u_blit.c revision f2bc089d148253d7a411e94257633ce40ec1c6a9 
1/**************************************************************************
2 *
3 * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
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 TUNGSTEN GRAPHICS 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 * @file
30 * Copy/blit pixel rect between surfaces
31 *
32 * @author Brian Paul
33 */
34
35
36#include "pipe/p_context.h"
37#include "util/u_debug.h"
38#include "pipe/p_defines.h"
39#include "util/u_inlines.h"
40#include "pipe/p_shader_tokens.h"
41#include "pipe/p_state.h"
42
43#include "util/u_blit.h"
44#include "util/u_draw_quad.h"
45#include "util/u_format.h"
46#include "util/u_math.h"
47#include "util/u_memory.h"
48#include "util/u_sampler.h"
49#include "util/u_simple_shaders.h"
50#include "util/u_surface.h"
51#include "util/u_rect.h"
52
53#include "cso_cache/cso_context.h"
54
55
56struct blit_state
57{
58   struct pipe_context *pipe;
59   struct cso_context *cso;
60
61   struct pipe_blend_state blend;
62   struct pipe_depth_stencil_alpha_state depthstencil;
63   struct pipe_rasterizer_state rasterizer;
64   struct pipe_sampler_state sampler;
65   struct pipe_viewport_state viewport;
66   struct pipe_clip_state clip;
67   struct pipe_vertex_element velem[2];
68
69   void *vs;
70   void *fs[TGSI_WRITEMASK_XYZW + 1];
71
72   struct pipe_buffer *vbuf;  /**< quad vertices */
73   unsigned vbuf_slot;
74
75   float vertices[4][2][4];   /**< vertex/texcoords for quad */
76};
77
78
79/**
80 * Create state object for blit.
81 * Intended to be created once and re-used for many blit() calls.
82 */
83struct blit_state *
84util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
85{
86   struct blit_state *ctx;
87   uint i;
88
89   ctx = CALLOC_STRUCT(blit_state);
90   if (!ctx)
91      return NULL;
92
93   ctx->pipe = pipe;
94   ctx->cso = cso;
95
96   /* disabled blending/masking */
97   memset(&ctx->blend, 0, sizeof(ctx->blend));
98   ctx->blend.rt[0].colormask = PIPE_MASK_RGBA;
99
100   /* no-op depth/stencil/alpha */
101   memset(&ctx->depthstencil, 0, sizeof(ctx->depthstencil));
102
103   /* rasterizer */
104   memset(&ctx->rasterizer, 0, sizeof(ctx->rasterizer));
105   ctx->rasterizer.front_winding = PIPE_WINDING_CW;
106   ctx->rasterizer.cull_mode = PIPE_WINDING_NONE;
107   ctx->rasterizer.gl_rasterization_rules = 1;
108
109   /* samplers */
110   memset(&ctx->sampler, 0, sizeof(ctx->sampler));
111   ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
112   ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
113   ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
114   ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
115   ctx->sampler.min_img_filter = 0; /* set later */
116   ctx->sampler.mag_img_filter = 0; /* set later */
117   ctx->sampler.normalized_coords = 1;
118
119   /* vertex elements state */
120   memset(&ctx->velem[0], 0, sizeof(ctx->velem[0]) * 2);
121   for (i = 0; i < 2; i++) {
122      ctx->velem[i].src_offset = i * 4 * sizeof(float);
123      ctx->velem[i].instance_divisor = 0;
124      ctx->velem[i].vertex_buffer_index = 0;
125      ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
126   }
127
128   /* vertex shader - still required to provide the linkage between
129    * fragment shader input semantics and vertex_element/buffers.
130    */
131   {
132      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
133                                      TGSI_SEMANTIC_GENERIC };
134      const uint semantic_indexes[] = { 0, 0 };
135      ctx->vs = util_make_vertex_passthrough_shader(pipe, 2, semantic_names,
136                                                    semantic_indexes);
137   }
138
139   /* fragment shader */
140   ctx->fs[TGSI_WRITEMASK_XYZW] =
141      util_make_fragment_tex_shader(pipe, TGSI_TEXTURE_2D);
142   ctx->vbuf = NULL;
143
144   /* init vertex data that doesn't change */
145   for (i = 0; i < 4; i++) {
146      ctx->vertices[i][0][3] = 1.0f; /* w */
147      ctx->vertices[i][1][2] = 0.0f; /* r */
148      ctx->vertices[i][1][3] = 1.0f; /* q */
149   }
150
151   return ctx;
152}
153
154
155/**
156 * Destroy a blit context
157 */
158void
159util_destroy_blit(struct blit_state *ctx)
160{
161   struct pipe_context *pipe = ctx->pipe;
162   unsigned i;
163
164   pipe->delete_vs_state(pipe, ctx->vs);
165
166   for (i = 0; i < Elements(ctx->fs); i++)
167      if (ctx->fs[i])
168         pipe->delete_fs_state(pipe, ctx->fs[i]);
169
170   pipe_buffer_reference(&ctx->vbuf, NULL);
171
172   FREE(ctx);
173}
174
175
176/**
177 * Get offset of next free slot in vertex buffer for quad vertices.
178 */
179static unsigned
180get_next_slot( struct blit_state *ctx )
181{
182   const unsigned max_slots = 4096 / sizeof ctx->vertices;
183
184   if (ctx->vbuf_slot >= max_slots)
185      util_blit_flush( ctx );
186
187   if (!ctx->vbuf) {
188      ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
189                                     32,
190                                     PIPE_BUFFER_USAGE_VERTEX,
191                                     max_slots * sizeof ctx->vertices);
192   }
193
194   return ctx->vbuf_slot++ * sizeof ctx->vertices;
195}
196
197
198
199
200
201/**
202 * Setup vertex data for the textured quad we'll draw.
203 * Note: y=0=top
204 */
205static unsigned
206setup_vertex_data_tex(struct blit_state *ctx,
207                      float x0, float y0, float x1, float y1,
208                      float s0, float t0, float s1, float t1,
209                      float z)
210{
211   unsigned offset;
212
213   ctx->vertices[0][0][0] = x0;
214   ctx->vertices[0][0][1] = y0;
215   ctx->vertices[0][0][2] = z;
216   ctx->vertices[0][1][0] = s0; /*s*/
217   ctx->vertices[0][1][1] = t0; /*t*/
218
219   ctx->vertices[1][0][0] = x1;
220   ctx->vertices[1][0][1] = y0;
221   ctx->vertices[1][0][2] = z;
222   ctx->vertices[1][1][0] = s1; /*s*/
223   ctx->vertices[1][1][1] = t0; /*t*/
224
225   ctx->vertices[2][0][0] = x1;
226   ctx->vertices[2][0][1] = y1;
227   ctx->vertices[2][0][2] = z;
228   ctx->vertices[2][1][0] = s1;
229   ctx->vertices[2][1][1] = t1;
230
231   ctx->vertices[3][0][0] = x0;
232   ctx->vertices[3][0][1] = y1;
233   ctx->vertices[3][0][2] = z;
234   ctx->vertices[3][1][0] = s0;
235   ctx->vertices[3][1][1] = t1;
236
237   offset = get_next_slot( ctx );
238
239   pipe_buffer_write_nooverlap(ctx->pipe->screen, ctx->vbuf,
240                               offset, sizeof(ctx->vertices), ctx->vertices);
241
242   return offset;
243}
244
245
246/**
247 * \return TRUE if two regions overlap, FALSE otherwise
248 */
249static boolean
250regions_overlap(int srcX0, int srcY0,
251                int srcX1, int srcY1,
252                int dstX0, int dstY0,
253                int dstX1, int dstY1)
254{
255   if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
256      return FALSE; /* src completely left of dst */
257
258   if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
259      return FALSE; /* dst completely left of src */
260
261   if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
262      return FALSE; /* src completely above dst */
263
264   if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
265      return FALSE; /* dst completely above src */
266
267   return TRUE; /* some overlap */
268}
269
270
271/**
272 * Copy pixel block from src surface to dst surface.
273 * Overlapping regions are acceptable.
274 * Flipping and stretching are supported.
275 * \param filter  one of PIPE_TEX_MIPFILTER_NEAREST/LINEAR
276 * \param writemask  controls which channels in the dest surface are sourced
277 *                   from the src surface.  Disabled channels are sourced
278 *                   from (0,0,0,1).
279 * XXX need some control over blitting Z and/or stencil.
280 */
281void
282util_blit_pixels_writemask(struct blit_state *ctx,
283                           struct pipe_surface *src,
284                           struct pipe_sampler_view *src_sampler_view,
285                           int srcX0, int srcY0,
286                           int srcX1, int srcY1,
287                           struct pipe_surface *dst,
288                           int dstX0, int dstY0,
289                           int dstX1, int dstY1,
290                           float z, uint filter,
291                           uint writemask)
292{
293   struct pipe_context *pipe = ctx->pipe;
294   struct pipe_screen *screen = pipe->screen;
295   struct pipe_texture *tex = NULL;
296   struct pipe_sampler_view *sampler_view = NULL;
297   struct pipe_framebuffer_state fb;
298   const int srcW = abs(srcX1 - srcX0);
299   const int srcH = abs(srcY1 - srcY0);
300   unsigned offset;
301   boolean overlap;
302   float s0, t0, s1, t1;
303
304   assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
305          filter == PIPE_TEX_MIPFILTER_LINEAR);
306
307   assert(screen->is_format_supported(screen, src->format, PIPE_TEXTURE_2D,
308                                      PIPE_TEXTURE_USAGE_SAMPLER, 0));
309   assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
310                                      PIPE_TEXTURE_USAGE_RENDER_TARGET, 0));
311
312   /* do the regions overlap? */
313   overlap = util_same_surface(src, dst) &&
314      regions_overlap(srcX0, srcY0, srcX1, srcY1,
315                      dstX0, dstY0, dstX1, dstY1);
316
317   /*
318    * Check for simple case:  no format conversion, no flipping, no stretching,
319    * no overlapping.
320    * Filter mode should not matter since there's no stretching.
321    */
322   if (pipe->surface_copy &&
323       dst->format == src->format &&
324       srcX0 < srcX1 &&
325       dstX0 < dstX1 &&
326       srcY0 < srcY1 &&
327       dstY0 < dstY1 &&
328       (dstX1 - dstX0) == (srcX1 - srcX0) &&
329       (dstY1 - dstY0) == (srcY1 - srcY0) &&
330       !overlap) {
331      pipe->surface_copy(pipe,
332			 dst, dstX0, dstY0, /* dest */
333			 src, srcX0, srcY0, /* src */
334			 srcW, srcH);       /* size */
335      return;
336   }
337
338   assert(screen->is_format_supported(screen, dst->format, PIPE_TEXTURE_2D,
339                                      PIPE_TEXTURE_USAGE_RENDER_TARGET, 0));
340
341   /* Create a temporary texture when src and dest alias or when src
342    * is anything other than a single-level 2d texture.
343    *
344    * This can still be improved upon.
345    */
346   if (util_same_surface(src, dst) ||
347       src->texture->target != PIPE_TEXTURE_2D ||
348       src->texture->last_level != 0)
349   {
350      struct pipe_texture texTemp;
351      struct pipe_sampler_view sv_templ;
352      struct pipe_surface *texSurf;
353      const int srcLeft = MIN2(srcX0, srcX1);
354      const int srcTop = MIN2(srcY0, srcY1);
355
356      if (srcLeft != srcX0) {
357         /* left-right flip */
358         int tmp = dstX0;
359         dstX0 = dstX1;
360         dstX1 = tmp;
361      }
362
363      if (srcTop != srcY0) {
364         /* up-down flip */
365         int tmp = dstY0;
366         dstY0 = dstY1;
367         dstY1 = tmp;
368      }
369
370      /* create temp texture */
371      memset(&texTemp, 0, sizeof(texTemp));
372      texTemp.target = PIPE_TEXTURE_2D;
373      texTemp.format = src->format;
374      texTemp.last_level = 0;
375      texTemp.width0 = srcW;
376      texTemp.height0 = srcH;
377      texTemp.depth0 = 1;
378
379      tex = screen->texture_create(screen, &texTemp);
380      if (!tex)
381         return;
382
383      u_sampler_view_default_template(&sv_templ, tex, tex->format);
384
385      sampler_view = ctx->pipe->create_sampler_view(ctx->pipe, tex, &sv_templ);
386      if (!sampler_view) {
387         pipe_texture_reference(&tex, NULL);
388         return;
389      }
390
391      texSurf = screen->get_tex_surface(screen, tex, 0, 0, 0,
392                                        PIPE_BUFFER_USAGE_GPU_WRITE);
393
394      /* load temp texture */
395      if (pipe->surface_copy) {
396         pipe->surface_copy(pipe,
397                            texSurf, 0, 0,   /* dest */
398                            src, srcLeft, srcTop, /* src */
399                            srcW, srcH);     /* size */
400      } else {
401         util_surface_copy(pipe, FALSE,
402                           texSurf, 0, 0,   /* dest */
403                           src, srcLeft, srcTop, /* src */
404                           srcW, srcH);     /* size */
405      }
406
407      /* free the surface, update the texture if necessary.
408       */
409      pipe_surface_reference(&texSurf, NULL);
410      s0 = 0.0f;
411      s1 = 1.0f;
412      t0 = 0.0f;
413      t1 = 1.0f;
414
415      pipe_texture_reference(&tex, NULL);
416   }
417   else {
418      pipe_sampler_view_reference(&sampler_view, src_sampler_view);
419      s0 = srcX0 / (float)tex->width0;
420      s1 = srcX1 / (float)tex->width0;
421      t0 = srcY0 / (float)tex->height0;
422      t1 = srcY1 / (float)tex->height0;
423   }
424
425
426
427   /* save state (restored below) */
428   cso_save_blend(ctx->cso);
429   cso_save_depth_stencil_alpha(ctx->cso);
430   cso_save_rasterizer(ctx->cso);
431   cso_save_samplers(ctx->cso);
432   cso_save_fragment_sampler_views(ctx->cso);
433   cso_save_viewport(ctx->cso);
434   cso_save_framebuffer(ctx->cso);
435   cso_save_fragment_shader(ctx->cso);
436   cso_save_vertex_shader(ctx->cso);
437   cso_save_clip(ctx->cso);
438   cso_save_vertex_elements(ctx->cso);
439
440   /* set misc state we care about */
441   cso_set_blend(ctx->cso, &ctx->blend);
442   cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
443   cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
444   cso_set_clip(ctx->cso, &ctx->clip);
445   cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
446
447   /* sampler */
448   ctx->sampler.min_img_filter = filter;
449   ctx->sampler.mag_img_filter = filter;
450   cso_single_sampler(ctx->cso, 0, &ctx->sampler);
451   cso_single_sampler_done(ctx->cso);
452
453   /* viewport */
454   ctx->viewport.scale[0] = 0.5f * dst->width;
455   ctx->viewport.scale[1] = 0.5f * dst->height;
456   ctx->viewport.scale[2] = 0.5f;
457   ctx->viewport.scale[3] = 1.0f;
458   ctx->viewport.translate[0] = 0.5f * dst->width;
459   ctx->viewport.translate[1] = 0.5f * dst->height;
460   ctx->viewport.translate[2] = 0.5f;
461   ctx->viewport.translate[3] = 0.0f;
462   cso_set_viewport(ctx->cso, &ctx->viewport);
463
464   /* texture */
465   cso_set_fragment_sampler_views(ctx->cso, 1, &sampler_view);
466
467   if (ctx->fs[writemask] == NULL)
468      ctx->fs[writemask] =
469         util_make_fragment_tex_shader_writemask(pipe, TGSI_TEXTURE_2D,
470                                                 writemask);
471
472   /* shaders */
473   cso_set_fragment_shader_handle(ctx->cso, ctx->fs[writemask]);
474   cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
475
476   /* drawing dest */
477   memset(&fb, 0, sizeof(fb));
478   fb.width = dst->width;
479   fb.height = dst->height;
480   fb.nr_cbufs = 1;
481   fb.cbufs[0] = dst;
482   cso_set_framebuffer(ctx->cso, &fb);
483
484   /* draw quad */
485   offset = setup_vertex_data_tex(ctx,
486                                  (float) dstX0 / dst->width * 2.0f - 1.0f,
487                                  (float) dstY0 / dst->height * 2.0f - 1.0f,
488                                  (float) dstX1 / dst->width * 2.0f - 1.0f,
489                                  (float) dstY1 / dst->height * 2.0f - 1.0f,
490                                  s0, t0,
491                                  s1, t1,
492                                  z);
493
494   util_draw_vertex_buffer(ctx->pipe, ctx->vbuf, offset,
495                           PIPE_PRIM_TRIANGLE_FAN,
496                           4,  /* verts */
497                           2); /* attribs/vert */
498
499   /* restore state we changed */
500   cso_restore_blend(ctx->cso);
501   cso_restore_depth_stencil_alpha(ctx->cso);
502   cso_restore_rasterizer(ctx->cso);
503   cso_restore_samplers(ctx->cso);
504   cso_restore_fragment_sampler_views(ctx->cso);
505   cso_restore_viewport(ctx->cso);
506   cso_restore_framebuffer(ctx->cso);
507   cso_restore_fragment_shader(ctx->cso);
508   cso_restore_vertex_shader(ctx->cso);
509   cso_restore_clip(ctx->cso);
510   cso_restore_vertex_elements(ctx->cso);
511
512   pipe_sampler_view_reference(&sampler_view, NULL);
513}
514
515
516void
517util_blit_pixels(struct blit_state *ctx,
518                 struct pipe_surface *src,
519                 struct pipe_sampler_view *src_sampler_view,
520                 int srcX0, int srcY0,
521                 int srcX1, int srcY1,
522                 struct pipe_surface *dst,
523                 int dstX0, int dstY0,
524                 int dstX1, int dstY1,
525                 float z, uint filter )
526{
527   util_blit_pixels_writemask( ctx, src, src_sampler_view,
528                               srcX0, srcY0,
529                               srcX1, srcY1,
530                               dst,
531                               dstX0, dstY0,
532                               dstX1, dstY1,
533                               z, filter,
534                               TGSI_WRITEMASK_XYZW );
535}
536
537
538/* Release vertex buffer at end of frame to avoid synchronous
539 * rendering.
540 */
541void util_blit_flush( struct blit_state *ctx )
542{
543   pipe_buffer_reference(&ctx->vbuf, NULL);
544   ctx->vbuf_slot = 0;
545}
546
547
548
549/**
550 * Copy pixel block from src texture to dst surface.
551 * Overlapping regions are acceptable.
552 *
553 * XXX Should support selection of level.
554 * XXX need some control over blitting Z and/or stencil.
555 */
556void
557util_blit_pixels_tex(struct blit_state *ctx,
558                 struct pipe_texture *tex,
559                 int srcX0, int srcY0,
560                 int srcX1, int srcY1,
561                 struct pipe_surface *dst,
562                 int dstX0, int dstY0,
563                 int dstX1, int dstY1,
564                 float z, uint filter)
565{
566   struct pipe_framebuffer_state fb;
567   float s0, t0, s1, t1;
568   unsigned offset;
569
570   assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
571          filter == PIPE_TEX_MIPFILTER_LINEAR);
572
573   assert(tex->width0 != 0);
574   assert(tex->height0 != 0);
575
576   s0 = srcX0 / (float)tex->width0;
577   s1 = srcX1 / (float)tex->width0;
578   t0 = srcY0 / (float)tex->height0;
579   t1 = srcY1 / (float)tex->height0;
580
581   assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
582                                                 PIPE_TEXTURE_2D,
583                                                 PIPE_TEXTURE_USAGE_RENDER_TARGET,
584                                                 0));
585
586   /* save state (restored below) */
587   cso_save_blend(ctx->cso);
588   cso_save_depth_stencil_alpha(ctx->cso);
589   cso_save_rasterizer(ctx->cso);
590   cso_save_samplers(ctx->cso);
591   cso_save_sampler_textures(ctx->cso);
592   cso_save_framebuffer(ctx->cso);
593   cso_save_fragment_shader(ctx->cso);
594   cso_save_vertex_shader(ctx->cso);
595   cso_save_clip(ctx->cso);
596   cso_save_vertex_elements(ctx->cso);
597
598   /* set misc state we care about */
599   cso_set_blend(ctx->cso, &ctx->blend);
600   cso_set_depth_stencil_alpha(ctx->cso, &ctx->depthstencil);
601   cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
602   cso_set_clip(ctx->cso, &ctx->clip);
603   cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
604
605   /* sampler */
606   ctx->sampler.min_img_filter = filter;
607   ctx->sampler.mag_img_filter = filter;
608   cso_single_sampler(ctx->cso, 0, &ctx->sampler);
609   cso_single_sampler_done(ctx->cso);
610
611   /* viewport */
612   ctx->viewport.scale[0] = 0.5f * dst->width;
613   ctx->viewport.scale[1] = 0.5f * dst->height;
614   ctx->viewport.scale[2] = 0.5f;
615   ctx->viewport.scale[3] = 1.0f;
616   ctx->viewport.translate[0] = 0.5f * dst->width;
617   ctx->viewport.translate[1] = 0.5f * dst->height;
618   ctx->viewport.translate[2] = 0.5f;
619   ctx->viewport.translate[3] = 0.0f;
620   cso_set_viewport(ctx->cso, &ctx->viewport);
621
622   /* texture */
623   cso_set_sampler_textures(ctx->cso, 1, &tex);
624
625   /* shaders */
626   cso_set_fragment_shader_handle(ctx->cso, ctx->fs[TGSI_WRITEMASK_XYZW]);
627   cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
628
629   /* drawing dest */
630   memset(&fb, 0, sizeof(fb));
631   fb.width = dst->width;
632   fb.height = dst->height;
633   fb.nr_cbufs = 1;
634   fb.cbufs[0] = dst;
635   cso_set_framebuffer(ctx->cso, &fb);
636
637   /* draw quad */
638   offset = setup_vertex_data_tex(ctx,
639                                  (float) dstX0 / dst->width * 2.0f - 1.0f,
640                                  (float) dstY0 / dst->height * 2.0f - 1.0f,
641                                  (float) dstX1 / dst->width * 2.0f - 1.0f,
642                                  (float) dstY1 / dst->height * 2.0f - 1.0f,
643                                  s0, t0, s1, t1,
644                                  z);
645
646   util_draw_vertex_buffer(ctx->pipe,
647                           ctx->vbuf, offset,
648                           PIPE_PRIM_TRIANGLE_FAN,
649                           4,  /* verts */
650                           2); /* attribs/vert */
651
652   /* restore state we changed */
653   cso_restore_blend(ctx->cso);
654   cso_restore_depth_stencil_alpha(ctx->cso);
655   cso_restore_rasterizer(ctx->cso);
656   cso_restore_samplers(ctx->cso);
657   cso_restore_sampler_textures(ctx->cso);
658   cso_restore_framebuffer(ctx->cso);
659   cso_restore_fragment_shader(ctx->cso);
660   cso_restore_vertex_shader(ctx->cso);
661   cso_restore_clip(ctx->cso);
662   cso_restore_vertex_elements(ctx->cso);
663}
664