1/**************************************************************************
2 *
3 * Copyright 2007 VMware, Inc.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28
29/**
30 * Framebuffer/renderbuffer functions.
31 *
32 * \author Brian Paul
33 */
34
35
36#include "main/imports.h"
37#include "main/context.h"
38#include "main/fbobject.h"
39#include "main/framebuffer.h"
40#include "main/glformats.h"
41#include "main/macros.h"
42#include "main/renderbuffer.h"
43#include "main/state.h"
44
45#include "pipe/p_context.h"
46#include "pipe/p_defines.h"
47#include "pipe/p_screen.h"
48#include "st_atom.h"
49#include "st_context.h"
50#include "st_cb_fbo.h"
51#include "st_cb_flush.h"
52#include "st_cb_texture.h"
53#include "st_format.h"
54#include "st_texture.h"
55#include "st_manager.h"
56
57#include "util/u_format.h"
58#include "util/u_inlines.h"
59#include "util/u_surface.h"
60
61
62static GLboolean
63st_renderbuffer_alloc_sw_storage(struct gl_context * ctx,
64                                 struct gl_renderbuffer *rb,
65                                 GLenum internalFormat,
66                                 GLuint width, GLuint height)
67{
68   struct st_context *st = st_context(ctx);
69   struct st_renderbuffer *strb = st_renderbuffer(rb);
70   enum pipe_format format;
71   size_t size;
72
73   free(strb->data);
74   strb->data = NULL;
75
76   if (internalFormat == GL_RGBA16_SNORM) {
77      /* Special case for software accum buffers.  Otherwise, if the
78       * call to st_choose_renderbuffer_format() fails (because the
79       * driver doesn't support signed 16-bit/channel colors) we'd
80       * just return without allocating the software accum buffer.
81       */
82      format = PIPE_FORMAT_R16G16B16A16_SNORM;
83   }
84   else {
85      format = st_choose_renderbuffer_format(st, internalFormat, 0);
86
87      /* Not setting gl_renderbuffer::Format here will cause
88       * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
89       */
90      if (format == PIPE_FORMAT_NONE) {
91         return GL_TRUE;
92      }
93   }
94
95   strb->Base.Format = st_pipe_format_to_mesa_format(format);
96
97   size = _mesa_format_image_size(strb->Base.Format, width, height, 1);
98   strb->data = malloc(size);
99   return strb->data != NULL;
100}
101
102
103/**
104 * gl_renderbuffer::AllocStorage()
105 * This is called to allocate the original drawing surface, and
106 * during window resize.
107 */
108static GLboolean
109st_renderbuffer_alloc_storage(struct gl_context * ctx,
110                              struct gl_renderbuffer *rb,
111                              GLenum internalFormat,
112                              GLuint width, GLuint height)
113{
114   struct st_context *st = st_context(ctx);
115   struct pipe_context *pipe = st->pipe;
116   struct pipe_screen *screen = st->pipe->screen;
117   struct st_renderbuffer *strb = st_renderbuffer(rb);
118   enum pipe_format format = PIPE_FORMAT_NONE;
119   struct pipe_surface surf_tmpl;
120   struct pipe_resource templ;
121
122   /* init renderbuffer fields */
123   strb->Base.Width  = width;
124   strb->Base.Height = height;
125   strb->Base._BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
126   strb->defined = GL_FALSE;  /* undefined contents now */
127
128   if (strb->software) {
129      return st_renderbuffer_alloc_sw_storage(ctx, rb, internalFormat,
130                                              width, height);
131   }
132
133   /* Free the old surface and texture
134    */
135   pipe_surface_reference( &strb->surface, NULL );
136   pipe_resource_reference( &strb->texture, NULL );
137
138   /* If an sRGB framebuffer is unsupported, sRGB formats behave like linear
139    * formats.
140    */
141   if (!ctx->Extensions.EXT_framebuffer_sRGB) {
142      internalFormat = _mesa_get_linear_internalformat(internalFormat);
143   }
144
145   /* Handle multisample renderbuffers first.
146    *
147    * From ARB_framebuffer_object:
148    *   If <samples> is zero, then RENDERBUFFER_SAMPLES is set to zero.
149    *   Otherwise <samples> represents a request for a desired minimum
150    *   number of samples. Since different implementations may support
151    *   different sample counts for multisampled rendering, the actual
152    *   number of samples allocated for the renderbuffer image is
153    *   implementation dependent.  However, the resulting value for
154    *   RENDERBUFFER_SAMPLES is guaranteed to be greater than or equal
155    *   to <samples> and no more than the next larger sample count supported
156    *   by the implementation.
157    *
158    * So let's find the supported number of samples closest to NumSamples.
159    * (NumSamples == 1) is treated the same as (NumSamples == 0).
160    */
161   if (rb->NumSamples > 1) {
162      unsigned i;
163
164      for (i = rb->NumSamples; i <= ctx->Const.MaxSamples; i++) {
165         format = st_choose_renderbuffer_format(st, internalFormat, i);
166
167         if (format != PIPE_FORMAT_NONE) {
168            rb->NumSamples = i;
169            break;
170         }
171      }
172   } else {
173      format = st_choose_renderbuffer_format(st, internalFormat, 0);
174   }
175
176   /* Not setting gl_renderbuffer::Format here will cause
177    * FRAMEBUFFER_UNSUPPORTED and ValidateFramebuffer will not be called.
178    */
179   if (format == PIPE_FORMAT_NONE) {
180      return GL_TRUE;
181   }
182
183   strb->Base.Format = st_pipe_format_to_mesa_format(format);
184
185   if (width == 0 || height == 0) {
186      /* if size is zero, nothing to allocate */
187      return GL_TRUE;
188   }
189
190   /* Setup new texture template.
191    */
192   memset(&templ, 0, sizeof(templ));
193   templ.target = st->internal_target;
194   templ.format = format;
195   templ.width0 = width;
196   templ.height0 = height;
197   templ.depth0 = 1;
198   templ.array_size = 1;
199   templ.nr_samples = rb->NumSamples;
200   if (util_format_is_depth_or_stencil(format)) {
201      templ.bind = PIPE_BIND_DEPTH_STENCIL;
202   }
203   else if (strb->Base.Name != 0) {
204      /* this is a user-created renderbuffer */
205      templ.bind = PIPE_BIND_RENDER_TARGET;
206   }
207   else {
208      /* this is a window-system buffer */
209      templ.bind = (PIPE_BIND_DISPLAY_TARGET |
210                    PIPE_BIND_RENDER_TARGET);
211   }
212
213   strb->texture = screen->resource_create(screen, &templ);
214
215   if (!strb->texture)
216      return FALSE;
217
218   u_surface_default_template(&surf_tmpl, strb->texture);
219   strb->surface = pipe->create_surface(pipe,
220                                        strb->texture,
221                                        &surf_tmpl);
222   if (strb->surface) {
223      assert(strb->surface->texture);
224      assert(strb->surface->format);
225      assert(strb->surface->width == width);
226      assert(strb->surface->height == height);
227   }
228
229   return strb->surface != NULL;
230}
231
232
233/**
234 * gl_renderbuffer::Delete()
235 */
236static void
237st_renderbuffer_delete(struct gl_context *ctx, struct gl_renderbuffer *rb)
238{
239   struct st_renderbuffer *strb = st_renderbuffer(rb);
240   if (ctx) {
241      struct st_context *st = st_context(ctx);
242      pipe_surface_release(st->pipe, &strb->surface);
243   }
244   pipe_resource_reference(&strb->texture, NULL);
245   free(strb->data);
246   _mesa_delete_renderbuffer(ctx, rb);
247}
248
249
250/**
251 * Called via ctx->Driver.NewRenderbuffer()
252 */
253static struct gl_renderbuffer *
254st_new_renderbuffer(struct gl_context *ctx, GLuint name)
255{
256   struct st_renderbuffer *strb = ST_CALLOC_STRUCT(st_renderbuffer);
257   if (strb) {
258      assert(name != 0);
259      _mesa_init_renderbuffer(&strb->Base, name);
260      strb->Base.Delete = st_renderbuffer_delete;
261      strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
262      return &strb->Base;
263   }
264   return NULL;
265}
266
267
268/**
269 * Allocate a renderbuffer for an on-screen window (not a user-created
270 * renderbuffer).  The window system code determines the format.
271 */
272struct gl_renderbuffer *
273st_new_renderbuffer_fb(enum pipe_format format, int samples, boolean sw)
274{
275   struct st_renderbuffer *strb;
276
277   strb = ST_CALLOC_STRUCT(st_renderbuffer);
278   if (!strb) {
279      _mesa_error(NULL, GL_OUT_OF_MEMORY, "creating renderbuffer");
280      return NULL;
281   }
282
283   _mesa_init_renderbuffer(&strb->Base, 0);
284   strb->Base.ClassID = 0x4242; /* just a unique value */
285   strb->Base.NumSamples = samples;
286   strb->Base.Format = st_pipe_format_to_mesa_format(format);
287   strb->Base._BaseFormat = _mesa_get_format_base_format(strb->Base.Format);
288   strb->software = sw;
289
290   switch (format) {
291   case PIPE_FORMAT_R8G8B8A8_UNORM:
292   case PIPE_FORMAT_B8G8R8A8_UNORM:
293   case PIPE_FORMAT_A8R8G8B8_UNORM:
294      strb->Base.InternalFormat = GL_RGBA8;
295      break;
296   case PIPE_FORMAT_R8G8B8X8_UNORM:
297   case PIPE_FORMAT_B8G8R8X8_UNORM:
298   case PIPE_FORMAT_X8R8G8B8_UNORM:
299      strb->Base.InternalFormat = GL_RGB8;
300      break;
301   case PIPE_FORMAT_R8G8B8A8_SRGB:
302   case PIPE_FORMAT_B8G8R8A8_SRGB:
303   case PIPE_FORMAT_A8R8G8B8_SRGB:
304      strb->Base.InternalFormat = GL_SRGB8_ALPHA8;
305      break;
306   case PIPE_FORMAT_R8G8B8X8_SRGB:
307   case PIPE_FORMAT_B8G8R8X8_SRGB:
308   case PIPE_FORMAT_X8R8G8B8_SRGB:
309      strb->Base.InternalFormat = GL_SRGB8;
310      break;
311   case PIPE_FORMAT_B5G5R5A1_UNORM:
312      strb->Base.InternalFormat = GL_RGB5_A1;
313      break;
314   case PIPE_FORMAT_B4G4R4A4_UNORM:
315      strb->Base.InternalFormat = GL_RGBA4;
316      break;
317   case PIPE_FORMAT_B5G6R5_UNORM:
318      strb->Base.InternalFormat = GL_RGB565;
319      break;
320   case PIPE_FORMAT_Z16_UNORM:
321      strb->Base.InternalFormat = GL_DEPTH_COMPONENT16;
322      break;
323   case PIPE_FORMAT_Z32_UNORM:
324      strb->Base.InternalFormat = GL_DEPTH_COMPONENT32;
325      break;
326   case PIPE_FORMAT_Z24_UNORM_S8_UINT:
327   case PIPE_FORMAT_S8_UINT_Z24_UNORM:
328      strb->Base.InternalFormat = GL_DEPTH24_STENCIL8_EXT;
329      break;
330   case PIPE_FORMAT_Z24X8_UNORM:
331   case PIPE_FORMAT_X8Z24_UNORM:
332      strb->Base.InternalFormat = GL_DEPTH_COMPONENT24;
333      break;
334   case PIPE_FORMAT_S8_UINT:
335      strb->Base.InternalFormat = GL_STENCIL_INDEX8_EXT;
336      break;
337   case PIPE_FORMAT_R16G16B16A16_SNORM:
338      /* accum buffer */
339      strb->Base.InternalFormat = GL_RGBA16_SNORM;
340      break;
341   case PIPE_FORMAT_R16G16B16A16_UNORM:
342      strb->Base.InternalFormat = GL_RGBA16;
343      break;
344   case PIPE_FORMAT_R8_UNORM:
345      strb->Base.InternalFormat = GL_R8;
346      break;
347   case PIPE_FORMAT_R8G8_UNORM:
348      strb->Base.InternalFormat = GL_RG8;
349      break;
350   case PIPE_FORMAT_R16_UNORM:
351      strb->Base.InternalFormat = GL_R16;
352      break;
353   case PIPE_FORMAT_R16G16_UNORM:
354      strb->Base.InternalFormat = GL_RG16;
355      break;
356   case PIPE_FORMAT_R32G32B32A32_FLOAT:
357      strb->Base.InternalFormat = GL_RGBA32F;
358      break;
359   case PIPE_FORMAT_R16G16B16A16_FLOAT:
360      strb->Base.InternalFormat = GL_RGBA16F;
361      break;
362   default:
363      _mesa_problem(NULL,
364		    "Unexpected format %s in st_new_renderbuffer_fb",
365                    util_format_name(format));
366      free(strb);
367      return NULL;
368   }
369
370   /* st-specific methods */
371   strb->Base.Delete = st_renderbuffer_delete;
372   strb->Base.AllocStorage = st_renderbuffer_alloc_storage;
373
374   /* surface is allocated in st_renderbuffer_alloc_storage() */
375   strb->surface = NULL;
376
377   return &strb->Base;
378}
379
380
381/**
382 * Create or update the pipe_surface of a FBO renderbuffer.
383 * This is usually called after st_finalize_texture.
384 */
385void
386st_update_renderbuffer_surface(struct st_context *st,
387                               struct st_renderbuffer *strb)
388{
389   struct pipe_context *pipe = st->pipe;
390   struct pipe_resource *resource = strb->texture;
391   struct st_texture_object *stTexObj = NULL;
392   unsigned rtt_width = strb->Base.Width;
393   unsigned rtt_height = strb->Base.Height;
394   unsigned rtt_depth = strb->Base.Depth;
395   /*
396    * For winsys fbo, it is possible that the renderbuffer is sRGB-capable but
397    * the format of strb->texture is linear (because we have no control over
398    * the format).  Check strb->Base.Format instead of strb->texture->format
399    * to determine if the rb is sRGB-capable.
400    */
401   boolean enable_srgb = (st->ctx->Color.sRGBEnabled &&
402         _mesa_get_format_color_encoding(strb->Base.Format) == GL_SRGB);
403   enum pipe_format format = resource->format;
404
405   if (strb->is_rtt) {
406      stTexObj = st_texture_object(strb->Base.TexImage->TexObject);
407      if (stTexObj->surface_based)
408         format = stTexObj->surface_format;
409   }
410
411   format = (enable_srgb) ?
412      util_format_srgb(format) :
413      util_format_linear(format);
414
415   unsigned first_layer, last_layer, level;
416
417   if (resource->target == PIPE_TEXTURE_1D_ARRAY) {
418      rtt_depth = rtt_height;
419      rtt_height = 1;
420   }
421
422   /* find matching mipmap level size */
423   for (level = 0; level <= resource->last_level; level++) {
424      if (u_minify(resource->width0, level) == rtt_width &&
425          u_minify(resource->height0, level) == rtt_height &&
426          (resource->target != PIPE_TEXTURE_3D ||
427           u_minify(resource->depth0, level) == rtt_depth)) {
428         break;
429      }
430   }
431   assert(level <= resource->last_level);
432
433   /* determine the layer bounds */
434   if (strb->rtt_layered) {
435      first_layer = 0;
436      last_layer = util_max_layer(strb->texture, level);
437   }
438   else {
439      first_layer =
440      last_layer = strb->rtt_face + strb->rtt_slice;
441   }
442
443   /* Adjust for texture views */
444   if (strb->is_rtt && resource->array_size > 1 &&
445       stTexObj->base.Immutable) {
446      struct gl_texture_object *tex = &stTexObj->base;
447      first_layer += tex->MinLayer;
448      if (!strb->rtt_layered)
449         last_layer += tex->MinLayer;
450      else
451         last_layer = MIN2(first_layer + tex->NumLayers - 1, last_layer);
452   }
453
454   if (!strb->surface ||
455       strb->surface->texture->nr_samples != strb->Base.NumSamples ||
456       strb->surface->format != format ||
457       strb->surface->texture != resource ||
458       strb->surface->width != rtt_width ||
459       strb->surface->height != rtt_height ||
460       strb->surface->u.tex.level != level ||
461       strb->surface->u.tex.first_layer != first_layer ||
462       strb->surface->u.tex.last_layer != last_layer) {
463      /* create a new pipe_surface */
464      struct pipe_surface surf_tmpl;
465      memset(&surf_tmpl, 0, sizeof(surf_tmpl));
466      surf_tmpl.format = format;
467      surf_tmpl.u.tex.level = level;
468      surf_tmpl.u.tex.first_layer = first_layer;
469      surf_tmpl.u.tex.last_layer = last_layer;
470
471      pipe_surface_release(pipe, &strb->surface);
472
473      strb->surface = pipe->create_surface(pipe, resource, &surf_tmpl);
474   }
475}
476
477/**
478 * Called by ctx->Driver.RenderTexture
479 */
480static void
481st_render_texture(struct gl_context *ctx,
482                  struct gl_framebuffer *fb,
483                  struct gl_renderbuffer_attachment *att)
484{
485   struct st_context *st = st_context(ctx);
486   struct pipe_context *pipe = st->pipe;
487   struct gl_renderbuffer *rb = att->Renderbuffer;
488   struct st_renderbuffer *strb = st_renderbuffer(rb);
489   struct pipe_resource *pt;
490
491   if (!st_finalize_texture(ctx, pipe, att->Texture, att->CubeMapFace))
492      return;
493
494   pt = st_get_texobj_resource(att->Texture);
495   assert(pt);
496
497   /* point renderbuffer at texobject */
498   strb->is_rtt = TRUE;
499   strb->rtt_face = att->CubeMapFace;
500   strb->rtt_slice = att->Zoffset;
501   strb->rtt_layered = att->Layered;
502   pipe_resource_reference(&strb->texture, pt);
503
504   st_update_renderbuffer_surface(st, strb);
505
506   /* Invalidate buffer state so that the pipe's framebuffer state
507    * gets updated.
508    * That's where the new renderbuffer (which we just created) gets
509    * passed to the pipe as a (color/depth) render target.
510    */
511   st_invalidate_state(ctx, _NEW_BUFFERS);
512
513
514   /* Need to trigger a call to update_framebuffer() since we just
515    * attached a new renderbuffer.
516    */
517   ctx->NewState |= _NEW_BUFFERS;
518}
519
520
521/**
522 * Called via ctx->Driver.FinishRenderTexture.
523 */
524static void
525st_finish_render_texture(struct gl_context *ctx, struct gl_renderbuffer *rb)
526{
527   struct st_renderbuffer *strb = st_renderbuffer(rb);
528
529   if (!strb)
530      return;
531
532   strb->is_rtt = FALSE;
533
534   /* restore previous framebuffer state */
535   st_invalidate_state(ctx, _NEW_BUFFERS);
536}
537
538
539/** Debug helper */
540static void
541st_fbo_invalid(const char *reason)
542{
543   if (MESA_DEBUG_FLAGS & DEBUG_INCOMPLETE_FBO) {
544      _mesa_debug(NULL, "Invalid FBO: %s\n", reason);
545   }
546}
547
548
549/**
550 * Validate a renderbuffer attachment for a particular set of bindings.
551 */
552static GLboolean
553st_validate_attachment(struct gl_context *ctx,
554		       struct pipe_screen *screen,
555		       const struct gl_renderbuffer_attachment *att,
556		       unsigned bindings)
557{
558   const struct st_texture_object *stObj = st_texture_object(att->Texture);
559   enum pipe_format format;
560   mesa_format texFormat;
561   GLboolean valid;
562
563   /* Sanity check: we must be binding the surface as a (color) render target
564    * or depth/stencil target.
565    */
566   assert(bindings == PIPE_BIND_RENDER_TARGET ||
567          bindings == PIPE_BIND_DEPTH_STENCIL);
568
569   /* Only validate texture attachments for now, since
570    * st_renderbuffer_alloc_storage makes sure that
571    * the format is supported.
572    */
573   if (att->Type != GL_TEXTURE)
574      return GL_TRUE;
575
576   if (!stObj || !stObj->pt)
577      return GL_FALSE;
578
579   format = stObj->pt->format;
580   texFormat = att->Renderbuffer->TexImage->TexFormat;
581
582   /* If the encoding is sRGB and sRGB rendering cannot be enabled,
583    * check for linear format support instead.
584    * Later when we create a surface, we change the format to a linear one. */
585   if (!ctx->Extensions.EXT_framebuffer_sRGB &&
586       _mesa_get_format_color_encoding(texFormat) == GL_SRGB) {
587      const mesa_format linearFormat = _mesa_get_srgb_format_linear(texFormat);
588      format = st_mesa_format_to_pipe_format(st_context(ctx), linearFormat);
589   }
590
591   valid = screen->is_format_supported(screen, format,
592                                      PIPE_TEXTURE_2D,
593                                      stObj->pt->nr_samples, bindings);
594   if (!valid) {
595      st_fbo_invalid("Invalid format");
596   }
597
598   return valid;
599}
600
601
602/**
603 * Check that the framebuffer configuration is valid in terms of what
604 * the driver can support.
605 *
606 * For Gallium we only supports combined Z+stencil, not separate buffers.
607 */
608static void
609st_validate_framebuffer(struct gl_context *ctx, struct gl_framebuffer *fb)
610{
611   struct st_context *st = st_context(ctx);
612   struct pipe_screen *screen = st->pipe->screen;
613   const struct gl_renderbuffer_attachment *depth =
614         &fb->Attachment[BUFFER_DEPTH];
615   const struct gl_renderbuffer_attachment *stencil =
616         &fb->Attachment[BUFFER_STENCIL];
617   GLuint i;
618   enum pipe_format first_format = PIPE_FORMAT_NONE;
619   boolean mixed_formats =
620         screen->get_param(screen, PIPE_CAP_MIXED_COLORBUFFER_FORMATS) != 0;
621
622   if (depth->Type && stencil->Type && depth->Type != stencil->Type) {
623      st_fbo_invalid("Different Depth/Stencil buffer formats");
624      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
625      return;
626   }
627   if (depth->Type == GL_RENDERBUFFER_EXT &&
628       stencil->Type == GL_RENDERBUFFER_EXT &&
629       depth->Renderbuffer != stencil->Renderbuffer) {
630      st_fbo_invalid("Separate Depth/Stencil buffers");
631      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
632      return;
633   }
634   if (depth->Type == GL_TEXTURE &&
635       stencil->Type == GL_TEXTURE &&
636       depth->Texture != stencil->Texture) {
637      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
638      st_fbo_invalid("Different Depth/Stencil textures");
639      return;
640   }
641
642   if (!st_validate_attachment(ctx,
643                               screen,
644                               depth,
645			       PIPE_BIND_DEPTH_STENCIL)) {
646      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
647      st_fbo_invalid("Invalid depth attachment");
648      return;
649   }
650   if (!st_validate_attachment(ctx,
651                               screen,
652                               stencil,
653			       PIPE_BIND_DEPTH_STENCIL)) {
654      fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
655      st_fbo_invalid("Invalid stencil attachment");
656      return;
657   }
658   for (i = 0; i < ctx->Const.MaxColorAttachments; i++) {
659      struct gl_renderbuffer_attachment *att =
660            &fb->Attachment[BUFFER_COLOR0 + i];
661      enum pipe_format format;
662
663      if (!st_validate_attachment(ctx,
664                                  screen,
665				  att,
666				  PIPE_BIND_RENDER_TARGET)) {
667	 fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
668	 st_fbo_invalid("Invalid color attachment");
669	 return;
670      }
671
672      if (!mixed_formats) {
673         /* Disallow mixed formats. */
674         if (att->Type != GL_NONE) {
675            format = st_renderbuffer(att->Renderbuffer)->surface->format;
676         } else {
677            continue;
678         }
679
680         if (first_format == PIPE_FORMAT_NONE) {
681            first_format = format;
682         } else if (format != first_format) {
683            fb->_Status = GL_FRAMEBUFFER_UNSUPPORTED_EXT;
684            st_fbo_invalid("Mixed color formats");
685            return;
686         }
687      }
688   }
689}
690
691
692/**
693 * Called via glDrawBuffer.
694 */
695static void
696st_DrawBuffers(struct gl_context *ctx, GLsizei count, const GLenum *buffers)
697{
698   struct st_context *st = st_context(ctx);
699   struct gl_framebuffer *fb = ctx->DrawBuffer;
700   GLuint i;
701
702   (void) count;
703   (void) buffers;
704
705   /* add the renderbuffers on demand */
706   for (i = 0; i < fb->_NumColorDrawBuffers; i++) {
707      GLint idx = fb->_ColorDrawBufferIndexes[i];
708
709      if (idx >= 0) {
710         st_manager_add_color_renderbuffer(st, fb, idx);
711      }
712   }
713}
714
715
716/**
717 * Called via glReadBuffer.
718 */
719static void
720st_ReadBuffer(struct gl_context *ctx, GLenum buffer)
721{
722   struct st_context *st = st_context(ctx);
723   struct gl_framebuffer *fb = ctx->ReadBuffer;
724
725   (void) buffer;
726
727   /* Check if we need to allocate a front color buffer.
728    * Front buffers are often allocated on demand (other color buffers are
729    * always allocated in advance).
730    */
731   if ((fb->_ColorReadBufferIndex == BUFFER_FRONT_LEFT ||
732        fb->_ColorReadBufferIndex == BUFFER_FRONT_RIGHT) &&
733       fb->Attachment[fb->_ColorReadBufferIndex].Type == GL_NONE) {
734      /* add the buffer */
735      st_manager_add_color_renderbuffer(st, fb, fb->_ColorReadBufferIndex);
736      _mesa_update_state(ctx);
737      st_validate_state(st, ST_PIPELINE_RENDER);
738   }
739}
740
741
742
743/**
744 * Called via ctx->Driver.MapRenderbuffer.
745 */
746static void
747st_MapRenderbuffer(struct gl_context *ctx,
748                   struct gl_renderbuffer *rb,
749                   GLuint x, GLuint y, GLuint w, GLuint h,
750                   GLbitfield mode,
751                   GLubyte **mapOut, GLint *rowStrideOut)
752{
753   struct st_context *st = st_context(ctx);
754   struct st_renderbuffer *strb = st_renderbuffer(rb);
755   struct pipe_context *pipe = st->pipe;
756   const GLboolean invert = rb->Name == 0;
757   unsigned usage;
758   GLuint y2;
759   GLubyte *map;
760
761   if (strb->software) {
762      /* software-allocated renderbuffer (probably an accum buffer) */
763      if (strb->data) {
764         GLint bpp = _mesa_get_format_bytes(strb->Base.Format);
765         GLint stride = _mesa_format_row_stride(strb->Base.Format,
766                                                strb->Base.Width);
767         *mapOut = (GLubyte *) strb->data + y * stride + x * bpp;
768         *rowStrideOut = stride;
769      }
770      else {
771         *mapOut = NULL;
772         *rowStrideOut = 0;
773      }
774      return;
775   }
776
777   usage = 0x0;
778   if (mode & GL_MAP_READ_BIT)
779      usage |= PIPE_TRANSFER_READ;
780   if (mode & GL_MAP_WRITE_BIT)
781      usage |= PIPE_TRANSFER_WRITE;
782   if (mode & GL_MAP_INVALIDATE_RANGE_BIT)
783      usage |= PIPE_TRANSFER_DISCARD_RANGE;
784
785   /* Note: y=0=bottom of buffer while y2=0=top of buffer.
786    * 'invert' will be true for window-system buffers and false for
787    * user-allocated renderbuffers and textures.
788    */
789   if (invert)
790      y2 = strb->Base.Height - y - h;
791   else
792      y2 = y;
793
794    map = pipe_transfer_map(pipe,
795                            strb->texture,
796                            strb->surface->u.tex.level,
797                            strb->surface->u.tex.first_layer,
798                            usage, x, y2, w, h, &strb->transfer);
799   if (map) {
800      if (invert) {
801         *rowStrideOut = -(int) strb->transfer->stride;
802         map += (h - 1) * strb->transfer->stride;
803      }
804      else {
805         *rowStrideOut = strb->transfer->stride;
806      }
807      *mapOut = map;
808   }
809   else {
810      *mapOut = NULL;
811      *rowStrideOut = 0;
812   }
813}
814
815
816/**
817 * Called via ctx->Driver.UnmapRenderbuffer.
818 */
819static void
820st_UnmapRenderbuffer(struct gl_context *ctx,
821                     struct gl_renderbuffer *rb)
822{
823   struct st_context *st = st_context(ctx);
824   struct st_renderbuffer *strb = st_renderbuffer(rb);
825   struct pipe_context *pipe = st->pipe;
826
827   if (strb->software) {
828      /* software-allocated renderbuffer (probably an accum buffer) */
829      return;
830   }
831
832   pipe_transfer_unmap(pipe, strb->transfer);
833   strb->transfer = NULL;
834}
835
836
837
838void st_init_fbo_functions(struct dd_function_table *functions)
839{
840   functions->NewFramebuffer = _mesa_new_framebuffer;
841   functions->NewRenderbuffer = st_new_renderbuffer;
842   functions->FramebufferRenderbuffer = _mesa_FramebufferRenderbuffer_sw;
843   functions->RenderTexture = st_render_texture;
844   functions->FinishRenderTexture = st_finish_render_texture;
845   functions->ValidateFramebuffer = st_validate_framebuffer;
846
847   functions->DrawBuffers = st_DrawBuffers;
848   functions->ReadBuffer = st_ReadBuffer;
849
850   functions->MapRenderbuffer = st_MapRenderbuffer;
851   functions->UnmapRenderbuffer = st_UnmapRenderbuffer;
852}
853
854
855