texcompress.c revision aab06dc0f0bf295abe213021b79ff65d70a4f4c0
1/* 2 * Mesa 3-D graphics library 3 * Version: 6.5.1 4 * 5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved. 6 * Copyright (c) 2008 VMware, Inc. 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 27/** 28 * \file texcompress.c 29 * Helper functions for texture compression. 30 */ 31 32 33#include "glheader.h" 34#include "imports.h" 35#include "colormac.h" 36#include "formats.h" 37#include "mfeatures.h" 38#include "mtypes.h" 39#include "texcompress.h" 40#include "texcompress_fxt1.h" 41#include "texcompress_rgtc.h" 42#include "texcompress_s3tc.h" 43#include "texcompress_etc.h" 44#include "swrast/s_context.h" 45 46 47/** 48 * Get the GL base format of a specified GL compressed texture format 49 * 50 * From page 232 of the OpenGL 3.3 (Compatiblity Profile) spec: 51 * 52 * "Compressed Internal Format Base Internal Format Type 53 * --------------------------- -------------------- --------- 54 * COMPRESSED_ALPHA ALPHA Generic 55 * COMPRESSED_LUMINANCE LUMINANCE Generic 56 * COMPRESSED_LUMINANCE_ALPHA LUMINANCE_ALPHA Generic 57 * COMPRESSED_INTENSITY INTENSITY Generic 58 * COMPRESSED_RED RED Generic 59 * COMPRESSED_RG RG Generic 60 * COMPRESSED_RGB RGB Generic 61 * COMPRESSED_RGBA RGBA Generic 62 * COMPRESSED_SRGB RGB Generic 63 * COMPRESSED_SRGB_ALPHA RGBA Generic 64 * COMPRESSED_SLUMINANCE LUMINANCE Generic 65 * COMPRESSED_SLUMINANCE_ALPHA LUMINANCE_ALPHA Generic 66 * COMPRESSED_RED_RGTC1 RED Specific 67 * COMPRESSED_SIGNED_RED_RGTC1 RED Specific 68 * COMPRESSED_RG_RGTC2 RG Specific 69 * COMPRESSED_SIGNED_RG_RGTC2 RG Specific" 70 * 71 * \return 72 * The base format of \c format if \c format is a compressed format (either 73 * generic or specific. Otherwise 0 is returned. 74 */ 75GLenum 76_mesa_gl_compressed_format_base_format(GLenum format) 77{ 78 switch (format) { 79 case GL_COMPRESSED_RED: 80 case GL_COMPRESSED_RED_RGTC1: 81 case GL_COMPRESSED_SIGNED_RED_RGTC1: 82 return GL_RED; 83 84 case GL_COMPRESSED_RG: 85 case GL_COMPRESSED_RG_RGTC2: 86 case GL_COMPRESSED_SIGNED_RG_RGTC2: 87 return GL_RG; 88 89 case GL_COMPRESSED_RGB: 90 case GL_COMPRESSED_SRGB: 91 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: 92 case GL_COMPRESSED_RGB_FXT1_3DFX: 93 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT: 94 case GL_ETC1_RGB8_OES: 95 return GL_RGB; 96 97 case GL_COMPRESSED_RGBA: 98 case GL_COMPRESSED_SRGB_ALPHA: 99 case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB: 100 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB: 101 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB: 102 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB: 103 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: 104 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: 105 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: 106 case GL_COMPRESSED_RGBA_FXT1_3DFX: 107 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: 108 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: 109 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: 110 return GL_RGBA; 111 112 case GL_COMPRESSED_ALPHA: 113 return GL_ALPHA; 114 115 case GL_COMPRESSED_LUMINANCE: 116 case GL_COMPRESSED_SLUMINANCE: 117 case GL_COMPRESSED_LUMINANCE_LATC1_EXT: 118 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT: 119 return GL_LUMINANCE; 120 121 case GL_COMPRESSED_LUMINANCE_ALPHA: 122 case GL_COMPRESSED_SLUMINANCE_ALPHA: 123 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT: 124 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT: 125 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI: 126 return GL_LUMINANCE_ALPHA; 127 128 case GL_COMPRESSED_INTENSITY: 129 return GL_INTENSITY; 130 131 default: 132 return 0; 133 } 134} 135 136/** 137 * Return list of (and count of) all specific texture compression 138 * formats that are supported. 139 * 140 * Some formats are \b not returned by this function. The 141 * \c GL_COMPRESSED_TEXTURE_FORMATS query only returns formats that are 142 * "suitable for general-purpose usage." All texture compression extensions 143 * have taken this to mean either linear RGB or linear RGBA. 144 * 145 * The GL_ARB_texture_compress_rgtc spec says: 146 * 147 * "19) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and 148 * GL_COMPRESSED_TEXTURE_FORMATS queries return the RGTC formats? 149 * 150 * RESOLVED: No. 151 * 152 * The OpenGL 2.1 specification says "The only values returned 153 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those 154 * corresponding to formats suitable for general-purpose usage. 155 * The renderer will not enumerate formats with restrictions that 156 * need to be specifically understood prior to use." 157 * 158 * Compressed textures with just red or red-green components are 159 * not general-purpose so should not be returned by these queries 160 * because they have restrictions. 161 * 162 * Applications that seek to use the RGTC formats should do so 163 * by looking for this extension's name in the string returned by 164 * glGetString(GL_EXTENSIONS) rather than 165 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and 166 * GL_COMPRESSED_TEXTURE_FORMATS return." 167 * 168 * There is nearly identical wording in the GL_EXT_texture_compression_rgtc 169 * spec. 170 * 171 * The GL_EXT_texture_rRGB spec says: 172 * 173 * "22) Should the new COMPRESSED_SRGB_* formats be listed in an 174 * implementation's GL_COMPRESSED_TEXTURE_FORMATS list? 175 * 176 * RESOLVED: No. Section 3.8.1 says formats listed by 177 * GL_COMPRESSED_TEXTURE_FORMATS are "suitable for general-purpose 178 * usage." The non-linear distribution of red, green, and 179 * blue for these sRGB compressed formats makes them not really 180 * general-purpose." 181 * 182 * The GL_EXT_texture_compression_latc spec says: 183 * 184 * "16) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and 185 * GL_COMPRESSED_TEXTURE_FORMATS queries return the LATC formats? 186 * 187 * RESOLVED: No. 188 * 189 * The OpenGL 2.1 specification says "The only values returned 190 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those 191 * corresponding to formats suitable for general-purpose usage. 192 * The renderer will not enumerate formats with restrictions that 193 * need to be specifically understood prior to use." 194 * 195 * Historically, OpenGL implementation have advertised the RGB and 196 * RGBA versions of the S3TC extensions compressed format tokens 197 * through this mechanism. 198 * 199 * The specification is not sufficiently clear about what "suitable 200 * for general-purpose usage" means. Historically that seems to mean 201 * unsigned RGB or unsigned RGBA. The DXT1 format supporting alpha 202 * (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) is not exposed in the list (at 203 * least for NVIDIA drivers) because the alpha is always 1.0 expect 204 * when it is 0.0 when RGB is required to be black. NVIDIA's even 205 * limits itself to true linear RGB or RGBA formats, specifically 206 * not including EXT_texture_sRGB's sRGB S3TC compressed formats. 207 * 208 * Adding luminance and luminance-alpha texture formats (and 209 * certainly signed versions of luminance and luminance-alpha 210 * formats!) invites potential comptaibility problems with old 211 * applications using this mechanism since old applications are 212 * unlikely to expect non-RGB or non-RGBA formats to be advertised 213 * through this mechanism. However no specific misinteractions 214 * with old applications is known. 215 * 216 * Applications that seek to use the LATC formats should do so 217 * by looking for this extension's name in the string returned by 218 * glGetString(GL_EXTENSIONS) rather than 219 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and 220 * GL_COMPRESSED_TEXTURE_FORMATS return." 221 * 222 * There is no formal spec for GL_ATI_texture_compression_3dc. Since the 223 * formats added by this extension are luminance-alpha formats, it is 224 * reasonable to expect them to follow the same rules as 225 * GL_EXT_texture_compression_latc. At the very least, Catalyst 11.6 does not 226 * expose the 3dc formats through this mechanism. 227 * 228 * \param ctx the GL context 229 * \param formats the resulting format list (may be NULL). 230 * 231 * \return number of formats. 232 */ 233GLuint 234_mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats) 235{ 236 GLuint n = 0; 237 if (ctx->Extensions.TDFX_texture_compression_FXT1) { 238 if (formats) { 239 formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX; 240 formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX; 241 } 242 else { 243 n += 2; 244 } 245 } 246 247 if (ctx->Extensions.EXT_texture_compression_s3tc) { 248 if (formats) { 249 formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT; 250 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; 251 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; 252 } 253 else { 254 n += 3; 255 } 256 } 257 if (ctx->Extensions.S3_s3tc) { 258 if (formats) { 259 formats[n++] = GL_RGB_S3TC; 260 formats[n++] = GL_RGB4_S3TC; 261 formats[n++] = GL_RGBA_S3TC; 262 formats[n++] = GL_RGBA4_S3TC; 263 } 264 else { 265 n += 4; 266 } 267 } 268 269 if (ctx->Extensions.OES_compressed_ETC1_RGB8_texture) { 270 if (formats) { 271 formats[n++] = GL_ETC1_RGB8_OES; 272 } 273 else { 274 n += 1; 275 } 276 } 277 278#if FEATURE_ES1 279 if (ctx->API == API_OPENGLES) { 280 if (formats) { 281 formats[n++] = GL_PALETTE4_RGB8_OES; 282 formats[n++] = GL_PALETTE4_RGBA8_OES; 283 formats[n++] = GL_PALETTE4_R5_G6_B5_OES; 284 formats[n++] = GL_PALETTE4_RGBA4_OES; 285 formats[n++] = GL_PALETTE4_RGB5_A1_OES; 286 formats[n++] = GL_PALETTE8_RGB8_OES; 287 formats[n++] = GL_PALETTE8_RGBA8_OES; 288 formats[n++] = GL_PALETTE8_R5_G6_B5_OES; 289 formats[n++] = GL_PALETTE8_RGBA4_OES; 290 formats[n++] = GL_PALETTE8_RGB5_A1_OES; 291 } 292 else { 293 n += 10; 294 } 295 } 296#endif 297 298 return n; 299} 300 301 302/** 303 * Convert a compressed MESA_FORMAT_x to a GLenum. 304 */ 305gl_format 306_mesa_glenum_to_compressed_format(GLenum format) 307{ 308 switch (format) { 309 case GL_COMPRESSED_RGB_FXT1_3DFX: 310 return MESA_FORMAT_RGB_FXT1; 311 case GL_COMPRESSED_RGBA_FXT1_3DFX: 312 return MESA_FORMAT_RGBA_FXT1; 313 314 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT: 315 case GL_RGB_S3TC: 316 return MESA_FORMAT_RGB_DXT1; 317 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT: 318 case GL_RGB4_S3TC: 319 return MESA_FORMAT_RGBA_DXT1; 320 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT: 321 case GL_RGBA_S3TC: 322 return MESA_FORMAT_RGBA_DXT3; 323 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT: 324 case GL_RGBA4_S3TC: 325 return MESA_FORMAT_RGBA_DXT5; 326 327 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT: 328 return MESA_FORMAT_SRGB_DXT1; 329 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT: 330 return MESA_FORMAT_SRGBA_DXT1; 331 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT: 332 return MESA_FORMAT_SRGBA_DXT3; 333 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT: 334 return MESA_FORMAT_SRGBA_DXT5; 335 336 case GL_COMPRESSED_RED_RGTC1: 337 return MESA_FORMAT_RED_RGTC1; 338 case GL_COMPRESSED_SIGNED_RED_RGTC1: 339 return MESA_FORMAT_SIGNED_RED_RGTC1; 340 case GL_COMPRESSED_RG_RGTC2: 341 return MESA_FORMAT_RG_RGTC2; 342 case GL_COMPRESSED_SIGNED_RG_RGTC2: 343 return MESA_FORMAT_SIGNED_RG_RGTC2; 344 345 case GL_COMPRESSED_LUMINANCE_LATC1_EXT: 346 return MESA_FORMAT_L_LATC1; 347 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT: 348 return MESA_FORMAT_SIGNED_L_LATC1; 349 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT: 350 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI: 351 return MESA_FORMAT_LA_LATC2; 352 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT: 353 return MESA_FORMAT_SIGNED_LA_LATC2; 354 355 case GL_ETC1_RGB8_OES: 356 return MESA_FORMAT_ETC1_RGB8; 357 358 default: 359 return MESA_FORMAT_NONE; 360 } 361} 362 363 364/** 365 * Given a compressed MESA_FORMAT_x value, return the corresponding 366 * GLenum for that format. 367 * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT) 368 * which must return the specific texture format used when the user might 369 * have originally specified a generic compressed format in their 370 * glTexImage2D() call. 371 * For non-compressed textures, we always return the user-specified 372 * internal format unchanged. 373 */ 374GLenum 375_mesa_compressed_format_to_glenum(struct gl_context *ctx, gl_format mesaFormat) 376{ 377 switch (mesaFormat) { 378#if FEATURE_texture_fxt1 379 case MESA_FORMAT_RGB_FXT1: 380 return GL_COMPRESSED_RGB_FXT1_3DFX; 381 case MESA_FORMAT_RGBA_FXT1: 382 return GL_COMPRESSED_RGBA_FXT1_3DFX; 383#endif 384#if FEATURE_texture_s3tc 385 case MESA_FORMAT_RGB_DXT1: 386 return GL_COMPRESSED_RGB_S3TC_DXT1_EXT; 387 case MESA_FORMAT_RGBA_DXT1: 388 return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT; 389 case MESA_FORMAT_RGBA_DXT3: 390 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT; 391 case MESA_FORMAT_RGBA_DXT5: 392 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT; 393#if FEATURE_EXT_texture_sRGB 394 case MESA_FORMAT_SRGB_DXT1: 395 return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT; 396 case MESA_FORMAT_SRGBA_DXT1: 397 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT; 398 case MESA_FORMAT_SRGBA_DXT3: 399 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT; 400 case MESA_FORMAT_SRGBA_DXT5: 401 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT; 402#endif 403#endif 404 405 case MESA_FORMAT_RED_RGTC1: 406 return GL_COMPRESSED_RED_RGTC1; 407 case MESA_FORMAT_SIGNED_RED_RGTC1: 408 return GL_COMPRESSED_SIGNED_RED_RGTC1; 409 case MESA_FORMAT_RG_RGTC2: 410 return GL_COMPRESSED_RG_RGTC2; 411 case MESA_FORMAT_SIGNED_RG_RGTC2: 412 return GL_COMPRESSED_SIGNED_RG_RGTC2; 413 414 case MESA_FORMAT_L_LATC1: 415 return GL_COMPRESSED_LUMINANCE_LATC1_EXT; 416 case MESA_FORMAT_SIGNED_L_LATC1: 417 return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT; 418 case MESA_FORMAT_LA_LATC2: 419 return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT; 420 case MESA_FORMAT_SIGNED_LA_LATC2: 421 return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT; 422 423 case MESA_FORMAT_ETC1_RGB8: 424 return GL_ETC1_RGB8_OES; 425 426 default: 427 _mesa_problem(ctx, "Unexpected mesa texture format in" 428 " _mesa_compressed_format_to_glenum()"); 429 return 0; 430 } 431} 432 433 434/* 435 * Return the address of the pixel at (col, row, img) in a 436 * compressed texture image. 437 * \param col, row, img - image position (3D), should be a multiple of the 438 * format's block size. 439 * \param format - compressed image format 440 * \param width - image width (stride) in pixels 441 * \param image - the image address 442 * \return address of pixel at (row, col, img) 443 */ 444GLubyte * 445_mesa_compressed_image_address(GLint col, GLint row, GLint img, 446 gl_format mesaFormat, 447 GLsizei width, const GLubyte *image) 448{ 449 /* XXX only 2D images implemented, not 3D */ 450 const GLuint blockSize = _mesa_get_format_bytes(mesaFormat); 451 GLuint bw, bh; 452 GLint offset; 453 454 _mesa_get_format_block_size(mesaFormat, &bw, &bh); 455 456 ASSERT(col % bw == 0); 457 ASSERT(row % bh == 0); 458 459 offset = ((width + bw - 1) / bw) * (row / bh) + col / bw; 460 offset *= blockSize; 461 462 return (GLubyte *) image + offset; 463} 464 465 466/** 467 * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image. 468 * \param srcRowStride stride in bytes between rows of blocks in the 469 * compressed source image. 470 */ 471void 472_mesa_decompress_image(gl_format format, GLuint width, GLuint height, 473 const GLubyte *src, GLint srcRowStride, 474 GLfloat *dest) 475{ 476 void (*fetch)(const struct swrast_texture_image *texImage, 477 GLint i, GLint j, GLint k, GLfloat *texel); 478 struct swrast_texture_image texImage; /* dummy teximage */ 479 GLuint i, j; 480 GLuint bytes, bw, bh; 481 482 bytes = _mesa_get_format_bytes(format); 483 _mesa_get_format_block_size(format, &bw, &bh); 484 485 /* setup dummy texture image info */ 486 memset(&texImage, 0, sizeof(texImage)); 487 texImage.Map = (void *) src; 488 489 /* XXX This line is a bit of a hack to adapt to the row stride 490 * convention used by the texture decompression functions. 491 */ 492 texImage.RowStride = srcRowStride * bh / bytes; 493 494 switch (format) { 495 /* DXT formats */ 496 case MESA_FORMAT_RGB_DXT1: 497 fetch = _mesa_fetch_texel_2d_f_rgb_dxt1; 498 break; 499 case MESA_FORMAT_RGBA_DXT1: 500 fetch = _mesa_fetch_texel_2d_f_rgba_dxt1; 501 break; 502 case MESA_FORMAT_RGBA_DXT3: 503 fetch = _mesa_fetch_texel_2d_f_rgba_dxt3; 504 break; 505 case MESA_FORMAT_RGBA_DXT5: 506 fetch = _mesa_fetch_texel_2d_f_rgba_dxt5; 507 break; 508 509 /* FXT1 formats */ 510 case MESA_FORMAT_RGB_FXT1: 511 fetch = _mesa_fetch_texel_2d_f_rgb_fxt1; 512 break; 513 case MESA_FORMAT_RGBA_FXT1: 514 fetch = _mesa_fetch_texel_2d_f_rgba_fxt1; 515 break; 516 517 /* Red/RG formats */ 518 case MESA_FORMAT_RED_RGTC1: 519 fetch = _mesa_fetch_texel_2d_f_red_rgtc1; 520 break; 521 case MESA_FORMAT_SIGNED_RED_RGTC1: 522 fetch = _mesa_fetch_texel_2d_f_signed_red_rgtc1; 523 break; 524 case MESA_FORMAT_RG_RGTC2: 525 fetch = _mesa_fetch_texel_2d_f_rg_rgtc2; 526 break; 527 case MESA_FORMAT_SIGNED_RG_RGTC2: 528 fetch = _mesa_fetch_texel_2d_f_signed_rg_rgtc2; 529 break; 530 531 /* L/LA formats */ 532 case MESA_FORMAT_L_LATC1: 533 fetch = _mesa_fetch_texel_2d_f_l_latc1; 534 break; 535 case MESA_FORMAT_SIGNED_L_LATC1: 536 fetch = _mesa_fetch_texel_2d_f_signed_l_latc1; 537 break; 538 case MESA_FORMAT_LA_LATC2: 539 fetch = _mesa_fetch_texel_2d_f_la_latc2; 540 break; 541 case MESA_FORMAT_SIGNED_LA_LATC2: 542 fetch = _mesa_fetch_texel_2d_f_signed_la_latc2; 543 break; 544 545 /* ETC1 formats */ 546 case MESA_FORMAT_ETC1_RGB8: 547 fetch = _mesa_fetch_texel_2d_f_etc1_rgb8; 548 break; 549 550 default: 551 _mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()"); 552 return; 553 } 554 555 for (j = 0; j < height; j++) { 556 for (i = 0; i < width; i++) { 557 fetch(&texImage, i, j, 0, dest); 558 dest += 4; 559 } 560 } 561} 562