aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/gallium/auxiliary/util/u_blit.c
blob: 9fe15b8108a7c4b0cd62d4c92c2d0b1a6220f69c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
/**************************************************************************
 *
 * Copyright 2008 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.
 *
 **************************************************************************/

/**
 * @file
 * Copy/blit pixel rect between surfaces
 *  
 * @author Brian Paul
 */


#include "pipe/p_context.h"
#include "util/u_debug.h"
#include "pipe/p_defines.h"
#include "util/u_inlines.h"
#include "pipe/p_shader_tokens.h"
#include "pipe/p_state.h"

#include "util/u_blit.h"
#include "util/u_draw_quad.h"
#include "util/u_format.h"
#include "util/u_math.h"
#include "util/u_memory.h"
#include "util/u_sampler.h"
#include "util/u_simple_shaders.h"

#include "cso_cache/cso_context.h"


struct blit_state
{
   struct pipe_context *pipe;
   struct cso_context *cso;

   struct pipe_blend_state blend_write_color, blend_keep_color;
   struct pipe_depth_stencil_alpha_state dsa_keep_depthstencil;
   struct pipe_depth_stencil_alpha_state dsa_write_depthstencil;
   struct pipe_depth_stencil_alpha_state dsa_write_depth;
   struct pipe_depth_stencil_alpha_state dsa_write_stencil;
   struct pipe_rasterizer_state rasterizer;
   struct pipe_sampler_state sampler;
   struct pipe_viewport_state viewport;
   struct pipe_vertex_element velem[2];
   enum pipe_texture_target internal_target;

   void *vs;
   void *fs[PIPE_MAX_TEXTURE_TYPES][TGSI_WRITEMASK_XYZW + 1];
   void *fs_depthstencil[PIPE_MAX_TEXTURE_TYPES];
   void *fs_depth[PIPE_MAX_TEXTURE_TYPES];
   void *fs_stencil[PIPE_MAX_TEXTURE_TYPES];

   struct pipe_resource *vbuf;  /**< quad vertices */
   unsigned vbuf_slot;

   float vertices[4][2][4];   /**< vertex/texcoords for quad */

   boolean has_stencil_export;
};


/**
 * Create state object for blit.
 * Intended to be created once and re-used for many blit() calls.
 */
struct blit_state *
util_create_blit(struct pipe_context *pipe, struct cso_context *cso)
{
   struct blit_state *ctx;
   uint i;

   ctx = CALLOC_STRUCT(blit_state);
   if (!ctx)
      return NULL;

   ctx->pipe = pipe;
   ctx->cso = cso;

   /* disabled blending/masking */
   ctx->blend_write_color.rt[0].colormask = PIPE_MASK_RGBA;

   /* depth stencil states */
   ctx->dsa_write_depth.depth.enabled = 1;
   ctx->dsa_write_depth.depth.writemask = 1;
   ctx->dsa_write_depth.depth.func = PIPE_FUNC_ALWAYS;
   ctx->dsa_write_stencil.stencil[0].enabled = 1;
   ctx->dsa_write_stencil.stencil[0].func = PIPE_FUNC_ALWAYS;
   ctx->dsa_write_stencil.stencil[0].fail_op = PIPE_STENCIL_OP_REPLACE;
   ctx->dsa_write_stencil.stencil[0].zpass_op = PIPE_STENCIL_OP_REPLACE;
   ctx->dsa_write_stencil.stencil[0].zfail_op = PIPE_STENCIL_OP_REPLACE;
   ctx->dsa_write_stencil.stencil[0].valuemask = 0xff;
   ctx->dsa_write_stencil.stencil[0].writemask = 0xff;
   ctx->dsa_write_depthstencil.depth = ctx->dsa_write_depth.depth;
   ctx->dsa_write_depthstencil.stencil[0] = ctx->dsa_write_stencil.stencil[0];

   /* rasterizer */
   ctx->rasterizer.cull_face = PIPE_FACE_NONE;
   ctx->rasterizer.gl_rasterization_rules = 1;
   ctx->rasterizer.depth_clip = 1;

   /* samplers */
   ctx->sampler.wrap_s = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   ctx->sampler.wrap_t = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   ctx->sampler.wrap_r = PIPE_TEX_WRAP_CLAMP_TO_EDGE;
   ctx->sampler.min_mip_filter = PIPE_TEX_MIPFILTER_NONE;
   ctx->sampler.min_img_filter = 0; /* set later */
   ctx->sampler.mag_img_filter = 0; /* set later */

   /* vertex elements state */
   for (i = 0; i < 2; i++) {
      ctx->velem[i].src_offset = i * 4 * sizeof(float);
      ctx->velem[i].instance_divisor = 0;
      ctx->velem[i].vertex_buffer_index = cso_get_aux_vertex_buffer_slot(cso);
      ctx->velem[i].src_format = PIPE_FORMAT_R32G32B32A32_FLOAT;
   }

   ctx->vbuf = NULL;

   /* init vertex data that doesn't change */
   for (i = 0; i < 4; i++) {
      ctx->vertices[i][0][3] = 1.0f; /* w */
      ctx->vertices[i][1][2] = 0.0f; /* r */
      ctx->vertices[i][1][3] = 1.0f; /* q */
   }

   if(pipe->screen->get_param(pipe->screen, PIPE_CAP_NPOT_TEXTURES))
      ctx->internal_target = PIPE_TEXTURE_2D;
   else
      ctx->internal_target = PIPE_TEXTURE_RECT;

   ctx->has_stencil_export =
      pipe->screen->get_param(pipe->screen, PIPE_CAP_SHADER_STENCIL_EXPORT);

   return ctx;
}


/**
 * Destroy a blit context
 */
void
util_destroy_blit(struct blit_state *ctx)
{
   struct pipe_context *pipe = ctx->pipe;
   unsigned i, j;

   if (ctx->vs)
      pipe->delete_vs_state(pipe, ctx->vs);

   for (i = 0; i < Elements(ctx->fs); i++) {
      for (j = 0; j < Elements(ctx->fs[i]); j++) {
         if (ctx->fs[i][j])
            pipe->delete_fs_state(pipe, ctx->fs[i][j]);
      }
   }

   for (i = 0; i < PIPE_MAX_TEXTURE_TYPES; i++) {
      if (ctx->fs_depthstencil[i]) {
         pipe->delete_fs_state(pipe, ctx->fs_depthstencil[i]);
      }
      if (ctx->fs_depth[i]) {
         pipe->delete_fs_state(pipe, ctx->fs_depth[i]);
      }
      if (ctx->fs_stencil[i]) {
         pipe->delete_fs_state(pipe, ctx->fs_stencil[i]);
      }
   }

   pipe_resource_reference(&ctx->vbuf, NULL);

   FREE(ctx);
}


/**
 * Helper function to set the fragment shaders.
 */
static INLINE void
set_fragment_shader(struct blit_state *ctx, uint writemask,
                    enum pipe_texture_target pipe_tex)
{
   if (!ctx->fs[pipe_tex][writemask]) {
      unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);

      ctx->fs[pipe_tex][writemask] =
         util_make_fragment_tex_shader_writemask(ctx->pipe, tgsi_tex,
                                                 TGSI_INTERPOLATE_LINEAR,
                                                 writemask);
   }

   cso_set_fragment_shader_handle(ctx->cso, ctx->fs[pipe_tex][writemask]);
}


/**
 * Helper function to set the shader which writes depth and stencil.
 */
static INLINE void
set_depthstencil_fragment_shader(struct blit_state *ctx,
                                 enum pipe_texture_target pipe_tex)
{
   if (!ctx->fs_depthstencil[pipe_tex]) {
      unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);

      ctx->fs_depthstencil[pipe_tex] =
         util_make_fragment_tex_shader_writedepthstencil(ctx->pipe, tgsi_tex,
                                                  TGSI_INTERPOLATE_LINEAR);
   }

   cso_set_fragment_shader_handle(ctx->cso, ctx->fs_depthstencil[pipe_tex]);
}


/**
 * Helper function to set the shader which writes depth.
 */
static INLINE void
set_depth_fragment_shader(struct blit_state *ctx,
                          enum pipe_texture_target pipe_tex)
{
   if (!ctx->fs_depth[pipe_tex]) {
      unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);

      ctx->fs_depth[pipe_tex] =
         util_make_fragment_tex_shader_writedepth(ctx->pipe, tgsi_tex,
                                                  TGSI_INTERPOLATE_LINEAR);
   }

   cso_set_fragment_shader_handle(ctx->cso, ctx->fs_depth[pipe_tex]);
}


/**
 * Helper function to set the shader which writes stencil.
 */
static INLINE void
set_stencil_fragment_shader(struct blit_state *ctx,
                            enum pipe_texture_target pipe_tex)
{
   if (!ctx->fs_stencil[pipe_tex]) {
      unsigned tgsi_tex = util_pipe_tex_to_tgsi_tex(pipe_tex, 0);

      ctx->fs_stencil[pipe_tex] =
         util_make_fragment_tex_shader_writestencil(ctx->pipe, tgsi_tex,
                                                    TGSI_INTERPOLATE_LINEAR);
   }

   cso_set_fragment_shader_handle(ctx->cso, ctx->fs_stencil[pipe_tex]);
}


/**
 * Helper function to set the vertex shader.
 */
static INLINE void
set_vertex_shader(struct blit_state *ctx)
{
   /* vertex shader - still required to provide the linkage between
    * fragment shader input semantics and vertex_element/buffers.
    */
   if (!ctx->vs) {
      const uint semantic_names[] = { TGSI_SEMANTIC_POSITION,
                                      TGSI_SEMANTIC_GENERIC };
      const uint semantic_indexes[] = { 0, 0 };
      ctx->vs = util_make_vertex_passthrough_shader(ctx->pipe, 2,
                                                    semantic_names,
                                                    semantic_indexes);
   }

   cso_set_vertex_shader_handle(ctx->cso, ctx->vs);
}


/**
 * Get offset of next free slot in vertex buffer for quad vertices.
 */
static unsigned
get_next_slot( struct blit_state *ctx )
{
   const unsigned max_slots = 4096 / sizeof ctx->vertices;

   if (ctx->vbuf_slot >= max_slots) {
      pipe_resource_reference(&ctx->vbuf, NULL);
      ctx->vbuf_slot = 0;
   }

   if (!ctx->vbuf) {
      ctx->vbuf = pipe_buffer_create(ctx->pipe->screen,
                                     PIPE_BIND_VERTEX_BUFFER,
                                     PIPE_USAGE_STREAM,
                                     max_slots * sizeof ctx->vertices);
   }
   
   return ctx->vbuf_slot++ * sizeof ctx->vertices;
}




/**
 * Setup vertex data for the textured quad we'll draw.
 * Note: y=0=top
 */
static unsigned
setup_vertex_data_tex(struct blit_state *ctx,
                      float x0, float y0, float x1, float y1,
                      float s0, float t0, float s1, float t1,
                      float z)
{
   unsigned offset;

   ctx->vertices[0][0][0] = x0;
   ctx->vertices[0][0][1] = y0;
   ctx->vertices[0][0][2] = z;
   ctx->vertices[0][1][0] = s0; /*s*/
   ctx->vertices[0][1][1] = t0; /*t*/

   ctx->vertices[1][0][0] = x1;
   ctx->vertices[1][0][1] = y0;
   ctx->vertices[1][0][2] = z;
   ctx->vertices[1][1][0] = s1; /*s*/
   ctx->vertices[1][1][1] = t0; /*t*/

   ctx->vertices[2][0][0] = x1;
   ctx->vertices[2][0][1] = y1;
   ctx->vertices[2][0][2] = z;
   ctx->vertices[2][1][0] = s1;
   ctx->vertices[2][1][1] = t1;

   ctx->vertices[3][0][0] = x0;
   ctx->vertices[3][0][1] = y1;
   ctx->vertices[3][0][2] = z;
   ctx->vertices[3][1][0] = s0;
   ctx->vertices[3][1][1] = t1;

   offset = get_next_slot( ctx );

   if (ctx->vbuf) {
      pipe_buffer_write_nooverlap(ctx->pipe, ctx->vbuf,
                                  offset, sizeof(ctx->vertices), ctx->vertices);
   }

   return offset;
}


/**
 * \return TRUE if two regions overlap, FALSE otherwise
 */
static boolean
regions_overlap(int srcX0, int srcY0,
                int srcX1, int srcY1,
                int dstX0, int dstY0,
                int dstX1, int dstY1)
{
   if (MAX2(srcX0, srcX1) < MIN2(dstX0, dstX1))
      return FALSE; /* src completely left of dst */

   if (MAX2(dstX0, dstX1) < MIN2(srcX0, srcX1))
      return FALSE; /* dst completely left of src */

   if (MAX2(srcY0, srcY1) < MIN2(dstY0, dstY1))
      return FALSE; /* src completely above dst */

   if (MAX2(dstY0, dstY1) < MIN2(srcY0, srcY1))
      return FALSE; /* dst completely above src */

   return TRUE; /* some overlap */
}


/**
 * Can we blit from src format to dest format with a simple copy?
 */
static boolean
formats_compatible(enum pipe_format src_format,
                   enum pipe_format dst_format)
{
   if (src_format == dst_format) {
      return TRUE;
   }
   else {
      const struct util_format_description *src_desc =
         util_format_description(src_format);
      const struct util_format_description *dst_desc =
         util_format_description(dst_format);
      return util_is_format_compatible(src_desc, dst_desc);
   }
}


/**
 * Copy pixel block from src surface to dst surface.
 * Overlapping regions are acceptable.
 * Flipping and stretching are supported.
 * \param filter  one of PIPE_TEX_MIPFILTER_NEAREST/LINEAR
 * \param writemask  controls which channels in the dest surface are sourced
 *                   from the src surface.  Disabled channels are sourced
 *                   from (0,0,0,1).
 */
void
util_blit_pixels(struct blit_state *ctx,
                 struct pipe_resource *src_tex,
                 unsigned src_level,
                 int srcX0, int srcY0,
                 int srcX1, int srcY1,
                 int srcZ0,
                 struct pipe_surface *dst,
                 int dstX0, int dstY0,
                 int dstX1, int dstY1,
                 float z, uint filter,
                 uint writemask, uint zs_writemask)
{
   struct pipe_context *pipe = ctx->pipe;
   struct pipe_screen *screen = pipe->screen;
   enum pipe_format src_format, dst_format;
   struct pipe_sampler_view *sampler_view = NULL;
   struct pipe_sampler_view sv_templ;
   struct pipe_surface *dst_surface;
   struct pipe_framebuffer_state fb;
   const int srcW = abs(srcX1 - srcX0);
   const int srcH = abs(srcY1 - srcY0);
   unsigned offset;
   boolean overlap;
   float s0, t0, s1, t1;
   boolean normalized;
   boolean is_stencil, is_depth, blit_depth, blit_stencil;
   const struct util_format_description *src_desc =
         util_format_description(src_tex->format);

   assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
          filter == PIPE_TEX_MIPFILTER_LINEAR);

   assert(src_level <= src_tex->last_level);

   /* do the regions overlap? */
   overlap = src_tex == dst->texture &&
             dst->u.tex.level == src_level &&
             dst->u.tex.first_layer == srcZ0 &&
      regions_overlap(srcX0, srcY0, srcX1, srcY1,
                      dstX0, dstY0, dstX1, dstY1);

   src_format = util_format_linear(src_tex->format);
   dst_format = util_format_linear(dst->texture->format);

   /* See whether we will blit depth or stencil. */
   is_depth = util_format_has_depth(src_desc);
   is_stencil = util_format_has_stencil(src_desc);

   blit_depth = is_depth && (zs_writemask & BLIT_WRITEMASK_Z);
   blit_stencil = is_stencil && (zs_writemask & BLIT_WRITEMASK_STENCIL);

   assert((writemask && !zs_writemask && !is_depth && !is_stencil) ||
          (!writemask && (blit_depth || blit_stencil)));

   /*
    * Check for simple case:  no format conversion, no flipping, no stretching,
    * no overlapping, same number of samples.
    * Filter mode should not matter since there's no stretching.
    */
   if (formats_compatible(src_format, dst_format) &&
       src_tex->nr_samples == dst->texture->nr_samples &&
       is_stencil == blit_stencil &&
       is_depth == blit_depth &&
       srcX0 < srcX1 &&
       dstX0 < dstX1 &&
       srcY0 < srcY1 &&
       dstY0 < dstY1 &&
       (dstX1 - dstX0) == (srcX1 - srcX0) &&
       (dstY1 - dstY0) == (srcY1 - srcY0) &&
       !overlap) {
      struct pipe_box src_box;
      src_box.x = srcX0;
      src_box.y = srcY0;
      src_box.z = srcZ0;
      src_box.width = srcW;
      src_box.height = srcH;
      src_box.depth = 1;
      pipe->resource_copy_region(pipe,
                                 dst->texture, dst->u.tex.level,
                                 dstX0, dstY0, dst->u.tex.first_layer,/* dest */
                                 src_tex, src_level,
                                 &src_box);
      return;
   }

   /* XXX Reading multisample textures is unimplemented. */
   assert(src_tex->nr_samples <= 1);
   if (src_tex->nr_samples > 1) {
      return;
   }

   /* It's a mistake to call this function with a stencil format and
    * without shader stencil export. We don't do software fallbacks here.
    * Ignore stencil and only copy depth.
    */
   if (blit_stencil && !ctx->has_stencil_export) {
      blit_stencil = FALSE;

      if (!blit_depth)
         return;
   }

   if (dst_format == dst->format) {
      dst_surface = dst;
   } else {
      struct pipe_surface templ = *dst;
      templ.format = dst_format;
      dst_surface = pipe->create_surface(pipe, dst->texture, &templ);
   }

   /* Create a temporary texture when src and dest alias.
    */
   if (src_tex == dst_surface->texture &&
       dst_surface->u.tex.level == src_level &&
       dst_surface->u.tex.first_layer == srcZ0) {
      /* Make a temporary texture which contains a copy of the source pixels.
       * Then we'll sample from the temporary texture.
       */
      struct pipe_resource texTemp;
      struct pipe_resource *tex;
      struct pipe_sampler_view sv_templ;
      struct pipe_box src_box;
      const int srcLeft = MIN2(srcX0, srcX1);
      const int srcTop = MIN2(srcY0, srcY1);

      if (srcLeft != srcX0) {
         /* left-right flip */
         int tmp = dstX0;
         dstX0 = dstX1;
         dstX1 = tmp;
      }

      if (srcTop != srcY0) {
         /* up-down flip */
         int tmp = dstY0;
         dstY0 = dstY1;
         dstY1 = tmp;
      }

      /* create temp texture */
      memset(&texTemp, 0, sizeof(texTemp));
      texTemp.target = ctx->internal_target;
      texTemp.format = src_format;
      texTemp.last_level = 0;
      texTemp.width0 = srcW;
      texTemp.height0 = srcH;
      texTemp.depth0 = 1;
      texTemp.array_size = 1;
      texTemp.bind = PIPE_BIND_SAMPLER_VIEW;

      tex = screen->resource_create(screen, &texTemp);
      if (!tex)
         return;

      src_box.x = srcLeft;
      src_box.y = srcTop;
      src_box.z = srcZ0;
      src_box.width = srcW;
      src_box.height = srcH;
      src_box.depth = 1;
      /* load temp texture */
      pipe->resource_copy_region(pipe,
                                 tex, 0, 0, 0, 0,  /* dest */
                                 src_tex, src_level, &src_box);

      normalized = tex->target != PIPE_TEXTURE_RECT;
      if(normalized) {
         s0 = 0.0f;
         s1 = 1.0f;
         t0 = 0.0f;
         t1 = 1.0f;
      }
      else {
         s0 = 0;
         s1 = srcW;
         t0 = 0;
         t1 = srcH;
      }

      u_sampler_view_default_template(&sv_templ, tex, tex->format);
      if (!blit_depth && blit_stencil) {
         /* set a stencil-only format, e.g. Z24S8 --> X24S8 */
         sv_templ.format = util_format_stencil_only(tex->format);
         assert(sv_templ.format != PIPE_FORMAT_NONE);
      }
      sampler_view = pipe->create_sampler_view(pipe, tex, &sv_templ);

      if (!sampler_view) {
         pipe_resource_reference(&tex, NULL);
         return;
      }
      pipe_resource_reference(&tex, NULL);
   }
   else {
      /* Directly sample from the source resource/texture */
      u_sampler_view_default_template(&sv_templ, src_tex, src_format);
      if (!blit_depth && blit_stencil) {
         /* set a stencil-only format, e.g. Z24S8 --> X24S8 */
         sv_templ.format = util_format_stencil_only(src_format);
         assert(sv_templ.format != PIPE_FORMAT_NONE);
      }
      sampler_view = pipe->create_sampler_view(pipe, src_tex, &sv_templ);

      if (!sampler_view) {
         return;
      }

      s0 = srcX0;
      s1 = srcX1;
      t0 = srcY0;
      t1 = srcY1;
      normalized = sampler_view->texture->target != PIPE_TEXTURE_RECT;
      if(normalized)
      {
         s0 /= (float)(u_minify(sampler_view->texture->width0, src_level));
         s1 /= (float)(u_minify(sampler_view->texture->width0, src_level));
         t0 /= (float)(u_minify(sampler_view->texture->height0, src_level));
         t1 /= (float)(u_minify(sampler_view->texture->height0, src_level));
      }
   }

   assert(screen->is_format_supported(screen, sampler_view->format,
                     ctx->internal_target, sampler_view->texture->nr_samples,
                     PIPE_BIND_SAMPLER_VIEW));
   assert(screen->is_format_supported(screen, dst_format, ctx->internal_target,
                     dst_surface->texture->nr_samples,
                     is_depth || is_stencil ? PIPE_BIND_DEPTH_STENCIL :
                                              PIPE_BIND_RENDER_TARGET));

   /* save state (restored below) */
   cso_save_blend(ctx->cso);
   cso_save_depth_stencil_alpha(ctx->cso);
   cso_save_rasterizer(ctx->cso);
   cso_save_sample_mask(ctx->cso);
   cso_save_samplers(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_save_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_save_stream_outputs(ctx->cso);
   cso_save_viewport(ctx->cso);
   cso_save_framebuffer(ctx->cso);
   cso_save_fragment_shader(ctx->cso);
   cso_save_vertex_shader(ctx->cso);
   cso_save_geometry_shader(ctx->cso);
   cso_save_vertex_elements(ctx->cso);
   cso_save_aux_vertex_buffer_slot(ctx->cso);
   cso_save_render_condition(ctx->cso);

   /* set misc state we care about */
   if (writemask)
      cso_set_blend(ctx->cso, &ctx->blend_write_color);
   else
      cso_set_blend(ctx->cso, &ctx->blend_keep_color);

   cso_set_sample_mask(ctx->cso, ~0);
   cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
   cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
   cso_set_stream_outputs(ctx->cso, 0, NULL, 0);
   cso_set_render_condition(ctx->cso, NULL, 0);

   /* default sampler state */
   ctx->sampler.normalized_coords = normalized;
   ctx->sampler.min_img_filter = filter;
   ctx->sampler.mag_img_filter = filter;
   ctx->sampler.min_lod = src_level;
   ctx->sampler.max_lod = src_level;

   /* Depth stencil state, fragment shader and sampler setup depending on what
    * we blit.
    */
   if (blit_depth && blit_stencil) {
      cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 0, &ctx->sampler);
      /* don't filter stencil */
      ctx->sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
      ctx->sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
      cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &ctx->sampler);

      cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_write_depthstencil);
      set_depthstencil_fragment_shader(ctx, sampler_view->texture->target);
   }
   else if (blit_depth) {
      cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 0, &ctx->sampler);
      cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_write_depth);
      set_depth_fragment_shader(ctx, sampler_view->texture->target);
   }
   else if (blit_stencil) {
      /* don't filter stencil */
      ctx->sampler.min_img_filter = PIPE_TEX_FILTER_NEAREST;
      ctx->sampler.mag_img_filter = PIPE_TEX_FILTER_NEAREST;
      cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 0, &ctx->sampler);

      cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_write_stencil);
      set_stencil_fragment_shader(ctx, sampler_view->texture->target);
   }
   else { /* color */
      cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 0, &ctx->sampler);
      cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_keep_depthstencil);
      set_fragment_shader(ctx, writemask, sampler_view->texture->target);
   }
   cso_single_sampler_done(ctx->cso, PIPE_SHADER_FRAGMENT);

   /* textures */
   if (blit_depth && blit_stencil) {
      /* Setup two samplers, one for depth and the other one for stencil. */
      struct pipe_sampler_view templ;
      struct pipe_sampler_view *views[2];

      templ = *sampler_view;
      templ.format = util_format_stencil_only(templ.format);
      assert(templ.format != PIPE_FORMAT_NONE);

      views[0] = sampler_view;
      views[1] = pipe->create_sampler_view(pipe, views[0]->texture, &templ);
      cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 2, views);

      pipe_sampler_view_reference(&views[1], NULL);
   }
   else {
      cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &sampler_view);
   }

   /* viewport */
   ctx->viewport.scale[0] = 0.5f * dst_surface->width;
   ctx->viewport.scale[1] = 0.5f * dst_surface->height;
   ctx->viewport.scale[2] = 0.5f;
   ctx->viewport.scale[3] = 1.0f;
   ctx->viewport.translate[0] = 0.5f * dst_surface->width;
   ctx->viewport.translate[1] = 0.5f * dst_surface->height;
   ctx->viewport.translate[2] = 0.5f;
   ctx->viewport.translate[3] = 0.0f;
   cso_set_viewport(ctx->cso, &ctx->viewport);

   set_vertex_shader(ctx);
   cso_set_geometry_shader_handle(ctx->cso, NULL);

   /* drawing dest */
   memset(&fb, 0, sizeof(fb));
   fb.width = dst_surface->width;
   fb.height = dst_surface->height;
   if (blit_depth || blit_stencil) {
      fb.zsbuf = dst_surface;
   } else {
      fb.nr_cbufs = 1;
      fb.cbufs[0] = dst_surface;
   }
   cso_set_framebuffer(ctx->cso, &fb);

   /* draw quad */
   offset = setup_vertex_data_tex(ctx,
                                  (float) dstX0 / dst_surface->width * 2.0f - 1.0f,
                                  (float) dstY0 / dst_surface->height * 2.0f - 1.0f,
                                  (float) dstX1 / dst_surface->width * 2.0f - 1.0f,
                                  (float) dstY1 / dst_surface->height * 2.0f - 1.0f,
                                  s0, t0,
                                  s1, t1,
                                  z);

   if (ctx->vbuf) {
      util_draw_vertex_buffer(ctx->pipe, ctx->cso, ctx->vbuf,
                              cso_get_aux_vertex_buffer_slot(ctx->cso),
                              offset,
                              PIPE_PRIM_TRIANGLE_FAN,
                              4,  /* verts */
                              2); /* attribs/vert */
   }

   /* restore state we changed */
   cso_restore_blend(ctx->cso);
   cso_restore_depth_stencil_alpha(ctx->cso);
   cso_restore_rasterizer(ctx->cso);
   cso_restore_sample_mask(ctx->cso);
   cso_restore_samplers(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_restore_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_restore_viewport(ctx->cso);
   cso_restore_framebuffer(ctx->cso);
   cso_restore_fragment_shader(ctx->cso);
   cso_restore_vertex_shader(ctx->cso);
   cso_restore_geometry_shader(ctx->cso);
   cso_restore_vertex_elements(ctx->cso);
   cso_restore_aux_vertex_buffer_slot(ctx->cso);
   cso_restore_stream_outputs(ctx->cso);
   cso_restore_render_condition(ctx->cso);

   pipe_sampler_view_reference(&sampler_view, NULL);
   if (dst_surface != dst)
      pipe_surface_reference(&dst_surface, NULL);
}


/**
 * Copy pixel block from src texture to dst surface.
 * The sampler view's first_level field indicates the source
 * mipmap level to use.
 * XXX need some control over blitting Z and/or stencil.
 */
void
util_blit_pixels_tex(struct blit_state *ctx,
                     struct pipe_sampler_view *src_sampler_view,
                     int srcX0, int srcY0,
                     int srcX1, int srcY1,
                     struct pipe_surface *dst,
                     int dstX0, int dstY0,
                     int dstX1, int dstY1,
                     float z, uint filter)
{
   boolean normalized = src_sampler_view->texture->target != PIPE_TEXTURE_RECT;
   struct pipe_framebuffer_state fb;
   float s0, t0, s1, t1;
   unsigned offset;
   struct pipe_resource *tex = src_sampler_view->texture;

   assert(filter == PIPE_TEX_MIPFILTER_NEAREST ||
          filter == PIPE_TEX_MIPFILTER_LINEAR);

   assert(tex);
   assert(tex->width0 != 0);
   assert(tex->height0 != 0);

   s0 = srcX0;
   s1 = srcX1;
   t0 = srcY0;
   t1 = srcY1;

   if(normalized)
   {
      /* normalize according to the mipmap level's size */
      int level = src_sampler_view->u.tex.first_level;
      float w = (float) u_minify(tex->width0, level);
      float h = (float) u_minify(tex->height0, level);
      s0 /= w;
      s1 /= w;
      t0 /= h;
      t1 /= h;
   }

   assert(ctx->pipe->screen->is_format_supported(ctx->pipe->screen, dst->format,
                                                 PIPE_TEXTURE_2D,
                                                 dst->texture->nr_samples,
                                                 PIPE_BIND_RENDER_TARGET));

   /* save state (restored below) */
   cso_save_blend(ctx->cso);
   cso_save_depth_stencil_alpha(ctx->cso);
   cso_save_rasterizer(ctx->cso);
   cso_save_sample_mask(ctx->cso);
   cso_save_samplers(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_save_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_save_stream_outputs(ctx->cso);
   cso_save_viewport(ctx->cso);
   cso_save_framebuffer(ctx->cso);
   cso_save_fragment_shader(ctx->cso);
   cso_save_vertex_shader(ctx->cso);
   cso_save_geometry_shader(ctx->cso);
   cso_save_vertex_elements(ctx->cso);
   cso_save_aux_vertex_buffer_slot(ctx->cso);

   /* set misc state we care about */
   cso_set_blend(ctx->cso, &ctx->blend_write_color);
   cso_set_depth_stencil_alpha(ctx->cso, &ctx->dsa_keep_depthstencil);
   cso_set_sample_mask(ctx->cso, ~0);
   cso_set_rasterizer(ctx->cso, &ctx->rasterizer);
   cso_set_vertex_elements(ctx->cso, 2, ctx->velem);
   cso_set_stream_outputs(ctx->cso, 0, NULL, 0);

   /* sampler */
   ctx->sampler.normalized_coords = normalized;
   ctx->sampler.min_img_filter = filter;
   ctx->sampler.mag_img_filter = filter;
   cso_single_sampler(ctx->cso, PIPE_SHADER_FRAGMENT, 0, &ctx->sampler);
   cso_single_sampler_done(ctx->cso, PIPE_SHADER_FRAGMENT);

   /* viewport */
   ctx->viewport.scale[0] = 0.5f * dst->width;
   ctx->viewport.scale[1] = 0.5f * dst->height;
   ctx->viewport.scale[2] = 0.5f;
   ctx->viewport.scale[3] = 1.0f;
   ctx->viewport.translate[0] = 0.5f * dst->width;
   ctx->viewport.translate[1] = 0.5f * dst->height;
   ctx->viewport.translate[2] = 0.5f;
   ctx->viewport.translate[3] = 0.0f;
   cso_set_viewport(ctx->cso, &ctx->viewport);

   /* texture */
   cso_set_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT, 1, &src_sampler_view);

   /* shaders */
   set_fragment_shader(ctx, TGSI_WRITEMASK_XYZW,
                       src_sampler_view->texture->target);
   set_vertex_shader(ctx);
   cso_set_geometry_shader_handle(ctx->cso, NULL);

   /* drawing dest */
   memset(&fb, 0, sizeof(fb));
   fb.width = dst->width;
   fb.height = dst->height;
   fb.nr_cbufs = 1;
   fb.cbufs[0] = dst;
   cso_set_framebuffer(ctx->cso, &fb);

   /* draw quad */
   offset = setup_vertex_data_tex(ctx,
                                  (float) dstX0 / dst->width * 2.0f - 1.0f,
                                  (float) dstY0 / dst->height * 2.0f - 1.0f,
                                  (float) dstX1 / dst->width * 2.0f - 1.0f,
                                  (float) dstY1 / dst->height * 2.0f - 1.0f,
                                  s0, t0, s1, t1,
                                  z);

   util_draw_vertex_buffer(ctx->pipe, ctx->cso, ctx->vbuf,
                           cso_get_aux_vertex_buffer_slot(ctx->cso),
                           offset,
                           PIPE_PRIM_TRIANGLE_FAN,
                           4,  /* verts */
                           2); /* attribs/vert */

   /* restore state we changed */
   cso_restore_blend(ctx->cso);
   cso_restore_depth_stencil_alpha(ctx->cso);
   cso_restore_rasterizer(ctx->cso);
   cso_restore_sample_mask(ctx->cso);
   cso_restore_samplers(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_restore_sampler_views(ctx->cso, PIPE_SHADER_FRAGMENT);
   cso_restore_viewport(ctx->cso);
   cso_restore_framebuffer(ctx->cso);
   cso_restore_fragment_shader(ctx->cso);
   cso_restore_vertex_shader(ctx->cso);
   cso_restore_geometry_shader(ctx->cso);
   cso_restore_vertex_elements(ctx->cso);
   cso_restore_aux_vertex_buffer_slot(ctx->cso);
   cso_restore_stream_outputs(ctx->cso);
}