summaryrefslogtreecommitdiffstats
path: root/src/mesa/drivers/dri/r128/r128_texstate.c
blob: 211b9ea2a979d3731092b49f708eff6689ebc9e0 (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
/**************************************************************************

Copyright 1999, 2000 ATI Technologies Inc. and Precision Insight, 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
on 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
ATI, PRECISION INSIGHT AND/OR THEIR 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.

**************************************************************************/

/*
 * Authors:
 *   Gareth Hughes <gareth@valinux.com>
 *   Kevin E. Martin <martin@valinux.com>
 *   Brian Paul <brianp@valinux.com>
 */

#include "glheader.h"
#include "imports.h"
#include "context.h"
#include "macros.h"
#include "texformat.h"

#include "r128_context.h"
#include "r128_state.h"
#include "r128_ioctl.h"
#include "r128_tris.h"
#include "r128_tex.h"


static void r128SetTexImages( r128ContextPtr rmesa,
                              const struct gl_texture_object *tObj )
{
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;
   struct gl_texture_image *baseImage = tObj->Image[0][tObj->BaseLevel];
   int log2Pitch, log2Height, log2Size, log2MinSize;
   int totalSize;
   int i;
   GLint firstLevel, lastLevel;

   assert(t);
   assert(baseImage);

   if ( R128_DEBUG & DEBUG_VERBOSE_API )
      fprintf( stderr, "%s( %p )\n", __FUNCTION__, (void *) tObj );

   switch (baseImage->TexFormat->MesaFormat) {
   case MESA_FORMAT_ARGB8888:
   case MESA_FORMAT_ARGB8888_REV:
      t->textureFormat = R128_DATATYPE_ARGB8888;
      break;
   case MESA_FORMAT_ARGB4444:
   case MESA_FORMAT_ARGB4444_REV:
      t->textureFormat = R128_DATATYPE_ARGB4444;
      break;
   case MESA_FORMAT_RGB565:
   case MESA_FORMAT_RGB565_REV:
      t->textureFormat = R128_DATATYPE_RGB565;
      break;
   case MESA_FORMAT_RGB332:
      t->textureFormat = R128_DATATYPE_RGB8;
      break;
   case MESA_FORMAT_CI8:
      t->textureFormat = R128_DATATYPE_CI8;
      break;
   case MESA_FORMAT_YCBCR:
      t->textureFormat = R128_DATATYPE_YVYU422;
      break;
   case MESA_FORMAT_YCBCR_REV:
      t->textureFormat = R128_DATATYPE_VYUY422;
      break;
   default:
      _mesa_problem(rmesa->glCtx, "Bad texture format in %s", __FUNCTION__);
   };

   /* Compute which mipmap levels we really want to send to the hardware.
    */

   driCalculateTextureFirstLastLevel( (driTextureObject *) t );
   firstLevel = t->base.firstLevel;
   lastLevel  = t->base.lastLevel;

   log2Pitch = tObj->Image[0][firstLevel]->WidthLog2;
   log2Height = tObj->Image[0][firstLevel]->HeightLog2;
   log2Size = MAX2(log2Pitch, log2Height);
   log2MinSize = log2Size;

   t->base.dirty_images[0] = 0;
   totalSize = 0;
   for ( i = firstLevel; i <= lastLevel; i++ ) {
      const struct gl_texture_image *texImage;

      texImage = tObj->Image[0][i];
      if ( !texImage || !texImage->Data ) {
         lastLevel = i - 1;
	 break;
      }

      log2MinSize = texImage->MaxLog2;

      t->image[i - firstLevel].offset = totalSize;
      t->image[i - firstLevel].width  = tObj->Image[0][i]->Width;
      t->image[i - firstLevel].height = tObj->Image[0][i]->Height;

      t->base.dirty_images[0] |= (1 << i);

      totalSize += (tObj->Image[0][i]->Height *
		    tObj->Image[0][i]->Width *
		    tObj->Image[0][i]->TexFormat->TexelBytes);

      /* Offsets must be 32-byte aligned for host data blits and tiling */
      totalSize = (totalSize + 31) & ~31;
   }

   t->base.totalSize = totalSize;
   t->base.firstLevel = firstLevel;
   t->base.lastLevel = lastLevel;

   /* Set the texture format */
   t->setup.tex_cntl &= ~(0xf << 16);
   t->setup.tex_cntl |= t->textureFormat;

   t->setup.tex_combine_cntl = 0x00000000;  /* XXX is this right? */

   t->setup.tex_size_pitch = ((log2Pitch   << R128_TEX_PITCH_SHIFT) |
			      (log2Size    << R128_TEX_SIZE_SHIFT) |
			      (log2Height  << R128_TEX_HEIGHT_SHIFT) |
			      (log2MinSize << R128_TEX_MIN_SIZE_SHIFT));

   for ( i = 0 ; i < R128_MAX_TEXTURE_LEVELS ; i++ ) {
      t->setup.tex_offset[i]  = 0x00000000;
   }

   if (firstLevel == lastLevel)
      t->setup.tex_cntl |= R128_MIP_MAP_DISABLE;
   else
      t->setup.tex_cntl &= ~R128_MIP_MAP_DISABLE;

   /* FYI: r128UploadTexImages( rmesa, t ); used to be called here */
}


/* ================================================================
 * Texture combine functions
 */

#define COLOR_COMB_DISABLE		(R128_COMB_DIS |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_COPY_INPUT		(R128_COMB_COPY_INP |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_MODULATE		(R128_COMB_MODULATE |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_MODULATE_NTEX	(R128_COMB_MODULATE |		\
					 R128_COLOR_FACTOR_NTEX)
#define COLOR_COMB_ADD			(R128_COMB_ADD |		\
					 R128_COLOR_FACTOR_TEX)
#define COLOR_COMB_BLEND_TEX		(R128_COMB_BLEND_TEXTURE |	\
					 R128_COLOR_FACTOR_TEX)
/* Rage 128 Pro/M3 only! */
#define COLOR_COMB_BLEND_COLOR		(R128_COMB_MODULATE2X |		\
					 R128_COMB_FCN_MSB |		\
					 R128_COLOR_FACTOR_CONST_COLOR)

#define ALPHA_COMB_DISABLE		(R128_COMB_ALPHA_DIS |		\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_COPY_INPUT		(R128_COMB_ALPHA_COPY_INP |	\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_MODULATE		(R128_COMB_ALPHA_MODULATE |	\
					 R128_ALPHA_FACTOR_TEX_ALPHA)
#define ALPHA_COMB_MODULATE_NTEX	(R128_COMB_ALPHA_MODULATE |	\
					 R128_ALPHA_FACTOR_NTEX_ALPHA)
#define ALPHA_COMB_ADD			(R128_COMB_ALPHA_ADD |		\
					 R128_ALPHA_FACTOR_TEX_ALPHA)

#define INPUT_INTERP			(R128_INPUT_FACTOR_INT_COLOR |	\
					 R128_INP_FACTOR_A_INT_ALPHA)
#define INPUT_PREVIOUS			(R128_INPUT_FACTOR_PREV_COLOR |	\
					 R128_INP_FACTOR_A_PREV_ALPHA)

static GLboolean r128UpdateTextureEnv( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLint source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   const GLenum format = tObj->Image[0][tObj->BaseLevel]->_BaseFormat;
   GLuint combine;

   if ( R128_DEBUG & DEBUG_VERBOSE_API ) {
      fprintf( stderr, "%s( %p, %d )\n",
	       __FUNCTION__, (void *) ctx, unit );
   }

   if ( unit == 0 ) {
      combine = INPUT_INTERP;
   } else {
      combine = INPUT_PREVIOUS;
   }

   /* Set the texture environment state */
   switch ( texUnit->EnvMode ) {
   case GL_REPLACE:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_DISABLE);		/* A = At            */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_DISABLE);		/* A = At            */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_MODULATE:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_MODULATE |		/* C = CfCt          */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_MODULATE |		/* C = CfCt          */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_DECAL:
      switch ( format ) {
      case GL_RGBA:
	 combine |= (COLOR_COMB_BLEND_TEX |		/* C = Cf(1-At)+CtAt */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_RGB:
	 combine |= (COLOR_COMB_DISABLE |		/* C = Ct            */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
      case GL_LUMINANCE:
      case GL_LUMINANCE_ALPHA:
      case GL_INTENSITY:
	 /* Undefined behaviour - just copy the incoming fragment */
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = undefined     */
		     ALPHA_COMB_COPY_INPUT);		/* A = undefined     */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_BLEND:
      /* Rage 128 Pro and M3 can handle GL_BLEND texturing.
       */
      if ( !R128_IS_PLAIN( rmesa ) ) {
         /* XXX this hasn't been fully tested, I don't have a Pro card. -BP */
	 switch ( format ) {
	 case GL_RGBA:
	 case GL_LUMINANCE_ALPHA:
	    combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-Ct)+CcCt */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;

	 case GL_RGB:
	 case GL_LUMINANCE:
	    combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-Ct)+CcCt */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	    break;

	 case GL_ALPHA:
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;

	 case GL_INTENSITY:
	    /* GH: We could be smarter about this... */
	    switch ( rmesa->env_color & 0xff000000 ) {
	    case 0x00000000:
	       combine |= (COLOR_COMB_BLEND_COLOR |	/* C = Cf(1-It)+CcIt */
			   ALPHA_COMB_MODULATE_NTEX);	/* A = Af(1-It)      */
	    default:
	       combine |= (COLOR_COMB_MODULATE |	/* C = fallback      */
			   ALPHA_COMB_MODULATE);	/* A = fallback      */
	       return GL_FALSE;
	    }
	    break;

	 case GL_COLOR_INDEX:
	 default:
	    return GL_FALSE;
	 }
	 break;
      }

      /* Rage 128 has to fake some cases of GL_BLEND, otherwise fallback
       * to software rendering.
       */
      if ( rmesa->blend_flags ) {
	 return GL_FALSE;
      }
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			   ALPHA_COMB_MODULATE);	/* A = AfAt          */
	    } else {
	       combine |= (COLOR_COMB_ADD |		/* C = Cf+Ct         */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= (COLOR_COMB_MODULATE_NTEX |	/* C = Cf(1-Ct)      */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    } else {
	       combine |= (COLOR_COMB_ADD |		/* C = Cf+Ct         */
			   ALPHA_COMB_COPY_INPUT);	/* A = Af            */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_COPY_INPUT);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_ALPHA:
	 if ( unit == 0 ) {
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 } else {
	    combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
			ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 }
	 break;
      case GL_INTENSITY:
	 switch ( rmesa->env_color & 0x00ffffff ) {
	 case 0x00000000:
	    combine |= COLOR_COMB_MODULATE_NTEX;	/* C = Cf(1-It)      */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0x00ffffff:
	    if ( unit == 0 ) {
	       combine |= COLOR_COMB_MODULATE_NTEX;	/* C = Cf(1-It)      */
	    } else {
	       combine |= COLOR_COMB_ADD;		/* C = Cf+It         */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 switch ( rmesa->env_color & 0xff000000 ) {
	 case 0x00000000:
	    combine |= ALPHA_COMB_MODULATE_NTEX;	/* A = Af(1-It)      */
	    break;
#if 0
         /* This isn't right - BP */
	 case 0xff000000:
	    if ( unit == 0 ) {
	       combine |= ALPHA_COMB_MODULATE_NTEX;	/* A = Af(1-It)      */
	    } else {
	       combine |= ALPHA_COMB_ADD;		/* A = Af+It         */
	    }
	    break;
#endif
	 default:
	    combine |= (COLOR_COMB_MODULATE |		/* C = fallback      */
			ALPHA_COMB_MODULATE);		/* A = fallback      */
	    return GL_FALSE;
	 }
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   case GL_ADD:
      switch ( format ) {
      case GL_RGBA:
      case GL_LUMINANCE_ALPHA:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_RGB:
      case GL_LUMINANCE:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_COPY_INPUT);		/* A = Af            */
	 break;
      case GL_ALPHA:
	 combine |= (COLOR_COMB_COPY_INPUT |		/* C = Cf            */
		     ALPHA_COMB_MODULATE);		/* A = AfAt          */
	 break;
      case GL_INTENSITY:
	 combine |= (COLOR_COMB_ADD |			/* C = Cf+Ct         */
		     ALPHA_COMB_ADD);			/* A = Af+At         */
	 break;
      case GL_COLOR_INDEX:
      default:
	 return GL_FALSE;
      }
      break;

   default:
      return GL_FALSE;
   }

   if ( rmesa->tex_combine[unit] != combine ) {
     rmesa->tex_combine[unit] = combine;
     rmesa->dirty |= R128_UPLOAD_TEX0 << unit;
   }
   return GL_TRUE;
}

static void disable_tex( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);

   FLUSH_BATCH( rmesa );

   if ( rmesa->CurrentTexObj[unit] ) {
      rmesa->CurrentTexObj[unit]->base.bound &= ~(1 << unit);
      rmesa->CurrentTexObj[unit] = NULL;
   }

   rmesa->setup.tex_cntl_c &= ~(R128_TEXMAP_ENABLE << unit);
   rmesa->setup.tex_size_pitch_c &= ~(R128_TEX_SIZE_PITCH_MASK << 
				      (R128_SEC_TEX_SIZE_PITCH_SHIFT * unit));
   rmesa->dirty |= R128_UPLOAD_CONTEXT;

   /* If either texture unit is disabled, then multitexturing is not
    * happening.
    */

   rmesa->blend_flags &= ~R128_BLEND_MULTITEX;
}

static GLboolean enable_tex_2d( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;

   /* Need to load the 2d images associated with this unit.
    */
   if ( t->base.dirty_images[0] ) {
      /* FIXME: For Radeon, RADEON_FIREVERTICES is called here.  Should
       * FIXME: something similar be done for R128?
       */
      /*  FLUSH_BATCH( rmesa ); */

      r128SetTexImages( rmesa, tObj );
      r128UploadTexImages( rmesa, t );
      if ( !t->base.memBlock ) 
	  return GL_FALSE;
   }

   return GL_TRUE;
}

static GLboolean update_tex_common( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];
   const struct gl_texture_object *tObj = texUnit->_Current;
   r128TexObjPtr t = (r128TexObjPtr) tObj->DriverData;


   /* Fallback if there's a texture border */
   if ( tObj->Image[0][tObj->BaseLevel]->Border > 0 ) {
      return GL_FALSE;
   }


   /* Update state if this is a different texture object to last
    * time.
    */
   if ( rmesa->CurrentTexObj[unit] != t ) {
      if ( rmesa->CurrentTexObj[unit] != NULL ) {
	 /* The old texture is no longer bound to this texture unit.
	  * Mark it as such.
	  */

	 rmesa->CurrentTexObj[unit]->base.bound &= 
	     ~(1UL << unit);
      }

      rmesa->CurrentTexObj[unit] = t;
      t->base.bound |= (1UL << unit);
      rmesa->dirty |= R128_UPLOAD_TEX0 << unit;

      driUpdateTextureLRU( (driTextureObject *) t ); /* XXX: should be locked! */
   }

   /* FIXME: We need to update the texture unit if any texture parameters have
    * changed, but this texture was already bound.  This could be changed to
    * work like the Radeon driver where the texture object has it's own
    * dirty state flags
    */
   rmesa->dirty |= R128_UPLOAD_TEX0 << unit;

   /* register setup */
   rmesa->setup.tex_size_pitch_c &= ~(R128_TEX_SIZE_PITCH_MASK << 
				      (R128_SEC_TEX_SIZE_PITCH_SHIFT * unit));

   if ( unit == 0 ) {
      rmesa->setup.tex_cntl_c       |= R128_TEXMAP_ENABLE;
      rmesa->setup.tex_size_pitch_c |= t->setup.tex_size_pitch << 0;
      rmesa->setup.scale_3d_cntl    &= ~R128_TEX_CACHE_SPLIT;
      t->setup.tex_cntl             &= ~R128_SEC_SELECT_SEC_ST;
   }
   else {
      rmesa->setup.tex_cntl_c       |= R128_SEC_TEXMAP_ENABLE;
      rmesa->setup.tex_size_pitch_c |= t->setup.tex_size_pitch << 16;
      rmesa->setup.scale_3d_cntl    |= R128_TEX_CACHE_SPLIT;
      t->setup.tex_cntl             |=  R128_SEC_SELECT_SEC_ST;

      /* If the second TMU is enabled, then multitexturing is happening.
       */
      if ( R128_IS_PLAIN( rmesa ) )
	  rmesa->blend_flags            |= R128_BLEND_MULTITEX;
   }

   rmesa->dirty |= R128_UPLOAD_CONTEXT;


   /* FIXME: The Radeon has some cached state so that it can avoid calling
    * FIXME: UpdateTextureEnv in some cases.  Is that possible here?
    */
   return r128UpdateTextureEnv( ctx, unit );
}

static GLboolean updateTextureUnit( GLcontext *ctx, int unit )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   const int source = rmesa->tmu_source[unit];
   const struct gl_texture_unit *texUnit = &ctx->Texture.Unit[source];


   if (texUnit->_ReallyEnabled & (TEXTURE_1D_BIT | TEXTURE_2D_BIT)) {
      return (enable_tex_2d( ctx, unit ) &&
	      update_tex_common( ctx, unit ));
   }
   else if ( texUnit->_ReallyEnabled ) {
      return GL_FALSE;
   }
   else {
      disable_tex( ctx, unit );
      return GL_TRUE;
   }
}


void r128UpdateTextureState( GLcontext *ctx )
{
   r128ContextPtr rmesa = R128_CONTEXT(ctx);
   GLboolean ok;


   /* This works around a quirk with the R128 hardware.  If only OpenGL 
    * TEXTURE1 is enabled, then the hardware TEXTURE0 must be used.  The
    * hardware TEXTURE1 can ONLY be used when hardware TEXTURE0 is also used.
    */

   rmesa->tmu_source[0] = 0;
   rmesa->tmu_source[1] = 1;

   if ((ctx->Texture._EnabledUnits & 0x03) == 0x02) {
      /* only texture 1 enabled */
      rmesa->tmu_source[0] = 1;
      rmesa->tmu_source[1] = 0;
   }

   ok = (updateTextureUnit( ctx, 0 ) &&
	 updateTextureUnit( ctx, 1 ));

   FALLBACK( rmesa, R128_FALLBACK_TEXTURE, !ok );
}