aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/mesa/state_tracker/st_cb_fbo.c
blob: 01aba8eaff1d723f4db4e14f7c1cee25727efc13 (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
/**************************************************************************
 * 
 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * 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, sub license, 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 (including the
 * next paragraph) 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 NON-INFRINGEMENT.
 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS 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.
 * 
 **************************************************************************/


/**
 * Framebuffer/renderbuffer functions.
 *
 * \author Brian Paul
 */


#include "main/imports.h"
#include "main/context.h"
#include "main/fbobject.h"
#include "main/framebuffer.h"
#include "main/macros.h"
#include "main/mfeatures.h"
#include "main/renderbuffer.h"

#include "pipe/p_context.h"
#include "pipe/p_defines.h"
#include "pipe/p_screen.h"
#include "st_context.h"
#include "st_cb_fbo.h"
#include "st_cb_flush.h"
#include "st_cb_texture.h"
#include "st_format.h"
#include "st_texture.h"
#include "st_manager.h"

#include "util/u_format.h"
#include "util/u_inlines.h"
#include "util/u_surface.h"


static GLboolean
st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
                                 struct gl_renderbuffer *rb,
                                 GLenum internalFormat,
                                 GLuint width, GLuint height)
{
   struct pipe_screen *screen = st_context(ctx)->pipe->screen;
   struct st_renderbuffer *strb = st_renderbuffer(rb);
   enum pipe_format format;
   size_t size;

   free(strb->data);
   strb->data = NULL;

   if (internalFormat == GL_RGBA16_SNORM) {
      /* Special case for software accum buffers.  Otherwise, if the
       * call to st_choose_renderbuffer_format() fails (because the
       * driver doesn't support signed 16-bit/channel colors) we'd
       * just return without allocating the software accum buffer.
       */
      format = PIPE_FORMAT_R16G16B16A16_SNORM;
   }
   else {
      format = st_choose_renderbuffer_format(screen, internalFormat, 0);

      /* Not setting gl_renderbuffer::Format here will cause
       * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
       */
      if (format == PIPE_FORMAT_NONE) {
         return GL_TRUE;
      }
   }

   strb->Base.Format = st_pipe_format_to_mesa_format(format);

   size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
   strb->data = malloc(size);
   return strb->data != NULL;
}


/**
 * gl_renderbuffer::AllocStorage()
 * This is called to allocate the original drawing surface, and
 * during window resize.
 */
static GLboolean
st_renderbuffer_alloc_storage(struct gl_context * ctx,
                              struct gl_renderbuffer *rb,
                              GLenum internalFormat,
                              GLuint width, GLuint height)
{
   struct st_context *st = st_context(ctx);
   struct pipe_context *pipe = st->pipe;
   struct pipe_screen *screen = st->pipe->screen;
   struct st_renderbuffer *strb = st_renderbuffer(rb);
   enum pipe_format format = PIPE_FORMAT_NONE;
   struct pipe_surface surf_tmpl;
   struct pipe_resource templ;

   /* init renderbuffer fields */
   strb->Base.Width  = width;
   strb->Base.Height = height;
   strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
   strb->defined = GL_FALSE;  /* undefined contents now */

   if (strb->software) {
      return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
                                              width, height);
   }

   /* Free the old surface and texture
    */
   pipe_surface_reference( &strb->surface, NULL );
   pipe_resource_reference( &strb->texture, NULL );

   /* Handle multisample renderbuffers first.
    *
    * From ARB_framebuffer_object:
    *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
    *   Otherwise <samples> represents a request for a desired minimum
    *   number of samples. Since different implementations may support
    *   different sample counts for multisampled rendering, the actual
    *   number of samples allocated for the renderbuffer image is
    *   implementation dependent.  However, the resulting value for
    *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
    *   to <samples> and no more than the next larger sample count supported
    *   by the implementation.
    *
    * So let's find the supported number of samples closest to NumSamples.
    * (NumSamples == 1) is treated the same as (NumSamples == 0).
    */
   if (rb->NumSamples > 1) {
      unsigned i;

      for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
         format = st_choose_renderbuffer_format(screen, internalFormat, i);

         if (format != PIPE_FORMAT_NONE) {
            rb->NumSamples = i;
            break;
         }
      }
   } else {
      format = st_choose_renderbuffer_format(screen, internalFormat, 0);
   }

   /* Not setting gl_renderbuffer::Format here will cause
    * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
    */
   if (format == PIPE_FORMAT_NONE) {
      return GL_TRUE;
   }

   strb->Base.Format = st_pipe_format_to_mesa_format(format);

   if (width == 0 || height == 0) {
      /* if size is zero, nothing to allocate */
      return GL_TRUE;
   }

   /* Setup new texture template.
    */
   memset(&templ, 0, sizeof(templ));
   templ.target = st->internal_target;
   templ.format = format;
   templ.width0 = width;
   templ.height0 = height;
   templ.depth0 = 1;
   templ.array_size = 1;
   templ.nr_samples = rb->NumSamples;
   if (util_format_is_depth_or_stencil(format)) {
      templ.bind = PIPE_BIND_DEPTH_STENCIL;
   }
   else if (strb->Base.Name != 0) {
      /* this is a user-created renderbuffer */
      templ.bind = PIPE_BIND_RENDER_TARGET;
   }
   else {
      /* this is a window-system buffer */
      templ.bind = (PIPE_BIND_DISPLAY_TARGET |
                    PIPE_BIND_RENDER_TARGET);
   }

   strb->texture = screen->resource_create(screen, &templ);

   if (!strb->texture)
      return FALSE;

   u_surface_default_template(&surf_tmpl, strb->texture, templ.bind);
   strb->surface = pipe->create_surface(pipe,
                                        strb->texture,
                                        &surf_tmpl);
   if (strb->surface) {
      assert(strb->surface->texture);
      assert(strb->surface->format);
      assert(strb->surface->width == width);
      assert(strb->surface->height == height);
   }

   return strb->surface != NULL;
}


/**
 * gl_renderbuffer::Delete()
 */
static void
st_renderbuffer_delete(struct gl_renderbuffer *rb)
{
   struct st_renderbuffer *strb = st_renderbuffer(rb);
   ASSERT(strb);
   pipe_surface_reference(&strb->surface, NULL);
   pipe_resource_reference(&strb->texture, NULL);
   free(strb->data);
   _mesa_delete_renderbuffer(rb);
}


/**
 * Called via ctx->Driver.NewFramebuffer()
 */
static struct gl_framebuffer *
st_new_framebuffer(struct gl_context *ctx, GLuint name)
{
   /* XXX not sure we need to subclass gl_framebuffer for pipe */
   return _mesa_new_framebuffer(ctx, name);
}


/**
 * Called via ctx->Driver.NewRenderbuffer()
 */
static struct gl_renderbuffer *
st_new_renderbuffer(struct gl_context *ctx, GLuint name)
{
   struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
   if (strb) {
      assert(name != 0);
      _mesa_init_renderbuffer(&strb->Base, name);
      strb->Base.Delete = st_renderbuffer_delete;
      strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
      return &strb->Base;
   }
   return NULL;
}


/**
 * Allocate a renderbuffer for a an on-screen window (not a user-created
 * renderbuffer).  The window system code determines the format.
 */
struct gl_renderbuffer *
st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
{
   struct st_renderbuffer *strb;

   strb = ST_CALLOC_STRUCT(st_renderbuffer);
   if (!strb) {
      _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
      return NULL;
   }

   _mesa_init_renderbuffer(&strb->Base, 0);
   strb->Base.ClassID = 0x4242; /* just a unique value */
   strb->Base.NumSamples = samples;
   strb->Base.Format = st_pipe_format_to_mesa_format(format);
   strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
   strb->software = sw;
   
   switch (format) {
   case PIPE_FORMAT_R8G8B8A8_UNORM:
   case PIPE_FORMAT_B8G8R8A8_UNORM:
   case PIPE_FORMAT_A8R8G8B8_UNORM:
      strb->Base.InternalFormat = GL_RGBA8;
      break;
   case PIPE_FORMAT_R8G8B8X8_UNORM:
   case PIPE_FORMAT_B8G8R8X8_UNORM:
   case PIPE_FORMAT_X8R8G8B8_UNORM:
      strb->Base.InternalFormat = GL_RGB8;
      break;
   case PIPE_FORMAT_B5G5R5A1_UNORM:
      strb->Base.InternalFormat = GL_RGB5_A1;
      break;
   case PIPE_FORMAT_B4G4R4A4_UNORM:
      strb->Base.InternalFormat = GL_RGBA4;
      break;
   case PIPE_FORMAT_B5G6R5_UNORM:
      strb->Base.InternalFormat = GL_RGB565;
      break;
   case PIPE_FORMAT_Z16_UNORM:
      strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
      break;
   case PIPE_FORMAT_Z32_UNORM:
      strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
      break;
   case PIPE_FORMAT_Z24_UNORM_S8_UINT:
   case PIPE_FORMAT_S8_UINT_Z24_UNORM:
   case PIPE_FORMAT_Z24X8_UNORM:
   case PIPE_FORMAT_X8Z24_UNORM:
      strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
      break;
   case PIPE_FORMAT_S8_UINT:
      strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
      break;
   case PIPE_FORMAT_R16G16B16A16_SNORM:
      /* accum buffer */
      strb->Base.InternalFormat = GL_RGBA16_SNORM;
      break;
   case PIPE_FORMAT_R8_UNORM:
      strb->Base.InternalFormat = GL_R8;
      break;
   case PIPE_FORMAT_R8G8_UNORM:
      strb->Base.InternalFormat = GL_RG8;
      break;
   case PIPE_FORMAT_R16_UNORM:
      strb->Base.InternalFormat = GL_R16;
      break;
   case PIPE_FORMAT_R16G16_UNORM:
      strb->Base.InternalFormat = GL_RG16;
      break;
   case PIPE_FORMAT_R32G32B32A32_FLOAT:
      strb->Base.InternalFormat = GL_RGBA32F;
      break;
   case PIPE_FORMAT_R16G16B16A16_FLOAT:
      strb->Base.InternalFormat = GL_RGBA16F;
      break;
   default:
      _mesa_problem(NULL,
		    "Unexpected format %s in st_new_renderbuffer_fb",
                    util_format_name(format));
      free(strb);
      return NULL;
   }

   /* st-specific methods */
   strb->Base.Delete = st_renderbuffer_delete;
   strb->Base.AllocStorage = st_renderbuffer_alloc_storage;

   /* surface is allocated in st_renderbuffer_alloc_storage() */
   strb->surface = NULL;

   return &strb->Base;
}


/**
 * Called via ctx->Driver.BindFramebufferEXT().
 */
static void
st_bind_framebuffer(struct gl_context *ctx, GLenum target,
                    struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
{
   /* no-op */
}


/**
 * Called by ctx->Driver.RenderTexture
 */
static void
st_render_texture(struct gl_context *ctx,
                  struct gl_framebuffer *fb,
                  struct gl_renderbuffer_attachment *att)
{
   struct st_context *st = st_context(ctx);
   struct pipe_context *pipe = st->pipe;
   struct st_renderbuffer *strb;
   struct gl_renderbuffer *rb;
   struct pipe_resource *pt;
   struct st_texture_object *stObj;
   const struct gl_texture_image *texImage;
   struct pipe_surface surf_tmpl;

   if (!st_finalize_texture(ctx, pipe, att->Texture))
      return;

   pt = st_get_texobj_resource(att->Texture);
   assert(pt);

   /* get pointer to texture image we're rendeing to */
   texImage = _mesa_get_attachment_teximage(att);

   /* create new renderbuffer which wraps the texture image.
    * Use the texture's name as the renderbuffer's name so that we have
    * something that's non-zero (to determine vertical orientation) and
    * possibly helpful for debugging.
    */
   rb = st_new_renderbuffer(ctx, att->Texture->Name);
   if (!rb) {
      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glFramebufferTexture()");
      return;
   }

   _mesa_reference_renderbuffer(&att->Renderbuffer, rb);
   assert(rb->RefCount == 1);
   rb->AllocStorage = NULL; /* should not get called */
   strb = st_renderbuffer(rb);

   assert(strb->Base.RefCount > 0);

   /* get the texture for the texture object */
   stObj = st_texture_object(att->Texture);

   /* point renderbuffer at texobject */
   strb->rtt = stObj;
   strb->rtt_level = att->TextureLevel;
   strb->rtt_face = att->CubeMapFace;
   strb->rtt_slice = att->Zoffset;

   rb->Width = texImage->Width2;
   rb->Height = texImage->Height2;
   rb->_BaseFormat = texImage->_BaseFormat;
   rb->InternalFormat = texImage->InternalFormat;

   pipe_resource_reference( &strb->texture, pt );

   pipe_surface_reference(&strb->surface, NULL);

   assert(strb->rtt_level <= strb->texture->last_level);

   /* new surface for rendering into the texture */
   memset(&surf_tmpl, 0, sizeof(surf_tmpl));
   surf_tmpl.format = ctx->Color.sRGBEnabled
      ? strb->texture->format : util_format_linear(strb->texture->format);
   surf_tmpl.usage = PIPE_BIND_RENDER_TARGET;
   surf_tmpl.u.tex.level = strb->rtt_level;
   surf_tmpl.u.tex.first_layer = strb->rtt_face + strb->rtt_slice;
   surf_tmpl.u.tex.last_layer = strb->rtt_face + strb->rtt_slice;
   strb->surface = pipe->create_surface(pipe,
                                        strb->texture,
                                        &surf_tmpl);

   strb->Base.Format = st_pipe_format_to_mesa_format(pt->format);

   /* Invalidate buffer state so that the pipe's framebuffer state
    * gets updated.
    * That's where the new renderbuffer (which we just created) gets
    * passed to the pipe as a (color/depth) render target.
    */
   st_invalidate_state(ctx, _NEW_BUFFERS);


   /* Need to trigger a call to update_framebuffer() since we just
    * attached a new renderbuffer.
    */
   ctx->NewState |= _NEW_BUFFERS;
}


/**
 * Called via ctx->Driver.FinishRenderTexture.
 */
static void
st_finish_render_texture(struct gl_context *ctx,
                         struct gl_renderbuffer_attachment *att)
{
   struct st_renderbuffer *strb = st_renderbuffer(att->Renderbuffer);

   if (!strb)
      return;

   strb->rtt = NULL;

   /* restore previous framebuffer state */
   st_invalidate_state(ctx, _NEW_BUFFERS);
}


/** Debug helper */
static void
st_fbo_invalid(const char *reason)
{
   if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
      _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
   }
}


/**
 * Validate a renderbuffer attachment for a particular set of bindings.
 */
static GLboolean
st_validate_attachment(struct gl_context *ctx,
		       struct pipe_screen *screen,
		       const struct gl_renderbuffer_attachment *att,
		       unsigned bindings)
{
   const struct st_texture_object *stObj = st_texture_object(att->Texture);
   enum pipe_format format;
   gl_format texFormat;
   GLboolean valid;

   /* Only validate texture attachments for now, since
    * st_renderbuffer_alloc_storage makes sure that
    * the format is supported.
    */
   if (att->Type != GL_TEXTURE)
      return GL_TRUE;

   if (!stObj)
      return GL_FALSE;

   format = stObj->pt->format;
   texFormat = _mesa_get_attachment_teximage_const(att)->TexFormat;

   /* If the encoding is sRGB and sRGB rendering cannot be enabled,
    * check for linear format support instead.
    * Later when we create a surface, we change the format to a linear one. */
   if (!ctx->Extensions.EXT_framebuffer_sRGB &&
       _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
      const gl_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
      format = st_mesa_format_to_pipe_format(linearFormat);
   }

   valid = screen->is_format_supported(screen, format,
                                      PIPE_TEXTURE_2D,
                                      stObj->pt->nr_samples, bindings);
   if (!valid) {
      st_fbo_invalid("Invalid format");
   }

   return valid;
}


/**
 * Check if two renderbuffer attachments name a combined depth/stencil
 * renderbuffer.
 */
GLboolean
st_is_depth_stencil_combined(const struct gl_renderbuffer_attachment *depth,
                             const struct gl_renderbuffer_attachment *stencil)
{
   assert(depth && stencil);

   if (depth->Type == stencil->Type) {
      if (depth->Type == GL_RENDERBUFFER_EXT &&
          depth->Renderbuffer == stencil->Renderbuffer)
         return GL_TRUE;

      if (depth->Type == GL_TEXTURE &&
          depth->Texture == stencil->Texture)
         return GL_TRUE;
   }

   return GL_FALSE;
}
 

/**
 * Check that the framebuffer configuration is valid in terms of what
 * the driver can support.
 *
 * For Gallium we only supports combined Z+stencil, not separate buffers.
 */
static void
st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
{
   struct st_context *st = st_context(ctx);
   struct pipe_screen *screen = st->pipe->screen;
   const struct gl_renderbuffer_attachment *depth =
         &fb->Attachment[BUFFER_DEPTH];
   const struct gl_renderbuffer_attachment *stencil =
         &fb->Attachment[BUFFER_STENCIL];
   GLuint i;
   enum pipe_format first_format = PIPE_FORMAT_NONE;
   boolean mixed_formats =
         screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;

   if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
      st_fbo_invalid("Different Depth/Stencil buffer formats");
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   if (depth->Type == GL_RENDERBUFFER_EXT &&
       stencil->Type == GL_RENDERBUFFER_EXT &&
       depth->Renderbuffer != stencil->Renderbuffer) {
      st_fbo_invalid("Separate Depth/Stencil buffers");
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   if (depth->Type == GL_TEXTURE &&
       stencil->Type == GL_TEXTURE &&
       depth->Texture != stencil->Texture) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      st_fbo_invalid("Different Depth/Stencil textures");
      return;
   }

   if (!st_validate_attachment(ctx,
                               screen,
                               depth,
			       PIPE_BIND_DEPTH_STENCIL)) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   if (!st_validate_attachment(ctx,
                               screen,
                               stencil,
			       PIPE_BIND_DEPTH_STENCIL)) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
      struct gl_renderbuffer_attachment *att =
            &fb->Attachment[BUFFER_COLOR0 + i];
      enum pipe_format format;

      if (!st_validate_attachment(ctx,
                                  screen,
				  att,
				  PIPE_BIND_RENDER_TARGET)) {
	 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
	 return;
      }

      if (!mixed_formats) {
         /* Disallow mixed formats. */
         if (att->Type != GL_NONE) {
            format = st_renderbuffer(att->Renderbuffer)->surface->format;
         } else {
            continue;
         }

         if (first_format == PIPE_FORMAT_NONE) {
            first_format = format;
         } else if (format != first_format) {
            fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
            st_fbo_invalid("Mixed color formats");
            return;
         }
      }
   }
}


/**
 * Called via glDrawBuffer.
 */
static void
st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
{
   struct st_context *st = st_context(ctx);
   struct gl_framebuffer *fb = ctx->DrawBuffer;
   GLuint i;

   (void) count;
   (void) buffers;

   /* add the renderbuffers on demand */
   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
      gl_buffer_index idx = fb->_ColorDrawBufferIndexes[i];
      st_manager_add_color_renderbuffer(st, fb, idx);
   }
}


/**
 * Called via glReadBuffer.
 */
static void
st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
{
   struct st_context *st = st_context(ctx);
   struct gl_framebuffer *fb = ctx->ReadBuffer;

   (void) buffer;

   /* add the renderbuffer on demand */
   st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
}



/**
 * Called via ctx->Driver.MapRenderbuffer.
 */
static void
st_MapRenderbuffer(struct gl_context *ctx,
                   struct gl_renderbuffer *rb,
                   GLuint x, GLuint y, GLuint w, GLuint h,
                   GLbitfield mode,
                   GLubyte **mapOut, GLint *rowStrideOut)
{
   struct st_context *st = st_context(ctx);
   struct st_renderbuffer *strb = st_renderbuffer(rb);
   struct pipe_context *pipe = st->pipe;
   const GLboolean invert = rb->Name == 0;
   unsigned usage;
   GLuint y2;

   if (strb->software) {
      /* software-allocated renderbuffer (probably an accum buffer) */
      if (strb->data) {
         GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
         GLint stride = _mesa_format_row_stride(strb->Base.Format,
                                                strb->Base.Width);
         *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
         *rowStrideOut = stride;
      }
      else {
         *mapOut = NULL;
         *rowStrideOut = 0;
      }
      return;
   }

   usage = 0x0;
   if (mode & GL_MAP_READ_BIT)
      usage |= PIPE_TRANSFER_READ;
   if (mode & GL_MAP_WRITE_BIT)
      usage |= PIPE_TRANSFER_WRITE;
   if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
      usage |= PIPE_TRANSFER_DISCARD_RANGE;

   /* Note: y=0=bottom of buffer while y2=0=top of buffer.
    * 'invert' will be true for window-system buffers and false for
    * user-allocated renderbuffers and textures.
    */
   if (invert)
      y2 = strb->Base.Height - y - h;
   else
      y2 = y;

   strb->transfer = pipe_get_transfer(pipe,
                                      strb->texture,
                                      strb->rtt_level,
                                      strb->rtt_face + strb->rtt_slice,
                                      usage, x, y2, w, h);
   if (strb->transfer) {
      GLubyte *map = pipe_transfer_map(pipe, strb->transfer);
      if (invert) {
         *rowStrideOut = -strb->transfer->stride;
         map += (h - 1) * strb->transfer->stride;
      }
      else {
         *rowStrideOut = strb->transfer->stride;
      }
      *mapOut = map;
   }
   else {
      *mapOut = NULL;
      *rowStrideOut = 0;
   }
}


/**
 * Called via ctx->Driver.UnmapRenderbuffer.
 */
static void
st_UnmapRenderbuffer(struct gl_context *ctx,
                     struct gl_renderbuffer *rb)
{
   struct st_context *st = st_context(ctx);
   struct st_renderbuffer *strb = st_renderbuffer(rb);
   struct pipe_context *pipe = st->pipe;

   if (strb->software) {
      /* software-allocated renderbuffer (probably an accum buffer) */
      return;
   }

   pipe_transfer_unmap(pipe, strb->transfer);
   pipe->transfer_destroy(pipe, strb->transfer);
   strb->transfer = NULL;
}



void st_init_fbo_functions(struct dd_function_table *functions)
{
#if FEATURE_EXT_framebuffer_object
   functions->NewFramebuffer = st_new_framebuffer;
   functions->NewRenderbuffer = st_new_renderbuffer;
   functions->BindFramebuffer = st_bind_framebuffer;
   functions->FramebufferRenderbuffer = _mesa_framebuffer_renderbuffer;
   functions->RenderTexture = st_render_texture;
   functions->FinishRenderTexture = st_finish_render_texture;
   functions->ValidateFramebuffer = st_validate_framebuffer;
#endif

   functions->DrawBuffers = st_DrawBuffers;
   functions->ReadBuffer = st_ReadBuffer;

   functions->MapRenderbuffer = st_MapRenderbuffer;
   functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
}