summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/i915/i830_metaops.c
blob: c1d7fe349c063f7b27384187846eb02bdf4e81b8 (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
/**************************************************************************
 * 
 * Copyright 2003 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.
 * 
 **************************************************************************/

#include "glheader.h"
#include "enums.h"
#include "mtypes.h"
#include "macros.h"
#include "utils.h"

#include "intel_screen.h"
#include "intel_batchbuffer.h"
#include "intel_ioctl.h"

#include "i830_context.h"
#include "i830_reg.h"

/* A large amount of state doesn't need to be uploaded.
 */
#define ACTIVE (I830_UPLOAD_INVARIENT |         \
		I830_UPLOAD_TEXBLEND(0) |	\
		I830_UPLOAD_STIPPLE |		\
		I830_UPLOAD_CTX |		\
		I830_UPLOAD_BUFFERS |		\
		I830_UPLOAD_TEX(0))		


#define SET_STATE( i830, STATE )		\
do {						\
   i830->current->emitted = 0;			\
   i830->current = &i830->STATE;		\
   i830->current->emitted = 0;			\
} while (0)

/* Operations where the 3D engine is decoupled temporarily from the
 * current GL state and used for other purposes than simply rendering
 * incoming triangles.
 */
static void set_initial_state( i830ContextPtr i830 )
{
   memcpy(&i830->meta, &i830->initial, sizeof(i830->meta) );
   i830->meta.active = ACTIVE;
   i830->meta.emitted = 0;
}


static void set_no_depth_stencil_write( i830ContextPtr i830 )
{
   /* ctx->Driver.Enable( ctx, GL_STENCIL_TEST, GL_FALSE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_STENCIL_WRITE;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_STENCIL_WRITE;


   /* ctx->Driver.Enable( ctx, GL_DEPTH_TEST, GL_FALSE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_DEPTH_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_DIS_DEPTH_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_DEPTH_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_DEPTH_WRITE;

   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}

/* Set stencil unit to replace always with the reference value.
 */
static void set_stencil_replace( i830ContextPtr i830,
				 GLuint s_mask,
				 GLuint s_clear)
{
   /* ctx->Driver.Enable( ctx, GL_STENCIL_TEST, GL_TRUE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= ENABLE_STENCIL_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= ENABLE_STENCIL_WRITE;


   /* ctx->Driver.Enable( ctx, GL_DEPTH_TEST, GL_FALSE )
    */
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] &= ~ENABLE_DIS_DEPTH_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~ENABLE_DIS_DEPTH_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_ENABLES_1] |= DISABLE_DEPTH_TEST;
   i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= DISABLE_DEPTH_WRITE;

   /* ctx->Driver.StencilMask( ctx, s_mask )
    */
   i830->meta.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_WRITE_MASK;
   i830->meta.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_WRITE_MASK |
					   STENCIL_WRITE_MASK((s_mask&0xff)));

   /* ctx->Driver.StencilOp( ctx, GL_REPLACE, GL_REPLACE, GL_REPLACE )
    */
   i830->meta.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_OPS_MASK);
   i830->meta.Ctx[I830_CTXREG_STENCILTST] |= 
      (ENABLE_STENCIL_PARMS |
       STENCIL_FAIL_OP(STENCILOP_REPLACE) |
       STENCIL_PASS_DEPTH_FAIL_OP(STENCILOP_REPLACE) |
       STENCIL_PASS_DEPTH_PASS_OP(STENCILOP_REPLACE));

   /* ctx->Driver.StencilFunc( ctx, GL_ALWAYS, s_clear, ~0 )
    */
   i830->meta.Ctx[I830_CTXREG_STATE4] &= ~MODE4_ENABLE_STENCIL_TEST_MASK;
   i830->meta.Ctx[I830_CTXREG_STATE4] |= (ENABLE_STENCIL_TEST_MASK |
					   STENCIL_TEST_MASK(0xff));

   i830->meta.Ctx[I830_CTXREG_STENCILTST] &= ~(STENCIL_REF_VALUE_MASK |
						ENABLE_STENCIL_TEST_FUNC_MASK);
   i830->meta.Ctx[I830_CTXREG_STENCILTST] |= 
      (ENABLE_STENCIL_REF_VALUE |
       ENABLE_STENCIL_TEST_FUNC |
       STENCIL_REF_VALUE((s_clear&0xff)) |
       STENCIL_TEST_FUNC(COMPAREFUNC_ALWAYS));



   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}


static void set_color_mask( i830ContextPtr i830, GLboolean state )
{
   const GLuint mask = ((1 << WRITEMASK_RED_SHIFT) |
			(1 << WRITEMASK_GREEN_SHIFT) |
			(1 << WRITEMASK_BLUE_SHIFT) |
			(1 << WRITEMASK_ALPHA_SHIFT));

   i830->meta.Ctx[I830_CTXREG_ENABLES_2] &= ~mask;

   if (state) {
      i830->meta.Ctx[I830_CTXREG_ENABLES_2] |= 
	 (i830->state.Ctx[I830_CTXREG_ENABLES_2] & mask);
   }
      
   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}

/* Installs a one-stage passthrough texture blend pipeline.  Is there
 * more that can be done to turn off texturing?
 */
static void set_no_texture( i830ContextPtr i830 )
{
   static const struct gl_tex_env_combine_state comb = {
      GL_NONE, GL_NONE,
      { GL_TEXTURE, 0, 0, }, { GL_TEXTURE, 0, 0, },
      { GL_SRC_COLOR, 0, 0 }, { GL_SRC_ALPHA, 0, 0 },
      0, 0, 0, 0
   };

   i830->meta.TexBlendWordsUsed[0] =
     i830SetTexEnvCombine( i830, & comb, 0, TEXBLENDARG_TEXEL0,
			   i830->meta.TexBlend[0], NULL);

   i830->meta.TexBlend[0][0] |= TEXOP_LAST_STAGE;
   i830->meta.emitted &= ~I830_UPLOAD_TEXBLEND(0);
}

/* Set up a single element blend stage for 'replace' texturing with no
 * funny ops.
 */
static void enable_texture_blend_replace( i830ContextPtr i830 )
{
   static const struct gl_tex_env_combine_state comb = {
      GL_REPLACE, GL_REPLACE,
      { GL_TEXTURE, GL_TEXTURE, GL_TEXTURE }, { GL_TEXTURE, GL_TEXTURE, GL_TEXTURE, },
      { GL_SRC_COLOR, GL_SRC_COLOR, GL_SRC_COLOR }, { GL_SRC_ALPHA, GL_SRC_ALPHA, GL_SRC_ALPHA },
      0, 0, 1, 1
   };

   i830->meta.TexBlendWordsUsed[0] =
     i830SetTexEnvCombine( i830, & comb, 0, TEXBLENDARG_TEXEL0,
			   i830->meta.TexBlend[0], NULL);

   i830->meta.TexBlend[0][0] |= TEXOP_LAST_STAGE;
   i830->meta.emitted &= ~I830_UPLOAD_TEXBLEND(0);

/*    fprintf(stderr, "%s: TexBlendWordsUsed[0]: %d\n",  */
/* 	   __FUNCTION__, i830->meta.TexBlendWordsUsed[0]); */
}



/* Set up an arbitary piece of memory as a rectangular texture
 * (including the front or back buffer).
 */
static void set_tex_rect_source( i830ContextPtr i830,
				 GLuint offset,
				 GLuint width, 
				 GLuint height,
				 GLuint pitch, /* in bytes */
				 GLuint textureFormat )
{
   GLint numLevels = 1;
   GLuint *setup = i830->meta.Tex[0];

/*    fprintf(stderr, "%s: offset: %x w: %d h: %d pitch %d format %x\n", */
/* 	   __FUNCTION__, offset, width, height, pitch, textureFormat ); */

   setup[I830_TEXREG_TM0LI] = (_3DSTATE_LOAD_STATE_IMMEDIATE_2 | 
			       (LOAD_TEXTURE_MAP0 << 0) | 4);
   setup[I830_TEXREG_TM0S0] = (TM0S0_USE_FENCE | offset);
   setup[I830_TEXREG_TM0S1] = (((height - 1) << TM0S1_HEIGHT_SHIFT) |
			       ((width - 1) << TM0S1_WIDTH_SHIFT) |
			       textureFormat);
   setup[I830_TEXREG_TM0S2] = ((((pitch / 4) - 1) << TM0S2_PITCH_SHIFT));   
   setup[I830_TEXREG_TM0S3] &= ~TM0S3_MAX_MIP_MASK;
   setup[I830_TEXREG_TM0S3] &= ~TM0S3_MIN_MIP_MASK;
   setup[I830_TEXREG_TM0S3] |= ((numLevels - 1)*4) << TM0S3_MIN_MIP_SHIFT;

   setup[I830_TEXREG_MCS] = (_3DSTATE_MAP_COORD_SET_CMD |
			     MAP_UNIT(0) |
			     ENABLE_TEXCOORD_PARAMS |
			     TEXCOORDS_ARE_IN_TEXELUNITS |
			     TEXCOORDTYPE_CARTESIAN |
			     ENABLE_ADDR_V_CNTL |
			     TEXCOORD_ADDR_V_MODE(TEXCOORDMODE_WRAP) |
			     ENABLE_ADDR_U_CNTL |
			     TEXCOORD_ADDR_U_MODE(TEXCOORDMODE_WRAP));

   i830->meta.emitted &= ~I830_UPLOAD_TEX(0);
}


/* Select between front and back draw buffers.
 */
static void set_draw_region( i830ContextPtr i830,
			      const intelRegion *region )
{
   i830->meta.Buffer[I830_DESTREG_CBUFADDR1] =
      (BUF_3D_ID_COLOR_BACK | BUF_3D_PITCH(region->pitch) | BUF_3D_USE_FENCE);
   i830->meta.Buffer[I830_DESTREG_CBUFADDR2] = region->offset;
   i830->meta.emitted &= ~I830_UPLOAD_BUFFERS;
}

/* Setup an arbitary draw format, useful for targeting
 * texture or agp memory.
 */
#if 0
static void set_draw_format( i830ContextPtr i830,
			     GLuint format,
			     GLuint depth_format)
{
   i830->meta.Buffer[I830_DESTREG_DV1] = (DSTORG_HORT_BIAS(0x8) | /* .5 */
					  DSTORG_VERT_BIAS(0x8) | /* .5 */
					  format |
					  DEPTH_IS_Z |
					  depth_format);
}
#endif


static void set_vertex_format( i830ContextPtr i830 )
{
   i830->meta.Ctx[I830_CTXREG_VF] =  (_3DSTATE_VFT0_CMD |
				      VFT0_TEX_COUNT(1) |
				      VFT0_DIFFUSE |
				      VFT0_SPEC |
				      VFT0_XYZW);
   i830->meta.Ctx[I830_CTXREG_VF2] = (_3DSTATE_VFT1_CMD |
				      VFT1_TEX0_FMT(TEXCOORDFMT_2D) |
				      VFT1_TEX1_FMT(TEXCOORDFMT_2D) | 
				      VFT1_TEX2_FMT(TEXCOORDFMT_2D) |
				      VFT1_TEX3_FMT(TEXCOORDFMT_2D));
   i830->meta.emitted &= ~I830_UPLOAD_CTX;
}


static void draw_quad(i830ContextPtr i830, 
		      GLfloat x0, GLfloat x1,
		      GLfloat y0, GLfloat y1, 
		      GLubyte red, GLubyte green,
		      GLubyte blue, GLubyte alpha,
		      GLfloat s0, GLfloat s1,
		      GLfloat t0, GLfloat t1 )
{
   GLuint vertex_size = 8;
   GLuint *vb = intelEmitInlinePrimitiveLocked( &i830->intel, 
						PRIM3D_TRIFAN, 
						4*vertex_size,
						vertex_size );
   intelVertex tmp;
   int i;

   
/*    fprintf(stderr, "%s: %f,%f-%f,%f 0x%x%x%x%x %f,%f-%f,%f\n", */
/* 	   __FUNCTION__, */
/* 	   x0,y0,x1,y1,red,green,blue,alpha,s0,t0,s1,t1); */


   /* initial vertex, left bottom */
   tmp.v.x = x0;
   tmp.v.y = y0;
   tmp.v.z = 1.0;
   tmp.v.w = 1.0;
   tmp.v.color.red = red;
   tmp.v.color.green = green;
   tmp.v.color.blue = blue;
   tmp.v.color.alpha = alpha;
   tmp.v.specular.red = 0;
   tmp.v.specular.green = 0;
   tmp.v.specular.blue = 0;
   tmp.v.specular.alpha = 0;
   tmp.v.u0 = s0;
   tmp.v.v0 = t0;
   for (i = 0 ; i < 8 ; i++)
      vb[i] = tmp.ui[i];

   /* right bottom */
   vb += 8;
   tmp.v.x = x1;
   tmp.v.u0 = s1;
   for (i = 0 ; i < 8 ; i++)
      vb[i] = tmp.ui[i];

   /* right top */
   vb += 8;
   tmp.v.y = y1;
   tmp.v.v0 = t1;
   for (i = 0 ; i < 8 ; i++)
      vb[i] = tmp.ui[i];

   /* left top */
   vb += 8;
   tmp.v.x = x0;
   tmp.v.u0 = s0;
   for (i = 0 ; i < 8 ; i++)
      vb[i] = tmp.ui[i];

/*    fprintf(stderr, "%s: DV1: %x\n",  */
/* 	   __FUNCTION__, i830->meta.Buffer[I830_DESTREG_DV1]); */
}

static void draw_poly(i830ContextPtr i830, 
		      GLubyte red, GLubyte green, GLubyte blue, GLubyte alpha,
                      GLuint numVerts,
                      GLfloat verts[][2],
                      GLfloat texcoords[][2])
{
   GLuint vertex_size = 8;
   GLuint *vb = intelEmitInlinePrimitiveLocked( &i830->intel, 
						PRIM3D_TRIFAN, 
						numVerts * vertex_size,
						vertex_size );
   intelVertex tmp;
   int i, k;

   /* initial constant vertex fields */
   tmp.v.z = 1.0;
   tmp.v.w = 1.0; 
   tmp.v.color.red = red;
   tmp.v.color.green = green;
   tmp.v.color.blue = blue;
   tmp.v.color.alpha = alpha;
   tmp.v.specular.red = 0;
   tmp.v.specular.green = 0;
   tmp.v.specular.blue = 0;
   tmp.v.specular.alpha = 0;

   for (k = 0; k < numVerts; k++) {
      tmp.v.x = verts[k][0];
      tmp.v.y = verts[k][1];
      tmp.v.u0 = texcoords[k][0];
      tmp.v.v0 = texcoords[k][1];

      for (i = 0 ; i < vertex_size ; i++)
         vb[i] = tmp.ui[i];

      vb += vertex_size;
   }
}

void 
i830ClearWithTris(intelContextPtr intel, GLbitfield mask,
		  GLboolean allFoo,
		  GLint cxFoo, GLint cyFoo, GLint cwFoo, GLint chFoo)
{
   i830ContextPtr i830 = I830_CONTEXT( intel );
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   intelScreenPrivate *screen = intel->intelScreen;
   int x0, y0, x1, y1;
   GLint cx, cy, cw, ch;
   GLboolean all;

   INTEL_FIREVERTICES(intel);
   SET_STATE( i830, meta );
   set_initial_state( i830 );
/*    set_no_texture( i830 ); */
   set_vertex_format( i830 ); 

   LOCK_HARDWARE(intel);

   /* get clear bounds after locking */
   cx = intel->ctx.DrawBuffer->_Xmin;
   cy = intel->ctx.DrawBuffer->_Ymin;
   cw = intel->ctx.DrawBuffer->_Xmax - cx;
   ch = intel->ctx.DrawBuffer->_Ymax - cy;
   all = (cw == intel->ctx.DrawBuffer->Width &&
          ch == intel->ctx.DrawBuffer->Height);

   if(!all) {
      x0 = cx;
      y0 = cy;
      x1 = x0 + cw;
      y1 = y0 + ch;
   } else {
      x0 = 0;
      y0 = 0;
      x1 = x0 + dPriv->w;
      y1 = y0 + dPriv->h;
   }

   /* Don't do any clipping to screen - these are window coordinates.
    * The active cliprects will be applied as for any other geometry.
    */

   if(mask & BUFFER_BIT_FRONT_LEFT) {
      set_no_depth_stencil_write( i830 );
      set_color_mask( i830, GL_TRUE );
      set_draw_region( i830, &screen->front );
      draw_quad(i830, x0, x1, y0, y1,
		intel->clear_red, intel->clear_green,
		intel->clear_blue, intel->clear_alpha,
		0, 0, 0, 0);
   }

   if(mask & BUFFER_BIT_BACK_LEFT) {
      set_no_depth_stencil_write( i830 );
      set_color_mask( i830, GL_TRUE );
      set_draw_region( i830, &screen->back );

      draw_quad(i830, x0, x1, y0, y1,
		intel->clear_red, intel->clear_green,
		intel->clear_blue, intel->clear_alpha,
		0, 0, 0, 0);
   }

   if(mask & BUFFER_BIT_STENCIL) {
      set_stencil_replace( i830, 
			   intel->ctx.Stencil.WriteMask[0], 
			   intel->ctx.Stencil.Clear);

      set_color_mask( i830, GL_FALSE );
      set_draw_region( i830, &screen->front );
      draw_quad( i830, x0, x1, y0, y1, 0, 0, 0, 0, 0, 0, 0, 0 );
   }

   UNLOCK_HARDWARE(intel);

   INTEL_FIREVERTICES(intel);
   SET_STATE( i830, state );
}


#if 0

GLboolean
i830TryTextureReadPixels( GLcontext *ctx,
			  GLint x, GLint y, GLsizei width, GLsizei height,
			  GLenum format, GLenum type,
			  const struct gl_pixelstore_attrib *pack,
			  GLvoid *pixels )
{
   i830ContextPtr i830 = I830_CONTEXT(ctx);
   intelContextPtr intel = INTEL_CONTEXT(ctx);
   intelScreenPrivate *screen = i830->intel.intelScreen;
   GLint pitch = pack->RowLength ? pack->RowLength : width;
   __DRIdrawablePrivate *dPriv = i830->intel.driDrawable;
   int textureFormat;
   GLenum glTextureFormat;
   int src_offset = i830->meta.Buffer[I830_DESTREG_CBUFADDR2];
   int destOffset = intelAgpOffsetFromVirtual( &i830->intel, pixels);
   int destFormat, depthFormat, destPitch;
   drm_clip_rect_t tmp;

   if (INTEL_DEBUG & DEBUG_PIXEL)
      fprintf(stderr, "%s\n", __FUNCTION__);


   if (	ctx->_ImageTransferState ||
	pack->SwapBytes ||
	pack->LsbFirst ||
	!pack->Invert) {
      fprintf(stderr, "%s: check_color failed\n", __FUNCTION__);
      return GL_FALSE;
   }

   switch (screen->fbFormat) {
   case DV_PF_565:
      textureFormat = MAPSURF_16BIT | MT_16BIT_RGB565;
      glTextureFormat = GL_RGB;
      break;
   case DV_PF_555:
      textureFormat = MAPSURF_16BIT | MT_16BIT_ARGB1555;
      glTextureFormat = GL_RGBA;
      break;
   case DV_PF_8888:
      textureFormat = MAPSURF_32BIT | MT_32BIT_ARGB8888;
      glTextureFormat = GL_RGBA;
      break;
   default:
      fprintf(stderr, "%s: textureFormat failed %x\n", __FUNCTION__,
	      screen->fbFormat);
      return GL_FALSE;
   }


   switch (type) {
   case GL_UNSIGNED_SHORT_5_6_5: 
      if (format != GL_RGB) return GL_FALSE;
      destFormat = COLR_BUF_RGB565; 
      depthFormat = DEPTH_FRMT_16_FIXED;
      destPitch = pitch * 2;
      break;
   case GL_UNSIGNED_INT_8_8_8_8_REV: 
      if (format != GL_BGRA) return GL_FALSE;
      destFormat = COLR_BUF_ARGB8888; 
      depthFormat = DEPTH_FRMT_24_FIXED_8_OTHER;
      destPitch = pitch * 4;
      break;
   default:
      fprintf(stderr, "%s: destFormat failed %s\n", __FUNCTION__,
	      _mesa_lookup_enum_by_nr(type));
      return GL_FALSE;
   }

   destFormat |= (0x02<<24);

/*    fprintf(stderr, "type: %s destFormat: %x\n", */
/* 	   _mesa_lookup_enum_by_nr(type), */
/* 	   destFormat); */

   intelFlush( ctx );

   SET_STATE( i830, meta );
   set_initial_state( i830 );
   set_no_depth_stencil_write( i830 );

   LOCK_HARDWARE( intel );
   {
      intelWaitForIdle( intel ); /* required by GL */

      if (!driClipRectToFramebuffer(ctx->ReadBuffer, &x, &y, &width, &height)) {
	 UNLOCK_HARDWARE( intel );
	 SET_STATE(i830, state);
	 fprintf(stderr, "%s: cliprect failed\n", __FUNCTION__);
	 return GL_TRUE;
      }

#if 0
      /* FIXME -- Just emit the correct state
       */
      if (i830SetParam(i830->driFd, I830_SETPARAM_CBUFFER_PITCH, 
		      destPitch) != 0) {
	 UNLOCK_HARDWARE( intel );
	 SET_STATE(i830, state);
	 fprintf(stderr, "%s: setparam failed\n", __FUNCTION__);
	 return GL_FALSE;
      }
#endif


      y = dPriv->h - y - height;
      x += dPriv->x;
      y += dPriv->y;


      /* Set the frontbuffer up as a large rectangular texture.
       */
      set_tex_rect_source( i830, 
			   src_offset, 
			   screen->width, 
			   screen->height, 
			   screen->front.pitch, 
			   textureFormat ); 
   
   
      enable_texture_blend_replace( i830 ); 


      /* Set the 3d engine to draw into the agp memory
       */

      set_draw_region( i830, destOffset ); 
      set_draw_format( i830, destFormat, depthFormat );  


      /* Draw a single quad, no cliprects:
       */
      i830->intel.numClipRects = 1;
      i830->intel.pClipRects = &tmp;
      i830->intel.pClipRects[0].x1 = 0;
      i830->intel.pClipRects[0].y1 = 0;
      i830->intel.pClipRects[0].x2 = width;
      i830->intel.pClipRects[0].y2 = height;

      draw_quad( i830, 
		 0, width, 0, height, 
		 0, 255, 0, 0, 
		 x, x+width, y, y+height );

      intelWindowMoved( intel );
   }
   UNLOCK_HARDWARE( intel );
   intelFinish( ctx ); /* required by GL */

   SET_STATE( i830, state );
   return GL_TRUE;
}


GLboolean
i830TryTextureDrawPixels( GLcontext *ctx,
			  GLint x, GLint y, GLsizei width, GLsizei height,
			  GLenum format, GLenum type,
			  const struct gl_pixelstore_attrib *unpack,
			  const GLvoid *pixels )
{
   intelContextPtr intel = INTEL_CONTEXT(ctx);
   i830ContextPtr i830 = I830_CONTEXT(ctx);
   GLint pitch = unpack->RowLength ? unpack->RowLength : width;
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   int textureFormat;
   GLenum glTextureFormat;
   int dst_offset = i830->meta.Buffer[I830_DESTREG_CBUFADDR2];
   int src_offset = intelAgpOffsetFromVirtual( intel, pixels );

   if (INTEL_DEBUG & DEBUG_PIXEL)
      fprintf(stderr, "%s\n", __FUNCTION__);

   /* Todo -- upload images that aren't in agp space, then texture
    * from them.  
    */

   if ( !intelIsAgpMemory( intel, pixels, pitch*height ) ) {
      fprintf(stderr, "%s: intelIsAgpMemory failed\n", __FUNCTION__);
      return GL_FALSE;
   }

   /* Todo -- don't want to clobber all the drawing state like we do
    * for readpixels -- most of this state can be handled just fine.
    */
   if (	ctx->_ImageTransferState ||
	unpack->SwapBytes ||
	unpack->LsbFirst ||
	ctx->Color.AlphaEnabled || 
	ctx->Depth.Test ||
	ctx->Fog.Enabled ||
	ctx->Scissor.Enabled ||
	ctx->Stencil.Enabled ||
	!ctx->Color.ColorMask[0] ||
	!ctx->Color.ColorMask[1] ||
	!ctx->Color.ColorMask[2] ||
	!ctx->Color.ColorMask[3] ||
	ctx->Color.ColorLogicOpEnabled ||
	ctx->Texture._EnabledUnits ||
	ctx->Depth.OcclusionTest) {
      fprintf(stderr, "%s: other tests failed\n", __FUNCTION__);
      return GL_FALSE;
   }

   /* Todo -- remove these restrictions:
    */
   if (ctx->Pixel.ZoomX != 1.0F ||
       ctx->Pixel.ZoomY != -1.0F)
      return GL_FALSE;



   switch (type) {
   case GL_UNSIGNED_SHORT_1_5_5_5_REV:
      if (format != GL_BGRA) return GL_FALSE;
      textureFormat = MAPSURF_16BIT | MT_16BIT_ARGB1555;
      glTextureFormat = GL_RGBA;
      break;
   case GL_UNSIGNED_SHORT_5_6_5: 
      if (format != GL_RGB) return GL_FALSE;
      textureFormat = MAPSURF_16BIT | MT_16BIT_RGB565;
      glTextureFormat = GL_RGB;
      break;
   case GL_UNSIGNED_SHORT_8_8_MESA: 
      if (format != GL_YCBCR_MESA) return GL_FALSE;
      textureFormat = (MAPSURF_422 | MT_422_YCRCB_SWAPY 
/*  		       | TM0S1_COLORSPACE_CONVERSION */
	 );
      glTextureFormat = GL_YCBCR_MESA;
      break;
   case GL_UNSIGNED_SHORT_8_8_REV_MESA: 
      if (format != GL_YCBCR_MESA) return GL_FALSE;
      textureFormat = (MAPSURF_422 | MT_422_YCRCB_NORMAL 
/* 		       | TM0S1_COLORSPACE_CONVERSION */
	 );
      glTextureFormat = GL_YCBCR_MESA;
      break;
   case GL_UNSIGNED_INT_8_8_8_8_REV: 
      if (format != GL_BGRA) return GL_FALSE;
      textureFormat = MAPSURF_32BIT | MT_32BIT_ARGB8888;
      glTextureFormat = GL_RGBA;
      break;
   default:
      fprintf(stderr, "%s: destFormat failed\n", __FUNCTION__);
      return GL_FALSE;
   }

   intelFlush( ctx );

   SET_STATE( i830, meta );

   LOCK_HARDWARE( intel );
   {
      intelWaitForIdle( intel ); /* required by GL */

      y -= height;			/* cope with pixel zoom */

      if (!driClipRectToFramebuffer(ctx->ReadBuffer, &x, &y, &width, &height)) {
	 UNLOCK_HARDWARE( intel );
	 SET_STATE(i830, state);
	 fprintf(stderr, "%s: cliprect failed\n", __FUNCTION__);
	 return GL_TRUE;
      }


      y = dPriv->h - y - height;

      set_initial_state( i830 );

      /* Set the pixel image up as a rectangular texture.
       */
      set_tex_rect_source( i830, 
			   src_offset, 
			   width, 
			   height, 
			   pitch, /* XXXX!!!! -- /2 sometimes */
			   textureFormat ); 
   
   
      enable_texture_blend_replace( i830 ); 

   
      /* Draw to the current draw buffer:
       */
      set_draw_offset( i830, dst_offset );

      /* Draw a quad, use regular cliprects
       */
/*       fprintf(stderr, "x: %d y: %d width %d height %d\n", x, y, width, height); */

      draw_quad( i830, 
		 x, x+width, y, y+height,
		 0, 255, 0, 0, 
		 0, width, 0, height );

      intelWindowMoved( intel );
   }
   UNLOCK_HARDWARE( intel );
   intelFinish( ctx ); /* required by GL */
   
   SET_STATE(i830, state);

   return GL_TRUE;
}

#endif

/**
 * Copy the window contents named by dPriv to the rotated (or reflected)
 * color buffer.
 * srcBuf is BUFFER_BIT_FRONT_LEFT or BUFFER_BIT_BACK_LEFT to indicate the source.
 */
void
i830RotateWindow(intelContextPtr intel, __DRIdrawablePrivate *dPriv,
                 GLuint srcBuf)
{
   i830ContextPtr i830 = I830_CONTEXT( intel );
   intelScreenPrivate *screen = intel->intelScreen;
   const GLuint cpp = screen->cpp;
   drm_clip_rect_t fullRect;
   GLuint textureFormat, srcOffset, srcPitch;
   const drm_clip_rect_t *clipRects;
   int numClipRects;
   int i;

   int xOrig, yOrig;
   int origNumClipRects;
   drm_clip_rect_t *origRects;

   /*
    * set up hardware state
    */
   intelFlush( &intel->ctx );

   SET_STATE( i830, meta ); 
   set_initial_state( i830 ); 
   set_no_texture( i830 ); 
   set_vertex_format( i830 ); 
   set_no_depth_stencil_write( i830 );
   set_color_mask( i830, GL_FALSE );

   LOCK_HARDWARE(intel);

   /* save current drawing origin and cliprects (restored at end) */
   xOrig = intel->drawX;
   yOrig = intel->drawY;
   origNumClipRects = intel->numClipRects;
   origRects = intel->pClipRects;

   if (!intel->numClipRects)
      goto done;

   /*
    * set drawing origin, cliprects for full-screen access to rotated screen
    */
   fullRect.x1 = 0;
   fullRect.y1 = 0;
   fullRect.x2 = screen->rotatedWidth;
   fullRect.y2 = screen->rotatedHeight;
   intel->drawX = 0;
   intel->drawY = 0;
   intel->numClipRects = 1;
   intel->pClipRects = &fullRect;

   set_draw_region( i830, &screen->rotated );

   if (cpp == 4)
      textureFormat = MAPSURF_32BIT | MT_32BIT_ARGB8888;
   else
      textureFormat = MAPSURF_16BIT | MT_16BIT_RGB565;

   if (srcBuf == BUFFER_BIT_FRONT_LEFT) {
      srcPitch = screen->front.pitch;   /* in bytes */
      srcOffset = screen->front.offset; /* bytes */
      clipRects = dPriv->pClipRects;
      numClipRects = dPriv->numClipRects;
   }
   else {
      srcPitch = screen->back.pitch;   /* in bytes */
      srcOffset = screen->back.offset; /* bytes */
      clipRects = dPriv->pBackClipRects;
      numClipRects = dPriv->numBackClipRects;
   }

   /* set the whole screen up as a texture to avoid alignment issues */
   set_tex_rect_source(i830,
                       srcOffset,
                       screen->width,
                       screen->height,
                       srcPitch,
                       textureFormat);

   enable_texture_blend_replace(i830);

   /*
    * loop over the source window's cliprects
    */
   for (i = 0; i < numClipRects; i++) {
      int srcX0 = clipRects[i].x1;
      int srcY0 = clipRects[i].y1;
      int srcX1 = clipRects[i].x2;
      int srcY1 = clipRects[i].y2;
      GLfloat verts[4][2], tex[4][2];
      int j;

      /* build vertices for four corners of clip rect */
      verts[0][0] = srcX0;  verts[0][1] = srcY0;
      verts[1][0] = srcX1;  verts[1][1] = srcY0;
      verts[2][0] = srcX1;  verts[2][1] = srcY1;
      verts[3][0] = srcX0;  verts[3][1] = srcY1;

      /* .. and texcoords */
      tex[0][0] = srcX0;  tex[0][1] = srcY0;
      tex[1][0] = srcX1;  tex[1][1] = srcY0;
      tex[2][0] = srcX1;  tex[2][1] = srcY1;
      tex[3][0] = srcX0;  tex[3][1] = srcY1;

      /* transform coords to rotated screen coords */

      for (j = 0; j < 4; j++) {
         matrix23TransformCoordf(&screen->rotMatrix,
                                 &verts[j][0], &verts[j][1]);
      }

      /* draw polygon to map source image to dest region */
      draw_poly(i830, 255, 255, 255, 255, 4, verts, tex);

   } /* cliprect loop */

   intelFlushBatchLocked( intel, GL_FALSE, GL_FALSE, GL_FALSE );

 done:
   /* restore original drawing origin and cliprects */
   intel->drawX = xOrig;
   intel->drawY = yOrig;
   intel->numClipRects = origNumClipRects;
   intel->pClipRects = origRects;

   UNLOCK_HARDWARE(intel);

   SET_STATE( i830, state );
}