SDL_x11gl.c
1
2
/*
SDL - Simple DirectMedia Layer
3
Copyright (C) 1997-2009 Sam Lantinga
4
5
This library is free software; you can redistribute it and/or
6
modify it under the terms of the GNU Lesser General Public
7
License as published by the Free Software Foundation; either
8
version 2.1 of the License, or (at your option) any later version.
9
10
11
12
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13
Lesser General Public License for more details.
15
16
17
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18
19
Sam Lantinga
20
slouken@libsdl.org
21
*/
22
#include "SDL_config.h"
23
24
#include "SDL_x11video.h"
25
#include "../../events/SDL_events_c.h"
26
27
28
#include "SDL_x11dga_c.h"
#include "SDL_x11gl_c.h"
29
#if defined(__IRIX__)
30
31
/* IRIX doesn't have a GL library versioning system */
#define DEFAULT_OPENGL "libGL.so"
32
#elif defined(__MACOSX__)
33
#define DEFAULT_OPENGL "/usr/X11R6/lib/libGL.1.dylib"
34
35
#elif defined(__QNXNTO__)
#define DEFAULT_OPENGL "libGL.so.3"
36
37
#elif defined(__OpenBSD__)
#define DEFAULT_OPENGL "libGL.so.4.0"
39
#define DEFAULT_OPENGL "libGL.so.1"
42
43
44
45
46
47
#ifndef GLX_ARB_multisample
#define GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB 100000
#define GLX_SAMPLES_ARB 100001
#endif
48
49
/* GLX_EXT_visual_rating stuff that might not be in the system headers... */
#ifndef GLX_VISUAL_CAVEAT_EXT
50
#define GLX_VISUAL_CAVEAT_EXT 0x20
51
52
#endif
#ifndef GLX_NONE_EXT
53
#define GLX_NONE_EXT 0x8000
54
55
#endif
#ifndef GLX_SLOW_VISUAL_EXT
56
#define GLX_SLOW_VISUAL_EXT 0x8001
57
58
#endif
#ifndef GLX_NON_CONFORMANT_VISUAL_EXT
59
60
61
#define GLX_NON_CONFORMANT_VISUAL_EXT 0x800D
#endif
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
#if SDL_VIDEO_OPENGL_GLX
static int glXExtensionSupported(_THIS, const char *extension)
{
const char *extensions;
const char *start;
const char *where, *terminator;
/* Extension names should not have spaces. */
where = SDL_strchr(extension, ' ');
if ( where || *extension == '\0' ) {
return 0;
}
extensions = this->gl_data->glXQueryExtensionsString(GFX_Display,SDL_Screen);
/* It takes a bit of care to be fool-proof about parsing the
* OpenGL extensions string. Don't be fooled by sub-strings, etc.
*/
80
81
82
83
84
/* http://bugs.debian.org/537487 */
if (extensions == NULL) {
return 0;
}
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
start = extensions;
for (;;) {
where = SDL_strstr(start, extension);
if (!where) break;
terminator = where + strlen(extension);
if (where == start || *(where - 1) == ' ')
if (*terminator == ' ' || *terminator == '\0') return 1;
start = terminator;
}
return 0;
}
#endif /* SDL_VIDEO_OPENGL_GLX */
102
103
XVisualInfo *X11_GL_GetVisual(_THIS)
{
104
#if SDL_VIDEO_OPENGL_GLX
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
/* 64 seems nice. */
int attribs[64];
int i;
/* load the gl driver from a default path */
if ( ! this->gl_config.driver_loaded ) {
/* no driver has been loaded, use default (ourselves) */
if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
return NULL;
}
}
/* See if we already have a window which we must use */
if ( SDL_windowid ) {
XWindowAttributes a;
XVisualInfo vi_in;
int out_count;
123
XGetWindowAttributes(SDL_Display, SDL_Window, &a);
124
vi_in.screen = SDL_Screen;
125
126
vi_in.visualid = XVisualIDFromVisual(a.visual);
glx_visualinfo = XGetVisualInfo(SDL_Display,
127
128
129
130
131
VisualScreenMask|VisualIDMask, &vi_in, &out_count);
return glx_visualinfo;
}
/* Setup our GLX attributes according to the gl_config. */
132
133
i = 0;
attribs[i++] = GLX_RGBA;
134
135
136
137
138
139
140
141
142
143
144
145
146
attribs[i++] = GLX_RED_SIZE;
attribs[i++] = this->gl_config.red_size;
attribs[i++] = GLX_GREEN_SIZE;
attribs[i++] = this->gl_config.green_size;
attribs[i++] = GLX_BLUE_SIZE;
attribs[i++] = this->gl_config.blue_size;
if( this->gl_config.alpha_size ) {
attribs[i++] = GLX_ALPHA_SIZE;
attribs[i++] = this->gl_config.alpha_size;
}
if( this->gl_config.buffer_size ) {
147
148
attribs[i++] = GLX_BUFFER_SIZE;
attribs[i++] = this->gl_config.buffer_size;
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
}
if( this->gl_config.double_buffer ) {
attribs[i++] = GLX_DOUBLEBUFFER;
}
attribs[i++] = GLX_DEPTH_SIZE;
attribs[i++] = this->gl_config.depth_size;
if( this->gl_config.stencil_size ) {
attribs[i++] = GLX_STENCIL_SIZE;
attribs[i++] = this->gl_config.stencil_size;
}
if( this->gl_config.accum_red_size ) {
164
attribs[i++] = GLX_ACCUM_RED_SIZE;
165
166
167
168
attribs[i++] = this->gl_config.accum_red_size;
}
if( this->gl_config.accum_green_size ) {
169
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
170
171
172
173
attribs[i++] = this->gl_config.accum_green_size;
}
if( this->gl_config.accum_blue_size ) {
174
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
175
176
177
178
attribs[i++] = this->gl_config.accum_blue_size;
}
if( this->gl_config.accum_alpha_size ) {
179
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
180
181
182
attribs[i++] = this->gl_config.accum_alpha_size;
}
183
184
185
if( this->gl_config.stereo ) {
attribs[i++] = GLX_STEREO;
}
187
if( this->gl_config.multisamplebuffers ) {
188
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
189
attribs[i++] = this->gl_config.multisamplebuffers;
192
if( this->gl_config.multisamplesamples ) {
193
attribs[i++] = GLX_SAMPLES_ARB;
194
attribs[i++] = this->gl_config.multisamplesamples;
197
198
199
if( this->gl_config.accelerated >= 0 &&
glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
200
attribs[i++] = GLX_NONE_EXT;
201
202
}
203
#ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */
204
if ( !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) {
205
206
207
attribs[i++] = GLX_X_VISUAL_TYPE;
attribs[i++] = GLX_DIRECT_COLOR;
}
208
209
210
211
212
213
#endif
attribs[i++] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
#ifdef GLX_DIRECT_COLOR
214
if( !glx_visualinfo && !SDL_getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) { /* No DirectColor visual? Try again.. */
215
216
217
218
219
220
221
222
223
attribs[i-3] = None;
glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
SDL_Screen, attribs);
}
#endif
if( !glx_visualinfo ) {
SDL_SetError( "Couldn't find matching GLX visual");
return NULL;
}
224
225
226
/*
printf("Found GLX visual 0x%x\n", glx_visualinfo->visualid);
*/
227
228
229
230
231
232
233
234
235
236
return glx_visualinfo;
#else
SDL_SetError("X11 driver not configured with OpenGL");
return NULL;
#endif
}
int X11_GL_CreateWindow(_THIS, int w, int h)
{
int retval;
237
#if SDL_VIDEO_OPENGL_GLX
238
239
240
241
242
243
244
245
246
247
248
249
XSetWindowAttributes attributes;
unsigned long mask;
unsigned long black;
black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
SDL_Screen))
? BlackPixel(SDL_Display, SDL_Screen) : 0;
attributes.background_pixel = black;
attributes.border_pixel = black;
attributes.colormap = SDL_XColorMap;
mask = CWBackPixel | CWBorderPixel | CWColormap;
250
SDL_Window = XCreateWindow(SDL_Display, WMwindow,
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
0, 0, w, h, 0, glx_visualinfo->depth,
InputOutput, glx_visualinfo->visual,
mask, &attributes);
if ( !SDL_Window ) {
SDL_SetError("Could not create window");
return -1;
}
retval = 0;
#else
SDL_SetError("X11 driver not configured with OpenGL");
retval = -1;
#endif
return(retval);
}
int X11_GL_CreateContext(_THIS)
{
int retval;
269
#if SDL_VIDEO_OPENGL_GLX
271
/* We do this to create a clean separation between X and GLX errors. */
272
XSync( SDL_Display, False );
273
274
glx_context = this->gl_data->glXCreateContext(GFX_Display,
glx_visualinfo, NULL, True);
275
XSync( GFX_Display, False );
277
if ( glx_context == NULL ) {
278
SDL_SetError("Could not create GL context");
279
280
281
282
return(-1);
}
if ( X11_GL_MakeCurrent(this) < 0 ) {
return(-1);
283
284
}
gl_active = 1;
286
if ( !glXExtensionSupported(this, "GLX_SGI_swap_control") ) {
287
288
this->gl_data->glXSwapIntervalSGI = NULL;
}
289
if ( !glXExtensionSupported(this, "GLX_MESA_swap_control") ) {
290
291
292
this->gl_data->glXSwapIntervalMESA = NULL;
}
if ( this->gl_config.swap_control >= 0 ) {
293
int rc = -1;
294
if ( this->gl_data->glXSwapIntervalMESA ) {
295
rc = this->gl_data->glXSwapIntervalMESA(this->gl_config.swap_control);
296
} else if ( this->gl_data->glXSwapIntervalSGI ) {
297
298
299
300
rc = this->gl_data->glXSwapIntervalSGI(this->gl_config.swap_control);
}
if (rc == 0) {
this->gl_data->swap_interval = this->gl_config.swap_control;
301
302
}
}
303
304
305
306
307
308
309
310
311
312
313
314
315
#else
SDL_SetError("X11 driver not configured with OpenGL");
#endif
if ( gl_active ) {
retval = 0;
} else {
retval = -1;
}
return(retval);
}
void X11_GL_Shutdown(_THIS)
{
316
#if SDL_VIDEO_OPENGL_GLX
317
318
319
320
321
322
323
324
325
326
/* Clean up OpenGL */
if( glx_context ) {
this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
if (glx_context != NULL)
this->gl_data->glXDestroyContext(GFX_Display, glx_context);
glx_context = NULL;
}
gl_active = 0;
327
#endif /* SDL_VIDEO_OPENGL_GLX */
328
329
}
330
#if SDL_VIDEO_OPENGL_GLX
331
332
333
334
335
/* Make the current context active */
int X11_GL_MakeCurrent(_THIS)
{
int retval;
337
338
339
340
341
342
retval = 0;
if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
SDL_Window, glx_context) ) {
SDL_SetError("Unable to make GL context current");
retval = -1;
}
343
XSync( GFX_Display, False );
344
345
346
347
348
349
350
351
352
353
354
355
/* More Voodoo X server workarounds... Grr... */
SDL_Lock_EventThread();
X11_CheckDGAMouse(this);
SDL_Unlock_EventThread();
return(retval);
}
/* Get attribute data from glX. */
int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
{
356
357
int retval = -1;
int unsupported = 0;
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
int glx_attrib = None;
switch( attrib ) {
case SDL_GL_RED_SIZE:
glx_attrib = GLX_RED_SIZE;
break;
case SDL_GL_GREEN_SIZE:
glx_attrib = GLX_GREEN_SIZE;
break;
case SDL_GL_BLUE_SIZE:
glx_attrib = GLX_BLUE_SIZE;
break;
case SDL_GL_ALPHA_SIZE:
glx_attrib = GLX_ALPHA_SIZE;
break;
case SDL_GL_DOUBLEBUFFER:
glx_attrib = GLX_DOUBLEBUFFER;
break;
case SDL_GL_BUFFER_SIZE:
glx_attrib = GLX_BUFFER_SIZE;
break;
case SDL_GL_DEPTH_SIZE:
glx_attrib = GLX_DEPTH_SIZE;
break;
case SDL_GL_STENCIL_SIZE:
glx_attrib = GLX_STENCIL_SIZE;
break;
case SDL_GL_ACCUM_RED_SIZE:
glx_attrib = GLX_ACCUM_RED_SIZE;
break;
case SDL_GL_ACCUM_GREEN_SIZE:
glx_attrib = GLX_ACCUM_GREEN_SIZE;
break;
case SDL_GL_ACCUM_BLUE_SIZE:
glx_attrib = GLX_ACCUM_BLUE_SIZE;
break;
case SDL_GL_ACCUM_ALPHA_SIZE:
glx_attrib = GLX_ACCUM_ALPHA_SIZE;
break;
397
398
399
case SDL_GL_STEREO:
glx_attrib = GLX_STEREO;
break;
400
case SDL_GL_MULTISAMPLEBUFFERS:
401
402
glx_attrib = GLX_SAMPLE_BUFFERS_ARB;
break;
403
case SDL_GL_MULTISAMPLESAMPLES:
404
405
glx_attrib = GLX_SAMPLES_ARB;
break;
406
407
408
409
410
411
412
413
414
415
416
case SDL_GL_ACCELERATED_VISUAL:
if ( glXExtensionSupported(this, "GLX_EXT_visual_rating") ) {
glx_attrib = GLX_VISUAL_CAVEAT_EXT;
retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
if ( *value == GLX_SLOW_VISUAL_EXT ) {
*value = SDL_FALSE;
} else {
*value = SDL_TRUE;
}
return retval;
} else {
417
unsupported = 1;
418
419
}
break;
420
case SDL_GL_SWAP_CONTROL:
421
422
423
if ( ( this->gl_data->glXSwapIntervalMESA ) ||
( this->gl_data->glXSwapIntervalSGI ) ) {
*value = this->gl_data->swap_interval;
425
} else {
426
unsupported = 1;
427
428
}
break;
429
default:
430
431
unsupported = 1;
break;
432
433
}
434
435
436
437
438
if (unsupported) {
SDL_SetError("OpenGL attribute is unsupported on this system");
} else {
retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
}
439
440
441
442
443
444
445
446
return retval;
}
void X11_GL_SwapBuffers(_THIS)
{
this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
}
447
#endif /* SDL_VIDEO_OPENGL_GLX */
449
450
451
452
453
454
455
456
457
458
459
460
#define OPENGL_REQUIRS_DLOPEN
#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
#include <dlfcn.h>
#define GL_LoadObject(X) dlopen(X, (RTLD_NOW|RTLD_GLOBAL))
#define GL_LoadFunction dlsym
#define GL_UnloadObject dlclose
#else
#define GL_LoadObject SDL_LoadObject
#define GL_LoadFunction SDL_LoadFunction
#define GL_UnloadObject SDL_UnloadObject
#endif
461
462
void X11_GL_UnloadLibrary(_THIS)
{
463
#if SDL_VIDEO_OPENGL_GLX
464
if ( this->gl_config.driver_loaded ) {
467
468
469
470
471
472
473
this->gl_data->glXGetProcAddress = NULL;
this->gl_data->glXChooseVisual = NULL;
this->gl_data->glXCreateContext = NULL;
this->gl_data->glXDestroyContext = NULL;
this->gl_data->glXMakeCurrent = NULL;
this->gl_data->glXSwapBuffers = NULL;
474
475
this->gl_data->glXSwapIntervalSGI = NULL;
this->gl_data->glXSwapIntervalMESA = NULL;
476
477
478
479
480
481
482
this->gl_config.dll_handle = NULL;
this->gl_config.driver_loaded = 0;
}
#endif
}
483
#if SDL_VIDEO_OPENGL_GLX
485
486
487
/* Passing a NULL path means load pointers from the application */
int X11_GL_LoadLibrary(_THIS, const char* path)
{
488
void* handle = NULL;
490
491
492
493
494
495
if ( gl_active ) {
SDL_SetError("OpenGL context already created");
return -1;
}
if ( path == NULL ) {
496
path = SDL_getenv("SDL_VIDEO_GL_DRIVER");
497
498
499
if ( path == NULL ) {
path = DEFAULT_OPENGL;
}
503
if ( handle == NULL ) {
504
505
506
#if defined(OPENGL_REQUIRS_DLOPEN) && defined(SDL_LOADSO_DLOPEN)
SDL_SetError("Failed loading %s", path);
#else
507
/* SDL_LoadObject() will call SDL_SetError() for us. */
510
511
512
513
514
}
/* Unload the old driver and reset the pointers */
X11_GL_UnloadLibrary(this);
515
516
517
/* Save the handle for X11_GL_GetProcAddress() */
this->gl_config.dll_handle = handle;
518
/* Load new function pointers */
519
this->gl_data->glXGetProcAddress =
521
this->gl_data->glXChooseVisual =
522
(XVisualInfo *(*)(Display *, int, int *)) X11_GL_GetProcAddress(this, "glXChooseVisual");
523
this->gl_data->glXCreateContext =
524
(GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) X11_GL_GetProcAddress(this, "glXCreateContext");
525
this->gl_data->glXDestroyContext =
526
(void (*)(Display *, GLXContext)) X11_GL_GetProcAddress(this, "glXDestroyContext");
527
this->gl_data->glXMakeCurrent =
528
(int (*)(Display *, GLXDrawable, GLXContext)) X11_GL_GetProcAddress(this, "glXMakeCurrent");
529
this->gl_data->glXSwapBuffers =
530
(void (*)(Display *, GLXDrawable)) X11_GL_GetProcAddress(this, "glXSwapBuffers");
531
this->gl_data->glXGetConfig =
532
(int (*)(Display *, XVisualInfo *, int, int *)) X11_GL_GetProcAddress(this, "glXGetConfig");
533
this->gl_data->glXQueryExtensionsString =
534
(const char *(*)(Display *, int)) X11_GL_GetProcAddress(this, "glXQueryExtensionsString");
535
this->gl_data->glXSwapIntervalSGI =
536
(int (*)(int)) X11_GL_GetProcAddress(this, "glXSwapIntervalSGI");
537
this->gl_data->glXSwapIntervalMESA =
538
(GLint (*)(unsigned)) X11_GL_GetProcAddress(this, "glXSwapIntervalMESA");
540
541
542
543
544
if ( (this->gl_data->glXChooseVisual == NULL) ||
(this->gl_data->glXCreateContext == NULL) ||
(this->gl_data->glXDestroyContext == NULL) ||
(this->gl_data->glXMakeCurrent == NULL) ||
(this->gl_data->glXSwapBuffers == NULL) ||
545
546
(this->gl_data->glXGetConfig == NULL) ||
(this->gl_data->glXQueryExtensionsString == NULL)) {
547
548
GL_UnloadObject(this->gl_config.dll_handle);
this->gl_config.dll_handle = NULL;
549
550
551
552
553
554
SDL_SetError("Could not retrieve OpenGL functions");
return -1;
}
this->gl_config.driver_loaded = 1;
if ( path ) {
555
556
SDL_strlcpy(this->gl_config.driver_path, path,
SDL_arraysize(this->gl_config.driver_path));
557
} else {
558
*this->gl_config.driver_path = '\0';
559
560
561
562
563
564
565
}
return 0;
}
void *X11_GL_GetProcAddress(_THIS, const char* proc)
{
if ( this->gl_data->glXGetProcAddress ) {
566
return this->gl_data->glXGetProcAddress((const GLubyte *)proc);
567
}
568
return GL_LoadFunction(this->gl_config.dll_handle, proc);
569
570
}
571
#endif /* SDL_VIDEO_OPENGL_GLX */