src/mesa/main/debug.c

   1 /*
   2  * Mesa 3-D graphics library
   3  *
   4  * Copyright (C) 1999-2005  Brian Paul   All Rights Reserved.
   5  * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #include <stdio.h>
  27 #include "mtypes.h"
  28 #include "attrib.h"
  29 #include "enums.h"
  30 #include "formats.h"
  31 #include "hash.h"
  32 #include "imports.h"
  33 #include "macros.h"
  34 #include "debug.h"
  35 #include "get.h"
  36 #include "pixelstore.h"
  37 #include "readpix.h"
  38 #include "texobj.h"
  39
  40
  41 static const char *
  42 tex_target_name(GLenum tgt)
  43 {
  44    static const struct {
  45       GLenum target;
  46       const char *name;
  47    } tex_targets[] = {
  48       { GL_TEXTURE_1D, "GL_TEXTURE_1D" },
  49       { GL_TEXTURE_2D, "GL_TEXTURE_2D" },
  50       { GL_TEXTURE_3D, "GL_TEXTURE_3D" },
  51       { GL_TEXTURE_CUBE_MAP, "GL_TEXTURE_CUBE_MAP" },
  52       { GL_TEXTURE_RECTANGLE, "GL_TEXTURE_RECTANGLE" },
  53       { GL_TEXTURE_1D_ARRAY_EXT, "GL_TEXTURE_1D_ARRAY" },
  54       { GL_TEXTURE_2D_ARRAY_EXT, "GL_TEXTURE_2D_ARRAY" },
  55       { GL_TEXTURE_CUBE_MAP_ARRAY, "GL_TEXTURE_CUBE_MAP_ARRAY" },
  56       { GL_TEXTURE_BUFFER, "GL_TEXTURE_BUFFER" },
  57       { GL_TEXTURE_2D_MULTISAMPLE, "GL_TEXTURE_2D_MULTISAMPLE" },
  58       { GL_TEXTURE_2D_MULTISAMPLE_ARRAY, "GL_TEXTURE_2D_MULTISAMPLE_ARRAY" },
  59       { GL_TEXTURE_EXTERNAL_OES, "GL_TEXTURE_EXTERNAL_OES" }
  60    };
  61    GLuint i;
  62    STATIC_ASSERT(ARRAY_SIZE(tex_targets) == NUM_TEXTURE_TARGETS);
  63    for (i = 0; i < ARRAY_SIZE(tex_targets); i++) {
  64       if (tex_targets[i].target == tgt)
  65          return tex_targets[i].name;
  66    }
  67    return "UNKNOWN TEX TARGET";
  68 }
  69
  70
  71 void
  72 _mesa_print_state( const char *msg, GLuint state )
  73 {
  74    _mesa_debug(NULL,
  75            "%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\n",
  76            msg,
  77            state,
  78            (state & _NEW_MODELVIEW)       ? "ctx->ModelView, " : "",
  79            (state & _NEW_PROJECTION)      ? "ctx->Projection, " : "",
  80            (state & _NEW_TEXTURE_MATRIX)  ? "ctx->TextureMatrix, " : "",
  81            (state & _NEW_COLOR)           ? "ctx->Color, " : "",
  82            (state & _NEW_DEPTH)           ? "ctx->Depth, " : "",
  83            (state & _NEW_EVAL)            ? "ctx->Eval/EvalMap, " : "",
  84            (state & _NEW_FOG)             ? "ctx->Fog, " : "",
  85            (state & _NEW_HINT)            ? "ctx->Hint, " : "",
  86            (state & _NEW_LIGHT)           ? "ctx->Light, " : "",
  87            (state & _NEW_LINE)            ? "ctx->Line, " : "",
  88            (state & _NEW_PIXEL)           ? "ctx->Pixel, " : "",
  89            (state & _NEW_POINT)           ? "ctx->Point, " : "",
  90            (state & _NEW_POLYGON)         ? "ctx->Polygon, " : "",
  91            (state & _NEW_POLYGONSTIPPLE)  ? "ctx->PolygonStipple, " : "",
  92            (state & _NEW_SCISSOR)         ? "ctx->Scissor, " : "",
  93            (state & _NEW_STENCIL)         ? "ctx->Stencil, " : "",
  94            (state & _NEW_TEXTURE)         ? "ctx->Texture, " : "",
  95            (state & _NEW_TRANSFORM)       ? "ctx->Transform, " : "",
  96            (state & _NEW_VIEWPORT)        ? "ctx->Viewport, " : "",
  97            (state & _NEW_ARRAY)           ? "ctx->Array, " : "",
  98            (state & _NEW_RENDERMODE)      ? "ctx->RenderMode, " : "",
  99            (state & _NEW_BUFFERS)         ? "ctx->Visual, ctx->DrawBuffer,, " : "");
 100 }
 101
 102
 103
 104 /**
 105  * Print information about this Mesa version and build options.
 106  */
 107 void _mesa_print_info( struct gl_context *ctx )
 108 {
 109    _mesa_debug(NULL, "Mesa GL_VERSION = %s\n",
 110            (char *) _mesa_GetString(GL_VERSION));
 111    _mesa_debug(NULL, "Mesa GL_RENDERER = %s\n",
 112            (char *) _mesa_GetString(GL_RENDERER));
 113    _mesa_debug(NULL, "Mesa GL_VENDOR = %s\n",
 114            (char *) _mesa_GetString(GL_VENDOR));
 115
 116    /* use ctx as GL_EXTENSIONS will not work on 3.0 or higher
 117     * core contexts.
 118     */
 119    _mesa_debug(NULL, "Mesa GL_EXTENSIONS = %s\n", ctx->Extensions.String);
 120
 121 #if defined(USE_X86_ASM)
 122    _mesa_debug(NULL, "Mesa x86-optimized: YES\n");
 123 #else
 124    _mesa_debug(NULL, "Mesa x86-optimized: NO\n");
 125 #endif
 126 #if defined(USE_SPARC_ASM)
 127    _mesa_debug(NULL, "Mesa sparc-optimized: YES\n");
 128 #else
 129    _mesa_debug(NULL, "Mesa sparc-optimized: NO\n");
 130 #endif
 131 }
 132
 133
 134 /**
 135  * Set verbose logging flags.  When these flags are set, GL API calls
 136  * in the various categories will be printed to stderr.
 137  * \param str  a comma-separated list of keywords
 138  */
 139 static void
 140 set_verbose_flags(const char *str)
 141 {
 142 #ifdef DEBUG
 143    struct option {
 144       const char *name;
 145       GLbitfield flag;
 146    };
 147    static const struct option opts[] = {
 148       { "varray",    VERBOSE_VARRAY },
 149       { "tex",       VERBOSE_TEXTURE },
 150       { "mat",       VERBOSE_MATERIAL },
 151       { "pipe",      VERBOSE_PIPELINE },
 152       { "driver",    VERBOSE_DRIVER },
 153       { "state",     VERBOSE_STATE },
 154       { "api",       VERBOSE_API },
 155       { "list",      VERBOSE_DISPLAY_LIST },
 156       { "lighting",  VERBOSE_LIGHTING },
 157       { "disassem",  VERBOSE_DISASSEM },
 158       { "draw",      VERBOSE_DRAW },
 159       { "swap",      VERBOSE_SWAPBUFFERS }
 160    };
 161    GLuint i;
 162
 163    if (!str)
 164       return;
 165
 166    MESA_VERBOSE = 0x0;
 167    for (i = 0; i < ARRAY_SIZE(opts); i++) {
 168       if (strstr(str, opts[i].name) || strcmp(str, "all") == 0)
 169          MESA_VERBOSE |= opts[i].flag;
 170    }
 171 #endif
 172 }
 173
 174
 175 /**
 176  * Set debugging flags.  When these flags are set, Mesa will do additional
 177  * debug checks or actions.
 178  * \param str  a comma-separated list of keywords
 179  */
 180 static void
 181 set_debug_flags(const char *str)
 182 {
 183 #ifdef DEBUG
 184    struct option {
 185       const char *name;
 186       GLbitfield flag;
 187    };
 188    static const struct option opts[] = {
 189       { "silent", DEBUG_SILENT }, /* turn off debug messages */
 190       { "flush", DEBUG_ALWAYS_FLUSH }, /* flush after each drawing command */
 191       { "incomplete_tex", DEBUG_INCOMPLETE_TEXTURE },
 192       { "incomplete_fbo", DEBUG_INCOMPLETE_FBO },
 193       { "context", DEBUG_CONTEXT } /* force set GL_CONTEXT_FLAG_DEBUG_BIT flag */
 194    };
 195    GLuint i;
 196
 197    if (!str)
 198       return;
 199
 200    MESA_DEBUG_FLAGS = 0x0;
 201    for (i = 0; i < ARRAY_SIZE(opts); i++) {
 202       if (strstr(str, opts[i].name))
 203          MESA_DEBUG_FLAGS |= opts[i].flag;
 204    }
 205 #endif
 206 }
 207
 208
 209 /**
 210  * Initialize debugging variables from env vars.
 211  */
 212 void
 213 _mesa_init_debug( struct gl_context *ctx )
 214 {
 215    set_debug_flags(getenv("MESA_DEBUG"));
 216    set_verbose_flags(getenv("MESA_VERBOSE"));
 217 }
 218
 219
 220 /*
 221  * Write ppm file
 222  */
 223 static void
 224 write_ppm(const char *filename, const GLubyte *buffer, int width, int height,
 225           int comps, int rcomp, int gcomp, int bcomp, GLboolean invert)
 226 {
 227    FILE *f = fopen( filename, "w" );
 228    if (f) {
 229       int x, y;
 230       const GLubyte *ptr = buffer;
 231       fprintf(f,"P6\n");
 232       fprintf(f,"# ppm-file created by osdemo.c\n");
 233       fprintf(f,"%i %i\n", width,height);
 234       fprintf(f,"255\n");
 235       fclose(f);
 236       f = fopen( filename, "ab" );  /* reopen in binary append mode */
 237       for (y=0; y < height; y++) {
 238          for (x = 0; x < width; x++) {
 239             int yy = invert ? (height - 1 - y) : y;
 240             int i = (yy * width + x) * comps;
 241             fputc(ptr[i+rcomp], f); /* write red */
 242             fputc(ptr[i+gcomp], f); /* write green */
 243             fputc(ptr[i+bcomp], f); /* write blue */
 244          }
 245       }
 246       fclose(f);
 247    }
 248    else {
 249       fprintf(stderr, "Unable to create %s in write_ppm()\n", filename);
 250    }
 251 }
 252
 253
 254 /**
 255  * Write a texture image to a ppm file.
 256  * \param face  cube face in [0,5]
 257  * \param level  mipmap level
 258  */
 259 static void
 260 write_texture_image(struct gl_texture_object *texObj,
 261                     GLuint face, GLuint level)
 262 {
 263    struct gl_texture_image *img = texObj->Image[face][level];
 264    if (img) {
 265       GET_CURRENT_CONTEXT(ctx);
 266       struct gl_pixelstore_attrib store;
 267       GLubyte *buffer;
 268       char s[100];
 269
 270       buffer = malloc(img->Width * img->Height
 271                                         * img->Depth * 4);
 272
 273       store = ctx->Pack; /* save */
 274       ctx->Pack = ctx->DefaultPacking;
 275
 276       ctx->Driver.GetTexSubImage(ctx,
 277                                  0, 0, 0, img->Width, img->Height, img->Depth,
 278                                  GL_RGBA, GL_UNSIGNED_BYTE, buffer, img);
 279
 280       /* make filename */
 281       _mesa_snprintf(s, sizeof(s), "/tmp/tex%u.l%u.f%u.ppm", texObj->Name, level, face);
 282
 283       printf("  Writing image level %u to %s\n", level, s);
 284       write_ppm(s, buffer, img->Width, img->Height, 4, 0, 1, 2, GL_FALSE);
 285
 286       ctx->Pack = store; /* restore */
 287
 288       free(buffer);
 289    }
 290 }
 291
 292
 293 /**
 294  * Write renderbuffer image to a ppm file.
 295  */
 296 void
 297 _mesa_write_renderbuffer_image(const struct gl_renderbuffer *rb)
 298 {
 299    GET_CURRENT_CONTEXT(ctx);
 300    GLubyte *buffer;
 301    char s[100];
 302    GLenum format, type;
 303
 304    if (rb->_BaseFormat == GL_RGB ||
 305        rb->_BaseFormat == GL_RGBA) {
 306       format = GL_RGBA;
 307       type = GL_UNSIGNED_BYTE;
 308    }
 309    else if (rb->_BaseFormat == GL_DEPTH_STENCIL) {
 310       format = GL_DEPTH_STENCIL;
 311       type = GL_UNSIGNED_INT_24_8;
 312    }
 313    else {
 314       _mesa_debug(NULL,
 315                   "Unsupported BaseFormat 0x%x in "
 316                   "_mesa_write_renderbuffer_image()\n",
 317                   rb->_BaseFormat);
 318       return;
 319    }
 320
 321    buffer = malloc(rb->Width * rb->Height * 4);
 322
 323    ctx->Driver.ReadPixels(ctx, 0, 0, rb->Width, rb->Height,
 324                           format, type, &ctx->DefaultPacking, buffer);
 325
 326    /* make filename */
 327    _mesa_snprintf(s, sizeof(s), "/tmp/renderbuffer%u.ppm", rb->Name);
 328    _mesa_snprintf(s, sizeof(s), "C:\\renderbuffer%u.ppm", rb->Name);
 329
 330    printf("  Writing renderbuffer image to %s\n", s);
 331
 332    _mesa_debug(NULL, "  Writing renderbuffer image to %s\n", s);
 333
 334    write_ppm(s, buffer, rb->Width, rb->Height, 4, 0, 1, 2, GL_TRUE);
 335
 336    free(buffer);
 337 }
 338
 339
 340 /** How many texture images (mipmap levels, faces) to write to files */
 341 #define WRITE_NONE 0
 342 #define WRITE_ONE  1
 343 #define WRITE_ALL  2
 344
 345 static GLuint WriteImages;
 346
 347
 348 static void
 349 dump_texture(struct gl_texture_object *texObj, GLuint writeImages)
 350 {
 351    const GLuint numFaces = texObj->Target == GL_TEXTURE_CUBE_MAP ? 6 : 1;
 352    GLboolean written = GL_FALSE;
 353    GLuint i, j;
 354
 355    printf("Texture %u\n", texObj->Name);
 356    printf("  Target %s\n", tex_target_name(texObj->Target));
 357    for (i = 0; i < MAX_TEXTURE_LEVELS; i++) {
 358       for (j = 0; j < numFaces; j++) {
 359          struct gl_texture_image *texImg = texObj->Image[j][i];
 360          if (texImg) {
 361             printf("  Face %u level %u: %d x %d x %d, format %s\n",
 362                    j, i,
 363                    texImg->Width, texImg->Height, texImg->Depth,
 364                    _mesa_get_format_name(texImg->TexFormat));
 365             if (writeImages == WRITE_ALL ||
 366                 (writeImages == WRITE_ONE && !written)) {
 367                write_texture_image(texObj, j, i);
 368                written = GL_TRUE;
 369             }
 370          }
 371       }
 372    }
 373 }
 374
 375
 376 /**
 377  * Dump a single texture.
 378  */
 379 void
 380 _mesa_dump_texture(GLuint texture, GLuint writeImages)
 381 {
 382    GET_CURRENT_CONTEXT(ctx);
 383    struct gl_texture_object *texObj = _mesa_lookup_texture(ctx, texture);
 384    if (texObj) {
 385       dump_texture(texObj, writeImages);
 386    }
 387 }
 388
 389
 390 static void
 391 dump_texture_cb(GLuint id, void *data, void *userData)
 392 {
 393    struct gl_texture_object *texObj = (struct gl_texture_object *) data;
 394    (void) userData;
 395    dump_texture(texObj, WriteImages);
 396 }
 397
 398
 399 /**
 400  * Print basic info about all texture objext to stdout.
 401  * If dumpImages is true, write PPM of level[0] image to a file.
 402  */
 403 void
 404 _mesa_dump_textures(GLuint writeImages)
 405 {
 406    GET_CURRENT_CONTEXT(ctx);
 407    WriteImages = writeImages;
 408    _mesa_HashWalk(ctx->Shared->TexObjects, dump_texture_cb, ctx);
 409 }
 410
 411
 412 static void
 413 dump_renderbuffer(const struct gl_renderbuffer *rb, GLboolean writeImage)
 414 {
 415    printf("Renderbuffer %u: %u x %u  IntFormat = %s\n",
 416           rb->Name, rb->Width, rb->Height,
 417           _mesa_enum_to_string(rb->InternalFormat));
 418    if (writeImage) {
 419       _mesa_write_renderbuffer_image(rb);
 420    }
 421 }
 422
 423
 424 static void
 425 dump_renderbuffer_cb(GLuint id, void *data, void *userData)
 426 {
 427    const struct gl_renderbuffer *rb = (const struct gl_renderbuffer *) data;
 428    (void) userData;
 429    dump_renderbuffer(rb, WriteImages);
 430 }
 431
 432
 433 /**
 434  * Print basic info about all renderbuffers to stdout.
 435  * If dumpImages is true, write PPM of level[0] image to a file.
 436  */
 437 void
 438 _mesa_dump_renderbuffers(GLboolean writeImages)
 439 {
 440    GET_CURRENT_CONTEXT(ctx);
 441    WriteImages = writeImages;
 442    _mesa_HashWalk(ctx->Shared->RenderBuffers, dump_renderbuffer_cb, ctx);
 443 }
 444
 445
 446
 447 void
 448 _mesa_dump_color_buffer(const char *filename)
 449 {
 450    GET_CURRENT_CONTEXT(ctx);
 451    const GLuint w = ctx->DrawBuffer->Width;
 452    const GLuint h = ctx->DrawBuffer->Height;
 453    GLubyte *buf;
 454
 455    buf = malloc(w * h * 4);
 456
 457    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 458    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 459    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 460
 461    _mesa_ReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE, buf);
 462
 463    printf("ReadBuffer %p 0x%x  DrawBuffer %p 0x%x\n",
 464           (void *) ctx->ReadBuffer->_ColorReadBuffer,
 465           ctx->ReadBuffer->ColorReadBuffer,
 466           (void *) ctx->DrawBuffer->_ColorDrawBuffers[0],
 467           ctx->DrawBuffer->ColorDrawBuffer[0]);
 468    printf("Writing %d x %d color buffer to %s\n", w, h, filename);
 469    write_ppm(filename, buf, w, h, 4, 0, 1, 2, GL_TRUE);
 470
 471    _mesa_PopClientAttrib();
 472
 473    free(buf);
 474 }
 475
 476
 477 void
 478 _mesa_dump_depth_buffer(const char *filename)
 479 {
 480    GET_CURRENT_CONTEXT(ctx);
 481    const GLuint w = ctx->DrawBuffer->Width;
 482    const GLuint h = ctx->DrawBuffer->Height;
 483    GLuint *buf;
 484    GLubyte *buf2;
 485    GLuint i;
 486
 487    buf = malloc(w * h * 4);  /* 4 bpp */
 488    buf2 = malloc(w * h * 3); /* 3 bpp */
 489
 490    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 491    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 492    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 493
 494    _mesa_ReadPixels(0, 0, w, h, GL_DEPTH_COMPONENT, GL_UNSIGNED_INT, buf);
 495
 496    /* spread 24 bits of Z across R, G, B */
 497    for (i = 0; i < w * h; i++) {
 498       buf2[i*3+0] = (buf[i] >> 24) & 0xff;
 499       buf2[i*3+1] = (buf[i] >> 16) & 0xff;
 500       buf2[i*3+2] = (buf[i] >>  8) & 0xff;
 501    }
 502
 503    printf("Writing %d x %d depth buffer to %s\n", w, h, filename);
 504    write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
 505
 506    _mesa_PopClientAttrib();
 507
 508    free(buf);
 509    free(buf2);
 510 }
 511
 512
 513 void
 514 _mesa_dump_stencil_buffer(const char *filename)
 515 {
 516    GET_CURRENT_CONTEXT(ctx);
 517    const GLuint w = ctx->DrawBuffer->Width;
 518    const GLuint h = ctx->DrawBuffer->Height;
 519    GLubyte *buf;
 520    GLubyte *buf2;
 521    GLuint i;
 522
 523    buf = malloc(w * h);  /* 1 bpp */
 524    buf2 = malloc(w * h * 3); /* 3 bpp */
 525
 526    _mesa_PushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
 527    _mesa_PixelStorei(GL_PACK_ALIGNMENT, 1);
 528    _mesa_PixelStorei(GL_PACK_INVERT_MESA, GL_TRUE);
 529
 530    _mesa_ReadPixels(0, 0, w, h, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, buf);
 531
 532    for (i = 0; i < w * h; i++) {
 533       buf2[i*3+0] = buf[i];
 534       buf2[i*3+1] = (buf[i] & 127) * 2;
 535       buf2[i*3+2] = (buf[i] - 128) * 2;
 536    }
 537
 538    printf("Writing %d x %d stencil buffer to %s\n", w, h, filename);
 539    write_ppm(filename, buf2, w, h, 3, 0, 1, 2, GL_TRUE);
 540
 541    _mesa_PopClientAttrib();
 542
 543    free(buf);
 544    free(buf2);
 545 }
 546
 547
 548 void
 549 _mesa_dump_image(const char *filename, const void *image, GLuint w, GLuint h,
 550                  GLenum format, GLenum type)
 551 {
 552    GLboolean invert = GL_TRUE;
 553
 554    if (format == GL_RGBA && type == GL_UNSIGNED_BYTE) {
 555       write_ppm(filename, image, w, h, 4, 0, 1, 2, invert);
 556    }
 557    else if (format == GL_BGRA && type == GL_UNSIGNED_BYTE) {
 558       write_ppm(filename, image, w, h, 4, 2, 1, 0, invert);
 559    }
 560    else if (format == GL_LUMINANCE_ALPHA && type == GL_UNSIGNED_BYTE) {
 561       write_ppm(filename, image, w, h, 2, 1, 0, 0, invert);
 562    }
 563    else if (format == GL_RED && type == GL_UNSIGNED_BYTE) {
 564       write_ppm(filename, image, w, h, 1, 0, 0, 0, invert);
 565    }
 566    else if (format == GL_RGBA && type == GL_FLOAT) {
 567       /* convert floats to ubyte */
 568       GLubyte *buf = malloc(w * h * 4 * sizeof(GLubyte));
 569       const GLfloat *f = (const GLfloat *) image;
 570       GLuint i;
 571       for (i = 0; i < w * h * 4; i++) {
 572          UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
 573       }
 574       write_ppm(filename, buf, w, h, 4, 0, 1, 2, invert);
 575       free(buf);
 576    }
 577    else if (format == GL_RED && type == GL_FLOAT) {
 578       /* convert floats to ubyte */
 579       GLubyte *buf = malloc(w * h * sizeof(GLubyte));
 580       const GLfloat *f = (const GLfloat *) image;
 581       GLuint i;
 582       for (i = 0; i < w * h; i++) {
 583          UNCLAMPED_FLOAT_TO_UBYTE(buf[i], f[i]);
 584       }
 585       write_ppm(filename, buf, w, h, 1, 0, 0, 0, invert);
 586       free(buf);
 587    }
 588    else {
 589       _mesa_problem(NULL,
 590                  "Unsupported format 0x%x / type 0x%x in _mesa_dump_image()",
 591                  format, type);
 592    }
 593 }
 594
 595
 596 /**
 597  * Quick and dirty function to "print" a texture to stdout.
 598  */
 599 void
 600 _mesa_print_texture(struct gl_context *ctx, struct gl_texture_image *img)
 601 {
 602    const GLint slice = 0;
 603    GLint srcRowStride;
 604    GLuint i, j, c;
 605    GLubyte *data;
 606
 607    ctx->Driver.MapTextureImage(ctx, img, slice,
 608                                0, 0, img->Width, img->Height, GL_MAP_READ_BIT,
 609                                &data, &srcRowStride);
 610
 611    if (!data) {
 612       printf("No texture data\n");
 613    }
 614    else {
 615       /* XXX add more formats or make into a new format utility function */
 616       switch (img->TexFormat) {
 617          case MESA_FORMAT_A_UNORM8:
 618          case MESA_FORMAT_L_UNORM8:
 619          case MESA_FORMAT_I_UNORM8:
 620             c = 1;
 621             break;
 622          case MESA_FORMAT_L8A8_UNORM:
 623          case MESA_FORMAT_A8L8_UNORM:
 624             c = 2;
 625             break;
 626          case MESA_FORMAT_BGR_UNORM8:
 627          case MESA_FORMAT_RGB_UNORM8:
 628             c = 3;
 629             break;
 630          case MESA_FORMAT_A8B8G8R8_UNORM:
 631          case MESA_FORMAT_B8G8R8A8_UNORM:
 632             c = 4;
 633             break;
 634          default:
 635             _mesa_problem(NULL, "error in PrintTexture\n");
 636             return;
 637       }
 638
 639       for (i = 0; i < img->Height; i++) {
 640          for (j = 0; j < img->Width; j++) {
 641             if (c==1)
 642                printf("%02x  ", data[0]);
 643             else if (c==2)
 644                printf("%02x%02x  ", data[0], data[1]);
 645             else if (c==3)
 646                printf("%02x%02x%02x  ", data[0], data[1], data[2]);
 647             else if (c==4)
 648                printf("%02x%02x%02x%02x  ", data[0], data[1], data[2], data[3]);
 649             data += (srcRowStride - img->Width) * c;
 650          }
 651          /* XXX use img->ImageStride here */
 652          printf("\n");
 653
 654       }
 655    }
 656
 657    ctx->Driver.UnmapTextureImage(ctx, img, slice);
 658 }