summaryrefslogtreecommitdiff
path: root/driver/xf86-video-mga/src/mga_exa.c
blob: ced6452fe51938137ea0682b834f8558914514e9 (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
/*
 * Copyright 2006 Red Hat, Inc.
 *
 * 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
 * them 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 MERCHANTIBILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS 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:
 *    Adam Jackson <ajax@nwnk.net>
 *    Tilman Sauerbeck <tilman@code-monkey.de>
 */

/*
 * Sources:
 * - mga kdrive accel by Anders Carlsson
 * - mga g400 Render accel by Damien Ciabrini
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "xf86.h"

#include "mga.h"
#include "mga_reg.h"
#include "mga_macros.h"

#include "exa.h"
#ifdef MGADRI
#include "mga_dri.h"
#endif

#include "xf86PciInfo.h"

#if 0
#define DEBUG_MSG(x)  ErrorF x
#else
#define DEBUG_MSG(x)
#endif

#define PMGA(x) \
    MGAPtr pMga = xf86Screens[x->drawable.pScreen->myNum]->driverPrivate;

#define QUIESCE_DMA(x) \
    CHECK_DMA_QUIESCENT(pMga, xf86Screens[x->drawable.pScreen->myNum]);

/* stuff stolen from mga_storm.c */
#define BLIT_LEFT   1
#define BLIT_UP        4

/* FIXME
 * We could use MGADWG_BLK for GXcopy if HaveSDRAM is FALSE.
 * That will only work in some situations though (see mga_storm.c
 * for details).
 */
static const CARD32 mgaRop[16] = {
    /* GXclear        */  MGADWG_RPL  | 0x00000000,    /* 0 */
    /* GXand          */  MGADWG_RSTR | 0x00080000,    /* src AND dst */
    /* GXandReverse   */  MGADWG_RSTR | 0x00040000,    /* src AND NOT dst */
    /* GXcopy         */  MGADWG_RSTR | 0x000c0000,    /* src */
    /* GXandInverted  */  MGADWG_RSTR | 0x00020000,    /* NOT src AND dst */
    /* GXnoop         */  MGADWG_RSTR | 0x000a0000,    /* dst */
    /* GXxor          */  MGADWG_RSTR | 0x00060000,    /* src XOR dst */
    /* GXor           */  MGADWG_RSTR | 0x000e0000,    /* src OR dst */
    /* GXnor          */  MGADWG_RSTR | 0x00010000,    /* NOT src AND NOT dst */
    /* GXequiv        */  MGADWG_RSTR | 0x00090000,    /* NOT src XOR dst */
    /* GXinvert       */  MGADWG_RSTR | 0x00050000,    /* NOT dst */
    /* GXorReverse    */  MGADWG_RSTR | 0x000d0000,    /* src OR NOT dst */
    /* GXcopyInverted */  MGADWG_RPL  | 0x00030000,    /* NOT src */
    /* GXorInverted   */  MGADWG_RSTR | 0x000b0000,    /* NOT src OR dst */
    /* GXnand         */  MGADWG_RSTR | 0x00070000,    /* NOT src OR NOT dst */
    /* GXset          */  MGADWG_RPL  | 0x000f0000    /* 1 */
};

static const struct {
    Bool dst_alpha;
    Bool src_alpha;
    CARD32 blend_cntl;
} mgaBlendOp[] = {
    /* Clear */
    {0, 0, MGA_SRC_ZERO                | MGA_DST_ZERO},
    /* Src */
    {0, 0, MGA_SRC_ONE                 | MGA_DST_ZERO},
    /* Dst */
    {0, 0, MGA_SRC_ZERO                | MGA_DST_ONE},
    /* Over */
    {0, 1, MGA_SRC_ONE                 | MGA_DST_ONE_MINUS_SRC_ALPHA},
    /* OverReverse */
    {1, 0, MGA_SRC_ONE_MINUS_DST_ALPHA | MGA_DST_ONE},
    /* In */
    {1, 0, MGA_SRC_DST_ALPHA           | MGA_DST_ZERO},
    /* InReverse */
    {0, 1, MGA_SRC_ZERO                | MGA_DST_SRC_ALPHA},
    /* Out */
    {1, 0, MGA_SRC_ONE_MINUS_DST_ALPHA | MGA_DST_ZERO},
    /* OutReverse */
    {0, 1, MGA_SRC_ZERO                | MGA_DST_ONE_MINUS_SRC_ALPHA},
    /* Atop */
    {1, 1, MGA_SRC_DST_ALPHA           | MGA_DST_ONE_MINUS_SRC_ALPHA},
    /* AtopReverse */
    {1, 1, MGA_SRC_ONE_MINUS_DST_ALPHA | MGA_DST_SRC_ALPHA},
    /* Xor */
    {1, 1, MGA_SRC_ONE_MINUS_DST_ALPHA | MGA_DST_ONE_MINUS_SRC_ALPHA},
    /* Add */
    {0, 0, MGA_SRC_ONE                 | MGA_DST_ONE},
};

static CARD32
mgaGetPixmapPitch(PixmapPtr pPix)
{
    return exaGetPixmapPitch(pPix) / (pPix->drawable.bitsPerPixel >> 3);
}

static CARD32
mgaGetMACCESS(PixmapPtr pixmap, PicturePtr pict)
{
    switch (pixmap->drawable.bitsPerPixel) {
    case 8:
        return MGAMAC_PW8 | MGAMAC_BYPASS332 | MGAMAC_NODITHER;
    case 16:
        if (pict &&
            (pict->format == PICT_x1r5g5b5 || pict->format == PICT_a1r5g5b5))
            return MGAMAC_PW16 | MGAMAC_DIT555;
        else
            return MGAMAC_PW16;
    case 24:
        return MGAMAC_PW24;
    default:
        return MGAMAC_PW32;
    }
}

static Bool
mgaSetup(MGAPtr pMga, PixmapPtr pixmap, PicturePtr pict, int wait)
{
    WAITFIFO(wait + 4);

    /* Set the format of the destination pixmap */
    OUTREG(MGAREG_MACCESS, mgaGetMACCESS(pixmap, pict));

    OUTREG(MGAREG_CXBNDRY, 0xffff0000);
    OUTREG(MGAREG_YTOP, 0x00000000);
    OUTREG(MGAREG_YBOT, 0x007fffff);

    return TRUE;
}

static void
mgaNoopDone(PixmapPtr pPixmap)
{
}

static Bool
mgaPrepareSolid(PixmapPtr pPixmap, int alu, Pixel planemask, Pixel fg)
{
    PMGA(pPixmap);
    int dwgctl;

    /* FIXME
     * Is this needed here? We don't use DMA stuff here...
     */
    QUIESCE_DMA(pPixmap);

    /* We must pad planemask and fg depending on the format of the
     * destination pixmap
     */
    switch (pPixmap->drawable.bitsPerPixel) {
    case 8:
        fg |= fg << 8;
        planemask |= planemask << 8;
        /* fall through */
    case 16:
        fg |= fg << 16;
        planemask |= planemask << 16;
        break;
    }

    dwgctl = MGADWG_TRAP | MGADWG_SOLID | MGADWG_ARZERO |
             MGADWG_SGNZERO | MGADWG_SHIFTZERO | mgaRop[alu];

    mgaSetup(pMga, pPixmap, NULL, 5);

    OUTREG(MGAREG_PITCH, mgaGetPixmapPitch(pPixmap));
    OUTREG(MGAREG_DSTORG, exaGetPixmapOffset(pPixmap));
    OUTREG(MGAREG_FCOL, fg);
    OUTREG(MGAREG_PLNWT, planemask);
    OUTREG(MGAREG_DWGCTL, dwgctl);

    return TRUE;
}

static void
mgaSolid(PixmapPtr pPixmap, int x1, int y1, int x2, int y2)
{
    PMGA(pPixmap);

    WAITFIFO(2);
    OUTREG(MGAREG_FXBNDRY, (x2 << 16) | (x1 & 0xffff));
    OUTREG(MGAREG_YDSTLEN | MGAREG_EXEC, (y1 << 16) | (y2 - y1));
}

static Bool
mgaPrepareCopy(PixmapPtr pSrc, PixmapPtr pDst, int xdir, int ydir, int alu,
           Pixel planemask)
{
    PMGA(pSrc);
    int blit_direction = 0;
    int dwgctl = 0;

    /* FIXME
     * Is this needed here? We don't use DMA stuff here...
     */
    QUIESCE_DMA(pSrc);

    if (xdir < 0)
        blit_direction |= BLIT_LEFT;

    if (ydir < 0)
        blit_direction |= BLIT_UP;

    pMga->BltScanDirection = blit_direction;

    dwgctl = mgaRop[alu] | MGADWG_SHIFTZERO | MGADWG_BITBLT | MGADWG_BFCOL;
    pMga->src_pitch = mgaGetPixmapPitch(pSrc);

    mgaSetup(pMga, pDst, NULL, 7);
    OUTREG(MGAREG_PITCH, mgaGetPixmapPitch(pDst));
    OUTREG(MGAREG_SRCORG, exaGetPixmapOffset(pSrc));
    OUTREG(MGAREG_DSTORG, exaGetPixmapOffset(pDst));
    OUTREG(MGAREG_DWGCTL, dwgctl);
    OUTREG(MGAREG_SGN, blit_direction);
    OUTREG(MGAREG_PLNWT, planemask);
    OUTREG(MGAREG_AR5, (ydir < 0 ? -1 : 1) * pMga->src_pitch);

    return TRUE;
}

static void
mgaCopy(PixmapPtr pDst, int srcx, int srcy, int dstx, int dsty, int w, int h)
{
    PMGA(pDst);
    int start, end;

    w--;

    if (pMga->BltScanDirection & BLIT_UP) {
        srcy += h - 1;
        dsty += h - 1;
    }

    start = end = srcy * pMga->src_pitch + srcx;

    if (pMga->BltScanDirection & BLIT_LEFT)
        start += w;
    else
        end += w;

    WAITFIFO(4);
    OUTREG(MGAREG_AR0, end);
    OUTREG(MGAREG_AR3, start);
    OUTREG(MGAREG_FXBNDRY, ((dstx + w) << 16) | (dstx & 0xffff));
    OUTREG(MGAREG_YDSTLEN | MGAREG_EXEC, (dsty << 16) | h);
}

static int
MGA_LOG2(int val)
{
    int ret = 0;

    if (val == 1)
        return 0;

    while (val >> ret)
        ret++;

    return ((1 << (ret - 1)) == val) ? (ret - 1) : ret;
}

static CARD32
mgaGetTexFormat(PicturePtr pPict)
{
    static const struct {
        int fmt;
        CARD32 card_fmt;
    } *ptr, texformats[] = {
        { PICT_a8r8g8b8, MGA_TW32 },
        { PICT_x8r8g8b8, MGA_TW32 },
        { PICT_r5g6b5, MGA_TW16 },
        { PICT_a1r5g5b5, MGA_TW15 },
        { PICT_x1r5g5b5, MGA_TW15 },
        { PICT_a4r4g4b4, MGA_TW12 },
        { PICT_x4r4g4b4, MGA_TW12 },
        { PICT_a8, MGA_TW8A },
        { 0, 0}
    };

    for (ptr = texformats; ptr->fmt; ptr++)
        if (ptr->fmt == pPict->format)
            return ptr->card_fmt;

    return 0;
}

static Bool
mgaCheckSourceTexture(int tmu, PicturePtr pPict)
{
    int w = pPict->pDrawable->width;
    int h = pPict->pDrawable->height;

    if ((w > 2047) || (h > 2047)){
        DEBUG_MSG(("Picture w/h too large (%dx%d)\n", w, h));
        return FALSE;
    }

    if (!mgaGetTexFormat(pPict)) {
        DEBUG_MSG(("Unsupported picture format 0x%x\n", pPict->format));
        return FALSE;
    }

    if (pPict->repeatType != RepeatNormal) {
        DEBUG_MSG(("Unsupported repeat type %d\n", pPict->repeatType));
        return FALSE;
    }

    if (pPict->repeat && ((w & (w - 1)) != 0 || (h & (h - 1)) != 0)) {
        DEBUG_MSG(("NPOT repeat unsupported (%dx%d)\n", w, h));
        return FALSE;
    }

    if (pPict->filter != PictFilterNearest &&
        pPict->filter != PictFilterBilinear) {
        DEBUG_MSG(("Unsupported filter 0x%x\n", pPict->filter));
        return FALSE;
    }

    return TRUE;
}

static Bool
mgaCheckComposite(int op, PicturePtr pSrcPict, PicturePtr pMaskPict,
                  PicturePtr pDstPict)
{
    MGAPtr pMga = xf86Screens[pSrcPict->pDrawable->pScreen->myNum]->driverPrivate;

    if (op >= sizeof(mgaBlendOp) / sizeof(mgaBlendOp[0])) {
        DEBUG_MSG(("unsupported op %x\n", op));
        return FALSE;
    }

    if (!mgaCheckSourceTexture(0, pSrcPict))
        return FALSE;

    if (pMaskPict) {
        if (!mgaCheckSourceTexture(1, pMaskPict))
            return FALSE;

        if (pMaskPict->componentAlpha) {
            DEBUG_MSG(("Component alpha unsupported\n"));
            return FALSE;
        }
    }

    if (PICT_FORMAT_TYPE(pDstPict->format) == PICT_TYPE_ABGR) {
        DEBUG_MSG(("render to (A)BGR unsupported\n"));
        return FALSE;
    }

    /* Only the G550 can perform Add on A8 textures, it seems. */
    if (pMga->Chipset != PCI_CHIP_MGAG550 &&
        op == PictOpAdd && pSrcPict->format == PICT_a8 &&
        pDstPict->format == PICT_a8)
        return FALSE;

    return TRUE;
}

static void
PrepareSourceTexture(int tmu, PicturePtr pSrcPicture, PixmapPtr pSrc)
{
    PMGA(pSrc);
    int pitch = mgaGetPixmapPitch(pSrc);
    int w = pSrc->drawable.width;
    int h = pSrc->drawable.height;
    int w_log2 = MGA_LOG2(w);
    int h_log2 = MGA_LOG2(h);

    int texctl = MGA_PITCHLIN | ((pitch & (2048 - 1)) << 9) |
                 MGA_NOPERSPECTIVE | MGA_TAKEY;
    int texctl2 = MGA_G400_TC2_MAGIC | MGA_TC2_CKSTRANSDIS;
    int texfilter = MGA_FILTERALPHA | (0x10 << 21);

    texctl |= mgaGetTexFormat(pSrcPicture);

    if (pSrcPicture->filter == PictFilterBilinear)
        texfilter |= MGA_MAG_BILIN | MGA_MIN_BILIN;
    else
        texfilter |= MGA_MAG_NRST | MGA_MIN_NRST;

    if (!pSrcPicture->repeat)
        texctl |= MGA_CLAMPUV;

    if (tmu == 1)
        texctl2 |= MGA_TC2_DUALTEX | MGA_TC2_SELECT_TMU1;

    WAITFIFO(6);
    OUTREG(MGAREG_TEXCTL2, texctl2);
    OUTREG(MGAREG_TEXCTL, texctl);

    /* Source (texture) address + pitch */
    OUTREG(MGAREG_TEXORG, exaGetPixmapOffset(pSrc));
    OUTREG(MGAREG_TEXWIDTH, (w - 1) << 18 | ((8 - w_log2) & 63) << 9 | w_log2);
    OUTREG(MGAREG_TEXHEIGHT, (h - 1) << 18 | ((8 - h_log2) & 63) << 9 | h_log2);

    /* Set blit filtering flags */
    OUTREG(MGAREG_TEXFILTER, texfilter);

    if (tmu == 1) {
        WAITFIFO(1);
        OUTREG(MGAREG_TEXCTL2, texctl2 & ~MGA_TC2_SELECT_TMU1);
    }
}

/*
 *  The formals params are the elements of the following matrix:
 *
 *     Dest            Transform             Src
 *    coords                                coords
 *   / Xdst \   / X_incx X_incy X_init \   / Xsrc \
 *   | Ydst | = | Y_incx Y_incy Y_init | x | Ysrc |
 *   \  1   /   \ H_incx H_incy H_init /   \  1   /
 *
 * matrix elements are 32bits fixed points (16.16)
 * mga_fx_* is the size of the fixed point for the TMU
 */
static void
setTMIncrementsRegs(PixmapPtr pPix, int X_incx, int X_incy, int X_init,
                    int Y_incx, int Y_incy, int Y_init,
                    int H_incx, int H_incy, int H_init,
                    int mga_fx_width_size, int mga_fx_height_size)
{
    PMGA(pPix);

    int decalw = mga_fx_width_size - 16;
    int decalh = mga_fx_height_size - 16;

    /* Convert 16 bits fixpoint -> MGA variable size fixpoint */
    if (decalw >= 0) {
        X_incx <<= decalw;
        X_incy <<= decalw;
        X_init <<= decalw;
    } else {
        decalw = -decalw;
        X_incx >>= decalw;
        X_incy >>= decalw;
        X_init >>= decalw;
    }

    /* Convert 16 bits fixpoint -> MGA variable size fixpoint */
    if (decalh >= 0) {
        Y_incx <<= decalh;
        Y_incy <<= decalh;
        Y_init <<= decalh;
    } else {
        decalh = -decalh;
        Y_incx >>= decalh;
        Y_incy >>= decalh;
        Y_init >>= decalh;
    }

    /* Set TM registers */
    WAITFIFO(9);
    OUTREG(MGAREG_TMR0, X_incx);
    OUTREG(MGAREG_TMR1, Y_incx);
    OUTREG(MGAREG_TMR2, X_incy);
    OUTREG(MGAREG_TMR3, Y_incy);
    OUTREG(MGAREG_TMR4, H_incx);
    OUTREG(MGAREG_TMR5, H_incy);
    OUTREG(MGAREG_TMR6, X_init);
    OUTREG(MGAREG_TMR7, Y_init);
    OUTREG(MGAREG_TMR8, H_init);
}

/* XXX these look like magic */
#define C_ARG1_CUR              0x0
#define C_ARG1_ALPHA            MGA_TDS_COLOR_ARG1_REPLICATEALPHA
#define C_ARG2_DIFFUSE          MGA_TDS_COLOR_ARG2_DIFFUSE
#define C_ARG2_FCOL             MGA_TDS_COLOR_ARG2_FCOL
#define C_ARG2_PREV             MGA_TDS_COLOR_ARG2_PREVSTAGE
#define C_ARG1_INV              MGA_TDS_COLOR_ARG1_INV
#define C_ARG2_INV              MGA_TDS_COLOR_ARG2_INV
#define COLOR_MUL               MGA_TDS_COLOR_SEL_MUL
#define COLOR_ARG1              MGA_TDS_COLOR_SEL_ARG1
#define COLOR_ARG2              MGA_TDS_COLOR_SEL_ARG2
#define A_ARG1_CUR              0x0
#define A_ARG2_IGN              A_ARG2_DIFFUSE
#define A_ARG2_FCOL             MGA_TDS_ALPHA_ARG2_FCOL
#define A_ARG2_DIFFUSE          MGA_TDS_ALPHA_ARG2_DIFFUSE
#define A_ARG2_PREV             MGA_TDS_ALPHA_ARG2_PREVSTAGE
#define ALPHA_MUL               MGA_TDS_ALPHA_SEL_MUL
#define ALPHA_ARG1              MGA_TDS_ALPHA_SEL_ARG1
#define ALPHA_ARG2              MGA_TDS_ALPHA_SEL_ARG2

static Bool
mgaPrepareComposite(int op, PicturePtr pSrcPict, PicturePtr pMaskPict,
                    PicturePtr pDstPict, PixmapPtr pSrc, PixmapPtr pMask,
                    PixmapPtr pDst)
{
    PMGA(pDst);
    CARD32 fcol = 0xff000000, ds0 = 0, ds1 = 0, cmd, blendcntl;

    mgaSetup(pMga, pDst, pDstPict, 2);
    OUTREG(MGAREG_DSTORG, exaGetPixmapOffset(pDst));
    OUTREG(MGAREG_PITCH, mgaGetPixmapPitch(pDst));

    PrepareSourceTexture(0, pSrcPict, pSrc);

    if (pMask)
        PrepareSourceTexture(1, pMaskPict, pMask);
    else
        PrepareSourceTexture(1, pSrcPict, pSrc);

    /* For A8 writes, the desired alpha value needs to be replicated
     * to the color channels - if the source texture doesn't have an
     * alpha channel, set it to 0xff instead.
     * Otherwise, use the color channels if available, or set them
     * to black.
     */
    if (pDstPict->format == PICT_a8 && !PICT_FORMAT_A(pSrcPict->format)) {
        fcol = 0xffffffff;
        ds0 |= C_ARG2_FCOL | COLOR_ARG2; /* C = 0xff */
    } else if (pDstPict->format == PICT_a8)
        ds0 |= C_ARG1_ALPHA | COLOR_ARG1; /* C = As */
    else if (pSrcPict->format == PICT_a8)
        ds0 |= C_ARG2_FCOL | COLOR_ARG2; /* C = 0 */
    else
        ds0 |= C_ARG1_CUR | COLOR_ARG1; /* C = Cs */

    /* If the source texture has an alpha channel, use it.
     * Otherwise, set the alpha channel to 0xff (see FCOL setting above).
     */
    if (PICT_FORMAT_A(pSrcPict->format))
        ds0 |= A_ARG1_CUR | ALPHA_ARG1; /* A = As */
    else
        ds0 |= A_ARG2_FCOL | ALPHA_ARG2; /* A = 0xff */

    if (!pMask)
        ds1 = ds0;
    else {
        /* As or Am might be NULL. in this case we don't multiply because,
         * the alpha component holds garbage.
         */
        if (!PICT_FORMAT_A(pMaskPict->format))
            ds1 |= C_ARG2_PREV | COLOR_ARG2; /* C = Cs */
        else
            ds1 |= C_ARG1_ALPHA | C_ARG2_PREV | COLOR_MUL; /* C = Am * Cs */

        if (!PICT_FORMAT_A(pMaskPict->format))
            ds1 |= A_ARG2_PREV | ALPHA_ARG2; /* A = As */
        else if (!PICT_FORMAT_A(pSrcPict->format))
            ds1 |= A_ARG1_CUR | ALPHA_ARG1; /* A = Am */
        else
            ds1 |= A_ARG1_CUR | A_ARG2_PREV | ALPHA_MUL; /* A = Am * As */
    }

    cmd = MGADWG_TEXTURE_TRAP | MGADWG_I | 0x000c0000 |
          MGADWG_SHIFTZERO | MGADWG_SGNZERO | MGADWG_ARZERO;
    blendcntl = mgaBlendOp[op].blend_cntl;

    if (!PICT_FORMAT_A(pDstPict->format) && mgaBlendOp[op].dst_alpha) {
        int sblend = blendcntl & MGA_SRC_BLEND_MASK;

        if (sblend == MGA_SRC_DST_ALPHA)
            blendcntl = (blendcntl & ~MGA_SRC_BLEND_MASK) | MGA_SRC_ONE;
        else if (sblend == MGA_SRC_ONE_MINUS_DST_ALPHA)
            blendcntl = (blendcntl & ~MGA_SRC_BLEND_MASK) | MGA_SRC_ZERO;
    }

    WAITFIFO(5);
    OUTREG(MGAREG_FCOL, fcol);
    OUTREG(MGAREG_TDUALSTAGE0, ds0);
    OUTREG(MGAREG_TDUALSTAGE1, ds1);
    OUTREG(MGAREG_DWGCTL, cmd);
    OUTREG(MGAREG_ALPHACTRL, MGA_ALPHACHANNEL | blendcntl);

    pMga->currentSrcPicture = pSrcPict;
    pMga->currentMaskPicture = pMaskPict;
    pMga->currentSrc = pSrc;
    pMga->currentMask = pMask;

    pMga->src_w2 = MGA_LOG2 (pSrc->drawable.width);
    pMga->src_h2 = MGA_LOG2 (pSrc->drawable.height);

    if (pMask) {
        pMga->mask_w2 = MGA_LOG2 (pMask->drawable.width);
        pMga->mask_h2 = MGA_LOG2 (pMask->drawable.height);
    }

    return TRUE;
}

static void
mgaComposite(PixmapPtr pDst, int srcx, int srcy, int maskx, int masky,
             int dstx, int dsty, int w, int h)
{
    PMGA(pDst);
    PictTransformPtr t;
    int texctl2;

    srcx %= pMga->currentSrc->drawable.width;
    srcy %= pMga->currentSrc->drawable.height;

    if (pMga->currentMask) {
        maskx %= pMga->currentMask->drawable.width;
        masky %= pMga->currentMask->drawable.height;
    }

    t = pMga->currentSrcPicture->transform;

    if (t)
        setTMIncrementsRegs(pMga->currentSrc,
                            t->matrix[0][0],
                            t->matrix[0][1],
                            t->matrix[0][2] + (srcx << 16),
                            t->matrix[1][0],
                            t->matrix[1][1],
                            t->matrix[1][2] + (srcy << 16),
                            t->matrix[2][0],
                            t->matrix[2][1],
                            t->matrix[2][2],
                            20 - pMga->src_w2,
                            20 - pMga->src_h2);
    else
        setTMIncrementsRegs(pMga->currentSrc,
                            1 << 16, 0, srcx << 16,
                            0, 1 << 16, srcy << 16,
                            0, 0, 1 << 16,
                            20 - pMga->src_w2,
                            20 - pMga->src_h2);

    if (pMga->currentMask) {
        texctl2 = MGA_G400_TC2_MAGIC | MGA_TC2_CKSTRANSDIS | MGA_TC2_DUALTEX;

        WAITFIFO(1);
        OUTREG(MGAREG_TEXCTL2, texctl2 | MGA_TC2_SELECT_TMU1);

        t = pMga->currentMaskPicture->transform;

        if (t)
            setTMIncrementsRegs(pMga->currentMask,
                                t->matrix[0][0],
                                t->matrix[0][1],
                                t->matrix[0][2] + (maskx << 16),
                                t->matrix[1][0],
                                t->matrix[1][1],
                                t->matrix[1][2] + (masky << 16),
                                t->matrix[2][0],
                                t->matrix[2][1],
                                t->matrix[2][2],
                                20 - pMga->mask_w2,
                                20 - pMga->mask_h2);
        else
            setTMIncrementsRegs(pMga->currentMask,
                                1 << 16, 0, maskx << 16,
                                0, 1 << 16, masky << 16,
                                0, 0, 1 << 16,
                                20 - pMga->mask_w2,
                                20 - pMga->mask_h2);

        WAITFIFO(1);
        OUTREG(MGAREG_TEXCTL2, texctl2 & ~MGA_TC2_SELECT_TMU1);
    }

    WAITFIFO(2);
    OUTREG(MGAREG_FXBNDRY, ((dstx + w) << 16) | (dstx & 0xffff));
    OUTREG(MGAREG_YDSTLEN | MGAREG_EXEC, (dsty << 16) | (h & 0xffff));
}

static Bool
mgaUploadToScreen(PixmapPtr pDst, int x, int y, int w, int h,
                  char *src, int src_pitch)
{
    PMGA(pDst);
    int bytes_padded = ((pDst->drawable.bitsPerPixel * w + 31) / 32) * 4;

    QUIESCE_DMA(pDst);

    mgaSetup(pMga, pDst, NULL, 10);

    OUTREG(MGAREG_OPMODE, MGAOPM_DMA_BLIT);
    OUTREG(MGAREG_DSTORG, exaGetPixmapOffset(pDst));
    OUTREG(MGAREG_PITCH, mgaGetPixmapPitch(pDst));
    OUTREG(MGAREG_PLNWT, 0xffffffff);
    OUTREG(MGAREG_DWGCTL, MGADWG_ILOAD | MGADWG_BFCOL |
           MGADWG_SGNZERO | MGADWG_SHIFTZERO |
           MGADWG_RSTR | 0x000c0000);
    OUTREG(MGAREG_AR0, w - 1);
    OUTREG(MGAREG_AR3, 0);
    OUTREG(MGAREG_AR5, 0);
    OUTREG(MGAREG_FXBNDRY, ((x + w - 1) << 16) | (x & 0xffff));
    OUTREG(MGAREG_YDSTLEN | MGAREG_EXEC, (y << 16) | (h & 0xffff));

    while (h--) {
        memcpy (pMga->ILOADBase, src, bytes_padded);
        src += src_pitch;
    }

    exaMarkSync(pDst->drawable.pScreen);

    return TRUE;
}

static Bool
mgaDownloadFromScreen(PixmapPtr pSrc, int x, int y, int w, int h,
                      char *dst, int dst_pitch)
{
    PMGA(pSrc);

    char *src = pSrc->devPrivate.ptr;
    int src_pitch = exaGetPixmapPitch(pSrc);

    int cpp = (pSrc->drawable.bitsPerPixel + 7) / 8;
    int bytes = w * cpp;

    src += y * src_pitch + x * cpp;

    QUIESCE_DMA(pSrc);

    while (h--) {
	memcpy (dst, src, bytes);
	src += src_pitch;
	dst += dst_pitch;
    }

    return TRUE;
}

static void
mgaWaitMarker(ScreenPtr pScreen, int marker)
{
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    MGAPtr pMga = pScrn->driverPrivate;

    WAITFIFO(1);

    OUTREG(MGAREG_CACHEFLUSH, 0);

    /* wait until the "drawing engine busy" bit is unset */
    while (INREG (MGAREG_Status) & 0x10000);
}

#ifdef MGADRI
static void
init_dri(ScrnInfoPtr pScrn)
{
    MGAPtr pMga = MGAPTR(pScrn);
    MGADRIServerPrivatePtr dri = pMga->DRIServerInfo;
    int cpp = pScrn->bitsPerPixel / 8;
    int widthBytes = pScrn->displayWidth * cpp;
    int bufferSize = ((pScrn->virtualY * widthBytes + MGA_BUFFER_ALIGN)
                      & ~MGA_BUFFER_ALIGN);
    int maxlines, mb;

    switch (pMga->Chipset) {
    case PCI_CHIP_MGAG200_SE_A_PCI:
    case PCI_CHIP_MGAG200_SE_B_PCI:
        mb = 1;
	break;
    default:
        mb = 16;
	break;
    }

    maxlines = (min(pMga->FbUsableSize, mb * 1024 * 1024)) /
               (pScrn->displayWidth * pMga->CurrentLayout.bitsPerPixel / 8);

    dri->frontOffset = 0;
    dri->frontPitch = widthBytes;

    /* Try for front, back, depth, and two framebuffers worth of
     * pixmap cache.  Should be enough for a fullscreen background
     * image plus some leftovers.
     */
    dri->textureSize = pMga->FbMapSize - 5 * bufferSize;

    /* If that gives us less than half the available memory, let's
     * be greedy and grab some more.  Sorry, I care more about 3D
     * performance than playing nicely, and you'll get around a full
     * framebuffer's worth of pixmap cache anyway.
     */
    if (dri->textureSize < (int)pMga->FbMapSize / 2) {
        dri->textureSize = pMga->FbMapSize - 4 * bufferSize;
    }

    /* Check to see if there is more room available after the maximum
     * scanline for textures.
     */
    if ((int) pMga->FbMapSize - maxlines * widthBytes - bufferSize * 2
        > dri->textureSize) {
        dri->textureSize = pMga->FbMapSize - maxlines * widthBytes -
                           bufferSize * 2;
    }

    /* Set a minimum usable local texture heap size.  This will fit
     * two 256x256x32bpp textures.
     */
    if (dri->textureSize < 512 * 1024) {
        dri->textureOffset = 0;
        dri->textureSize = 0;
    }

    /* Reserve space for textures */
    dri->textureOffset = (pMga->FbMapSize - dri->textureSize +
                          MGA_BUFFER_ALIGN) & ~MGA_BUFFER_ALIGN;

    /* Reserve space for the shared depth buffer */
    dri->depthOffset = (dri->textureOffset - bufferSize +
                        MGA_BUFFER_ALIGN) & ~MGA_BUFFER_ALIGN;
    dri->depthPitch = widthBytes;

    /* Reserve space for the shared back buffer */
    dri->backOffset = (dri->depthOffset - bufferSize +
                       MGA_BUFFER_ALIGN) & ~MGA_BUFFER_ALIGN;
    dri->backPitch = widthBytes;
}
#endif /* MGADRI */

Bool
mgaExaInit(ScreenPtr pScreen)
{
    ExaDriverPtr pExa;
    ScrnInfoPtr pScrn = xf86Screens[pScreen->myNum];
    MGAPtr pMga = pScrn->driverPrivate;

    pExa = exaDriverAlloc();
    if (!pExa) {
        pMga->NoAccel = TRUE;
        return FALSE;
    }

    pMga->ExaDriver = pExa;

    pExa->exa_major = EXA_VERSION_MAJOR;
    pExa->exa_minor = EXA_VERSION_MINOR;

    pExa->flags = EXA_OFFSCREEN_PIXMAPS | EXA_OFFSCREEN_ALIGN_POT;
    pExa->memoryBase = pMga->FbStart;
    pExa->memorySize = pMga->FbUsableSize - 4096;
    pExa->offScreenBase = (pScrn->virtualX * pScrn->virtualY *
                           pScrn->bitsPerPixel / 8) + 4096;

    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "X %d Y %d bpp %d\n",
               pScrn->virtualX, pScrn->virtualY, pScrn->bitsPerPixel);
    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "Start at %p, size %lx, osb %lx\n",
               pExa->memoryBase, pExa->memorySize, pExa->offScreenBase);

    /* In PW24 mode, we need to align to "3 64-bytes" */
    pExa->pixmapOffsetAlign = 192;

    /* Pitch alignment is in sets of 32 pixels, and we need to cover
     * 32bpp, so it's 128 bytes.
     */
    pExa->pixmapPitchAlign = 128;

    pExa->maxX = 2048;
    pExa->maxY = 2048;

    pExa->WaitMarker = mgaWaitMarker;
    pExa->PrepareSolid = mgaPrepareSolid;
    pExa->Solid = mgaSolid;
    pExa->DoneSolid = mgaNoopDone;
    pExa->PrepareCopy = mgaPrepareCopy;
    pExa->Copy = mgaCopy;
    pExa->DoneCopy = mgaNoopDone;

    if (pMga->Chipset == PCI_CHIP_MGAG400 ||
        pMga->Chipset == PCI_CHIP_MGAG550) {
        pExa->CheckComposite = mgaCheckComposite;
        pExa->PrepareComposite = mgaPrepareComposite;
        pExa->Composite = mgaComposite;
        pExa->DoneComposite = mgaNoopDone;
    }

    pExa->UploadToScreen = mgaUploadToScreen;
    pExa->DownloadFromScreen = mgaDownloadFromScreen;

#ifdef MGADRI
    if (pMga->directRenderingEnabled)
        init_dri(pScrn);
#endif

    return exaDriverInit(pScreen, pExa);
}