summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/ffb/ffb_xmesa.c
blob: 00bdcec7a6963c205982510d913e2705d88e16a8 (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
/* 
 *
 * GLX Hardware Device Driver for Sun Creator/Creator3D
 * Copyright (C) 2000, 2001 David S. Miller
 *
 * 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, sublicense,
 * 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 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * DAVID MILLER, OR ANY OTHER CONTRIBUTORS 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.
 *
 *
 *    David S. Miller <davem@redhat.com>
 */

#include "ffb_xmesa.h"
#include "main/context.h"
#include "main/framebuffer.h"
#include "main/matrix.h"
#include "main/renderbuffer.h"
#include "main/simple_list.h"
#include "main/imports.h"
#include "utils.h"

#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "tnl/t_pipeline.h"
#include "vbo/vbo.h"
#include "drivers/common/driverfuncs.h"

#include "ffb_context.h"
#include "ffb_dd.h"
#include "ffb_span.h"
#include "ffb_depth.h"
#include "ffb_stencil.h"
#include "ffb_clear.h"
#include "ffb_vb.h"
#include "ffb_tris.h"
#include "ffb_lines.h"
#include "ffb_points.h"
#include "ffb_state.h"
#include "ffb_tex.h"
#include "ffb_lock.h"
#include "ffb_vtxfmt.h"
#include "ffb_bitmap.h"

#include "drm_sarea.h"

#include "drirenderbuffer.h"

static GLboolean
ffbInitDriver(__DRIscreenPrivate *sPriv)
{
	ffbScreenPrivate *ffbScreen;
	FFBDRIPtr gDRIPriv = (FFBDRIPtr) sPriv->pDevPriv;
	drmAddress map;

	if (getenv("LIBGL_FORCE_XSERVER"))
		return GL_FALSE;


   	if (sPriv->devPrivSize != sizeof(FFBDRIRec)) {
      		fprintf(stderr,"\nERROR!  sizeof(FFBDRIRec) does not match passed size from device driver\n");
      		return GL_FALSE;
   	}

	/* Allocate the private area. */
	ffbScreen = (ffbScreenPrivate *) MALLOC(sizeof(ffbScreenPrivate));
	if (!ffbScreen)
		return GL_FALSE;

	/* Map FBC registers. */
	if (drmMap(sPriv->fd,
		   gDRIPriv->hFbcRegs,
		   gDRIPriv->sFbcRegs,
		   &map)) {
	        FREE(ffbScreen);
		return GL_FALSE;
	}
	ffbScreen->regs = (ffb_fbcPtr) map;

	/* Map ramdac registers. */
	if (drmMap(sPriv->fd,
		   gDRIPriv->hDacRegs,
		   gDRIPriv->sDacRegs,
		   &map)) {
		drmUnmap((drmAddress)ffbScreen->regs, gDRIPriv->sFbcRegs);
		FREE(ffbScreen);
		return GL_FALSE;
	}
	ffbScreen->dac = (ffb_dacPtr) map;

	/* Map "Smart" framebuffer views. */
	if (drmMap(sPriv->fd,
		   gDRIPriv->hSfb8r,
		   gDRIPriv->sSfb8r,
		   &map)) {
		drmUnmap((drmAddress)ffbScreen->regs, gDRIPriv->sFbcRegs);
		drmUnmap((drmAddress)ffbScreen->dac, gDRIPriv->sDacRegs);
		FREE(ffbScreen);
		return GL_FALSE;
	}
	ffbScreen->sfb8r = (volatile char *) map;

	if (drmMap(sPriv->fd,
		   gDRIPriv->hSfb32,
		   gDRIPriv->sSfb32,
		   &map)) {
		drmUnmap((drmAddress)ffbScreen->regs, gDRIPriv->sFbcRegs);
		drmUnmap((drmAddress)ffbScreen->dac, gDRIPriv->sDacRegs);
		drmUnmap((drmAddress)ffbScreen->sfb8r, gDRIPriv->sSfb8r);
		FREE(ffbScreen);
		return GL_FALSE;
	}
	ffbScreen->sfb32 = (volatile char *) map;

	if (drmMap(sPriv->fd,
		   gDRIPriv->hSfb64,
		   gDRIPriv->sSfb64,
		   &map)) {
		drmUnmap((drmAddress)ffbScreen->regs, gDRIPriv->sFbcRegs);
		drmUnmap((drmAddress)ffbScreen->dac, gDRIPriv->sDacRegs);
		drmUnmap((drmAddress)ffbScreen->sfb8r, gDRIPriv->sSfb8r);
		drmUnmap((drmAddress)ffbScreen->sfb32, gDRIPriv->sSfb32);
		FREE(ffbScreen);
		return GL_FALSE;
	}
	ffbScreen->sfb64 = (volatile char *) map;

	ffbScreen->fifo_cache = 0;
	ffbScreen->rp_active = 0;

	ffbScreen->sPriv = sPriv;
	sPriv->private = (void *) ffbScreen;

	ffbDDLinefuncInit();
	ffbDDPointfuncInit();

	return GL_TRUE;
}


static void
ffbDestroyScreen(__DRIscreenPrivate *sPriv)
{
	ffbScreenPrivate *ffbScreen = sPriv->private;
	FFBDRIPtr gDRIPriv = (FFBDRIPtr) sPriv->pDevPriv;

	drmUnmap((drmAddress)ffbScreen->regs, gDRIPriv->sFbcRegs);
	drmUnmap((drmAddress)ffbScreen->dac, gDRIPriv->sDacRegs);
	drmUnmap((drmAddress)ffbScreen->sfb8r, gDRIPriv->sSfb8r);
	drmUnmap((drmAddress)ffbScreen->sfb32, gDRIPriv->sSfb32);
	drmUnmap((drmAddress)ffbScreen->sfb64, gDRIPriv->sSfb64);

	FREE(ffbScreen);
}

static const struct tnl_pipeline_stage *ffb_pipeline[] = {
   &_tnl_vertex_transform_stage, 
   &_tnl_normal_transform_stage, 
   &_tnl_lighting_stage,
				/* REMOVE: fog coord stage */
   &_tnl_texgen_stage, 
   &_tnl_texture_transform_stage, 
				/* REMOVE: point attenuation stage */
   &_tnl_render_stage,		
   0,
};

/* Create and initialize the Mesa and driver specific context data */
static GLboolean
ffbCreateContext(const __GLcontextModes *mesaVis,
                 __DRIcontextPrivate *driContextPriv,
                 void *sharedContextPrivate)
{
	ffbContextPtr fmesa;
	GLcontext *ctx, *shareCtx;
	__DRIscreenPrivate *sPriv;
	ffbScreenPrivate *ffbScreen;
	char *debug;
	struct dd_function_table functions;

        /* Allocate ffb context */
	fmesa = (ffbContextPtr) CALLOC(sizeof(ffbContextRec));
	if (!fmesa)
		return GL_FALSE;

	_mesa_init_driver_functions(&functions);

        /* Allocate Mesa context */
        if (sharedContextPrivate)
           shareCtx = ((ffbContextPtr) sharedContextPrivate)->glCtx;
        else 
           shareCtx = NULL;
        fmesa->glCtx = _mesa_create_context(mesaVis, shareCtx,
                                            &functions, fmesa);
        if (!fmesa->glCtx) {
           FREE(fmesa);
           return GL_FALSE;
        }
        driContextPriv->driverPrivate = fmesa;
        ctx = fmesa->glCtx;

	sPriv = driContextPriv->driScreenPriv;
	ffbScreen = (ffbScreenPrivate *) sPriv->private;

	/* Dri stuff. */
	fmesa->hHWContext = driContextPriv->hHWContext;
	fmesa->driFd = sPriv->fd;
	fmesa->driHwLock = &sPriv->pSAREA->lock;

	fmesa->ffbScreen = ffbScreen;
	fmesa->driScreen = sPriv;
	fmesa->ffb_sarea = FFB_DRISHARE(sPriv->pSAREA);

	/* Register and framebuffer pointers. */
	fmesa->regs = ffbScreen->regs;
	fmesa->sfb32 = ffbScreen->sfb32;

	ffbDDInitContextHwState(ctx);

	/* Default clear and depth colors. */
	{
		GLubyte r = (GLint) (ctx->Color.ClearColor[0] * 255.0F);
		GLubyte g = (GLint) (ctx->Color.ClearColor[1] * 255.0F);
		GLubyte b = (GLint) (ctx->Color.ClearColor[2] * 255.0F);

		fmesa->clear_pixel = ((r << 0) |
				      (g << 8) |
				      (b << 16));
	}
	fmesa->clear_depth = Z_FROM_MESA(ctx->Depth.Clear * 4294967295.0f);
	fmesa->clear_stencil = ctx->Stencil.Clear & 0xf;

	/* No wide points. */
	ctx->Const.MinPointSize = 1.0;
	ctx->Const.MinPointSizeAA = 1.0;
	ctx->Const.MaxPointSize = 1.0;
	ctx->Const.MaxPointSizeAA = 1.0;

	/* Disable wide lines as we can't antialias them correctly in
	 * hardware.
	 */
	ctx->Const.MinLineWidth = 1.0;
	ctx->Const.MinLineWidthAA = 1.0;
	ctx->Const.MaxLineWidth = 1.0;
	ctx->Const.MaxLineWidthAA = 1.0;
	ctx->Const.LineWidthGranularity = 1.0;

	ctx->Const.MaxDrawBuffers = 1;

	/* Instead of having GCC emit these constants a zillion times
	 * everywhere in the driver, put them here.
	 */
	fmesa->ffb_2_30_fixed_scale           = __FFB_2_30_FIXED_SCALE;
	fmesa->ffb_one_over_2_30_fixed_scale  = (1.0 / __FFB_2_30_FIXED_SCALE);
	fmesa->ffb_16_16_fixed_scale          = __FFB_16_16_FIXED_SCALE;
	fmesa->ffb_one_over_16_16_fixed_scale = (1.0 / __FFB_16_16_FIXED_SCALE);
	fmesa->ffb_ubyte_color_scale          = 255.0f;
	fmesa->ffb_zero			      = 0.0f;

	fmesa->debugFallbacks = GL_FALSE;
	debug = getenv("LIBGL_DEBUG");
	if (debug && strstr(debug, "fallbacks"))
		fmesa->debugFallbacks = GL_TRUE;

	/* Initialize the software rasterizer and helper modules. */
	_swrast_CreateContext( ctx );
	_vbo_CreateContext( ctx );
	_tnl_CreateContext( ctx );
	_swsetup_CreateContext( ctx );

	/* All of this need only be done once for a new context. */
	/* XXX these should be moved right after the
	 *  _mesa_init_driver_functions() call above.
	 */
	ffbDDExtensionsInit(ctx);
	ffbDDInitDriverFuncs(ctx);
	ffbDDInitStateFuncs(ctx);
	ffbDDInitRenderFuncs(ctx);
	/*ffbDDInitTexFuncs(ctx); not needed */
	ffbDDInitBitmapFuncs(ctx);
	ffbInitVB(ctx);

#if 0
	ffbInitTnlModule(ctx);
#endif

	_tnl_destroy_pipeline(ctx);
	_tnl_install_pipeline(ctx, ffb_pipeline);

	return GL_TRUE;
}

static void
ffbDestroyContext(__DRIcontextPrivate *driContextPriv)
{
	ffbContextPtr fmesa = (ffbContextPtr) driContextPriv->driverPrivate;

	if (fmesa) {
		ffbFreeVB(fmesa->glCtx);

		_swsetup_DestroyContext( fmesa->glCtx );
		_tnl_DestroyContext( fmesa->glCtx );
		_vbo_DestroyContext( fmesa->glCtx );
		_swrast_DestroyContext( fmesa->glCtx );

                /* free the Mesa context */
                fmesa->glCtx->DriverCtx = NULL;
                _mesa_destroy_context(fmesa->glCtx);

		FREE(fmesa);
	}
}

/* Create and initialize the Mesa and driver specific pixmap buffer data */
static GLboolean
ffbCreateBuffer(__DRIscreenPrivate *driScrnPriv,
                __DRIdrawablePrivate *driDrawPriv,
                const __GLcontextModes *mesaVis,
                GLboolean isPixmap )
{
   /* Mesa checks for pitch > 0, but ffb doesn't use pitches */
   int bogusPitch = 1;
   int bpp = 4; /* we've always got a 32bpp framebuffer */
   int offset = 0; /* always at 0 for offset */

   if (isPixmap) {
      return GL_FALSE; /* not implemented */
   } else {
      GLboolean swStencil = (mesaVis->stencilBits > 0 && 
			     mesaVis->depthBits != 24);
      struct gl_framebuffer *fb = _mesa_create_framebuffer(mesaVis);

      {
         driRenderbuffer *frontRb
            = driNewRenderbuffer(GL_RGBA, NULL, bpp, offset, bogusPitch,
                                 driDrawPriv);
         ffbSetSpanFunctions(frontRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_FRONT_LEFT, &frontRb->Base);
      }

      if (mesaVis->doubleBufferMode) {
         driRenderbuffer *backRb
            = driNewRenderbuffer(GL_RGBA, NULL, bpp, offset, bogusPitch,
                                 driDrawPriv);
         ffbSetSpanFunctions(backRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_BACK_LEFT, &backRb->Base);
      }

      if (mesaVis->depthBits == 16) {
         driRenderbuffer *depthRb
            = driNewRenderbuffer(GL_DEPTH_COMPONENT16, NULL, bpp, offset,
                                 bogusPitch, driDrawPriv);
         ffbSetDepthFunctions(depthRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_DEPTH, &depthRb->Base);
      }

      if (mesaVis->stencilBits > 0 && !swStencil) {
         driRenderbuffer *stencilRb
            = driNewRenderbuffer(GL_STENCIL_INDEX8_EXT, NULL, bpp, offset,
                                 bogusPitch, driDrawPriv);
         ffbSetStencilFunctions(stencilRb, mesaVis);
         _mesa_add_renderbuffer(fb, BUFFER_STENCIL, &stencilRb->Base);
      }

      _mesa_add_soft_renderbuffers(fb,
                                   GL_FALSE, /* color */
                                   GL_FALSE, /* depth */
                                   swStencil,
                                   mesaVis->accumRedBits > 0,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */);
      driDrawPriv->driverPrivate = (void *) fb;

      return (driDrawPriv->driverPrivate != NULL);
   }
}


static void
ffbDestroyBuffer(__DRIdrawablePrivate *driDrawPriv)
{
   _mesa_unreference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)));
}


#define USE_FAST_SWAP

static void
ffbSwapBuffers( __DRIdrawablePrivate *dPriv )
{
	ffbContextPtr fmesa = (ffbContextPtr) dPriv->driContextPriv->driverPrivate;
	unsigned int fbc, wid, wid_reg_val, dac_db_bit;
	unsigned int shadow_dac_addr, active_dac_addr;
	ffb_fbcPtr ffb;
	ffb_dacPtr dac;

	if (fmesa == NULL ||
	    fmesa->glCtx->Visual.doubleBufferMode == 0)
		return;

	/* Flush pending rendering commands */
	_mesa_notifySwapBuffers(fmesa->glCtx);

	ffb = fmesa->regs;
	dac = fmesa->ffbScreen->dac;

	fbc = fmesa->fbc;
	wid = fmesa->wid;

	/* Swap the buffer we render into and read pixels from. */
	fmesa->back_buffer ^= 1;

	/* If we are writing into both buffers, don't mess with
	 * the WB setting.
	 */
	if ((fbc & FFB_FBC_WB_AB) != FFB_FBC_WB_AB) {
		if ((fbc & FFB_FBC_WB_A) != 0)
			fbc = (fbc & ~FFB_FBC_WB_A) | FFB_FBC_WB_B;
		else
			fbc = (fbc & ~FFB_FBC_WB_B) | FFB_FBC_WB_A;
	}

	/* But either way, we must flip the read buffer setting. */
	if ((fbc & FFB_FBC_RB_A) != 0)
		fbc = (fbc & ~FFB_FBC_RB_A) | FFB_FBC_RB_B;
	else
		fbc = (fbc & ~FFB_FBC_RB_B) | FFB_FBC_RB_A;

	LOCK_HARDWARE(fmesa);

	if (fmesa->fbc != fbc) {
		FFBFifo(fmesa, 1);
		ffb->fbc = fmesa->fbc = fbc;
		fmesa->ffbScreen->rp_active = 1;
	}

	/* And swap the buffer displayed in the WID. */
	if (fmesa->ffb_sarea->flags & FFB_DRI_PAC1) {
		shadow_dac_addr = FFBDAC_PAC1_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC1_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC1_WLUT_DB;
	} else {
		shadow_dac_addr = FFBDAC_PAC2_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC2_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC2_WLUT_DB;
	}

	FFBWait(fmesa, ffb);

	wid_reg_val = DACCFG_READ(dac, active_dac_addr);
	if (fmesa->back_buffer == 0)
		wid_reg_val |=  dac_db_bit;
	else
		wid_reg_val &= ~dac_db_bit;
#ifdef USE_FAST_SWAP
	DACCFG_WRITE(dac, active_dac_addr, wid_reg_val);
#else
	DACCFG_WRITE(dac, shadow_dac_addr, wid_reg_val);

	/* Schedule the window transfer. */
	DACCFG_WRITE(dac, FFBDAC_CFG_WTCTRL, 
		     (FFBDAC_CFG_WTCTRL_TCMD | FFBDAC_CFG_WTCTRL_TE));

	{
		int limit = 1000000;
		while (limit--) {
			unsigned int wtctrl = DACCFG_READ(dac, FFBDAC_CFG_WTCTRL);

			if ((wtctrl & FFBDAC_CFG_WTCTRL_DS) == 0)
				break;
		}
	}
#endif

	UNLOCK_HARDWARE(fmesa);
}

static void ffb_init_wid(ffbContextPtr fmesa, unsigned int wid)
{
	ffb_dacPtr dac = fmesa->ffbScreen->dac;
	unsigned int wid_reg_val, dac_db_bit, active_dac_addr;
	unsigned int shadow_dac_addr;

	if (fmesa->ffb_sarea->flags & FFB_DRI_PAC1) {
		shadow_dac_addr = FFBDAC_PAC1_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC1_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC1_WLUT_DB;
	} else {
		shadow_dac_addr = FFBDAC_PAC2_SPWLUT(wid);
		active_dac_addr = FFBDAC_PAC2_APWLUT(wid);
		dac_db_bit = FFBDAC_PAC2_WLUT_DB;
	}

	wid_reg_val = DACCFG_READ(dac, active_dac_addr);
	wid_reg_val &= ~dac_db_bit;
#ifdef USE_FAST_SWAP
	DACCFG_WRITE(dac, active_dac_addr, wid_reg_val);
#else
	DACCFG_WRITE(dac, shadow_dac_addr, wid_reg_val);

	/* Schedule the window transfer. */
	DACCFG_WRITE(dac, FFBDAC_CFG_WTCTRL, 
		     (FFBDAC_CFG_WTCTRL_TCMD | FFBDAC_CFG_WTCTRL_TE));

	{
		int limit = 1000000;
		while (limit--) {
			unsigned int wtctrl = DACCFG_READ(dac, FFBDAC_CFG_WTCTRL);

			if ((wtctrl & FFBDAC_CFG_WTCTRL_DS) == 0)
				break;
		}
	}
#endif
}

/* Force the context `c' to be the current context and associate with it
   buffer `b' */
static GLboolean
ffbMakeCurrent(__DRIcontextPrivate *driContextPriv,
               __DRIdrawablePrivate *driDrawPriv,
               __DRIdrawablePrivate *driReadPriv)
{
	if (driContextPriv) {
		ffbContextPtr fmesa = (ffbContextPtr) driContextPriv->driverPrivate;
		int first_time;

		fmesa->driDrawable = driDrawPriv;

		_mesa_make_current(fmesa->glCtx, 
			    (GLframebuffer *) driDrawPriv->driverPrivate, 
			    (GLframebuffer *) driReadPriv->driverPrivate);

		first_time = 0;
		if (fmesa->wid == ~0) {
			first_time = 1;
			if (getenv("LIBGL_SOFTWARE_RENDERING"))
				FALLBACK( fmesa->glCtx, FFB_BADATTR_SWONLY, GL_TRUE );
		}

		LOCK_HARDWARE(fmesa);
		if (first_time) {
			fmesa->wid = fmesa->ffb_sarea->wid_table[driDrawPriv->index];
			ffb_init_wid(fmesa, fmesa->wid);
		}

		fmesa->state_dirty |= FFB_STATE_ALL;
		fmesa->state_fifo_ents = fmesa->state_all_fifo_ents;
		ffbSyncHardware(fmesa);
		UNLOCK_HARDWARE(fmesa);

		if (first_time) {
			/* Also, at the first switch to a new context,
			 * we need to clear all the hw buffers.
			 */
			ffbDDClear(fmesa->glCtx,
				   (BUFFER_BIT_FRONT_LEFT | BUFFER_BIT_BACK_LEFT |
				    BUFFER_BIT_DEPTH | BUFFER_BIT_STENCIL));
		}
	} else {
		_mesa_make_current(NULL, NULL, NULL);
	}

	return GL_TRUE;
}

/* Force the context `c' to be unbound from its buffer */
static GLboolean
ffbUnbindContext(__DRIcontextPrivate *driContextPriv)
{
	return GL_TRUE;
}

void ffbXMesaUpdateState(ffbContextPtr fmesa)
{
	__DRIdrawablePrivate *dPriv = fmesa->driDrawable;
	__DRIscreenPrivate *sPriv = fmesa->driScreen;
	int stamp = dPriv->lastStamp;

	DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);

	if (dPriv->lastStamp != stamp) {
		GLcontext *ctx = fmesa->glCtx;

		ffbCalcViewport(ctx);
		driUpdateFramebufferSize(ctx, dPriv);
		if (ctx->Polygon.StippleFlag) {
			ffbXformAreaPattern(fmesa,
					    (const GLubyte *)ctx->PolygonStipple);
		}
	}
}

static const __DRIconfig **
ffbFillInModes( __DRIscreenPrivate *psp,
		unsigned pixel_bits, unsigned depth_bits,
		unsigned stencil_bits, GLboolean have_back_buffer )
{
   __DRIconfig **configs;
   __GLcontextModes *m;
   unsigned depth_buffer_factor;
   unsigned back_buffer_factor;
   GLenum fb_format;
   GLenum fb_type;
   int i;

   /* GLX_SWAP_COPY_OML is only supported because the FFB driver doesn't
    * support pageflipping at all.
    */
   static const GLenum back_buffer_modes[] = {
      GLX_NONE, GLX_SWAP_UNDEFINED_OML, GLX_SWAP_COPY_OML
   };

   uint8_t depth_bits_array[3];
   uint8_t stencil_bits_array[3];
   uint8_t msaa_samples_array[1];

   depth_bits_array[0] = 0;
   depth_bits_array[1] = depth_bits;
   depth_bits_array[2] = depth_bits;

   /* Just like with the accumulation buffer, always provide some modes
    * with a stencil buffer.  It will be a sw fallback, but some apps won't
    * care about that.
    */
   stencil_bits_array[0] = 0;
   stencil_bits_array[1] = 0;
   stencil_bits_array[2] = (stencil_bits == 0) ? 8 : stencil_bits;

   msaa_samples_array[0] = 0;

   depth_buffer_factor = ((depth_bits != 0) || (stencil_bits != 0)) ? 3 : 1;
   back_buffer_factor  = (have_back_buffer) ? 3 : 1;

    if ( pixel_bits == 16 ) {
        fb_format = GL_RGB;
        fb_type = GL_UNSIGNED_SHORT_5_6_5;
    }
    else {
        fb_format = GL_BGRA;
        fb_type = GL_UNSIGNED_INT_8_8_8_8_REV;
    }

   configs = driCreateConfigs(fb_format, fb_type,
			      depth_bits_array, stencil_bits_array,
			      depth_buffer_factor, back_buffer_modes,
			      back_buffer_factor,
                               msaa_samples_array, 1);
   if (configs == NULL) {
      fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
              __LINE__);
      return NULL;
   }

   /* Mark the visual as slow if there are "fake" stencil bits.
    */
   for (i = 0; configs[i]; i++) {
      m = &configs[i]->modes;
      if ((m->stencilBits != 0) && (m->stencilBits != stencil_bits)) {
         m->visualRating = GLX_SLOW_CONFIG;
      }
   }

   return (const __DRIconfig **) configs;
}


/**
 * This is the driver specific part of the createNewScreen entry point.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the __GLcontextModes supported by this driver
 */
static const __DRIconfig **
ffbInitScreen(__DRIscreen *psp)
{
   static const __DRIversion ddx_expected = { 0, 1, 1 };
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 0, 0, 1 };

   if ( ! driCheckDriDdxDrmVersions2( "ffb",
				      &psp->dri_version, & dri_expected,
				      &psp->ddx_version, & ddx_expected,
				      &psp->drm_version, & drm_expected ) )
      return NULL;

   if (!ffbInitDriver(psp))
       return NULL;

   return ffbFillInModes( psp, 32, 16, 0, GL_TRUE );
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen      = ffbInitScreen,
   .DestroyScreen   = ffbDestroyScreen,
   .CreateContext   = ffbCreateContext,
   .DestroyContext  = ffbDestroyContext,
   .CreateBuffer    = ffbCreateBuffer,
   .DestroyBuffer   = ffbDestroyBuffer,
   .SwapBuffers     = ffbSwapBuffers,
   .MakeCurrent     = ffbMakeCurrent,
   .UnbindContext   = ffbUnbindContext,
   .GetSwapInfo     = NULL,
   .GetDrawableMSC  = NULL,
   .WaitForMSC      = NULL,
   .WaitForSBC      = NULL,
   .SwapBuffersMSC  = NULL
};