Repository navigation
Expand file tree
/
Copy pathSDL_x11opengl.c
More file actions
1030 lines (878 loc) · 37.2 KB
/
Copy pathSDL_x11opengl.c
File metadata and controls
1030 lines (878 loc) · 37.2 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
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
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
/*
Simple DirectMedia Layer
Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
Copyright (C) 2021 NVIDIA Corporation
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:
1. The origin of this software must not be misrepresented; you must not
claim that you wrote the original software. If you use this software
in a product, an acknowledgment in the product documentation would be
appreciated but is not required.
2. Altered source versions must be plainly marked as such, and must not be
misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.
*/
#include "../../SDL_internal.h"
#ifdef SDL_VIDEO_DRIVER_X11
#include "SDL_x11video.h"
#include "SDL_hints.h"
/* GLX implementation of SDL OpenGL support */
#ifdef SDL_VIDEO_OPENGL_GLX
#include "SDL_loadso.h"
#include "SDL_x11opengles.h"
#if defined(__IRIX__) || defined(__NetBSD__) || defined(__OpenBSD__)
/*
* IRIX doesn't have a GL library versioning system.
* NetBSD and OpenBSD have different GL library versions depending on how
* the library was installed.
*/
#define DEFAULT_OPENGL "libGL.so"
#elif defined(__MACOSX__)
#define DEFAULT_OPENGL "/opt/X11/lib/libGL.1.dylib"
#elif defined(__QNXNTO__)
#define DEFAULT_OPENGL "libGL.so.3"
#else
#define DEFAULT_OPENGL "libGL.so.1"
#endif
#ifndef GLX_NONE_EXT
#define GLX_NONE_EXT 0x8000
#endif
#ifndef GLX_ARB_multisample
#define GLX_ARB_multisample
#define GLX_SAMPLE_BUFFERS_ARB 100000
#define GLX_SAMPLES_ARB 100001
#endif
#ifndef GLX_EXT_visual_rating
#define GLX_EXT_visual_rating
#define GLX_VISUAL_CAVEAT_EXT 0x20
#define GLX_NONE_EXT 0x8000
#define GLX_SLOW_VISUAL_EXT 0x8001
#define GLX_NON_CONFORMANT_VISUAL_EXT 0x800D
#endif
#ifndef GLX_EXT_visual_info
#define GLX_EXT_visual_info
#define GLX_X_VISUAL_TYPE_EXT 0x22
#define GLX_DIRECT_COLOR_EXT 0x8003
#endif
#ifndef GLX_ARB_create_context
#define GLX_ARB_create_context
#define GLX_CONTEXT_MAJOR_VERSION_ARB 0x2091
#define GLX_CONTEXT_MINOR_VERSION_ARB 0x2092
#define GLX_CONTEXT_FLAGS_ARB 0x2094
#define GLX_CONTEXT_DEBUG_BIT_ARB 0x0001
#define GLX_CONTEXT_FORWARD_COMPATIBLE_BIT_ARB 0x0002
/* Typedef for the GL 3.0 context creation function */
typedef GLXContext (*PFNGLXCREATECONTEXTATTRIBSARBPROC)(Display *dpy,
GLXFBConfig config,
GLXContext
share_context,
Bool direct,
const int
*attrib_list);
#endif
#ifndef GLX_ARB_create_context_profile
#define GLX_ARB_create_context_profile
#define GLX_CONTEXT_PROFILE_MASK_ARB 0x9126
#define GLX_CONTEXT_CORE_PROFILE_BIT_ARB 0x00000001
#define GLX_CONTEXT_COMPATIBILITY_PROFILE_BIT_ARB 0x00000002
#endif
#ifndef GLX_ARB_create_context_robustness
#define GLX_ARB_create_context_robustness
#define GLX_CONTEXT_ROBUST_ACCESS_BIT_ARB 0x00000004
#define GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB 0x8256
#define GLX_NO_RESET_NOTIFICATION_ARB 0x8261
#define GLX_LOSE_CONTEXT_ON_RESET_ARB 0x8252
#endif
#ifndef GLX_EXT_create_context_es2_profile
#define GLX_EXT_create_context_es2_profile
#ifndef GLX_CONTEXT_ES2_PROFILE_BIT_EXT
#define GLX_CONTEXT_ES2_PROFILE_BIT_EXT 0x00000002
#endif
#endif
#ifndef GLX_ARB_framebuffer_sRGB
#define GLX_ARB_framebuffer_sRGB
#ifndef GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB
#define GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB 0x20B2
#endif
#endif
#ifndef GLX_ARB_fbconfig_float
#define GLX_ARB_fbconfig_float
#ifndef GLX_RGBA_FLOAT_TYPE_ARB
#define GLX_RGBA_FLOAT_TYPE_ARB 0x20B9
#endif
#ifndef GLX_RGBA_FLOAT_BIT_ARB
#define GLX_RGBA_FLOAT_BIT_ARB 0x00000004
#endif
#endif
#ifndef GLX_ARB_create_context_no_error
#define GLX_ARB_create_context_no_error
#ifndef GLX_CONTEXT_OPENGL_NO_ERROR_ARB
#define GLX_CONTEXT_OPENGL_NO_ERROR_ARB 0x31B3
#endif
#endif
#ifndef GLX_EXT_swap_control
#define GLX_SWAP_INTERVAL_EXT 0x20F1
#define GLX_MAX_SWAP_INTERVAL_EXT 0x20F2
#endif
#ifndef GLX_EXT_swap_control_tear
#define GLX_LATE_SWAPS_TEAR_EXT 0x20F3
#endif
#ifndef GLX_ARB_context_flush_control
#define GLX_ARB_context_flush_control
#define GLX_CONTEXT_RELEASE_BEHAVIOR_ARB 0x2097
#define GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB 0x0000
#define GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB 0x2098
#endif
#define OPENGL_REQUIRES_DLOPEN
#if defined(OPENGL_REQUIRES_DLOPEN) && defined(HAVE_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
static void X11_GL_InitExtensions(_THIS);
int X11_GL_LoadLibrary(_THIS, const char *path)
{
Display *display;
void *handle;
if (_this->gl_data) {
return SDL_SetError("OpenGL context already created");
}
/* Load the OpenGL library */
if (path == NULL) {
path = SDL_getenv("SDL_OPENGL_LIBRARY");
}
if (path == NULL) {
path = DEFAULT_OPENGL;
}
_this->gl_config.dll_handle = GL_LoadObject(path);
if (!_this->gl_config.dll_handle) {
#if defined(OPENGL_REQUIRES_DLOPEN) && defined(HAVE_DLOPEN)
SDL_SetError("Failed loading %s: %s", path, dlerror());
#endif
return -1;
}
SDL_strlcpy(_this->gl_config.driver_path, path,
SDL_arraysize(_this->gl_config.driver_path));
/* Allocate OpenGL memory */
_this->gl_data =
(struct SDL_GLDriverData *)SDL_calloc(1,
sizeof(struct
SDL_GLDriverData));
if (!_this->gl_data) {
return SDL_OutOfMemory();
}
/* Load function pointers */
handle = _this->gl_config.dll_handle;
_this->gl_data->glXQueryExtension =
(Bool(*)(Display *, int *, int *))
GL_LoadFunction(handle, "glXQueryExtension");
_this->gl_data->glXGetProcAddress =
(void *(*)(const GLubyte *))
GL_LoadFunction(handle, "glXGetProcAddressARB");
_this->gl_data->glXChooseVisual =
(XVisualInfo * (*)(Display *, int, int *))
X11_GL_GetProcAddress(_this, "glXChooseVisual");
_this->gl_data->glXCreateContext =
(GLXContext(*)(Display *, XVisualInfo *, GLXContext, int))
X11_GL_GetProcAddress(_this, "glXCreateContext");
_this->gl_data->glXDestroyContext =
(void (*)(Display *, GLXContext))
X11_GL_GetProcAddress(_this, "glXDestroyContext");
_this->gl_data->glXMakeCurrent =
(int (*)(Display *, GLXDrawable, GLXContext))
X11_GL_GetProcAddress(_this, "glXMakeCurrent");
_this->gl_data->glXSwapBuffers =
(void (*)(Display *, GLXDrawable))
X11_GL_GetProcAddress(_this, "glXSwapBuffers");
_this->gl_data->glXQueryDrawable =
(void (*)(Display *, GLXDrawable, int, unsigned int *))
X11_GL_GetProcAddress(_this, "glXQueryDrawable");
if (!_this->gl_data->glXQueryExtension ||
!_this->gl_data->glXChooseVisual ||
!_this->gl_data->glXCreateContext ||
!_this->gl_data->glXDestroyContext ||
!_this->gl_data->glXMakeCurrent ||
!_this->gl_data->glXSwapBuffers) {
return SDL_SetError("Could not retrieve OpenGL functions");
}
display = ((SDL_VideoData *)_this->driverdata)->display;
if (!_this->gl_data->glXQueryExtension(display, &_this->gl_data->errorBase, &_this->gl_data->eventBase)) {
return SDL_SetError("GLX is not supported");
}
_this->gl_data->swap_interval_tear_behavior = SDL_SWAPINTERVALTEAR_UNTESTED;
/* Initialize extensions */
/* See lengthy comment about the inc/dec in
../windows/SDL_windowsopengl.c. */
++_this->gl_config.driver_loaded;
X11_GL_InitExtensions(_this);
--_this->gl_config.driver_loaded;
/* If we need a GL ES context and there's no
* GLX_EXT_create_context_es2_profile extension, switch over to X11_GLES functions
*/
if (((_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES) ||
SDL_GetHintBoolean(SDL_HINT_VIDEO_X11_FORCE_EGL, SDL_FALSE)) &&
X11_GL_UseEGL(_this) ) {
#ifdef SDL_VIDEO_OPENGL_EGL
X11_GL_UnloadLibrary(_this);
_this->GL_LoadLibrary = X11_GLES_LoadLibrary;
_this->GL_GetProcAddress = X11_GLES_GetProcAddress;
_this->GL_UnloadLibrary = X11_GLES_UnloadLibrary;
_this->GL_CreateContext = X11_GLES_CreateContext;
_this->GL_MakeCurrent = X11_GLES_MakeCurrent;
_this->GL_SetSwapInterval = X11_GLES_SetSwapInterval;
_this->GL_GetSwapInterval = X11_GLES_GetSwapInterval;
_this->GL_SwapWindow = X11_GLES_SwapWindow;
_this->GL_DeleteContext = X11_GLES_DeleteContext;
return X11_GLES_LoadLibrary(_this, NULL);
#else
return SDL_SetError("SDL not configured with EGL support");
#endif
}
return 0;
}
void *X11_GL_GetProcAddress(_THIS, const char *proc)
{
if (_this->gl_data->glXGetProcAddress) {
return _this->gl_data->glXGetProcAddress((const GLubyte *)proc);
}
return GL_LoadFunction(_this->gl_config.dll_handle, proc);
}
void X11_GL_UnloadLibrary(_THIS)
{
/* Don't actually unload the library, since it may have registered
* X11 shutdown hooks, per the notes at:
* http://dri.sourceforge.net/doc/DRIuserguide.html
*/
#if 0
GL_UnloadObject(_this->gl_config.dll_handle);
_this->gl_config.dll_handle = NULL;
#endif
/* Free OpenGL memory */
SDL_free(_this->gl_data);
_this->gl_data = NULL;
}
static SDL_bool HasExtension(const char *extension, const char *extensions)
{
const char *start;
const char *where, *terminator;
if (!extensions) {
return SDL_FALSE;
}
/* Extension names should not have spaces. */
where = SDL_strchr(extension, ' ');
if (where || *extension == '\0') {
return SDL_FALSE;
}
/* It takes a bit of care to be fool-proof about parsing the
* OpenGL extensions string. Don't be fooled by sub-strings,
* etc. */
start = extensions;
for (;;) {
where = SDL_strstr(start, extension);
if (!where) {
break;
}
terminator = where + SDL_strlen(extension);
if (where == start || *(where - 1) == ' ') {
if (*terminator == ' ' || *terminator == '\0') {
return SDL_TRUE;
}
}
start = terminator;
}
return SDL_FALSE;
}
static void X11_GL_InitExtensions(_THIS)
{
Display *display = ((SDL_VideoData *)_this->driverdata)->display;
const int screen = DefaultScreen(display);
XVisualInfo *vinfo = NULL;
Window w = 0;
GLXContext prev_ctx = 0;
GLXDrawable prev_drawable = 0;
GLXContext context = 0;
const char *(*glXQueryExtensionsStringFunc)(Display *, int);
const char *extensions;
vinfo = X11_GL_GetVisual(_this, display, screen);
if (vinfo) {
GLXContext (*glXGetCurrentContextFunc)(void) =
(GLXContext(*)(void))
X11_GL_GetProcAddress(_this, "glXGetCurrentContext");
GLXDrawable (*glXGetCurrentDrawableFunc)(void) =
(GLXDrawable(*)(void))
X11_GL_GetProcAddress(_this, "glXGetCurrentDrawable");
if (glXGetCurrentContextFunc && glXGetCurrentDrawableFunc) {
XSetWindowAttributes xattr;
prev_ctx = glXGetCurrentContextFunc();
prev_drawable = glXGetCurrentDrawableFunc();
xattr.background_pixel = 0;
xattr.border_pixel = 0;
xattr.colormap =
X11_XCreateColormap(display, RootWindow(display, screen),
vinfo->visual, AllocNone);
w = X11_XCreateWindow(display, RootWindow(display, screen), 0, 0,
32, 32, 0, vinfo->depth, InputOutput, vinfo->visual,
(CWBackPixel | CWBorderPixel | CWColormap), &xattr);
context = _this->gl_data->glXCreateContext(display, vinfo,
NULL, True);
if (context) {
_this->gl_data->glXMakeCurrent(display, w, context);
}
}
X11_XFree(vinfo);
}
glXQueryExtensionsStringFunc =
(const char *(*)(Display *, int))X11_GL_GetProcAddress(_this,
"glXQueryExtensionsString");
if (glXQueryExtensionsStringFunc) {
extensions = glXQueryExtensionsStringFunc(display, screen);
} else {
extensions = NULL;
}
/* Check for GLX_EXT_swap_control(_tear) */
_this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_FALSE;
if (HasExtension("GLX_EXT_swap_control", extensions)) {
_this->gl_data->glXSwapIntervalEXT =
(void (*)(Display *, GLXDrawable, int))
X11_GL_GetProcAddress(_this, "glXSwapIntervalEXT");
if (HasExtension("GLX_EXT_swap_control_tear", extensions)) {
_this->gl_data->HAS_GLX_EXT_swap_control_tear = SDL_TRUE;
}
}
/* Check for GLX_MESA_swap_control */
if (HasExtension("GLX_MESA_swap_control", extensions)) {
_this->gl_data->glXSwapIntervalMESA =
(int (*)(int))X11_GL_GetProcAddress(_this, "glXSwapIntervalMESA");
_this->gl_data->glXGetSwapIntervalMESA =
(int (*)(void))X11_GL_GetProcAddress(_this,
"glXGetSwapIntervalMESA");
}
/* Check for GLX_SGI_swap_control */
if (HasExtension("GLX_SGI_swap_control", extensions)) {
_this->gl_data->glXSwapIntervalSGI =
(int (*)(int))X11_GL_GetProcAddress(_this, "glXSwapIntervalSGI");
}
/* Check for GLX_ARB_create_context */
if (HasExtension("GLX_ARB_create_context", extensions)) {
_this->gl_data->glXCreateContextAttribsARB =
(GLXContext(*)(Display *, GLXFBConfig, GLXContext, Bool, const int *))
X11_GL_GetProcAddress(_this, "glXCreateContextAttribsARB");
_this->gl_data->glXChooseFBConfig =
(GLXFBConfig * (*)(Display *, int, const int *, int *))
X11_GL_GetProcAddress(_this, "glXChooseFBConfig");
_this->gl_data->glXGetVisualFromFBConfig =
(XVisualInfo * (*)(Display *, GLXFBConfig))
X11_GL_GetProcAddress(_this, "glXGetVisualFromFBConfig");
}
/* Check for GLX_EXT_visual_rating */
if (HasExtension("GLX_EXT_visual_rating", extensions)) {
_this->gl_data->HAS_GLX_EXT_visual_rating = SDL_TRUE;
}
/* Check for GLX_EXT_visual_info */
if (HasExtension("GLX_EXT_visual_info", extensions)) {
F438
_this->gl_data->HAS_GLX_EXT_visual_info = SDL_TRUE;
}
/* Check for GLX_EXT_create_context_es2_profile */
if (HasExtension("GLX_EXT_create_context_es2_profile", extensions)) {
/* this wants to call glGetString(), so it needs a context. */
/* !!! FIXME: it would be nice not to make a context here though! */
if (context) {
SDL_GL_DeduceMaxSupportedESProfile(
&_this->gl_data->es_profile_max_supported_version.major,
&_this->gl_data->es_profile_max_supported_version.minor);
}
}
/* Check for GLX_ARB_context_flush_control */
if (HasExtension("GLX_ARB_context_flush_control", extensions)) {
_this->gl_data->HAS_GLX_ARB_context_flush_control = SDL_TRUE;
}
/* Check for GLX_ARB_create_context_robustness */
if (HasExtension("GLX_ARB_create_context_robustness", extensions)) {
_this->gl_data->HAS_GLX_ARB_create_context_robustness = SDL_TRUE;
}
/* Check for GLX_ARB_create_context_no_error */
if (HasExtension("GLX_ARB_create_context_no_error", extensions)) {
_this->gl_data->HAS_GLX_ARB_create_context_no_error = SDL_TRUE;
}
if (context) {
_this->gl_data->glXMakeCurrent(display, None, NULL);
_this->gl_data->glXDestroyContext(display, context);
if (prev_ctx && prev_drawable) {
_this->gl_data->glXMakeCurrent(display, prev_drawable, prev_ctx);
}
}
if (w) {
X11_XDestroyWindow(display, w);
}
X11_PumpEvents(_this);
}
/* glXChooseVisual and glXChooseFBConfig have some small differences in
* the attribute encoding, it can be chosen with the for_FBConfig parameter.
* Some targets fail if you use GLX_X_VISUAL_TYPE_EXT/GLX_DIRECT_COLOR_EXT,
* so it gets specified last if used and is pointed to by *_pvistypeattr.
* In case of failure, if that pointer is not NULL, set that pointer to None
* and try again.
*/
static int X11_GL_GetAttributes(_THIS, Display *display, int screen, int *attribs, int size, Bool for_FBConfig, int **_pvistypeattr)
{
int i = 0;
const int MAX_ATTRIBUTES = 64;
int *pvistypeattr = NULL;
/* assert buffer is large enough to hold all SDL attributes. */
SDL_assert(size >= MAX_ATTRIBUTES);
/* Setup our GLX attributes according to the gl_config. */
if (for_FBConfig) {
attribs[i++] = GLX_RENDER_TYPE;
if (_this->gl_config.floatbuffers) {
attribs[i++] = GLX_RGBA_FLOAT_BIT_ARB;
} else {
attribs[i++] = GLX_RGBA_BIT;
}
} else {
attribs[i++] = GLX_RGBA;
}
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.double_buffer) {
attribs[i++] = GLX_DOUBLEBUFFER;
if (for_FBConfig) {
attribs[i++] = True;
}
}
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) {
attribs[i++] = GLX_ACCUM_RED_SIZE;
attribs[i++] = _this->gl_config.accum_red_size;
}
if (_this->gl_config.accum_green_size) {
attribs[i++] = GLX_ACCUM_GREEN_SIZE;
attribs[i++] = _this->gl_config.accum_green_size;
}
if (_this->gl_config.accum_blue_size) {
attribs[i++] = GLX_ACCUM_BLUE_SIZE;
attribs[i++] = _this->gl_config.accum_blue_size;
}
if (_this->gl_config.accum_alpha_size) {
attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
attribs[i++] = _this->gl_config.accum_alpha_size;
}
if (_this->gl_config.stereo) {
attribs[i++] = GLX_STEREO;
if (for_FBConfig) {
attribs[i++] = True;
}
}
if (_this->gl_config.multisamplebuffers) {
attribs[i++] = GLX_SAMPLE_BUFFERS_ARB;
attribs[i++] = _this->gl_config.multisamplebuffers;
}
if (_this->gl_config.multisamplesamples) {
attribs[i++] = GLX_SAMPLES_ARB;
attribs[i++] = _this->gl_config.multisamplesamples;
}
if (_this->gl_config.floatbuffers) {
attribs[i++] = GLX_RENDER_TYPE;
attribs[i++] = GLX_RGBA_FLOAT_TYPE_ARB;
}
if (_this->gl_config.framebuffer_srgb_capable) {
attribs[i++] = GLX_FRAMEBUFFER_SRGB_CAPABLE_ARB;
attribs[i++] = True; /* always needed, for_FBConfig or not! */
}
if (_this->gl_config.accelerated >= 0 &&
_this->gl_data->HAS_GLX_EXT_visual_rating) {
attribs[i++] = GLX_VISUAL_CAVEAT_EXT;
attribs[i++] = _this->gl_config.accelerated ? GLX_NONE_EXT : GLX_SLOW_VISUAL_EXT;
}
/* If we're supposed to use DirectColor visuals, and we've got the
EXT_visual_info extension, then add GLX_X_VISUAL_TYPE_EXT. */
if (X11_UseDirectColorVisuals() &&
_this->gl_data->HAS_GLX_EXT_visual_info) {
pvistypeattr = &attribs[i];
attribs[i++] = GLX_X_VISUAL_TYPE_EXT;
attribs[i++] = GLX_DIRECT_COLOR_EXT;
}
attribs[i++] = None;
SDL_assert(i <= MAX_ATTRIBUTES);
if (_pvistypeattr) {
*_pvistypeattr = pvistypeattr;
}
return i;
}
XVisualInfo *X11_GL_GetVisual(_THIS, Display *display, int screen)
{
/* 64 seems nice. */
int attribs[64];
XVisualInfo *vinfo = NULL;
int *pvistypeattr = NULL;
if (!_this->gl_data) {
/* The OpenGL library wasn't loaded, SDL_GetError() should have info */
return NULL;
}
if (_this->gl_data->glXChooseFBConfig &&
_this->gl_data->glXGetVisualFromFBConfig) {
GLXFBConfig *framebuffer_config = NULL;
int fbcount = 0;
X11_GL_GetAttributes(_this, display, screen, attribs, 64, SDL_TRUE, &pvistypeattr);
framebuffer_config = _this->gl_data->glXChooseFBConfig(display, screen, attribs, &fbcount);
if (!framebuffer_config && (pvistypeattr != NULL)) {
*pvistypeattr = None;
framebuffer_config = _this->gl_data->glXChooseFBConfig(display, screen, attribs, &fbcount);
}
if (framebuffer_config) {
vinfo = _this->gl_data->glXGetVisualFromFBConfig(display, framebuffer_config[0]);
}
X11_XFree(framebuffer_config);
}
if (!vinfo) {
X11_GL_GetAttributes(_this, display, screen, attribs, 64, SDL_FALSE, &pvistypeattr);
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
if (!vinfo && (pvistypeattr != NULL)) {
*pvistypeattr = None;
vinfo = _this->gl_data->glXChooseVisual(display, screen, attribs);
}
}
if (!vinfo) {
SDL_SetError("Couldn't find matching GLX visual");
}
return vinfo;
}
static int (*handler)(Display *, XErrorEvent *) = NULL;
static const char *errorHandlerOperation = NULL;
static int errorBase = 0;
static int errorCode = 0;
static int X11_GL_ErrorHandler(Display *d, XErrorEvent *e)
{
char *x11_error = NULL;
char x11_error_locale[256];
errorCode = e->error_code;
if (X11_XGetErrorText(d, errorCode, x11_error_locale, sizeof(x11_error_locale)) == Success) {
x11_error = SDL_iconv_string("UTF-8", "", x11_error_locale, SDL_strlen(x11_error_locale) + 1);
}
if (x11_error) {
SDL_SetError("Could not %s: %s", errorHandlerOperation, x11_error);
SDL_free(x11_error);
} else {
SDL_SetError("Could not %s: %i (Base %i)", errorHandlerOperation, errorCode, errorBase);
}
return (0);
}
SDL_bool X11_GL_UseEGL(_THIS)
{
SDL_assert(_this->gl_da
10BC8
ta != NULL);
if (SDL_GetHintBoolean(SDL_HINT_VIDEO_X11_FORCE_EGL, SDL_FALSE))
{
/* use of EGL has been requested, even for desktop GL */
return SDL_TRUE;
}
SDL_assert(_this->gl_config.profile_mask == SDL_GL_CONTEXT_PROFILE_ES);
return (SDL_GetHintBoolean(SDL_HINT_OPENGL_ES_DRIVER, SDL_FALSE) || _this->gl_config.major_version == 1 /* No GLX extension for OpenGL ES 1.x profiles. */
|| _this->gl_config.major_version > _this->gl_data->es_profile_max_supported_version.major || (_this->gl_config.major_version == _this->gl_data->es_profile_max_supported_version.major && _this->gl_config.minor_version > _this->gl_data->es_profile_max_supported_version.minor));
}
SDL_GLContext X11_GL_CreateContext(_THIS, SDL_Window *window)
{
SDL_WindowData *data = (SDL_WindowData *)window->driverdata;
Display *display = data->videodata->display;
int screen =
((SDL_DisplayData *)SDL_GetDisplayForWindow(window)->driverdata)->screen;
XWindowAttributes xattr;
XVisualInfo v, *vinfo;
int n;
GLXContext context = NULL, share_context;
if (_this->gl_config.share_with_current_context) {
share_context = (GLXContext)SDL_GL_GetCurrentContext();
} else {
share_context = NULL;
}
/* We do this to create a clean separation between X and GLX errors. */
X11_XSync(display, False);
errorHandlerOperation = "create GL context";
errorBase = _this->gl_data->errorBase;
errorCode = Success;
handler = X11_XSetErrorHandler(X11_GL_ErrorHandler);
X11_XGetWindowAttributes(display, data->xwindow, &xattr);
v.screen = screen;
v.visualid = X11_XVisualIDFromVisual(xattr.visual);
vinfo = X11_XGetVisualInfo(display, VisualScreenMask | VisualIDMask, &v, &n);
if (vinfo) {
if (_this->gl_config.major_version < 3 &&
_this->gl_config.profile_mask == 0 &&
_this->gl_config.flags == 0) {
/* Create legacy context */
context =
_this->gl_data->glXCreateContext(display, vinfo, share_context, True);
} else {
/* max 14 attributes plus terminator */
int attribs[15] = {
GLX_CONTEXT_MAJOR_VERSION_ARB,
_this->gl_config.major_version,
GLX_CONTEXT_MINOR_VERSION_ARB,
_this->gl_config.minor_version,
0
};
int iattr = 4;
/* SDL profile bits match GLX profile bits */
if (_this->gl_config.profile_mask != 0) {
attribs[iattr++] = GLX_CONTEXT_PROFILE_MASK_ARB;
attribs[iattr++] = _this->gl_config.profile_mask;
}
/* SDL flags match GLX flags */
if (_this->gl_config.flags != 0) {
attribs[iattr++] = GLX_CONTEXT_FLAGS_ARB;
attribs[iattr++] = _this->gl_config.flags;
}
/* only set if glx extension is available and not the default setting */
if ((_this->gl_data->HAS_GLX_ARB_context_flush_control) && (_this->gl_config.release_behavior == 0)) {
attribs[iattr++] = GLX_CONTEXT_RELEASE_BEHAVIOR_ARB;
attribs[iattr++] =
_this->gl_config.release_behavior ? GLX_CONTEXT_RELEASE_BEHAVIOR_FLUSH_ARB : GLX_CONTEXT_RELEASE_BEHAVIOR_NONE_ARB;
}
/* only set if glx extension is available and not the default setting */
if ((_this->gl_data->HAS_GLX_ARB_create_context_robustness) && (_this->gl_config.reset_notification != 0)) {
attribs[iattr++] = GLX_CONTEXT_RESET_NOTIFICATION_STRATEGY_ARB;
attribs[iattr++] =
_this->gl_config.reset_notification ? GLX_LOSE_CONTEXT_ON_RESET_ARB : GLX_NO_RESET_NOTIFICATION_ARB;
}
/* only set if glx extension is available and not the default setting */
if ((_this->gl_data->HAS_GLX_ARB_create_context_no_error) && (_this->gl_config.no_error != 0)) {
attribs[iattr++] = GLX_CONTEXT_OPENGL_NO_ERROR_ARB;
attribs[iattr++] = _this->gl_config.no_error;
}
attribs[iattr++] = 0;
/* Get a pointer to the context creation function for GL 3.0 */
if (!_this->gl_data->glXCreateContextAttribsARB) {
SDL_SetError("OpenGL 3.0 and later are not supported by this system");
} else {
int glxAttribs[64];
/* Create a GL 3.x context */
GLXFBConfig *framebuffer_config = NULL;
int fbcount = 0;
int *pvistypeattr = NULL;
X11_GL_GetAttributes(_this, display, screen, glxAttribs, 64, SDL_TRUE, &pvistypeattr);
if (_this->gl_data->glXChooseFBConfig) {
framebuffer_config = _this->gl_data->glXChooseFBConfig(display,
DefaultScreen(display), glxAttribs,
&fbcount);
if (!framebuffer_config && (pvistypeattr != NULL)) {
*pvistypeattr = None;
framebuffer_config = _this->gl_data->glXChooseFBConfig(display,
DefaultScreen(display), glxAttribs,
&fbcount);
}
if (framebuffer_config) {
context = _this->gl_data->glXCreateContextAttribsARB(display,
framebuffer_config[0],
share_context, True, attribs);
X11_XFree(framebuffer_config);
}
}
}
}
X11_XFree(vinfo);
}
X11_XSync(display, False);
X11_XSetErrorHandler(handler);
if (!context) {
if (errorCode == Success) {
SDL_SetError("Could not create GL context");
}
return NULL;
}
if (X11_GL_MakeCurrent(_this, window, context) < 0) {
X11_GL_DeleteContext(_this, context);
return NULL;
}
return context;
}
int X11_GL_MakeCurrent(_THIS, SDL_Window *window, SDL_GLContext context)
{
Display *display = ((SDL_VideoData *)_this->driverdata)->display;
Window drawable =
(context ? ((SDL_WindowData *)window->driverdata)->xwindow : None);
GLXContext glx_context = (GLXContext)context;
int rc;
if (!_this->gl_data) {
return SDL_SetError("OpenGL not initialized");
}
/* We do this to create a clean separation between X and GLX errors. */
X11_XSync(display, False);
errorHandlerOperation = "make GL context current";
errorBase = _this->gl_data->errorBase;
errorCode = Success;
handler = X11_XSetErrorHandler(X11_GL_ErrorHandler);
rc = _this->gl_data->glXMakeCurrent(display, drawable, glx_context);
X11_XSetErrorHandler(handler);
if (errorCode != Success) { /* uhoh, an X error was thrown! */
return -1; /* the error handler called SDL_SetError() already. */
} else if (!rc) { /* glXMakeCurrent() failed without throwing an X error */
return SDL_SetError("Unable to make GL context current");
}
return 0;
}
/*
0 is a valid argument to glXSwapInterval(MESA|EXT) and setting it to 0
will undo the effect of a previous call with a value that is greater
than zero (or at least that is what the docs say). OTOH, 0 is an invalid
argument to glXSwapIntervalSGI and it returns an error if you call it
with 0 as an argument.
*/
static int swapinterval = 0;
int X11_GL_SetSwapInterval(_THIS, int interval)
{
int status = -1;
if ((interval < 0) && (!_this->gl_data->HAS_GLX_EXT_swap_control_tear)) {
SDL_SetError("Negative swap interval unsupported in this GL");
} else if (_this->gl_data->glXSwapIntervalEXT) {
Display *display = ((SDL_VideoData *)_this->driverdata)->display;
const SDL_WindowData *windowdata = (SDL_WindowData *)
SDL_GL_GetCurrentWindow()
->driverdata;
Window drawable = windowdata->xwindow;
/*
* This is a workaround for a bug in NVIDIA drivers. Bug has been reported
* and will be fixed in a future release (probably 319.xx).
*
* There's a bug where glXSetSwapIntervalEXT ignores updates because
* it has the wrong value cached. To work around it, we just run a no-op
* update to the current value.
*/
int currentInterval = X11_GL_GetSwapInterval(_this);
_this->gl_data->glXSwapIntervalEXT(display, drawable, currentInterval);
_this->gl_data->glXSwapIntervalEXT(display, drawable, interval);
status = 0;
swapinterval = interval;
} else if (_this->gl_data->glXSwapIntervalMESA) {
status = _this->gl_data->glXSwapIntervalMESA(interval);
if (status != 0) {
SDL_SetError("glXSwapIntervalMESA failed");
} else {
swapinterval = interval;
}
} else if (_this->gl_data->glXSwapIntervalSGI) {
status = _this->gl_data->glXSwapIntervalSGI(interval);
if (status != 0) {
SDL_SetError("glXSwapIntervalSGI failed");
} else {
swapinterval = interval;
}
} else {
SDL_Unsupported();
}
return status;
}
static SDL_GLSwapIntervalTearBehavior CheckSwapIntervalTearBehavior(SDL_VideoDevice *_this, Window drawable, unsigned int current_val, unsigned int current_allow_late)
{
/* Mesa and Nvidia interpret GLX_EXT_swap_control_tear differently, as of this writing, so
figure out which behavior we have.
Technical details: https://github.com/libsdl-org/SDL/issues/8004#issuecomment-1819603282 */
if (_this->gl_data->swap_interval_tear_behavior == SDL_SWAPINTERVALTEAR_UNTESTED) {
if (!_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
_this->gl_data->swap_interval_tear_behavior = SDL_SWAPINTERVALTEAR_UNKNOWN;
} else {
Display *display = ((SDL_VideoData *)_this->driverdata)->display;
unsigned int allow_late_swap_tearing = 22;
int original_val = (int) current_val;
/*
* This is a workaround for a bug in NVIDIA drivers. Bug has been reported
* and will be fixed in a future release (probably 319.xx).
*
* There's a bug where glXSetSwapIntervalEXT ignores updates because
* it has the wrong value cached. To work around it, we just run a no-op
* update to the current value.
*/
_this->gl_data->glXSwapIntervalEXT(display, drawable, current_val);
/* set it to no swap interval and see how it affects GLX_LATE_SWAPS_TEAR_EXT... */
_this->gl_data->glXSwapIntervalEXT(display, drawable, 0);
_this->gl_data->glXQueryDrawable(display, drawable, GLX_LATE_SWAPS_TEAR_EXT, &allow_late_swap_tearing);
if (allow_late_swap_tearing == 0) { /* GLX_LATE_SWAPS_TEAR_EXT says whether late swapping is currently in use */
_this->gl_data->swap_interval_tear_behavior = SDL_SWAPINTERVALTEAR_NVIDIA;
if (current_allow_late) {
original_val = -original_val;
}
} else if (allow_late_swap_tearing == 1) { /* GLX_LATE_SWAPS_TEAR_EXT says whether the Drawable can use late swapping at all */
_this->gl_data->swap_interval_tear_behavior = SDL_SWAPINTERVALTEAR_MESA;
} else { /* unexpected outcome! */
_this->gl_data->swap_interval_tear_behavior = SDL_SWAPINTERVALTEAR_UNKNOWN;
}
/* set us back to what it was originally... */
_this->gl_data->glXSwapIntervalEXT(display, drawable, original_val);
}
}
return _this->gl_data->swap_interval_tear_behavior;
}
int X11_GL_GetSwapInterval(_THIS)
{
if (_this->gl_data->glXSwapIntervalEXT) {
Display *display = ((SDL_VideoData *)_this->driverdata)->display;
const SDL_WindowData *windowdata = (SDL_WindowData *)
SDL_GL_GetCurrentWindow()
->driverdata;
Window drawable = windowdata->xwindow;
unsigned int allow_late_swap_tearing = 0;
unsigned int interval = 0;
if (_this->gl_data->HAS_GLX_EXT_swap_control_tear) {
allow_late_swap_tearing = 22; /* set this to nonsense. */
_this->gl_data->glXQueryDrawable(display, drawable,
GLX_LATE_SWAPS_TEAR_EXT,
&allow_late_swap_tearing);
}
_this->gl_data->glXQueryDrawable(display, drawable,
GLX_SWAP_INTERVAL_EXT, &interval);
switch (CheckSwapIntervalTearBehavior(_this, drawable, interval, allow_late_swap_tearing)) {
case SDL_SWAPINTERVALTEAR_MESA:
return (int)interval; /* unsigned int cast to signed that generates negative value if necessary. */
case SDL_SWAPINTERVALTEAR_NVIDIA:
default:
if ((allow_late_swap_tearing) && (interval > 0)) {
return -((int)interval);
}
return (int)interval;
}
return (int)interval; /* shouldn't hit this, but just in case. */
} else if (_this->gl_data->glXGetSwapIntervalMESA) {
return _this->gl_data->glXGetSwapIntervalMESA();
} else {