summaryrefslogtreecommitdiff
path: root/src/mesa/state_tracker/st_manager.c
blob: 179e5dc83926712dd7559e754af787e984cffa89 (plain)
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
/*
 * Mesa 3-D graphics library
 * Version:  7.9
 *
 * Copyright (C) 2010 LunarG Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Chia-I Wu <olv@lunarg.com>
 */

#include "state_tracker/st_gl_api.h"

#include "pipe/p_context.h"
#include "pipe/p_screen.h"
#include "util/u_format.h"
#include "util/u_pointer.h"
#include "util/u_inlines.h"
#include "util/u_atomic.h"
#include "util/u_surface.h"

#include "main/mtypes.h"
#include "main/context.h"
#include "main/mfeatures.h"
#include "main/texobj.h"
#include "main/teximage.h"
#include "main/texstate.h"
#include "main/framebuffer.h"
#include "main/fbobject.h"
#include "main/renderbuffer.h"
#include "main/version.h"
#include "st_texture.h"

#include "st_context.h"
#include "st_format.h"
#include "st_cb_fbo.h"
#include "st_cb_flush.h"
#include "st_manager.h"

/**
 * Cast wrapper to convert a struct gl_framebuffer to an st_framebuffer.
 * Return NULL if the struct gl_framebuffer is a user-created framebuffer.
 * We'll only return non-null for window system framebuffers.
 * Note that this function may fail.
 */
static INLINE struct st_framebuffer *
st_ws_framebuffer(struct gl_framebuffer *fb)
{
   /* FBO cannot be casted.  See st_new_framebuffer */
   return (struct st_framebuffer *) ((fb && !fb->Name) ? fb : NULL);
}

/**
 * Map an attachment to a buffer index.
 */
static INLINE gl_buffer_index
attachment_to_buffer_index(enum st_attachment_type statt)
{
   gl_buffer_index index;

   switch (statt) {
   case ST_ATTACHMENT_FRONT_LEFT:
      index = BUFFER_FRONT_LEFT;
      break;
   case ST_ATTACHMENT_BACK_LEFT:
      index = BUFFER_BACK_LEFT;
      break;
   case ST_ATTACHMENT_FRONT_RIGHT:
      index = BUFFER_FRONT_RIGHT;
      break;
   case ST_ATTACHMENT_BACK_RIGHT:
      index = BUFFER_BACK_RIGHT;
      break;
   case ST_ATTACHMENT_DEPTH_STENCIL:
      index = BUFFER_DEPTH;
      break;
   case ST_ATTACHMENT_ACCUM:
      index = BUFFER_ACCUM;
      break;
   case ST_ATTACHMENT_SAMPLE:
   default:
      index = BUFFER_COUNT;
      break;
   }

   return index;
}

/**
 * Map a buffer index to an attachment.
 */
static INLINE enum st_attachment_type
buffer_index_to_attachment(gl_buffer_index index)
{
   enum st_attachment_type statt;

   switch (index) {
   case BUFFER_FRONT_LEFT:
      statt = ST_ATTACHMENT_FRONT_LEFT;
      break;
   case BUFFER_BACK_LEFT:
      statt = ST_ATTACHMENT_BACK_LEFT;
      break;
   case BUFFER_FRONT_RIGHT:
      statt = ST_ATTACHMENT_FRONT_RIGHT;
      break;
   case BUFFER_BACK_RIGHT:
      statt = ST_ATTACHMENT_BACK_RIGHT;
      break;
   case BUFFER_DEPTH:
      statt = ST_ATTACHMENT_DEPTH_STENCIL;
      break;
   case BUFFER_ACCUM:
      statt = ST_ATTACHMENT_ACCUM;
      break;
   default:
      statt = ST_ATTACHMENT_INVALID;
      break;
   }

   return statt;
}

/**
 * Validate a framebuffer to make sure up-to-date pipe_textures are used.
 */
static void
st_framebuffer_validate(struct st_framebuffer *stfb, struct st_context *st)
{
   struct pipe_context *pipe = st->pipe;
   struct pipe_resource *textures[ST_ATTACHMENT_COUNT];
   uint width, height;
   unsigned i;
   boolean changed = FALSE;

   if (!p_atomic_read(&stfb->revalidate))
      return;

   /* validate the fb */
   if (!stfb->iface->validate(stfb->iface, stfb->statts, stfb->num_statts, textures))
      return;

   width = stfb->Base.Width;
   height = stfb->Base.Height;

   for (i = 0; i < stfb->num_statts; i++) {
      struct st_renderbuffer *strb;
      struct pipe_surface *ps, surf_tmpl;
      gl_buffer_index idx;

      if (!textures[i])
         continue;

      idx = attachment_to_buffer_index(stfb->statts[i]);
      if (idx >= BUFFER_COUNT) {
         pipe_resource_reference(&textures[i], NULL);
         continue;
      }

      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
      assert(strb);
      if (strb->texture == textures[i]) {
         pipe_resource_reference(&textures[i], NULL);
         continue;
      }

      memset(&surf_tmpl, 0, sizeof(surf_tmpl));
      u_surface_default_template(&surf_tmpl, textures[i],
                                 PIPE_BIND_RENDER_TARGET);
      ps = pipe->create_surface(pipe, textures[i], &surf_tmpl);
      if (ps) {
         pipe_surface_reference(&strb->surface, ps);
         pipe_resource_reference(&strb->texture, ps->texture);
         /* ownership transfered */
         pipe_surface_reference(&ps, NULL);

         changed = TRUE;

         strb->Base.Width = strb->surface->width;
         strb->Base.Height = strb->surface->height;

         width = strb->Base.Width;
         height = strb->Base.Height;
      }

      pipe_resource_reference(&textures[i], NULL);
   }

   if (changed) {
      st->dirty.st |= ST_NEW_FRAMEBUFFER;
      _mesa_resize_framebuffer(st->ctx, &stfb->Base, width, height);

      assert(stfb->Base.Width == width);
      assert(stfb->Base.Height == height);
   }

   p_atomic_set(&stfb->revalidate, FALSE);
}

/**
 * Update the attachments to validate by looping the existing renderbuffers.
 */
static void
st_framebuffer_update_attachments(struct st_framebuffer *stfb)
{
   gl_buffer_index idx;

   stfb->num_statts = 0;
   for (idx = 0; idx < BUFFER_COUNT; idx++) {
      struct st_renderbuffer *strb;
      enum st_attachment_type statt;

      strb = st_renderbuffer(stfb->Base.Attachment[idx].Renderbuffer);
      if (!strb || strb->software)
         continue;

      statt = buffer_index_to_attachment(idx);
      if (statt != ST_ATTACHMENT_INVALID &&
          st_visual_have_buffers(stfb->iface->visual, 1 << statt))
         stfb->statts[stfb->num_statts++] = statt;
   }

   p_atomic_set(&stfb->revalidate, TRUE);
}

/**
 * Add a renderbuffer to the framebuffer.
 */
static boolean
st_framebuffer_add_renderbuffer(struct st_framebuffer *stfb,
                                gl_buffer_index idx)
{
   struct gl_renderbuffer *rb;
   enum pipe_format format;
   int samples;
   boolean sw;

   if (!stfb->iface)
      return FALSE;

   /* do not distinguish depth/stencil buffers */
   if (idx == BUFFER_STENCIL)
      idx = BUFFER_DEPTH;

   switch (idx) {
   case BUFFER_DEPTH:
      format = stfb->iface->visual->depth_stencil_format;
      sw = FALSE;
      break;
   case BUFFER_ACCUM:
      format = stfb->iface->visual->accum_format;
      sw = TRUE;
      break;
   default:
      format = stfb->iface->visual->color_format;
      sw = FALSE;
      break;
   }

   if (format == PIPE_FORMAT_NONE)
      return FALSE;

   samples = stfb->iface->visual->samples;
   if (!samples)
      samples = st_get_msaa();

   rb = st_new_renderbuffer_fb(format, samples, sw);
   if (!rb)
      return FALSE;

   if (idx != BUFFER_DEPTH) {
      _mesa_add_renderbuffer(&stfb->Base, idx, rb);
   }
   else {
      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0))
         _mesa_add_renderbuffer(&stfb->Base, BUFFER_DEPTH, rb);
      if (util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1))
         _mesa_add_renderbuffer(&stfb->Base, BUFFER_STENCIL, rb);
   }

   return TRUE;
}

/**
 * Intialize a struct gl_config from a visual.
 */
static void
st_visual_to_context_mode(const struct st_visual *visual,
                          struct gl_config *mode)
{
   memset(mode, 0, sizeof(*mode));

   if (st_visual_have_buffers(visual, ST_ATTACHMENT_BACK_LEFT_MASK))
      mode->doubleBufferMode = GL_TRUE;
   if (st_visual_have_buffers(visual,
            ST_ATTACHMENT_FRONT_RIGHT_MASK | ST_ATTACHMENT_BACK_RIGHT_MASK))
      mode->stereoMode = GL_TRUE;

   if (visual->color_format != PIPE_FORMAT_NONE) {
      mode->rgbMode = GL_TRUE;

      mode->redBits =
         util_format_get_component_bits(visual->color_format,
               UTIL_FORMAT_COLORSPACE_RGB, 0);
      mode->greenBits =
         util_format_get_component_bits(visual->color_format,
               UTIL_FORMAT_COLORSPACE_RGB, 1);
      mode->blueBits =
         util_format_get_component_bits(visual->color_format,
               UTIL_FORMAT_COLORSPACE_RGB, 2);
      mode->alphaBits =
         util_format_get_component_bits(visual->color_format,
               UTIL_FORMAT_COLORSPACE_RGB, 3);

      mode->rgbBits = mode->redBits +
         mode->greenBits + mode->blueBits + mode->alphaBits;
   }

   if (visual->depth_stencil_format != PIPE_FORMAT_NONE) {
      mode->depthBits =
         util_format_get_component_bits(visual->depth_stencil_format,
               UTIL_FORMAT_COLORSPACE_ZS, 0);
      mode->stencilBits =
         util_format_get_component_bits(visual->depth_stencil_format,
               UTIL_FORMAT_COLORSPACE_ZS, 1);

      mode->haveDepthBuffer = mode->depthBits > 0;
      mode->haveStencilBuffer = mode->stencilBits > 0;
   }

   if (visual->accum_format != PIPE_FORMAT_NONE) {
      mode->haveAccumBuffer = GL_TRUE;

      mode->accumRedBits =
         util_format_get_component_bits(visual->accum_format,
               UTIL_FORMAT_COLORSPACE_RGB, 0);
      mode->accumGreenBits =
         util_format_get_component_bits(visual->accum_format,
               UTIL_FORMAT_COLORSPACE_RGB, 1);
      mode->accumBlueBits =
         util_format_get_component_bits(visual->accum_format,
               UTIL_FORMAT_COLORSPACE_RGB, 2);
      mode->accumAlphaBits =
         util_format_get_component_bits(visual->accum_format,
               UTIL_FORMAT_COLORSPACE_RGB, 3);
   }

   if (visual->samples) {
      mode->sampleBuffers = 1;
      mode->samples = visual->samples;
   }
}

/**
 * Determine the default draw or read buffer from a visual.
 */
static void
st_visual_to_default_buffer(const struct st_visual *visual,
                            GLenum *buffer, GLint *index)
{
   enum st_attachment_type statt;
   GLenum buf;
   gl_buffer_index idx;

   statt = visual->render_buffer;
   /* do nothing if an invalid render buffer is specified */
   if (statt == ST_ATTACHMENT_INVALID ||
       !st_visual_have_buffers(visual, 1 << statt))
      return;

   switch (statt) {
   case ST_ATTACHMENT_FRONT_LEFT:
      buf = GL_FRONT_LEFT;
      idx = BUFFER_FRONT_LEFT;
      break;
   case ST_ATTACHMENT_BACK_LEFT:
      buf = GL_BACK_LEFT;
      idx = BUFFER_BACK_LEFT;
      break;
   case ST_ATTACHMENT_FRONT_RIGHT:
      buf = GL_FRONT_RIGHT;
      idx = BUFFER_FRONT_RIGHT;
      break;
   case ST_ATTACHMENT_BACK_RIGHT:
      buf = GL_BACK_RIGHT;
      idx = BUFFER_BACK_RIGHT;
      break;
   default:
      buf = GL_NONE;
      idx = BUFFER_COUNT;
      break;
   }

   if (buf != GL_NONE) {
      if (buffer)
         *buffer = buf;
      if (index)
         *index = idx;
   }
}

/**
 * Create a framebuffer from a manager interface.
 */
static struct st_framebuffer *
st_framebuffer_create(struct st_framebuffer_iface *stfbi)
{
   struct st_framebuffer *stfb;
   struct gl_config mode;
   gl_buffer_index idx;

   stfb = CALLOC_STRUCT(st_framebuffer);
   if (!stfb)
      return NULL;

   /* for FBO-only context */
   if (!stfbi) {
      struct gl_framebuffer *base = _mesa_get_incomplete_framebuffer();

      stfb->Base = *base;

      return stfb;
   }

   st_visual_to_context_mode(stfbi->visual, &mode);
   _mesa_initialize_window_framebuffer(&stfb->Base, &mode);

   /* modify the draw/read buffers of the fb */
   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorDrawBuffer[0],
         &stfb->Base._ColorDrawBufferIndexes[0]);
   st_visual_to_default_buffer(stfbi->visual, &stfb->Base.ColorReadBuffer,
         &stfb->Base._ColorReadBufferIndex);

   stfb->iface = stfbi;

   /* add the color buffer */
   idx = stfb->Base._ColorDrawBufferIndexes[0];
   if (!st_framebuffer_add_renderbuffer(stfb, idx)) {
      FREE(stfb);
      return NULL;
   }

   st_framebuffer_add_renderbuffer(stfb, BUFFER_DEPTH);
   st_framebuffer_add_renderbuffer(stfb, BUFFER_ACCUM);

   st_framebuffer_update_attachments(stfb);

   stfb->Base.Initialized = GL_TRUE;

   return stfb;
}

/**
 * Reference a framebuffer.
 */
static void
st_framebuffer_reference(struct st_framebuffer **ptr,
                         struct st_framebuffer *stfb)
{
   struct gl_framebuffer *fb = &stfb->Base;
   _mesa_reference_framebuffer((struct gl_framebuffer **) ptr, fb);
}

static void
st_context_notify_invalid_framebuffer(struct st_context_iface *stctxi,
                                      struct st_framebuffer_iface *stfbi)
{
   struct st_context *st = (struct st_context *) stctxi;
   struct st_framebuffer *stfb;

   /* either draw or read winsys fb */
   stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
   if (!stfb || stfb->iface != stfbi)
      stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);

   if (stfb && stfb->iface == stfbi) {
      p_atomic_set(&stfb->revalidate, TRUE);
   }
   else {
      /* This function is probably getting called when we've detected a
       * change in a window's size but the currently bound context is
       * not bound to that window.
       * If the st_framebuffer_iface structure had a pointer to the
       * corresponding st_framebuffer we'd be able to handle this.
       */
   }
}

static void
st_context_flush(struct st_context_iface *stctxi, unsigned flags,
                 struct pipe_fence_handle **fence)
{
   struct st_context *st = (struct st_context *) stctxi;
   st_flush(st, flags, fence);
   if (flags & PIPE_FLUSH_RENDER_CACHE)
      st_manager_flush_frontbuffer(st);
}

static boolean
st_context_teximage(struct st_context_iface *stctxi,
                    enum st_texture_type target,
                    int level, enum pipe_format internal_format,
                    struct pipe_resource *tex, boolean mipmap)
{
   struct st_context *st = (struct st_context *) stctxi;
   struct gl_context *ctx = st->ctx;
   struct gl_texture_unit *texUnit = _mesa_get_current_tex_unit(ctx);
   struct gl_texture_object *texObj;
   struct gl_texture_image *texImage;
   struct st_texture_object *stObj;
   struct st_texture_image *stImage;
   GLenum internalFormat;
   GLuint width, height, depth;

   switch (target) {
   case ST_TEXTURE_1D:
      target = GL_TEXTURE_1D;
      break;
   case ST_TEXTURE_2D:
      target = GL_TEXTURE_2D;
      break;
   case ST_TEXTURE_3D:
      target = GL_TEXTURE_3D;
      break;
   case ST_TEXTURE_RECT:
      target = GL_TEXTURE_RECTANGLE_ARB;
      break;
   default:
      return FALSE;
      break;
   }

   texObj = _mesa_select_tex_object(ctx, texUnit, target);
   _mesa_lock_texture(ctx, texObj);

   stObj = st_texture_object(texObj);
   /* switch to surface based */
   if (!stObj->surface_based) {
      _mesa_clear_texture_object(ctx, texObj);
      stObj->surface_based = GL_TRUE;
   }

   texImage = _mesa_get_tex_image(ctx, texObj, target, level);
   stImage = st_texture_image(texImage);
   if (tex) {
      gl_format texFormat;

      /*
       * XXX When internal_format and tex->format differ, st_finalize_texture
       * needs to allocate a new texture with internal_format and copy the
       * texture here into the new one.  It will result in surface_copy being
       * called on surfaces whose formats differ.
       *
       * To avoid that, internal_format is (wrongly) ignored here.  A sane fix
       * is to use a sampler view.
       */
      if (!st_sampler_compat_formats(tex->format, internal_format))
	 internal_format = tex->format;
     
      if (util_format_get_component_bits(internal_format,
               UTIL_FORMAT_COLORSPACE_RGB, 3) > 0)
         internalFormat = GL_RGBA;
      else
         internalFormat = GL_RGB;

      texFormat = st_ChooseTextureFormat(ctx, internalFormat,
                                         GL_RGBA, GL_UNSIGNED_BYTE);

      _mesa_init_teximage_fields(ctx, target, texImage,
                                 tex->width0, tex->height0, 1, 0,
                                 internalFormat, texFormat);

      width = tex->width0;
      height = tex->height0;
      depth = tex->depth0;

      /* grow the image size until we hit level = 0 */
      while (level > 0) {
         if (width != 1)
            width <<= 1;
         if (height != 1)
            height <<= 1;
         if (depth != 1)
            depth <<= 1;
         level--;
      }
   }
   else {
      _mesa_clear_texture_image(ctx, texImage);
      width = height = depth = 0;
   }

   pipe_resource_reference(&stImage->pt, tex);
   stObj->width0 = width;
   stObj->height0 = height;
   stObj->depth0 = depth;

   _mesa_dirty_texobj(ctx, texObj, GL_TRUE);
   _mesa_unlock_texture(ctx, texObj);
   
   return TRUE;
}

static void
st_context_copy(struct st_context_iface *stctxi,
                struct st_context_iface *stsrci, unsigned mask)
{
   struct st_context *st = (struct st_context *) stctxi;
   struct st_context *src = (struct st_context *) stsrci;

   _mesa_copy_context(src->ctx, st->ctx, mask);
}

static boolean
st_context_share(struct st_context_iface *stctxi,
                 struct st_context_iface *stsrci)
{
   struct st_context *st = (struct st_context *) stctxi;
   struct st_context *src = (struct st_context *) stsrci;

   return _mesa_share_state(st->ctx, src->ctx);
}

static void
st_context_destroy(struct st_context_iface *stctxi)
{
   struct st_context *st = (struct st_context *) stctxi;
   st_destroy_context(st);
}

static struct st_context_iface *
st_api_create_context(struct st_api *stapi, struct st_manager *smapi,
                      const struct st_context_attribs *attribs,
                      struct st_context_iface *shared_stctxi)
{
   struct st_context *shared_ctx = (struct st_context *) shared_stctxi;
   struct st_context *st;
   struct pipe_context *pipe;
   struct gl_config mode;
   gl_api api;

   if (!(stapi->profile_mask & (1 << attribs->profile)))
      return NULL;

   switch (attribs->profile) {
   case ST_PROFILE_DEFAULT:
      api = API_OPENGL;
      break;
   case ST_PROFILE_OPENGL_ES1:
      api = API_OPENGLES;
      break;
   case ST_PROFILE_OPENGL_ES2:
      api = API_OPENGLES2;
      break;
   case ST_PROFILE_OPENGL_CORE:
   default:
      return NULL;
      break;
   }

   pipe = smapi->screen->context_create(smapi->screen, NULL);
   if (!pipe)
      return NULL;

   st_visual_to_context_mode(&attribs->visual, &mode);
   st = st_create_context(api, pipe, &mode, shared_ctx);
   if (!st) {
      pipe->destroy(pipe);
      return NULL;
   }

   /* need to perform version check */
   if (attribs->major > 1 || attribs->minor > 0) {
      _mesa_compute_version(st->ctx);

      if (st->ctx->VersionMajor < attribs->major ||
          st->ctx->VersionMajor < attribs->minor) {
         st_destroy_context(st);
         return NULL;
      }
   }

   st->invalidate_on_gl_viewport =
      smapi->get_param(smapi, ST_MANAGER_BROKEN_INVALIDATE);

   st->iface.destroy = st_context_destroy;
   st->iface.notify_invalid_framebuffer =
      st_context_notify_invalid_framebuffer;
   st->iface.flush = st_context_flush;
   st->iface.teximage = st_context_teximage;
   st->iface.copy = st_context_copy;
   st->iface.share = st_context_share;
   st->iface.st_context_private = (void *) smapi;

   return &st->iface;
}

static boolean
st_api_make_current(struct st_api *stapi, struct st_context_iface *stctxi,
                    struct st_framebuffer_iface *stdrawi,
                    struct st_framebuffer_iface *streadi)
{
   struct st_context *st = (struct st_context *) stctxi;
   struct st_framebuffer *stdraw, *stread, *stfb;
   boolean ret;

   _glapi_check_multithread();

   if (st) {
      /* reuse/create the draw fb */
      stfb = st_ws_framebuffer(st->ctx->WinSysDrawBuffer);
      if (stfb && stfb->iface == stdrawi) {
         stdraw = NULL;
         st_framebuffer_reference(&stdraw, stfb);
      }
      else {
         stdraw = st_framebuffer_create(stdrawi);
      }

      /* reuse/create the read fb */
      stfb = st_ws_framebuffer(st->ctx->WinSysReadBuffer);
      if (!stfb || stfb->iface != streadi)
         stfb = stdraw;
      if (stfb && stfb->iface == streadi) {
         stread = NULL;
         st_framebuffer_reference(&stread, stfb);
      }
      else {
         stread = st_framebuffer_create(streadi);
      }

      if (stdraw && stread) {
         st_framebuffer_validate(stdraw, st);
         if (stread != stdraw)
            st_framebuffer_validate(stread, st);

         /* modify the draw/read buffers of the context */
         if (stdraw->iface) {
            st_visual_to_default_buffer(stdraw->iface->visual,
                  &st->ctx->Color.DrawBuffer[0], NULL);
         }
         if (stread->iface) {
            st_visual_to_default_buffer(stread->iface->visual,
                  &st->ctx->Pixel.ReadBuffer, NULL);
         }

         ret = _mesa_make_current(st->ctx, &stdraw->Base, &stread->Base);
      }
      else {
         ret = FALSE;
      }

      st_framebuffer_reference(&stdraw, NULL);
      st_framebuffer_reference(&stread, NULL);
   }
   else {
      ret = _mesa_make_current(NULL, NULL, NULL);
   }

   return ret;
}

static struct st_context_iface *
st_api_get_current(struct st_api *stapi)
{
   GET_CURRENT_CONTEXT(ctx);
   struct st_context *st = (ctx) ? ctx->st : NULL;

   return (st) ? &st->iface : NULL;
}

static st_proc_t
st_api_get_proc_address(struct st_api *stapi, const char *procname)
{
   return (st_proc_t) _glapi_get_proc_address(procname);
}

static void
st_api_destroy(struct st_api *stapi)
{
}

/**
 * Flush the front buffer if the current context renders to the front buffer.
 */
void
st_manager_flush_frontbuffer(struct st_context *st)
{
   struct st_framebuffer *stfb = st_ws_framebuffer(st->ctx->DrawBuffer);
   struct st_renderbuffer *strb = NULL;

   if (stfb)
      strb = st_renderbuffer(stfb->Base.Attachment[BUFFER_FRONT_LEFT].Renderbuffer);
   if (!strb)
      return;

   /* never a dummy fb */
   assert(stfb->iface);
   stfb->iface->flush_front(stfb->iface, ST_ATTACHMENT_FRONT_LEFT);
}

/**
 * Return the surface of an EGLImage.
 * FIXME: I think this should operate on resources, not surfaces
 */
struct pipe_surface *
st_manager_get_egl_image_surface(struct st_context *st,
                                 void *eglimg, unsigned usage)
{
   struct st_manager *smapi =
      (struct st_manager *) st->iface.st_context_private;
   struct st_egl_image stimg;
   struct pipe_surface *ps, surf_tmpl;

   if (!smapi || !smapi->get_egl_image)
      return NULL;

   memset(&stimg, 0, sizeof(stimg));
   if (!smapi->get_egl_image(smapi, eglimg, &stimg))
      return NULL;

   memset(&surf_tmpl, 0, sizeof(surf_tmpl));
   surf_tmpl.format = stimg.texture->format;
   surf_tmpl.usage = usage;
   surf_tmpl.u.tex.level = stimg.level;
   surf_tmpl.u.tex.first_layer = stimg.layer;
   surf_tmpl.u.tex.last_layer = stimg.layer;
   ps = st->pipe->create_surface(st->pipe, stimg.texture, &surf_tmpl);
   pipe_resource_reference(&stimg.texture, NULL);

   return ps;
}

/**
 * Re-validate the framebuffers.
 */
void
st_manager_validate_framebuffers(struct st_context *st)
{
   struct st_framebuffer *stdraw = st_ws_framebuffer(st->ctx->DrawBuffer);
   struct st_framebuffer *stread = st_ws_framebuffer(st->ctx->ReadBuffer);

   if (stdraw)
      st_framebuffer_validate(stdraw, st);
   if (stread && stread != stdraw)
      st_framebuffer_validate(stread, st);
}

/**
 * Add a color renderbuffer on demand.
 */
boolean
st_manager_add_color_renderbuffer(struct st_context *st,
                                  struct gl_framebuffer *fb,
                                  gl_buffer_index idx)
{
   struct st_framebuffer *stfb = st_ws_framebuffer(fb);

   /* FBO */
   if (!stfb)
      return FALSE;

   if (stfb->Base.Attachment[idx].Renderbuffer)
      return TRUE;

   switch (idx) {
   case BUFFER_FRONT_LEFT:
   case BUFFER_BACK_LEFT:
   case BUFFER_FRONT_RIGHT:
   case BUFFER_BACK_RIGHT:
      break;
   default:
      return FALSE;
      break;
   }

   if (!st_framebuffer_add_renderbuffer(stfb, idx))
      return FALSE;

   st_framebuffer_update_attachments(stfb);
   st_invalidate_state(st->ctx, _NEW_BUFFERS);

   return TRUE;
}

static const struct st_api st_gl_api = {
   "Mesa " MESA_VERSION_STRING,
   ST_API_OPENGL,
#if FEATURE_GL
   ST_PROFILE_DEFAULT_MASK |
#endif
#if FEATURE_ES1
   ST_PROFILE_OPENGL_ES1_MASK |
#endif
#if FEATURE_ES2
   ST_PROFILE_OPENGL_ES2_MASK |
#endif
   0,
   st_api_destroy,
   st_api_get_proc_address,
   st_api_create_context,
   st_api_make_current,
   st_api_get_current,
};

struct st_api *
st_gl_api_create(void)
{
   return (struct st_api *) &st_gl_api;
}