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       /* RGBA formats */
  65       case 4:
  66       case GL_RGBA:
  67       case GL_RGB10_A2:
  68       case GL_RGBA12:
  69       case GL_RGBA16:
  70       case GL_RGBA8:
  71          return MESA_FORMAT_RGBA8888;
  72       case GL_RGB5_A1:
  73          return MESA_FORMAT_ARGB1555;
  74       case GL_RGBA2:
  75          return MESA_FORMAT_ARGB4444_REV; /* just to test another format*/
  76       case GL_RGBA4:
  77          return MESA_FORMAT_ARGB4444;
  78
  79       /* RGB formats */
  80       case 3:
  81       case GL_RGB:
  82       case GL_RGB10:
  83       case GL_RGB12:
  84       case GL_RGB16:
  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       /* Alpha formats */
  95       case GL_ALPHA:
  96       case GL_ALPHA4:
  97       case GL_ALPHA12:
  98       case GL_ALPHA16:
  99       case GL_ALPHA8:
 100          return MESA_FORMAT_A8;
 101
 102       /* Luminance formats */
 103       case 1:
 104       case GL_LUMINANCE:
 105       case GL_LUMINANCE4:
 106       case GL_LUMINANCE12:
 107       case GL_LUMINANCE16:
 108       case GL_LUMINANCE8:
 109          return MESA_FORMAT_L8;
 110
 111       /* Luminance/Alpha formats */
 112       case 2:
 113       case GL_LUMINANCE_ALPHA:
 114       case GL_LUMINANCE4_ALPHA4:
 115       case GL_LUMINANCE6_ALPHA2:
 116       case GL_LUMINANCE8_ALPHA8:
 117          return MESA_FORMAT_AL88;
 118
 119       case GL_LUMINANCE12_ALPHA4:
 120       case GL_LUMINANCE12_ALPHA12:
 121       case GL_LUMINANCE16_ALPHA16:
 122          return MESA_FORMAT_AL1616;
 123
 124       case GL_INTENSITY:
 125       case GL_INTENSITY4:
 126       case GL_INTENSITY12:
 127       case GL_INTENSITY16:
 128       case GL_INTENSITY8:
 129          return MESA_FORMAT_I8;
 130
 131       case GL_COLOR_INDEX:
 132       case GL_COLOR_INDEX1_EXT:
 133       case GL_COLOR_INDEX2_EXT:
 134       case GL_COLOR_INDEX4_EXT:
 135       case GL_COLOR_INDEX12_EXT:
 136       case GL_COLOR_INDEX16_EXT:
 137       case GL_COLOR_INDEX8_EXT:
 138          return MESA_FORMAT_CI8;
 139
 140       default:
 141          ; /* fallthrough */
 142    }
 143
 144    if (ctx->Extensions.ARB_depth_texture) {
 145       switch (internalFormat) {
 146          case GL_DEPTH_COMPONENT:
 147          case GL_DEPTH_COMPONENT24:
 148          case GL_DEPTH_COMPONENT32:
 149             return MESA_FORMAT_Z32;
 150          case GL_DEPTH_COMPONENT16:
 151             return MESA_FORMAT_Z16;
 152          default:
 153             ; /* fallthrough */
 154       }
 155    }
 156
 157    switch (internalFormat) {
 158       case GL_COMPRESSED_ALPHA_ARB:
 159          return MESA_FORMAT_A8;
 160       case GL_COMPRESSED_LUMINANCE_ARB:
 161          return MESA_FORMAT_L8;
 162       case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
 163          return MESA_FORMAT_AL88;
 164       case GL_COMPRESSED_INTENSITY_ARB:
 165          return MESA_FORMAT_I8;
 166       case GL_COMPRESSED_RGB_ARB:
 167          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 168              ctx->Extensions.S3_s3tc)
 169             return MESA_FORMAT_RGB_DXT1;
 170          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 171             return MESA_FORMAT_RGB_FXT1;
 172          return MESA_FORMAT_RGB888;
 173       case GL_COMPRESSED_RGBA_ARB:
 174          if (ctx->Extensions.EXT_texture_compression_s3tc ||
 175              ctx->Extensions.S3_s3tc)
 176             return MESA_FORMAT_RGBA_DXT3; /* Not rgba_dxt1, see spec */
 177          if (ctx->Extensions.TDFX_texture_compression_FXT1)
 178             return MESA_FORMAT_RGBA_FXT1;
 179          return MESA_FORMAT_RGBA8888;
 180       default:
 181          ; /* fallthrough */
 182    }
 183
 184    if (ctx->Extensions.MESA_ycbcr_texture) {
 185       if (internalFormat == GL_YCBCR_MESA) {
 186          if (type == GL_UNSIGNED_SHORT_8_8_MESA)
 187             return MESA_FORMAT_YCBCR;
 188          else
 189             return MESA_FORMAT_YCBCR_REV;
 190       }
 191    }
 192
 193 #if FEATURE_texture_fxt1
 194    if (ctx->Extensions.TDFX_texture_compression_FXT1) {
 195       switch (internalFormat) {
 196          case GL_COMPRESSED_RGB_FXT1_3DFX:
 197             return MESA_FORMAT_RGB_FXT1;
 198          case GL_COMPRESSED_RGBA_FXT1_3DFX:
 199             return MESA_FORMAT_RGBA_FXT1;
 200          default:
 201             ; /* fallthrough */
 202       }
 203    }
 204 #endif
 205
 206 #if FEATURE_texture_s3tc
 207    if (ctx->Extensions.EXT_texture_compression_s3tc) {
 208       switch (internalFormat) {
 209          case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 210             return MESA_FORMAT_RGB_DXT1;
 211          case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 212             return MESA_FORMAT_RGBA_DXT1;
 213          case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 214             return MESA_FORMAT_RGBA_DXT3;
 215          case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 216             return MESA_FORMAT_RGBA_DXT5;
 217          default:
 218             ; /* fallthrough */
 219       }
 220    }
 221
 222    if (ctx->Extensions.S3_s3tc) {
 223       switch (internalFormat) {
 224          case GL_RGB_S3TC:
 225          case GL_RGB4_S3TC:
 226             return MESA_FORMAT_RGB_DXT1;
 227          case GL_RGBA_S3TC:
 228          case GL_RGBA4_S3TC:
 229             return MESA_FORMAT_RGBA_DXT3;
 230          default:
 231             ; /* fallthrough */
 232       }
 233    }
 234 #endif
 235
 236    if (ctx->Extensions.ARB_texture_float) {
 237       switch (internalFormat) {
 238          case GL_ALPHA16F_ARB:
 239             return MESA_FORMAT_ALPHA_FLOAT16;
 240          case GL_ALPHA32F_ARB:
 241             return MESA_FORMAT_ALPHA_FLOAT32;
 242          case GL_LUMINANCE16F_ARB:
 243             return MESA_FORMAT_LUMINANCE_FLOAT16;
 244          case GL_LUMINANCE32F_ARB:
 245             return MESA_FORMAT_LUMINANCE_FLOAT32;
 246          case GL_LUMINANCE_ALPHA16F_ARB:
 247             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 248          case GL_LUMINANCE_ALPHA32F_ARB:
 249             return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 250          case GL_INTENSITY16F_ARB:
 251             return MESA_FORMAT_INTENSITY_FLOAT16;
 252          case GL_INTENSITY32F_ARB:
 253             return MESA_FORMAT_INTENSITY_FLOAT32;
 254          case GL_RGB16F_ARB:
 255             return MESA_FORMAT_RGB_FLOAT16;
 256          case GL_RGB32F_ARB:
 257             return MESA_FORMAT_RGB_FLOAT32;
 258          case GL_RGBA16F_ARB:
 259             return MESA_FORMAT_RGBA_FLOAT16;
 260          case GL_RGBA32F_ARB:
 261             return MESA_FORMAT_RGBA_FLOAT32;
 262          default:
 263             ; /* fallthrough */
 264       }
 265    }
 266
 267    if (ctx->Extensions.EXT_packed_depth_stencil) {
 268       switch (internalFormat) {
 269          case GL_DEPTH_STENCIL_EXT:
 270          case GL_DEPTH24_STENCIL8_EXT:
 271             return MESA_FORMAT_Z24_S8;
 272          default:
 273             ; /* fallthrough */
 274       }
 275    }
 276
 277    if (ctx->Extensions.ATI_envmap_bumpmap) {
 278       switch (internalFormat) {
 279          case GL_DUDV_ATI:
 280          case GL_DU8DV8_ATI:
 281             return MESA_FORMAT_DUDV8;
 282          default:
 283             ; /* fallthrough */
 284       }
 285    }
 286
 287    if (ctx->Extensions.MESA_texture_signed_rgba) {
 288       switch (internalFormat) {
 289          case GL_RGBA_SNORM:
 290          case GL_RGBA8_SNORM:
 291             return MESA_FORMAT_SIGNED_RGBA8888;
 292          default:
 293             ; /* fallthrough */
 294       }
 295    }
 296
 297
 298 #if FEATURE_EXT_texture_sRGB
 299    if (ctx->Extensions.EXT_texture_sRGB) {
 300       switch (internalFormat) {
 301          case GL_SRGB_EXT:
 302          case GL_SRGB8_EXT:
 303             return MESA_FORMAT_SRGB8;
 304          case GL_SRGB_ALPHA_EXT:
 305          case GL_SRGB8_ALPHA8_EXT:
 306             return MESA_FORMAT_SRGBA8;
 307          case GL_SLUMINANCE_EXT:
 308          case GL_SLUMINANCE8_EXT:
 309             return MESA_FORMAT_SL8;
 310          case GL_SLUMINANCE_ALPHA_EXT:
 311          case GL_SLUMINANCE8_ALPHA8_EXT:
 312             return MESA_FORMAT_SLA8;
 313          case GL_COMPRESSED_SLUMINANCE_EXT:
 314             return MESA_FORMAT_SL8;
 315          case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 316             return MESA_FORMAT_SLA8;
 317          case GL_COMPRESSED_SRGB_EXT:
 318 #if FEATURE_texture_s3tc
 319             if (ctx->Extensions.EXT_texture_compression_s3tc)
 320                return MESA_FORMAT_SRGB_DXT1;
 321 #endif
 322             return MESA_FORMAT_SRGB8;
 323          case GL_COMPRESSED_SRGB_ALPHA_EXT:
 324 #if FEATURE_texture_s3tc
 325             if (ctx->Extensions.EXT_texture_compression_s3tc)
 326                return MESA_FORMAT_SRGBA_DXT3; /* Not srgba_dxt1, see spec */
 327 #endif
 328             return MESA_FORMAT_SRGBA8;
 329 #if FEATURE_texture_s3tc
 330          case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 331             if (ctx->Extensions.EXT_texture_compression_s3tc)
 332                return MESA_FORMAT_SRGB_DXT1;
 333             break;
 334          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 335             if (ctx->Extensions.EXT_texture_compression_s3tc)
 336                return MESA_FORMAT_SRGBA_DXT1;
 337             break;
 338          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 339             if (ctx->Extensions.EXT_texture_compression_s3tc)
 340                return MESA_FORMAT_SRGBA_DXT3;
 341             break;
 342          case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 343             if (ctx->Extensions.EXT_texture_compression_s3tc)
 344                return MESA_FORMAT_SRGBA_DXT5;
 345             break;
 346 #endif
 347          default:
 348             ; /* fallthrough */
 349       }
 350    }
 351 #endif /* FEATURE_EXT_texture_sRGB */
 352
 353    _mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
 354    return MESA_FORMAT_NONE;
 355 }
 356