summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/i965/intel_context.c
blob: 0866c5ccc6e2df4837c81cf0d9c2bbac83568e27 (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
/**************************************************************************
 * 
 * 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 "glheader.h"
#include "context.h"
#include "matrix.h"
#include "simple_list.h"
#include "extensions.h"
#include "framebuffer.h"
#include "imports.h"
#include "points.h"

#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "vbo/vbo.h"

#include "tnl/t_pipeline.h"
#include "tnl/t_vertex.h"

#include "drivers/common/driverfuncs.h"

#include "intel_screen.h"
#include "intel_chipset.h"

#include "i830_dri.h"
#include "i830_common.h"

#include "intel_tex.h"
#include "intel_span.h"
#include "intel_ioctl.h"
#include "intel_batchbuffer.h"
#include "intel_blit.h"
#include "intel_regions.h"
#include "intel_buffers.h"
#include "intel_buffer_objects.h"
#include "intel_decode.h"
#include "intel_fbo.h"
#include "intel_bufmgr_ttm.h"

#include "drirenderbuffer.h"
#include "i915_drm.h"

#include "utils.h"
#include "vblank.h"
#ifndef INTEL_DEBUG
int INTEL_DEBUG = (0);
#endif

#define need_GL_NV_point_sprite
#define need_GL_ARB_multisample
#define need_GL_ARB_point_parameters
#define need_GL_ARB_texture_compression
#define need_GL_ARB_vertex_buffer_object
#define need_GL_ARB_vertex_program
#define need_GL_ARB_window_pos
#define need_GL_ARB_occlusion_query
#define need_GL_EXT_blend_color
#define need_GL_EXT_blend_equation_separate
#define need_GL_EXT_blend_func_separate
#define need_GL_EXT_blend_minmax
#define need_GL_EXT_cull_vertex
#define need_GL_EXT_fog_coord
#define need_GL_EXT_framebuffer_object
#define need_GL_EXT_multi_draw_arrays
#define need_GL_EXT_secondary_color
#define need_GL_ATI_separate_stencil
#define need_GL_EXT_point_parameters
#define need_GL_VERSION_2_0
#define need_GL_VERSION_2_1
#define need_GL_ARB_shader_objects
#define need_GL_ARB_vertex_shader

#include "extension_helper.h"

#ifndef VERBOSE
int VERBOSE = 0;
#endif

/***************************************
 * Mesa's Driver Functions
 ***************************************/

#define DRIVER_VERSION                     "4.1.3002"

static const GLubyte *intelGetString( GLcontext *ctx, GLenum name )
{
   const char * chipset;
   static char buffer[128];

   switch (name) {
   case GL_VENDOR:
      return (GLubyte *)"Tungsten Graphics, Inc";
      break;
      
   case GL_RENDERER:
      switch (intel_context(ctx)->intelScreen->deviceID) {
      case PCI_CHIP_I965_Q:
	 chipset = "Intel(R) 965Q";
         break;
      case PCI_CHIP_I965_G:
      case PCI_CHIP_I965_G_1:
	 chipset = "Intel(R) 965G";
         break;
      case PCI_CHIP_I946_GZ:
	 chipset = "Intel(R) 946GZ";
         break;
      case PCI_CHIP_I965_GM:
	 chipset = "Intel(R) 965GM";
         break;
      case PCI_CHIP_I965_GME:
	 chipset = "Intel(R) 965GME/GLE";
         break;
      default:
	 chipset = "Unknown Intel Chipset";
      }

      (void) driGetRendererString( buffer, chipset, DRIVER_VERSION, 0 );
      return (GLubyte *) buffer;

   default:
      return NULL;
   }
}


/**
 * Extension strings exported by the intel driver.
 *
 * \note
 * It appears that ARB_texture_env_crossbar has "disappeared" compared to the
 * old i830-specific driver.
 */
const struct dri_extension card_extensions[] =
{
    { "GL_ARB_multisample",                GL_ARB_multisample_functions },
    { "GL_ARB_multitexture",               NULL },
    { "GL_ARB_point_parameters",           GL_ARB_point_parameters_functions },
    { "GL_NV_point_sprite",                GL_NV_point_sprite_functions },
    { "GL_ARB_texture_border_clamp",       NULL },
    { "GL_ARB_texture_compression",        GL_ARB_texture_compression_functions },
    { "GL_ARB_texture_cube_map",           NULL },
    { "GL_ARB_texture_env_add",            NULL },
    { "GL_ARB_texture_env_combine",        NULL },
    { "GL_ARB_texture_env_dot3",           NULL },
    { "GL_ARB_texture_mirrored_repeat",    NULL },
    { "GL_ARB_texture_non_power_of_two",   NULL },
    { "GL_ARB_texture_rectangle",          NULL },
    { "GL_NV_texture_rectangle",           NULL },
    { "GL_EXT_texture_rectangle",          NULL },
    { "GL_ARB_texture_rectangle",          NULL },
    { "GL_ARB_point_sprite",               NULL},
    { "GL_ARB_point_parameters",	   NULL }, 
    { "GL_ARB_vertex_buffer_object",       GL_ARB_vertex_buffer_object_functions },
    { "GL_ARB_vertex_program",             GL_ARB_vertex_program_functions },
    { "GL_ARB_window_pos",                 GL_ARB_window_pos_functions },
    { "GL_EXT_blend_color",                GL_EXT_blend_color_functions },
    { "GL_EXT_blend_equation_separate",    GL_EXT_blend_equation_separate_functions },
    { "GL_EXT_blend_func_separate",        GL_EXT_blend_func_separate_functions },
    { "GL_EXT_blend_minmax",               GL_EXT_blend_minmax_functions },
    { "GL_EXT_blend_logic_op",             NULL },
    { "GL_EXT_blend_subtract",             NULL },
    { "GL_EXT_cull_vertex",                GL_EXT_cull_vertex_functions },
    { "GL_EXT_fog_coord",                  GL_EXT_fog_coord_functions },
    { "GL_EXT_multi_draw_arrays",          GL_EXT_multi_draw_arrays_functions },
    { "GL_EXT_secondary_color",            GL_EXT_secondary_color_functions },
    { "GL_ATI_separate_stencil",           GL_ATI_separate_stencil_functions },
    { "GL_EXT_stencil_wrap",               NULL },
    /* Do not enable this extension.  It conflicts with GL_ATI_separate_stencil
     * and 2.0's separate stencil, because mesa's computed _TestTwoSide will
     * only reflect whether it's enabled through this extension, even if the
     * application is using the other interfaces.
     */
/*{ "GL_EXT_stencil_two_side",           GL_EXT_stencil_two_side_functions },*/
    { "GL_EXT_texture_edge_clamp",         NULL },
    { "GL_EXT_texture_env_combine",        NULL },
    { "GL_EXT_texture_env_dot3",           NULL },
    { "GL_EXT_texture_filter_anisotropic", NULL },
    { "GL_EXT_texture_lod_bias",           NULL },
    { "GL_EXT_texture_sRGB",               NULL },
    { "GL_3DFX_texture_compression_FXT1",  NULL },
    { "GL_APPLE_client_storage",           NULL },
    { "GL_MESA_pack_invert",               NULL },
    { "GL_MESA_ycbcr_texture",             NULL },
    { "GL_NV_blend_square",                NULL },
    { "GL_SGIS_generate_mipmap",           NULL },
    { "GL_ARB_shading_language_100",       GL_VERSION_2_0_functions},
    { "GL_ARB_shading_language_120",       GL_VERSION_2_1_functions},
    { "GL_ARB_shader_objects",             GL_ARB_shader_objects_functions},
    { "GL_ARB_vertex_shader",              GL_ARB_vertex_shader_functions},
    { "GL_ARB_fragment_shader",            NULL },
    { "GL_ARB_draw_buffers",               NULL },
    { NULL,                                NULL }
};

const struct dri_extension ttm_extensions[] = {
   {"GL_EXT_framebuffer_object", GL_EXT_framebuffer_object_functions},
   {"GL_ARB_pixel_buffer_object", NULL},
   {NULL, NULL}
};

const struct dri_extension arb_oc_extension = 
    { "GL_ARB_occlusion_query",            GL_ARB_occlusion_query_functions};

/**
 * Initializes potential list of extensions if ctx == NULL, or actually enables
 * extensions for a context.
 */
void intelInitExtensions(GLcontext *ctx, GLboolean enable_imaging)
{
   struct intel_context *intel = ctx?intel_context(ctx):NULL;

   /* Disable imaging extension until convolution is working in teximage paths.
    */
   enable_imaging = GL_FALSE;

   driInitExtensions(ctx, card_extensions, enable_imaging);

   if (intel == NULL || intel->ttm)
      driInitExtensions(ctx, ttm_extensions, GL_FALSE);

   if (intel == NULL || intel->intelScreen->drmMinor >= 8)
      driInitSingleExtension(ctx, &arb_oc_extension);
}

static const struct dri_debug_control debug_control[] =
{
    { "fall",  DEBUG_FALLBACKS },
    { "tex",   DEBUG_TEXTURE },
    { "ioctl", DEBUG_IOCTL },
    { "prim",  DEBUG_PRIMS },
    { "vert",  DEBUG_VERTS },
    { "state", DEBUG_STATE },
    { "verb",  DEBUG_VERBOSE },
    { "dri",   DEBUG_DRI },
    { "dma",   DEBUG_DMA },
    { "san",   DEBUG_SANITY },
    { "sync",  DEBUG_SYNC },
    { "sleep", DEBUG_SLEEP },
    { "pix",   DEBUG_PIXEL },
    { "buf",   DEBUG_BUFMGR },
    { "stats", DEBUG_STATS },
    { "tile",  DEBUG_TILE },
    { "sing",  DEBUG_SINGLE_THREAD },
    { "thre",  DEBUG_SINGLE_THREAD },
    { "wm",    DEBUG_WM },
    { "vs",    DEBUG_VS },
    { "bat",   DEBUG_BATCH },
    { "blit",  DEBUG_BLIT},
    { "mip",   DEBUG_MIPTREE},
    { "reg",   DEBUG_REGION},
    { "fbo",   DEBUG_FBO },
    { NULL,    0 }
};


static void intelInvalidateState( GLcontext *ctx, GLuint new_state )
{
   struct intel_context *intel = intel_context(ctx);

   _swrast_InvalidateState( ctx, new_state );
   _swsetup_InvalidateState( ctx, new_state );
   _vbo_InvalidateState( ctx, new_state );
   _tnl_InvalidateState( ctx, new_state );
   _tnl_invalidate_vertex_state( ctx, new_state );
   
   intel->NewGLState |= new_state;

   if (intel->vtbl.invalidate_state)
      intel->vtbl.invalidate_state( intel, new_state );
}


void intelFlush( GLcontext *ctx )
{
   struct intel_context *intel = intel_context( ctx );

   if (intel->batch->map != intel->batch->ptr)
      intel_batchbuffer_flush(intel->batch);
}

void intelFinish( GLcontext *ctx ) 
{
   struct intel_context *intel = intel_context( ctx );

   intelFlush(ctx);
   if (intel->batch->last_fence) {
      dri_fence_wait(intel->batch->last_fence);
      dri_fence_unreference(intel->batch->last_fence);
      intel->batch->last_fence = NULL;
   }
}

static void
intelBeginQuery(GLcontext *ctx, GLenum target, struct gl_query_object *q)
{
	struct intel_context *intel = intel_context( ctx );
	drmI830MMIO io = {
		.read_write = MMIO_READ,
		.reg = MMIO_REGS_PS_DEPTH_COUNT,
		.data = &q->Result 
	};
	intel->stats_wm++;
	intelFinish(&intel->ctx);
	drmCommandWrite(intel->driFd, DRM_I830_MMIO, &io, sizeof(io));
}

static void
intelEndQuery(GLcontext *ctx, GLenum target, struct gl_query_object *q)
{
	struct intel_context *intel = intel_context( ctx );
	GLuint64EXT tmp;	
	drmI830MMIO io = {
		.read_write = MMIO_READ,
		.reg = MMIO_REGS_PS_DEPTH_COUNT,
		.data = &tmp
	};
	intelFinish(&intel->ctx);
	drmCommandWrite(intel->driFd, DRM_I830_MMIO, &io, sizeof(io));
	q->Result = tmp - q->Result;
	q->Ready = GL_TRUE;
	intel->stats_wm--;
}

/** Driver-specific fence emit implementation for the fake memory manager. */
static unsigned int
intel_fence_emit(void *private)
{
   struct intel_context *intel = (struct intel_context *)private;
   unsigned int fence;

   /* XXX: Need to emit a flush, if we haven't already (at least with the
    * current batchbuffer implementation, we have).
    */

   fence = intelEmitIrqLocked(intel);

   return fence;
}

/** Driver-specific fence wait implementation for the fake memory manager. */
static int
intel_fence_wait(void *private, unsigned int cookie)
{
   struct intel_context *intel = (struct intel_context *)private;

   intelWaitIrq(intel, cookie);

   return 0;
}

static GLboolean
intel_init_bufmgr(struct intel_context *intel)
{
   intelScreenPrivate *intelScreen = intel->intelScreen;
   GLboolean ttm_disable = getenv("INTEL_NO_TTM") != NULL;

   /* If we've got a new enough DDX that's initializing TTM and giving us
    * object handles for the shared buffers, use that.
    */
   intel->ttm = GL_FALSE;
   if (!ttm_disable &&
       intel->intelScreen->driScrnPriv->ddx_version.minor >= 9 &&
       intel->intelScreen->drmMinor >= 11 &&
       intel->intelScreen->front.bo_handle != -1)
   {
      intel->bufmgr = intel_bufmgr_ttm_init(intel->driFd,
					    DRM_FENCE_TYPE_EXE,
					    DRM_FENCE_TYPE_EXE |
					    DRM_I915_FENCE_TYPE_RW,
					    BATCH_SZ);
      if (intel->bufmgr != NULL)
	 intel->ttm = GL_TRUE;
   }
   /* Otherwise, use the classic buffer manager. */
   if (intel->bufmgr == NULL) {
      if (ttm_disable) {
	 fprintf(stderr, "TTM buffer manager disabled.  Using classic.\n");
      } else {
	 fprintf(stderr, "Failed to initialize TTM buffer manager.  "
		 "Falling back to classic.\n");
      }

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

      intel->bufmgr = dri_bufmgr_fake_init(intelScreen->tex.offset,
					   intelScreen->tex.map,
					   intelScreen->tex.size,
					   intel_fence_emit,
					   intel_fence_wait,
					   intel);
   }

   return GL_TRUE;
}


void intelInitDriverFunctions( struct dd_function_table *functions )
{
   _mesa_init_driver_functions( functions );

   functions->Flush = intelFlush;
   functions->Finish = intelFinish;
   functions->GetString = intelGetString;
   functions->UpdateState = intelInvalidateState;
   functions->BeginQuery = intelBeginQuery;
   functions->EndQuery = intelEndQuery;

   /* CopyPixels can be accelerated even with the current memory
    * manager:
    */
   if (!getenv("INTEL_NO_BLIT")) {
      functions->CopyPixels = intelCopyPixels;
      functions->Bitmap = intelBitmap;
   }

   intelInitTextureFuncs( functions );
   intelInitStateFuncs( functions );
   intelInitBufferFuncs( functions );
}

GLboolean intelInitContext( struct intel_context *intel,
			    const __GLcontextModes *mesaVis,
			    __DRIcontextPrivate *driContextPriv,
			    void *sharedContextPrivate,
			    struct dd_function_table *functions )
{
   GLcontext *ctx = &intel->ctx;
   GLcontext *shareCtx = (GLcontext *) sharedContextPrivate;
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *)sPriv->private;
   volatile drmI830Sarea *saPriv = (drmI830Sarea *)
     (((GLubyte *)sPriv->pSAREA)+intelScreen->sarea_priv_offset);

   if (!_mesa_initialize_context(&intel->ctx,
				 mesaVis, shareCtx, 
				 functions,
				 (void*) intel)) {
      _mesa_printf("%s: failed to init mesa context\n", __FUNCTION__);
      return GL_FALSE;
   }

   driContextPriv->driverPrivate = intel;
   intel->intelScreen = intelScreen;
   intel->driScreen = sPriv;
   intel->sarea = saPriv;

   /* Dri stuff */
   intel->hHWContext = driContextPriv->hHWContext;
   intel->driFd = sPriv->fd;
   intel->driHwLock = (drmLock *) &sPriv->pSAREA->lock;

   intel->maxBatchSize = BATCH_SZ;

   if (!intel_init_bufmgr(intel))
      return GL_FALSE;

   driParseConfigFiles (&intel->optionCache, &intelScreen->optionCache,
		   intel->driScreen->myNum, "i965");

   ctx->Const.MaxTextureMaxAnisotropy = 2.0;

   if (getenv("INTEL_STRICT_CONFORMANCE")) {
      intel->strict_conformance = 1;
   }

   if (intel->strict_conformance) {
      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;
   }
   else {
      ctx->Const.MinLineWidth = 1.0;
      ctx->Const.MinLineWidthAA = 1.0;
      ctx->Const.MaxLineWidth = 5.0;
      ctx->Const.MaxLineWidthAA = 5.0;
      ctx->Const.LineWidthGranularity = 0.5;
   }

   ctx->Const.MinPointSize = 1.0;
   ctx->Const.MinPointSizeAA = 1.0;
   ctx->Const.MaxPointSize = 255.0;
   ctx->Const.MaxPointSizeAA = 3.0;
   ctx->Const.PointSizeGranularity = 1.0;

   /* reinitialize the context point state.
    * It depend on constants in __GLcontextRec::Const
    */
   _mesa_init_point(ctx);

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

   TNL_CONTEXT(ctx)->Driver.RunPipeline = _tnl_run_pipeline;

   /* Configure swrast to match hardware characteristics: */
   _swrast_allow_pixel_fog( ctx, GL_FALSE );
   _swrast_allow_vertex_fog( ctx, GL_TRUE );

   intel->hw_stencil = mesaVis->stencilBits && mesaVis->depthBits == 24;
   intel->hw_stipple = 1;

   switch(mesaVis->depthBits) {
   case 0:			/* what to do in this case? */
   case 16:
      intel->polygon_offset_scale = 1.0/0xffff;
      break;
   case 24:
      intel->polygon_offset_scale = 2.0/0xffffff; /* req'd to pass glean */
      break;
   default:
      assert(0); 
      break;
   }

   /* Initialize swrast, tnl driver tables: */
   intelInitSpanFuncs( ctx );

   if (!intel->intelScreen->irq_active) {
      _mesa_printf("IRQs not active.  Exiting\n");
      exit(1);
   }
   intelInitExtensions(ctx, GL_TRUE); 

   INTEL_DEBUG  = driParseDebugString( getenv( "INTEL_DEBUG" ),
				       debug_control );
   if (INTEL_DEBUG & DEBUG_BUFMGR)
      dri_bufmgr_set_debug(intel->bufmgr, GL_TRUE);

   intel_recreate_static_regions(intel);

   intel_bufferobj_init( intel );
   intel_fbo_init( intel );

   intel->batch = intel_batchbuffer_alloc( intel );
   intel->last_swap_fence = NULL;
   intel->first_swap_fence = NULL;

   if (intel->ctx.Mesa_DXTn) {
      _mesa_enable_extension( ctx, "GL_EXT_texture_compression_s3tc" );
      _mesa_enable_extension( ctx, "GL_S3_s3tc" );
   }
   else if (driQueryOptionb (&intel->optionCache, "force_s3tc_enable")) {
      _mesa_enable_extension( ctx, "GL_EXT_texture_compression_s3tc" );
   }

/*    driInitTextureObjects( ctx, & intel->swapped, */
/* 			  DRI_TEXMGR_DO_TEXTURE_1D | */
/* 			  DRI_TEXMGR_DO_TEXTURE_2D |  */
/* 			  DRI_TEXMGR_DO_TEXTURE_RECT ); */

   /* Force all software fallbacks */
   if (getenv("INTEL_NO_RAST")) {
      fprintf(stderr, "disabling 3D rasterization\n");
      intel->no_rast = 1;
   }

   /* Disable all hardware rendering (skip emitting batches and fences/waits
    * to the kernel)
    */
   intel->no_hw = getenv("INTEL_NO_HW") != NULL;

   return GL_TRUE;
}

void intelDestroyContext(__DRIcontextPrivate *driContextPriv)
{
   struct intel_context *intel = (struct intel_context *) driContextPriv->driverPrivate;

   assert(intel); /* should never be null */
   if (intel) {
      GLboolean   release_texture_heaps;


      intel->vtbl.destroy( intel );

      release_texture_heaps = (intel->ctx.Shared->RefCount == 1);
      _swsetup_DestroyContext (&intel->ctx);
      _tnl_DestroyContext (&intel->ctx);
      _vbo_DestroyContext (&intel->ctx);

      _swrast_DestroyContext (&intel->ctx);
      intel->Fallback = 0;	/* don't call _swrast_Flush later */
      intel_batchbuffer_free(intel->batch);
      intel->batch = NULL;

      if (intel->last_swap_fence) {
	 dri_fence_wait(intel->last_swap_fence);
	 dri_fence_unreference(intel->last_swap_fence);
	 intel->last_swap_fence = NULL;
      }
      if (intel->first_swap_fence) {
	 dri_fence_wait(intel->first_swap_fence);
	 dri_fence_unreference(intel->first_swap_fence);
	 intel->first_swap_fence = NULL;
      }

      if ( release_texture_heaps ) {
         /* This share group is about to go away, free our private
          * texture object data.
          */

	 /* XXX: destroy the shared bufmgr struct here?
	  */
      }

      /* free the Mesa context */
      intel->ctx.VertexProgram.Current = NULL;
      intel->ctx.FragmentProgram.Current = NULL;
      _mesa_destroy_context(&intel->ctx);
   }

   driContextPriv->driverPrivate = NULL;
}

GLboolean intelUnbindContext(__DRIcontextPrivate *driContextPriv)
{
   return GL_TRUE;
}

GLboolean intelMakeCurrent(__DRIcontextPrivate *driContextPriv,
			  __DRIdrawablePrivate *driDrawPriv,
			  __DRIdrawablePrivate *driReadPriv)
{

   if (driContextPriv) {
      struct intel_context *intel =
	 (struct intel_context *) driContextPriv->driverPrivate;
      struct intel_framebuffer *intel_fb =
	 (struct intel_framebuffer *) driDrawPriv->driverPrivate;
      GLframebuffer *readFb = (GLframebuffer *) driReadPriv->driverPrivate;

      /* XXX FBO temporary fix-ups! */
      /* if the renderbuffers don't have regions, init them from the context.
       * They will be unreferenced when the renderbuffer is destroyed.
       */
      {
         struct intel_renderbuffer *irbDepth
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_DEPTH);
         struct intel_renderbuffer *irbStencil
            = intel_get_renderbuffer(&intel_fb->Base, BUFFER_STENCIL);

         if (intel_fb->color_rb[0] && !intel_fb->color_rb[0]->region) {
            intel_region_reference(&intel_fb->color_rb[0]->region,
				   intel->front_region);
         }
         if (intel_fb->color_rb[1] && !intel_fb->color_rb[1]->region) {
            intel_region_reference(&intel_fb->color_rb[1]->region,
				   intel->back_region);
         }
         if (intel_fb->color_rb[2] && !intel_fb->color_rb[2]->region) {
            intel_region_reference(&intel_fb->color_rb[2]->region,
				   intel->third_region);
         }
         if (irbDepth && !irbDepth->region) {
            intel_region_reference(&irbDepth->region, intel->depth_region);
         }
         if (irbStencil && !irbStencil->region) {
            intel_region_reference(&irbStencil->region, intel->depth_region);
         }
      }

      /* set GLframebuffer size to match window, if needed */
      driUpdateFramebufferSize(&intel->ctx, driDrawPriv);

      if (intel->driReadDrawable != driReadPriv) {
          intel->driReadDrawable = driReadPriv;
      }

      if ( intel->driDrawable != driDrawPriv ) {
	 if (driDrawPriv->swap_interval == (unsigned)-1) {
	    driDrawPriv->vblFlags = (intel->intelScreen->irq_active != 0)
	       ? driGetDefaultVBlankFlags(&intel->optionCache)
	       : VBLANK_FLAG_NO_IRQ;
	    driDrawableInitVBlank( driDrawPriv );
	 }

	 intel->driDrawable = driDrawPriv;
	 intelWindowMoved( intel );
	 /* Shouldn't the readbuffer be stored also? */
      }

      _mesa_make_current(&intel->ctx,
			 &intel_fb->Base,
			 readFb);

      intel_draw_buffer(&intel->ctx, &intel_fb->Base);
   } else {
      _mesa_make_current(NULL, NULL, NULL);
   }

   return GL_TRUE;
}


static void intelContendedLock( struct intel_context *intel, GLuint flags )
{
   __DRIdrawablePrivate *dPriv = intel->driDrawable;
   __DRIscreenPrivate *sPriv = intel->driScreen;
   volatile drmI830Sarea * sarea = intel->sarea;
   int me = intel->hHWContext;

   drmGetLock(intel->driFd, intel->hHWContext, flags);

   /* If the window moved, may need to set a new cliprect now.
    *
    * NOTE: This releases and regains the hw lock, so all state
    * checking must be done *after* this call:
    */
   if (dPriv)
      DRI_VALIDATE_DRAWABLE_INFO(sPriv, dPriv);


   intel->locked = 1;
   intel->need_flush = 1;

   /* Lost context?
    */
   if (sarea->ctxOwner != me) {
      if (INTEL_DEBUG & DEBUG_BUFMGR) {
	 fprintf(stderr, "Lost Context: sarea->ctxOwner %x me %x\n",
		 sarea->ctxOwner, me);
      }
      sarea->ctxOwner = me;
      intel->vtbl.lost_hardware( intel );
   }

   /* If the last consumer of the texture memory wasn't us, notify the fake
    * bufmgr and record the new owner.  We should have the memory shared
    * between contexts of a single fake bufmgr, but this will at least make
    * things correct for now.
    */
   if (!intel->ttm && sarea->texAge != intel->hHWContext) {
      sarea->texAge = intel->hHWContext;
      dri_bufmgr_fake_contended_lock_take(intel->bufmgr);
      if (INTEL_DEBUG & DEBUG_BATCH)
	 intel_decode_context_reset();
      if (INTEL_DEBUG & DEBUG_BUFMGR) {
	 fprintf(stderr, "Lost Textures: sarea->texAge %x hw context %x\n",
		 sarea->ctxOwner, intel->hHWContext);
      }
   }

   /* Drawable changed?
    */
   if (dPriv && intel->lastStamp != dPriv->lastStamp) {
      intelWindowMoved( intel );
      intel->lastStamp = dPriv->lastStamp;
   }
}

_glthread_DECLARE_STATIC_MUTEX(lockMutex);

/* Lock the hardware and validate our state.  
 */
void LOCK_HARDWARE( struct intel_context *intel )
{
    char __ret=0;

    _glthread_LOCK_MUTEX(lockMutex);
    assert(!intel->locked);


    DRM_CAS(intel->driHwLock, intel->hHWContext,
	    (DRM_LOCK_HELD|intel->hHWContext), __ret);
    if (__ret)
        intelContendedLock( intel, 0 );

   intel->locked = 1;

}
 
  
/* Unlock the hardware using the global current context 
 */
void UNLOCK_HARDWARE( struct intel_context *intel )
{
   intel->vtbl.note_unlock( intel );
   intel->locked = 0;

   DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);
   _glthread_UNLOCK_MUTEX(lockMutex); 
}