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( GLcontext *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       case GL_RGBA12:
  79       case GL_RGBA16:
  80          return MESA_FORMAT_RGBA_16;
  81
  82       /* shallow RGB formats */
  83       case 3:
  84       case GL_RGB:
  85       case GL_RGB8:
  86          return MESA_FORMAT_RGB888;
  87       case GL_R3_G3_B2:
  88          return MESA_FORMAT_RGB332;
  89       case GL_RGB4:
  90          return MESA_FORMAT_RGB565_REV; /* just to test another format */
  91       case GL_RGB5:
  92          return MESA_FORMAT_RGB565;
  93
  94       /* deep RGB formats */
  95       case GL_RGB10:
  96       case GL_RGB12:
  97       case GL_RGB16:
  98          return MESA_FORMAT_RGBA_16;
  99
 100       /* Alpha formats */
 101       case GL_ALPHA:
 102       case GL_ALPHA4:
 103       case GL_ALPHA12:
 104       case GL_ALPHA16:
 105       case GL_ALPHA8:
 106          return MESA_FORMAT_A8;
 107
 108       /* Luminance formats */
 109       case 1:
 110       case GL_LUMINANCE:
 111       case GL_LUMINANCE4:
 112       case GL_LUMINANCE12:
 113       case GL_LUMINANCE16:
 114       case GL_LUMINANCE8:
 115          return MESA_FORMAT_L8;
 116
 117       /* Luminance/Alpha formats */
 118       case 2:
 119       case GL_LUMINANCE_ALPHA:
 120       case GL_LUMINANCE4_ALPHA4:
 121       case GL_LUMINANCE6_ALPHA2:
 122       case GL_LUMINANCE8_ALPHA8:
 123          return MESA_FORMAT_AL88;
 124
 125       case GL_LUMINANCE12_ALPHA4:
 126       case GL_LUMINANCE12_ALPHA12:
 127       case GL_LUMINANCE16_ALPHA16:
 128          return MESA_FORMAT_AL1616;
 129
 130       case GL_INTENSITY:
 131       case GL_INTENSITY4:
 132       case GL_INTENSITY12:
 133       case GL_INTENSITY16:
 134       case GL_INTENSITY8:
 135          return MESA_FORMAT_I8;
 136
 137       case GL_COLOR_INDEX:
 138       case GL_COLOR_INDEX1_EXT:
 139       case GL_COLOR_INDEX2_EXT:
 140       case GL_COLOR_INDEX4_EXT:
 141       case GL_COLOR_INDEX12_EXT:
 142       case GL_COLOR_INDEX16_EXT:
 143       case GL_COLOR_INDEX8_EXT:
 144          return MESA_FORMAT_CI8;
 145
 146       default:
 147          ; /* fallthrough */
 148    }
 149
 150    if (ctx->Extensions.ARB_depth_texture) {
 151       switch (internalFormat) {
 152          case GL_DEPTH_COMPONENT:
 153          case GL_DEPTH_COMPONENT24:
 154          case GL_DEPTH_COMPONENT32:
 155             return MESA_FORMAT_Z32;
 156          case GL_DEPTH_COMPONENT16:
 157             return MESA_FORMAT_Z16;
 158          default:
 159             ; /* fallthrough */
 160       }
 161    }
 162
 163    switch (internalFormat) {
 164       case GL_COMPRESSED_ALPHA_ARB:
 165          return MESA_FORMAT_A8;
 166       case GL_COMPRESSED_LUMINANCE_ARB:
 167          return MESA_FORMAT_L8;
 168       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 169          return MESA_FORMAT_AL88;
 170       case GL_COMPRESSED_INTENSITY_ARB:
 171          return MESA_FORMAT_I8;
 172       case GL_COMPRESSED_RGB_ARB:
 173          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 174              ctx->Extensions.S3_s3tc)
 175             return MESA_FORMAT_RGB_DXT1;
 176          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 177             return MESA_FORMAT_RGB_FXT1;
 178          return MESA_FORMAT_RGB888;
 179       case GL_COMPRESSED_RGBA_ARB:
 180          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 181              ctx->Extensions.S3_s3tc)
 182             return MESA_FORMAT_RGBA_DXT3; /* Not rgba_dxt1, see spec */
 183          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 184             return MESA_FORMAT_RGBA_FXT1;
 185          return MESA_FORMAT_RGBA8888;
 186       default:
 187          ; /* fallthrough */
 188    }
 189
 190    if (ctx->Extensions.MESA_ycbcr_texture) {
 191       if (internalFormat == GL_YCBCR_MESA) {
 192          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 193             return MESA_FORMAT_YCBCR;
 194          else
 195             return MESA_FORMAT_YCBCR_REV;
 196       }
 197    }
 198
 199 #if FEATURE_texture_fxt1
 200    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 201       switch (internalFormat) {
 202          case GL_COMPRESSED_RGB_FXT1_3DFX:
 203             return MESA_FORMAT_RGB_FXT1;
 204          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 205             return MESA_FORMAT_RGBA_FXT1;
 206          default:
 207             ; /* fallthrough */
 208       }
 209    }
 210 #endif
 211
 212 #if FEATURE_texture_s3tc
 213    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 214       switch (internalFormat) {
 215          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 216             return MESA_FORMAT_RGB_DXT1;
 217          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 218             return MESA_FORMAT_RGBA_DXT1;
 219          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 220             return MESA_FORMAT_RGBA_DXT3;
 221          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 222             return MESA_FORMAT_RGBA_DXT5;
 223          default:
 224             ; /* fallthrough */
 225       }
 226    }
 227
 228    if (ctx->Extensions.S3_s3tc) {
 229       switch (internalFormat) {
 230          case GL_RGB_S3TC:
 231          case GL_RGB4_S3TC:
 232             return MESA_FORMAT_RGB_DXT1;
 233          case GL_RGBA_S3TC:
 234          case GL_RGBA4_S3TC:
 235             return MESA_FORMAT_RGBA_DXT3;
 236          default:
 237             ; /* fallthrough */
 238       }
 239    }
 240 #endif
 241
 242    if (ctx->Extensions.ARB_texture_float) {
 243       switch (internalFormat) {
 244          case GL_ALPHA16F_ARB:
 245             return MESA_FORMAT_ALPHA_FLOAT16;
 246          case GL_ALPHA32F_ARB:
 247             return MESA_FORMAT_ALPHA_FLOAT32;
 248          case GL_LUMINANCE16F_ARB:
 249             return MESA_FORMAT_LUMINANCE_FLOAT16;
 250          case GL_LUMINANCE32F_ARB:
 251             return MESA_FORMAT_LUMINANCE_FLOAT32;
 252          case GL_LUMINANCE_ALPHA16F_ARB:
 253             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 254          case GL_LUMINANCE_ALPHA32F_ARB:
 255             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 256          case GL_INTENSITY16F_ARB:
 257             return MESA_FORMAT_INTENSITY_FLOAT16;
 258          case GL_INTENSITY32F_ARB:
 259             return MESA_FORMAT_INTENSITY_FLOAT32;
 260          case GL_RGB16F_ARB:
 261             return MESA_FORMAT_RGB_FLOAT16;
 262          case GL_RGB32F_ARB:
 263             return MESA_FORMAT_RGB_FLOAT32;
 264          case GL_RGBA16F_ARB:
 265             return MESA_FORMAT_RGBA_FLOAT16;
 266          case GL_RGBA32F_ARB:
 267             return MESA_FORMAT_RGBA_FLOAT32;
 268          default:
 269             ; /* fallthrough */
 270       }
 271    }
 272
 273    if (ctx->Extensions.EXT_packed_depth_stencil) {
 274       switch (internalFormat) {
 275          case GL_DEPTH_STENCIL_EXT:
 276          case GL_DEPTH24_STENCIL8_EXT:
 277             return MESA_FORMAT_Z24_S8;
 278          default:
 279             ; /* fallthrough */
 280       }
 281    }
 282
 283    if (ctx->Extensions.ATI_envmap_bumpmap) {
 284       switch (internalFormat) {
 285          case GL_DUDV_ATI:
 286          case GL_DU8DV8_ATI:
 287             return MESA_FORMAT_DUDV8;
 288          default:
 289             ; /* fallthrough */
 290       }
 291    }
 292
 293    if (ctx->Extensions.MESA_texture_signed_rgba) {
 294       switch (internalFormat) {
 295          case GL_RGBA_SNORM:
 296          case GL_RGBA8_SNORM:
 297             return MESA_FORMAT_SIGNED_RGBA8888;
 298          default:
 299             ; /* fallthrough */
 300       }
 301    }
 302
 303    if (ctx->VersionMajor * 10 + ctx->VersionMinor >= 31) {
 304       switch (internalFormat) {
 305          case GL_RED_SNORM:
 306          case GL_R8_SNORM:
 307             return MESA_FORMAT_SIGNED_R8;
 308          case GL_RG_SNORM:
 309          case GL_RG8_SNORM:
 310             return MESA_FORMAT_SIGNED_RG88;
 311          case GL_RGB_SNORM:
 312          case GL_RGB8_SNORM:
 313             return MESA_FORMAT_SIGNED_RGBX8888;
 314          case GL_RGBA_SNORM:
 315          case GL_RGBA8_SNORM:
 316             return MESA_FORMAT_SIGNED_RGBA8888;
 317          case GL_R16_SNORM:
 318             return MESA_FORMAT_SIGNED_R_16;
 319          case GL_RG16_SNORM:
 320             return MESA_FORMAT_SIGNED_RG_16;
 321          case GL_RGB16_SNORM:
 322             return MESA_FORMAT_SIGNED_RGB_16;
 323          case GL_RGBA16_SNORM:
 324             return MESA_FORMAT_SIGNED_RGBA_16;
 325          default:
 326             ; /* fall-through */
 327       }
 328    }
 329
 330 #if FEATURE_EXT_texture_sRGB
 331    if (ctx->Extensions.EXT_texture_sRGB) {
 332       switch (internalFormat) {
 333          case GL_SRGB_EXT:
 334          case GL_SRGB8_EXT:
 335             return MESA_FORMAT_SRGB8;
 336          case GL_SRGB_ALPHA_EXT:
 337          case GL_SRGB8_ALPHA8_EXT:
 338             return MESA_FORMAT_SRGBA8;
 339          case GL_SLUMINANCE_EXT:
 340          case GL_SLUMINANCE8_EXT:
 341             return MESA_FORMAT_SL8;
 342          case GL_SLUMINANCE_ALPHA_EXT:
 343          case GL_SLUMINANCE8_ALPHA8_EXT:
 344             return MESA_FORMAT_SLA8;
 345          case GL_COMPRESSED_SLUMINANCE_EXT:
 346             return MESA_FORMAT_SL8;
 347          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 348             return MESA_FORMAT_SLA8;
 349          case GL_COMPRESSED_SRGB_EXT:
 350 #if FEATURE_texture_s3tc
 351             if (ctx->Extensions.EXT_texture_compression_s3tc)
 352                return MESA_FORMAT_SRGB_DXT1;
 353 #endif
 354             return MESA_FORMAT_SRGB8;
 355          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 356 #if FEATURE_texture_s3tc
 357             if (ctx->Extensions.EXT_texture_compression_s3tc)
 358                return MESA_FORMAT_SRGBA_DXT3; /* Not srgba_dxt1, see spec */
 359 #endif
 360             return MESA_FORMAT_SRGBA8;
 361 #if FEATURE_texture_s3tc
 362          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 363             if (ctx->Extensions.EXT_texture_compression_s3tc)
 364                return MESA_FORMAT_SRGB_DXT1;
 365             break;
 366          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 367             if (ctx->Extensions.EXT_texture_compression_s3tc)
 368                return MESA_FORMAT_SRGBA_DXT1;
 369             break;
 370          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 371             if (ctx->Extensions.EXT_texture_compression_s3tc)
 372                return MESA_FORMAT_SRGBA_DXT3;
 373             break;
 374          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 375             if (ctx->Extensions.EXT_texture_compression_s3tc)
 376                return MESA_FORMAT_SRGBA_DXT5;
 377             break;
 378 #endif
 379          default:
 380             ; /* fallthrough */
 381       }
 382    }
 383 #endif /* FEATURE_EXT_texture_sRGB */
 384
 385    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 386    return MESA_FORMAT_NONE;
 387 }
 388