAddress( "glIsFramebufferEXT" );
 181         glBindFramebuffer = (glBindFramebuffer_func) getProcAddress( "glBindFramebufferEXT" );
 182         glDeleteFramebuffers = (glDeleteFramebuffers_func) getProcAddress( "glDeleteFramebuffersEXT" );
 183         glGenFramebuffers = (glGenFramebuffers_func) getProcAddress( "glGenFramebuffersEXT" );
 184
 185         glCheckFramebufferStatus = (glCheckFramebufferStatus_func) getProcAddress( "glCheckFramebufferStatusEXT" );
 186
 187         glFramebufferTexture1D = (glFramebufferTexture1D_func) getProcAddress( "glFramebufferTexture1DEXT" );
 188         glFramebufferTexture2D = (glFramebufferTexture2D_func) getProcAddress( "glFramebufferTexture2DEXT" );
 189         glFramebufferTexture3D = (glFramebufferTexture3D_func) getProcAddress( "glFramebufferTexture3DEXT" );
 190
 191         glFramebufferRenderbuffer = (glFramebufferRenderbuffer_func) getProcAddress( "glFramebufferRenderbufferEXT" );
 192
 193         glGetFramebufferAttachmentParameteriv = (glGetFramebufferAttachmentParameteriv_func) getProcAddress( "glGetFramebufferAttachmentParameterivEXT" );
 194
 195         glGenerateMipmap = (glGenerateMipmap_func) getProcAddress( "glGenerateMipmapEXT" );
 196         }
 197     else
 198         {
 199         glIsRenderbuffer = NULL;
 200         glBindRenderbuffer = NULL;
 201         glDeleteRenderbuffers = NULL;
 202         glGenRenderbuffers = NULL;
 203         glRenderbufferStorage = NULL;
 204         glGetRenderbufferParameteriv = NULL;
 205         glIsFramebuffer = NULL;
 206         glBindFramebuffer = NULL;
 207         glDeleteFramebuffers = NULL;
 208         glGenFramebuffers = NULL;
 209         glCheckFramebufferStatus = NULL;
 210         glFramebufferTexture1D = NULL;
 211         glFramebufferTexture2D = NULL;
 212         glFramebufferTexture3D = NULL;
 213         glFramebufferRenderbuffer = NULL;
 214         glGetFramebufferAttachmentParameteriv = NULL;
 215         glGenerateMipmap = NULL;
 216         }
 217     if( hasGLExtension( "GL_ARB_shading_language_100" ) && hasGLExtension( "GL_ARB_fragment_shader" ))
 218         {
 219         GL_RESOLVE_WITH_EXT( glCreateShader, glCreateShaderObjectARB );
 220         GL_RESOLVE_WITH_EXT( glShaderSource, glShaderSourceARB );
 221         GL_RESOLVE_WITH_EXT( glCompileShader, glCompileShaderARB );
 222         GL_RESOLVE_WITH_EXT( glDeleteShader, glDeleteObjectARB );
 223         GL_RESOLVE_WITH_EXT( glCreateProgram, glCreateProgramObjectARB );
 224         GL_RESOLVE_WITH_EXT( glAttachShader, glAttachObjectARB );
 225         GL_RESOLVE_WITH_EXT( glLinkProgram, glLinkProgramARB );
 226         GL_RESOLVE_WITH_EXT( glUseProgram, glUseProgramObjectARB );
 227         GL_RESOLVE_WITH_EXT( glDeleteProgram, glDeleteObjectARB );
 228         GL_RESOLVE_WITH_EXT( glGetShaderInfoLog, glGetInfoLogARB );
 229         GL_RESOLVE_WITH_EXT( glGetProgramInfoLog, glGetInfoLogARB );
 230         GL_RESOLVE_WITH_EXT( glGetProgramiv, glGetObjectParameterivARB );
 231         GL_RESOLVE_WITH_EXT( glGetShaderiv, glGetObjectParameterivARB );
 232         GL_RESOLVE_WITH_EXT( glUniform1f, glUniform1fARB );
 233         GL_RESOLVE_WITH_EXT( glUniform1i, glUniform1iARB );
 234         GL_RESOLVE_WITH_EXT( glUniform1fv, glUniform1fvARB );
 235         GL_RESOLVE_WITH_EXT( glUniform2fv, glUniform2fvARB );
 236         GL_RESOLVE_WITH_EXT( glValidateProgram, glValidateProgramARB );
 237         GL_RESOLVE_WITH_EXT( glGetUniformLocation, glGetUniformLocationARB );
 238         GL_RESOLVE_WITH_EXT( glVertexAttrib1f, glVertexAttrib1fARB );
 239         GL_RESOLVE_WITH_EXT( glGetAttribLocation, glGetAttribLocationARB );
 240         }
 241     }
 242
 243 } // namespace
 244
 245 #endif