summaryrefslogtreecommitdiffstats
path: root/src/mesa/drivers/dri/fb/fb_egl.c
blob: 813afec03525c9da5041c2dbb9c6bafde3afeeba (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
/*
 * Test egl driver for fb_dri.so
 */
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h> 
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/fb.h>

#include "utils.h"
#include "buffers.h"
#include "extensions.h"
#include "framebuffer.h"
#include "renderbuffer.h"
#include "array_cache/acache.h"
#include "swrast/swrast.h"
#include "swrast_setup/swrast_setup.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
#include "tnl/t_pipeline.h"
#include "drivers/common/driverfuncs.h"
#include "drirenderbuffer.h"

#include "eglconfig.h"
#include "eglcontext.h"
#include "egldisplay.h"
#include "egldriver.h"
#include "eglglobals.h"
#include "eglmode.h"
#include "eglscreen.h"
#include "eglsurface.h"

extern void
fbSetSpanFunctions(driRenderbuffer *drb, const GLvisual *vis);

/**
 * fb driver-specific driver class derived from _EGLDriver
 */
typedef struct fb_driver
{
   _EGLDriver Base;  /* base class/object */
   GLuint fbStuff;
} fbDriver;

/**
 * fb display-specific driver class derived from _EGLDisplay
 */
typedef struct fb_display
{
   _EGLDisplay Base;  /* base class/object */
   void *pFB;
} fbDisplay;

/**
 * fb driver-specific screen class derived from _EGLScreen
 */
typedef struct fb_screen
{
   _EGLScreen Base;
   char fb[NAME_MAX];
} fbScreen;


/**
 * fb driver-specific surface class derived from _EGLSurface
 */
typedef struct fb_surface
{
   _EGLSurface Base;  /* base class/object */
   struct gl_framebuffer *mesa_framebuffer;
} fbSurface;


/**
 * fb driver-specific context class derived from _EGLContext
 */
typedef struct fb_context
{
   _EGLContext Base;  /* base class/object */
   GLcontext *glCtx;
} fbContext;


static EGLBoolean
fbFillInConfigs(_EGLDisplay *disp, unsigned pixel_bits, unsigned depth_bits,
               unsigned stencil_bits, GLboolean have_back_buffer) {
   _EGLConfig *configs;
   _EGLConfig *c;
   unsigned int i, num_configs;
   unsigned int depth_buffer_factor;
   unsigned int back_buffer_factor;
   GLenum fb_format;
   GLenum fb_type;

   /* Right now GLX_SWAP_COPY_OML isn't supported, but it would be easy
   * enough to add support.  Basically, if a context is created with an
   * fbconfig where the swap method is GLX_SWAP_COPY_OML, pageflipping
   * will never be used.
   */
   static const GLenum back_buffer_modes[] = {
            GLX_NONE, GLX_SWAP_UNDEFINED_OML /*, GLX_SWAP_COPY_OML */
         };

   u_int8_t depth_bits_array[2];
   u_int8_t stencil_bits_array[2];

   depth_bits_array[0] = 0;
   depth_bits_array[1] = 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] = (stencil_bits == 0) ? 8 : stencil_bits;

   depth_buffer_factor = ((depth_bits != 0) || (stencil_bits != 0)) ? 2 : 1;
   back_buffer_factor = (have_back_buffer) ? 2 : 1;

   num_configs = depth_buffer_factor * back_buffer_factor * 2;

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

   configs = calloc(sizeof(*configs), num_configs);
   c = configs;
   if (!_eglFillInConfigs(c, fb_format, fb_type,
                          depth_bits_array, stencil_bits_array, depth_buffer_factor,
                          back_buffer_modes, back_buffer_factor,
                          GLX_TRUE_COLOR)) {
      fprintf(stderr, "[%s:%u] Error creating FBConfig!\n",
               __func__, __LINE__);
      return EGL_FALSE;
   }

   /* Mark the visual as slow if there are "fake" stencil bits.
   */
   for (i = 0, c = configs; i < num_configs; i++, c++) {
      int stencil = GET_CONFIG_ATTRIB(c, EGL_STENCIL_SIZE);
      if ((stencil != 0)  && (stencil != stencil_bits)) {
         SET_CONFIG_ATTRIB(c, EGL_CONFIG_CAVEAT, EGL_SLOW_CONFIG);
      }
   }

   for (i = 0, c = configs; i < num_configs; i++, c++)
      _eglAddConfig(disp, c);
      
   free(configs);
   
   return EGL_TRUE;
}

static EGLBoolean
fbSetupFramebuffer(fbDisplay *disp, char *fbdev) 
{
   int fd;
   char dev[20];
   struct fb_var_screeninfo varInfo;
   struct fb_fix_screeninfo fixedInfo;
   
   snprintf(dev, sizeof(dev), "/dev/%s", fbdev);

   /* open the framebuffer device */
   fd = open(dev, O_RDWR);
   if (fd < 0) {
      fprintf(stderr, "Error opening %s: %s\n", fbdev, strerror(errno));
      return EGL_FALSE;
   }

   /* get the original variable screen info */
   if (ioctl(fd, FBIOGET_VSCREENINFO, &varInfo)) {
      fprintf(stderr, "error: ioctl(FBIOGET_VSCREENINFO) failed: %s\n",
               strerror(errno));
      return EGL_FALSE;
   }

   /* Turn off hw accels (otherwise mmap of mmio region will be
    * refused)
    */
   if (varInfo.accel_flags) {
      varInfo.accel_flags = 0;
      if (ioctl(fd, FBIOPUT_VSCREENINFO, &varInfo)) {
         fprintf(stderr, "error: ioctl(FBIOPUT_VSCREENINFO) failed: %s\n",
                  strerror(errno));
         return EGL_FALSE;
      }
   }

   /* Get the fixed screen info */
   if (ioctl(fd, FBIOGET_FSCREENINFO, &fixedInfo)) {
      fprintf(stderr, "error: ioctl(FBIOGET_FSCREENINFO) failed: %s\n",
               strerror(errno));
      return EGL_FALSE;
   }

   /* mmap the framebuffer into our address space */
   disp->pFB = (caddr_t)mmap(0,  /* start */
                      fixedInfo.smem_len,  /* bytes */
                      PROT_READ | PROT_WRITE,  /* prot */
                      MAP_SHARED,  /* flags */
                      fd,  /* fd */
                      0); /* offset */ 
   if (disp->pFB == (caddr_t)-1) {
      fprintf(stderr, "error: unable to mmap framebuffer: %s\n",
               strerror(errno));
      return EGL_FALSE;
   }
   
   return EGL_TRUE;
}
   
const char *sysfs = "/sys/class/graphics";

static EGLBoolean
fbInitialize(_EGLDriver *drv, EGLDisplay dpy, EGLint *major, EGLint *minor)
{
   _EGLDisplay *disp = _eglLookupDisplay(dpy);
   fbDisplay *display;
   fbScreen *s;
   _EGLScreen *scrn;
   char c;
   unsigned int x, y, r;
   DIR *dir;
   FILE *file;
   struct dirent *dirent;
   char path[NAME_MAX];
   
   /* Switch display structure to one with our private fields */
   display = calloc(1, sizeof(*display));
   display->Base = *disp;
   _eglHashInsert(_eglGlobal.Displays, disp->Handle, display);
   free(disp);
   
   *major = 1;
   *minor = 0;
   
   dir = opendir(sysfs);
   if (!dir) {
      printf("EGL - %s framebuffer device not found.", sysfs);
      return EGL_FALSE;
   }
   
   while ((dirent = readdir(dir))) {  /* assignment! */
      
      if (dirent->d_name[0] != 'f')
         continue;
      if (dirent->d_name[1] != 'b')
         continue;
   
      if (fbSetupFramebuffer(display, dirent->d_name) == EGL_FALSE)
         continue;
         
      /* Create a screen */
      s = (fbScreen *) calloc(1, sizeof(fbScreen));
      if (!s)
         return EGL_FALSE;

      strncpy(s->fb, dirent->d_name, NAME_MAX);
      scrn = &s->Base;
      _eglInitScreen(scrn);
      _eglAddScreen(&display->Base, scrn);
      
      snprintf(path, sizeof(path), "%s/%s/modes", sysfs, s->fb);
      file = fopen(path, "r");
      while (fgets(path, sizeof(path), file)) {
         sscanf(path, "%c:%ux%u-%u", &c, &x, &y, &r);
         _eglAddMode(scrn, x, y, r * 1000, path);
      }
      fclose(file);

      fbFillInConfigs(&display->Base, 32, 24, 8, 1);
      
   }
   closedir(dir);

   drv->Initialized = EGL_TRUE;
   return EGL_TRUE;
}


static fbDisplay *
Lookup_fbDisplay(EGLDisplay dpy)
{
   _EGLDisplay *d = _eglLookupDisplay(dpy);
   return (fbDisplay *) d;
}


static fbScreen *
Lookup_fbScreen(EGLDisplay dpy, EGLScreenMESA screen)
{
   _EGLScreen *s = _eglLookupScreen(dpy, screen);
   return (fbScreen *) s;
}


static fbContext *
Lookup_fbContext(EGLContext ctx)
{
   _EGLContext *c = _eglLookupContext(ctx);
   return (fbContext *) c;
}


static fbSurface *
Lookup_fbSurface(EGLSurface surf)
{
   _EGLSurface *s = _eglLookupSurface(surf);
   return (fbSurface *) s;
}


static EGLBoolean
fbTerminate(_EGLDriver *drv, EGLDisplay dpy)
{
   fbDisplay *display = Lookup_fbDisplay(dpy);
   _eglCleanupDisplay(&display->Base);
   free(display);
   free(drv);
   return EGL_TRUE;
}


static const GLubyte *
get_string(GLcontext *ctx, GLenum pname)
{
   (void) ctx;
   switch (pname) {
      case GL_RENDERER:
         return (const GLubyte *) "Mesa dumb framebuffer";
      default:
         return NULL;
   }
}


static void
update_state( GLcontext *ctx, GLuint new_state )
{
   /* not much to do here - pass it on */
   _swrast_InvalidateState( ctx, new_state );
   _swsetup_InvalidateState( ctx, new_state );
   _ac_InvalidateState( ctx, new_state );
   _tnl_InvalidateState( ctx, new_state );
}


/**
 * Called by ctx->Driver.GetBufferSize from in core Mesa to query the
 * current framebuffer size.
 */
static void
get_buffer_size( GLframebuffer *buffer, GLuint *width, GLuint *height )
{
   *width  = buffer->Width;
   *height = buffer->Height;
}


static void
viewport(GLcontext *ctx, GLint x, GLint y, GLsizei w, GLsizei h)
{
   _mesa_ResizeBuffersMESA();
}


static void
init_core_functions( struct dd_function_table *functions )
{
   functions->GetString = get_string;
   functions->UpdateState = update_state;
   functions->ResizeBuffers = _mesa_resize_framebuffer;
   functions->GetBufferSize = get_buffer_size;
   functions->Viewport = viewport;

   functions->Clear = _swrast_Clear;  /* could accelerate with blits */
}


static EGLContext
fbCreateContext(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, EGLContext share_list, const EGLint *attrib_list)
{
   GLcontext *ctx;
   _EGLConfig *conf;
   fbContext *c;
   _EGLDisplay *disp = _eglLookupDisplay(dpy);
   struct dd_function_table functions;
   GLvisual vis;
   int i;

   conf = _eglLookupConfig(drv, dpy, config);
   if (!conf) {
      _eglError(EGL_BAD_CONFIG, "eglCreateContext");
      return EGL_NO_CONTEXT;
   }

   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs defined for now */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreateContext");
         return EGL_NO_CONTEXT;
      }
   }

   c = (fbContext *) calloc(1, sizeof(fbContext));
   if (!c)
      return EGL_NO_CONTEXT;

   _eglInitContext(&c->Base);
   c->Base.Display = disp;
   c->Base.Config = conf;
   c->Base.DrawSurface = EGL_NO_SURFACE;
   c->Base.ReadSurface = EGL_NO_SURFACE;
   printf("fbCreateContext\n");

   /* generate handle and insert into hash table */
   _eglSaveContext(&c->Base);
   assert(c->Base.Handle);

   /* Init default driver functions then plug in our FBdev-specific functions
    */
   _mesa_init_driver_functions(&functions);
   init_core_functions(&functions);

   _eglConfigToContextModesRec(conf, &vis);

   ctx = c->glCtx = _mesa_create_context(&vis, NULL, &functions, (void *)c);
   if (!c->glCtx) {
      _mesa_free(c);
      return GL_FALSE;
   }

   /* Create module contexts */
   _swrast_CreateContext( ctx );
   _ac_CreateContext( ctx );
   _tnl_CreateContext( ctx );
   _swsetup_CreateContext( ctx );
   _swsetup_Wakeup( ctx );


   /* swrast init -- need to verify these tests - I just plucked the
    * numbers out of the air.  (KW)
    */
   {
      struct swrast_device_driver *swdd;
      swdd = _swrast_GetDeviceDriverReference( ctx );
   }

   /* use default TCL pipeline */
   {
      TNLcontext *tnl = TNL_CONTEXT(ctx);
      tnl->Driver.RunPipeline = _tnl_run_pipeline;
   }

   _mesa_enable_sw_extensions(ctx);

   return c->Base.Handle;
}


static EGLSurface
fbCreateWindowSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, NativeWindowType window, const EGLint *attrib_list)
{
   int i;
   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs at this time */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreateWindowSurface");
         return EGL_NO_SURFACE;
      }
   }
   printf("eglCreateWindowSurface()\n");
   /* XXX unfinished */

   return EGL_NO_SURFACE;
}


static EGLSurface
fbCreatePixmapSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, NativePixmapType pixmap, const EGLint *attrib_list)
{
   _EGLConfig *conf;
   EGLint i;

   conf = _eglLookupConfig(drv, dpy, config);
   if (!conf) {
      _eglError(EGL_BAD_CONFIG, "eglCreatePixmapSurface");
      return EGL_NO_SURFACE;
   }

   for (i = 0; attrib_list && attrib_list[i] != EGL_NONE; i++) {
      switch (attrib_list[i]) {
         /* no attribs at this time */
      default:
         _eglError(EGL_BAD_ATTRIBUTE, "eglCreatePixmapSurface");
         return EGL_NO_SURFACE;
      }
   }

   if (conf->Attrib[EGL_SURFACE_TYPE - FIRST_ATTRIB] == 0) {
      _eglError(EGL_BAD_MATCH, "eglCreatePixmapSurface");
      return EGL_NO_SURFACE;
   }

   printf("eglCreatePixmapSurface()\n");
   return EGL_NO_SURFACE;
}


static EGLSurface
fbCreatePbufferSurface(_EGLDriver *drv, EGLDisplay dpy, EGLConfig config, const EGLint *attrib_list)
{
   fbSurface *surf;

   surf = (fbSurface *) calloc(1, sizeof(fbSurface));
   if (!surf) {
      return EGL_NO_SURFACE;
   }

   if (_eglInitPbufferSurface(&surf->Base, drv, dpy, config, attrib_list)) {
      free(surf);
      return EGL_NO_SURFACE;
   }

   /* create software-based pbuffer */
   {
      GLcontext *ctx = NULL; /* this _should_ be OK */
      GLvisual vis;
      _EGLConfig *conf = _eglLookupConfig(drv, dpy, config);
      assert(conf); /* bad config should be caught earlier */
      _eglConfigToContextModesRec(conf, &vis);

      surf->mesa_framebuffer = _mesa_create_framebuffer(&vis);
      _mesa_add_soft_renderbuffers(surf->mesa_framebuffer,
                                   GL_TRUE, /* color bufs */
                                   vis.haveDepthBuffer,
                                   vis.haveStencilBuffer,
                                   vis.haveAccumBuffer,
                                   GL_FALSE, /* alpha */
                                   GL_FALSE /* aux */ );

      /* set pbuffer/framebuffer size */
      _mesa_resize_framebuffer(ctx, surf->mesa_framebuffer,
                               surf->Base.Width, surf->Base.Height);
   }

   return surf->Base.Handle;
}


static EGLBoolean
fbDestroySurface(_EGLDriver *drv, EGLDisplay dpy, EGLSurface surface)
{
   fbSurface *fs = Lookup_fbSurface(surface);
   _eglRemoveSurface(&fs->Base);
   if (fs->Base.IsBound) {
      fs->Base.DeletePending = EGL_TRUE;
   }
   else {
      free(fs);
   }
   return EGL_TRUE;
}


static EGLBoolean
fbDestroyContext(_EGLDriver *drv, EGLDisplay dpy, EGLContext context)
{
   fbContext *fc = Lookup_fbContext(context);
   _eglRemoveContext(&fc->Base);
   if (fc->Base.IsBound) {
      fc->Base.DeletePending = EGL_TRUE;
   }
   else {
      free(fc);
   }
   return EGL_TRUE;
}


static EGLBoolean
fbMakeCurrent(_EGLDriver *drv, EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext context)
{
   fbSurface *readSurf = Lookup_fbSurface(read);
   fbSurface *drawSurf = Lookup_fbSurface(draw);
   fbContext *ctx = Lookup_fbContext(context);
   EGLBoolean b;

   b = _eglMakeCurrent(drv, dpy, draw, read, context);
   if (!b)
      return EGL_FALSE;

   if (ctx) {
      _mesa_make_current( ctx->glCtx, 
                           drawSurf->mesa_framebuffer,
                           readSurf->mesa_framebuffer);
   } else
      _mesa_make_current( NULL, NULL, NULL );

   printf("eglMakeCurrent()\n");
   return EGL_TRUE;
}


/**
 * Create a drawing surface which can be directly displayed on a screen.
 */
static EGLSurface
fbCreateScreenSurfaceMESA(_EGLDriver *drv, EGLDisplay dpy, EGLConfig cfg,
                          const EGLint *attrib_list)
{
   _EGLConfig *config = _eglLookupConfig(drv, dpy, cfg);
   fbDisplay *display = Lookup_fbDisplay(dpy);
   fbSurface *surface;
   EGLSurface surf;
   GLvisual vis;
   GLcontext *ctx = NULL; /* this should be OK */
   int origin, bytesPerPixel;
   int width, height, stride;
   
   surface = (fbSurface *) malloc(sizeof(*surface));
   if (!surface) {
      return EGL_NO_SURFACE;
   }

   /* init base class, error check, etc. */
   surf = _eglInitScreenSurface(&surface->Base, drv, dpy, cfg, attrib_list);
   if (surf == EGL_NO_SURFACE) {
      free(surface);
      return EGL_NO_SURFACE;
   }

   /* convert EGLConfig to GLvisual */
   _eglConfigToContextModesRec(config, &vis);

   /* create Mesa framebuffer */
   surface->mesa_framebuffer = _mesa_create_framebuffer(&vis);
   if (!surface->mesa_framebuffer) {
      free(surface);
      _eglRemoveSurface(&surface->Base);
      return EGL_NO_SURFACE;
   }

   width = surface->Base.Width;
   stride = width * bytesPerPixel;
   height = surface->Base.Height;
   bytesPerPixel = vis.rgbBits / 8;
   origin = 0;

   /* front color renderbuffer */
   {
      driRenderbuffer *drb = driNewRenderbuffer(GL_RGBA, bytesPerPixel,
                                                origin, stride);
      fbSetSpanFunctions(drb, &vis);
      drb->Base.Data = display->pFB;
      _mesa_add_renderbuffer(surface->mesa_framebuffer,
                             BUFFER_FRONT_LEFT, &drb->Base);
   }

   /* back color renderbuffer */
   if (vis.doubleBufferMode) {
      driRenderbuffer *drb = driNewRenderbuffer(GL_RGBA, bytesPerPixel,
                                                origin, stride);
      fbSetSpanFunctions(drb, &vis);
      drb->Base.Data =  _mesa_malloc(stride * height);
      _mesa_add_renderbuffer(surface->mesa_framebuffer,
                             BUFFER_BACK_LEFT, &drb->Base);
   }

   /* other renderbuffers- software based */
   _mesa_add_soft_renderbuffers(surface->mesa_framebuffer,
                                GL_FALSE, /* color */
                                vis.haveDepthBuffer,
                                vis.haveStencilBuffer,
                                vis.haveAccumBuffer,
                                GL_FALSE, /* alpha */
                                GL_FALSE /* aux */);
   
   _mesa_resize_framebuffer(ctx, surface->mesa_framebuffer, width, height);

   return surf;
}


/**
 * Show the given surface on the named screen.
 * If surface is EGL_NO_SURFACE, disable the screen's output.
 */
static EGLBoolean
fbShowSurfaceMESA(_EGLDriver *drv, EGLDisplay dpy, EGLScreenMESA screen,
                    EGLSurface surface, EGLModeMESA m)
{
   FILE *file;
   char buffer[NAME_MAX];
   fbScreen *scrn = Lookup_fbScreen(dpy, screen);
   fbSurface *surf = Lookup_fbSurface(surface);
   _EGLMode *mode = _eglLookupMode(dpy, m);
   int bits;
   
   if (!_eglShowSurfaceMESA(drv, dpy, screen, surface, m))
      return EGL_FALSE;
      
   snprintf(buffer, sizeof(buffer), "%s/%s/blank", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file) {
err:
      printf("chown all fb sysfs attrib to allow write - %s\n", buffer);
      return EGL_FALSE;
   }
   snprintf(buffer, sizeof(buffer), "%d", (m == EGL_NO_MODE_MESA ? VESA_POWERDOWN : VESA_HSYNC_SUSPEND));
   fputs(buffer, file);
   fclose(file);
   
   if (m == EGL_NO_MODE_MESA)
      return EGL_TRUE;
   
   snprintf(buffer, sizeof(buffer), "%s/%s/mode", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file)
      goto err;
   fputs(mode->Name, file);
   fclose(file);
   
   snprintf(buffer, sizeof(buffer), "%s/%s/bits_per_pixel", sysfs, scrn->fb);
   
   file = fopen(buffer, "r+");
   if (!file)
      goto err;
   bits = GET_CONFIG_ATTRIB(surf->Base.Config, EGL_BUFFER_SIZE);
   snprintf(buffer, sizeof(buffer), "%d", bits);
   fputs(buffer, file);
   fclose(file);

   file = fopen(buffer, "r+");
   if (!file)
      goto err;
      
   snprintf(buffer, sizeof(buffer), "%d", VESA_NO_BLANKING);
   fputs(buffer, file);
   fclose(file);
   
   return EGL_TRUE;
}


/*
 * Just to silence warning
 */
extern _EGLDriver *
_eglMain(NativeDisplayType dpy);


/**
 * The bootstrap function.  Return a new fbDriver object and
 * plug in API functions.
 */
_EGLDriver *
_eglMain(NativeDisplayType dpy)
{
   fbDriver *fb;

   fb = (fbDriver *) calloc(1, sizeof(fbDriver));
   if (!fb) {
      return NULL;
   }

   /* First fill in the dispatch table with defaults */
   _eglInitDriverFallbacks(&fb->Base);
   
   /* then plug in our fb-specific functions */
   fb->Base.Initialize = fbInitialize;
   fb->Base.Terminate = fbTerminate;
   fb->Base.CreateContext = fbCreateContext;
   fb->Base.MakeCurrent = fbMakeCurrent;
   fb->Base.CreateWindowSurface = fbCreateWindowSurface;
   fb->Base.CreatePixmapSurface = fbCreatePixmapSurface;
   fb->Base.CreatePbufferSurface = fbCreatePbufferSurface;
   fb->Base.DestroySurface = fbDestroySurface;
   fb->Base.DestroyContext = fbDestroyContext;
   fb->Base.CreateScreenSurfaceMESA = fbCreateScreenSurfaceMESA;
   fb->Base.ShowSurfaceMESA = fbShowSurfaceMESA;
   
   /* enable supported extensions */
   fb->Base.MESA_screen_surface = EGL_TRUE;
   fb->Base.MESA_copy_context = EGL_TRUE;

   return &fb->Base;
}