src/video/x11/SDL_x11gl.c
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FUNCTIONS
This source file includes following functions.
- X11_GL_GetVisual
- X11_GL_CreateWindow
- X11_GL_CreateContext
- X11_GL_Shutdown
- X11_GL_MakeCurrent
- X11_GL_GetAttribute
- X11_GL_SwapBuffers
- X11_GL_UnloadLibrary
- X11_GL_LoadLibrary
- X11_GL_GetProcAddress
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_x11gl.c,v 1.1.2.28 2001/02/10 07:20:15 hercules Exp $";
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
37 #define DEFAULT_OPENGL "libGL.so.1"
38
39 /* return the preferred visual to use for openGL graphics */
40 XVisualInfo *X11_GL_GetVisual(_THIS)
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41 {
42 #ifdef HAVE_OPENGL
43 /* 64 seems nice. */
44 int attribs[64];
45 int i;
46
47 /* load the gl driver from a default path */
48 if ( ! this->gl_config.driver_loaded ) {
49 /* no driver has been loaded, use default (ourselves) */
50 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
51 return NULL;
52 }
53 }
54
55 /* See if we already have a window which we must use */
56 if ( SDL_windowid ) {
57 XWindowAttributes a;
58 XVisualInfo vi_in;
59 int out_count;
60
61 XGetWindowAttributes(SDL_Display, SDL_Window, &a);
62 vi_in.screen = SDL_Screen;
63 vi_in.visualid = XVisualIDFromVisual(a.visual);
64 glx_visualinfo = XGetVisualInfo(SDL_Display,
65 VisualScreenMask|VisualIDMask, &vi_in, &out_count);
66 return glx_visualinfo;
67 }
68
69 /* Setup our GLX attributes according to the gl_config. */
70 i = 0;
71 attribs[i++] = GLX_RGBA;
72 attribs[i++] = GLX_RED_SIZE;
73 attribs[i++] = this->gl_config.red_size;
74 attribs[i++] = GLX_GREEN_SIZE;
75 attribs[i++] = this->gl_config.green_size;
76 attribs[i++] = GLX_BLUE_SIZE;
77 attribs[i++] = this->gl_config.blue_size;
78
79 if( this->gl_config.alpha_size ) {
80 attribs[i++] = GLX_ALPHA_SIZE;
81 attribs[i++] = this->gl_config.alpha_size;
82 }
83
84 if( this->gl_config.buffer_size ) {
85 attribs[i++] = GLX_BUFFER_SIZE;
86 attribs[i++] = this->gl_config.buffer_size;
87 }
88
89 if( this->gl_config.double_buffer ) {
90 attribs[i++] = GLX_DOUBLEBUFFER;
91 }
92
93 attribs[i++] = GLX_DEPTH_SIZE;
94 attribs[i++] = this->gl_config.depth_size;
95
96 if( this->gl_config.stencil_size ) {
97 attribs[i++] = GLX_STENCIL_SIZE;
98 attribs[i++] = this->gl_config.stencil_size;
99 }
100
101 if( this->gl_config.accum_red_size ) {
102 attribs[i++] = GLX_ACCUM_RED_SIZE;
103 attribs[i++] = this->gl_config.accum_red_size;
104 }
105
106 if( this->gl_config.accum_green_size ) {
107 attribs[i++] = GLX_ACCUM_GREEN_SIZE;
108 attribs[i++] = this->gl_config.accum_green_size;
109 }
110
111 if( this->gl_config.accum_blue_size ) {
112 attribs[i++] = GLX_ACCUM_BLUE_SIZE;
113 attribs[i++] = this->gl_config.accum_blue_size;
114 }
115
116 if( this->gl_config.accum_alpha_size ) {
117 attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
118 attribs[i++] = this->gl_config.accum_alpha_size;
119 }
120
121 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
122 attribs[i++] = GLX_X_VISUAL_TYPE;
123 attribs[i++] = GLX_DIRECT_COLOR;
124 #endif
125 attribs[i++] = None;
126
127 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
128 SDL_Screen, attribs);
129 #ifdef GLX_DIRECT_COLOR
130 if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */
131 attribs[i-3] = None;
132 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
133 SDL_Screen, attribs);
134 }
135 #endif
136 if( !glx_visualinfo ) {
137 SDL_SetError( "Couldn't find matching GLX visual");
138 return NULL;
139 }
140 return glx_visualinfo;
141 #else
142 SDL_SetError("X11 driver not configured with OpenGL");
143 return NULL;
144 #endif
145 }
146
147 int X11_GL_CreateWindow(_THIS, int w, int h)
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148 {
149 int retval;
150 #ifdef HAVE_OPENGL
151 XSetWindowAttributes attributes;
152 unsigned long mask;
153 unsigned long black;
154
155 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
156 SDL_Screen))
157 ? BlackPixel(SDL_Display, SDL_Screen) : 0;
158 attributes.background_pixel = black;
159 attributes.border_pixel = black;
160 attributes.colormap = SDL_XColorMap;
161 mask = CWBackPixel | CWBorderPixel | CWColormap;
162
163 SDL_Window = XCreateWindow(SDL_Display, WMwindow,
164 0, 0, w, h, 0, glx_visualinfo->depth,
165 InputOutput, glx_visualinfo->visual,
166 mask, &attributes);
167 if ( !SDL_Window ) {
168 SDL_SetError("Could not create window");
169 return -1;
170 }
171 retval = 0;
172 #else
173 SDL_SetError("X11 driver not configured with OpenGL");
174 retval = -1;
175 #endif
176 return(retval);
177 }
178
179 int X11_GL_CreateContext(_THIS)
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180 {
181 int retval;
182 #ifdef HAVE_OPENGL
183 /* We do this to create a clean separation between X and GLX errors. */
184 XSync( SDL_Display, False );
185 glx_context = this->gl_data->glXCreateContext(GFX_Display,
186 glx_visualinfo, NULL, True);
187 XSync( GFX_Display, False );
188
189 if (glx_context == NULL) {
190 SDL_SetError("Could not create GL context");
191 return -1;
192 }
193
194 gl_active = 1;
195 #else
196 SDL_SetError("X11 driver not configured with OpenGL");
197 #endif
198 if ( gl_active ) {
199 retval = 0;
200 } else {
201 retval = -1;
202 }
203 return(retval);
204 }
205
206 void X11_GL_Shutdown(_THIS)
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207 {
208 #ifdef HAVE_OPENGL
209 /* Clean up OpenGL */
210 if( glx_context ) {
211 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
212
213 if (glx_context != NULL)
214 this->gl_data->glXDestroyContext(GFX_Display, glx_context);
215
216 if( this->gl_data->glXReleaseBuffersMESA ) {
217 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
218 }
219 glx_context = NULL;
220 }
221 gl_active = 0;
222 #endif /* HAVE_OPENGL */
223 }
224
225 #ifdef HAVE_OPENGL
226
227 /* Make the current context active */
228 int X11_GL_MakeCurrent(_THIS)
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229 {
230 int retval;
231
232 retval = 0;
233 if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
234 SDL_Window, glx_context) ) {
235 SDL_SetError("Unable to make GL context current");
236 retval = -1;
237 }
238 XSync( GFX_Display, False );
239
240 /* More Voodoo X server workarounds... Grr... */
241 SDL_Lock_EventThread();
242 X11_CheckDGAMouse(this);
243 SDL_Unlock_EventThread();
244
245 return(retval);
246 }
247
248 /* Get attribute data from glX. */
249 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
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250 {
251 int retval;
252 int glx_attrib = None;
253
254 switch( attrib ) {
255 case SDL_GL_RED_SIZE:
256 glx_attrib = GLX_RED_SIZE;
257 break;
258 case SDL_GL_GREEN_SIZE:
259 glx_attrib = GLX_GREEN_SIZE;
260 break;
261 case SDL_GL_BLUE_SIZE:
262 glx_attrib = GLX_BLUE_SIZE;
263 break;
264 case SDL_GL_ALPHA_SIZE:
265 glx_attrib = GLX_ALPHA_SIZE;
266 break;
267 case SDL_GL_DOUBLEBUFFER:
268 glx_attrib = GLX_DOUBLEBUFFER;
269 break;
270 case SDL_GL_BUFFER_SIZE:
271 glx_attrib = GLX_BUFFER_SIZE;
272 break;
273 case SDL_GL_DEPTH_SIZE:
274 glx_attrib = GLX_DEPTH_SIZE;
275 break;
276 case SDL_GL_STENCIL_SIZE:
277 glx_attrib = GLX_STENCIL_SIZE;
278 break;
279 case SDL_GL_ACCUM_RED_SIZE:
280 glx_attrib = GLX_ACCUM_RED_SIZE;
281 break;
282 case SDL_GL_ACCUM_GREEN_SIZE:
283 glx_attrib = GLX_ACCUM_GREEN_SIZE;
284 break;
285 case SDL_GL_ACCUM_BLUE_SIZE:
286 glx_attrib = GLX_ACCUM_BLUE_SIZE;
287 break;
288 case SDL_GL_ACCUM_ALPHA_SIZE:
289 glx_attrib = GLX_ACCUM_ALPHA_SIZE;
290 break;
291 default:
292 return(-1);
293 }
294
295 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
296
297 return retval;
298 }
299
300 void X11_GL_SwapBuffers(_THIS)
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301 {
302 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
303 }
304
305 #endif /* HAVE_OPENGL */
306
307 void X11_GL_UnloadLibrary(_THIS)
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308 {
309 #ifdef HAVE_OPENGL
310 if ( this->gl_config.driver_loaded ) {
311 dlclose(this->gl_config.dll_handle);
312
313 this->gl_data->glXGetProcAddress = NULL;
314 this->gl_data->glXChooseVisual = NULL;
315 this->gl_data->glXCreateContext = NULL;
316 this->gl_data->glXDestroyContext = NULL;
317 this->gl_data->glXMakeCurrent = NULL;
318 this->gl_data->glXSwapBuffers = NULL;
319
320 this->gl_config.dll_handle = NULL;
321 this->gl_config.driver_loaded = 0;
322 }
323 #endif
324 }
325
326 #ifdef HAVE_OPENGL
327
328 /* Passing a NULL path means load pointers from the application */
329 int X11_GL_LoadLibrary(_THIS, const char* path)
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330 {
331 void* handle;
332 int dlopen_flags;
333
334 if ( gl_active ) {
335 SDL_SetError("OpenGL context already created");
336 return -1;
337 }
338
339 #ifdef RTLD_GLOBAL
340 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
341 #else
342 dlopen_flags = RTLD_LAZY;
343 #endif
344 handle = dlopen(path, dlopen_flags);
345 /* Catch the case where the application isn't linked with GL */
346 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
347 dlclose(handle);
348 path = getenv("SDL_VIDEO_GL_DRIVER");
349 if ( path == NULL ) {
350 path = DEFAULT_OPENGL;
351 }
352 handle = dlopen(path, dlopen_flags);
353 }
354 if ( handle == NULL ) {
355 SDL_SetError("Could not load OpenGL library");
356 return -1;
357 }
358
359 /* Unload the old driver and reset the pointers */
360 X11_GL_UnloadLibrary(this);
361
362 /* Load new function pointers */
363 this->gl_data->glXGetProcAddress = dlsym(handle, "glXGetProcAddressARB");
364 this->gl_data->glXChooseVisual = dlsym(handle, "glXChooseVisual");
365 this->gl_data->glXCreateContext = dlsym(handle, "glXCreateContext");
366 this->gl_data->glXDestroyContext = dlsym(handle, "glXDestroyContext");
367 this->gl_data->glXMakeCurrent = dlsym(handle, "glXMakeCurrent");
368 this->gl_data->glXSwapBuffers = dlsym(handle, "glXSwapBuffers");
369 this->gl_data->glXGetConfig = dlsym(handle, "glXGetConfig");
370 /* We don't compare below for this in case we're not using Mesa. */
371 this->gl_data->glXReleaseBuffersMESA = dlsym( handle, "glXReleaseBuffersMESA" );
372
373 if ( (this->gl_data->glXChooseVisual == NULL) ||
374 (this->gl_data->glXCreateContext == NULL) ||
375 (this->gl_data->glXDestroyContext == NULL) ||
376 (this->gl_data->glXMakeCurrent == NULL) ||
377 (this->gl_data->glXSwapBuffers == NULL) ||
378 (this->gl_data->glXGetConfig == NULL) ) {
379 SDL_SetError("Could not retrieve OpenGL functions");
380 return -1;
381 }
382
383 this->gl_config.dll_handle = handle;
384 this->gl_config.driver_loaded = 1;
385 if ( path ) {
386 strncpy(this->gl_config.driver_path, path,
387 sizeof(this->gl_config.driver_path)-1);
388 } else {
389 strcpy(this->gl_config.driver_path, "");
390 }
391 return 0;
392 }
393
394 void *X11_GL_GetProcAddress(_THIS, const char* proc)
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395 {
396 void* handle;
397
398 handle = this->gl_config.dll_handle;
399 #if 0 /* This doesn't work correctly yet */
400 if ( this->gl_data->glXGetProcAddress ) {
401 void *func, *func2;
402 func = this->gl_data->glXGetProcAddress(proc);
403 func2 = dlsym(handle, proc);
404 if ( func != func2 ) {
405 fprintf(stderr, "glXGetProcAddress returned %p and dlsym returned %p for %s\n", func, func2, proc);
406 }
407 return this->gl_data->glXGetProcAddress(proc);
408 }
409 #endif
410 return dlsym(handle, proc);
411 }
412
413 #endif /* HAVE_OPENGL */