aboutsummaryrefslogtreecommitdiffstats
path: root/src/mesa/state_tracker/st_cb_fbo.c
blob: 9f2fe7420d4b0168fd0a8aa01425ea14ed9a5a82 (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
/**************************************************************************
 * 
 * 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/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_format.h"
#include "st_public.h"
#include "st_texture.h"

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


/**
 * Compute the renderbuffer's Red/Green/EtcBit fields from the pipe format.
 */
static int
init_renderbuffer_bits(struct st_renderbuffer *strb,
                       enum pipe_format pipeFormat)
{
   struct pipe_format_info info;

   if (!st_get_format_info( pipeFormat, &info )) {
      assert( 0 );
   }

   strb->Base.Format = info.mesa_format;
   strb->Base.DataType = st_format_datatype(pipeFormat);

   return info.size;
}

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

   if (strb->format != PIPE_FORMAT_NONE)
      format = strb->format;
   else
      format = st_choose_renderbuffer_format(pipe->screen, internalFormat);
      
   /* init renderbuffer fields */
   strb->Base.Width  = width;
   strb->Base.Height = height;
   init_renderbuffer_bits(strb, format);

   strb->defined = GL_FALSE;  /* undefined contents now */

   if(strb->software) {
      size_t size;
      
      _mesa_free(strb->data);

      assert(strb->format != PIPE_FORMAT_NONE);
      
      strb->stride = util_format_get_stride(strb->format, width);
      size = util_format_get_2d_size(strb->format, strb->stride, height);
      
      strb->data = _mesa_malloc(size);
      
      return strb->data != NULL;
   }
   else {
      struct pipe_texture template;
      unsigned surface_usage;
    
      /* Free the old surface and texture
       */
      pipe_surface_reference( &strb->surface, NULL );
      pipe_texture_reference( &strb->texture, NULL );

      /* Setup new texture template.
       */
      memset(&template, 0, sizeof(template));
      template.target = PIPE_TEXTURE_2D;
      template.format = format;
      template.width0 = width;
      template.height0 = height;
      template.depth0 = 1;
      template.last_level = 0;
      template.nr_samples = rb->NumSamples;
      if (util_format_is_depth_or_stencil(format)) {
         template.tex_usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
      }
      else {
         template.tex_usage = (PIPE_TEXTURE_USAGE_DISPLAY_TARGET |
                               PIPE_TEXTURE_USAGE_RENDER_TARGET);
      }

      /* Probably need dedicated flags for surface usage too: 
       */
      surface_usage = (PIPE_BUFFER_USAGE_GPU_READ |
                       PIPE_BUFFER_USAGE_GPU_WRITE);
#if 0
                       PIPE_BUFFER_USAGE_CPU_READ |
                       PIPE_BUFFER_USAGE_CPU_WRITE);
#endif

      strb->texture = pipe->screen->texture_create( pipe->screen,
                                                    &template );

      if (!strb->texture) 
         return FALSE;

      strb->surface = pipe->screen->get_tex_surface( pipe->screen,
                                                     strb->texture,
                                                     0, 0, 0,
                                                     surface_usage );
      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_texture_reference(&strb->texture, NULL);
   _mesa_free(strb->data);
   _mesa_free(strb);
}


/**
 * gl_renderbuffer::GetPointer()
 */
static void *
null_get_pointer(GLcontext * ctx, struct gl_renderbuffer *rb,
                 GLint x, GLint y)
{
   /* By returning NULL we force all software rendering to go through
    * the span routines.
    */
#if 0
   assert(0);  /* Should never get called with softpipe */
#endif
   return NULL;
}


/**
 * Called via ctx->Driver.NewFramebuffer()
 */
static struct gl_framebuffer *
st_new_framebuffer(GLcontext *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(GLcontext *ctx, GLuint name)
{
   struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
   if (strb) {
      _mesa_init_renderbuffer(&strb->Base, name);
      strb->Base.Delete = st_renderbuffer_delete;
      strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
      strb->Base.GetPointer = null_get_pointer;
      strb->format = PIPE_FORMAT_NONE;
      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->format = format;
   init_renderbuffer_bits(strb, format);
   strb->software = sw;
   
   switch (format) {
   case PIPE_FORMAT_A8R8G8B8_UNORM:
   case PIPE_FORMAT_B8G8R8A8_UNORM:
   case PIPE_FORMAT_X8R8G8B8_UNORM:
   case PIPE_FORMAT_B8G8R8X8_UNORM:
   case PIPE_FORMAT_A1R5G5B5_UNORM:
   case PIPE_FORMAT_A4R4G4B4_UNORM:
   case PIPE_FORMAT_R5G6B5_UNORM:
      strb->Base.InternalFormat = GL_RGBA;
      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_S8Z24_UNORM:
   case PIPE_FORMAT_Z24S8_UNORM:
   case PIPE_FORMAT_X8Z24_UNORM:
   case PIPE_FORMAT_Z24X8_UNORM:
      strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
      break;
   case PIPE_FORMAT_S8_UNORM:
      strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
      break;
   case PIPE_FORMAT_R16G16B16A16_SNORM:
      strb->Base.InternalFormat = GL_RGBA16;
      break;
   default:
      _mesa_problem(NULL,
		    "Unexpected format in st_new_renderbuffer_fb");
      _mesa_free(strb);
      return NULL;
   }

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

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

   return &strb->Base;
}




/**
 * Called via ctx->Driver.BindFramebufferEXT().
 */
static void
st_bind_framebuffer(GLcontext *ctx, GLenum target,
                    struct gl_framebuffer *fb, struct gl_framebuffer *fbread)
{

}

/**
 * Called by ctx->Driver.FramebufferRenderbuffer
 */
static void
st_framebuffer_renderbuffer(GLcontext *ctx, 
                            struct gl_framebuffer *fb,
                            GLenum attachment,
                            struct gl_renderbuffer *rb)
{
   /* XXX no need for derivation? */
   _mesa_framebuffer_renderbuffer(ctx, fb, attachment, rb);
}


/**
 * Called by ctx->Driver.RenderTexture
 */
static void
st_render_texture(GLcontext *ctx,
                  struct gl_framebuffer *fb,
                  struct gl_renderbuffer_attachment *att)
{
   struct pipe_screen *screen = ctx->st->pipe->screen;
   struct st_renderbuffer *strb;
   struct gl_renderbuffer *rb;
   struct pipe_texture *pt = st_get_texobj_texture(att->Texture);
   struct st_texture_object *stObj;
   const struct gl_texture_image *texImage =
      att->Texture->Image[att->CubeMapFace][att->TextureLevel];

   if (!pt) 
      return;

   /* create new renderbuffer which wraps the texture image */
   rb = st_new_renderbuffer(ctx, 0);
   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;
   /*printf("***** render to texture level %d: %d x %d\n", att->TextureLevel, rb->Width, rb->Height);*/

   /*printf("***** pipe texture %d x %d\n", pt->width0, pt->height0);*/

   pipe_texture_reference( &strb->texture, pt );

   pipe_surface_reference(&strb->surface, NULL);

   /* new surface for rendering into the texture */
   strb->surface = screen->get_tex_surface(screen,
                                           strb->texture,
                                           strb->rtt_face,
                                           strb->rtt_level,
                                           strb->rtt_slice,
                                           PIPE_BUFFER_USAGE_GPU_READ |
                                           PIPE_BUFFER_USAGE_GPU_WRITE);

   init_renderbuffer_bits(strb, pt->format);

   /*
   printf("RENDER TO TEXTURE obj=%p pt=%p surf=%p  %d x %d\n",
          att->Texture, pt, strb->surface, rb->Width, rb->Height);
   */

   /* 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);
}


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

   if (!strb)
      return;

   st_flush( ctx->st, PIPE_FLUSH_RENDER_CACHE, NULL );

   if (strb->surface)
      pipe_surface_reference( &strb->surface, NULL );

   strb->rtt = NULL;

   /*
   printf("FINISH RENDER TO TEXTURE surf=%p\n", strb->surface);
   */

   _mesa_reference_renderbuffer(&att->Renderbuffer, NULL);

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


/**
 * Validate a renderbuffer attachment for a particular usage.
 */

static GLboolean
st_validate_attachment(struct pipe_screen *screen,
		       const struct gl_renderbuffer_attachment *att,
		       GLuint usage)
{
   const struct st_texture_object *stObj =
      st_texture_object(att->Texture);

   /**
    * 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;

   return screen->is_format_supported(screen, stObj->pt->format,
				      PIPE_TEXTURE_2D,
				      usage, 0);
}

/**
 * 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(GLcontext *ctx, struct gl_framebuffer *fb)
{
   struct pipe_screen *screen = ctx->st->pipe->screen;
   const struct gl_renderbuffer *depthRb =
      fb->Attachment[BUFFER_DEPTH].Renderbuffer;
   const struct gl_renderbuffer *stencilRb =
      fb->Attachment[BUFFER_STENCIL].Renderbuffer;
   GLuint i;

   if (stencilRb && depthRb && stencilRb != depthRb) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }

   if (!st_validate_attachment(screen,
			       &fb->Attachment[BUFFER_DEPTH],
			       PIPE_TEXTURE_USAGE_DEPTH_STENCIL)) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   if (!st_validate_attachment(screen,
			       &fb->Attachment[BUFFER_STENCIL],
			       PIPE_TEXTURE_USAGE_DEPTH_STENCIL)) {
      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
      return;
   }
   for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
      if (!st_validate_attachment(screen,
				  &fb->Attachment[BUFFER_COLOR0 + i],
				  PIPE_TEXTURE_USAGE_RENDER_TARGET)) {
	 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
	 return;
      }
   }
}


/**
 * Copy back color buffer to front color buffer.
 */
static void
copy_back_to_front(struct st_context *st,
                   struct gl_framebuffer *fb,
                   gl_buffer_index frontIndex,
                   gl_buffer_index backIndex)

{
   struct st_framebuffer *stfb = (struct st_framebuffer *) fb;
   struct pipe_surface *surf_front, *surf_back;

   (void) st_get_framebuffer_surface(stfb, frontIndex, &surf_front);
   (void) st_get_framebuffer_surface(stfb, backIndex, &surf_back);

   if (surf_front && surf_back) {
      if (st->pipe->surface_copy) {
         st->pipe->surface_copy(st->pipe,
                                surf_front, 0, 0,  /* dest */
                                surf_back, 0, 0,   /* src */
                                fb->Width, fb->Height);
      } else {
         util_surface_copy(st->pipe, FALSE,
                           surf_front, 0, 0,
                           surf_back, 0, 0,
                           fb->Width, fb->Height);
      }
   }
}


/**
 * Check if we're drawing into, or read from, a front color buffer.  If the
 * front buffer is missing, create it now.
 *
 * The back color buffer must exist since we'll use its format/samples info
 * for creating the front buffer.
 *
 * \param frontIndex  either BUFFER_FRONT_LEFT or BUFFER_FRONT_RIGHT
 * \param backIndex  either BUFFER_BACK_LEFT or BUFFER_BACK_RIGHT
 */
static void
check_create_front_buffer(GLcontext *ctx, struct gl_framebuffer *fb,
                          gl_buffer_index frontIndex,
                          gl_buffer_index backIndex)
{
   if (fb->Attachment[frontIndex].Renderbuffer == NULL) {
      GLboolean create = GL_FALSE;

      /* check if drawing to or reading from front buffer */
      if (fb->_ColorReadBufferIndex == frontIndex) {
         create = GL_TRUE;
      }
      else {
         GLuint b;
         for (b = 0; b < fb->_NumColorDrawBuffers; b++) {
            if (fb->_ColorDrawBufferIndexes[b] == frontIndex) {
               create = GL_TRUE;
               break;
            }
         }
      }

      if (create) {
         struct st_renderbuffer *back;
         struct gl_renderbuffer *front;
         enum pipe_format colorFormat;
         uint samples;

         if (0)
            _mesa_debug(ctx, "Allocate new front buffer\n");

         /* get back renderbuffer info */
         back = st_renderbuffer(fb->Attachment[backIndex].Renderbuffer);
         colorFormat = back->format;
         samples = back->Base.NumSamples;

         /* create front renderbuffer */
         front = st_new_renderbuffer_fb(colorFormat, samples, FALSE);
         _mesa_add_renderbuffer(fb, frontIndex, front);

         /* alloc texture/surface for new front buffer */
         front->AllocStorage(ctx, front, front->InternalFormat,
                             fb->Width, fb->Height);

         /* initialize the front color buffer contents by copying
          * the back buffer.
          */
         copy_back_to_front(ctx->st, fb, frontIndex, backIndex);
      }
   }
}


/**
 * If front left/right color buffers are missing, create them now.
 */
static void
check_create_front_buffers(GLcontext *ctx, struct gl_framebuffer *fb)
{
   /* check if we need to create the front left buffer now */
   check_create_front_buffer(ctx, fb, BUFFER_FRONT_LEFT, BUFFER_BACK_LEFT);

   if (fb->Visual.stereoMode) {
      check_create_front_buffer(ctx, fb, BUFFER_FRONT_RIGHT, BUFFER_BACK_RIGHT);
   }

   st_invalidate_state(ctx, _NEW_BUFFERS);
}


/**
 * Called via glDrawBuffer.
 */
static void
st_DrawBuffers(GLcontext *ctx, GLsizei count, const GLenum *buffers)
{
   (void) count;
   (void) buffers;
   check_create_front_buffers(ctx, ctx->DrawBuffer);
}


/**
 * Called via glReadBuffer.
 */
static void
st_ReadBuffer(GLcontext *ctx, GLenum buffer)
{
   (void) buffer;
   check_create_front_buffers(ctx, ctx->ReadBuffer);
}


void st_init_fbo_functions(struct dd_function_table *functions)
{
   functions->NewFramebuffer = st_new_framebuffer;
   functions->NewRenderbuffer = st_new_renderbuffer;
   functions->BindFramebuffer = st_bind_framebuffer;
   functions->FramebufferRenderbuffer = st_framebuffer_renderbuffer;
   functions->RenderTexture = st_render_texture;
   functions->FinishRenderTexture = st_finish_render_texture;
   functions->ValidateFramebuffer = st_validate_framebuffer;
   /* no longer needed by core Mesa, drivers handle resizes...
   functions->ResizeBuffers = st_resize_buffers;
   */

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