summaryrefslogtreecommitdiff
path: root/src/mesa/main/debug.c
blob: 533c5ed6ced145dca4b5f7b62f544580fd7e94e2 (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
/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
 * Copyright (C) 2009  VMware, Inc.  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, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL 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 "mtypes.h"
#include "attrib.h"
#include "colormac.h"
#include "enums.h"
#include "formats.h"
#include "hash.h"
#include "imports.h"
#include "debug.h"
#include "get.h"
#include "pixelstore.h"
#include "readpix.h"
#include "texobj.h"


static const char *
tex_target_name(GLenum tgt)
{
   static const struct {
      GLenum target;
      const char *name;
   } tex_targets[] = {
      { GL_TEXTURE_1D, "GL_TEXTURE_1D" },
      { GL_TEXTURE_2D, "GL_TEXTURE_2D" },
      { GL_TEXTURE_3D, "GL_TEXTURE_3D" },
      { GL_TEXTURE_CUBE_MAP, "GL_TEXTURE_CUBE_MAP" },
      { GL_TEXTURE_RECTANGLE, "GL_TEXTURE_RECTANGLE" },
      { GL_TEXTURE_1D_ARRAY_EXT, "GL_TEXTURE_1D_ARRAY" },
      { GL_TEXTURE_2D_ARRAY_EXT, "GL_TEXTURE_2D_ARRAY" },
      { GL_TEXTURE_EXTERNAL_OES, "GL_TEXTURE_EXTERNAL_OES" }
   };
   GLuint i;
   for (i = 0; i < Elements(tex_targets); i++) {
      if (tex_targets[i].target == tgt)
         return tex_targets[i].name;
   }
   return "UNKNOWN TEX TARGET";
}


void
_mesa_print_state( const char *msg, GLuint state )
{
   _mesa_debug(NULL,
	   "%s: (0x%x) %s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s\n",
	   msg,
	   state,
	   (state & _NEW_MODELVIEW)       ? "ctx->ModelView, " : "",
	   (state & _NEW_PROJECTION)      ? "ctx->Projection, " : "",
	   (state & _NEW_TEXTURE_MATRIX)  ? "ctx->TextureMatrix, " : "",
	   (state & _NEW_COLOR)           ? "ctx->Color, " : "",
	   (state & _NEW_DEPTH)           ? "ctx->Depth, " : "",
	   (state & _NEW_EVAL)            ? "ctx->Eval/EvalMap, " : "",
	   (state & _NEW_FOG)             ? "ctx->Fog, " : "",
	   (state & _NEW_HINT)            ? "ctx->Hint, " : "",
	   (state & _NEW_LIGHT)           ? "ctx->Light, " : "",
	   (state & _NEW_LINE)            ? "ctx->Line, " : "",
	   (state & _NEW_PIXEL)           ? "ctx->Pixel, " : "",
	   (state & _NEW_POINT)           ? "ctx->Point, " : "",
	   (state & _NEW_POLYGON)         ? "ctx->Polygon, " : "",
	   (state & _NEW_POLYGONSTIPPLE)  ? "ctx->PolygonStipple, " : "",
	   (state & _NEW_SCISSOR)         ? "ctx->Scissor, " : "",
	   (state & _NEW_STENCIL)         ? "ctx->Stencil, " : "",
	   (state & _NEW_TEXTURE)         ? "ctx->Texture, " : "",
	   (state & _NEW_TRANSFORM)       ? "ctx->Transform, " : "",
	   (state & _NEW_VIEWPORT)        ? "ctx->Viewport, " : "",
	   (state & _NEW_PACKUNPACK)      ? "ctx->Pack/Unpack, " : "",
	   (state & _NEW_ARRAY)           ? "ctx->Array, " : "",
	   (state & _NEW_RENDERMODE)      ? "ctx->RenderMode, " : "",
	   (state & _NEW_BUFFERS)         ? "ctx->Visual, ctx->DrawBuffer,, " : "");
}



void
_mesa_print_tri_caps( const char *name, GLuint flags )
{
   _mesa_debug(NULL,
	   "%s: (0x%x) %s%s%s%s%s%s%s\n",
	   name,
	   flags,
	   (flags & DD_TRI_LIGHT_TWOSIDE)   ? "tri-light-twoside, " : "",
	   (flags & DD_TRI_UNFILLED)        ? "tri-unfilled, " : "",
	   (flags & DD_TRI_STIPPLE)         ? "tri-stipple, " : "",
	   (flags & DD_TRI_OFFSET)          ? "tri-offset, " : "",
	   (flags & DD_TRI_SMOOTH)          ? "tri-smooth, " : "",
	   (flags & DD_POINT_SMOOTH)        ? "point-smooth, " : "",
	   (flags & DD_POINT_ATTEN)         ? "point-atten, " : ""
      );
}


/**
 * Print information about this Mesa version and build options.
 */
void _mesa_print_info( void )
{
   _mesa_debug(NULL, "Mesa GL_VERSION = %s\n",
	   (char *) _mesa_GetString(GL_VERSION));
   _mesa_debug(NULL, "Mesa GL_RENDERER = %s\n",
	   (char *) _mesa_GetString(GL_RENDERER));
   _mesa_debug(NULL, "Mesa GL_VENDOR = %s\n",
	   (char *) _mesa_GetString(GL_VENDOR));
   _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n",
	   (char *) _mesa_GetString(GL_EXTENSIONS));
#if defined(THREADS)
   _mesa_debug(NULL, "Mesa thread-safe: YES\n");
#else
   _mesa_debug(NULL, "Mesa thread-safe: NO\n");
#endif
#if defined(USE_X86_ASM)
   _mesa_debug(NULL, "Mesa x86-optimized: YES\n");
#else
   _mesa_debug(NULL, "Mesa x86-optimized: NO\n");
#endif
#if defined(USE_SPARC_ASM)
   _mesa_debug(NULL, "Mesa sparc-optimized: YES\n");
#else
   _mesa_debug(NULL, "Mesa sparc-optimized: NO\n");
#endif
}


/**
 * Set verbose logging flags.  When these flags are set, GL API calls
 * in the various categories will be printed to stderr.
 * \param str  a comma-separated list of keywords
 */
static void
set_verbose_flags(const char *str)
{
#ifdef DEBUG
   struct option {
      const char *name;
      GLbitfield flag;
   };
   static const struct option opts[] = {
      { "varray",    VERBOSE_VARRAY },
      { "tex",       VERBOSE_TEXTURE },
      { "mat",       VERBOSE_MATERIAL },
      { "pipe",      VERBOSE_PIPELINE },
      { "driver",    VERBOSE_DRIVER },
      { "state",     VERBOSE_STATE },
      { "api",       VERBOSE_API },
      { "list",      VERBOSE_DISPLAY_LIST },
      { "lighting",  VERBOSE_LIGHTING },
      { "disassem",  VERBOSE_DISASSEM },
      { "draw",      VERBOSE_DRAW },
      { "swap",      VERBOSE_SWAPBUFFERS }
   };
   GLuint i;

   if (!str)
      return;

   MESA_VERBOSE = 0x0;
   for (i = 0; i < Elements(opts); i++) {
      if (strstr(str, opts[i].name) || strcmp(str, "all") == 0)
         MESA_VERBOSE |= opts[i].flag;
   }
#endif
}


/**
 * Set debugging flags.  When these flags are set, Mesa will do additional
 * debug checks or actions.
 * \param str  a comma-separated list of keywords
 */
static void
set_debug_flags(const char *str)
{
#ifdef DEBUG
   struct option {
      const char *name;
      GLbitfield flag;
   };
   static const struct option opts[] = {
      { "silent", DEBUG_SILENT }, /* turn off debug messages */
      { "flush", DEBUG_ALWAYS_FLUSH }, /* flush after each drawing command */
      { "incomplete_tex", DEBUG_INCOMPLETE_TEXTURE },
      { "incomplete_fbo", DEBUG_INCOMPLETE_FBO }
   };
   GLuint i;

   if (!str)
      return;

   MESA_DEBUG_FLAGS = 0x0;
   for (i = 0; i < Elements(opts); i++) {
      if (strstr(str, opts[i].name))
         MESA_DEBUG_FLAGS |= opts[i].flag;
   }
#endif
}


/**
 * Initialize debugging variables from env vars.
 */
void 
_mesa_init_debug( struct gl_context *ctx )
{
   set_debug_flags(_mesa_getenv("MESA_DEBUG"));
   set_verbose_flags(_mesa_getenv("MESA_VERBOSE"));
}


/*
 * Write ppm file
 */
static void
write_ppm(const char *filename, const GLubyte *buffer, int width, int height,
          int comps, int rcomp, int gcomp, int bcomp, GLboolean invert)
{
   FILE *f = fopen( filename, "w" );
   if (f) {
      int x, y;
      const GLubyte *ptr = buffer;
      fprintf(f,"P6\n");
      fprintf(f,"# ppm-file created by osdemo.c\n");
      fprintf(f,"%i %i\n", width,height);
      fprintf(f,"255\n");
      fclose(f);
      f = fopen( filename, "ab" );  /* reopen in binary append mode */
      for (y=0; y < height; y++) {
         for (x = 0; x < width; x++) {
            int yy = invert ? (height - 1 - y) : y;
            int i = (yy * width + x) * comps;
            fputc(ptr[i+rcomp], f); /* write red */
            fputc(ptr[i+gcomp], f); /* write green */
            fputc(ptr[i+bcomp], f); /* write blue */
         }
      }
      fclose(f);
   }
   else {
      fprintf(stderr, "Unable to create %s in write_ppm()\n", filename);
   }
}


/**
 * Write a texture image to a ppm file.
 * \param face  cube face in [0,5]
 * \param level  mipmap level
 */
static void
write_texture_image(struct gl_texture_object *texObj,
                    GLuint face, GLuint level)
{
   struct gl_texture_image *img = texObj->Image[face][level];
   if (img) {
      GET_CURRENT_CONTEXT(ctx);
      struct gl_pixelstore_attrib store;
      GLubyte *buffer;
      char s[100];

      buffer = malloc(img->Width * img->Height
                                        * img->Depth * 4);

      store = ctx->Pack; /* save */
      ctx->Pack = ctx->DefaultPacking;

      ctx->Driver.GetTexImage(ctx, GL_RGBA, GL_UNSIGNED_BYTE, buffer, img);

      /* make filename */
      _mesa_snprintf(s, sizeof(s), "/tmp/tex%u.l%u.f%u.ppm", texObj->Name, level, face);

      printf("  Writing image level %u to %s\n", level, s);
      write_ppm(s, buffer, img->Width, img->Height, 4, 0, 1, 2, GL_FALSE);

      ctx->Pack = store; /* restore */

      free(buffer);
   }
}


/**
 * Write renderbuffer image to a ppm file.
 */
void
_mesa_write_renderbuffer_image(const struct gl_renderbuffer *rb)
{
   GET_CURRENT_CONTEXT(ctx);
   GLubyte *buffer;
   char s[100];
   GLenum format, type;

   if (rb->_BaseFormat == GL_RGB || 
       rb->_BaseFormat == GL_RGBA) {
      format = GL_RGBA;
      type = GL_UNSIGNED_BYTE;
   }
   else if (rb->_BaseFormat == GL_DEPTH_STENCIL) {
      format = GL_DEPTH_STENCIL;
      type = GL_UNSIGNED_INT_24_8;
   }
   else {
      _mesa_debug(NULL,
                  "Unsupported BaseFormat 0x%x in "
                  "_mesa_write_renderbuffer_image()\n",
                  rb->_BaseFormat);
      return;
   }

   buffer = malloc(rb->Width * rb->Height * 4);

   ctx->Driver.ReadPixels(ctx, 0, 0, rb->Width, rb->Height,
                          format, type, &ctx->DefaultPacking, buffer);

   /* make filename */
   _mesa_snprintf(s, sizeof(s), "/tmp/renderbuffer%u.ppm", rb->Name);
   _mesa_snprintf(s, sizeof(s), "C:\\renderbuffer%u.ppm", rb->Name);

   printf("  Writing renderbuffer image to %s\n", s);

   _mesa_debug(NULL, "  Writing renderbuffer image to %s\n", s);

   write_ppm(s, buffer, rb->Width, rb->Height, 4, 0, 1, 2, GL_TRUE);

   free(buffer);
}


/** How many texture images (mipmap levels, faces) to write to files */
#define WRITE_NONE 0
#define WRITE_ONE  1
#define WRITE_ALL  2

static GLuint WriteImages;


static void
dump_texture(struct gl_texture_object *texObj, GLuint writeImages)
{
   const GLuint numFaces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
   GLboolean written = GL_FALSE;
   GLuint i, j;

   printf("Texture %u\n", texObj->Name);
   printf("  Target %s\n", tex_target_name(texObj->Target));
   for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
      for (j = 0; j < numFaces; j++) {
         struct gl_texture_image *texImg = texObj->Image[j][i];
         if (texImg) {
            printf("  Face %u level %u: %d x %d x %d, format %s\n",
		   j, i,
		   texImg->Width, texImg->Height, texImg->Depth,
		   _mesa_get_format_name(texImg->TexFormat));
            if (writeImages == WRITE_ALL ||
                (writeImages == WRITE_ONE && !written)) {
               write_texture_image(texObj, j, i);
               written = GL_TRUE;
            }
         }
      }
   }
}


/**
 * Dump a single texture.
 */
void
_mesa_dump_texture(GLuint texture, GLuint writeImages)
{
   GET_CURRENT_CONTEXT(ctx);
   struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
   if (texObj) {
      dump_texture(texObj, writeImages);
   }
}


static void
dump_texture_cb(GLuint id, void *data, void *userData)
{
   struct gl_texture_object *texObj = (struct gl_texture_object *) data;
   (void) userData;
   dump_texture(texObj, WriteImages);
}


/**
 * Print basic info about all texture objext to stdout.
 * If dumpImages is true, write PPM of level[0] image to a file.
 */
void
_mesa_dump_textures(GLuint writeImages)
{
   GET_CURRENT_CONTEXT(ctx);
   WriteImages = writeImages;
   _mesa_HashWalk(ctx->Shared->TexObjects, dump_texture_cb, ctx);
}


static void
dump_renderbuffer(const struct gl_renderbuffer *rb, GLboolean writeImage)
{
   printf("Renderbuffer %u: %u x %u  IntFormat = %s\n",
	  rb->Name, rb->Width, rb->Height,
	  _mesa_lookup_enum_by_nr(rb->InternalFormat));
   if (writeImage) {
      _mesa_write_renderbuffer_image(rb);
   }
}


static void
dump_renderbuffer_cb(GLuint id, void *data, void *userData)
{
   const struct gl_renderbuffer *rb = (const struct gl_renderbuffer *) data;
   (void) userData;
   dump_renderbuffer(rb, WriteImages);
}


/**
 * Print basic info about all renderbuffers to stdout.
 * If dumpImages is true, write PPM of level[0] image to a file.
 */
void
_mesa_dump_renderbuffers(GLboolean writeImages)
{
   GET_CURRENT_CONTEXT(ctx);
   WriteImages = writeImages;
   _mesa_HashWalk(ctx->Shared->RenderBuffers, dump_renderbuffer_cb, ctx);
}



void
_mesa_dump_color_buffer(const char *filename)
{
   GET_CURRENT_CONTEXT(ctx);
   const GLuint w = ctx->DrawBuffer->Width;
   const GLuint h = ctx->DrawBuffer->Height;
   GLubyte *buf;

   buf = malloc(w * h * 4);

   _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
   _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
   _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);

   _mesa_ReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);

   printf("ReadBuffer %p 0x%x  DrawBuffer %p 0x%x\n",
	  (void *) ctx->ReadBuffer->_ColorReadBuffer,
	  ctx->ReadBuffer->ColorReadBuffer,
	  (void *) ctx->DrawBuffer->_ColorDrawBuffers[0],
	  ctx->DrawBuffer->ColorDrawBuffer[0]);
   printf("Writing %d x %d color buffer to %s\n", w, h, filename);
   write_ppm(filename, buf, w, h, 4, 0, 1, 2, GL_TRUE);

   _mesa_PopClientAttrib();

   free(buf);
}


void
_mesa_dump_depth_buffer(const char *filename)
{
   GET_CURRENT_CONTEXT(ctx);
   const GLuint w = ctx->DrawBuffer->Width;
   const GLuint h = ctx->DrawBuffer->Height;
   GLuint *buf;
   GLubyte *buf2;
   GLuint i;

   buf = malloc(w * h * 4);  /* 4 bpp */
   buf2 = malloc(w * h * 3); /* 3 bpp */

   _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
   _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
   _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);

   _mesa_ReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buf);

   /* spread 24 bits of Z across R, G, B */
   for (i = 0; i < w * h; i++) {
      buf2[i*3+0] = (buf[i] >> 24) & 0xff;
      buf2[i*3+1] = (buf[i] >> 16) & 0xff;
      buf2[i*3+2] = (buf[i] >>  8) & 0xff;
   }

   printf("Writing %d x %d depth buffer to %s\n", w, h, filename);
   write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);

   _mesa_PopClientAttrib();

   free(buf);
   free(buf2);
}


void
_mesa_dump_stencil_buffer(const char *filename)
{
   GET_CURRENT_CONTEXT(ctx);
   const GLuint w = ctx->DrawBuffer->Width;
   const GLuint h = ctx->DrawBuffer->Height;
   GLubyte *buf;
   GLubyte *buf2;
   GLuint i;

   buf = malloc(w * h);  /* 1 bpp */
   buf2 = malloc(w * h * 3); /* 3 bpp */

   _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
   _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
   _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);

   _mesa_ReadPixels(0, 0, w, h, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, buf);

   for (i = 0; i < w * h; i++) {
      buf2[i*3+0] = buf[i];
      buf2[i*3+1] = (buf[i] & 127) * 2;
      buf2[i*3+2] = (buf[i] - 128) * 2;
   }

   printf("Writing %d x %d stencil buffer to %s\n", w, h, filename);
   write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);

   _mesa_PopClientAttrib();

   free(buf);
   free(buf2);
}


void
_mesa_dump_image(const char *filename, const void *image, GLuint w, GLuint h,
                 GLenum format, GLenum type)
{
   GLboolean invert = GL_TRUE;

   if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
      write_ppm(filename, image, w, h, 4, 0, 1, 2, invert);
   }
   else if (format == GL_BGRA && type == GL_UNSIGNED_BYTE) {
      write_ppm(filename, image, w, h, 4, 2, 1, 0, invert);
   }
   else if (format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE) {
      write_ppm(filename, image, w, h, 2, 1, 0, 0, invert);
   }
   else if (format == GL_RED && type == GL_UNSIGNED_BYTE) {
      write_ppm(filename, image, w, h, 1, 0, 0, 0, invert);
   }
   else if (format == GL_RGBA && type == GL_FLOAT) {
      /* convert floats to ubyte */
      GLubyte *buf = malloc(w * h * 4 * sizeof(GLubyte));
      const GLfloat *f = (const GLfloat *) image;
      GLuint i;
      for (i = 0; i < w * h * 4; i++) {
         UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
      }
      write_ppm(filename, buf, w, h, 4, 0, 1, 2, invert);
      free(buf);
   }
   else if (format == GL_RED && type == GL_FLOAT) {
      /* convert floats to ubyte */
      GLubyte *buf = malloc(w * h * sizeof(GLubyte));
      const GLfloat *f = (const GLfloat *) image;
      GLuint i;
      for (i = 0; i < w * h; i++) {
         UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
      }
      write_ppm(filename, buf, w, h, 1, 0, 0, 0, invert);
      free(buf);
   }
   else {
      _mesa_problem(NULL,
                 "Unsupported format 0x%x / type 0x%x in _mesa_dump_image()",
                 format, type);
   }
}


/**
 * Quick and dirty function to "print" a texture to stdout.
 */
void
_mesa_print_texture(struct gl_context *ctx, struct gl_texture_image *img)
{
   const GLint slice = 0;
   GLint srcRowStride;
   GLuint i, j, c;
   GLubyte *data;

   ctx->Driver.MapTextureImage(ctx, img, slice,
                               0, 0, img->Width, img->Height, GL_MAP_READ_BIT,
                               &data, &srcRowStride);

   if (!data) {
      printf("No texture data\n");
   }
   else {
      /* XXX add more formats or make into a new format utility function */
      switch (img->TexFormat) {
         case MESA_FORMAT_A8:
         case MESA_FORMAT_L8:
         case MESA_FORMAT_I8:
            c = 1;
            break;
         case MESA_FORMAT_AL88:
         case MESA_FORMAT_AL88_REV:
            c = 2;
            break;
         case MESA_FORMAT_RGB888:
         case MESA_FORMAT_BGR888:
            c = 3;
            break;
         case MESA_FORMAT_RGBA8888:
         case MESA_FORMAT_ARGB8888:
            c = 4;
            break;
         default:
            _mesa_problem(NULL, "error in PrintTexture\n");
            return;
      }

      for (i = 0; i < img->Height; i++) {
         for (j = 0; j < img->Width; j++) {
            if (c==1)
               printf("%02x  ", data[0]);
            else if (c==2)
               printf("%02x%02x  ", data[0], data[1]);
            else if (c==3)
               printf("%02x%02x%02x  ", data[0], data[1], data[2]);
            else if (c==4)
               printf("%02x%02x%02x%02x  ", data[0], data[1], data[2], data[3]);
            data += (srcRowStride - img->Width) * c;
         }
         /* XXX use img->ImageStride here */
         printf("\n");

      }
   }

   ctx->Driver.UnmapTextureImage(ctx, img, slice);
}