src/mesa/main/texformat.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  7.7
   4  *
   5  * Copyright (C) 1999-2008  Brian Paul   All Rights Reserved.
   6  * Copyright (c) 2008-2009 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 texformat.c
  29  * Texture formats.
  30  *
  31  * \author Gareth Hughes
  32  * \author Brian Paul
  33  */
  34
  35
  36 #include "context.h"
  37 #include "texcompress.h"
  38 #include "texformat.h"
  39
  40
  41 /**
  42  * Choose an appropriate texture format given the format, type and
  43  * internalFormat parameters passed to glTexImage().
  44  *
  45  * \param ctx  the GL context.
  46  * \param internalFormat  user's prefered internal texture format.
  47  * \param format  incoming image pixel format.
  48  * \param type  incoming image data type.
  49  *
  50  * \return a pointer to a gl_texture_format object which describes the
  51  * choosen texture format, or NULL on failure.
  52  *
  53  * This is called via dd_function_table::ChooseTextureFormat.  Hardware drivers
  54  * will typically override this function with a specialized version.
  55  */
  56 gl_format
  57 _mesa_choose_tex_format( struct gl_context *ctx, GLint internalFormat,
  58                          GLenum format, GLenum type )
  59 {
  60    (void) format;
  61    (void) type;
  62
  63    switch (internalFormat) {
  64       /* shallow RGBA formats */
  65       case 4:
  66       case GL_RGBA:
  67       case GL_RGBA8:
  68          return MESA_FORMAT_RGBA8888;
  69       case GL_RGB5_A1:
  70          return MESA_FORMAT_ARGB1555;
  71       case GL_RGBA2:
  72          return MESA_FORMAT_ARGB4444_REV; /* just to test another format*/
  73       case GL_RGBA4:
  74          return MESA_FORMAT_ARGB4444;
  75
  76       /* deep RGBA formats */
  77       case GL_RGB10_A2:
  78          return MESA_FORMAT_ARGB2101010;
  79
  80       case GL_RGBA12:
  81       case GL_RGBA16:
  82          return MESA_FORMAT_RGBA_16;
  83
  84       /* shallow RGB formats */
  85       case 3:
  86       case GL_RGB:
  87       case GL_RGB8:
  88          return MESA_FORMAT_RGB888;
  89       case GL_R3_G3_B2:
  90          return MESA_FORMAT_RGB332;
  91       case GL_RGB4:
  92          return MESA_FORMAT_RGB565_REV; /* just to test another format */
  93       case GL_RGB5:
  94          return MESA_FORMAT_RGB565;
  95
  96       /* deep RGB formats */
  97       case GL_RGB10:
  98       case GL_RGB12:
  99       case GL_RGB16:
 100          return MESA_FORMAT_RGBA_16;
 101
 102       /* Alpha formats */
 103       case GL_ALPHA:
 104       case GL_ALPHA4:
 105       case GL_ALPHA12:
 106       case GL_ALPHA16:
 107       case GL_ALPHA8:
 108          return MESA_FORMAT_A8;
 109
 110       /* Luminance formats */
 111       case 1:
 112       case GL_LUMINANCE:
 113       case GL_LUMINANCE4:
 114       case GL_LUMINANCE12:
 115       case GL_LUMINANCE16:
 116       case GL_LUMINANCE8:
 117          return MESA_FORMAT_L8;
 118
 119       /* Luminance/Alpha formats */
 120       case 2:
 121       case GL_LUMINANCE_ALPHA:
 122       case GL_LUMINANCE4_ALPHA4:
 123       case GL_LUMINANCE6_ALPHA2:
 124       case GL_LUMINANCE8_ALPHA8:
 125          return MESA_FORMAT_AL88;
 126
 127       case GL_LUMINANCE12_ALPHA4:
 128       case GL_LUMINANCE12_ALPHA12:
 129       case GL_LUMINANCE16_ALPHA16:
 130          return MESA_FORMAT_AL1616;
 131
 132       case GL_INTENSITY:
 133       case GL_INTENSITY4:
 134       case GL_INTENSITY12:
 135       case GL_INTENSITY16:
 136       case GL_INTENSITY8:
 137          return MESA_FORMAT_I8;
 138
 139       case GL_COLOR_INDEX:
 140       case GL_COLOR_INDEX1_EXT:
 141       case GL_COLOR_INDEX2_EXT:
 142       case GL_COLOR_INDEX4_EXT:
 143       case GL_COLOR_INDEX12_EXT:
 144       case GL_COLOR_INDEX16_EXT:
 145       case GL_COLOR_INDEX8_EXT:
 146          return MESA_FORMAT_CI8;
 147
 148       default:
 149          ; /* fallthrough */
 150    }
 151
 152    if (ctx->Extensions.ARB_depth_texture) {
 153       switch (internalFormat) {
 154          case GL_DEPTH_COMPONENT:
 155          case GL_DEPTH_COMPONENT24:
 156          case GL_DEPTH_COMPONENT32:
 157             return MESA_FORMAT_Z32;
 158          case GL_DEPTH_COMPONENT16:
 159             return MESA_FORMAT_Z16;
 160          default:
 161             ; /* fallthrough */
 162       }
 163    }
 164
 165    switch (internalFormat) {
 166       case GL_COMPRESSED_ALPHA_ARB:
 167          return MESA_FORMAT_A8;
 168       case GL_COMPRESSED_LUMINANCE_ARB:
 169          return MESA_FORMAT_L8;
 170       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 171          return MESA_FORMAT_AL88;
 172       case GL_COMPRESSED_INTENSITY_ARB:
 173          return MESA_FORMAT_I8;
 174       case GL_COMPRESSED_RGB_ARB:
 175          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 176              ctx->Extensions.S3_s3tc)
 177             return MESA_FORMAT_RGB_DXT1;
 178          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 179             return MESA_FORMAT_RGB_FXT1;
 180          return MESA_FORMAT_RGB888;
 181       case GL_COMPRESSED_RGBA_ARB:
 182          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 183              ctx->Extensions.S3_s3tc)
 184             return MESA_FORMAT_RGBA_DXT3; /* Not rgba_dxt1, see spec */
 185          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 186             return MESA_FORMAT_RGBA_FXT1;
 187          return MESA_FORMAT_RGBA8888;
 188       default:
 189          ; /* fallthrough */
 190    }
 191
 192    if (ctx->Extensions.MESA_ycbcr_texture) {
 193       if (internalFormat == GL_YCBCR_MESA) {
 194          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 195             return MESA_FORMAT_YCBCR;
 196          else
 197             return MESA_FORMAT_YCBCR_REV;
 198       }
 199    }
 200
 201 #if FEATURE_texture_fxt1
 202    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 203       switch (internalFormat) {
 204          case GL_COMPRESSED_RGB_FXT1_3DFX:
 205             return MESA_FORMAT_RGB_FXT1;
 206          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 207             return MESA_FORMAT_RGBA_FXT1;
 208          default:
 209             ; /* fallthrough */
 210       }
 211    }
 212 #endif
 213
 214 #if FEATURE_texture_s3tc
 215    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 216       switch (internalFormat) {
 217          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 218             return MESA_FORMAT_RGB_DXT1;
 219          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 220             return MESA_FORMAT_RGBA_DXT1;
 221          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 222             return MESA_FORMAT_RGBA_DXT3;
 223          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 224             return MESA_FORMAT_RGBA_DXT5;
 225          default:
 226             ; /* fallthrough */
 227       }
 228    }
 229
 230    if (ctx->Extensions.S3_s3tc) {
 231       switch (internalFormat) {
 232          case GL_RGB_S3TC:
 233          case GL_RGB4_S3TC:
 234             return MESA_FORMAT_RGB_DXT1;
 235          case GL_RGBA_S3TC:
 236          case GL_RGBA4_S3TC:
 237             return MESA_FORMAT_RGBA_DXT3;
 238          default:
 239             ; /* fallthrough */
 240       }
 241    }
 242 #endif
 243
 244    if (ctx->Extensions.ARB_texture_float) {
 245       switch (internalFormat) {
 246          case GL_ALPHA16F_ARB:
 247             return MESA_FORMAT_ALPHA_FLOAT16;
 248          case GL_ALPHA32F_ARB:
 249             return MESA_FORMAT_ALPHA_FLOAT32;
 250          case GL_LUMINANCE16F_ARB:
 251             return MESA_FORMAT_LUMINANCE_FLOAT16;
 252          case GL_LUMINANCE32F_ARB:
 253             return MESA_FORMAT_LUMINANCE_FLOAT32;
 254          case GL_LUMINANCE_ALPHA16F_ARB:
 255             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 256          case GL_LUMINANCE_ALPHA32F_ARB:
 257             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 258          case GL_INTENSITY16F_ARB:
 259             return MESA_FORMAT_INTENSITY_FLOAT16;
 260          case GL_INTENSITY32F_ARB:
 261             return MESA_FORMAT_INTENSITY_FLOAT32;
 262          case GL_RGB16F_ARB:
 263             return MESA_FORMAT_RGB_FLOAT16;
 264          case GL_RGB32F_ARB:
 265             return MESA_FORMAT_RGB_FLOAT32;
 266          case GL_RGBA16F_ARB:
 267             return MESA_FORMAT_RGBA_FLOAT16;
 268          case GL_RGBA32F_ARB:
 269             return MESA_FORMAT_RGBA_FLOAT32;
 270          default:
 271             ; /* fallthrough */
 272       }
 273    }
 274
 275    if (ctx->Extensions.EXT_packed_depth_stencil) {
 276       switch (internalFormat) {
 277          case GL_DEPTH_STENCIL_EXT:
 278          case GL_DEPTH24_STENCIL8_EXT:
 279             return MESA_FORMAT_Z24_S8;
 280          default:
 281             ; /* fallthrough */
 282       }
 283    }
 284
 285    if (ctx->Extensions.ATI_envmap_bumpmap) {
 286       switch (internalFormat) {
 287          case GL_DUDV_ATI:
 288          case GL_DU8DV8_ATI:
 289             return MESA_FORMAT_DUDV8;
 290          default:
 291             ; /* fallthrough */
 292       }
 293    }
 294
 295    if (ctx->Extensions.MESA_texture_signed_rgba) {
 296       switch (internalFormat) {
 297          case GL_RGBA_SNORM:
 298          case GL_RGBA8_SNORM:
 299             return MESA_FORMAT_SIGNED_RGBA8888;
 300          default:
 301             ; /* fallthrough */
 302       }
 303    }
 304
 305    if (ctx->VersionMajor * 10 + ctx->VersionMinor >= 31) {
 306       switch (internalFormat) {
 307          case GL_RED_SNORM:
 308          case GL_R8_SNORM:
 309             return MESA_FORMAT_SIGNED_R8;
 310          case GL_RG_SNORM:
 311          case GL_RG8_SNORM:
 312             return MESA_FORMAT_SIGNED_RG88;
 313          case GL_RGB_SNORM:
 314          case GL_RGB8_SNORM:
 315             return MESA_FORMAT_SIGNED_RGBX8888;
 316          case GL_RGBA_SNORM:
 317          case GL_RGBA8_SNORM:
 318             return MESA_FORMAT_SIGNED_RGBA8888;
 319          case GL_R16_SNORM:
 320             return MESA_FORMAT_SIGNED_R_16;
 321          case GL_RG16_SNORM:
 322             return MESA_FORMAT_SIGNED_RG_16;
 323          case GL_RGB16_SNORM:
 324             return MESA_FORMAT_SIGNED_RGB_16;
 325          case GL_RGBA16_SNORM:
 326             return MESA_FORMAT_SIGNED_RGBA_16;
 327          default:
 328             ; /* fall-through */
 329       }
 330    }
 331
 332 #if FEATURE_EXT_texture_sRGB
 333    if (ctx->Extensions.EXT_texture_sRGB) {
 334       switch (internalFormat) {
 335          case GL_SRGB_EXT:
 336          case GL_SRGB8_EXT:
 337             return MESA_FORMAT_SRGB8;
 338          case GL_SRGB_ALPHA_EXT:
 339          case GL_SRGB8_ALPHA8_EXT:
 340             return MESA_FORMAT_SRGBA8;
 341          case GL_SLUMINANCE_EXT:
 342          case GL_SLUMINANCE8_EXT:
 343             return MESA_FORMAT_SL8;
 344          case GL_SLUMINANCE_ALPHA_EXT:
 345          case GL_SLUMINANCE8_ALPHA8_EXT:
 346             return MESA_FORMAT_SLA8;
 347          case GL_COMPRESSED_SLUMINANCE_EXT:
 348             return MESA_FORMAT_SL8;
 349          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 350             return MESA_FORMAT_SLA8;
 351          case GL_COMPRESSED_SRGB_EXT:
 352 #if FEATURE_texture_s3tc
 353             if (ctx->Extensions.EXT_texture_compression_s3tc)
 354                return MESA_FORMAT_SRGB_DXT1;
 355 #endif
 356             return MESA_FORMAT_SRGB8;
 357          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 358 #if FEATURE_texture_s3tc
 359             if (ctx->Extensions.EXT_texture_compression_s3tc)
 360                return MESA_FORMAT_SRGBA_DXT3; /* Not srgba_dxt1, see spec */
 361 #endif
 362             return MESA_FORMAT_SRGBA8;
 363 #if FEATURE_texture_s3tc
 364          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 365             if (ctx->Extensions.EXT_texture_compression_s3tc)
 366                return MESA_FORMAT_SRGB_DXT1;
 367             break;
 368          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 369             if (ctx->Extensions.EXT_texture_compression_s3tc)
 370                return MESA_FORMAT_SRGBA_DXT1;
 371             break;
 372          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 373             if (ctx->Extensions.EXT_texture_compression_s3tc)
 374                return MESA_FORMAT_SRGBA_DXT3;
 375             break;
 376          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 377             if (ctx->Extensions.EXT_texture_compression_s3tc)
 378                return MESA_FORMAT_SRGBA_DXT5;
 379             break;
 380 #endif
 381          default:
 382             ; /* fallthrough */
 383       }
 384    }
 385 #endif /* FEATURE_EXT_texture_sRGB */
 386
 387    if (ctx->Extensions.EXT_texture_integer) {
 388       switch (internalFormat) {
 389       case GL_RGBA32UI_EXT:
 390       case GL_RGB32UI_EXT:
 391       case GL_ALPHA32UI_EXT:
 392       case GL_INTENSITY32UI_EXT:
 393       case GL_LUMINANCE32UI_EXT:
 394       case GL_LUMINANCE_ALPHA32UI_EXT:
 395          return MESA_FORMAT_RGBA_UINT32;
 396       case GL_RGBA16UI_EXT:
 397       case GL_RGB16UI_EXT:
 398       case GL_ALPHA16UI_EXT:
 399       case GL_INTENSITY16UI_EXT:
 400       case GL_LUMINANCE16UI_EXT:
 401       case GL_LUMINANCE_ALPHA16UI_EXT:
 402          return MESA_FORMAT_RGBA_UINT16;
 403       case GL_RGBA8UI_EXT:
 404       case GL_RGB8UI_EXT:
 405       case GL_ALPHA8UI_EXT:
 406       case GL_INTENSITY8UI_EXT:
 407       case GL_LUMINANCE8UI_EXT:
 408       case GL_LUMINANCE_ALPHA8UI_EXT:
 409          return MESA_FORMAT_RGBA_UINT8;
 410       case GL_RGBA32I_EXT:
 411       case GL_RGB32I_EXT:
 412       case GL_ALPHA32I_EXT:
 413       case GL_INTENSITY32I_EXT:
 414       case GL_LUMINANCE32I_EXT:
 415       case GL_LUMINANCE_ALPHA32I_EXT:
 416          return MESA_FORMAT_RGBA_INT32;
 417       case GL_RGBA16I_EXT:
 418       case GL_RGB16I_EXT:
 419       case GL_ALPHA16I_EXT:
 420       case GL_INTENSITY16I_EXT:
 421       case GL_LUMINANCE16I_EXT:
 422       case GL_LUMINANCE_ALPHA16I_EXT:
 423          return MESA_FORMAT_RGBA_INT16;
 424       case GL_RGBA8I_EXT:
 425       case GL_RGB8I_EXT:
 426       case GL_ALPHA8I_EXT:
 427       case GL_INTENSITY8I_EXT:
 428       case GL_LUMINANCE8I_EXT:
 429       case GL_LUMINANCE_ALPHA8I_EXT:
 430          return MESA_FORMAT_RGBA_INT8;
 431       }
 432    }
 433
 434    if (ctx->Extensions.ARB_texture_rg) {
 435       switch (internalFormat) {
 436       case GL_R8:
 437       case GL_RED:
 438       case GL_COMPRESSED_RED:
 439          return MESA_FORMAT_R8;
 440
 441       case GL_R16:
 442          return MESA_FORMAT_R16;
 443
 444       case GL_RG:
 445       case GL_RG8:
 446       case GL_COMPRESSED_RG:
 447          return MESA_FORMAT_RG88;
 448
 449       case GL_RG16:
 450          return MESA_FORMAT_RG1616;
 451
 452       default:
 453          ; /* fallthrough */
 454       }
 455    }
 456
 457    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 458    return MESA_FORMAT_NONE;
 459 }
 460