annotate src/video/x11/SDL_x11gl.c @ 78:e9582f471c02

Added the environment variable SDL_MOUSE_NORELATIVE to completely disable relative mouse motion if the application desires it. UNDOCUMENTED!!
author Sam Lantinga <slouken@lokigames.com>
date Sat, 23 Jun 2001 18:51:29 +0000
parents a8360daed17d
children 7edee9f0f2cc
rev   line source
0
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <stdlib.h> /* For getenv() prototype */
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29 #include <string.h>
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30
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31 #include "SDL_events_c.h"
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32 #include "SDL_error.h"
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33 #include "SDL_x11video.h"
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34 #include "SDL_x11dga_c.h"
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35 #include "SDL_x11gl_c.h"
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36
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37 #define DEFAULT_OPENGL "libGL.so.1"
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38
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39 /* return the preferred visual to use for openGL graphics */
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40 XVisualInfo *X11_GL_GetVisual(_THIS)
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41 {
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42 #ifdef HAVE_OPENGL
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43 /* 64 seems nice. */
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44 int attribs[64];
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45 int i;
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46
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47 /* load the gl driver from a default path */
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48 if ( ! this->gl_config.driver_loaded ) {
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49 /* no driver has been loaded, use default (ourselves) */
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50 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
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51 return NULL;
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52 }
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53 }
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54
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55 /* See if we already have a window which we must use */
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56 if ( SDL_windowid ) {
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57 XWindowAttributes a;
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58 XVisualInfo vi_in;
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59 int out_count;
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60
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61 XGetWindowAttributes(SDL_Display, SDL_Window, &a);
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62 vi_in.screen = SDL_Screen;
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63 vi_in.visualid = XVisualIDFromVisual(a.visual);
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64 glx_visualinfo = XGetVisualInfo(SDL_Display,
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65 VisualScreenMask|VisualIDMask, &vi_in, &out_count);
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66 return glx_visualinfo;
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67 }
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68
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69 /* Setup our GLX attributes according to the gl_config. */
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70 i = 0;
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71 attribs[i++] = GLX_RGBA;
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72 attribs[i++] = GLX_RED_SIZE;
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73 attribs[i++] = this->gl_config.red_size;
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74 attribs[i++] = GLX_GREEN_SIZE;
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75 attribs[i++] = this->gl_config.green_size;
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76 attribs[i++] = GLX_BLUE_SIZE;
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77 attribs[i++] = this->gl_config.blue_size;
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78
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79 if( this->gl_config.alpha_size ) {
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80 attribs[i++] = GLX_ALPHA_SIZE;
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81 attribs[i++] = this->gl_config.alpha_size;
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82 }
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83
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84 if( this->gl_config.buffer_size ) {
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85 attribs[i++] = GLX_BUFFER_SIZE;
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86 attribs[i++] = this->gl_config.buffer_size;
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87 }
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88
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89 if( this->gl_config.double_buffer ) {
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90 attribs[i++] = GLX_DOUBLEBUFFER;
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91 }
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92
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93 attribs[i++] = GLX_DEPTH_SIZE;
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94 attribs[i++] = this->gl_config.depth_size;
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95
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96 if( this->gl_config.stencil_size ) {
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97 attribs[i++] = GLX_STENCIL_SIZE;
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98 attribs[i++] = this->gl_config.stencil_size;
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99 }
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100
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101 if( this->gl_config.accum_red_size ) {
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102 attribs[i++] = GLX_ACCUM_RED_SIZE;
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103 attribs[i++] = this->gl_config.accum_red_size;
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104 }
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105
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106 if( this->gl_config.accum_green_size ) {
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107 attribs[i++] = GLX_ACCUM_GREEN_SIZE;
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108 attribs[i++] = this->gl_config.accum_green_size;
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109 }
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110
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111 if( this->gl_config.accum_blue_size ) {
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112 attribs[i++] = GLX_ACCUM_BLUE_SIZE;
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113 attribs[i++] = this->gl_config.accum_blue_size;
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114 }
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115
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116 if( this->gl_config.accum_alpha_size ) {
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117 attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
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118 attribs[i++] = this->gl_config.accum_alpha_size;
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119 }
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120
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121 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
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122 attribs[i++] = GLX_X_VISUAL_TYPE;
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123 attribs[i++] = GLX_DIRECT_COLOR;
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124 #endif
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125 attribs[i++] = None;
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126
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127 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
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128 SDL_Screen, attribs);
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129 #ifdef GLX_DIRECT_COLOR
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130 if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */
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131 attribs[i-3] = None;
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132 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
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133 SDL_Screen, attribs);
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134 }
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135 #endif
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136 if( !glx_visualinfo ) {
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137 SDL_SetError( "Couldn't find matching GLX visual");
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138 return NULL;
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139 }
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140 return glx_visualinfo;
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141 #else
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142 SDL_SetError("X11 driver not configured with OpenGL");
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143 return NULL;
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144 #endif
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145 }
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146
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147 int X11_GL_CreateWindow(_THIS, int w, int h)
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148 {
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149 int retval;
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150 #ifdef HAVE_OPENGL
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151 XSetWindowAttributes attributes;
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152 unsigned long mask;
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153 unsigned long black;
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154
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155 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
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156 SDL_Screen))
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157 ? BlackPixel(SDL_Display, SDL_Screen) : 0;
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158 attributes.background_pixel = black;
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159 attributes.border_pixel = black;
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160 attributes.colormap = SDL_XColorMap;
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161 mask = CWBackPixel | CWBorderPixel | CWColormap;
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162
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163 SDL_Window = XCreateWindow(SDL_Display, WMwindow,
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164 0, 0, w, h, 0, glx_visualinfo->depth,
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165 InputOutput, glx_visualinfo->visual,
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166 mask, &attributes);
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parents:
diff changeset
167 if ( !SDL_Window ) {
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168 SDL_SetError("Could not create window");
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parents:
diff changeset
169 return -1;
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parents:
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170 }
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171 retval = 0;
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172 #else
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173 SDL_SetError("X11 driver not configured with OpenGL");
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174 retval = -1;
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parents:
diff changeset
175 #endif
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parents:
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176 return(retval);
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parents:
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177 }
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178
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179 int X11_GL_CreateContext(_THIS)
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180 {
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181 int retval;
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parents:
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182 #ifdef HAVE_OPENGL
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183 /* We do this to create a clean separation between X and GLX errors. */
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184 XSync( SDL_Display, False );
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185 glx_context = this->gl_data->glXCreateContext(GFX_Display,
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diff changeset
186 glx_visualinfo, NULL, True);
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187 XSync( GFX_Display, False );
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diff changeset
188
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diff changeset
189 if (glx_context == NULL) {
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190 SDL_SetError("Could not create GL context");
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diff changeset
191 return -1;
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192 }
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diff changeset
193
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194 gl_active = 1;
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195 #else
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196 SDL_SetError("X11 driver not configured with OpenGL");
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197 #endif
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198 if ( gl_active ) {
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199 retval = 0;
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diff changeset
200 } else {
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diff changeset
201 retval = -1;
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parents:
diff changeset
202 }
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parents:
diff changeset
203 return(retval);
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parents:
diff changeset
204 }
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parents:
diff changeset
205
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diff changeset
206 void X11_GL_Shutdown(_THIS)
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diff changeset
207 {
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parents:
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208 #ifdef HAVE_OPENGL
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parents:
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209 /* Clean up OpenGL */
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parents:
diff changeset
210 if( glx_context ) {
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211 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
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parents:
diff changeset
212
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diff changeset
213 if (glx_context != NULL)
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diff changeset
214 this->gl_data->glXDestroyContext(GFX_Display, glx_context);
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diff changeset
215
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parents:
diff changeset
216 if( this->gl_data->glXReleaseBuffersMESA ) {
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diff changeset
217 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
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parents:
diff changeset
218 }
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diff changeset
219 glx_context = NULL;
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parents:
diff changeset
220 }
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parents:
diff changeset
221 gl_active = 0;
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parents:
diff changeset
222 #endif /* HAVE_OPENGL */
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parents:
diff changeset
223 }
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parents:
diff changeset
224
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parents:
diff changeset
225 #ifdef HAVE_OPENGL
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parents:
diff changeset
226
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parents:
diff changeset
227 /* Make the current context active */
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parents:
diff changeset
228 int X11_GL_MakeCurrent(_THIS)
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parents:
diff changeset
229 {
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parents:
diff changeset
230 int retval;
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parents:
diff changeset
231
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diff changeset
232 retval = 0;
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parents:
diff changeset
233 if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
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parents:
diff changeset
234 SDL_Window, glx_context) ) {
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parents:
diff changeset
235 SDL_SetError("Unable to make GL context current");
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parents:
diff changeset
236 retval = -1;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
237 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
238 XSync( GFX_Display, False );
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
239
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
240 /* More Voodoo X server workarounds... Grr... */
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
241 SDL_Lock_EventThread();
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
242 X11_CheckDGAMouse(this);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
243 SDL_Unlock_EventThread();
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
244
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
245 return(retval);
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
246 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
247
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parents:
diff changeset
248 /* Get attribute data from glX. */
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parents:
diff changeset
249 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
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parents:
diff changeset
250 {
74212992fb08 Initial revision
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parents:
diff changeset
251 int retval;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
252 int glx_attrib = None;
74212992fb08 Initial revision
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parents:
diff changeset
253
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parents:
diff changeset
254 switch( attrib ) {
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
255 case SDL_GL_RED_SIZE:
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parents:
diff changeset
256 glx_attrib = GLX_RED_SIZE;
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
257 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
258 case SDL_GL_GREEN_SIZE:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
259 glx_attrib = GLX_GREEN_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
260 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
261 case SDL_GL_BLUE_SIZE:
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Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
262 glx_attrib = GLX_BLUE_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
263 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
264 case SDL_GL_ALPHA_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
265 glx_attrib = GLX_ALPHA_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
266 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
267 case SDL_GL_DOUBLEBUFFER:
74212992fb08 Initial revision
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parents:
diff changeset
268 glx_attrib = GLX_DOUBLEBUFFER;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
269 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
270 case SDL_GL_BUFFER_SIZE:
74212992fb08 Initial revision
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parents:
diff changeset
271 glx_attrib = GLX_BUFFER_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
272 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
273 case SDL_GL_DEPTH_SIZE:
74212992fb08 Initial revision
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parents:
diff changeset
274 glx_attrib = GLX_DEPTH_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
275 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
276 case SDL_GL_STENCIL_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
277 glx_attrib = GLX_STENCIL_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
278 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
279 case SDL_GL_ACCUM_RED_SIZE:
74212992fb08 Initial revision
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parents:
diff changeset
280 glx_attrib = GLX_ACCUM_RED_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
281 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
282 case SDL_GL_ACCUM_GREEN_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
283 glx_attrib = GLX_ACCUM_GREEN_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
284 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
285 case SDL_GL_ACCUM_BLUE_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
286 glx_attrib = GLX_ACCUM_BLUE_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
287 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
288 case SDL_GL_ACCUM_ALPHA_SIZE:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
289 glx_attrib = GLX_ACCUM_ALPHA_SIZE;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
290 break;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
291 default:
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
292 return(-1);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
293 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
294
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
295 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
296
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
297 return retval;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
298 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
299
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
300 void X11_GL_SwapBuffers(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
301 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
302 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
303 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
304
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
305 #endif /* HAVE_OPENGL */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
306
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
307 void X11_GL_UnloadLibrary(_THIS)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
308 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
309 #ifdef HAVE_OPENGL
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
310 if ( this->gl_config.driver_loaded ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
311 dlclose(this->gl_config.dll_handle);
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
312
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
313 this->gl_data->glXGetProcAddress = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
314 this->gl_data->glXChooseVisual = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
315 this->gl_data->glXCreateContext = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
316 this->gl_data->glXDestroyContext = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
317 this->gl_data->glXMakeCurrent = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
318 this->gl_data->glXSwapBuffers = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
319
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
320 this->gl_config.dll_handle = NULL;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
321 this->gl_config.driver_loaded = 0;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
322 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
323 #endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
324 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
325
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
326 #ifdef HAVE_OPENGL
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
327
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
328 /* Passing a NULL path means load pointers from the application */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
329 int X11_GL_LoadLibrary(_THIS, const char* path)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
330 {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
331 void* handle;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
332 int dlopen_flags;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
333
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
334 if ( gl_active ) {
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
335 SDL_SetError("OpenGL context already created");
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
336 return -1;
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
337 }
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
338
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
339 #ifdef RTLD_GLOBAL
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340 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
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341 #else
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342 dlopen_flags = RTLD_LAZY;
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343 #endif
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344 handle = dlopen(path, dlopen_flags);
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345 /* Catch the case where the application isn't linked with GL */
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346 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
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347 dlclose(handle);
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348 path = getenv("SDL_VIDEO_GL_DRIVER");
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349 if ( path == NULL ) {
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350 path = DEFAULT_OPENGL;
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351 }
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352 handle = dlopen(path, dlopen_flags);
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353 }
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354 if ( handle == NULL ) {
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355 SDL_SetError("Could not load OpenGL library");
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356 return -1;
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357 }
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358
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359 /* Unload the old driver and reset the pointers */
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360 X11_GL_UnloadLibrary(this);
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361
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362 /* Load new function pointers */
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363 this->gl_data->glXGetProcAddress = dlsym(handle, "glXGetProcAddressARB");
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364 this->gl_data->glXChooseVisual = dlsym(handle, "glXChooseVisual");
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365 this->gl_data->glXCreateContext = dlsym(handle, "glXCreateContext");
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366 this->gl_data->glXDestroyContext = dlsym(handle, "glXDestroyContext");
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367 this->gl_data->glXMakeCurrent = dlsym(handle, "glXMakeCurrent");
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368 this->gl_data->glXSwapBuffers = dlsym(handle, "glXSwapBuffers");
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369 this->gl_data->glXGetConfig = dlsym(handle, "glXGetConfig");
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370 /* We don't compare below for this in case we're not using Mesa. */
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371 this->gl_data->glXReleaseBuffersMESA = dlsym( handle, "glXReleaseBuffersMESA" );
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372
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373 if ( (this->gl_data->glXChooseVisual == NULL) ||
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374 (this->gl_data->glXCreateContext == NULL) ||
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375 (this->gl_data->glXDestroyContext == NULL) ||
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376 (this->gl_data->glXMakeCurrent == NULL) ||
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377 (this->gl_data->glXSwapBuffers == NULL) ||
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378 (this->gl_data->glXGetConfig == NULL) ) {
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379 SDL_SetError("Could not retrieve OpenGL functions");
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380 return -1;
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381 }
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382
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383 this->gl_config.dll_handle = handle;
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384 this->gl_config.driver_loaded = 1;
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385 if ( path ) {
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386 strncpy(this->gl_config.driver_path, path,
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387 sizeof(this->gl_config.driver_path)-1);
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388 } else {
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389 strcpy(this->gl_config.driver_path, "");
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390 }
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391 return 0;
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392 }
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393
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394 void *X11_GL_GetProcAddress(_THIS, const char* proc)
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395 {
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396 void* handle;
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397
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398 handle = this->gl_config.dll_handle;
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399 #if 0 /* This doesn't work correctly yet */
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400 if ( this->gl_data->glXGetProcAddress ) {
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401 void *func, *func2;
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402 func = this->gl_data->glXGetProcAddress(proc);
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403 func2 = dlsym(handle, proc);
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404 if ( func != func2 ) {
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405 fprintf(stderr, "glXGetProcAddress returned %p and dlsym returned %p for %s\n", func, func2, proc);
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406 }
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407 return this->gl_data->glXGetProcAddress(proc);
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408 }
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409 #endif
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410 return dlsym(handle, proc);
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411 }
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412
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413 #endif /* HAVE_OPENGL */