summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/mga/mgapixel.c
blob: 38577f05edde4c54bb502fd908f2df4a91bd8835 (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
/*
 * Copyright 2000 Compaq Computer Inc. and VA Linux Systems, Inc.
 * 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
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * \file mgapixel.c
 * Implement framebuffer pixel operations for MGA.
 *
 * \todo
 * Someday the accelerated \c glReadPixels and \c glDrawPixels paths need to
 * be resurrected.  They are currently ifdef'ed out because they don't seem
 * to work and they only get activated some very rare circumstances.
 *
 * \author Keith Whitwell <keith@tungstengraphics.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */
/* $XFree86: xc/lib/GL/mesa/src/drv/mga/mgapixel.c,v 1.9 2002/11/05 17:46:08 tsi Exp $ */

#include "mtypes.h"
#include "macros.h"
#include "mgadd.h"
#include "mgacontext.h"
#include "mgaioctl.h"
#include "mgapixel.h"
#include "mgastate.h"

#include "swrast/swrast.h"
#include "imports.h"

#if 0
#define IS_AGP_MEM( mmesa, p )						  \
   ((unsigned long)mmesa->mgaScreen->buffers.map <= ((unsigned long)p) && \
    (unsigned long)mmesa->mgaScreen->buffers.map +			  \
    (unsigned long)mmesa->mgaScreen->buffers.size > ((unsigned long)p))
#define AGP_OFFSET( mmesa, p )						  \
     (((unsigned long)p) - (unsigned long)mmesa->mgaScreen->buffers.map)


#if defined(MESA_packed_depth_stencil)
static GLboolean
check_depth_stencil_24_8( const GLcontext *ctx, GLenum type,
			  const struct gl_pixelstore_attrib *packing,
			  const void *pixels, GLint sz,
			  GLint pitch )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   return ( type == GL_UNSIGNED_INT_24_8_MESA &&
	    ctx->Visual->DepthBits == 24 &&
	    ctx->Visual->StencilBits == 8 &&
	    mmesa->mgaScreen->cpp == 4 &&
	    mmesa->hw_stencil &&
	    !ctx->Pixel.IndexShift &&
	    !ctx->Pixel.IndexOffset &&
	    !ctx->Pixel.MapStencilFlag &&
	    ctx->Pixel.DepthBias == 0.0 &&
	    ctx->Pixel.DepthScale == 1.0 &&
	    !packing->SwapBytes &&
	    pitch % 32 == 0 &&
	    pitch < 4096 );
}
#endif


static GLboolean
check_depth( const GLcontext *ctx, GLenum type,
	     const struct gl_pixelstore_attrib *packing,
	     const void *pixels, GLint sz, GLint pitch )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   if ( IS_AGP_MEM( mmesa, pixels ) &&
	!( ( type == GL_UNSIGNED_INT && mmesa->mgaScreen->cpp == 4 ) ||
	   ( type == GL_UNSIGNED_SHORT && mmesa->mgaScreen->cpp == 2 ) ) )
      return GL_FALSE;

   return ( ctx->Pixel.DepthBias == 0.0 &&
	    ctx->Pixel.DepthScale == 1.0 &&
	    !packing->SwapBytes &&
	    pitch % 32 == 0 &&
	    pitch < 4096 );
}


static GLboolean
check_color( const GLcontext *ctx, GLenum type, GLenum format,
	     const struct gl_pixelstore_attrib *packing,
	     const void *pixels, GLint sz, GLint pitch )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLuint cpp = mmesa->mgaScreen->cpp;

   /* Can't do conversions on agp reads/draws.
    */
   if ( IS_AGP_MEM( mmesa, pixels ) &&
	!( pitch % 32 == 0 && pitch < 4096 &&
	   ( ( type == GL_UNSIGNED_BYTE &&
	       cpp == 4 && format == GL_BGRA ) ||
	     ( type == GL_UNSIGNED_INT_8_8_8_8 &&
	       cpp == 4 && format == GL_BGRA ) ||
	     ( type == GL_UNSIGNED_SHORT_5_6_5_REV &&
	       cpp == 2 && format == GL_RGB ) ) ) )
      return GL_FALSE;

   return (!ctx->_ImageTransferState &&
	   !packing->SwapBytes &&
	   !packing->LsbFirst);
}

static GLboolean
check_color_per_fragment_ops( const GLcontext *ctx )
{
   return (!(       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->Current.RasterPosValid &&
	   ctx->Pixel.ZoomX == 1.0F &&
	   (ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F));
}

static GLboolean
check_depth_per_fragment_ops( const GLcontext *ctx )
{
   return ( ctx->Current.RasterPosValid &&
	    ctx->Color.ColorMask[RCOMP] == 0 &&
	    ctx->Color.ColorMask[BCOMP] == 0 &&
	    ctx->Color.ColorMask[GCOMP] == 0 &&
	    ctx->Color.ColorMask[ACOMP] == 0 &&
	    ctx->Pixel.ZoomX == 1.0F &&
	    ( ctx->Pixel.ZoomY == 1.0F || ctx->Pixel.ZoomY == -1.0F ) );
}

/* In addition to the requirements for depth:
 */
#if defined(MESA_packed_depth_stencil)
static GLboolean
check_stencil_per_fragment_ops( const GLcontext *ctx )
{
   return ( !ctx->Pixel.IndexShift &&
	    !ctx->Pixel.IndexOffset );
}
#endif


static GLboolean
clip_pixelrect( const GLcontext *ctx,
		const GLframebuffer *buffer,
		GLint *x, GLint *y,
		GLsizei *width, GLsizei *height,
		GLint *skipPixels, GLint *skipRows,
		GLint *size )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);

   *width = MIN2(*width, MAX_WIDTH); /* redundant? */

   /* left clipping */
   if (*x < buffer->_Xmin) {
      *skipPixels += (buffer->_Xmin - *x);
      *width -= (buffer->_Xmin - *x);
      *x = buffer->_Xmin;
   }

   /* right clipping */
   if (*x + *width > buffer->_Xmax)
      *width -= (*x + *width - buffer->_Xmax - 1);

   if (*width <= 0)
      return GL_FALSE;

   /* bottom clipping */
   if (*y < buffer->_Ymin) {
      *skipRows += (buffer->_Ymin - *y);
      *height -= (buffer->_Ymin - *y);
      *y = buffer->_Ymin;
   }

   /* top clipping */
   if (*y + *height > buffer->_Ymax)
      *height -= (*y + *height - buffer->_Ymax - 1);

   if (*height <= 0)
      return GL_FALSE;

   *size = ((*y + *height - 1) * mmesa->mgaScreen->frontPitch +
	    (*x + *width - 1) * mmesa->mgaScreen->cpp);

   return GL_TRUE;
}

static GLboolean
mgaTryReadPixels( GLcontext *ctx,
		  GLint x, GLint y, GLsizei width, GLsizei height,
		  GLenum format, GLenum type,
		  const struct gl_pixelstore_attrib *pack,
		  GLvoid *pixels )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLint size, skipPixels, skipRows;
   GLint pitch = pack->RowLength ? pack->RowLength : width;
   GLboolean ok;

   GLuint planemask;
   GLuint source;
#if 0
   drmMGABlit blit;
   GLuint dest;
   GLint source_pitch, dest_pitch;
   GLint delta_sx, delta_sy;
   GLint delta_dx, delta_dy;
   GLint blit_height, ydir;
#endif

   if (!clip_pixelrect(ctx, ctx->ReadBuffer,
		       &x, &y, &width, &height,
		       &skipPixels, &skipRows, &size)) {
      return GL_TRUE;
   }

   /* Only accelerate reading to agp buffers.
    */
   if ( !IS_AGP_MEM(mmesa, (char *)pixels) ||
	!IS_AGP_MEM(mmesa, (char *)pixels + size) )
      return GL_FALSE;

   switch (format) {
#if defined(MESA_packed_depth_stencil)
   case GL_DEPTH_STENCIL_MESA:
      ok = check_depth_stencil_24_8(ctx, type, pack, pixels, size, pitch);
      planemask = ~0;
      source = mmesa->mgaScreen->depthOffset;
      break;
#endif

   case GL_DEPTH_COMPONENT:
      ok = check_depth(ctx, type, pack, pixels, size, pitch);

      /* Can't accelerate at this depth -- planemask does the wrong
       * thing; it doesn't clear the low order bits in the
       * destination, instead it leaves them untouched.
       *
       * Could get the acclerator to solid fill the destination with
       * zeros first...  Or get the cpu to do it...
       */
      if (ctx->Visual.depthBits == 24)
	 return GL_FALSE;

      planemask = ~0;
      source = mmesa->mgaScreen->depthOffset;
      break;

   case GL_RGB:
   case GL_BGRA:
      ok = check_color(ctx, type, format, pack, pixels, size, pitch);
      planemask = ~0;
      source = (mmesa->draw_buffer == MGA_FRONT ?
		mmesa->mgaScreen->frontOffset :
		mmesa->mgaScreen->backOffset);
      break;

   default:
      return GL_FALSE;
   }

   if (!ok) {
      return GL_FALSE;
   }


   LOCK_HARDWARE( mmesa );

#if 0
   {
      __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
      int nbox, retcode, i;

      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );

      if (mmesa->dirty_cliprects & MGA_FRONT)
	 mgaUpdateRects( mmesa, MGA_FRONT );

      nbox = dPriv->numClipRects;

      y = dPriv->h - y - height;
      x += mmesa->drawX;
      y += mmesa->drawY;

      dest = ((mmesa->mgaScreen->agp.handle + AGP_OFFSET(mmesa, pixels)) |
	      DO_dstmap_sys | DO_dstacc_agp);
      source_pitch = mmesa->mgaScreen->frontPitch / mmesa->mgaScreen->cpp;
      dest_pitch = pitch;
      delta_sx = 0;
      delta_sy = 0;
      delta_dx = -x;
      delta_dy = -y;
      blit_height = 2*y + height;
      ydir = -1;

      if (0) fprintf(stderr, "XX doing readpixel blit src_pitch %d dst_pitch %d\n",
		     source_pitch, dest_pitch);



      for (i = 0 ; i < nbox ; )
      {
	 int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, dPriv->numClipRects);
	 drm_clip_rect_t *box = dPriv->pClipRects;
	 drm_clip_rect_t *b = mmesa->sarea->boxes;
	 int n = 0;

	 for ( ; i < nr ; i++) {
	    GLint bx = box[i].x1;
	    GLint by = box[i].y1;
	    GLint bw = box[i].x2 - bx;
	    GLint bh = box[i].y2 - by;

	    if (bx < x) bw -= x - bx, bx = x;
	    if (by < y) bh -= y - by, by = y;
	    if (bx + bw > x + width) bw = x + width - bx;
	    if (by + bh > y + height) bh = y + height - by;
	    if (bw <= 0) continue;
	    if (bh <= 0) continue;

	    b->x1 = bx;
	    b->y1 = by;
	    b->x2 = bx + bw;
	    b->y2 = by + bh;
	    b++;
	    n++;
	 }

	 mmesa->sarea->nbox = n;

	 if (n && (retcode = drmCommandWrite( mmesa->driFd, DRM_MGA_BLIT,
                                              &blit, sizeof(drmMGABlit)))) {
	    fprintf(stderr, "blit ioctl failed, retcode = %d\n", retcode);
	    UNLOCK_HARDWARE( mmesa );
	    exit(1);
	 }
      }

      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
   }
#endif

   UNLOCK_HARDWARE( mmesa );

   return GL_TRUE;
}

static void
mgaDDReadPixels( GLcontext *ctx,
		 GLint x, GLint y, GLsizei width, GLsizei height,
		 GLenum format, GLenum type,
		 const struct gl_pixelstore_attrib *pack,
		 GLvoid *pixels )
{
   if (!mgaTryReadPixels( ctx, x, y, width, height, format, type, pack, pixels))
      _swrast_ReadPixels( ctx, x, y, width, height, format, type, pack, pixels);
}




static void do_draw_pix( GLcontext *ctx,
			 GLint x, GLint y, GLsizei width, GLsizei height,
			 GLint pitch,
			 const void *pixels,
			 GLuint dest, GLuint planemask)
{
#if 0
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   drmMGABlit blit;
   __DRIdrawablePrivate *dPriv = mmesa->driDrawable;
   drm_clip_rect_t pbox = dPriv->pClipRects;
   int nbox = dPriv->numClipRects;
   int retcode, i;

   y = dPriv->h - y - height;
   x += mmesa->drawX;
   y += mmesa->drawY;

   blit.dest = dest;
   blit.planemask = planemask;
   blit.source = ((mmesa->mgaScreen->agp.handle + AGP_OFFSET(mmesa, pixels))
		  | SO_srcmap_sys | SO_srcacc_agp);
   blit.dest_pitch = mmesa->mgaScreen->frontPitch / mmesa->mgaScreen->cpp;
   blit.source_pitch = pitch;
   blit.delta_sx = -x;
   blit.delta_sy = -y;
   blit.delta_dx = 0;
   blit.delta_dy = 0;
   if (ctx->Pixel.ZoomY == -1) {
      blit.height = height;
      blit.ydir = 1;
   } else {
      blit.height = height;
      blit.ydir = -1;
   }

   if (0) fprintf(stderr,
		  "doing drawpixel blit src_pitch %d dst_pitch %d\n",
		  blit.source_pitch, blit.dest_pitch);

   for (i = 0 ; i < nbox ; )
   {
      int nr = MIN2(i + MGA_NR_SAREA_CLIPRECTS, dPriv->numClipRects);
      drm_clip_rect_t *box = mmesa->pClipRects;
      drm_clip_rect_t *b = mmesa->sarea->boxes;
      int n = 0;

      for ( ; i < nr ; i++) {
	 GLint bx = box[i].x1;
	 GLint by = box[i].y1;
	 GLint bw = box[i].x2 - bx;
	 GLint bh = box[i].y2 - by;

	 if (bx < x) bw -= x - bx, bx = x;
	 if (by < y) bh -= y - by, by = y;
	 if (bx + bw > x + width) bw = x + width - bx;
	 if (by + bh > y + height) bh = y + height - by;
	 if (bw <= 0) continue;
	 if (bh <= 0) continue;

	 b->x1 = bx;
	 b->y1 = by;
	 b->x2 = bx + bw;
	 b->y2 = by + bh;
	 b++;
	 n++;
      }

      mmesa->sarea->nbox = n;

      if (n && (retcode = drmCommandWrite( mmesa->driFd, DRM_MGA_BLIT,
                                              &blit, sizeof(drmMGABlit)))) {
	 fprintf(stderr, "blit ioctl failed, retcode = %d\n", retcode);
	 UNLOCK_HARDWARE( mmesa );
	 exit(1);
      }
   }
#endif
}




static GLboolean
mgaTryDrawPixels( GLcontext *ctx,
		  GLint x, GLint y, GLsizei width, GLsizei height,
		  GLenum format, GLenum type,
		  const struct gl_pixelstore_attrib *unpack,
		  const GLvoid *pixels )
{
   mgaContextPtr mmesa = MGA_CONTEXT(ctx);
   GLint size, skipPixels, skipRows;
   GLint pitch = unpack->RowLength ? unpack->RowLength : width;
   GLuint dest, planemask;
   GLuint cpp = mmesa->mgaScreen->cpp;

   if (!clip_pixelrect(ctx, ctx->DrawBuffer,
		       &x, &y, &width, &height,
		       &skipPixels, &skipRows, &size)) {
      return GL_TRUE;
   }


   switch (format) {
#if defined(MESA_packed_depth_stencil)
   case GL_DEPTH_STENCIL_MESA:
      dest = mmesa->mgaScreen->depthOffset;
      planemask = ~0;
      if (!check_depth_stencil_24_8(ctx, type, unpack, pixels, size, pitch) ||
	  !check_depth_per_fragment_ops(ctx) ||
	  !check_stencil_per_fragment_ops(ctx))
	 return GL_FALSE;
      break;
#endif

   case GL_DEPTH_COMPONENT:
      dest = mmesa->mgaScreen->depthOffset;

      if (ctx->Visual.depthBits == 24)
	 planemask = ~0xff;
      else
	 planemask = ~0;

      if (!check_depth(ctx, type, unpack, pixels, size, pitch) ||
	  !check_depth_per_fragment_ops(ctx))
	 return GL_FALSE;
      break;

   case GL_RGB:
   case GL_BGRA:
      dest = (mmesa->draw_buffer == MGA_FRONT ?
	      mmesa->mgaScreen->frontOffset :
	      mmesa->mgaScreen->backOffset);

      planemask = mgaPackColor(cpp,
			       ctx->Color.ColorMask[RCOMP],
			       ctx->Color.ColorMask[GCOMP],
			       ctx->Color.ColorMask[BCOMP],
			       ctx->Color.ColorMask[ACOMP]);

      if (cpp == 2)
	 planemask |= planemask << 16;

      if (!check_color(ctx, type, format, unpack, pixels, size, pitch)) {
	 return GL_FALSE;
      }
      if (!check_color_per_fragment_ops(ctx)) {
	 return GL_FALSE;
      }
      break;

   default:
      return GL_FALSE;
   }

   LOCK_HARDWARE_QUIESCENT( mmesa );

   if (mmesa->dirty_cliprects & MGA_FRONT)
      mgaUpdateRects( mmesa, MGA_FRONT );

   if ( IS_AGP_MEM(mmesa, (char *)pixels) &&
	IS_AGP_MEM(mmesa, (char *)pixels + size) )
   {
      do_draw_pix( ctx, x, y, width, height, pitch, pixels,
		   dest, planemask );
      UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );
   }
   else
   {
      /* Pixels is in regular memory -- get dma buffers and perform
       * upload through them.
       */
/*        drmBufPtr buf = mgaGetBufferLocked(mmesa); */
      GLuint bufferpitch = (width*cpp+31)&~31;

      char *address = 0; /*  mmesa->mgaScreen->agp.map; */

      do {
/*  	 GLuint rows = MIN2( height, MGA_DMA_BUF_SZ / bufferpitch ); */
	 GLuint rows = height;


	 if (0) fprintf(stderr, "trying to upload %d rows (pitch %d)\n",
			rows, bufferpitch);

	 /* The texture conversion code is so slow that there is only
	  * negligble speedup when the buffers/images don't exactly
	  * match:
	  */
#if 0
	 if (cpp == 2) {
	    if (!_mesa_convert_texsubimage2d( MESA_FORMAT_RGB565,
					      0, 0, width, rows,
					      bufferpitch, format, type,
					      unpack, pixels, address )) {
/*  	       mgaReleaseBufLocked( mmesa, buf ); */
	       UNLOCK_HARDWARE(mmesa);
	       return GL_FALSE;
	    }
	 } else {
	    if (!_mesa_convert_texsubimage2d( MESA_FORMAT_ARGB8888,
					      0, 0, width, rows,
					      bufferpitch, format, type,
					      unpack, pixels, address )) {
/*  	       mgaReleaseBufLocked( mmesa, buf ); */
	       UNLOCK_HARDWARE(mmesa);
	       return GL_FALSE;
	    }
	 }
#else
	 MEMCPY( address, pixels, rows*bufferpitch );
#endif

	 do_draw_pix( ctx, x, y, width, rows,
		      bufferpitch/cpp, address, dest, planemask );

	 /* Fix me -- use multiple buffers to avoid flush.
	  */
	 UPDATE_LOCK( mmesa, DRM_LOCK_FLUSH | DRM_LOCK_QUIESCENT );

	 pixels = (void *)((char *) pixels + rows * pitch);
	 height -= rows;
	 y += rows;
      } while (height);

/*        mgaReleaseBufLocked( mmesa, buf ); */
   }

   UNLOCK_HARDWARE( mmesa );
   mmesa->dirty |= MGA_UPLOAD_CLIPRECTS;

   return GL_TRUE;
}

static void
mgaDDDrawPixels( GLcontext *ctx,
		 GLint x, GLint y, GLsizei width, GLsizei height,
		 GLenum format, GLenum type,
		 const struct gl_pixelstore_attrib *unpack,
		 const GLvoid *pixels )
{
   if (!mgaTryDrawPixels( ctx, x, y, width, height, format, type,
			  unpack, pixels ))
      _swrast_DrawPixels( ctx, x, y, width, height, format, type,
			  unpack, pixels );
}
#endif


/* Stub functions - not a real allocator, always returns pointer to
 * the same block of agp space which isn't used for anything else at
 * present.
 */
void mgaDDInitPixelFuncs( GLcontext *ctx )
{
   /* 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;

#if 0
   if (getenv("MGA_BLIT_PIXELS")) {
      ctx->Driver.ReadPixels = mgaDDReadPixels; /* requires agp dest */
      ctx->Driver.DrawPixels = mgaDDDrawPixels; /* works with agp/normal mem */
   }
#endif
}