summaryrefslogtreecommitdiff
path: root/src/mesa/drivers/dri/i915pipe/intel_context.c
blob: ced4366009a645f3aa3c96e157eee8a27a43e7ff (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
/**************************************************************************
 * 
 * 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 "tnl/tnl.h"

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

#include "drivers/common/driverfuncs.h"

#include "intel_screen.h"

#include "i830_dri.h"

#include "intel_buffers.h"
/*#include "intel_tex.h"*/
#include "intel_ioctl.h"
#include "intel_batchbuffer.h"
#include "intel_blit.h"
#include "intel_buffer_objects.h"
#include "intel_fbo.h"
#include "intel_tex_layout.h"

#include "state_tracker/st_public.h"
#include "state_tracker/st_context.h"

#include "drirenderbuffer.h"
#include "vblank.h"
#include "utils.h"
#include "xmlpool.h"            /* for symbolic values of enum-type options */

#include "pipe/p_context.h"



#ifndef INTEL_DEBUG
int INTEL_DEBUG = (0);
#endif

#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_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_NV_vertex_program
#include "extension_helper.h"


#define DRIVER_DATE                     "20070731"

_glthread_Mutex lockMutex;
static GLboolean lockMutexInit = GL_FALSE;


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_845_G:
         chipset = "Intel(R) 845G";
         break;
      case PCI_CHIP_I830_M:
         chipset = "Intel(R) 830M";
         break;
      case PCI_CHIP_I855_GM:
         chipset = "Intel(R) 852GM/855GM";
         break;
      case PCI_CHIP_I865_G:
         chipset = "Intel(R) 865G";
         break;
      case PCI_CHIP_I915_G:
         chipset = "Intel(R) 915G";
         break;
      case PCI_CHIP_I915_GM:
         chipset = "Intel(R) 915GM";
         break;
      case PCI_CHIP_I945_G:
         chipset = "Intel(R) 945G";
         break;
      case PCI_CHIP_I945_GM:
         chipset = "Intel(R) 945GM";
         break;
      case PCI_CHIP_I945_GME:
         chipset = "Intel(R) 945GME";
         break;
      case PCI_CHIP_G33_G:
	 chipset = "Intel(R) G33";
	 break;
      case PCI_CHIP_Q35_G:
	 chipset = "Intel(R) Q35";
	 break;
      case PCI_CHIP_Q33_G:
	 chipset = "Intel(R) Q33";
	 break;
      default:
         chipset = "Unknown Intel Chipset";
         break;
      }

      (void) driGetRendererString(buffer, chipset, DRIVER_DATE, 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_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_rectangle", NULL},
   {"GL_ARB_vertex_buffer_object", GL_ARB_vertex_buffer_object_functions},
   {"GL_ARB_pixel_buffer_object", NULL},
   {"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_subtract", NULL},
   {"GL_EXT_cull_vertex", GL_EXT_cull_vertex_functions},
   {"GL_EXT_fog_coord", GL_EXT_fog_coord_functions},
   {"GL_EXT_framebuffer_object", GL_EXT_framebuffer_object_functions},
   {"GL_EXT_multi_draw_arrays", GL_EXT_multi_draw_arrays_functions},
#if 1                           /* XXX FBO temporary? */
   {"GL_EXT_packed_depth_stencil", NULL},
#endif
   {"GL_EXT_pixel_buffer_object", NULL},
   {"GL_EXT_secondary_color", GL_EXT_secondary_color_functions},
   {"GL_EXT_stencil_wrap", NULL},
   {"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_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_NV_vertex_program", GL_NV_vertex_program_functions},
   {"GL_NV_vertex_program1_1", NULL},
/*     { "GL_SGIS_generate_mipmap",           NULL }, */
   {NULL, NULL}
};




static const struct dri_debug_control debug_control[] = {
   {"tex", DEBUG_TEXTURE},
   {"state", DEBUG_STATE},
   {"ioctl", DEBUG_IOCTL},
   {"blit", DEBUG_BLIT},
   {"mip", DEBUG_MIPTREE},
   {"fall", DEBUG_FALLBACKS},
   {"verb", DEBUG_VERBOSE},
   {"bat", DEBUG_BATCH},
   {"pix", DEBUG_PIXEL},
   {"buf", DEBUG_BUFMGR},
   {"reg", DEBUG_REGION},
   {"fbo", DEBUG_FBO},
   {"lock", DEBUG_LOCK},
   {NULL, 0}
};


static void
intelInvalidateState(GLcontext * ctx, GLuint new_state)
{
   _vbo_InvalidateState(ctx, new_state);
   _tnl_InvalidateState(ctx, new_state);
   _tnl_invalidate_vertex_state(ctx, new_state);

   st_invalidate_state( ctx, new_state );
}


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

   INTEL_FIREVERTICES(intel);

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

   /* XXX: Need to do an MI_FLUSH here.
    */
}


/**
 * Check if we need to rotate/warp the front color buffer to the
 * rotated screen.  We generally need to do this when we get a glFlush
 * or glFinish after drawing to the front color buffer.
 * If no rotation, just copy the private fake front buffer to the real one.
 */
static void
intelCheckFrontUpdate(GLcontext * ctx)
{
   struct intel_context *intel = intel_context(ctx);
   /* rely on _ColorDrawBufferMask being kept up to date by mesa
      even for window-fbos. */
   /* not sure. Might need that for all masks including
      BUFFER_BIT_FRONT_LEFT maybe? */
   if (intel->ctx.DrawBuffer->_ColorDrawBufferMask[0] ==
       BUFFER_BIT_FRONT_LEFT) {
      __DRIdrawablePrivate *dPriv = intel->driDrawable;
      intelCopyBuffer(dPriv, NULL);
   }
}


/**
 * Called via glFlush.
 */
static void
intelglFlush(GLcontext * ctx)
{
   intelFlush(ctx);
   intelCheckFrontUpdate(ctx);
}

void
intelFinish(GLcontext * ctx)
{
   struct intel_context *intel = intel_context(ctx);
   intelFlush(ctx);
   if (intel->batch->last_fence) {
      driFenceFinish(intel->batch->last_fence,
                     0, GL_FALSE);
      driFenceUnReference(intel->batch->last_fence);
      intel->batch->last_fence = NULL;
   }
   intelCheckFrontUpdate(ctx);
}


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

   functions->Flush = intelglFlush;
   functions->Finish = intelFinish;
   functions->GetString = intelGetString;
   functions->UpdateState = intelInvalidateState;

   /*
   intelInitTextureFuncs(functions);
   */
   intelInitBufferFuncs(functions);
}



GLboolean
intelCreateContext(const __GLcontextModes * mesaVis,
                   __DRIcontextPrivate * driContextPriv,
                   void *sharedContextPrivate)
{
   struct dd_function_table functions;
   
   struct intel_context *intel = CALLOC_STRUCT(intel_context);
   GLcontext *ctx = &intel->ctx;

   GLcontext *shareCtx = (GLcontext *) sharedContextPrivate;
   __DRIscreenPrivate *sPriv = driContextPriv->driScreenPriv;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
   drmI830Sarea *saPriv = intelScreen->sarea;
   int fthrottle_mode;
   GLboolean havePools;

   intelInitDriverFunctions(&functions);

   if (!_mesa_initialize_context(&intel->ctx,
                                 mesaVis, shareCtx,
                                 &functions, (void *) intel))
      return GL_FALSE;

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

   if (!lockMutexInit) {
      lockMutexInit = GL_TRUE;
      _glthread_INIT_MUTEX(lockMutex);
   }

   driParseConfigFiles(&intel->optionCache, &intelScreen->optionCache,
                       intel->driScreen->myNum, "i915");


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

   /*
    * Pipe-related setup
    */
   st_create_context( &intel->ctx,
		      intel_create_softpipe( intel ) );

   /* KW: Not sure I like this - we should only be talking to the
    * state_tracker.  The pipe code will need some way of talking to
    * us, eg for batchbuffer ioctls, and there will need to be a
    * buffer manager interface.  So, this is a temporary hack, right?
    * BP: Yes, a temporary hack so we can make jumps between old/new code.
    */
   intel->pipe = intel->ctx.st->pipe;
//   intel->pipe->screen = intelScreen;
//   intel->pipe->glctx = ctx;
//   intel_init_region_functions(intel->pipe);

   switch (intel->intelScreen->deviceID) {
   case PCI_CHIP_I945_G:
   case PCI_CHIP_I945_GM:
   case PCI_CHIP_I945_GME:
   case PCI_CHIP_G33_G:
   case PCI_CHIP_Q33_G:
   case PCI_CHIP_Q35_G:
      intel->pipe->mipmap_tree_layout = i945_miptree_layout;
      break;
   case PCI_CHIP_I915_G:
   case PCI_CHIP_I915_GM:
   case PCI_CHIP_I830_M:
   case PCI_CHIP_I855_GM:
   case PCI_CHIP_I865_G:
      intel->pipe->mipmap_tree_layout = i915_miptree_layout;
   default:
      assert(0); /*FIX*/
   }


   /*
    * memory pools
    */
   DRM_LIGHT_LOCK(sPriv->fd, &sPriv->pSAREA->lock, driContextPriv->hHWContext);
   havePools = intelCreatePools(intelScreen);
   DRM_UNLOCK(sPriv->fd, &sPriv->pSAREA->lock, driContextPriv->hHWContext);
   if (!havePools)
      return GL_FALSE;


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

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



   fthrottle_mode = driQueryOptioni(&intel->optionCache, "fthrottle_mode");
   intel->iw.irq_seq = -1;
   intel->irqsEmitted = 0;

   /* Disable imaging extension until convolution is working in
    * teximage paths:
    */
   driInitExtensions(ctx, card_extensions,
/* 		      GL_TRUE, */
                     GL_FALSE);


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

   intel_bufferobj_init(intel);
   intel_fbo_init(intel);

   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");
   }

#if DO_DEBUG
   INTEL_DEBUG = driParseDebugString(getenv("INTEL_DEBUG"), debug_control);
#endif


   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_FIREVERTICES(intel);

      //intel->vtbl.destroy(intel);

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

      intel_batchbuffer_free(intel->batch);

      if (intel->last_swap_fence) {
	 driFenceFinish(intel->last_swap_fence, DRM_FENCE_TYPE_EXE, GL_TRUE);
	 driFenceUnReference(intel->last_swap_fence);
	 intel->last_swap_fence = NULL;
      }
      if (intel->first_swap_fence) {
	 driFenceFinish(intel->first_swap_fence, DRM_FENCE_TYPE_EXE, GL_TRUE);
	 driFenceUnReference(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.
          */
         if (INTEL_DEBUG & DEBUG_TEXTURE)
            fprintf(stderr, "do something to free texture heaps\n");
      }

      /* free the Mesa context */
      _mesa_free_context_data(&intel->ctx);
   }
}

GLboolean
intelUnbindContext(__DRIcontextPrivate * driContextPriv)
{
   struct intel_context *intel = (struct intel_context *) driContextPriv->driverPrivate;
   /* XXX UnbindContext is called AFTER the new context is made current.
      Hopefully shouldn't be a problem ? */
   FLUSH_VERTICES((&intel->ctx), 0);
   intelFlush(&intel->ctx);
   return GL_TRUE;
}

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

#if 0
   if (driDrawPriv) {
      fprintf(stderr, "x %d, y %d, width %d, height %d\n",
	      driDrawPriv->x, driDrawPriv->y, driDrawPriv->w, driDrawPriv->h);
   }
#endif

   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;

      /* this is a hack so we have a valid context when the region allocation
         is done. Need a per-screen context? */
      intel->intelScreen->dummyctxptr = intel;

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

      if (driReadPriv != driDrawPriv) {
         driUpdateFramebufferSize(&intel->ctx, driReadPriv);
      }

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

      /* The drawbuffer won't always be updated by _mesa_make_current: 
       */
      if (intel->ctx.DrawBuffer == &intel_fb->Base) {

	 if (intel->driDrawable != driDrawPriv) {
	    if (driDrawPriv->pdraw->swap_interval == (unsigned)-1) {
	       int i;

	       intel_fb->vblank_flags = driGetDefaultVBlankFlags(&intel->optionCache);

	       (*dri_interface->getUST) (&intel_fb->swap_ust);
	       driDrawableInitVBlank(driDrawPriv, intel_fb->vblank_flags,
				     &intel_fb->vbl_seq);
	       intel_fb->vbl_waited = intel_fb->vbl_seq;

	       for (i = 0; i < 2; i++) {
		  if (intel_fb->color_rb[i])
		     intel_fb->color_rb[i]->vbl_pending = intel_fb->vbl_seq;
	       }
	    }
	 }
      }

      if ((intel->driDrawable != driDrawPriv) ||
	  (intel->lastStamp != driDrawPriv->lastStamp)) {
	    intel->driDrawable = driDrawPriv;
	    intelWindowMoved(intel);
	    intel->lastStamp = driDrawPriv->lastStamp;
      }

   }
   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;
   intelScreenPrivate *intelScreen = (intelScreenPrivate *) sPriv->private;
   drmI830Sarea *sarea = intel->sarea;

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

   if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - got contended lock\n", __progname);

   /* 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);

   if (sarea->width != intelScreen->front.width ||
       sarea->height != intelScreen->front.height) {

      intelUpdateScreenRotation(sPriv, sarea);
   }

#if 0
   if (sarea->width != intel->width ||
       sarea->height != intel->height ||
       sarea->rotation != intel->current_rotation) {
      int numClipRects = intel->numClipRects;

      /*
       * FIXME: Really only need to do this when drawing to a
       * common back- or front buffer.
       */

      /*
       * This will essentially drop the outstanding batchbuffer on the floor.
       */
      intel->numClipRects = 0;

      INTEL_FIREVERTICES(intel);

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

      intel->numClipRects = numClipRects;

      /* force window update */
      intel->lastStamp = 0;

      intel->width = sarea->width;
      intel->height = sarea->height;
      intel->current_rotation = sarea->rotation;
   }
#endif
}


/* Lock the hardware and validate our state.
 */
void LOCK_HARDWARE( struct intel_context *intel )
{
    char __ret=0;
    struct intel_framebuffer *intel_fb = NULL;
    struct intel_renderbuffer *intel_rb = NULL;
    _glthread_LOCK_MUTEX(lockMutex);
    assert(!intel->locked);

    if (intel->driDrawable) {
       intel_fb = intel->driDrawable->driverPrivate;

       if (intel_fb)
	  intel_rb =
	     intel_get_renderbuffer(&intel_fb->Base,
				    intel_fb->Base._ColorDrawBufferMask[0] ==
				    BUFFER_BIT_FRONT_LEFT ? BUFFER_FRONT_LEFT :
				    BUFFER_BACK_LEFT);
    }

    if (intel_rb && intel_fb->vblank_flags &&
	!(intel_fb->vblank_flags & VBLANK_FLAG_NO_IRQ) &&
	(intel_fb->vbl_waited - intel_rb->vbl_pending) > (1<<23)) {
	drmVBlank vbl;

	vbl.request.type = DRM_VBLANK_ABSOLUTE;

	if ( intel_fb->vblank_flags & VBLANK_FLAG_SECONDARY ) {
	    vbl.request.type |= DRM_VBLANK_SECONDARY;
	}

	vbl.request.sequence = intel_rb->vbl_pending;
	drmWaitVBlank(intel->driFd, &vbl);
	intel_fb->vbl_waited = vbl.reply.sequence;
    }

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

    if (__ret)
        intelContendedLock( intel, 0 );

    if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - locked\n", __progname);

    intel->locked = 1;
}


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

   DRM_UNLOCK(intel->driFd, intel->driHwLock, intel->hHWContext);

   _glthread_UNLOCK_MUTEX(lockMutex);

   if (INTEL_DEBUG & DEBUG_LOCK)
      _mesa_printf("%s - unlocked\n", __progname);
}