summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/intel/intel_screen.c
blob: 1b8c56e68d6c89c42c90cf92c6bf04c90ae70610 (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
/**************************************************************************
 * 
 * Copyright 2003 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation 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 TUNGSTEN GRAPHICS 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.
 * 
 **************************************************************************/

#include "main/glheader.h"
#include "main/context.h"
#include "main/framebuffer.h"
#include "main/renderbuffer.h"

#include "utils.h"
#include "vblank.h"
#include "xmlpool.h"

#include "intel_batchbuffer.h"
#include "intel_buffers.h"
#include "intel_bufmgr.h"
#include "intel_chipset.h"
#include "intel_extensions.h"
#include "intel_fbo.h"
#include "intel_regions.h"
#include "intel_swapbuffers.h"
#include "intel_screen.h"
#include "intel_span.h"
#include "intel_tex.h"

#include "i915_drm.h"
#include "i830_dri.h"

#define DRI_CONF_TEXTURE_TILING(def) \
	DRI_CONF_OPT_BEGIN(texture_tiling, bool, def)		\
		DRI_CONF_DESC(en, "Enable texture tiling")	\
	DRI_CONF_OPT_END					\

PUBLIC const char __driConfigOptions[] =
   DRI_CONF_BEGIN
   DRI_CONF_SECTION_PERFORMANCE
      DRI_CONF_FTHROTTLE_MODE(DRI_CONF_FTHROTTLE_IRQS)
      DRI_CONF_VBLANK_MODE(DRI_CONF_VBLANK_ALWAYS_SYNC)
      /* Options correspond to DRI_CONF_BO_REUSE_DISABLED,
       * DRI_CONF_BO_REUSE_ALL
       */
      DRI_CONF_OPT_BEGIN_V(bo_reuse, enum, 1, "0:1")
	 DRI_CONF_DESC_BEGIN(en, "Buffer object reuse")
	    DRI_CONF_ENUM(0, "Disable buffer object reuse")
	    DRI_CONF_ENUM(1, "Enable reuse of all sizes of buffer objects")
	 DRI_CONF_DESC_END
      DRI_CONF_OPT_END

#ifdef I915
     DRI_CONF_TEXTURE_TILING(false)
#else
     DRI_CONF_TEXTURE_TILING(true)
#endif

      DRI_CONF_OPT_BEGIN(early_z, bool, false)
	 DRI_CONF_DESC(en, "Enable early Z in classic mode (unstable, 945-only).")
      DRI_CONF_OPT_END

   DRI_CONF_SECTION_END
   DRI_CONF_SECTION_QUALITY
      DRI_CONF_FORCE_S3TC_ENABLE(false)
      DRI_CONF_ALLOW_LARGE_TEXTURES(2)
   DRI_CONF_SECTION_END
   DRI_CONF_SECTION_DEBUG
     DRI_CONF_NO_RAST(false)
     DRI_CONF_ALWAYS_FLUSH_BATCH(false)
     DRI_CONF_ALWAYS_FLUSH_CACHE(false)
   DRI_CONF_SECTION_END
DRI_CONF_END;

const GLuint __driNConfigOptions = 10;

#ifdef USE_NEW_INTERFACE
static PFNGLXCREATECONTEXTMODES create_context_modes = NULL;
#endif /*USE_NEW_INTERFACE */

/**
 * Map all the memory regions described by the screen.
 * \return GL_TRUE if success, GL_FALSE if error.
 */
GLboolean
intelMapScreenRegions(__DRIscreenPrivate * sPriv)
{
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;

   if (0)
      _mesa_printf("TEX 0x%08x ", intelScreen->tex.handle);
   if (intelScreen->tex.size != 0) {
      if (drmMap(sPriv->fd,
		 intelScreen->tex.handle,
		 intelScreen->tex.size,
		 (drmAddress *) & intelScreen->tex.map) != 0) {
	 intelUnmapScreenRegions(intelScreen);
	 return GL_FALSE;
      }
   }

   return GL_TRUE;
}

void
intelUnmapScreenRegions(intelScreenPrivate * intelScreen)
{
   if (intelScreen->tex.map) {
      drmUnmap(intelScreen->tex.map, intelScreen->tex.size);
      intelScreen->tex.map = NULL;
   }
}


static void
intelPrintDRIInfo(intelScreenPrivate * intelScreen,
                  __DRIscreenPrivate * sPriv, I830DRIPtr gDRIPriv)
{
   fprintf(stderr, "*** Front size:   0x%x  offset: 0x%x  pitch: %d\n",
           intelScreen->front.size, intelScreen->front.offset,
           intelScreen->pitch);
   fprintf(stderr, "*** Back size:    0x%x  offset: 0x%x  pitch: %d\n",
           intelScreen->back.size, intelScreen->back.offset,
           intelScreen->pitch);
   fprintf(stderr, "*** Depth size:   0x%x  offset: 0x%x  pitch: %d\n",
           intelScreen->depth.size, intelScreen->depth.offset,
           intelScreen->pitch);
   fprintf(stderr, "*** Texture size: 0x%x  offset: 0x%x\n",
           intelScreen->tex.size, intelScreen->tex.offset);
   fprintf(stderr, "*** Memory : 0x%x\n", gDRIPriv->mem);
}


static void
intelPrintSAREA(const drm_i915_sarea_t * sarea)
{
   fprintf(stderr, "SAREA: sarea width %d  height %d\n", sarea->width,
           sarea->height);
   fprintf(stderr, "SAREA: pitch: %d\n", sarea->pitch);
   fprintf(stderr,
           "SAREA: front offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
           sarea->front_offset, sarea->front_size,
           (unsigned) sarea->front_handle, sarea->front_tiled);
   fprintf(stderr,
           "SAREA: back  offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
           sarea->back_offset, sarea->back_size,
           (unsigned) sarea->back_handle, sarea->back_tiled);
   fprintf(stderr, "SAREA: depth offset: 0x%08x  size: 0x%x  handle: 0x%x tiled: %d\n",
           sarea->depth_offset, sarea->depth_size,
           (unsigned) sarea->depth_handle, sarea->depth_tiled);
   fprintf(stderr, "SAREA: tex   offset: 0x%08x  size: 0x%x  handle: 0x%x\n",
           sarea->tex_offset, sarea->tex_size, (unsigned) sarea->tex_handle);
}


/**
 * A number of the screen parameters are obtained/computed from
 * information in the SAREA.  This function updates those parameters.
 */
static void
intelUpdateScreenFromSAREA(intelScreenPrivate * intelScreen,
                           drm_i915_sarea_t * sarea)
{
   intelScreen->width = sarea->width;
   intelScreen->height = sarea->height;
   intelScreen->pitch = sarea->pitch;

   intelScreen->front.offset = sarea->front_offset;
   intelScreen->front.handle = sarea->front_handle;
   intelScreen->front.size = sarea->front_size;
   intelScreen->front.tiled = sarea->front_tiled;

   intelScreen->back.offset = sarea->back_offset;
   intelScreen->back.handle = sarea->back_handle;
   intelScreen->back.size = sarea->back_size;
   intelScreen->back.tiled = sarea->back_tiled;

   intelScreen->depth.offset = sarea->depth_offset;
   intelScreen->depth.handle = sarea->depth_handle;
   intelScreen->depth.size = sarea->depth_size;
   intelScreen->depth.tiled = sarea->depth_tiled;

   if (intelScreen->driScrnPriv->ddx_version.minor >= 9) {
      intelScreen->front.bo_handle = sarea->front_bo_handle;
      intelScreen->back.bo_handle = sarea->back_bo_handle;
      intelScreen->depth.bo_handle = sarea->depth_bo_handle;
   } else {
      intelScreen->front.bo_handle = -1;
      intelScreen->back.bo_handle = -1;
      intelScreen->depth.bo_handle = -1;
   }

   intelScreen->tex.offset = sarea->tex_offset;
   intelScreen->logTextureGranularity = sarea->log_tex_granularity;
   intelScreen->tex.handle = sarea->tex_handle;
   intelScreen->tex.size = sarea->tex_size;

   if (0)
      intelPrintSAREA(sarea);
}

static const __DRItexOffsetExtension intelTexOffsetExtension = {
   { __DRI_TEX_OFFSET },
   intelSetTexOffset,
};

static const __DRItexBufferExtension intelTexBufferExtension = {
    { __DRI_TEX_BUFFER, __DRI_TEX_BUFFER_VERSION },
   intelSetTexBuffer,
   intelSetTexBuffer2,
};

static const __DRIextension *intelScreenExtensions[] = {
    &driReadDrawableExtension,
    &driCopySubBufferExtension.base,
    &driSwapControlExtension.base,
    &driFrameTrackingExtension.base,
    &driMediaStreamCounterExtension.base,
    &intelTexOffsetExtension.base,
    &intelTexBufferExtension.base,
    NULL
};

static GLboolean
intel_get_param(__DRIscreenPrivate *psp, int param, int *value)
{
   int ret;
   struct drm_i915_getparam gp;

   gp.param = param;
   gp.value = value;

   ret = drmCommandWriteRead(psp->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));
   if (ret) {
      _mesa_warning(NULL, "drm_i915_getparam: %d", ret);
      return GL_FALSE;
   }

   return GL_TRUE;
}

static GLboolean intelInitDriver(__DRIscreenPrivate *sPriv)
{
   intelScreenPrivate *intelScreen;
   I830DRIPtr gDRIPriv = (I830DRIPtr) sPriv->pDevPriv;
   drm_i915_sarea_t *sarea;

   if (sPriv->devPrivSize != sizeof(I830DRIRec)) {
      fprintf(stderr,
              "\nERROR!  sizeof(I830DRIRec) does not match passed size from device driver\n");
      return GL_FALSE;
   }

   /* Allocate the private area */
   intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
   if (!intelScreen) {
      fprintf(stderr, "\nERROR!  Allocating private area failed\n");
      return GL_FALSE;
   }
   /* parse information in __driConfigOptions */
   driParseOptionInfo(&intelScreen->optionCache,
                      __driConfigOptions, __driNConfigOptions);

   intelScreen->driScrnPriv = sPriv;
   sPriv->private = (void *) intelScreen;
   sarea = (drm_i915_sarea_t *)
      (((GLubyte *) sPriv->pSAREA) + gDRIPriv->sarea_priv_offset);
   intelScreen->sarea = sarea;

   intelScreen->deviceID = gDRIPriv->deviceID;

   intelUpdateScreenFromSAREA(intelScreen, sarea);

   if (!intelMapScreenRegions(sPriv)) {
      fprintf(stderr, "\nERROR!  mapping regions\n");
      _mesa_free(intelScreen);
      sPriv->private = NULL;
      return GL_FALSE;
   }

   if (0)
      intelPrintDRIInfo(intelScreen, sPriv, gDRIPriv);

   intelScreen->drmMinor = sPriv->drm_version.minor;

   /* Determine if IRQs are active? */
   if (!intel_get_param(sPriv, I915_PARAM_IRQ_ACTIVE,
			&intelScreen->irq_active))
      return GL_FALSE;

   sPriv->extensions = intelScreenExtensions;

   return GL_TRUE;
}


static void
intelDestroyScreen(__DRIscreenPrivate * sPriv)
{
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;

   dri_bufmgr_destroy(intelScreen->bufmgr);
   intelUnmapScreenRegions(intelScreen);
   driDestroyOptionInfo(&intelScreen->optionCache);

   FREE(intelScreen);
   sPriv->private = NULL;
}


/**
 * This is called when we need to set up GL rendering to a new X window.
 */
static GLboolean
intelCreateBuffer(__DRIscreenPrivate * driScrnPriv,
                  __DRIdrawablePrivate * driDrawPriv,
                  const __GLcontextModes * mesaVis, GLboolean isPixmap)
{
   if (isPixmap) {
      return GL_FALSE;          /* not implemented */
   }
   else {
      GLboolean swStencil = (mesaVis->stencilBits > 0 &&
                             mesaVis->depthBits != 24);
      GLenum rgbFormat;

      struct intel_framebuffer *intel_fb = CALLOC_STRUCT(intel_framebuffer);

      if (!intel_fb)
	 return GL_FALSE;

      _mesa_initialize_framebuffer(&intel_fb->Base, mesaVis);

      if (mesaVis->redBits == 5)
	 rgbFormat = GL_RGB5;
      else if (mesaVis->alphaBits == 0)
	 rgbFormat = GL_RGB8;
      else
	 rgbFormat = GL_RGBA8;

      /* setup the hardware-based renderbuffers */
      intel_fb->color_rb[0] = intel_create_renderbuffer(rgbFormat);
      _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_FRONT_LEFT,
			     &intel_fb->color_rb[0]->Base);

      if (mesaVis->doubleBufferMode) {
	 intel_fb->color_rb[1] = intel_create_renderbuffer(rgbFormat);

         _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_BACK_LEFT,
				&intel_fb->color_rb[1]->Base);

      }

      if (mesaVis->depthBits == 24) {
	 if (mesaVis->stencilBits == 8) {
	    /* combined depth/stencil buffer */
	    struct intel_renderbuffer *depthStencilRb
	       = intel_create_renderbuffer(GL_DEPTH24_STENCIL8_EXT);
	    /* note: bind RB to two attachment points */
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
				   &depthStencilRb->Base);
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_STENCIL,
				   &depthStencilRb->Base);
	 } else {
	    struct intel_renderbuffer *depthRb
	       = intel_create_renderbuffer(GL_DEPTH_COMPONENT24);
	    _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH,
				   &depthRb->Base);
	 }
      }
      else if (mesaVis->depthBits == 16) {
         /* just 16-bit depth buffer, no hw stencil */
         struct intel_renderbuffer *depthRb
	    = intel_create_renderbuffer(GL_DEPTH_COMPONENT16);
         _mesa_add_renderbuffer(&intel_fb->Base, BUFFER_DEPTH, &depthRb->Base);
      }

      /* now add any/all software-based renderbuffers we may need */
      _mesa_add_soft_renderbuffers(&intel_fb->Base,
                                   GL_FALSE, /* never sw color */
                                   GL_FALSE, /* never sw depth */
                                   swStencil, mesaVis->accumRedBits > 0,
                                   GL_FALSE, /* never sw alpha */
                                   GL_FALSE  /* never sw aux */ );
      driDrawPriv->driverPrivate = (void *) intel_fb;

      return GL_TRUE;
   }
}

static void
intelDestroyBuffer(__DRIdrawablePrivate * driDrawPriv)
{
   struct intel_framebuffer *intel_fb = driDrawPriv->driverPrivate;
   struct intel_renderbuffer *depth_rb;
   struct intel_renderbuffer *stencil_rb;

   if (intel_fb) {
      if (intel_fb->color_rb[0]) {
         intel_renderbuffer_set_region(intel_fb->color_rb[0], NULL);
      }

      if (intel_fb->color_rb[1]) {
         intel_renderbuffer_set_region(intel_fb->color_rb[1], NULL);
      }

      depth_rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
      if (depth_rb) {
         intel_renderbuffer_set_region(depth_rb, NULL);
      }

      stencil_rb = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);
      if (stencil_rb) {
         intel_renderbuffer_set_region(stencil_rb, NULL);
      }
   }

   _mesa_reference_framebuffer((GLframebuffer **)(&(driDrawPriv->driverPrivate)), NULL);
}


/**
 * Get information about previous buffer swaps.
 */
static int
intelGetSwapInfo(__DRIdrawablePrivate * dPriv, __DRIswapInfo * sInfo)
{
   struct intel_framebuffer *intel_fb;

   if ((dPriv == NULL) || (dPriv->driverPrivate == NULL)
       || (sInfo == NULL)) {
      return -1;
   }

   intel_fb = dPriv->driverPrivate;
   sInfo->swap_count = intel_fb->swap_count;
   sInfo->swap_ust = intel_fb->swap_ust;
   sInfo->swap_missed_count = intel_fb->swap_missed_count;

   sInfo->swap_missed_usage = (sInfo->swap_missed_count != 0)
      ? driCalculateSwapUsage(dPriv, 0, intel_fb->swap_missed_ust)
      : 0.0;

   return 0;
}


/* There are probably better ways to do this, such as an
 * init-designated function to register chipids and createcontext
 * functions.
 */
extern GLboolean i830CreateContext(const __GLcontextModes * mesaVis,
                                   __DRIcontextPrivate * driContextPriv,
                                   void *sharedContextPrivate);

extern GLboolean i915CreateContext(const __GLcontextModes * mesaVis,
                                   __DRIcontextPrivate * driContextPriv,
                                   void *sharedContextPrivate);
extern GLboolean brwCreateContext(const __GLcontextModes * mesaVis,
				  __DRIcontextPrivate * driContextPriv,
				  void *sharedContextPrivate);

static GLboolean
intelCreateContext(const __GLcontextModes * mesaVis,
                   __DRIcontextPrivate * driContextPriv,
                   void *sharedContextPrivate)
{
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;

#ifdef I915
   if (IS_9XX(intelScreen->deviceID)) {
      if (!IS_965(intelScreen->deviceID)) {
	 return i915CreateContext(mesaVis, driContextPriv,
				  sharedContextPrivate);
      }
   } else {
      intelScreen->no_vbo = GL_TRUE;
      return i830CreateContext(mesaVis, driContextPriv, sharedContextPrivate);
   }
#else
   if (IS_965(intelScreen->deviceID))
      return brwCreateContext(mesaVis, driContextPriv, sharedContextPrivate);
#endif
   fprintf(stderr, "Unrecognized deviceID %x\n", intelScreen->deviceID);
   return GL_FALSE;
}


static __DRIconfig **
intelFillInModes(__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;
   int i;

   /* GLX_SWAP_COPY_OML is only supported because the Intel 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;
   if (depth_bits == 24)
      stencil_bits_array[1] = (stencil_bits == 0) ? 8 : stencil_bits;

   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) {
      configs = driCreateConfigs(GL_RGB, GL_UNSIGNED_SHORT_5_6_5,
				 depth_bits_array, stencil_bits_array,
				 depth_buffer_factor, back_buffer_modes,
				 back_buffer_factor,
				 msaa_samples_array, 1);
   }
   else {
      __DRIconfig **configs_a8r8g8b8;
      __DRIconfig **configs_x8r8g8b8;

      configs_a8r8g8b8 = driCreateConfigs(GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV,
					  depth_bits_array,
					  stencil_bits_array,
					  depth_buffer_factor,
					  back_buffer_modes,
					  back_buffer_factor,
					  msaa_samples_array, 1);
      configs_x8r8g8b8 = driCreateConfigs(GL_BGR, GL_UNSIGNED_INT_8_8_8_8_REV,
					  depth_bits_array,
					  stencil_bits_array,
					  depth_buffer_factor,
					  back_buffer_modes,
					  back_buffer_factor,
					  msaa_samples_array, 1);
      configs = driConcatConfigs(configs_a8r8g8b8, configs_x8r8g8b8);
   }

   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 configs;
}

static GLboolean
intel_init_bufmgr(intelScreenPrivate *intelScreen)
{
   GLboolean gem_disable = getenv("INTEL_NO_GEM") != NULL;
   int gem_kernel = 0;
   GLboolean gem_supported;
   struct drm_i915_getparam gp;
   __DRIscreenPrivate *spriv = intelScreen->driScrnPriv;
   int num_fences = 0;

   intelScreen->no_hw = getenv("INTEL_NO_HW") != NULL;

   gp.param = I915_PARAM_HAS_GEM;
   gp.value = &gem_kernel;

   (void) drmCommandWriteRead(spriv->fd, DRM_I915_GETPARAM, &gp, sizeof(gp));

   /* If we've got a new enough DDX that's initializing GEM and giving us
    * object handles for the shared buffers, use that.
    */
   intelScreen->ttm = GL_FALSE;
   if (intelScreen->driScrnPriv->dri2.enabled)
       gem_supported = GL_TRUE;
   else if (intelScreen->driScrnPriv->ddx_version.minor >= 9 &&
	    gem_kernel &&
	    intelScreen->front.bo_handle != -1)
       gem_supported = GL_TRUE;
   else
       gem_supported = GL_FALSE;

   if (!gem_disable && gem_supported) {
      intelScreen->bufmgr = intel_bufmgr_gem_init(spriv->fd, BATCH_SZ);
      if (intelScreen->bufmgr != NULL)
	 intelScreen->ttm = GL_TRUE;
   }
   /* Otherwise, use the classic buffer manager. */
   if (intelScreen->bufmgr == NULL) {
      if (gem_disable) {
	 _mesa_warning(NULL, "GEM disabled.  Using classic.");
      } else {
	 _mesa_warning(NULL,
                       "Failed to initialize GEM.  Falling back to classic.");
      }

      if (intelScreen->tex.size == 0) {
	 fprintf(stderr, "[%s:%u] Error initializing buffer manager.\n",
		 __func__, __LINE__);
	 return GL_FALSE;
      }

      intelScreen->bufmgr =
	 intel_bufmgr_fake_init(spriv->fd,
				intelScreen->tex.offset,
				intelScreen->tex.map,
				intelScreen->tex.size,
				(unsigned int * volatile)
				&intelScreen->sarea->last_dispatch);
   }

   if (intel_get_param(spriv, I915_PARAM_NUM_FENCES_AVAIL, &num_fences))
      intelScreen->kernel_exec_fencing = !!num_fences;
   else
      intelScreen->kernel_exec_fencing = GL_FALSE;

   return GL_TRUE;
}

/**
 * This is the driver specific part of the createNewScreen entry point.
 * Called when using legacy DRI.
 * 
 * \todo maybe fold this into intelInitDriver
 *
 * \return the __GLcontextModes supported by this driver
 */
static const __DRIconfig **intelInitScreen(__DRIscreenPrivate *psp)
{
   intelScreenPrivate *intelScreen;
#ifdef I915
   static const __DRIversion ddx_expected = { 1, 5, 0 };
#else
   static const __DRIversion ddx_expected = { 1, 6, 0 };
#endif
   static const __DRIversion dri_expected = { 4, 0, 0 };
   static const __DRIversion drm_expected = { 1, 5, 0 };
   I830DRIPtr dri_priv = (I830DRIPtr) psp->pDevPriv;

   if (!driCheckDriDdxDrmVersions2("i915",
                                   &psp->dri_version, &dri_expected,
                                   &psp->ddx_version, &ddx_expected,
                                   &psp->drm_version, &drm_expected)) {
      return NULL;
   }

   /* Calling driInitExtensions here, with a NULL context pointer,
    * does not actually enable the extensions.  It just makes sure
    * that all the dispatch offsets for all the extensions that
    * *might* be enables are known.  This is needed because the
    * dispatch offsets need to be known when _mesa_context_create is
    * called, but we can't enable the extensions until we have a
    * context pointer.
    *
    * Hello chicken.  Hello egg.  How are you two today?
    */
   intelInitExtensions(NULL, GL_TRUE);
	   
   if (!intelInitDriver(psp))
       return NULL;

   psp->extensions = intelScreenExtensions;

   intelScreen = psp->private;
   if (!intel_init_bufmgr(intelScreen))
       return GL_FALSE;

   return (const __DRIconfig **)
       intelFillInModes(psp, dri_priv->cpp * 8,
			(dri_priv->cpp == 2) ? 16 : 24,
			(dri_priv->cpp == 2) ? 0  : 8, 1);
}

struct intel_context *intelScreenContext(intelScreenPrivate *intelScreen)
{
  /*
   * This should probably change to have the screen allocate a dummy
   * context at screen creation. For now just use the current context.
   */

  GET_CURRENT_CONTEXT(ctx);
  if (ctx == NULL) {
     _mesa_problem(NULL, "No current context in intelScreenContext\n");
     return NULL;
  }
  return intel_context(ctx);
}

/**
 * This is the driver specific part of the createNewScreen entry point.
 * Called when using DRI2.
 *
 * \return the __GLcontextModes supported by this driver
 */
static const
__DRIconfig **intelInitScreen2(__DRIscreenPrivate *psp)
{
   intelScreenPrivate *intelScreen;
   GLenum fb_format[3];
   GLenum fb_type[3];
   /* GLX_SWAP_COPY_OML is only supported because the Intel 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[4], stencil_bits[4], msaa_samples_array[1];
   int color;
   __DRIconfig **configs = NULL;

   /* Calling driInitExtensions here, with a NULL context pointer,
    * does not actually enable the extensions.  It just makes sure
    * that all the dispatch offsets for all the extensions that
    * *might* be enables are known.  This is needed because the
    * dispatch offsets need to be known when _mesa_context_create is
    * called, but we can't enable the extensions until we have a
    * context pointer.
    *
    * Hello chicken.  Hello egg.  How are you two today?
    */
   intelInitExtensions(NULL, GL_TRUE);

   /* Allocate the private area */
   intelScreen = (intelScreenPrivate *) CALLOC(sizeof(intelScreenPrivate));
   if (!intelScreen) {
      fprintf(stderr, "\nERROR!  Allocating private area failed\n");
      return GL_FALSE;
   }
   /* parse information in __driConfigOptions */
   driParseOptionInfo(&intelScreen->optionCache,
                      __driConfigOptions, __driNConfigOptions);

   intelScreen->driScrnPriv = psp;
   psp->private = (void *) intelScreen;

   intelScreen->drmMinor = psp->drm_version.minor;

   /* Determine chipset ID */
   if (!intel_get_param(psp, I915_PARAM_CHIPSET_ID,
			&intelScreen->deviceID))
      return GL_FALSE;

   if (!intel_init_bufmgr(intelScreen))
       return GL_FALSE;

   intelScreen->irq_active = 1;
   psp->extensions = intelScreenExtensions;

   depth_bits[0] = 0;
   stencil_bits[0] = 0;
   depth_bits[1] = 16;
   stencil_bits[1] = 0;
   depth_bits[2] = 24;
   stencil_bits[2] = 0;
   depth_bits[3] = 24;
   stencil_bits[3] = 8;

   msaa_samples_array[0] = 0;

   fb_format[0] = GL_RGB;
   fb_type[0] = GL_UNSIGNED_SHORT_5_6_5;

   fb_format[1] = GL_BGR;
   fb_type[1] = GL_UNSIGNED_INT_8_8_8_8_REV;

   fb_format[2] = GL_BGRA;
   fb_type[2] = GL_UNSIGNED_INT_8_8_8_8_REV;

   depth_bits[0] = 0;
   stencil_bits[0] = 0;

   for (color = 0; color < ARRAY_SIZE(fb_format); color++) {
      __DRIconfig **new_configs;
      int depth_factor;

      /* With DRI2 right now, GetBuffers always returns a depth/stencil buffer
       * with the same cpp as the drawable.  So we can't support depth cpp !=
       * color cpp currently.
       */
      if (fb_type[color] == GL_UNSIGNED_SHORT_5_6_5) {
	 depth_bits[1] = 16;
	 stencil_bits[1] = 0;

	 depth_factor = 2;
      } else {
	 depth_bits[1] = 24;
	 stencil_bits[1] = 0;
	 depth_bits[2] = 24;
	 stencil_bits[2] = 8;

	 depth_factor = 3;
      }
      new_configs = driCreateConfigs(fb_format[color], fb_type[color],
				     depth_bits,
				     stencil_bits,
				     depth_factor,
				     back_buffer_modes,
				     ARRAY_SIZE(back_buffer_modes),
				     msaa_samples_array,
				     ARRAY_SIZE(msaa_samples_array));
      if (configs == NULL)
	 configs = new_configs;
      else
	 configs = driConcatConfigs(configs, new_configs);
   }

   if (configs == NULL) {
      fprintf(stderr, "[%s:%u] Error creating FBConfig!\n", __func__,
              __LINE__);
      return NULL;
   }

   return (const __DRIconfig **)configs;
}

const struct __DriverAPIRec driDriverAPI = {
   .InitScreen		 = intelInitScreen,
   .DestroyScreen	 = intelDestroyScreen,
   .CreateContext	 = intelCreateContext,
   .DestroyContext	 = intelDestroyContext,
   .CreateBuffer	 = intelCreateBuffer,
   .DestroyBuffer	 = intelDestroyBuffer,
   .SwapBuffers		 = intelSwapBuffers,
   .MakeCurrent		 = intelMakeCurrent,
   .UnbindContext	 = intelUnbindContext,
   .GetSwapInfo		 = intelGetSwapInfo,
   .GetDrawableMSC	 = driDrawableGetMSC32,
   .WaitForMSC		 = driWaitForMSC32,
   .CopySubBuffer	 = intelCopySubBuffer,

   .InitScreen2		 = intelInitScreen2,
};