Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gl.c @ 862:f7a8b0ca2ae3
IRIX doesn't have a GL library versioning system
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 26 Feb 2004 20:49:45 +0000 |
| parents | b8d311d90021 |
| children | 86885b40a53b |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdlib.h> /* For getenv() prototype */ | |
| 29 #include <string.h> | |
| 30 | |
| 31 #include "SDL_events_c.h" | |
| 32 #include "SDL_error.h" | |
| 33 #include "SDL_x11video.h" | |
| 34 #include "SDL_x11dga_c.h" | |
| 35 #include "SDL_x11gl_c.h" | |
| 36 | |
|
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37 #if defined(sgi) |
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38 /* IRIX doesn't have a GL library versioning system */ |
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39 #define DEFAULT_OPENGL "libGL.so" |
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40 #else |
| 0 | 41 #define DEFAULT_OPENGL "libGL.so.1" |
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42 #endif |
| 0 | 43 |
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44 #ifndef GLX_ARB_multisample |
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45 #define GLX_ARB_multisample |
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46 #define GLX_SAMPLE_BUFFERS_ARB 100000 |
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47 #define GLX_SAMPLES_ARB 100001 |
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48 #endif |
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49 |
| 0 | 50 /* return the preferred visual to use for openGL graphics */ |
| 51 XVisualInfo *X11_GL_GetVisual(_THIS) | |
| 52 { | |
| 53 #ifdef HAVE_OPENGL | |
| 54 /* 64 seems nice. */ | |
| 55 int attribs[64]; | |
| 56 int i; | |
| 57 | |
| 58 /* load the gl driver from a default path */ | |
| 59 if ( ! this->gl_config.driver_loaded ) { | |
| 60 /* no driver has been loaded, use default (ourselves) */ | |
| 61 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) { | |
| 62 return NULL; | |
| 63 } | |
| 64 } | |
| 65 | |
| 66 /* See if we already have a window which we must use */ | |
| 67 if ( SDL_windowid ) { | |
| 68 XWindowAttributes a; | |
| 69 XVisualInfo vi_in; | |
| 70 int out_count; | |
| 71 | |
| 72 XGetWindowAttributes(SDL_Display, SDL_Window, &a); | |
| 73 vi_in.screen = SDL_Screen; | |
| 74 vi_in.visualid = XVisualIDFromVisual(a.visual); | |
| 75 glx_visualinfo = XGetVisualInfo(SDL_Display, | |
| 76 VisualScreenMask|VisualIDMask, &vi_in, &out_count); | |
| 77 return glx_visualinfo; | |
| 78 } | |
| 79 | |
| 80 /* Setup our GLX attributes according to the gl_config. */ | |
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81 i = 0; |
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82 attribs[i++] = GLX_RGBA; |
| 0 | 83 attribs[i++] = GLX_RED_SIZE; |
| 84 attribs[i++] = this->gl_config.red_size; | |
| 85 attribs[i++] = GLX_GREEN_SIZE; | |
| 86 attribs[i++] = this->gl_config.green_size; | |
| 87 attribs[i++] = GLX_BLUE_SIZE; | |
| 88 attribs[i++] = this->gl_config.blue_size; | |
| 89 | |
| 90 if( this->gl_config.alpha_size ) { | |
| 91 attribs[i++] = GLX_ALPHA_SIZE; | |
| 92 attribs[i++] = this->gl_config.alpha_size; | |
| 93 } | |
| 94 | |
| 95 if( this->gl_config.buffer_size ) { | |
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96 attribs[i++] = GLX_BUFFER_SIZE; |
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97 attribs[i++] = this->gl_config.buffer_size; |
| 0 | 98 } |
| 99 | |
| 100 if( this->gl_config.double_buffer ) { | |
| 101 attribs[i++] = GLX_DOUBLEBUFFER; | |
| 102 } | |
| 103 | |
| 104 attribs[i++] = GLX_DEPTH_SIZE; | |
| 105 attribs[i++] = this->gl_config.depth_size; | |
| 106 | |
| 107 if( this->gl_config.stencil_size ) { | |
| 108 attribs[i++] = GLX_STENCIL_SIZE; | |
| 109 attribs[i++] = this->gl_config.stencil_size; | |
| 110 } | |
| 111 | |
| 112 if( this->gl_config.accum_red_size ) { | |
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113 attribs[i++] = GLX_ACCUM_RED_SIZE; |
| 0 | 114 attribs[i++] = this->gl_config.accum_red_size; |
| 115 } | |
| 116 | |
| 117 if( this->gl_config.accum_green_size ) { | |
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118 attribs[i++] = GLX_ACCUM_GREEN_SIZE; |
| 0 | 119 attribs[i++] = this->gl_config.accum_green_size; |
| 120 } | |
| 121 | |
| 122 if( this->gl_config.accum_blue_size ) { | |
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123 attribs[i++] = GLX_ACCUM_BLUE_SIZE; |
| 0 | 124 attribs[i++] = this->gl_config.accum_blue_size; |
| 125 } | |
| 126 | |
| 127 if( this->gl_config.accum_alpha_size ) { | |
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128 attribs[i++] = GLX_ACCUM_ALPHA_SIZE; |
| 0 | 129 attribs[i++] = this->gl_config.accum_alpha_size; |
| 130 } | |
| 131 | |
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132 if( this->gl_config.stereo ) { |
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133 attribs[i++] = GLX_STEREO; |
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134 attribs[i++] = this->gl_config.stereo; |
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135 } |
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136 |
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137 if( this->gl_config.multisamplebuffers ) { |
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138 attribs[i++] = GLX_SAMPLE_BUFFERS_ARB; |
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139 attribs[i++] = this->gl_config.multisamplebuffers; |
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140 } |
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141 |
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142 if( this->gl_config.multisamplesamples ) { |
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143 attribs[i++] = GLX_SAMPLES_ARB; |
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144 attribs[i++] = this->gl_config.multisamplesamples; |
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145 } |
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146 |
| 0 | 147 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */ |
| 148 attribs[i++] = GLX_X_VISUAL_TYPE; | |
| 149 attribs[i++] = GLX_DIRECT_COLOR; | |
| 150 #endif | |
| 151 attribs[i++] = None; | |
| 152 | |
| 153 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 154 SDL_Screen, attribs); | |
| 155 #ifdef GLX_DIRECT_COLOR | |
| 156 if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */ | |
| 157 attribs[i-3] = None; | |
| 158 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 159 SDL_Screen, attribs); | |
| 160 } | |
| 161 #endif | |
| 162 if( !glx_visualinfo ) { | |
| 163 SDL_SetError( "Couldn't find matching GLX visual"); | |
| 164 return NULL; | |
| 165 } | |
| 166 return glx_visualinfo; | |
| 167 #else | |
| 168 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 169 return NULL; | |
| 170 #endif | |
| 171 } | |
| 172 | |
| 173 int X11_GL_CreateWindow(_THIS, int w, int h) | |
| 174 { | |
| 175 int retval; | |
| 176 #ifdef HAVE_OPENGL | |
| 177 XSetWindowAttributes attributes; | |
| 178 unsigned long mask; | |
| 179 unsigned long black; | |
| 180 | |
| 181 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display, | |
| 182 SDL_Screen)) | |
| 183 ? BlackPixel(SDL_Display, SDL_Screen) : 0; | |
| 184 attributes.background_pixel = black; | |
| 185 attributes.border_pixel = black; | |
| 186 attributes.colormap = SDL_XColorMap; | |
| 187 mask = CWBackPixel | CWBorderPixel | CWColormap; | |
| 188 | |
| 189 SDL_Window = XCreateWindow(SDL_Display, WMwindow, | |
| 190 0, 0, w, h, 0, glx_visualinfo->depth, | |
| 191 InputOutput, glx_visualinfo->visual, | |
| 192 mask, &attributes); | |
| 193 if ( !SDL_Window ) { | |
| 194 SDL_SetError("Could not create window"); | |
| 195 return -1; | |
| 196 } | |
| 197 retval = 0; | |
| 198 #else | |
| 199 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 200 retval = -1; | |
| 201 #endif | |
| 202 return(retval); | |
| 203 } | |
| 204 | |
| 205 int X11_GL_CreateContext(_THIS) | |
| 206 { | |
| 207 int retval; | |
| 208 #ifdef HAVE_OPENGL | |
| 209 /* We do this to create a clean separation between X and GLX errors. */ | |
| 210 XSync( SDL_Display, False ); | |
| 211 glx_context = this->gl_data->glXCreateContext(GFX_Display, | |
| 212 glx_visualinfo, NULL, True); | |
| 213 XSync( GFX_Display, False ); | |
| 214 | |
| 215 if (glx_context == NULL) { | |
| 216 SDL_SetError("Could not create GL context"); | |
| 217 return -1; | |
| 218 } | |
| 219 | |
| 220 gl_active = 1; | |
| 221 #else | |
| 222 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 223 #endif | |
| 224 if ( gl_active ) { | |
| 225 retval = 0; | |
| 226 } else { | |
| 227 retval = -1; | |
| 228 } | |
| 229 return(retval); | |
| 230 } | |
| 231 | |
| 232 void X11_GL_Shutdown(_THIS) | |
| 233 { | |
| 234 #ifdef HAVE_OPENGL | |
| 235 /* Clean up OpenGL */ | |
| 236 if( glx_context ) { | |
| 237 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL); | |
| 238 | |
| 239 if (glx_context != NULL) | |
| 240 this->gl_data->glXDestroyContext(GFX_Display, glx_context); | |
| 241 | |
| 242 if( this->gl_data->glXReleaseBuffersMESA ) { | |
| 243 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window); | |
| 244 } | |
| 245 glx_context = NULL; | |
| 246 } | |
| 247 gl_active = 0; | |
| 248 #endif /* HAVE_OPENGL */ | |
| 249 } | |
| 250 | |
| 251 #ifdef HAVE_OPENGL | |
| 252 | |
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253 static int ExtensionSupported(const char *extension) |
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254 { |
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255 const GLubyte *extensions = NULL; |
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256 const GLubyte *start; |
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257 GLubyte *where, *terminator; |
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258 |
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259 /* Extension names should not have spaces. */ |
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260 where = (GLubyte *) strchr(extension, ' '); |
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261 if (where || *extension == '\0') |
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262 return 0; |
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263 |
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264 extensions = current_video->glGetString(GL_EXTENSIONS); |
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265 /* It takes a bit of care to be fool-proof about parsing the |
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266 * OpenGL extensions string. Don't be fooled by sub-strings, |
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267 * etc. */ |
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268 |
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269 start = extensions; |
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270 |
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271 for (;;) |
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272 { |
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273 where = (GLubyte *) strstr((const char *) start, extension); |
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274 if (!where) break; |
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275 |
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276 terminator = where + strlen(extension); |
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277 if (where == start || *(where - 1) == ' ') |
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278 if (*terminator == ' ' || *terminator == '\0') return 1; |
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279 |
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280 start = terminator; |
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281 } |
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282 |
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283 return 0; |
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284 } |
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285 |
| 0 | 286 /* Make the current context active */ |
| 287 int X11_GL_MakeCurrent(_THIS) | |
| 288 { | |
| 289 int retval; | |
|
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290 |
| 0 | 291 retval = 0; |
| 292 if ( ! this->gl_data->glXMakeCurrent(GFX_Display, | |
| 293 SDL_Window, glx_context) ) { | |
| 294 SDL_SetError("Unable to make GL context current"); | |
| 295 retval = -1; | |
| 296 } | |
| 297 XSync( GFX_Display, False ); | |
| 298 | |
|
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299 /* |
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300 * The context is now current, check for glXReleaseBuffersMESA() |
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301 * extension. If extension is _not_ supported, destroy the pointer |
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302 * (to make sure it will not be called in X11_GL_Shutdown() ). |
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303 * |
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304 * DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so, |
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305 * but there's no need to call it (is is only needed for some old |
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306 * non-DRI drivers). |
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307 * |
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308 * When using for example glew (http://glew.sf.net), dlsym() for |
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309 * glXReleaseBuffersMESA() returns the pointer from the glew library |
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310 * (namespace conflict). |
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311 * |
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312 * The glXReleaseBuffersMESA() pointer in the glew is NULL, if the |
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313 * driver doesn't support this extension. So blindly calling it will |
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314 * cause segfault with DRI/Mesa drivers! |
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315 * |
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316 */ |
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317 |
|
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318 if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) { |
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319 this->gl_data->glXReleaseBuffersMESA = NULL; |
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320 } |
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321 |
| 0 | 322 /* More Voodoo X server workarounds... Grr... */ |
| 323 SDL_Lock_EventThread(); | |
| 324 X11_CheckDGAMouse(this); | |
| 325 SDL_Unlock_EventThread(); | |
| 326 | |
| 327 return(retval); | |
| 328 } | |
| 329 | |
| 330 /* Get attribute data from glX. */ | |
| 331 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
| 332 { | |
| 333 int retval; | |
| 334 int glx_attrib = None; | |
| 335 | |
| 336 switch( attrib ) { | |
| 337 case SDL_GL_RED_SIZE: | |
| 338 glx_attrib = GLX_RED_SIZE; | |
| 339 break; | |
| 340 case SDL_GL_GREEN_SIZE: | |
| 341 glx_attrib = GLX_GREEN_SIZE; | |
| 342 break; | |
| 343 case SDL_GL_BLUE_SIZE: | |
| 344 glx_attrib = GLX_BLUE_SIZE; | |
| 345 break; | |
| 346 case SDL_GL_ALPHA_SIZE: | |
| 347 glx_attrib = GLX_ALPHA_SIZE; | |
| 348 break; | |
| 349 case SDL_GL_DOUBLEBUFFER: | |
| 350 glx_attrib = GLX_DOUBLEBUFFER; | |
| 351 break; | |
| 352 case SDL_GL_BUFFER_SIZE: | |
| 353 glx_attrib = GLX_BUFFER_SIZE; | |
| 354 break; | |
| 355 case SDL_GL_DEPTH_SIZE: | |
| 356 glx_attrib = GLX_DEPTH_SIZE; | |
| 357 break; | |
| 358 case SDL_GL_STENCIL_SIZE: | |
| 359 glx_attrib = GLX_STENCIL_SIZE; | |
| 360 break; | |
| 361 case SDL_GL_ACCUM_RED_SIZE: | |
| 362 glx_attrib = GLX_ACCUM_RED_SIZE; | |
| 363 break; | |
| 364 case SDL_GL_ACCUM_GREEN_SIZE: | |
| 365 glx_attrib = GLX_ACCUM_GREEN_SIZE; | |
| 366 break; | |
| 367 case SDL_GL_ACCUM_BLUE_SIZE: | |
| 368 glx_attrib = GLX_ACCUM_BLUE_SIZE; | |
| 369 break; | |
| 370 case SDL_GL_ACCUM_ALPHA_SIZE: | |
| 371 glx_attrib = GLX_ACCUM_ALPHA_SIZE; | |
| 372 break; | |
|
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373 case SDL_GL_STEREO: |
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374 glx_attrib = GLX_STEREO; |
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375 break; |
|
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376 case SDL_GL_MULTISAMPLEBUFFERS: |
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377 glx_attrib = GLX_SAMPLE_BUFFERS_ARB; |
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378 break; |
|
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379 case SDL_GL_MULTISAMPLESAMPLES: |
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380 glx_attrib = GLX_SAMPLES_ARB; |
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381 break; |
| 0 | 382 default: |
| 383 return(-1); | |
| 384 } | |
| 385 | |
| 386 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value); | |
| 387 | |
| 388 return retval; | |
| 389 } | |
| 390 | |
| 391 void X11_GL_SwapBuffers(_THIS) | |
| 392 { | |
| 393 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window); | |
| 394 } | |
| 395 | |
| 396 #endif /* HAVE_OPENGL */ | |
| 397 | |
| 398 void X11_GL_UnloadLibrary(_THIS) | |
| 399 { | |
| 400 #ifdef HAVE_OPENGL | |
| 401 if ( this->gl_config.driver_loaded ) { | |
| 402 dlclose(this->gl_config.dll_handle); | |
| 403 | |
| 404 this->gl_data->glXGetProcAddress = NULL; | |
| 405 this->gl_data->glXChooseVisual = NULL; | |
| 406 this->gl_data->glXCreateContext = NULL; | |
| 407 this->gl_data->glXDestroyContext = NULL; | |
| 408 this->gl_data->glXMakeCurrent = NULL; | |
| 409 this->gl_data->glXSwapBuffers = NULL; | |
| 410 | |
| 411 this->gl_config.dll_handle = NULL; | |
| 412 this->gl_config.driver_loaded = 0; | |
| 413 } | |
| 414 #endif | |
| 415 } | |
| 416 | |
| 417 #ifdef HAVE_OPENGL | |
| 418 | |
| 419 /* Passing a NULL path means load pointers from the application */ | |
| 420 int X11_GL_LoadLibrary(_THIS, const char* path) | |
| 421 { | |
| 422 void* handle; | |
| 423 int dlopen_flags; | |
| 424 | |
| 425 if ( gl_active ) { | |
| 426 SDL_SetError("OpenGL context already created"); | |
| 427 return -1; | |
| 428 } | |
| 429 | |
| 430 #ifdef RTLD_GLOBAL | |
| 431 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL; | |
| 432 #else | |
| 433 dlopen_flags = RTLD_LAZY; | |
| 434 #endif | |
| 435 handle = dlopen(path, dlopen_flags); | |
| 436 /* Catch the case where the application isn't linked with GL */ | |
| 437 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) { | |
| 438 dlclose(handle); | |
| 439 path = getenv("SDL_VIDEO_GL_DRIVER"); | |
| 440 if ( path == NULL ) { | |
| 441 path = DEFAULT_OPENGL; | |
| 442 } | |
| 443 handle = dlopen(path, dlopen_flags); | |
| 444 } | |
| 445 if ( handle == NULL ) { | |
| 446 SDL_SetError("Could not load OpenGL library"); | |
| 447 return -1; | |
| 448 } | |
| 449 | |
| 450 /* Unload the old driver and reset the pointers */ | |
| 451 X11_GL_UnloadLibrary(this); | |
| 452 | |
| 453 /* Load new function pointers */ | |
|
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454 this->gl_data->glXGetProcAddress = |
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455 (void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB"); |
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456 this->gl_data->glXChooseVisual = |
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457 (XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual"); |
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458 this->gl_data->glXCreateContext = |
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459 (GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext"); |
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460 this->gl_data->glXDestroyContext = |
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461 (void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext"); |
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462 this->gl_data->glXMakeCurrent = |
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463 (int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent"); |
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464 this->gl_data->glXSwapBuffers = |
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465 (void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers"); |
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466 this->gl_data->glXGetConfig = |
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467 (int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig"); |
|
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468 this->gl_data->glXQueryExtensionsString = |
|
646
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Fixed incorrect prototype for glXQueryExtensionsString()
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469 (const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString"); |
|
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470 |
| 0 | 471 /* We don't compare below for this in case we're not using Mesa. */ |
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472 this->gl_data->glXReleaseBuffersMESA = |
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473 (void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" ); |
|
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474 |
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475 |
| 0 | 476 if ( (this->gl_data->glXChooseVisual == NULL) || |
| 477 (this->gl_data->glXCreateContext == NULL) || | |
| 478 (this->gl_data->glXDestroyContext == NULL) || | |
| 479 (this->gl_data->glXMakeCurrent == NULL) || | |
| 480 (this->gl_data->glXSwapBuffers == NULL) || | |
|
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481 (this->gl_data->glXGetConfig == NULL) || |
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482 (this->gl_data->glXQueryExtensionsString == NULL)) { |
| 0 | 483 SDL_SetError("Could not retrieve OpenGL functions"); |
| 484 return -1; | |
| 485 } | |
| 486 | |
| 487 this->gl_config.dll_handle = handle; | |
| 488 this->gl_config.driver_loaded = 1; | |
| 489 if ( path ) { | |
| 490 strncpy(this->gl_config.driver_path, path, | |
| 491 sizeof(this->gl_config.driver_path)-1); | |
| 492 } else { | |
| 493 strcpy(this->gl_config.driver_path, ""); | |
| 494 } | |
| 495 return 0; | |
| 496 } | |
| 497 | |
| 498 void *X11_GL_GetProcAddress(_THIS, const char* proc) | |
| 499 { | |
|
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500 static char procname[1024]; |
| 0 | 501 void* handle; |
|
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502 void* retval; |
| 0 | 503 |
| 504 handle = this->gl_config.dll_handle; | |
| 505 if ( this->gl_data->glXGetProcAddress ) { | |
|
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506 return this->gl_data->glXGetProcAddress(proc); |
| 0 | 507 } |
|
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508 #if defined(__OpenBSD__) && !defined(__ELF__) |
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509 #undef dlsym(x,y); |
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510 #endif |
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511 retval = dlsym(handle, proc); |
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512 if (!retval && strlen(proc) <= 1022) { |
|
127
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513 procname[0] = '_'; |
|
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514 strcpy(procname + 1, proc); |
|
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515 retval = dlsym(handle, procname); |
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516 } |
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517 return retval; |
| 0 | 518 } |
| 519 | |
| 520 #endif /* HAVE_OPENGL */ |