src/mesa/main/debug.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.5
   4  *
   5  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   6  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a
   9  * copy of this software and associated documentation files (the "Software"),
  10  * to deal in the Software without restriction, including without limitation
  11  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  12  * and/or sell copies of the Software, and to permit persons to whom the
  13  * Software is furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included
  16  * in all copies or substantial portions of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  20  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  21  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  22  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  23  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include "mtypes.h"
  27 #include "attrib.h"
  28 #include "colormac.h"
  29 #include "enums.h"
  30 #include "formats.h"
  31 #include "hash.h"
  32 #include "imports.h"
  33 #include "debug.h"
  34 #include "get.h"
  35 #include "pixelstore.h"
  36 #include "readpix.h"
  37 #include "texobj.h"
  38
  39
  40 static const char *
  41 tex_target_name(GLenum tgt)
  42 {
  43    static const struct {
  44       GLenum target;
  45       const char *name;
  46    } tex_targets[] = {
  47       { GL_TEXTURE_1D, "GL_TEXTURE_1D" },
  48       { GL_TEXTURE_2D, "GL_TEXTURE_2D" },
  49       { GL_TEXTURE_3D, "GL_TEXTURE_3D" },
  50       { GL_TEXTURE_CUBE_MAP, "GL_TEXTURE_CUBE_MAP" },
  51       { GL_TEXTURE_RECTANGLE, "GL_TEXTURE_RECTANGLE" },
  52       { GL_TEXTURE_1D_ARRAY_EXT, "GL_TEXTURE_1D_ARRAY" },
  53       { GL_TEXTURE_2D_ARRAY_EXT, "GL_TEXTURE_2D_ARRAY" }
  54    };
  55    GLuint i;
  56    for (i = 0; i < Elements(tex_targets); i++) {
  57       if (tex_targets[i].target == tgt)
  58          return tex_targets[i].name;
  59    }
  60    return "UNKNOWN TEX TARGET";
  61 }
  62
  63
  64 void
  65 _mesa_print_state( const char *msg, GLuint state )
  66 {
  67    _mesa_debug(NULL,
  68            "%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",
  69            msg,
  70            state,
  71            (state & _NEW_MODELVIEW)       ? "ctx->ModelView, " : "",
  72            (state & _NEW_PROJECTION)      ? "ctx->Projection, " : "",
  73            (state & _NEW_TEXTURE_MATRIX)  ? "ctx->TextureMatrix, " : "",
  74            (state & _NEW_COLOR)           ? "ctx->Color, " : "",
  75            (state & _NEW_DEPTH)           ? "ctx->Depth, " : "",
  76            (state & _NEW_EVAL)            ? "ctx->Eval/EvalMap, " : "",
  77            (state & _NEW_FOG)             ? "ctx->Fog, " : "",
  78            (state & _NEW_HINT)            ? "ctx->Hint, " : "",
  79            (state & _NEW_LIGHT)           ? "ctx->Light, " : "",
  80            (state & _NEW_LINE)            ? "ctx->Line, " : "",
  81            (state & _NEW_PIXEL)           ? "ctx->Pixel, " : "",
  82            (state & _NEW_POINT)           ? "ctx->Point, " : "",
  83            (state & _NEW_POLYGON)         ? "ctx->Polygon, " : "",
  84            (state & _NEW_POLYGONSTIPPLE)  ? "ctx->PolygonStipple, " : "",
  85            (state & _NEW_SCISSOR)         ? "ctx->Scissor, " : "",
  86            (state & _NEW_STENCIL)         ? "ctx->Stencil, " : "",
  87            (state & _NEW_TEXTURE)         ? "ctx->Texture, " : "",
  88            (state & _NEW_TRANSFORM)       ? "ctx->Transform, " : "",
  89            (state & _NEW_VIEWPORT)        ? "ctx->Viewport, " : "",
  90            (state & _NEW_PACKUNPACK)      ? "ctx->Pack/Unpack, " : "",
  91            (state & _NEW_ARRAY)           ? "ctx->Array, " : "",
  92            (state & _NEW_RENDERMODE)      ? "ctx->RenderMode, " : "",
  93            (state & _NEW_BUFFERS)         ? "ctx->Visual, ctx->DrawBuffer,, " : "");
  94 }
  95
  96
  97
  98 void
  99 _mesa_print_tri_caps( const char *name, GLuint flags )
 100 {
 101    _mesa_debug(NULL,
 102            "%s: (0x%x) %s%s%s%s%s%s%s%s%s%s%s%s%s\n",
 103            name,
 104            flags,
 105            (flags & DD_FLATSHADE)           ? "flat-shade, " : "",
 106            (flags & DD_SEPARATE_SPECULAR)   ? "separate-specular, " : "",
 107            (flags & DD_TRI_LIGHT_TWOSIDE)   ? "tri-light-twoside, " : "",
 108            (flags & DD_TRI_TWOSTENCIL)      ? "tri-twostencil, " : "",
 109            (flags & DD_TRI_UNFILLED)        ? "tri-unfilled, " : "",
 110            (flags & DD_TRI_STIPPLE)         ? "tri-stipple, " : "",
 111            (flags & DD_TRI_OFFSET)          ? "tri-offset, " : "",
 112            (flags & DD_TRI_SMOOTH)          ? "tri-smooth, " : "",
 113            (flags & DD_LINE_SMOOTH)         ? "line-smooth, " : "",
 114            (flags & DD_LINE_STIPPLE)        ? "line-stipple, " : "",
 115            (flags & DD_POINT_SMOOTH)        ? "point-smooth, " : "",
 116            (flags & DD_POINT_ATTEN)         ? "point-atten, " : "",
 117            (flags & DD_TRI_CULL_FRONT_BACK) ? "cull-all, " : ""
 118       );
 119 }
 120
 121
 122 /**
 123  * Print information about this Mesa version and build options.
 124  */
 125 void _mesa_print_info( void )
 126 {
 127    _mesa_debug(NULL, "Mesa GL_VERSION = %s\n",
 128            (char *) _mesa_GetString(GL_VERSION));
 129    _mesa_debug(NULL, "Mesa GL_RENDERER = %s\n",
 130            (char *) _mesa_GetString(GL_RENDERER));
 131    _mesa_debug(NULL, "Mesa GL_VENDOR = %s\n",
 132            (char *) _mesa_GetString(GL_VENDOR));
 133    _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n",
 134            (char *) _mesa_GetString(GL_EXTENSIONS));
 135 #if defined(THREADS)
 136    _mesa_debug(NULL, "Mesa thread-safe: YES\n");
 137 #else
 138    _mesa_debug(NULL, "Mesa thread-safe: NO\n");
 139 #endif
 140 #if defined(USE_X86_ASM)
 141    _mesa_debug(NULL, "Mesa x86-optimized: YES\n");
 142 #else
 143    _mesa_debug(NULL, "Mesa x86-optimized: NO\n");
 144 #endif
 145 #if defined(USE_SPARC_ASM)
 146    _mesa_debug(NULL, "Mesa sparc-optimized: YES\n");
 147 #else
 148    _mesa_debug(NULL, "Mesa sparc-optimized: NO\n");
 149 #endif
 150 }
 151
 152
 153 /**
 154  * Set the debugging flags.
 155  *
 156  * \param debug debug string
 157  *
 158  * If compiled with debugging support then search for keywords in \p debug and
 159  * enables the verbose debug output of the respective feature.
 160  */
 161 static void add_debug_flags( const char *debug )
 162 {
 163 #ifdef DEBUG
 164    struct debug_option {
 165       const char *name;
 166       GLbitfield flag;
 167    };
 168    static const struct debug_option debug_opt[] = {
 169       { "varray",    VERBOSE_VARRAY },
 170       { "tex",       VERBOSE_TEXTURE },
 171       { "mat",       VERBOSE_MATERIAL },
 172       { "pipe",      VERBOSE_PIPELINE },
 173       { "driver",    VERBOSE_DRIVER },
 174       { "state",     VERBOSE_STATE },
 175       { "api",       VERBOSE_API },
 176       { "list",      VERBOSE_DISPLAY_LIST },
 177       { "lighting",  VERBOSE_LIGHTING },
 178       { "disassem",  VERBOSE_DISASSEM },
 179       { "draw",      VERBOSE_DRAW },
 180       { "swap",      VERBOSE_SWAPBUFFERS }
 181    };
 182    GLuint i;
 183
 184    MESA_VERBOSE = 0x0;
 185    for (i = 0; i < Elements(debug_opt); i++) {
 186       if (strstr(debug, debug_opt[i].name))
 187          MESA_VERBOSE |= debug_opt[i].flag;
 188    }
 189
 190    /* Debug flag:
 191     */
 192    if (strstr(debug, "flush"))
 193       MESA_DEBUG_FLAGS |= DEBUG_ALWAYS_FLUSH;
 194
 195 #if defined(_FPU_GETCW) && defined(_FPU_SETCW)
 196    if (strstr(debug, "fpexceptions")) {
 197       /* raise FP exceptions */
 198       fpu_control_t mask;
 199       _FPU_GETCW(mask);
 200       mask &= ~(_FPU_MASK_IM | _FPU_MASK_DM | _FPU_MASK_ZM
 201                 | _FPU_MASK_OM | _FPU_MASK_UM);
 202       _FPU_SETCW(mask);
 203    }
 204 #endif
 205
 206 #else
 207    (void) debug;
 208 #endif
 209 }
 210
 211
 212 void
 213 _mesa_init_debug( struct gl_context *ctx )
 214 {
 215    char *c;
 216
 217    /* Dither disable */
 218    ctx->NoDither = _mesa_getenv("MESA_NO_DITHER") ? GL_TRUE : GL_FALSE;
 219    if (ctx->NoDither) {
 220       if (_mesa_getenv("MESA_DEBUG")) {
 221          _mesa_debug(ctx, "MESA_NO_DITHER set - dithering disabled\n");
 222       }
 223       ctx->Color.DitherFlag = GL_FALSE;
 224    }
 225
 226    c = _mesa_getenv("MESA_DEBUG");
 227    if (c)
 228       add_debug_flags(c);
 229
 230    c = _mesa_getenv("MESA_VERBOSE");
 231    if (c)
 232       add_debug_flags(c);
 233 }
 234
 235
 236 /*
 237  * Write ppm file
 238  */
 239 static void
 240 write_ppm(const char *filename, const GLubyte *buffer, int width, int height,
 241           int comps, int rcomp, int gcomp, int bcomp, GLboolean invert)
 242 {
 243    FILE *f = fopen( filename, "w" );
 244    if (f) {
 245       int x, y;
 246       const GLubyte *ptr = buffer;
 247       fprintf(f,"P6\n");
 248       fprintf(f,"# ppm-file created by osdemo.c\n");
 249       fprintf(f,"%i %i\n", width,height);
 250       fprintf(f,"255\n");
 251       fclose(f);
 252       f = fopen( filename, "ab" );  /* reopen in binary append mode */
 253       for (y=0; y < height; y++) {
 254          for (x = 0; x < width; x++) {
 255             int yy = invert ? (height - 1 - y) : y;
 256             int i = (yy * width + x) * comps;
 257             fputc(ptr[i+rcomp], f); /* write red */
 258             fputc(ptr[i+gcomp], f); /* write green */
 259             fputc(ptr[i+bcomp], f); /* write blue */
 260          }
 261       }
 262       fclose(f);
 263    }
 264 }
 265
 266
 267 /**
 268  * Write a texture image to a ppm file.
 269  * \param face  cube face in [0,5]
 270  * \param level  mipmap level
 271  */
 272 static void
 273 write_texture_image(struct gl_texture_object *texObj,
 274                     GLuint face, GLuint level)
 275 {
 276    struct gl_texture_image *img = texObj->Image[face][level];
 277    if (img) {
 278       GET_CURRENT_CONTEXT(ctx);
 279       struct gl_pixelstore_attrib store;
 280       GLubyte *buffer;
 281       char s[100];
 282
 283       buffer = (GLubyte *) malloc(img->Width * img->Height
 284                                         * img->Depth * 4);
 285
 286       store = ctx->Pack; /* save */
 287       ctx->Pack = ctx->DefaultPacking;
 288
 289       ctx->Driver.GetTexImage(ctx, texObj->Target, level,
 290                               GL_RGBA, GL_UNSIGNED_BYTE,
 291                               buffer, texObj, img);
 292
 293       /* make filename */
 294       _mesa_snprintf(s, sizeof(s), "/tmp/tex%u.l%u.f%u.ppm", texObj->Name, level, face);
 295
 296       printf("  Writing image level %u to %s\n", level, s);
 297       write_ppm(s, buffer, img->Width, img->Height, 4, 0, 1, 2, GL_FALSE);
 298
 299       ctx->Pack = store; /* restore */
 300
 301       free(buffer);
 302    }
 303 }
 304
 305
 306 /**
 307  * Write renderbuffer image to a ppm file.
 308  */
 309 void
 310 _mesa_write_renderbuffer_image(const struct gl_renderbuffer *rb)
 311 {
 312    GET_CURRENT_CONTEXT(ctx);
 313    GLubyte *buffer;
 314    char s[100];
 315    GLenum format, type;
 316
 317    if (rb->_BaseFormat == GL_RGB ||
 318        rb->_BaseFormat == GL_RGBA) {
 319       format = GL_RGBA;
 320       type = GL_UNSIGNED_BYTE;
 321    }
 322    else if (rb->_BaseFormat == GL_DEPTH_STENCIL) {
 323       format = GL_DEPTH_STENCIL;
 324       type = GL_UNSIGNED_INT_24_8;
 325    }
 326    else {
 327       _mesa_debug(NULL,
 328                   "Unsupported BaseFormat 0x%x in "
 329                   "_mesa_write_renderbuffer_image()\n",
 330                   rb->_BaseFormat);
 331       return;
 332    }
 333
 334    buffer = (GLubyte *) malloc(rb->Width * rb->Height * 4);
 335
 336    ctx->Driver.ReadPixels(ctx, 0, 0, rb->Width, rb->Height,
 337                           format, type, &ctx->DefaultPacking, buffer);
 338
 339    /* make filename */
 340    _mesa_snprintf(s, sizeof(s), "/tmp/renderbuffer%u.ppm", rb->Name);
 341    _mesa_snprintf(s, sizeof(s), "C:\\renderbuffer%u.ppm", rb->Name);
 342
 343    printf("  Writing renderbuffer image to %s\n", s);
 344
 345    _mesa_debug(NULL, "  Writing renderbuffer image to %s\n", s);
 346
 347    write_ppm(s, buffer, rb->Width, rb->Height, 4, 0, 1, 2, GL_TRUE);
 348
 349    free(buffer);
 350 }
 351
 352
 353 /** How many texture images (mipmap levels, faces) to write to files */
 354 #define WRITE_NONE 0
 355 #define WRITE_ONE  1
 356 #define WRITE_ALL  2
 357
 358 static GLuint WriteImages;
 359
 360
 361 static void
 362 dump_texture(struct gl_texture_object *texObj, GLuint writeImages)
 363 {
 364    const GLuint numFaces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 365    GLboolean written = GL_FALSE;
 366    GLuint i, j;
 367
 368    printf("Texture %u\n", texObj->Name);
 369    printf("  Target %s\n", tex_target_name(texObj->Target));
 370    for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
 371       for (j = 0; j < numFaces; j++) {
 372          struct gl_texture_image *texImg = texObj->Image[j][i];
 373          if (texImg) {
 374             printf("  Face %u level %u: %d x %d x %d, format %s at %p\n",
 375                    j, i,
 376                    texImg->Width, texImg->Height, texImg->Depth,
 377                    _mesa_get_format_name(texImg->TexFormat),
 378                    texImg->Data);
 379             if (writeImages == WRITE_ALL ||
 380                 (writeImages == WRITE_ONE && !written)) {
 381                write_texture_image(texObj, j, i);
 382                written = GL_TRUE;
 383             }
 384          }
 385       }
 386    }
 387 }
 388
 389
 390 /**
 391  * Dump a single texture.
 392  */
 393 void
 394 _mesa_dump_texture(GLuint texture, GLuint writeImages)
 395 {
 396    GET_CURRENT_CONTEXT(ctx);
 397    struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
 398    if (texObj) {
 399       dump_texture(texObj, writeImages);
 400    }
 401 }
 402
 403
 404 static void
 405 dump_texture_cb(GLuint id, void *data, void *userData)
 406 {
 407    struct gl_texture_object *texObj = (struct gl_texture_object *) data;
 408    (void) userData;
 409    dump_texture(texObj, WriteImages);
 410 }
 411
 412
 413 /**
 414  * Print basic info about all texture objext to stdout.
 415  * If dumpImages is true, write PPM of level[0] image to a file.
 416  */
 417 void
 418 _mesa_dump_textures(GLuint writeImages)
 419 {
 420    GET_CURRENT_CONTEXT(ctx);
 421    WriteImages = writeImages;
 422    _mesa_HashWalk(ctx->Shared->TexObjects, dump_texture_cb, ctx);
 423 }
 424
 425
 426 static void
 427 dump_renderbuffer(const struct gl_renderbuffer *rb, GLboolean writeImage)
 428 {
 429    printf("Renderbuffer %u: %u x %u  IntFormat = %s\n",
 430           rb->Name, rb->Width, rb->Height,
 431           _mesa_lookup_enum_by_nr(rb->InternalFormat));
 432    if (writeImage) {
 433       _mesa_write_renderbuffer_image(rb);
 434    }
 435 }
 436
 437
 438 static void
 439 dump_renderbuffer_cb(GLuint id, void *data, void *userData)
 440 {
 441    const struct gl_renderbuffer *rb = (const struct gl_renderbuffer *) data;
 442    (void) userData;
 443    dump_renderbuffer(rb, WriteImages);
 444 }
 445
 446
 447 /**
 448  * Print basic info about all renderbuffers to stdout.
 449  * If dumpImages is true, write PPM of level[0] image to a file.
 450  */
 451 void
 452 _mesa_dump_renderbuffers(GLboolean writeImages)
 453 {
 454    GET_CURRENT_CONTEXT(ctx);
 455    WriteImages = writeImages;
 456    _mesa_HashWalk(ctx->Shared->RenderBuffers, dump_renderbuffer_cb, ctx);
 457 }
 458
 459
 460
 461 void
 462 _mesa_dump_color_buffer(const char *filename)
 463 {
 464    GET_CURRENT_CONTEXT(ctx);
 465    const GLuint w = ctx->DrawBuffer->Width;
 466    const GLuint h = ctx->DrawBuffer->Height;
 467    GLubyte *buf;
 468
 469    buf = (GLubyte *) malloc(w * h * 4);
 470
 471    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 472    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 473    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 474
 475    _mesa_ReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
 476
 477    printf("ReadBuffer %p 0x%x  DrawBuffer %p 0x%x\n",
 478           (void *) ctx->ReadBuffer->_ColorReadBuffer,
 479           ctx->ReadBuffer->ColorReadBuffer,
 480           (void *) ctx->DrawBuffer->_ColorDrawBuffers[0],
 481           ctx->DrawBuffer->ColorDrawBuffer[0]);
 482    printf("Writing %d x %d color buffer to %s\n", w, h, filename);
 483    write_ppm(filename, buf, w, h, 4, 0, 1, 2, GL_TRUE);
 484
 485    _mesa_PopClientAttrib();
 486
 487    free(buf);
 488 }
 489
 490
 491 void
 492 _mesa_dump_depth_buffer(const char *filename)
 493 {
 494    GET_CURRENT_CONTEXT(ctx);
 495    const GLuint w = ctx->DrawBuffer->Width;
 496    const GLuint h = ctx->DrawBuffer->Height;
 497    GLuint *buf;
 498    GLubyte *buf2;
 499    GLuint i;
 500
 501    buf = (GLuint *) malloc(w * h * 4);  /* 4 bpp */
 502    buf2 = (GLubyte *) malloc(w * h * 3); /* 3 bpp */
 503
 504    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 505    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 506    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 507
 508    _mesa_ReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buf);
 509
 510    /* spread 24 bits of Z across R, G, B */
 511    for (i = 0; i < w * h; i++) {
 512       buf2[i*3+0] = (buf[i] >> 24) & 0xff;
 513       buf2[i*3+1] = (buf[i] >> 16) & 0xff;
 514       buf2[i*3+2] = (buf[i] >>  8) & 0xff;
 515    }
 516
 517    printf("Writing %d x %d depth buffer to %s\n", w, h, filename);
 518    write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
 519
 520    _mesa_PopClientAttrib();
 521
 522    free(buf);
 523    free(buf2);
 524 }
 525
 526
 527 void
 528 _mesa_dump_stencil_buffer(const char *filename)
 529 {
 530    GET_CURRENT_CONTEXT(ctx);
 531    const GLuint w = ctx->DrawBuffer->Width;
 532    const GLuint h = ctx->DrawBuffer->Height;
 533    GLubyte *buf;
 534    GLubyte *buf2;
 535    GLuint i;
 536
 537    buf = (GLubyte *) malloc(w * h);  /* 1 bpp */
 538    buf2 = (GLubyte *) malloc(w * h * 3); /* 3 bpp */
 539
 540    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 541    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 542    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 543
 544    _mesa_ReadPixels(0, 0, w, h, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, buf);
 545
 546    for (i = 0; i < w * h; i++) {
 547       buf2[i*3+0] = buf[i];
 548       buf2[i*3+1] = (buf[i] & 127) * 2;
 549       buf2[i*3+2] = (buf[i] - 128) * 2;
 550    }
 551
 552    printf("Writing %d x %d stencil buffer to %s\n", w, h, filename);
 553    write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
 554
 555    _mesa_PopClientAttrib();
 556
 557    free(buf);
 558    free(buf2);
 559 }
 560
 561
 562 /**
 563  * Quick and dirty function to "print" a texture to stdout.
 564  */
 565 void
 566 _mesa_print_texture(struct gl_context *ctx, const struct gl_texture_image *img)
 567 {
 568 #if CHAN_TYPE != GL_UNSIGNED_BYTE
 569    _mesa_problem(NULL, "PrintTexture not supported");
 570 #else
 571    GLuint i, j, c;
 572    const GLubyte *data = (const GLubyte *) img->Data;
 573
 574    if (!data) {
 575       printf("No texture data\n");
 576       return;
 577    }
 578
 579    /* XXX add more formats or make into a new format utility function */
 580    switch (img->TexFormat) {
 581       case MESA_FORMAT_A8:
 582       case MESA_FORMAT_L8:
 583       case MESA_FORMAT_I8:
 584       case MESA_FORMAT_CI8:
 585          c = 1;
 586          break;
 587       case MESA_FORMAT_AL88:
 588       case MESA_FORMAT_AL88_REV:
 589          c = 2;
 590          break;
 591       case MESA_FORMAT_RGB888:
 592       case MESA_FORMAT_BGR888:
 593          c = 3;
 594          break;
 595       case MESA_FORMAT_RGBA8888:
 596       case MESA_FORMAT_ARGB8888:
 597          c = 4;
 598          break;
 599       default:
 600          _mesa_problem(NULL, "error in PrintTexture\n");
 601          return;
 602    }
 603
 604    for (i = 0; i < img->Height; i++) {
 605       for (j = 0; j < img->Width; j++) {
 606          if (c==1)
 607             printf("%02x  ", data[0]);
 608          else if (c==2)
 609             printf("%02x%02x  ", data[0], data[1]);
 610          else if (c==3)
 611             printf("%02x%02x%02x  ", data[0], data[1], data[2]);
 612          else if (c==4)
 613             printf("%02x%02x%02x%02x  ", data[0], data[1], data[2], data[3]);
 614          data += (img->RowStride - img->Width) * c;
 615       }
 616       /* XXX use img->ImageStride here */
 617       printf("\n");
 618    }
 619 #endif
 620 }