summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/i915/i915_texprog.c
blob: 4fbce34ba21c4666fb4caead485a970d6a016d87 (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
/**************************************************************************
 * 
 * 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 <strings.h>

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

#include "tnl/t_context.h"
#include "intel_batchbuffer.h"

#include "i915_reg.h"
#include "i915_context.h"
#include "i915_program.h"

static GLuint translate_tex_src_bit( struct i915_fragment_program *p,
				     GLubyte bit )
{
   switch (bit) {
   case TEXTURE_1D_BIT:   return D0_SAMPLE_TYPE_2D;
   case TEXTURE_2D_BIT:   return D0_SAMPLE_TYPE_2D;
   case TEXTURE_RECT_BIT: return D0_SAMPLE_TYPE_2D;
   case TEXTURE_3D_BIT:   return D0_SAMPLE_TYPE_VOLUME;
   case TEXTURE_CUBE_BIT: return D0_SAMPLE_TYPE_CUBE;
   default: i915_program_error(p, "TexSrcBit"); return 0;
   }
}

static GLuint get_source( struct i915_fragment_program *p, 
			  GLenum src, GLuint unit )
{
   switch (src) {
   case GL_TEXTURE: 
      if (p->src_texture == UREG_BAD) {

	 /* TODO: Use D0_CHANNEL_XY where possible.
	  */
	 GLuint dim = translate_tex_src_bit( p, p->ctx->Texture.Unit[unit]._ReallyEnabled);
	 GLuint sampler = i915_emit_decl(p, REG_TYPE_S, unit, dim);
	 GLuint texcoord = i915_emit_decl(p, REG_TYPE_T, unit, D0_CHANNEL_ALL);
	 GLuint tmp = i915_get_temp( p );
	 GLuint op = T0_TEXLD;

	 if (p->VB->TexCoordPtr[unit]->size == 4)
	    op = T0_TEXLDP;

	 p->src_texture = i915_emit_texld( p, tmp, A0_DEST_CHANNEL_ALL, 
					  sampler, texcoord, op );
      }

      return p->src_texture;

      /* Crossbar: */
   case GL_TEXTURE0:
   case GL_TEXTURE1:
   case GL_TEXTURE2:
   case GL_TEXTURE3:
   case GL_TEXTURE4:
   case GL_TEXTURE5:
   case GL_TEXTURE6:
   case GL_TEXTURE7: {
      return UREG_BAD;
   }

   case GL_CONSTANT:
      return i915_emit_const4fv( p, p->ctx->Texture.Unit[unit].EnvColor );
   case GL_PRIMARY_COLOR:
      return i915_emit_decl(p, REG_TYPE_T, T_DIFFUSE, D0_CHANNEL_ALL);
   case GL_PREVIOUS:
   default: 
      i915_emit_decl(p, 
		GET_UREG_TYPE(p->src_previous),
		GET_UREG_NR(p->src_previous), D0_CHANNEL_ALL); 
      return p->src_previous;
   }
}
			

static GLuint emit_combine_source( struct i915_fragment_program *p, 
				   GLuint mask,
				   GLuint unit,
				   GLenum source, 
				   GLenum operand )
{
   GLuint arg, src;

   src = get_source(p, source, unit);

   switch (operand) {
   case GL_ONE_MINUS_SRC_COLOR: 
      /* Get unused tmp,
       * Emit tmp = 1.0 + arg.-x-y-z-w
       */
      arg = i915_get_temp( p );
      return i915_emit_arith( p, A0_ADD, arg, mask, 0,
		  swizzle(src, ONE, ONE, ONE, ONE ),
		  negate(src, 1,1,1,1), 0);

   case GL_SRC_ALPHA: 
      if (mask == A0_DEST_CHANNEL_W)
	 return src;
      else
	 return swizzle( src, W, W, W, W );
   case GL_ONE_MINUS_SRC_ALPHA: 
      /* Get unused tmp,
       * Emit tmp = 1.0 + arg.-w-w-w-w
       */
      arg = i915_get_temp( p );
      return i915_emit_arith( p, A0_ADD, arg, mask, 0,
			 swizzle(src, ONE, ONE, ONE, ONE ),
			 negate( swizzle(src,W,W,W,W), 1,1,1,1), 0);
   case GL_SRC_COLOR: 
   default:
      return src;
   }
}



static int nr_args( GLenum mode )
{
   switch (mode) {
   case GL_REPLACE: return 1; 
   case GL_MODULATE: return 2;
   case GL_ADD: return 2;
   case GL_ADD_SIGNED: return 2;
   case GL_INTERPOLATE:	return 3;
   case GL_SUBTRACT: return 2;
   case GL_DOT3_RGB_EXT: return 2;
   case GL_DOT3_RGBA_EXT: return 2;
   case GL_DOT3_RGB: return 2;
   case GL_DOT3_RGBA: return 2;
   default: return 0;
   }
}


static GLboolean args_match( struct gl_texture_unit *texUnit )
{
   int i, nr = nr_args(texUnit->Combine.ModeRGB);

   for (i = 0 ; i < nr ; i++) {
      if (texUnit->Combine.SourceA[i] != texUnit->Combine.SourceRGB[i]) 
	 return GL_FALSE;

      switch(texUnit->Combine.OperandA[i]) {
      case GL_SRC_ALPHA: 
	 switch(texUnit->Combine.OperandRGB[i]) {
	 case GL_SRC_COLOR: 
	 case GL_SRC_ALPHA: 
	    break;
	 default:
	    return GL_FALSE;
	 }
	 break;
      case GL_ONE_MINUS_SRC_ALPHA: 
	 switch(texUnit->Combine.OperandRGB[i]) {
	 case GL_ONE_MINUS_SRC_COLOR: 
	 case GL_ONE_MINUS_SRC_ALPHA: 
	    break;
	 default:
	    return GL_FALSE;
	 }
	 break;
      default: 
	 return GL_FALSE;	/* impossible */
      }
   }

   return GL_TRUE;
}


static GLuint emit_combine( struct i915_fragment_program *p,
			    GLuint dest,
			    GLuint mask,
			    GLuint saturate,
			    GLuint unit,
			    GLenum mode,
			    const GLenum *source,
			    const GLenum *operand)
{
   int tmp, src[3], nr = nr_args(mode);
   int i;

   for (i = 0; i < nr; i++)
      src[i] = emit_combine_source( p, mask, unit, source[i], operand[i] );

   switch (mode) {
   case GL_REPLACE: 
      if (mask == A0_DEST_CHANNEL_ALL && !saturate)
	 return src[0];
      else
	 return i915_emit_arith( p, A0_MOV, dest, mask, saturate, src[0], 0, 0 );
   case GL_MODULATE: 
      return i915_emit_arith( p, A0_MUL, dest, mask, saturate,
			     src[0], src[1], 0 );
   case GL_ADD: 
      return i915_emit_arith( p, A0_ADD, dest, mask, saturate, 
			     src[0], src[1], 0 );
   case GL_ADD_SIGNED:
      /* tmp = arg0 + arg1
       * result = tmp + -.5
       */
      tmp = i915_emit_const1f(p, .5);
      tmp = negate(swizzle(tmp,X,X,X,X),1,1,1,1);
      i915_emit_arith( p, A0_ADD, dest, mask, 0, src[0], src[1], 0 );
      i915_emit_arith( p, A0_ADD, dest, mask, saturate, dest, tmp, 0 );
      return dest;
   case GL_INTERPOLATE:		/* TWO INSTRUCTIONS */
      /* Arg0 * (Arg2) + Arg1 * (1-Arg2)
       *
       * Arg0*Arg2 + Arg1 - Arg1Arg2 
       *
       * tmp = Arg0*Arg2 + Arg1, 
       * result = (-Arg1)Arg2 + tmp 
       */
      tmp = i915_get_temp( p );
      i915_emit_arith( p, A0_MAD, tmp, mask, 0, src[0], src[2], src[1] );
      i915_emit_arith( p, A0_MAD, dest, mask, saturate, 
		      negate(src[1], 1,1,1,1), src[2], tmp );
      return dest;
   case GL_SUBTRACT: 
      /* negate src[1] */
      return i915_emit_arith( p, A0_ADD, dest, mask, saturate, src[0],
			 negate(src[1],1,1,1,1), 0 );

   case GL_DOT3_RGBA:
   case GL_DOT3_RGBA_EXT: 
   case GL_DOT3_RGB_EXT:
   case GL_DOT3_RGB: {
      GLuint tmp0 = i915_get_temp( p );
      GLuint tmp1 = i915_get_temp( p );
      GLuint neg1 = negate(swizzle(i915_emit_const1f(p, 1),X,X,X,X), 1,1,1,1);
      GLuint two = swizzle(i915_emit_const1f(p, 2),X,X,X,X);
      i915_emit_arith( p, A0_MAD, tmp0, A0_DEST_CHANNEL_ALL, 0, 
		      two, src[0], neg1);
      if (src[0] == src[1])
	 tmp1 = tmp0;
      else
	 i915_emit_arith( p, A0_MAD, tmp1, A0_DEST_CHANNEL_ALL, 0, 
			 two, src[1], neg1);
      i915_emit_arith( p, A0_DP3, dest, mask, saturate, tmp0, tmp1, 0);
      return dest;
   }

   default: 
      return src[0];
   }
}

static GLuint get_dest( struct i915_fragment_program *p, int unit )
{
   if (p->ctx->_TriangleCaps & DD_SEPARATE_SPECULAR)
      return i915_get_temp( p );
   else if (unit != p->last_tex_stage)
      return i915_get_temp( p );
   else
      return UREG(REG_TYPE_OC, 0);
}
      


static GLuint emit_texenv( struct i915_fragment_program *p, int unit )
{
   struct gl_texture_unit *texUnit = &p->ctx->Texture.Unit[unit];
   GLenum envMode = texUnit->EnvMode;
   struct gl_texture_object *tObj = texUnit->_Current;
   GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
   GLuint saturate = unit < p->last_tex_stage ? A0_DEST_SATURATE : 0;

   switch(envMode) {
   case GL_BLEND: {
      const int cf = get_source(p, GL_PREVIOUS, unit);
      const int cc = get_source(p, GL_CONSTANT, unit);
      const int cs = get_source(p, GL_TEXTURE, unit);
      const int out = get_dest(p, unit);

      if (format == GL_INTENSITY) {
	 /* cv = cf(1 - cs) + cc.cs
	  * cv = cf - cf.cs + cc.cs
	  */
	 /* u[2] = MAD( -cf * cs + cf )
	  * cv   = MAD( cc * cs + u[2] )
	  */
	 
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, 0, 
			 negate(cf,1,1,1,1), cs, cf );

	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate, 
			 cc, cs, out );

	 return out;
      } else {
	 /* cv = cf(1 - cs) + cc.cs
	  * cv = cf - cf.cs + cc.cs
	  * av =      af.as
	  */
	 /* u[2] = MAD( cf.-x-y-zw * cs.xyzw + cf.xyz0 )
	  * oC   = MAD( cc.xyz0 * cs.xyz0 + u[2].xyzw )
	  */
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, 0,
			 negate(cf,1,1,1,0),  
			 cs,
			 swizzle(cf,X,Y,Z,ZERO) );


	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cc,X,Y,Z,ZERO),  
			 swizzle(cs,X,Y,Z,ZERO),
			 out );

	 return out;
      }
   }

   case GL_DECAL: {
      if (format == GL_RGB ||
	  format == GL_RGBA) {
	 int cf = get_source( p, GL_PREVIOUS, unit );
	 int cs = get_source( p, GL_TEXTURE, unit );
	 int out = get_dest(p, unit);
	 
	 /* cv = cf(1-as) + cs.as
	  * cv = cf.(-as) + cf + cs.as
	  * av = af
	  */ 
	 
	 /* u[2] = mad( cf.xyzw * cs.-w-w-w1 + cf.xyz0 )
	  * oc = mad( cs.xyz0 * cs.www0 + u[2].xyzw )
	  */
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, 0,
			 cf,  
			 negate(swizzle(cs,W,W,W,ONE),1,1,1,0),
			 swizzle(cf,X,Y,Z,ZERO) );
	 
	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cs,X,Y,Z,ZERO),  
			 swizzle(cs,W,W,W,ZERO),
			 out );
	 return out;
      }
      else {
	 return get_source( p, GL_PREVIOUS, unit );
      }
   }

   case GL_REPLACE: {
      const int cs = get_source( p, GL_TEXTURE, unit );	/* saturated */
      switch (format) {
      case GL_ALPHA: {
	 const int cf = get_source( p, GL_PREVIOUS, unit ); /* saturated */
	 i915_emit_arith( p, A0_MOV, cs, A0_DEST_CHANNEL_XYZ, 0, cf, 0, 0 );
	 return cs;
      }
      case GL_RGB:
      case GL_LUMINANCE: {
	 const int cf = get_source( p, GL_PREVIOUS, unit ); /* saturated */
	 i915_emit_arith( p, A0_MOV, cs, A0_DEST_CHANNEL_W, 0, cf, 0, 0 );
	 return cs;
      }
      default:
	 return cs;
      }
   }

   case GL_MODULATE: {
      const int cf = get_source( p, GL_PREVIOUS, unit );
      const int cs = get_source( p, GL_TEXTURE, unit );
      const int out = get_dest(p, unit);
      switch (format) {
      case GL_ALPHA: 
	 i915_emit_arith( p, A0_MUL, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cs, ONE, ONE, ONE, W), cf, 0 );
	 break;
      default:
	 i915_emit_arith( p, A0_MUL, out, A0_DEST_CHANNEL_ALL, saturate, 
			 cs, cf, 0 );
	 break;
      }
      return out;
   }
   case GL_ADD: {
      int cf = get_source( p, GL_PREVIOUS, unit );
      int cs = get_source( p, GL_TEXTURE, unit );
      const int out = get_dest( p, unit );

      if (format == GL_INTENSITY) {
	 /* output-color.rgba = add( incoming, u[1] )
	  */
	 i915_emit_arith( p, A0_ADD, out, A0_DEST_CHANNEL_ALL, saturate, 
			 cs, cf, 0 );
	 return out;
      }
      else {
	 /* cv.xyz = cf.xyz + cs.xyz
	  * cv.w   = cf.w * cs.w
	  *
	  * cv.xyzw = MAD( cf.111w * cs.xyzw + cf.xyz0 )
	  */
 	 i915_emit_arith( p, A0_MAD, out, A0_DEST_CHANNEL_ALL, saturate,
			 swizzle(cf,ONE,ONE,ONE,W), 
			 cs,  
			 swizzle(cf,X,Y,Z,ZERO) ); 
	 return out;
      }
      break;
   }
   case GL_COMBINE: {
      GLuint rgb_shift, alpha_shift, out, shift;
      GLuint dest = get_dest(p, unit);

      /* The EXT version of the DOT3 extension does not support the
       * scale factor, but the ARB version (and the version in OpenGL
       * 1.3) does.
       */
      switch (texUnit->Combine.ModeRGB) {
      case GL_DOT3_RGB_EXT:
	 alpha_shift = texUnit->Combine.ScaleShiftA;
	 rgb_shift = 0;
	 break;

      case GL_DOT3_RGBA_EXT:
	 alpha_shift = 0;
	 rgb_shift = 0;
	 break;

      default:
	 rgb_shift = texUnit->Combine.ScaleShiftRGB;
	 alpha_shift = texUnit->Combine.ScaleShiftA;
	 break;
      }


      /* Emit the RGB and A combine ops
       */
      if (texUnit->Combine.ModeRGB == texUnit->Combine.ModeA && 
	  args_match( texUnit )) {
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_ALL, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
      }
      else if (texUnit->Combine.ModeRGB == GL_DOT3_RGBA_EXT ||
	       texUnit->Combine.ModeRGB == GL_DOT3_RGBA) {

	 out = emit_combine( p, dest, A0_DEST_CHANNEL_ALL, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
      }
      else {
	 /* Need to do something to stop from re-emitting identical
	  * argument calculations here:
	  */
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_XYZ, saturate,
			     unit,
			     texUnit->Combine.ModeRGB,
			     texUnit->Combine.SourceRGB,
			     texUnit->Combine.OperandRGB );
	 out = emit_combine( p, dest, A0_DEST_CHANNEL_W, saturate,
			     unit,
			     texUnit->Combine.ModeA,
			     texUnit->Combine.SourceA,
			     texUnit->Combine.OperandA );
      }

      /* Deal with the final shift:
       */
      if (alpha_shift || rgb_shift) {
	 if (rgb_shift == alpha_shift) {
	    shift = i915_emit_const1f(p, 1<<rgb_shift);
	    shift = swizzle(shift,X,X,X,X);
	 }
	 else {
	    shift = i915_emit_const2f(p, 1<<rgb_shift, 1<<alpha_shift);
	    shift = swizzle(shift,X,X,X,Y);
	 }
	 return i915_emit_arith( p, A0_MUL, dest, A0_DEST_CHANNEL_ALL, 
				saturate, out, shift, 0 );
      }

      return out;
   }

   default:
      return get_source(p, GL_PREVIOUS, 0);
   }
}

static void emit_program_fini( struct i915_fragment_program *p )
{
   int cf = get_source( p, GL_PREVIOUS, 0 );
   int out = UREG( REG_TYPE_OC, 0 );

   if (p->ctx->_TriangleCaps & DD_SEPARATE_SPECULAR) {
      /* Emit specular add.
       */
      GLuint s = i915_emit_decl(p, REG_TYPE_T, T_SPECULAR, D0_CHANNEL_ALL);
      i915_emit_arith( p, A0_ADD, out, A0_DEST_CHANNEL_ALL, 0, cf, 
		  swizzle(s, X,Y,Z,ZERO), 0 );
   }
   else if (cf != out) {
      /* Will wind up in here if no texture enabled or a couple of
       * other scenarios (GL_REPLACE for instance).
       */
      i915_emit_arith( p, A0_MOV, out, A0_DEST_CHANNEL_ALL, 0, cf, 0, 0 );
   }
}


static void i915EmitTextureProgram( i915ContextPtr i915 )
{
   GLcontext *ctx = &i915->intel.ctx;
   struct i915_fragment_program *p = &i915->tex_program;
   GLuint unit;

   if (0) fprintf(stderr, "%s\n", __FUNCTION__);

   i915_init_program( i915, p );

   if (ctx->Texture._EnabledUnits) {
      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits ; unit++)
	 if (ctx->Texture.Unit[unit]._ReallyEnabled) {
	    p->last_tex_stage = unit;
	 }

      for (unit = 0 ; unit < ctx->Const.MaxTextureUnits; unit++)
	 if (ctx->Texture.Unit[unit]._ReallyEnabled) {
	    p->src_previous = emit_texenv( p, unit );
	    p->src_texture = UREG_BAD;
	    p->temp_flag = 0xffff000;
	    p->temp_flag |= 1 << GET_UREG_NR(p->src_previous);
	 }
   }

   emit_program_fini( p );

   i915_fini_program( p );
   i915_upload_program( i915, p );

   p->translated = 1;
}


void i915ValidateTextureProgram( i915ContextPtr i915 )
{
   intelContextPtr intel = &i915->intel;
   GLcontext *ctx = &intel->ctx;
   TNLcontext *tnl = TNL_CONTEXT(ctx);
   struct vertex_buffer *VB = &tnl->vb;
   DECLARE_RENDERINPUTS(index_bitset);
   int i, offset;
   GLuint s4 = i915->state.Ctx[I915_CTXREG_LIS4] & ~S4_VFMT_MASK;
   GLuint s2 = S2_TEXCOORD_NONE;

   RENDERINPUTS_COPY( index_bitset, tnl->render_inputs_bitset );

   /* Important:
    */
   VB->AttribPtr[VERT_ATTRIB_POS] = VB->NdcPtr;
   intel->vertex_attr_count = 0;
   intel->coloroffset = 0;
   intel->specoffset = 0;
   offset = 0;

   if (i915->vertex_fog == I915_FOG_PIXEL) {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, S4_VFMT_XYZW, 16 );
      RENDERINPUTS_CLEAR( index_bitset, _TNL_ATTRIB_FOG );
   }
   else if (RENDERINPUTS_TEST_RANGE( index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX )) {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_4F_VIEWPORT, S4_VFMT_XYZW, 16 );
   }
   else {
      EMIT_ATTR( _TNL_ATTRIB_POS, EMIT_3F_VIEWPORT, S4_VFMT_XYZ, 12 );
   }

   /* How undefined is undefined? */
   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_POINTSIZE )) {
      EMIT_ATTR( _TNL_ATTRIB_POINTSIZE, EMIT_1F, S4_VFMT_POINT_WIDTH, 4 );
   }
      
   intel->coloroffset = offset / 4;
   EMIT_ATTR( _TNL_ATTRIB_COLOR0, EMIT_4UB_4F_BGRA, S4_VFMT_COLOR, 4 );
            
   if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 ) ||
       RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG )) {
      if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_COLOR1 )) {
	 intel->specoffset = offset / 4;
	 EMIT_ATTR( _TNL_ATTRIB_COLOR1, EMIT_3UB_3F_BGR, S4_VFMT_SPEC_FOG, 3 );
      } else 
	 EMIT_PAD( 3 );
      
      if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_FOG ))
	 EMIT_ATTR( _TNL_ATTRIB_FOG, EMIT_1UB_1F, S4_VFMT_SPEC_FOG, 1 );
      else
	 EMIT_PAD( 1 );
   }

   if (RENDERINPUTS_TEST_RANGE( index_bitset, _TNL_FIRST_TEX, _TNL_LAST_TEX )) {
      for (i = 0; i < 8; i++) {
	 if (RENDERINPUTS_TEST( index_bitset, _TNL_ATTRIB_TEX(i) )) {
	    int sz = VB->TexCoordPtr[i]->size;
	    
	    s2 &= ~S2_TEXCOORD_FMT(i, S2_TEXCOORD_FMT0_MASK);
	    s2 |= S2_TEXCOORD_FMT(i, SZ_TO_HW(sz));

	    EMIT_ATTR( _TNL_ATTRIB_TEX0+i, EMIT_SZ(sz), 0, sz * 4 );
	 }
      }
   }

   /* Only need to change the vertex emit code if there has been a
    * statechange to a new hardware vertex format:
    */
   if (s2 != i915->state.Ctx[I915_CTXREG_LIS2] ||
       s4 != i915->state.Ctx[I915_CTXREG_LIS4]) {
    
      I915_STATECHANGE( i915, I915_UPLOAD_CTX );

      i915->tex_program.translated = 0;

      /* Must do this *after* statechange, so as not to affect
       * buffered vertices reliant on the old state:
       */
      intel->vertex_size = _tnl_install_attrs( ctx, 
					       intel->vertex_attrs, 
					       intel->vertex_attr_count,
					       intel->ViewportMatrix.m, 0 ); 

      intel->vertex_size >>= 2;

      i915->state.Ctx[I915_CTXREG_LIS2] = s2;
      i915->state.Ctx[I915_CTXREG_LIS4] = s4;

      assert(intel->vtbl.check_vertex_size( intel, intel->vertex_size ));
   }

   if (!i915->tex_program.translated ||
       i915->last_ReallyEnabled != ctx->Texture._EnabledUnits) {
      i915EmitTextureProgram( i915 );      
      i915->last_ReallyEnabled = ctx->Texture._EnabledUnits;
   }
}