aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa/src/mesa/drivers/dri/trident/trident_state.c
blob: 76b2a8ef3c903309c43827b3dbb27305eb72ae97 (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
/*
 * Copyright 2002 by Alan Hourihane, Sychdyn, North Wales, UK.
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation, and that the name of Alan Hourihane not be used in
 * advertising or publicity pertaining to distribution of the software without
 * specific, written prior permission.  Alan Hourihane makes no representations
 * about the suitability of this software for any purpose.  It is provided
 * "as is" without express or implied warranty.
 *
 * ALAN HOURIHANE DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL ALAN HOURIHANE BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
 * PERFORMANCE OF THIS SOFTWARE.
 *
 * Authors:  Alan Hourihane, <alanh@fairlite.demon.co.uk>
 *
 * Trident CyberBladeXP driver.
 *
 */
#include "trident_context.h"
#include "trident_lock.h"
#include "array_cache/acache.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "framebuffer.h"

#define TRIDENTPACKCOLOR332(r, g, b)					\
   (((r) & 0xe0) | (((g) & 0xe0) >> 3) | (((b) & 0xc0) >> 6))

#define TRIDENTPACKCOLOR1555(r, g, b, a)					\
   ((((r) & 0xf8) << 7) | (((g) & 0xf8) << 2) | (((b) & 0xf8) >> 3) |	\
    ((a) ? 0x8000 : 0))

#define TRIDENTPACKCOLOR565(r, g, b)					\
   ((((r) & 0xf8) << 8) | (((g) & 0xfc) << 3) | (((b) & 0xf8) >> 3))

#define TRIDENTPACKCOLOR888(r, g, b)					\
   (((r) << 16) | ((g) << 8) | (b))

#define TRIDENTPACKCOLOR8888(r, g, b, a)					\
   (((a) << 24) | ((r) << 16) | ((g) << 8) | (b))

#define TRIDENTPACKCOLOR4444(r, g, b, a)					\
   ((((a) & 0xf0) << 8) | (((r) & 0xf0) << 4) | ((g) & 0xf0) | ((b) >> 4))

static __inline__ GLuint tridentPackColor( GLuint cpp,
					  GLubyte r, GLubyte g,
					  GLubyte b, GLubyte a )
{
   switch ( cpp ) {
   case 2:
      return TRIDENTPACKCOLOR565( r, g, b );
   case 4:
      return TRIDENTPACKCOLOR8888( r, g, b, a );
   default:
      return 0;
   }
}

void tridentUploadHwStateLocked( tridentContextPtr tmesa )
{
   unsigned char *MMIO = tmesa->tridentScreen->mmio.map;
#if 0
   ATISAREAPrivPtr sarea = tmesa->sarea;
   trident_context_regs_t *regs = &(sarea->ContextState);
#endif

   if ( tmesa->dirty & TRIDENT_UPLOAD_COMMAND_D ) {
      MMIO_OUT32(MMIO, 0x00281C, tmesa->commandD );
      tmesa->dirty &= ~TRIDENT_UPLOAD_COMMAND_D;
   }

   if ( tmesa->dirty & TRIDENT_UPLOAD_CLIPRECTS ) {
      /* XXX FIX ME ! */
      MMIO_OUT32(MMIO, 0x002C80 , 0x20008000 | tmesa->tridentScreen->height );    
      MMIO_OUT32(MMIO, 0x002C84 , 0x20000000 | tmesa->tridentScreen->width );    
      tmesa->dirty &= ~TRIDENT_UPLOAD_CLIPRECTS;
   }

   tmesa->dirty = 0;
}

/* Copy the back color buffer to the front color buffer.
 */
void tridentCopyBuffer( const __DRIdrawablePrivate *dPriv )
{
   unsigned char *MMIO;
   tridentContextPtr tmesa;
   GLint nbox, i;
   int busy;
   drm_clip_rect_t *pbox;

   assert(dPriv);
   assert(dPriv->driContextPriv);
   assert(dPriv->driContextPriv->driverPrivate);

   tmesa = (tridentContextPtr) dPriv->driContextPriv->driverPrivate;
   MMIO = tmesa->tridentScreen->mmio.map;

   LOCK_HARDWARE( tmesa );

   /* use front buffer cliprects */
   nbox = dPriv->numClipRects;
   pbox = dPriv->pClipRects;

   for ( i = 0 ; i < nbox ; i++ ) {
#if 0
      GLint nr = MIN2( i + MACH64_NR_SAREA_CLIPRECTS , nbox );
      drm_clip_rect_t *b = tmesa->sarea->boxes;
      GLint n = 0;

      for ( ; i < nr ; i++ ) {
	 *b++ = pbox[i];
	 n++;
      }
      tmesa->sarea->nbox = n;
#endif

    MMIO_OUT32(MMIO, 0x2150, tmesa->tridentScreen->frontPitch << 20 | tmesa->tridentScreen->frontOffset>>4);
    MMIO_OUT32(MMIO, 0x2154, tmesa->tridentScreen->backPitch << 20 | tmesa->tridentScreen->backOffset>>4);
    MMIO_OUT8(MMIO, 0x2127, 0xCC); /* Copy Rop */
    MMIO_OUT32(MMIO, 0x2128, 0x4); /* scr2scr */
    MMIO_OUT32(MMIO, 0x2138, (pbox->x1 << 16) | pbox->y1);
    MMIO_OUT32(MMIO, 0x213C, (pbox->x1 << 16) | pbox->y1);
    MMIO_OUT32(MMIO, 0x2140, (pbox->x2 - pbox->x1) << 16 | (pbox->y2 - pbox->y1) );
    MMIO_OUT8(MMIO, 0x2124, 0x01); /* BLT */
#define GE_BUSY 0x80
    for (;;) {
	busy = MMIO_IN8(MMIO, 0x2120);
	if ( !(busy & GE_BUSY) )
		break;
    }
   }

   UNLOCK_HARDWARE( tmesa );

#if 0
   tmesa->dirty |= (MACH64_UPLOAD_CONTEXT |
		    MACH64_UPLOAD_MISC |
		    MACH64_UPLOAD_CLIPRECTS);
#endif
}


static void tridentDDClear( GLcontext *ctx, GLbitfield mask, GLboolean all,
			       GLint cx, GLint cy, GLint cw, GLint ch )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);
   unsigned char *MMIO = tmesa->tridentScreen->mmio.map;
   int busy;
   GLuint flags = 0;
   GLint i;

#define DRM_TRIDENT_FRONT	0x01
#define DRM_TRIDENT_BACK	0x02
#define DRM_TRIDENT_DEPTH	0x04

   if ( tmesa->new_state )
      tridentDDUpdateHWState( ctx );

   if ( mask & BUFFER_BIT_FRONT_LEFT ) {
      flags |= DRM_TRIDENT_FRONT;
      mask &= ~BUFFER_BIT_FRONT_LEFT;
   }

   if ( mask & BUFFER_BIT_BACK_LEFT ) {
      flags |= DRM_TRIDENT_BACK;
      mask &= ~BUFFER_BIT_BACK_LEFT;
   }

   if ( ( mask & BUFFER_BIT_DEPTH ) && ctx->Depth.Mask ) {
      flags |= DRM_TRIDENT_DEPTH;
      mask &= ~BUFFER_BIT_DEPTH;
   }

   LOCK_HARDWARE(tmesa);

   if ( flags ) {
   
      cx += tmesa->drawX;
      cy += tmesa->drawY;
   
      /* HACK!!!
       */
      if ( tmesa->dirty & ~TRIDENT_UPLOAD_CLIPRECTS ) {
         tridentUploadHwStateLocked( tmesa );
      }
   
      for ( i = 0 ; i < tmesa->numClipRects ; i++ ) {
#if 0
         int nr = MIN2( i + TRIDENT_NR_SAREA_CLIPRECTS, tmesa->numClipRects );
         drm_clip_rect_t *box = tmesa->pClipRects;
         drm_clip_rect_t *b = tmesa->sarea->boxes;
         GLint n = 0;
   
         if ( !all ) {
	    for ( ; i < nr ; i++ ) {
	       GLint x = box[i].x1;
	       GLint y = box[i].y1;
	       GLint w = box[i].x2 - x;
	       GLint h = box[i].y2 - y;
	       
	       if ( x < cx ) w -= cx - x, x = cx;
	       if ( y < cy ) h -= cy - y, y = cy;
	       if ( x + w > cx + cw ) w = cx + cw - x;
	       if ( y + h > cy + ch ) h = cy + ch - y;
	       if ( w <= 0 ) continue;
	       if ( h <= 0 ) continue;
	       
	       b->x1 = x;
	       b->y1 = y;
	       b->x2 = x + w;
	       b->y2 = y + h;
	       b++;
	       n++;
	    }
         } else {
	    for ( ; i < nr ; i++ ) {
	       *b++ = box[i];
	       n++;
	    }
         }
   
         tmesa->sarea->nbox = n;
#endif
   
if (flags & DRM_TRIDENT_BACK) {
    MMIO_OUT32(MMIO, 0x2150, tmesa->tridentScreen->backPitch << 20 | tmesa->tridentScreen->backOffset>>4);
         MMIO_OUT8(MMIO, 0x2127, 0xF0); /* Pat Rop */
         MMIO_OUT32(MMIO, 0x2158, tmesa->ClearColor);
         MMIO_OUT32(MMIO, 0x2128, 0x4000); /* solidfill */
         MMIO_OUT32(MMIO, 0x2138, cx << 16 | cy);
         MMIO_OUT32(MMIO, 0x2140, cw << 16 | ch);
         MMIO_OUT8(MMIO, 0x2124, 0x01); /* BLT */
#define GE_BUSY 0x80
	 for (;;) {
		busy = MMIO_IN8(MMIO, 0x2120);
		if ( !(busy & GE_BUSY) )
			break;
	 }
}
if (flags & DRM_TRIDENT_DEPTH) {
    MMIO_OUT32(MMIO, 0x2150, tmesa->tridentScreen->depthPitch << 20 | tmesa->tridentScreen->depthOffset>>4);
         MMIO_OUT8(MMIO, 0x2127, 0xF0); /* Pat Rop */
         MMIO_OUT32(MMIO, 0x2158, tmesa->ClearColor);
         MMIO_OUT32(MMIO, 0x2128, 0x4000); /* solidfill */
         MMIO_OUT32(MMIO, 0x2138, cx << 16 | cy);
         MMIO_OUT32(MMIO, 0x2140, cw << 16 | ch);
         MMIO_OUT8(MMIO, 0x2124, 0x01); /* BLT */
#define GE_BUSY 0x80
	 for (;;) {
		busy = MMIO_IN8(MMIO, 0x2120);
		if ( !(busy & GE_BUSY) )
			break;
	 }
}
    MMIO_OUT32(MMIO, 0x2150, tmesa->tridentScreen->frontPitch << 20 | tmesa->tridentScreen->frontOffset>>4);
if (flags & DRM_TRIDENT_FRONT) {
         MMIO_OUT8(MMIO, 0x2127, 0xF0); /* Pat Rop */
         MMIO_OUT32(MMIO, 0x2158, tmesa->ClearColor);
         MMIO_OUT32(MMIO, 0x2128, 0x4000); /* solidfill */
         MMIO_OUT32(MMIO, 0x2138, cx << 16 | cy);
         MMIO_OUT32(MMIO, 0x2140, cw << 16 | ch);
         MMIO_OUT8(MMIO, 0x2124, 0x01); /* BLT */
#define GE_BUSY 0x80
	 for (;;) {
		busy = MMIO_IN8(MMIO, 0x2120);
		if ( !(busy & GE_BUSY) )
			break;
	 }
}
   
      }
   
#if 0
      tmesa->dirty |= (TRIDENT_UPLOAD_CONTEXT |
   		       TRIDENT_UPLOAD_MISC |
   		       TRIDENT_UPLOAD_CLIPRECTS);
#endif
   }

   UNLOCK_HARDWARE(tmesa);

   if ( mask )
      _swrast_Clear( ctx, mask, all, cx, cy, cw, ch );
}

static void tridentDDShadeModel( GLcontext *ctx, GLenum mode )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);
   GLuint s = tmesa->commandD;

#define TRIDENT_FLAT_SHADE 			0x000000E0
#define TRIDENT_FLAT_SHADE_VERTEX_C		0x00000060
#define TRIDENT_FLAT_SHADE_GOURAUD		0x00000080

   s &= ~TRIDENT_FLAT_SHADE;

   switch ( mode ) {
   case GL_FLAT:
      s |= TRIDENT_FLAT_SHADE_VERTEX_C;
      break;
   case GL_SMOOTH:
      s |= TRIDENT_FLAT_SHADE_GOURAUD;
      break;
   default:
      return;
   }

   if ( tmesa->commandD != s ) {
      tmesa->commandD = s;

      tmesa->dirty |= TRIDENT_UPLOAD_COMMAND_D;
   }
}

void tridentCalcViewport( GLcontext *ctx )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);
   const GLfloat *v = ctx->Viewport._WindowMap.m;
   GLfloat *m = tmesa->hw_viewport;

   /* See also trident_translate_vertex.
    */
   m[MAT_SX] =   v[MAT_SX];
   m[MAT_TX] =   v[MAT_TX] + tmesa->drawX + SUBPIXEL_X;
   m[MAT_SY] = - v[MAT_SY];
   m[MAT_TY] = - v[MAT_TY] + tmesa->driDrawable->h + tmesa->drawY + SUBPIXEL_Y;
#if 0
   m[MAT_SZ] =   v[MAT_SZ] * tmesa->depth_scale;
   m[MAT_TZ] =   v[MAT_TZ] * tmesa->depth_scale;
#else
   m[MAT_SZ] =   v[MAT_SZ];
   m[MAT_TZ] =   v[MAT_TZ];
#endif

   tmesa->SetupNewInputs = ~0;
}

static void tridentDDViewport( GLcontext *ctx,
			  GLint x, GLint y,
			  GLsizei width, GLsizei height )
{
   tridentCalcViewport( ctx );
}

static void tridentDDDepthRange( GLcontext *ctx,
			    GLclampd nearval, GLclampd farval )
{
   tridentCalcViewport( ctx );
}

void tridentSetCliprects( tridentContextPtr tmesa, GLenum mode )
{
   __DRIdrawablePrivate *dPriv = tmesa->driDrawable;

   switch ( mode ) {
   case GL_FRONT_LEFT:
      if (dPriv->numClipRects == 0) {
	 static drm_clip_rect_t zeroareacliprect = {0,0,0,0};
	 tmesa->numClipRects = 1;
	 tmesa->pClipRects = &zeroareacliprect;
      } else {
	 tmesa->numClipRects = dPriv->numClipRects;
	 tmesa->pClipRects = (drm_clip_rect_t *)dPriv->pClipRects;
      }
      tmesa->drawX = dPriv->x;
      tmesa->drawY = dPriv->y;
      break;
   case GL_BACK_LEFT:
      if ( dPriv->numBackClipRects == 0 ) {
	  if (dPriv->numClipRects == 0) {
	     static drm_clip_rect_t zeroareacliprect = {0,0,0,0};
	     tmesa->numClipRects = 1;
	     tmesa->pClipRects = &zeroareacliprect;
	  } else {
	     tmesa->numClipRects = dPriv->numClipRects;
	     tmesa->pClipRects = (drm_clip_rect_t *)dPriv->pClipRects;
	     tmesa->drawX = dPriv->x;
	     tmesa->drawY = dPriv->y;
	  }
      }
      else {
	 tmesa->numClipRects = dPriv->numBackClipRects;
	 tmesa->pClipRects = (drm_clip_rect_t *)dPriv->pBackClipRects;
	 tmesa->drawX = dPriv->backX;
	 tmesa->drawY = dPriv->backY;
      }
      break;
   default:
      return;
   }

#if 0
   tmesa->dirty |= TRIDENT_UPLOAD_CLIPRECTS;
#endif
}

#if 0
static GLboolean tridentDDSetDrawBuffer( GLcontext *ctx, GLenum mode )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);
   int found = GL_TRUE;

   if ( tmesa->DrawBuffer != mode ) {
      tmesa->DrawBuffer = mode;
      
      switch ( mode ) {
      case GL_FRONT_LEFT:
	 tridentFallback( tmesa, TRIDENT_FALLBACK_DRAW_BUFFER, GL_FALSE );
	 tmesa->drawOffset = tmesa->tridentScreen->frontOffset;
	 tmesa->drawPitch  = tmesa->tridentScreen->frontPitch;
	 tridentSetCliprects( tmesa, GL_FRONT_LEFT );
	 break;
      case GL_BACK_LEFT:
	 tridentFallback( tmesa, TRIDENT_FALLBACK_DRAW_BUFFER, GL_FALSE );
	 tmesa->drawOffset = tmesa->tridentScreen->backOffset;
	 tmesa->drawPitch  = tmesa->tridentScreen->backPitch;
	 tridentSetCliprects( tmesa, GL_BACK_LEFT );
	 break;
      default:
	 tridentFallback( tmesa, TRIDENT_FALLBACK_DRAW_BUFFER, GL_TRUE );
	 found = GL_FALSE;
	 break;
      }

#if 0
      tmesa->setup.dst_off_pitch = (((tmesa->drawPitch/8) << 22) |
				    (tmesa->drawOffset >> 3));

      tmesa->dirty |= MACH64_UPLOAD_DST_OFF_PITCH | MACH64_UPLOAD_CONTEXT;
#endif
      
   }

   return found;
}

static void tridentDDClearColor( GLcontext *ctx,
				const GLchan color[4] )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);

   tmesa->ClearColor = tridentPackColor( tmesa->tridentScreen->cpp,
					color[0], color[1], 
					color[2], color[3] );
}
#endif

void tridentDDUpdateState( GLcontext *ctx, GLuint new_state )
{
   _swrast_InvalidateState( ctx, new_state );
   _swsetup_InvalidateState( ctx, new_state );
   _ac_InvalidateState( ctx, new_state );
   _tnl_InvalidateState( ctx, new_state );
   TRIDENT_CONTEXT(ctx)->new_gl_state |= new_state;
}


/* Initialize the context's hardware state.
 */
void tridentDDInitState( tridentContextPtr tmesa )
{
   tmesa->new_state = 0;

   switch ( tmesa->glCtx->Visual.depthBits ) {
   case 16:
      tmesa->depth_scale = 1.0 / (GLfloat)0xffff;
      break;
   case 24:
      tmesa->depth_scale = 1.0 / (GLfloat)0xffffff;
      break;
   }
}

void tridentDDUpdateHWState( GLcontext *ctx )
{
   tridentContextPtr tmesa = TRIDENT_CONTEXT(ctx);
   int new_state = tmesa->new_state;

   if ( new_state )
   {
      tmesa->new_state = 0;

#if 0
      /* Update the various parts of the context's state.
       */
      if ( new_state & GAMMA_NEW_ALPHA )
	 tridentUpdateAlphaMode( ctx );

      if ( new_state & GAMMA_NEW_DEPTH )
	 tridentUpdateZMode( ctx );

      if ( new_state & GAMMA_NEW_FOG )
	 gammaUpdateFogAttrib( ctx );

      if ( new_state & GAMMA_NEW_CLIP )
	 gammaUpdateClipping( ctx );

      if ( new_state & GAMMA_NEW_POLYGON )
	 gammaUpdatePolygon( ctx );

      if ( new_state & GAMMA_NEW_CULL )
	 gammaUpdateCull( ctx );

      if ( new_state & GAMMA_NEW_MASKS )
	 gammaUpdateMasks( ctx );

      if ( new_state & GAMMA_NEW_STIPPLE )
	 gammaUpdateStipple( ctx );
#endif
   }

   /* HACK ! */

#if 0
   gammaEmitHwState( tmesa );
#endif
}

/* Initialize the driver's state functions.
 */
void tridentDDInitStateFuncs( GLcontext *ctx )
{
   ctx->Driver.UpdateState		= tridentDDUpdateState;

   ctx->Driver.Clear			= tridentDDClear;
   ctx->Driver.DepthRange		= tridentDDDepthRange;
   ctx->Driver.ShadeModel		= tridentDDShadeModel;
   ctx->Driver.Viewport			= tridentDDViewport;

   /* Pixel path fallbacks.
    */
   ctx->Driver.Accum = _swrast_Accum;
   ctx->Driver.Bitmap = _swrast_Bitmap;
   ctx->Driver.CopyPixels = _swrast_CopyPixels;
   ctx->Driver.DrawPixels = _swrast_DrawPixels;
   ctx->Driver.ReadPixels = _swrast_ReadPixels;
   ctx->Driver.ResizeBuffers = _mesa_resize_framebuffer;

   /* Swrast hooks for imaging extensions:
    */
   ctx->Driver.CopyColorTable = _swrast_CopyColorTable;
   ctx->Driver.CopyColorSubTable = _swrast_CopyColorSubTable;
   ctx->Driver.CopyConvolutionFilter1D = _swrast_CopyConvolutionFilter1D;
   ctx->Driver.CopyConvolutionFilter2D = _swrast_CopyConvolutionFilter2D;
}