src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008-2010 VMware, Inc.
   5  * 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
   9  * "Software"), to deal in the Software without restriction, including
  10  * without limitation the rights to use, copy, modify, merge, publish,
  11  * distribute, sub license, and/or sell copies of the Software, and to
  12  * permit persons to whom the Software is furnished to do so, subject to
  13  * the following conditions:
  14  *
  15  * The above copyright notice and this permission notice (including the
  16  * next paragraph) shall be included in all copies or substantial portions
  17  * of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  21  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  22  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  23  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  24  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  25  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  26  *
  27  **************************************************************************/
  28
  29
  30 /**
  31  * Mesa / Gallium format conversion and format selection code.
  32  * \author Brian Paul
  33  */
  34
  35 #include "main/imports.h"
  36 #include "main/context.h"
  37 #include "main/texstore.h"
  38 #include "main/image.h"
  39 #include "main/macros.h"
  40 #include "main/mfeatures.h"
  41
  42 #include "pipe/p_context.h"
  43 #include "pipe/p_defines.h"
  44 #include "pipe/p_screen.h"
  45 #include "util/u_format.h"
  46 #include "st_context.h"
  47 #include "st_format.h"
  48
  49
  50 static GLuint
  51 format_max_bits(enum pipe_format format)
  52 {
  53    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  54
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  59    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  60    return size;
  61 }
  62
  63
  64 /**
  65  * Return basic GL datatype for the given gallium format.
  66  */
  67 GLenum
  68 st_format_datatype(enum pipe_format format)
  69 {
  70    const struct util_format_description *desc;
  71
  72    desc = util_format_description(format);
  73    assert(desc);
  74
  75    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  76       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  77           format == PIPE_FORMAT_B5G6R5_UNORM) {
  78          return GL_UNSIGNED_SHORT;
  79       }
  80       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  81                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
  82                format == PIPE_FORMAT_Z24X8_UNORM ||
  83                format == PIPE_FORMAT_X8Z24_UNORM) {
  84          return GL_UNSIGNED_INT_24_8;
  85       }
  86       else {
  87          const GLuint size = format_max_bits(format);
  88          if (size == 8) {
  89             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  90                return GL_UNSIGNED_BYTE;
  91             else
  92                return GL_BYTE;
  93          }
  94          else if (size == 16) {
  95             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  96                return GL_UNSIGNED_SHORT;
  97             else
  98                return GL_SHORT;
  99          }
 100          else {
 101             assert( size <= 32 );
 102             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 103                return GL_UNSIGNED_INT;
 104             else
 105                return GL_INT;
 106          }
 107       }
 108    }
 109    else if (format == PIPE_FORMAT_UYVY) {
 110       return GL_UNSIGNED_SHORT;
 111    }
 112    else if (format == PIPE_FORMAT_YUYV) {
 113       return GL_UNSIGNED_SHORT;
 114    }
 115    else {
 116       /* probably a compressed format, unsupported anyway */
 117       return GL_NONE;
 118    }
 119 }
 120
 121
 122 /**
 123  * Translate Mesa format to Gallium format.
 124  */
 125 enum pipe_format
 126 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 127 {
 128    switch (mesaFormat) {
 129    case MESA_FORMAT_RGBA8888:
 130       return PIPE_FORMAT_A8B8G8R8_UNORM;
 131    case MESA_FORMAT_RGBA8888_REV:
 132       return PIPE_FORMAT_R8G8B8A8_UNORM;
 133    case MESA_FORMAT_ARGB8888:
 134       return PIPE_FORMAT_B8G8R8A8_UNORM;
 135    case MESA_FORMAT_ARGB8888_REV:
 136       return PIPE_FORMAT_A8R8G8B8_UNORM;
 137    case MESA_FORMAT_XRGB8888:
 138       return PIPE_FORMAT_B8G8R8X8_UNORM;
 139    case MESA_FORMAT_XRGB8888_REV:
 140       return PIPE_FORMAT_X8R8G8B8_UNORM;
 141    case MESA_FORMAT_ARGB1555:
 142       return PIPE_FORMAT_B5G5R5A1_UNORM;
 143    case MESA_FORMAT_ARGB4444:
 144       return PIPE_FORMAT_B4G4R4A4_UNORM;
 145    case MESA_FORMAT_RGB565:
 146       return PIPE_FORMAT_B5G6R5_UNORM;
 147    case MESA_FORMAT_RGB332:
 148       return PIPE_FORMAT_B2G3R3_UNORM;
 149    case MESA_FORMAT_ARGB2101010:
 150       return PIPE_FORMAT_B10G10R10A2_UNORM;
 151    case MESA_FORMAT_AL44:
 152       return PIPE_FORMAT_L4A4_UNORM;
 153    case MESA_FORMAT_AL88:
 154       return PIPE_FORMAT_L8A8_UNORM;
 155    case MESA_FORMAT_AL1616:
 156       return PIPE_FORMAT_L16A16_UNORM;
 157    case MESA_FORMAT_A8:
 158       return PIPE_FORMAT_A8_UNORM;
 159    case MESA_FORMAT_A16:
 160       return PIPE_FORMAT_A16_UNORM;
 161    case MESA_FORMAT_L8:
 162       return PIPE_FORMAT_L8_UNORM;
 163    case MESA_FORMAT_L16:
 164       return PIPE_FORMAT_L16_UNORM;
 165    case MESA_FORMAT_I8:
 166       return PIPE_FORMAT_I8_UNORM;
 167    case MESA_FORMAT_I16:
 168       return PIPE_FORMAT_I16_UNORM;
 169    case MESA_FORMAT_Z16:
 170       return PIPE_FORMAT_Z16_UNORM;
 171    case MESA_FORMAT_Z32:
 172       return PIPE_FORMAT_Z32_UNORM;
 173    case MESA_FORMAT_Z24_S8:
 174       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 175    case MESA_FORMAT_S8_Z24:
 176       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 177    case MESA_FORMAT_Z24_X8:
 178       return PIPE_FORMAT_X8Z24_UNORM;
 179    case MESA_FORMAT_X8_Z24:
 180       return PIPE_FORMAT_Z24X8_UNORM;
 181    case MESA_FORMAT_S8:
 182       return PIPE_FORMAT_S8_USCALED;
 183    case MESA_FORMAT_YCBCR:
 184       return PIPE_FORMAT_UYVY;
 185 #if FEATURE_texture_s3tc
 186    case MESA_FORMAT_RGB_DXT1:
 187       return PIPE_FORMAT_DXT1_RGB;
 188    case MESA_FORMAT_RGBA_DXT1:
 189       return PIPE_FORMAT_DXT1_RGBA;
 190    case MESA_FORMAT_RGBA_DXT3:
 191       return PIPE_FORMAT_DXT3_RGBA;
 192    case MESA_FORMAT_RGBA_DXT5:
 193       return PIPE_FORMAT_DXT5_RGBA;
 194 #if FEATURE_EXT_texture_sRGB
 195    case MESA_FORMAT_SRGB_DXT1:
 196       return PIPE_FORMAT_DXT1_SRGB;
 197    case MESA_FORMAT_SRGBA_DXT1:
 198       return PIPE_FORMAT_DXT1_SRGBA;
 199    case MESA_FORMAT_SRGBA_DXT3:
 200       return PIPE_FORMAT_DXT3_SRGBA;
 201    case MESA_FORMAT_SRGBA_DXT5:
 202       return PIPE_FORMAT_DXT5_SRGBA;
 203 #endif
 204 #endif
 205 #if FEATURE_EXT_texture_sRGB
 206    case MESA_FORMAT_SLA8:
 207       return PIPE_FORMAT_L8A8_SRGB;
 208    case MESA_FORMAT_SL8:
 209       return PIPE_FORMAT_L8_SRGB;
 210    case MESA_FORMAT_SRGB8:
 211       return PIPE_FORMAT_R8G8B8_SRGB;
 212    case MESA_FORMAT_SRGBA8:
 213       return PIPE_FORMAT_A8B8G8R8_SRGB;
 214    case MESA_FORMAT_SARGB8:
 215       return PIPE_FORMAT_B8G8R8A8_SRGB;
 216 #endif
 217    case MESA_FORMAT_RGBA_FLOAT32:
 218       return PIPE_FORMAT_R32G32B32A32_FLOAT;
 219    case MESA_FORMAT_RGBA_FLOAT16:
 220       return PIPE_FORMAT_R16G16B16A16_FLOAT;
 221    case MESA_FORMAT_RGB_FLOAT32:
 222       return PIPE_FORMAT_R32G32B32_FLOAT;
 223    case MESA_FORMAT_RGB_FLOAT16:
 224       return PIPE_FORMAT_R16G16B16_FLOAT;
 225    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32:
 226       return PIPE_FORMAT_L32A32_FLOAT;
 227    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16:
 228       return PIPE_FORMAT_L16A16_FLOAT;
 229    case MESA_FORMAT_LUMINANCE_FLOAT32:
 230       return PIPE_FORMAT_L32_FLOAT;
 231    case MESA_FORMAT_LUMINANCE_FLOAT16:
 232       return PIPE_FORMAT_L16_FLOAT;
 233    case MESA_FORMAT_ALPHA_FLOAT32:
 234       return PIPE_FORMAT_A32_FLOAT;
 235    case MESA_FORMAT_ALPHA_FLOAT16:
 236       return PIPE_FORMAT_A16_FLOAT;
 237    case MESA_FORMAT_INTENSITY_FLOAT32:
 238       return PIPE_FORMAT_I32_FLOAT;
 239    case MESA_FORMAT_INTENSITY_FLOAT16:
 240       return PIPE_FORMAT_I16_FLOAT;
 241    case MESA_FORMAT_R_FLOAT32:
 242       return PIPE_FORMAT_R32_FLOAT;
 243    case MESA_FORMAT_R_FLOAT16:
 244       return PIPE_FORMAT_R16_FLOAT;
 245    case MESA_FORMAT_RG_FLOAT32:
 246       return PIPE_FORMAT_R32G32_FLOAT;
 247    case MESA_FORMAT_RG_FLOAT16:
 248       return PIPE_FORMAT_R16G16_FLOAT;
 249
 250    case MESA_FORMAT_R8:
 251       return PIPE_FORMAT_R8_UNORM;
 252    case MESA_FORMAT_R16:
 253       return PIPE_FORMAT_R16_UNORM;
 254    case MESA_FORMAT_RG88:
 255       return PIPE_FORMAT_R8G8_UNORM;
 256    case MESA_FORMAT_RG1616:
 257       return PIPE_FORMAT_R16G16_UNORM;
 258    case MESA_FORMAT_RGBA_16:
 259       return PIPE_FORMAT_R16G16B16A16_UNORM;
 260
 261    /* signed int formats */
 262    case MESA_FORMAT_RGBA_INT8:
 263       return PIPE_FORMAT_R8G8B8A8_SSCALED;
 264    case MESA_FORMAT_RGBA_INT16:
 265       return PIPE_FORMAT_R16G16B16A16_SSCALED;
 266    case MESA_FORMAT_RGBA_INT32:
 267       return PIPE_FORMAT_R32G32B32A32_SSCALED;
 268
 269    /* unsigned int formats */
 270    case MESA_FORMAT_RGBA_UINT8:
 271       return PIPE_FORMAT_R8G8B8A8_USCALED;
 272    case MESA_FORMAT_RGBA_UINT16:
 273       return PIPE_FORMAT_R16G16B16A16_USCALED;
 274    case MESA_FORMAT_RGBA_UINT32:
 275       return PIPE_FORMAT_R32G32B32A32_USCALED;
 276
 277    case MESA_FORMAT_RED_RGTC1:
 278       return PIPE_FORMAT_RGTC1_UNORM;
 279    case MESA_FORMAT_SIGNED_RED_RGTC1:
 280       return PIPE_FORMAT_RGTC1_SNORM;
 281    case MESA_FORMAT_RG_RGTC2:
 282       return PIPE_FORMAT_RGTC2_UNORM;
 283    case MESA_FORMAT_SIGNED_RG_RGTC2:
 284       return PIPE_FORMAT_RGTC2_SNORM;
 285
 286    case MESA_FORMAT_L_LATC1:
 287       return PIPE_FORMAT_LATC1_UNORM;
 288    case MESA_FORMAT_SIGNED_L_LATC1:
 289       return PIPE_FORMAT_LATC1_SNORM;
 290    case MESA_FORMAT_LA_LATC2:
 291       return PIPE_FORMAT_LATC2_UNORM;
 292    case MESA_FORMAT_SIGNED_LA_LATC2:
 293       return PIPE_FORMAT_LATC2_SNORM;
 294
 295    /* signed normalized formats */
 296    case MESA_FORMAT_SIGNED_R8:
 297       return PIPE_FORMAT_R8_SNORM;
 298    case MESA_FORMAT_SIGNED_RG88_REV:
 299       return PIPE_FORMAT_R8G8_SNORM;
 300    case MESA_FORMAT_SIGNED_RGBA8888_REV:
 301       return PIPE_FORMAT_R8G8B8A8_SNORM;
 302
 303    case MESA_FORMAT_SIGNED_A8:
 304       return PIPE_FORMAT_A8_SNORM;
 305    case MESA_FORMAT_SIGNED_L8:
 306       return PIPE_FORMAT_L8_SNORM;
 307    case MESA_FORMAT_SIGNED_AL88:
 308       return PIPE_FORMAT_L8A8_SNORM;
 309    case MESA_FORMAT_SIGNED_I8:
 310       return PIPE_FORMAT_I8_SNORM;
 311
 312    case MESA_FORMAT_SIGNED_R16:
 313       return PIPE_FORMAT_R16_SNORM;
 314    case MESA_FORMAT_SIGNED_GR1616:
 315       return PIPE_FORMAT_R16G16_SNORM;
 316    case MESA_FORMAT_SIGNED_RGBA_16:
 317       return PIPE_FORMAT_R16G16B16A16_SNORM;
 318
 319    case MESA_FORMAT_SIGNED_A16:
 320       return PIPE_FORMAT_A16_SNORM;
 321    case MESA_FORMAT_SIGNED_L16:
 322       return PIPE_FORMAT_L16_SNORM;
 323    case MESA_FORMAT_SIGNED_AL1616:
 324       return PIPE_FORMAT_L16A16_SNORM;
 325    case MESA_FORMAT_SIGNED_I16:
 326       return PIPE_FORMAT_I16_SNORM;
 327
 328    case MESA_FORMAT_RGB9_E5_FLOAT:
 329       return PIPE_FORMAT_R9G9B9E5_FLOAT;
 330    case MESA_FORMAT_R11_G11_B10_FLOAT:
 331       return PIPE_FORMAT_R11G11B10_FLOAT;
 332
 333    default:
 334       assert(0);
 335       return PIPE_FORMAT_NONE;
 336    }
 337 }
 338
 339
 340 /**
 341  * Translate Gallium format to Mesa format.
 342  */
 343 gl_format
 344 st_pipe_format_to_mesa_format(enum pipe_format format)
 345 {
 346    switch (format) {
 347    case PIPE_FORMAT_A8B8G8R8_UNORM:
 348       return MESA_FORMAT_RGBA8888;
 349    case PIPE_FORMAT_R8G8B8A8_UNORM:
 350       return MESA_FORMAT_RGBA8888_REV;
 351    case PIPE_FORMAT_B8G8R8A8_UNORM:
 352       return MESA_FORMAT_ARGB8888;
 353    case PIPE_FORMAT_A8R8G8B8_UNORM:
 354       return MESA_FORMAT_ARGB8888_REV;
 355    case PIPE_FORMAT_B8G8R8X8_UNORM:
 356       return MESA_FORMAT_XRGB8888;
 357    case PIPE_FORMAT_X8R8G8B8_UNORM:
 358       return MESA_FORMAT_XRGB8888_REV;
 359    case PIPE_FORMAT_B5G5R5A1_UNORM:
 360       return MESA_FORMAT_ARGB1555;
 361    case PIPE_FORMAT_B4G4R4A4_UNORM:
 362       return MESA_FORMAT_ARGB4444;
 363    case PIPE_FORMAT_B5G6R5_UNORM:
 364       return MESA_FORMAT_RGB565;
 365    case PIPE_FORMAT_B2G3R3_UNORM:
 366       return MESA_FORMAT_RGB332;
 367    case PIPE_FORMAT_B10G10R10A2_UNORM:
 368       return MESA_FORMAT_ARGB2101010;
 369    case PIPE_FORMAT_L4A4_UNORM:
 370       return MESA_FORMAT_AL44;
 371    case PIPE_FORMAT_L8A8_UNORM:
 372       return MESA_FORMAT_AL88;
 373    case PIPE_FORMAT_L16A16_UNORM:
 374       return MESA_FORMAT_AL1616;
 375    case PIPE_FORMAT_A8_UNORM:
 376       return MESA_FORMAT_A8;
 377    case PIPE_FORMAT_A16_UNORM:
 378       return MESA_FORMAT_A16;
 379    case PIPE_FORMAT_L8_UNORM:
 380       return MESA_FORMAT_L8;
 381    case PIPE_FORMAT_L16_UNORM:
 382       return MESA_FORMAT_L16;
 383    case PIPE_FORMAT_I8_UNORM:
 384       return MESA_FORMAT_I8;
 385    case PIPE_FORMAT_I16_UNORM:
 386       return MESA_FORMAT_I16;
 387    case PIPE_FORMAT_S8_USCALED:
 388       return MESA_FORMAT_S8;
 389
 390    case PIPE_FORMAT_R16G16B16A16_UNORM:
 391       return MESA_FORMAT_RGBA_16;
 392
 393    case PIPE_FORMAT_Z16_UNORM:
 394       return MESA_FORMAT_Z16;
 395    case PIPE_FORMAT_Z32_UNORM:
 396       return MESA_FORMAT_Z32;
 397    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 398       return MESA_FORMAT_Z24_S8;
 399    case PIPE_FORMAT_X8Z24_UNORM:
 400       return MESA_FORMAT_Z24_X8;
 401    case PIPE_FORMAT_Z24X8_UNORM:
 402       return MESA_FORMAT_X8_Z24;
 403    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 404       return MESA_FORMAT_S8_Z24;
 405
 406    case PIPE_FORMAT_UYVY:
 407       return MESA_FORMAT_YCBCR;
 408    case PIPE_FORMAT_YUYV:
 409       return MESA_FORMAT_YCBCR_REV;
 410
 411 #if FEATURE_texture_s3tc
 412    case PIPE_FORMAT_DXT1_RGB:
 413       return MESA_FORMAT_RGB_DXT1;
 414    case PIPE_FORMAT_DXT1_RGBA:
 415       return MESA_FORMAT_RGBA_DXT1;
 416    case PIPE_FORMAT_DXT3_RGBA:
 417       return MESA_FORMAT_RGBA_DXT3;
 418    case PIPE_FORMAT_DXT5_RGBA:
 419       return MESA_FORMAT_RGBA_DXT5;
 420 #if FEATURE_EXT_texture_sRGB
 421    case PIPE_FORMAT_DXT1_SRGB:
 422       return MESA_FORMAT_SRGB_DXT1;
 423    case PIPE_FORMAT_DXT1_SRGBA:
 424       return MESA_FORMAT_SRGBA_DXT1;
 425    case PIPE_FORMAT_DXT3_SRGBA:
 426       return MESA_FORMAT_SRGBA_DXT3;
 427    case PIPE_FORMAT_DXT5_SRGBA:
 428       return MESA_FORMAT_SRGBA_DXT5;
 429 #endif
 430 #endif
 431
 432 #if FEATURE_EXT_texture_sRGB
 433    case PIPE_FORMAT_L8A8_SRGB:
 434       return MESA_FORMAT_SLA8;
 435    case PIPE_FORMAT_L8_SRGB:
 436       return MESA_FORMAT_SL8;
 437    case PIPE_FORMAT_R8G8B8_SRGB:
 438       return MESA_FORMAT_SRGB8;
 439    case PIPE_FORMAT_A8B8G8R8_SRGB:
 440       return MESA_FORMAT_SRGBA8;
 441    case PIPE_FORMAT_B8G8R8A8_SRGB:
 442       return MESA_FORMAT_SARGB8;
 443 #endif
 444    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 445       return MESA_FORMAT_RGBA_FLOAT32;
 446    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 447       return MESA_FORMAT_RGBA_FLOAT16;
 448    case PIPE_FORMAT_R32G32B32_FLOAT:
 449       return MESA_FORMAT_RGB_FLOAT32;
 450    case PIPE_FORMAT_R16G16B16_FLOAT:
 451       return MESA_FORMAT_RGB_FLOAT16;
 452    case PIPE_FORMAT_L32A32_FLOAT:
 453       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 454    case PIPE_FORMAT_L16A16_FLOAT:
 455       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 456    case PIPE_FORMAT_L32_FLOAT:
 457       return MESA_FORMAT_LUMINANCE_FLOAT32;
 458    case PIPE_FORMAT_L16_FLOAT:
 459       return MESA_FORMAT_LUMINANCE_FLOAT16;
 460    case PIPE_FORMAT_A32_FLOAT:
 461       return MESA_FORMAT_ALPHA_FLOAT32;
 462    case PIPE_FORMAT_A16_FLOAT:
 463       return MESA_FORMAT_ALPHA_FLOAT16;
 464    case PIPE_FORMAT_I32_FLOAT:
 465       return MESA_FORMAT_INTENSITY_FLOAT32;
 466    case PIPE_FORMAT_I16_FLOAT:
 467       return MESA_FORMAT_INTENSITY_FLOAT16;
 468    case PIPE_FORMAT_R32_FLOAT:
 469       return MESA_FORMAT_R_FLOAT32;
 470    case PIPE_FORMAT_R16_FLOAT:
 471       return MESA_FORMAT_R_FLOAT16;
 472    case PIPE_FORMAT_R32G32_FLOAT:
 473       return MESA_FORMAT_RG_FLOAT32;
 474    case PIPE_FORMAT_R16G16_FLOAT:
 475       return MESA_FORMAT_RG_FLOAT16;
 476
 477    case PIPE_FORMAT_R8_UNORM:
 478       return MESA_FORMAT_R8;
 479    case PIPE_FORMAT_R16_UNORM:
 480       return MESA_FORMAT_R16;
 481    case PIPE_FORMAT_R8G8_UNORM:
 482       return MESA_FORMAT_RG88;
 483    case PIPE_FORMAT_R16G16_UNORM:
 484       return MESA_FORMAT_RG1616;
 485
 486    /* signed int formats */
 487    case PIPE_FORMAT_R8G8B8A8_SSCALED:
 488       return MESA_FORMAT_RGBA_INT8;
 489    case PIPE_FORMAT_R16G16B16A16_SSCALED:
 490       return MESA_FORMAT_RGBA_INT16;
 491    case PIPE_FORMAT_R32G32B32A32_SSCALED:
 492       return MESA_FORMAT_RGBA_INT32;
 493
 494    /* unsigned int formats */
 495    case PIPE_FORMAT_R8G8B8A8_USCALED:
 496       return MESA_FORMAT_RGBA_UINT8;
 497    case PIPE_FORMAT_R16G16B16A16_USCALED:
 498       return MESA_FORMAT_RGBA_UINT16;
 499    case PIPE_FORMAT_R32G32B32A32_USCALED:
 500       return MESA_FORMAT_RGBA_UINT32;
 501
 502    case PIPE_FORMAT_RGTC1_UNORM:
 503       return MESA_FORMAT_RED_RGTC1;
 504    case PIPE_FORMAT_RGTC1_SNORM:
 505       return MESA_FORMAT_SIGNED_RED_RGTC1;
 506    case PIPE_FORMAT_RGTC2_UNORM:
 507       return MESA_FORMAT_RG_RGTC2;
 508    case PIPE_FORMAT_RGTC2_SNORM:
 509       return MESA_FORMAT_SIGNED_RG_RGTC2;
 510
 511    case PIPE_FORMAT_LATC1_UNORM:
 512       return MESA_FORMAT_L_LATC1;
 513    case PIPE_FORMAT_LATC1_SNORM:
 514       return MESA_FORMAT_SIGNED_L_LATC1;
 515    case PIPE_FORMAT_LATC2_UNORM:
 516       return MESA_FORMAT_LA_LATC2;
 517    case PIPE_FORMAT_LATC2_SNORM:
 518       return MESA_FORMAT_SIGNED_LA_LATC2;
 519
 520    /* signed normalized formats */
 521    case PIPE_FORMAT_R8_SNORM:
 522       return MESA_FORMAT_SIGNED_R8;
 523    case PIPE_FORMAT_R8G8_SNORM:
 524       return MESA_FORMAT_SIGNED_RG88_REV;
 525    case PIPE_FORMAT_R8G8B8A8_SNORM:
 526       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 527
 528    case PIPE_FORMAT_A8_SNORM:
 529       return MESA_FORMAT_SIGNED_A8;
 530    case PIPE_FORMAT_L8_SNORM:
 531       return MESA_FORMAT_SIGNED_L8;
 532    case PIPE_FORMAT_L8A8_SNORM:
 533       return MESA_FORMAT_SIGNED_AL88;
 534    case PIPE_FORMAT_I8_SNORM:
 535       return MESA_FORMAT_SIGNED_I8;
 536
 537    case PIPE_FORMAT_R16_SNORM:
 538       return MESA_FORMAT_SIGNED_R16;
 539    case PIPE_FORMAT_R16G16_SNORM:
 540       return MESA_FORMAT_SIGNED_GR1616;
 541    case PIPE_FORMAT_R16G16B16A16_SNORM:
 542       return MESA_FORMAT_SIGNED_RGBA_16;
 543
 544    case PIPE_FORMAT_A16_SNORM:
 545       return MESA_FORMAT_SIGNED_A16;
 546    case PIPE_FORMAT_L16_SNORM:
 547       return MESA_FORMAT_SIGNED_L16;
 548    case PIPE_FORMAT_L16A16_SNORM:
 549       return MESA_FORMAT_SIGNED_AL1616;
 550    case PIPE_FORMAT_I16_SNORM:
 551       return MESA_FORMAT_SIGNED_I16;
 552
 553    case PIPE_FORMAT_R9G9B9E5_FLOAT:
 554       return MESA_FORMAT_RGB9_E5_FLOAT;
 555    case PIPE_FORMAT_R11G11B10_FLOAT:
 556       return MESA_FORMAT_R11_G11_B10_FLOAT;
 557
 558    default:
 559       assert(0);
 560       return MESA_FORMAT_NONE;
 561    }
 562 }
 563
 564
 565 /**
 566  * Map GL texture formats to Gallium pipe formats.
 567  */
 568 struct format_mapping
 569 {
 570    GLenum glFormats[18];       /**< list of GLenum formats, 0-terminated */
 571    enum pipe_format pipeFormats[10]; /**< list of pipe formats, 0-terminated */
 572 };
 573
 574
 575 #define DEFAULT_RGBA_FORMATS \
 576       PIPE_FORMAT_B8G8R8A8_UNORM, \
 577       PIPE_FORMAT_A8R8G8B8_UNORM, \
 578       PIPE_FORMAT_A8B8G8R8_UNORM, \
 579       PIPE_FORMAT_B5G6R5_UNORM, \
 580       0
 581
 582 #define DEFAULT_RGB_FORMATS \
 583       PIPE_FORMAT_B8G8R8X8_UNORM, \
 584       PIPE_FORMAT_X8R8G8B8_UNORM, \
 585       PIPE_FORMAT_X8B8G8R8_UNORM, \
 586       PIPE_FORMAT_B8G8R8A8_UNORM, \
 587       PIPE_FORMAT_A8R8G8B8_UNORM, \
 588       PIPE_FORMAT_A8B8G8R8_UNORM, \
 589       PIPE_FORMAT_B5G6R5_UNORM, \
 590       0
 591
 592 #define DEFAULT_SRGBA_FORMATS \
 593       PIPE_FORMAT_B8G8R8A8_SRGB, \
 594       PIPE_FORMAT_A8R8G8B8_SRGB, \
 595       PIPE_FORMAT_A8B8G8R8_SRGB, \
 596       0
 597
 598 /**
 599  * This table maps OpenGL texture format enums to Gallium pipe_format enums.
 600  * Multiple GL enums might map to multiple pipe_formats.
 601  * The first pipe format in the list that's supported is the one that's chosen.
 602  */
 603 static struct format_mapping format_map[] = {
 604    /* Basic RGB, RGBA formats */
 605    {
 606       { GL_RGB10, GL_RGB10_A2, 0 },
 607       { PIPE_FORMAT_B10G10R10A2_UNORM, 0 }
 608    },
 609    {
 610       { 4, GL_RGBA, GL_RGBA8, 0 },
 611       { DEFAULT_RGBA_FORMATS, 0 }
 612    },
 613    {
 614       { GL_BGRA, 0 },
 615       { PIPE_FORMAT_B8G8R8A8_UNORM, DEFAULT_RGB_FORMATS, 0 }
 616    },
 617    {
 618       { 3, GL_RGB, GL_RGB8, 0 },
 619       { DEFAULT_RGB_FORMATS, 0 }
 620    },
 621    {
 622       { GL_RGB12, GL_RGB16, GL_RGBA12, GL_RGBA16, 0 },
 623       { PIPE_FORMAT_R16G16B16A16_UNORM, DEFAULT_RGB_FORMATS, 0 }
 624    },
 625    {
 626       { GL_RGBA4, GL_RGBA2, 0 },
 627       { PIPE_FORMAT_B4G4R4A4_UNORM, DEFAULT_RGBA_FORMATS }
 628    },
 629    {
 630       { GL_RGB5_A1, 0 },
 631       { PIPE_FORMAT_B5G5R5A1_UNORM, DEFAULT_RGBA_FORMATS, 0 }
 632    },
 633    {
 634       { GL_R3_G3_B2, 0 },
 635       { PIPE_FORMAT_B2G3R3_UNORM, PIPE_FORMAT_B5G6R5_UNORM,
 636         PIPE_FORMAT_B5G5R5A1_UNORM, DEFAULT_RGBA_FORMATS }
 637    },
 638    {
 639       { GL_RGB5, GL_RGB4 },
 640       { PIPE_FORMAT_B5G6R5_UNORM, PIPE_FORMAT_B5G5R5A1_UNORM,
 641         DEFAULT_RGBA_FORMATS }
 642    },
 643
 644    /* basic Alpha formats */
 645    {
 646       { GL_ALPHA12, GL_ALPHA16, 0 },
 647       { PIPE_FORMAT_A16_UNORM, PIPE_FORMAT_A8_UNORM,
 648         DEFAULT_RGBA_FORMATS }
 649    },
 650    {
 651       { GL_ALPHA, GL_ALPHA4, GL_ALPHA8, GL_COMPRESSED_ALPHA, 0 },
 652       { PIPE_FORMAT_A8_UNORM, DEFAULT_RGBA_FORMATS }
 653    },
 654
 655    /* basic Luminance formats */
 656    {
 657       { GL_LUMINANCE12, GL_LUMINANCE16, 0 },
 658       { PIPE_FORMAT_L16_UNORM, PIPE_FORMAT_L8_UNORM, DEFAULT_RGBA_FORMATS, 0 }
 659    },
 660    {
 661       { 1, GL_LUMINANCE, GL_LUMINANCE4, GL_LUMINANCE8, 0 },
 662       { PIPE_FORMAT_L8_UNORM, DEFAULT_RGBA_FORMATS }
 663    },
 664
 665    /* basic Luminance/Alpha formats */
 666    {
 667       { GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,
 668         GL_LUMINANCE16_ALPHA16, 0},
 669       { PIPE_FORMAT_L16A16_UNORM, PIPE_FORMAT_L8A8_UNORM,
 670         PIPE_FORMAT_L8A8_UNORM, DEFAULT_RGBA_FORMATS }
 671    },
 672    {
 673       { 2, GL_LUMINANCE_ALPHA, GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8, 0 },
 674       { PIPE_FORMAT_L8A8_UNORM, DEFAULT_RGBA_FORMATS }
 675    },
 676    {
 677       { GL_LUMINANCE4_ALPHA4, 0 },
 678       { PIPE_FORMAT_L4A4_UNORM, PIPE_FORMAT_L4A4_UNORM,
 679         DEFAULT_RGBA_FORMATS }
 680    },
 681
 682    /* basic Intensity formats */
 683    {
 684       { GL_INTENSITY12, GL_INTENSITY16, 0 },
 685       { PIPE_FORMAT_I16_UNORM, PIPE_FORMAT_I8_UNORM, DEFAULT_RGBA_FORMATS }
 686    },
 687    {
 688       { GL_INTENSITY, GL_INTENSITY4, GL_INTENSITY8,
 689         GL_COMPRESSED_INTENSITY, 0 },
 690       { PIPE_FORMAT_I8_UNORM, DEFAULT_RGBA_FORMATS }
 691    },
 692
 693    /* YCbCr */
 694    {
 695       { GL_YCBCR_MESA, 0 },
 696       { PIPE_FORMAT_UYVY, PIPE_FORMAT_YUYV, 0 }
 697    },
 698
 699    /* compressed formats */ /* XXX PIPE_BIND_SAMPLER_VIEW only */
 700    {
 701       { GL_COMPRESSED_RGB, 0 },
 702       { PIPE_FORMAT_DXT1_RGB, 0 }
 703    },
 704    {
 705       { GL_COMPRESSED_RGBA, 0 },
 706       { PIPE_FORMAT_DXT5_RGBA, 0 }
 707    },
 708    {
 709       { GL_RGB_S3TC, GL_RGB4_S3TC, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, 0 },
 710       { PIPE_FORMAT_DXT1_RGB, 0 }
 711    },
 712    {
 713       { GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 0 },
 714       { PIPE_FORMAT_DXT1_RGBA, 0 }
 715    },
 716    {
 717       { GL_RGBA_S3TC, GL_RGBA4_S3TC, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, 0 },
 718       { PIPE_FORMAT_DXT3_RGBA, 0 }
 719    },
 720    {
 721       { GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 0 },
 722       { PIPE_FORMAT_DXT5_RGBA, 0 }
 723    },
 724
 725 #if 0
 726    {
 727       { GL_COMPRESSED_RGB_FXT1_3DFX, 0 },
 728       { PIPE_FORMAT_RGB_FXT1, 0 }
 729    },
 730    {
 731       { GL_COMPRESSED_RGBA_FXT1_3DFX, 0 },
 732       { PIPE_FORMAT_RGB_FXT1, 0 }
 733    },
 734 #endif
 735
 736    /* Depth formats */
 737    {
 738       { GL_DEPTH_COMPONENT16, 0 },
 739       { PIPE_FORMAT_Z16_UNORM, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 740         PIPE_FORMAT_S8_USCALED_Z24_UNORM, PIPE_FORMAT_Z32_UNORM, 0 }
 741    },
 742    {
 743       { GL_DEPTH_COMPONENT24, 0 },
 744       { PIPE_FORMAT_Z24X8_UNORM, PIPE_FORMAT_X8Z24_UNORM,
 745         PIPE_FORMAT_Z24_UNORM_S8_USCALED, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 746         PIPE_FORMAT_Z32_UNORM, 0 }
 747    },
 748    {
 749       { GL_DEPTH_COMPONENT32, 0 },
 750       { PIPE_FORMAT_Z32_UNORM,
 751         PIPE_FORMAT_Z24X8_UNORM, PIPE_FORMAT_X8Z24_UNORM,
 752         PIPE_FORMAT_Z16_UNORM,
 753         PIPE_FORMAT_Z24_UNORM_S8_USCALED, PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0 }
 754    },
 755    {
 756       { GL_DEPTH_COMPONENT, 0 },
 757       { PIPE_FORMAT_Z24X8_UNORM, PIPE_FORMAT_X8Z24_UNORM,
 758         PIPE_FORMAT_Z32_UNORM, PIPE_FORMAT_Z16_UNORM,
 759         PIPE_FORMAT_Z24_UNORM_S8_USCALED, PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0 }
 760    },
 761
 762    /* stencil formats */
 763    {
 764       { GL_STENCIL_INDEX, GL_STENCIL_INDEX1_EXT, GL_STENCIL_INDEX4_EXT,
 765         GL_STENCIL_INDEX8_EXT, GL_STENCIL_INDEX16_EXT, 0 },
 766       {
 767          PIPE_FORMAT_S8_USCALED, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 768          PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0
 769       }
 770    },
 771
 772    /* Depth / Stencil formats */
 773    {
 774       { GL_DEPTH_STENCIL_EXT, GL_DEPTH24_STENCIL8_EXT, 0 },
 775       { PIPE_FORMAT_Z24_UNORM_S8_USCALED, PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0 }
 776    },
 777
 778    /* sRGB formats */
 779    {
 780       { GL_SRGB_EXT, GL_SRGB8_EXT, GL_SRGB_ALPHA_EXT, GL_SRGB8_ALPHA8_EXT, 0 },
 781       { DEFAULT_SRGBA_FORMATS }
 782    },
 783    {
 784       { GL_COMPRESSED_SRGB_EXT, GL_COMPRESSED_SRGB_S3TC_DXT1_EXT, 0 },
 785       { PIPE_FORMAT_DXT1_SRGB, DEFAULT_SRGBA_FORMATS }
 786    },
 787    {
 788       { GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, 0 },
 789       { PIPE_FORMAT_DXT1_SRGBA, 0 }
 790    },
 791    {
 792       { GL_COMPRESSED_SRGB_ALPHA_EXT,
 793         GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, 0 },
 794       { PIPE_FORMAT_DXT3_SRGBA, DEFAULT_SRGBA_FORMATS }
 795    },
 796    {
 797       { GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT, 0 },
 798       { PIPE_FORMAT_DXT5_SRGBA, 0 }
 799    },
 800    {
 801       { GL_SLUMINANCE_ALPHA_EXT, GL_SLUMINANCE8_ALPHA8_EXT,
 802         GL_COMPRESSED_SLUMINANCE_EXT, GL_COMPRESSED_SLUMINANCE_ALPHA_EXT, 0 },
 803       { PIPE_FORMAT_L8A8_SRGB, DEFAULT_SRGBA_FORMATS }
 804    },
 805    {
 806       { GL_SLUMINANCE_EXT, GL_SLUMINANCE8_EXT, 0 },
 807       { PIPE_FORMAT_L8_SRGB, DEFAULT_SRGBA_FORMATS }
 808    },
 809
 810    /* 16-bit float formats */
 811    {
 812       { GL_RGBA16F_ARB, 0 },
 813       { PIPE_FORMAT_R16G16B16A16_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 814    },
 815    {
 816       { GL_RGB16F_ARB, 0 },
 817       { PIPE_FORMAT_R16G16B16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 818         PIPE_FORMAT_R32G32B32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 819    },
 820    {
 821       { GL_LUMINANCE_ALPHA16F_ARB, 0 },
 822       { PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 823         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 824    },
 825    {
 826       { GL_ALPHA16F_ARB, 0 },
 827       { PIPE_FORMAT_A16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 828         PIPE_FORMAT_A32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 829         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 830    },
 831    {
 832       { GL_INTENSITY16F_ARB, 0 },
 833       { PIPE_FORMAT_I16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 834         PIPE_FORMAT_I32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 835         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 836    },
 837    {
 838       { GL_LUMINANCE16F_ARB, 0 },
 839       { PIPE_FORMAT_L16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 840         PIPE_FORMAT_L32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 841         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 842    },
 843    {
 844       { GL_R16F, 0 },
 845       { PIPE_FORMAT_R16_FLOAT, PIPE_FORMAT_R16G16_FLOAT,
 846         PIPE_FORMAT_R32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 847         PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 848    },
 849    {
 850       { GL_RG16F, 0 },
 851       { PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 852         PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 853    },
 854
 855    /* 32-bit float formats */
 856    {
 857       { GL_RGBA32F_ARB, 0 },
 858       { PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 859    },
 860    {
 861       { GL_RGB32F_ARB, 0 },
 862       { PIPE_FORMAT_R32G32B32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 863         PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 864    },
 865    {
 866       { GL_LUMINANCE_ALPHA32F_ARB, 0 },
 867       { PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 868         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 869    },
 870    {
 871       { GL_ALPHA32F_ARB, 0 },
 872       { PIPE_FORMAT_A32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 873         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_A16_FLOAT,
 874         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 875    },
 876    {
 877       { GL_INTENSITY32F_ARB, 0 },
 878       { PIPE_FORMAT_I32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 879         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_I16_FLOAT,
 880         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 881    },
 882    {
 883       { GL_LUMINANCE32F_ARB, 0 },
 884       { PIPE_FORMAT_L32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 885         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_L16_FLOAT,
 886         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 887    },
 888    {
 889       { GL_R32F, 0 },
 890       { PIPE_FORMAT_R32_FLOAT, PIPE_FORMAT_R32G32_FLOAT,
 891         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_R16_FLOAT,
 892         PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 893    },
 894    {
 895       { GL_RG32F, 0 },
 896       { PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 897         PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 898    },
 899
 900    /* R, RG formats */
 901    {
 902       { GL_RED, GL_R8, 0 },
 903       { PIPE_FORMAT_R8_UNORM, 0 }
 904    },
 905    {
 906       { GL_RG, GL_RG8, 0 },
 907       { PIPE_FORMAT_R8G8_UNORM, 0 }
 908    },
 909    {
 910       { GL_R16, 0 },
 911       { PIPE_FORMAT_R16_UNORM, 0 }
 912    },
 913    {
 914       { GL_RG16, 0 },
 915       { PIPE_FORMAT_R16G16_UNORM, 0 }
 916    },
 917
 918    /* compressed R, RG formats */
 919    {
 920       { GL_COMPRESSED_RED, GL_COMPRESSED_RED_RGTC1, 0 },
 921       { PIPE_FORMAT_RGTC1_UNORM, PIPE_FORMAT_R8_UNORM, 0 }
 922    },
 923    {
 924       { GL_COMPRESSED_SIGNED_RED_RGTC1, 0 },
 925       { PIPE_FORMAT_RGTC1_SNORM, 0 }
 926    },
 927    {
 928       { GL_COMPRESSED_RG, GL_COMPRESSED_RG_RGTC2, 0 },
 929       { PIPE_FORMAT_RGTC2_UNORM, PIPE_FORMAT_R8G8_UNORM, 0 }
 930    },
 931    {
 932       { GL_COMPRESSED_SIGNED_RG_RGTC2, 0 },
 933       { PIPE_FORMAT_RGTC2_SNORM, 0 }
 934    },
 935    {
 936       { GL_COMPRESSED_LUMINANCE, GL_COMPRESSED_LUMINANCE_LATC1_EXT, 0 },
 937       { PIPE_FORMAT_LATC1_UNORM, PIPE_FORMAT_L8_UNORM, 0 }
 938    },
 939    {
 940       { GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT, 0 },
 941       { PIPE_FORMAT_LATC1_SNORM, 0 }
 942    },
 943    {
 944       { GL_COMPRESSED_LUMINANCE_ALPHA, GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT,
 945         GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI, 0 },
 946       { PIPE_FORMAT_LATC2_UNORM, PIPE_FORMAT_L8A8_UNORM, 0 }
 947    },
 948    {
 949       { GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT, 0 },
 950       { PIPE_FORMAT_LATC2_SNORM, 0 }
 951    },
 952
 953    /* signed/unsigned integer formats.
 954     * XXX Mesa only has formats for RGBA signed/unsigned integer formats.
 955     * If/when new formats are added this code should be updated.
 956     */
 957    {
 958       { GL_RED_INTEGER_EXT,
 959         GL_GREEN_INTEGER_EXT,
 960         GL_BLUE_INTEGER_EXT,
 961         GL_ALPHA_INTEGER_EXT,
 962         GL_RGB_INTEGER_EXT,
 963         GL_RGBA_INTEGER_EXT,
 964         GL_BGR_INTEGER_EXT,
 965         GL_BGRA_INTEGER_EXT,
 966         GL_LUMINANCE_INTEGER_EXT,
 967         GL_LUMINANCE_ALPHA_INTEGER_EXT,
 968         GL_RGBA8I_EXT,
 969         GL_RGB8I_EXT,
 970         GL_ALPHA8I_EXT,
 971         GL_INTENSITY8I_EXT,
 972         GL_LUMINANCE8I_EXT,
 973         GL_LUMINANCE_ALPHA8I_EXT, 0 },
 974       { PIPE_FORMAT_R8G8B8A8_SSCALED, 0 }
 975    },
 976    {
 977       {
 978          GL_RGBA16I_EXT,
 979          GL_RGB16I_EXT,
 980          GL_ALPHA16I_EXT,
 981          GL_INTENSITY16I_EXT,
 982          GL_LUMINANCE16I_EXT,
 983          GL_LUMINANCE_ALPHA16I_EXT, 0 },
 984       { PIPE_FORMAT_R16G16B16A16_SSCALED, 0 },
 985    },
 986    {
 987       {
 988          GL_RGBA32I_EXT,
 989          GL_RGB32I_EXT,
 990          GL_ALPHA32I_EXT,
 991          GL_INTENSITY32I_EXT,
 992          GL_LUMINANCE32I_EXT,
 993          GL_LUMINANCE_ALPHA32I_EXT, 0 },
 994       { PIPE_FORMAT_R32G32B32A32_SSCALED, 0 }
 995    },
 996    {
 997       {
 998          GL_RGBA8UI_EXT,
 999          GL_RGB8UI_EXT,
1000          GL_ALPHA8UI_EXT,
1001          GL_INTENSITY8UI_EXT,
1002          GL_LUMINANCE8UI_EXT,
1003          GL_LUMINANCE_ALPHA8UI_EXT, 0 },
1004       { PIPE_FORMAT_R8G8B8A8_USCALED, 0 }
1005    },
1006    {
1007       {
1008          GL_RGBA16UI_EXT,
1009          GL_RGB16UI_EXT,
1010          GL_ALPHA16UI_EXT,
1011          GL_INTENSITY16UI_EXT,
1012          GL_LUMINANCE16UI_EXT,
1013          GL_LUMINANCE_ALPHA16UI_EXT, 0 },
1014       { PIPE_FORMAT_R16G16B16A16_USCALED, 0 }
1015    },
1016    {
1017       {
1018          GL_RGBA32UI_EXT,
1019          GL_RGB32UI_EXT,
1020          GL_ALPHA32UI_EXT,
1021          GL_INTENSITY32UI_EXT,
1022          GL_LUMINANCE32UI_EXT,
1023          GL_LUMINANCE_ALPHA32UI_EXT, 0 },
1024       { PIPE_FORMAT_R32G32B32A32_USCALED, 0 }
1025    },
1026
1027    /* signed normalized formats */
1028    {
1029       { GL_RED_SNORM, GL_R8_SNORM, 0 },
1030       { PIPE_FORMAT_R8_SNORM, PIPE_FORMAT_R8G8_SNORM,
1031         PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1032    },
1033    {
1034       { GL_R16_SNORM, 0 },
1035       { PIPE_FORMAT_R16_SNORM,
1036         PIPE_FORMAT_R16G16_SNORM,
1037         PIPE_FORMAT_R16G16B16A16_SNORM,
1038         PIPE_FORMAT_R8_SNORM,
1039         PIPE_FORMAT_R8G8_SNORM,
1040         PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1041    },
1042    {
1043       { GL_RG_SNORM, GL_RG8_SNORM, 0 },
1044       { PIPE_FORMAT_R8G8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1045    },
1046    {
1047       { GL_RG16_SNORM, 0 },
1048       { PIPE_FORMAT_R16G16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1049         PIPE_FORMAT_R8G8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1050    },
1051    {
1052       { GL_RGB_SNORM, GL_RGB8_SNORM, GL_RGBA_SNORM, GL_RGBA8_SNORM, 0 },
1053       { PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1054    },
1055    {
1056       { GL_RGB16_SNORM, GL_RGBA16_SNORM, 0 },
1057       { PIPE_FORMAT_R16G16B16A16_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1058    },
1059    {
1060       { GL_ALPHA_SNORM, GL_ALPHA8_SNORM, 0 },
1061       { PIPE_FORMAT_A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1062    },
1063    {
1064       { GL_ALPHA16_SNORM, 0 },
1065       { PIPE_FORMAT_A16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1066         PIPE_FORMAT_A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1067    },
1068    {
1069       { GL_LUMINANCE_SNORM, GL_LUMINANCE8_SNORM, 0 },
1070       { PIPE_FORMAT_L8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1071    },
1072    {
1073       { GL_LUMINANCE16_SNORM, 0 },
1074       { PIPE_FORMAT_L16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1075         PIPE_FORMAT_L8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1076    },
1077    {
1078       { GL_LUMINANCE_ALPHA_SNORM, GL_LUMINANCE8_ALPHA8_SNORM, 0 },
1079       { PIPE_FORMAT_L8A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1080    },
1081    {
1082       { GL_LUMINANCE16_ALPHA16_SNORM, 0 },
1083       { PIPE_FORMAT_L16A16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1084         PIPE_FORMAT_L8A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1085    },
1086    {
1087       { GL_INTENSITY_SNORM, GL_INTENSITY8_SNORM, 0 },
1088       { PIPE_FORMAT_I8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1089    },
1090    {
1091       { GL_INTENSITY16_SNORM, 0 },
1092       { PIPE_FORMAT_I16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1093         PIPE_FORMAT_I8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1094    }
1095 };
1096
1097
1098 /**
1099  * Return first supported format from the given list.
1100  */
1101 static enum pipe_format
1102 find_supported_format(struct pipe_screen *screen,
1103                       const enum pipe_format formats[],
1104                       enum pipe_texture_target target,
1105                       unsigned sample_count,
1106                       unsigned tex_usage)
1107 {
1108    uint i;
1109    for (i = 0; formats[i]; i++) {
1110       if (screen->is_format_supported(screen, formats[i], target,
1111                                       sample_count, tex_usage)) {
1112          return formats[i];
1113       }
1114    }
1115    return PIPE_FORMAT_NONE;
1116 }
1117
1118
1119 /**
1120  * Given an OpenGL internalFormat value for a texture or surface, return
1121  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
1122  * This is called during glTexImage2D, for example.
1123  *
1124  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
1125  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
1126  * we want render-to-texture ability.
1127  *
1128  * \param internalFormat  the user value passed to glTexImage2D
1129  * \param target  one of PIPE_TEXTURE_x
1130  * \param bindings  bitmask of PIPE_BIND_x flags.
1131  */
1132 enum pipe_format
1133 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
1134                  enum pipe_texture_target target, unsigned sample_count,
1135                  unsigned bindings)
1136 {
1137    GET_CURRENT_CONTEXT(ctx); /* XXX this should be a function parameter */
1138    int i, j;
1139
1140    /* can't render to compressed formats at this time */
1141    if (_mesa_is_compressed_format(ctx, internalFormat)
1142        && (bindings & ~PIPE_BIND_SAMPLER_VIEW)) {
1143       return PIPE_FORMAT_NONE;
1144    }
1145
1146    /* search table for internalFormat */
1147    for (i = 0; i < Elements(format_map); i++) {
1148       const struct format_mapping *mapping = &format_map[i];
1149       for (j = 0; mapping->glFormats[j]; j++) {
1150          if (mapping->glFormats[j] == internalFormat) {
1151             /* Found the desired internal format.  Find first pipe format
1152              * which is supported by the driver.
1153              */
1154             return find_supported_format(screen, mapping->pipeFormats,
1155                                          target, sample_count, bindings);
1156          }
1157       }
1158    }
1159
1160    _mesa_problem(NULL, "unhandled format!\n");
1161    return PIPE_FORMAT_NONE;
1162 }
1163
1164
1165 /**
1166  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
1167  */
1168 enum pipe_format
1169 st_choose_renderbuffer_format(struct pipe_screen *screen,
1170                               GLenum internalFormat, unsigned sample_count)
1171 {
1172    uint usage;
1173    if (_mesa_is_depth_or_stencil_format(internalFormat))
1174       usage = PIPE_BIND_DEPTH_STENCIL;
1175    else
1176       usage = PIPE_BIND_RENDER_TARGET;
1177    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,
1178                            sample_count, usage);
1179 }
1180
1181
1182 /**
1183  * Called via ctx->Driver.chooseTextureFormat().
1184  */
1185 gl_format
1186 st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,
1187                                   GLenum format, GLenum type, GLboolean renderable)
1188 {
1189    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
1190    enum pipe_format pFormat;
1191    uint bindings;
1192
1193    (void) format;
1194    (void) type;
1195
1196    /* GL textures may wind up being render targets, but we don't know
1197     * that in advance.  Specify potential render target flags now.
1198     */
1199    bindings = PIPE_BIND_SAMPLER_VIEW;
1200    if (renderable == GL_TRUE) {
1201       if (_mesa_is_depth_format(internalFormat) ||
1202           _mesa_is_depth_or_stencil_format(internalFormat))
1203          bindings |= PIPE_BIND_DEPTH_STENCIL;
1204       else
1205          bindings |= PIPE_BIND_RENDER_TARGET;
1206    }
1207
1208    pFormat = st_choose_format(screen, internalFormat,
1209                               PIPE_TEXTURE_2D, 0, bindings);
1210
1211    if (pFormat == PIPE_FORMAT_NONE) {
1212       /* try choosing format again, this time without render target bindings */
1213       pFormat = st_choose_format(screen, internalFormat,
1214                                  PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
1215    }
1216
1217    if (pFormat == PIPE_FORMAT_NONE) {
1218       /* no luck at all */
1219       return MESA_FORMAT_NONE;
1220    }
1221
1222    return st_pipe_format_to_mesa_format(pFormat);
1223 }
1224
1225 gl_format
1226 st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
1227                        GLenum format, GLenum type)
1228 {
1229    boolean want_renderable =
1230       internalFormat == 3 || internalFormat == 4 ||
1231       internalFormat == GL_RGB || internalFormat == GL_RGBA ||
1232       internalFormat == GL_RGB8 || internalFormat == GL_RGBA8 ||
1233       internalFormat == GL_BGRA;
1234
1235    return st_ChooseTextureFormat_renderable(ctx, internalFormat,
1236                                             format, type, want_renderable);
1237 }
1238
1239 /**
1240  * Test if a gallium format is equivalent to a GL format/type.
1241  */
1242 GLboolean
1243 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
1244 {
1245    switch (pFormat) {
1246    case PIPE_FORMAT_A8B8G8R8_UNORM:
1247       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
1248    case PIPE_FORMAT_A8R8G8B8_UNORM:
1249       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
1250    case PIPE_FORMAT_B5G6R5_UNORM:
1251       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
1252    /* XXX more combos... */
1253    default:
1254       return GL_FALSE;
1255    }
1256 }
1257
1258 GLboolean
1259 st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
1260 {
1261    if (format1 == format2)
1262       return GL_TRUE;
1263
1264    if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
1265        format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
1266       return GL_TRUE;
1267
1268    if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
1269        format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
1270       return GL_TRUE;
1271
1272    if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
1273        format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
1274       return GL_TRUE;
1275
1276    if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
1277        format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
1278       return GL_TRUE;
1279
1280    if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
1281        format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
1282       return GL_TRUE;
1283
1284    if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
1285        format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
1286       return GL_TRUE;
1287
1288    return GL_FALSE;
1289 }
1290
1291
1292
1293 /**
1294  * This is used for translating texture border color and the clear
1295  * color.  For example, the clear color is interpreted according to
1296  * the renderbuffer's base format.  For example, if clearing a
1297  * GL_LUMINANCE buffer, ClearColor[0] = luminance and ClearColor[1] =
1298  * alpha.  Similarly for texture border colors.
1299  */
1300 void
1301 st_translate_color(const GLfloat colorIn[4], GLenum baseFormat,
1302                    GLfloat colorOut[4])
1303 {
1304    switch (baseFormat) {
1305    case GL_RED:
1306       colorOut[0] = colorIn[0];
1307       colorOut[1] = 0.0F;
1308       colorOut[2] = 0.0F;
1309       colorOut[3] = 1.0F;
1310       break;
1311    case GL_RG:
1312       colorOut[0] = colorIn[0];
1313       colorOut[1] = colorIn[1];
1314       colorOut[2] = 0.0F;
1315       colorOut[3] = 1.0F;
1316       break;
1317    case GL_RGB:
1318       colorOut[0] = colorIn[0];
1319       colorOut[1] = colorIn[1];
1320       colorOut[2] = colorIn[2];
1321       colorOut[3] = 1.0F;
1322       break;
1323    case GL_ALPHA:
1324       colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
1325       colorOut[3] = colorIn[3];
1326       break;
1327    case GL_LUMINANCE:
1328       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1329       colorOut[3] = 1.0;
1330       break;
1331    case GL_LUMINANCE_ALPHA:
1332       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1333       colorOut[3] = colorIn[3];
1334       break;
1335    case GL_INTENSITY:
1336       colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
1337       break;
1338    default:
1339       COPY_4V(colorOut, colorIn);
1340    }
1341 }