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    int i;
  72
  73    desc = util_format_description(format);
  74    assert(desc);
  75
  76    /* Find the first non-VOID channel. */
  77    for (i = 0; i < 4; i++) {
  78        if (desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
  79            break;
  80        }
  81    }
  82
  83    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  84       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  85           format == PIPE_FORMAT_B5G6R5_UNORM) {
  86          return GL_UNSIGNED_SHORT;
  87       }
  88       else if (format == PIPE_FORMAT_R11G11B10_FLOAT ||
  89                format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
  90          return GL_FLOAT;
  91       }
  92       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  93                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM ||
  94                format == PIPE_FORMAT_Z24X8_UNORM ||
  95                format == PIPE_FORMAT_X8Z24_UNORM) {
  96          return GL_UNSIGNED_INT_24_8;
  97       }
  98       else if (format == PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED) {
  99          return GL_FLOAT_32_UNSIGNED_INT_24_8_REV;
 100       }
 101       else {
 102          const GLuint size = format_max_bits(format);
 103
 104          assert(i < 4);
 105          if (i == 4)
 106             return GL_NONE;
 107
 108          if (size == 8) {
 109             if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
 110                return GL_UNSIGNED_BYTE;
 111             else
 112                return GL_BYTE;
 113          }
 114          else if (size == 16) {
 115             if (desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)
 116                return GL_HALF_FLOAT;
 117             if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
 118                return GL_UNSIGNED_SHORT;
 119             else
 120                return GL_SHORT;
 121          }
 122          else if (size <= 32) {
 123             if (desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT)
 124                return GL_FLOAT;
 125             if (desc->channel[i].type == UTIL_FORMAT_TYPE_UNSIGNED)
 126                return GL_UNSIGNED_INT;
 127             else
 128                return GL_INT;
 129          }
 130          else {
 131             assert(size == 64);
 132             assert(desc->channel[i].type == UTIL_FORMAT_TYPE_FLOAT);
 133             return GL_DOUBLE;
 134          }
 135       }
 136    }
 137    else if (format == PIPE_FORMAT_UYVY) {
 138       return GL_UNSIGNED_SHORT;
 139    }
 140    else if (format == PIPE_FORMAT_YUYV) {
 141       return GL_UNSIGNED_SHORT;
 142    }
 143    else {
 144       /* probably a compressed format, unsupported anyway */
 145       return GL_NONE;
 146    }
 147 }
 148
 149
 150 /**
 151  * Translate Mesa format to Gallium format.
 152  */
 153 enum pipe_format
 154 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 155 {
 156    switch (mesaFormat) {
 157    case MESA_FORMAT_RGBA8888:
 158       return PIPE_FORMAT_A8B8G8R8_UNORM;
 159    case MESA_FORMAT_RGBA8888_REV:
 160       return PIPE_FORMAT_R8G8B8A8_UNORM;
 161    case MESA_FORMAT_ARGB8888:
 162       return PIPE_FORMAT_B8G8R8A8_UNORM;
 163    case MESA_FORMAT_ARGB8888_REV:
 164       return PIPE_FORMAT_A8R8G8B8_UNORM;
 165    case MESA_FORMAT_XRGB8888:
 166       return PIPE_FORMAT_B8G8R8X8_UNORM;
 167    case MESA_FORMAT_XRGB8888_REV:
 168       return PIPE_FORMAT_X8R8G8B8_UNORM;
 169    case MESA_FORMAT_ARGB1555:
 170       return PIPE_FORMAT_B5G5R5A1_UNORM;
 171    case MESA_FORMAT_ARGB4444:
 172       return PIPE_FORMAT_B4G4R4A4_UNORM;
 173    case MESA_FORMAT_RGB565:
 174       return PIPE_FORMAT_B5G6R5_UNORM;
 175    case MESA_FORMAT_RGB332:
 176       return PIPE_FORMAT_B2G3R3_UNORM;
 177    case MESA_FORMAT_ARGB2101010:
 178       return PIPE_FORMAT_B10G10R10A2_UNORM;
 179    case MESA_FORMAT_AL44:
 180       return PIPE_FORMAT_L4A4_UNORM;
 181    case MESA_FORMAT_AL88:
 182       return PIPE_FORMAT_L8A8_UNORM;
 183    case MESA_FORMAT_AL1616:
 184       return PIPE_FORMAT_L16A16_UNORM;
 185    case MESA_FORMAT_A8:
 186       return PIPE_FORMAT_A8_UNORM;
 187    case MESA_FORMAT_A16:
 188       return PIPE_FORMAT_A16_UNORM;
 189    case MESA_FORMAT_L8:
 190       return PIPE_FORMAT_L8_UNORM;
 191    case MESA_FORMAT_L16:
 192       return PIPE_FORMAT_L16_UNORM;
 193    case MESA_FORMAT_I8:
 194       return PIPE_FORMAT_I8_UNORM;
 195    case MESA_FORMAT_I16:
 196       return PIPE_FORMAT_I16_UNORM;
 197    case MESA_FORMAT_Z16:
 198       return PIPE_FORMAT_Z16_UNORM;
 199    case MESA_FORMAT_Z32:
 200       return PIPE_FORMAT_Z32_UNORM;
 201    case MESA_FORMAT_Z24_S8:
 202       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 203    case MESA_FORMAT_S8_Z24:
 204       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 205    case MESA_FORMAT_Z24_X8:
 206       return PIPE_FORMAT_X8Z24_UNORM;
 207    case MESA_FORMAT_X8_Z24:
 208       return PIPE_FORMAT_Z24X8_UNORM;
 209    case MESA_FORMAT_S8:
 210       return PIPE_FORMAT_S8_USCALED;
 211    case MESA_FORMAT_Z32_FLOAT:
 212       return PIPE_FORMAT_Z32_FLOAT;
 213    case MESA_FORMAT_Z32_FLOAT_X24S8:
 214       return PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED;
 215    case MESA_FORMAT_YCBCR:
 216       return PIPE_FORMAT_UYVY;
 217 #if FEATURE_texture_s3tc
 218    case MESA_FORMAT_RGB_DXT1:
 219       return PIPE_FORMAT_DXT1_RGB;
 220    case MESA_FORMAT_RGBA_DXT1:
 221       return PIPE_FORMAT_DXT1_RGBA;
 222    case MESA_FORMAT_RGBA_DXT3:
 223       return PIPE_FORMAT_DXT3_RGBA;
 224    case MESA_FORMAT_RGBA_DXT5:
 225       return PIPE_FORMAT_DXT5_RGBA;
 226 #if FEATURE_EXT_texture_sRGB
 227    case MESA_FORMAT_SRGB_DXT1:
 228       return PIPE_FORMAT_DXT1_SRGB;
 229    case MESA_FORMAT_SRGBA_DXT1:
 230       return PIPE_FORMAT_DXT1_SRGBA;
 231    case MESA_FORMAT_SRGBA_DXT3:
 232       return PIPE_FORMAT_DXT3_SRGBA;
 233    case MESA_FORMAT_SRGBA_DXT5:
 234       return PIPE_FORMAT_DXT5_SRGBA;
 235 #endif
 236 #endif
 237 #if FEATURE_EXT_texture_sRGB
 238    case MESA_FORMAT_SLA8:
 239       return PIPE_FORMAT_L8A8_SRGB;
 240    case MESA_FORMAT_SL8:
 241       return PIPE_FORMAT_L8_SRGB;
 242    case MESA_FORMAT_SRGB8:
 243       return PIPE_FORMAT_R8G8B8_SRGB;
 244    case MESA_FORMAT_SRGBA8:
 245       return PIPE_FORMAT_A8B8G8R8_SRGB;
 246    case MESA_FORMAT_SARGB8:
 247       return PIPE_FORMAT_B8G8R8A8_SRGB;
 248 #endif
 249    case MESA_FORMAT_RGBA_FLOAT32:
 250       return PIPE_FORMAT_R32G32B32A32_FLOAT;
 251    case MESA_FORMAT_RGBA_FLOAT16:
 252       return PIPE_FORMAT_R16G16B16A16_FLOAT;
 253    case MESA_FORMAT_RGB_FLOAT32:
 254       return PIPE_FORMAT_R32G32B32_FLOAT;
 255    case MESA_FORMAT_RGB_FLOAT16:
 256       return PIPE_FORMAT_R16G16B16_FLOAT;
 257    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32:
 258       return PIPE_FORMAT_L32A32_FLOAT;
 259    case MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16:
 260       return PIPE_FORMAT_L16A16_FLOAT;
 261    case MESA_FORMAT_LUMINANCE_FLOAT32:
 262       return PIPE_FORMAT_L32_FLOAT;
 263    case MESA_FORMAT_LUMINANCE_FLOAT16:
 264       return PIPE_FORMAT_L16_FLOAT;
 265    case MESA_FORMAT_ALPHA_FLOAT32:
 266       return PIPE_FORMAT_A32_FLOAT;
 267    case MESA_FORMAT_ALPHA_FLOAT16:
 268       return PIPE_FORMAT_A16_FLOAT;
 269    case MESA_FORMAT_INTENSITY_FLOAT32:
 270       return PIPE_FORMAT_I32_FLOAT;
 271    case MESA_FORMAT_INTENSITY_FLOAT16:
 272       return PIPE_FORMAT_I16_FLOAT;
 273    case MESA_FORMAT_R_FLOAT32:
 274       return PIPE_FORMAT_R32_FLOAT;
 275    case MESA_FORMAT_R_FLOAT16:
 276       return PIPE_FORMAT_R16_FLOAT;
 277    case MESA_FORMAT_RG_FLOAT32:
 278       return PIPE_FORMAT_R32G32_FLOAT;
 279    case MESA_FORMAT_RG_FLOAT16:
 280       return PIPE_FORMAT_R16G16_FLOAT;
 281
 282    case MESA_FORMAT_R8:
 283       return PIPE_FORMAT_R8_UNORM;
 284    case MESA_FORMAT_R16:
 285       return PIPE_FORMAT_R16_UNORM;
 286    case MESA_FORMAT_RG88:
 287       return PIPE_FORMAT_R8G8_UNORM;
 288    case MESA_FORMAT_RG1616:
 289       return PIPE_FORMAT_R16G16_UNORM;
 290    case MESA_FORMAT_RGBA_16:
 291       return PIPE_FORMAT_R16G16B16A16_UNORM;
 292
 293    /* signed int formats */
 294    case MESA_FORMAT_RGBA_INT8:
 295       return PIPE_FORMAT_R8G8B8A8_SSCALED;
 296    case MESA_FORMAT_RGBA_INT16:
 297       return PIPE_FORMAT_R16G16B16A16_SSCALED;
 298    case MESA_FORMAT_RGBA_INT32:
 299       return PIPE_FORMAT_R32G32B32A32_SSCALED;
 300
 301    /* unsigned int formats */
 302    case MESA_FORMAT_RGBA_UINT8:
 303       return PIPE_FORMAT_R8G8B8A8_USCALED;
 304    case MESA_FORMAT_RGBA_UINT16:
 305       return PIPE_FORMAT_R16G16B16A16_USCALED;
 306    case MESA_FORMAT_RGBA_UINT32:
 307       return PIPE_FORMAT_R32G32B32A32_USCALED;
 308
 309    case MESA_FORMAT_RED_RGTC1:
 310       return PIPE_FORMAT_RGTC1_UNORM;
 311    case MESA_FORMAT_SIGNED_RED_RGTC1:
 312       return PIPE_FORMAT_RGTC1_SNORM;
 313    case MESA_FORMAT_RG_RGTC2:
 314       return PIPE_FORMAT_RGTC2_UNORM;
 315    case MESA_FORMAT_SIGNED_RG_RGTC2:
 316       return PIPE_FORMAT_RGTC2_SNORM;
 317
 318    case MESA_FORMAT_L_LATC1:
 319       return PIPE_FORMAT_LATC1_UNORM;
 320    case MESA_FORMAT_SIGNED_L_LATC1:
 321       return PIPE_FORMAT_LATC1_SNORM;
 322    case MESA_FORMAT_LA_LATC2:
 323       return PIPE_FORMAT_LATC2_UNORM;
 324    case MESA_FORMAT_SIGNED_LA_LATC2:
 325       return PIPE_FORMAT_LATC2_SNORM;
 326
 327    /* signed normalized formats */
 328    case MESA_FORMAT_SIGNED_R8:
 329       return PIPE_FORMAT_R8_SNORM;
 330    case MESA_FORMAT_SIGNED_RG88_REV:
 331       return PIPE_FORMAT_R8G8_SNORM;
 332    case MESA_FORMAT_SIGNED_RGBA8888_REV:
 333       return PIPE_FORMAT_R8G8B8A8_SNORM;
 334
 335    case MESA_FORMAT_SIGNED_A8:
 336       return PIPE_FORMAT_A8_SNORM;
 337    case MESA_FORMAT_SIGNED_L8:
 338       return PIPE_FORMAT_L8_SNORM;
 339    case MESA_FORMAT_SIGNED_AL88:
 340       return PIPE_FORMAT_L8A8_SNORM;
 341    case MESA_FORMAT_SIGNED_I8:
 342       return PIPE_FORMAT_I8_SNORM;
 343
 344    case MESA_FORMAT_SIGNED_R16:
 345       return PIPE_FORMAT_R16_SNORM;
 346    case MESA_FORMAT_SIGNED_GR1616:
 347       return PIPE_FORMAT_R16G16_SNORM;
 348    case MESA_FORMAT_SIGNED_RGBA_16:
 349       return PIPE_FORMAT_R16G16B16A16_SNORM;
 350
 351    case MESA_FORMAT_SIGNED_A16:
 352       return PIPE_FORMAT_A16_SNORM;
 353    case MESA_FORMAT_SIGNED_L16:
 354       return PIPE_FORMAT_L16_SNORM;
 355    case MESA_FORMAT_SIGNED_AL1616:
 356       return PIPE_FORMAT_L16A16_SNORM;
 357    case MESA_FORMAT_SIGNED_I16:
 358       return PIPE_FORMAT_I16_SNORM;
 359
 360    case MESA_FORMAT_RGB9_E5_FLOAT:
 361       return PIPE_FORMAT_R9G9B9E5_FLOAT;
 362    case MESA_FORMAT_R11_G11_B10_FLOAT:
 363       return PIPE_FORMAT_R11G11B10_FLOAT;
 364
 365    default:
 366       assert(0);
 367       return PIPE_FORMAT_NONE;
 368    }
 369 }
 370
 371
 372 /**
 373  * Translate Gallium format to Mesa format.
 374  */
 375 gl_format
 376 st_pipe_format_to_mesa_format(enum pipe_format format)
 377 {
 378    switch (format) {
 379    case PIPE_FORMAT_A8B8G8R8_UNORM:
 380       return MESA_FORMAT_RGBA8888;
 381    case PIPE_FORMAT_R8G8B8A8_UNORM:
 382       return MESA_FORMAT_RGBA8888_REV;
 383    case PIPE_FORMAT_B8G8R8A8_UNORM:
 384       return MESA_FORMAT_ARGB8888;
 385    case PIPE_FORMAT_A8R8G8B8_UNORM:
 386       return MESA_FORMAT_ARGB8888_REV;
 387    case PIPE_FORMAT_B8G8R8X8_UNORM:
 388       return MESA_FORMAT_XRGB8888;
 389    case PIPE_FORMAT_X8R8G8B8_UNORM:
 390       return MESA_FORMAT_XRGB8888_REV;
 391    case PIPE_FORMAT_B5G5R5A1_UNORM:
 392       return MESA_FORMAT_ARGB1555;
 393    case PIPE_FORMAT_B4G4R4A4_UNORM:
 394       return MESA_FORMAT_ARGB4444;
 395    case PIPE_FORMAT_B5G6R5_UNORM:
 396       return MESA_FORMAT_RGB565;
 397    case PIPE_FORMAT_B2G3R3_UNORM:
 398       return MESA_FORMAT_RGB332;
 399    case PIPE_FORMAT_B10G10R10A2_UNORM:
 400       return MESA_FORMAT_ARGB2101010;
 401    case PIPE_FORMAT_L4A4_UNORM:
 402       return MESA_FORMAT_AL44;
 403    case PIPE_FORMAT_L8A8_UNORM:
 404       return MESA_FORMAT_AL88;
 405    case PIPE_FORMAT_L16A16_UNORM:
 406       return MESA_FORMAT_AL1616;
 407    case PIPE_FORMAT_A8_UNORM:
 408       return MESA_FORMAT_A8;
 409    case PIPE_FORMAT_A16_UNORM:
 410       return MESA_FORMAT_A16;
 411    case PIPE_FORMAT_L8_UNORM:
 412       return MESA_FORMAT_L8;
 413    case PIPE_FORMAT_L16_UNORM:
 414       return MESA_FORMAT_L16;
 415    case PIPE_FORMAT_I8_UNORM:
 416       return MESA_FORMAT_I8;
 417    case PIPE_FORMAT_I16_UNORM:
 418       return MESA_FORMAT_I16;
 419    case PIPE_FORMAT_S8_USCALED:
 420       return MESA_FORMAT_S8;
 421
 422    case PIPE_FORMAT_R16G16B16A16_UNORM:
 423       return MESA_FORMAT_RGBA_16;
 424
 425    case PIPE_FORMAT_Z16_UNORM:
 426       return MESA_FORMAT_Z16;
 427    case PIPE_FORMAT_Z32_UNORM:
 428       return MESA_FORMAT_Z32;
 429    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 430       return MESA_FORMAT_Z24_S8;
 431    case PIPE_FORMAT_X8Z24_UNORM:
 432       return MESA_FORMAT_Z24_X8;
 433    case PIPE_FORMAT_Z24X8_UNORM:
 434       return MESA_FORMAT_X8_Z24;
 435    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 436       return MESA_FORMAT_S8_Z24;
 437    case PIPE_FORMAT_Z32_FLOAT:
 438       return MESA_FORMAT_Z32_FLOAT;
 439    case PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED:
 440       return MESA_FORMAT_Z32_FLOAT_X24S8;
 441
 442    case PIPE_FORMAT_UYVY:
 443       return MESA_FORMAT_YCBCR;
 444    case PIPE_FORMAT_YUYV:
 445       return MESA_FORMAT_YCBCR_REV;
 446
 447 #if FEATURE_texture_s3tc
 448    case PIPE_FORMAT_DXT1_RGB:
 449       return MESA_FORMAT_RGB_DXT1;
 450    case PIPE_FORMAT_DXT1_RGBA:
 451       return MESA_FORMAT_RGBA_DXT1;
 452    case PIPE_FORMAT_DXT3_RGBA:
 453       return MESA_FORMAT_RGBA_DXT3;
 454    case PIPE_FORMAT_DXT5_RGBA:
 455       return MESA_FORMAT_RGBA_DXT5;
 456 #if FEATURE_EXT_texture_sRGB
 457    case PIPE_FORMAT_DXT1_SRGB:
 458       return MESA_FORMAT_SRGB_DXT1;
 459    case PIPE_FORMAT_DXT1_SRGBA:
 460       return MESA_FORMAT_SRGBA_DXT1;
 461    case PIPE_FORMAT_DXT3_SRGBA:
 462       return MESA_FORMAT_SRGBA_DXT3;
 463    case PIPE_FORMAT_DXT5_SRGBA:
 464       return MESA_FORMAT_SRGBA_DXT5;
 465 #endif
 466 #endif
 467
 468 #if FEATURE_EXT_texture_sRGB
 469    case PIPE_FORMAT_L8A8_SRGB:
 470       return MESA_FORMAT_SLA8;
 471    case PIPE_FORMAT_L8_SRGB:
 472       return MESA_FORMAT_SL8;
 473    case PIPE_FORMAT_R8G8B8_SRGB:
 474       return MESA_FORMAT_SRGB8;
 475    case PIPE_FORMAT_A8B8G8R8_SRGB:
 476       return MESA_FORMAT_SRGBA8;
 477    case PIPE_FORMAT_B8G8R8A8_SRGB:
 478       return MESA_FORMAT_SARGB8;
 479 #endif
 480    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 481       return MESA_FORMAT_RGBA_FLOAT32;
 482    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 483       return MESA_FORMAT_RGBA_FLOAT16;
 484    case PIPE_FORMAT_R32G32B32_FLOAT:
 485       return MESA_FORMAT_RGB_FLOAT32;
 486    case PIPE_FORMAT_R16G16B16_FLOAT:
 487       return MESA_FORMAT_RGB_FLOAT16;
 488    case PIPE_FORMAT_L32A32_FLOAT:
 489       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 490    case PIPE_FORMAT_L16A16_FLOAT:
 491       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 492    case PIPE_FORMAT_L32_FLOAT:
 493       return MESA_FORMAT_LUMINANCE_FLOAT32;
 494    case PIPE_FORMAT_L16_FLOAT:
 495       return MESA_FORMAT_LUMINANCE_FLOAT16;
 496    case PIPE_FORMAT_A32_FLOAT:
 497       return MESA_FORMAT_ALPHA_FLOAT32;
 498    case PIPE_FORMAT_A16_FLOAT:
 499       return MESA_FORMAT_ALPHA_FLOAT16;
 500    case PIPE_FORMAT_I32_FLOAT:
 501       return MESA_FORMAT_INTENSITY_FLOAT32;
 502    case PIPE_FORMAT_I16_FLOAT:
 503       return MESA_FORMAT_INTENSITY_FLOAT16;
 504    case PIPE_FORMAT_R32_FLOAT:
 505       return MESA_FORMAT_R_FLOAT32;
 506    case PIPE_FORMAT_R16_FLOAT:
 507       return MESA_FORMAT_R_FLOAT16;
 508    case PIPE_FORMAT_R32G32_FLOAT:
 509       return MESA_FORMAT_RG_FLOAT32;
 510    case PIPE_FORMAT_R16G16_FLOAT:
 511       return MESA_FORMAT_RG_FLOAT16;
 512
 513    case PIPE_FORMAT_R8_UNORM:
 514       return MESA_FORMAT_R8;
 515    case PIPE_FORMAT_R16_UNORM:
 516       return MESA_FORMAT_R16;
 517    case PIPE_FORMAT_R8G8_UNORM:
 518       return MESA_FORMAT_RG88;
 519    case PIPE_FORMAT_R16G16_UNORM:
 520       return MESA_FORMAT_RG1616;
 521
 522    /* signed int formats */
 523    case PIPE_FORMAT_R8G8B8A8_SSCALED:
 524       return MESA_FORMAT_RGBA_INT8;
 525    case PIPE_FORMAT_R16G16B16A16_SSCALED:
 526       return MESA_FORMAT_RGBA_INT16;
 527    case PIPE_FORMAT_R32G32B32A32_SSCALED:
 528       return MESA_FORMAT_RGBA_INT32;
 529
 530    /* unsigned int formats */
 531    case PIPE_FORMAT_R8G8B8A8_USCALED:
 532       return MESA_FORMAT_RGBA_UINT8;
 533    case PIPE_FORMAT_R16G16B16A16_USCALED:
 534       return MESA_FORMAT_RGBA_UINT16;
 535    case PIPE_FORMAT_R32G32B32A32_USCALED:
 536       return MESA_FORMAT_RGBA_UINT32;
 537
 538    case PIPE_FORMAT_RGTC1_UNORM:
 539       return MESA_FORMAT_RED_RGTC1;
 540    case PIPE_FORMAT_RGTC1_SNORM:
 541       return MESA_FORMAT_SIGNED_RED_RGTC1;
 542    case PIPE_FORMAT_RGTC2_UNORM:
 543       return MESA_FORMAT_RG_RGTC2;
 544    case PIPE_FORMAT_RGTC2_SNORM:
 545       return MESA_FORMAT_SIGNED_RG_RGTC2;
 546
 547    case PIPE_FORMAT_LATC1_UNORM:
 548       return MESA_FORMAT_L_LATC1;
 549    case PIPE_FORMAT_LATC1_SNORM:
 550       return MESA_FORMAT_SIGNED_L_LATC1;
 551    case PIPE_FORMAT_LATC2_UNORM:
 552       return MESA_FORMAT_LA_LATC2;
 553    case PIPE_FORMAT_LATC2_SNORM:
 554       return MESA_FORMAT_SIGNED_LA_LATC2;
 555
 556    /* signed normalized formats */
 557    case PIPE_FORMAT_R8_SNORM:
 558       return MESA_FORMAT_SIGNED_R8;
 559    case PIPE_FORMAT_R8G8_SNORM:
 560       return MESA_FORMAT_SIGNED_RG88_REV;
 561    case PIPE_FORMAT_R8G8B8A8_SNORM:
 562       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 563
 564    case PIPE_FORMAT_A8_SNORM:
 565       return MESA_FORMAT_SIGNED_A8;
 566    case PIPE_FORMAT_L8_SNORM:
 567       return MESA_FORMAT_SIGNED_L8;
 568    case PIPE_FORMAT_L8A8_SNORM:
 569       return MESA_FORMAT_SIGNED_AL88;
 570    case PIPE_FORMAT_I8_SNORM:
 571       return MESA_FORMAT_SIGNED_I8;
 572
 573    case PIPE_FORMAT_R16_SNORM:
 574       return MESA_FORMAT_SIGNED_R16;
 575    case PIPE_FORMAT_R16G16_SNORM:
 576       return MESA_FORMAT_SIGNED_GR1616;
 577    case PIPE_FORMAT_R16G16B16A16_SNORM:
 578       return MESA_FORMAT_SIGNED_RGBA_16;
 579
 580    case PIPE_FORMAT_A16_SNORM:
 581       return MESA_FORMAT_SIGNED_A16;
 582    case PIPE_FORMAT_L16_SNORM:
 583       return MESA_FORMAT_SIGNED_L16;
 584    case PIPE_FORMAT_L16A16_SNORM:
 585       return MESA_FORMAT_SIGNED_AL1616;
 586    case PIPE_FORMAT_I16_SNORM:
 587       return MESA_FORMAT_SIGNED_I16;
 588
 589    case PIPE_FORMAT_R9G9B9E5_FLOAT:
 590       return MESA_FORMAT_RGB9_E5_FLOAT;
 591    case PIPE_FORMAT_R11G11B10_FLOAT:
 592       return MESA_FORMAT_R11_G11_B10_FLOAT;
 593
 594    default:
 595       assert(0);
 596       return MESA_FORMAT_NONE;
 597    }
 598 }
 599
 600
 601 /**
 602  * Map GL texture formats to Gallium pipe formats.
 603  */
 604 struct format_mapping
 605 {
 606    GLenum glFormats[18];       /**< list of GLenum formats, 0-terminated */
 607    enum pipe_format pipeFormats[10]; /**< list of pipe formats, 0-terminated */
 608 };
 609
 610
 611 #define DEFAULT_RGBA_FORMATS \
 612       PIPE_FORMAT_B8G8R8A8_UNORM, \
 613       PIPE_FORMAT_A8R8G8B8_UNORM, \
 614       PIPE_FORMAT_A8B8G8R8_UNORM, \
 615       PIPE_FORMAT_B5G6R5_UNORM, \
 616       0
 617
 618 #define DEFAULT_RGB_FORMATS \
 619       PIPE_FORMAT_B8G8R8X8_UNORM, \
 620       PIPE_FORMAT_X8R8G8B8_UNORM, \
 621       PIPE_FORMAT_X8B8G8R8_UNORM, \
 622       PIPE_FORMAT_B8G8R8A8_UNORM, \
 623       PIPE_FORMAT_A8R8G8B8_UNORM, \
 624       PIPE_FORMAT_A8B8G8R8_UNORM, \
 625       PIPE_FORMAT_B5G6R5_UNORM, \
 626       0
 627
 628 #define DEFAULT_SRGBA_FORMATS \
 629       PIPE_FORMAT_B8G8R8A8_SRGB, \
 630       PIPE_FORMAT_A8R8G8B8_SRGB, \
 631       PIPE_FORMAT_A8B8G8R8_SRGB, \
 632       0
 633
 634 #define DEFAULT_DEPTH_FORMATS \
 635       PIPE_FORMAT_Z24X8_UNORM, \
 636       PIPE_FORMAT_X8Z24_UNORM, \
 637       PIPE_FORMAT_Z16_UNORM, \
 638       PIPE_FORMAT_Z24_UNORM_S8_USCALED, \
 639       PIPE_FORMAT_S8_USCALED_Z24_UNORM, \
 640       0
 641
 642 /**
 643  * This table maps OpenGL texture format enums to Gallium pipe_format enums.
 644  * Multiple GL enums might map to multiple pipe_formats.
 645  * The first pipe format in the list that's supported is the one that's chosen.
 646  */
 647 static const struct format_mapping format_map[] = {
 648    /* Basic RGB, RGBA formats */
 649    {
 650       { GL_RGB10, GL_RGB10_A2, 0 },
 651       { PIPE_FORMAT_B10G10R10A2_UNORM, DEFAULT_RGBA_FORMATS }
 652    },
 653    {
 654       { 4, GL_RGBA, GL_RGBA8, 0 },
 655       { PIPE_FORMAT_R8G8B8A8_UNORM, DEFAULT_RGBA_FORMATS }
 656    },
 657    {
 658       { GL_BGRA, 0 },
 659       { PIPE_FORMAT_B8G8R8A8_UNORM, DEFAULT_RGBA_FORMATS }
 660    },
 661    {
 662       { 3, GL_RGB, GL_RGB8, 0 },
 663       { DEFAULT_RGB_FORMATS }
 664    },
 665    {
 666       { GL_RGB12, GL_RGB16, GL_RGBA12, GL_RGBA16, 0 },
 667       { PIPE_FORMAT_R16G16B16A16_UNORM, DEFAULT_RGBA_FORMATS }
 668    },
 669    {
 670       { GL_RGBA4, GL_RGBA2, 0 },
 671       { PIPE_FORMAT_B4G4R4A4_UNORM, DEFAULT_RGBA_FORMATS }
 672    },
 673    {
 674       { GL_RGB5_A1, 0 },
 675       { PIPE_FORMAT_B5G5R5A1_UNORM, DEFAULT_RGBA_FORMATS }
 676    },
 677    {
 678       { GL_R3_G3_B2, 0 },
 679       { PIPE_FORMAT_B2G3R3_UNORM, PIPE_FORMAT_B5G6R5_UNORM,
 680         PIPE_FORMAT_B5G5R5A1_UNORM, DEFAULT_RGBA_FORMATS }
 681    },
 682    {
 683       { GL_RGB5, GL_RGB4 },
 684       { PIPE_FORMAT_B5G6R5_UNORM, PIPE_FORMAT_B5G5R5A1_UNORM,
 685         DEFAULT_RGBA_FORMATS }
 686    },
 687
 688    /* basic Alpha formats */
 689    {
 690       { GL_ALPHA12, GL_ALPHA16, 0 },
 691       { PIPE_FORMAT_A16_UNORM, PIPE_FORMAT_A8_UNORM,
 692         DEFAULT_RGBA_FORMATS }
 693    },
 694    {
 695       { GL_ALPHA, GL_ALPHA4, GL_ALPHA8, GL_COMPRESSED_ALPHA, 0 },
 696       { PIPE_FORMAT_A8_UNORM, DEFAULT_RGBA_FORMATS }
 697    },
 698
 699    /* basic Luminance formats */
 700    {
 701       { GL_LUMINANCE12, GL_LUMINANCE16, 0 },
 702       { PIPE_FORMAT_L16_UNORM, PIPE_FORMAT_L8_UNORM, DEFAULT_RGB_FORMATS }
 703    },
 704    {
 705       { 1, GL_LUMINANCE, GL_LUMINANCE4, GL_LUMINANCE8, 0 },
 706       { PIPE_FORMAT_L8_UNORM, DEFAULT_RGB_FORMATS }
 707    },
 708
 709    /* basic Luminance/Alpha formats */
 710    {
 711       { GL_LUMINANCE12_ALPHA4, GL_LUMINANCE12_ALPHA12,
 712         GL_LUMINANCE16_ALPHA16, 0},
 713       { PIPE_FORMAT_L16A16_UNORM, PIPE_FORMAT_L8A8_UNORM,
 714         DEFAULT_RGBA_FORMATS }
 715    },
 716    {
 717       { 2, GL_LUMINANCE_ALPHA, GL_LUMINANCE6_ALPHA2, GL_LUMINANCE8_ALPHA8, 0 },
 718       { PIPE_FORMAT_L8A8_UNORM, DEFAULT_RGBA_FORMATS }
 719    },
 720    {
 721       { GL_LUMINANCE4_ALPHA4, 0 },
 722       { PIPE_FORMAT_L4A4_UNORM, PIPE_FORMAT_L8A8_UNORM,
 723         DEFAULT_RGBA_FORMATS }
 724    },
 725
 726    /* basic Intensity formats */
 727    {
 728       { GL_INTENSITY12, GL_INTENSITY16, 0 },
 729       { PIPE_FORMAT_I16_UNORM, PIPE_FORMAT_I8_UNORM, DEFAULT_RGBA_FORMATS }
 730    },
 731    {
 732       { GL_INTENSITY, GL_INTENSITY4, GL_INTENSITY8,
 733         GL_COMPRESSED_INTENSITY, 0 },
 734       { PIPE_FORMAT_I8_UNORM, DEFAULT_RGBA_FORMATS }
 735    },
 736
 737    /* YCbCr */
 738    {
 739       { GL_YCBCR_MESA, 0 },
 740       { PIPE_FORMAT_UYVY, PIPE_FORMAT_YUYV, 0 }
 741    },
 742
 743    /* compressed formats */ /* XXX PIPE_BIND_SAMPLER_VIEW only */
 744    {
 745       { GL_COMPRESSED_RGB, 0 },
 746       { PIPE_FORMAT_DXT1_RGB, DEFAULT_RGB_FORMATS }
 747    },
 748    {
 749       { GL_COMPRESSED_RGBA, 0 },
 750       { PIPE_FORMAT_DXT5_RGBA, DEFAULT_RGBA_FORMATS }
 751    },
 752    {
 753       { GL_RGB_S3TC, GL_RGB4_S3TC, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, 0 },
 754       { PIPE_FORMAT_DXT1_RGB, 0 }
 755    },
 756    {
 757       { GL_COMPRESSED_RGBA_S3TC_DXT1_EXT, 0 },
 758       { PIPE_FORMAT_DXT1_RGBA, 0 }
 759    },
 760    {
 761       { GL_RGBA_S3TC, GL_RGBA4_S3TC, GL_COMPRESSED_RGBA_S3TC_DXT3_EXT, 0 },
 762       { PIPE_FORMAT_DXT3_RGBA, 0 }
 763    },
 764    {
 765       { GL_COMPRESSED_RGBA_S3TC_DXT5_EXT, 0 },
 766       { PIPE_FORMAT_DXT5_RGBA, 0 }
 767    },
 768
 769 #if 0
 770    {
 771       { GL_COMPRESSED_RGB_FXT1_3DFX, 0 },
 772       { PIPE_FORMAT_RGB_FXT1, 0 }
 773    },
 774    {
 775       { GL_COMPRESSED_RGBA_FXT1_3DFX, 0 },
 776       { PIPE_FORMAT_RGBA_FXT1, 0 }
 777    },
 778 #endif
 779
 780    /* Depth formats */
 781    {
 782       { GL_DEPTH_COMPONENT16, 0 },
 783       { PIPE_FORMAT_Z16_UNORM, DEFAULT_DEPTH_FORMATS }
 784    },
 785    {
 786       { GL_DEPTH_COMPONENT24, 0 },
 787       { PIPE_FORMAT_Z24X8_UNORM, PIPE_FORMAT_X8Z24_UNORM,
 788         DEFAULT_DEPTH_FORMATS }
 789    },
 790    {
 791       { GL_DEPTH_COMPONENT32, 0 },
 792       { PIPE_FORMAT_Z32_UNORM, DEFAULT_DEPTH_FORMATS }
 793    },
 794    {
 795       { GL_DEPTH_COMPONENT, 0 },
 796       { DEFAULT_DEPTH_FORMATS }
 797    },
 798    {
 799       { GL_DEPTH_COMPONENT32F, 0 },
 800       { PIPE_FORMAT_Z32_FLOAT, 0 }
 801    },
 802
 803    /* stencil formats */
 804    {
 805       { GL_STENCIL_INDEX, GL_STENCIL_INDEX1_EXT, GL_STENCIL_INDEX4_EXT,
 806         GL_STENCIL_INDEX8_EXT, GL_STENCIL_INDEX16_EXT, 0 },
 807       {
 808          PIPE_FORMAT_S8_USCALED, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 809          PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0
 810       }
 811    },
 812
 813    /* Depth / Stencil formats */
 814    {
 815       { GL_DEPTH_STENCIL_EXT, GL_DEPTH24_STENCIL8_EXT, 0 },
 816       { PIPE_FORMAT_Z24_UNORM_S8_USCALED, PIPE_FORMAT_S8_USCALED_Z24_UNORM, 0 }
 817    },
 818    {
 819       { GL_DEPTH32F_STENCIL8, 0 },
 820       { PIPE_FORMAT_Z32_FLOAT_S8X24_USCALED, 0 }
 821    },
 822
 823    /* sRGB formats */
 824    {
 825       { GL_SRGB_EXT, GL_SRGB8_EXT, GL_SRGB_ALPHA_EXT, GL_SRGB8_ALPHA8_EXT, 0 },
 826       { DEFAULT_SRGBA_FORMATS }
 827    },
 828    {
 829       { GL_COMPRESSED_SRGB_EXT, GL_COMPRESSED_SRGB_S3TC_DXT1_EXT, 0 },
 830       { PIPE_FORMAT_DXT1_SRGB, DEFAULT_SRGBA_FORMATS }
 831    },
 832    {
 833       { GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT, 0 },
 834       { PIPE_FORMAT_DXT1_SRGBA, 0 }
 835    },
 836    {
 837       { GL_COMPRESSED_SRGB_ALPHA_EXT,
 838         GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT, 0 },
 839       { PIPE_FORMAT_DXT3_SRGBA, DEFAULT_SRGBA_FORMATS }
 840    },
 841    {
 842       { GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT, 0 },
 843       { PIPE_FORMAT_DXT5_SRGBA, 0 }
 844    },
 845    {
 846       { GL_SLUMINANCE_ALPHA_EXT, GL_SLUMINANCE8_ALPHA8_EXT,
 847         GL_COMPRESSED_SLUMINANCE_EXT, GL_COMPRESSED_SLUMINANCE_ALPHA_EXT, 0 },
 848       { PIPE_FORMAT_L8A8_SRGB, DEFAULT_SRGBA_FORMATS }
 849    },
 850    {
 851       { GL_SLUMINANCE_EXT, GL_SLUMINANCE8_EXT, 0 },
 852       { PIPE_FORMAT_L8_SRGB, DEFAULT_SRGBA_FORMATS }
 853    },
 854
 855    /* 16-bit float formats */
 856    {
 857       { GL_RGBA16F_ARB, 0 },
 858       { PIPE_FORMAT_R16G16B16A16_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 859    },
 860    {
 861       { GL_RGB16F_ARB, 0 },
 862       { PIPE_FORMAT_R16G16B16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 863         PIPE_FORMAT_R32G32B32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 864    },
 865    {
 866       { GL_LUMINANCE_ALPHA16F_ARB, 0 },
 867       { PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 868         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 869    },
 870    {
 871       { GL_ALPHA16F_ARB, 0 },
 872       { PIPE_FORMAT_A16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 873         PIPE_FORMAT_A32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 874         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 875    },
 876    {
 877       { GL_INTENSITY16F_ARB, 0 },
 878       { PIPE_FORMAT_I16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 879         PIPE_FORMAT_I32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 880         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 881    },
 882    {
 883       { GL_LUMINANCE16F_ARB, 0 },
 884       { PIPE_FORMAT_L16_FLOAT, PIPE_FORMAT_L16A16_FLOAT,
 885         PIPE_FORMAT_L32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 886         PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 887    },
 888    {
 889       { GL_R16F, 0 },
 890       { PIPE_FORMAT_R16_FLOAT, PIPE_FORMAT_R16G16_FLOAT,
 891         PIPE_FORMAT_R32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 892         PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 893    },
 894    {
 895       { GL_RG16F, 0 },
 896       { PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT,
 897         PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT, 0 }
 898    },
 899
 900    /* 32-bit float formats */
 901    {
 902       { GL_RGBA32F_ARB, 0 },
 903       { PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 904    },
 905    {
 906       { GL_RGB32F_ARB, 0 },
 907       { PIPE_FORMAT_R32G32B32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 908         PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 909    },
 910    {
 911       { GL_LUMINANCE_ALPHA32F_ARB, 0 },
 912       { PIPE_FORMAT_L32A32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 913         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 914    },
 915    {
 916       { GL_ALPHA32F_ARB, 0 },
 917       { PIPE_FORMAT_A32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 918         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_A16_FLOAT,
 919         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 920    },
 921    {
 922       { GL_INTENSITY32F_ARB, 0 },
 923       { PIPE_FORMAT_I32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 924         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_I16_FLOAT,
 925         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 926    },
 927    {
 928       { GL_LUMINANCE32F_ARB, 0 },
 929       { PIPE_FORMAT_L32_FLOAT, PIPE_FORMAT_L32A32_FLOAT,
 930         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_L16_FLOAT,
 931         PIPE_FORMAT_L16A16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 932    },
 933    {
 934       { GL_R32F, 0 },
 935       { PIPE_FORMAT_R32_FLOAT, PIPE_FORMAT_R32G32_FLOAT,
 936         PIPE_FORMAT_R32G32B32A32_FLOAT, PIPE_FORMAT_R16_FLOAT,
 937         PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 938    },
 939    {
 940       { GL_RG32F, 0 },
 941       { PIPE_FORMAT_R32G32_FLOAT, PIPE_FORMAT_R32G32B32A32_FLOAT,
 942         PIPE_FORMAT_R16G16_FLOAT, PIPE_FORMAT_R16G16B16A16_FLOAT, 0 }
 943    },
 944
 945    /* R, RG formats */
 946    {
 947       { GL_RED, GL_R8, 0 },
 948       { PIPE_FORMAT_R8_UNORM, 0 }
 949    },
 950    {
 951       { GL_RG, GL_RG8, 0 },
 952       { PIPE_FORMAT_R8G8_UNORM, 0 }
 953    },
 954    {
 955       { GL_R16, 0 },
 956       { PIPE_FORMAT_R16_UNORM, 0 }
 957    },
 958    {
 959       { GL_RG16, 0 },
 960       { PIPE_FORMAT_R16G16_UNORM, 0 }
 961    },
 962
 963    /* compressed R, RG formats */
 964    {
 965       { GL_COMPRESSED_RED, GL_COMPRESSED_RED_RGTC1, 0 },
 966       { PIPE_FORMAT_RGTC1_UNORM, PIPE_FORMAT_R8_UNORM, 0 }
 967    },
 968    {
 969       { GL_COMPRESSED_SIGNED_RED_RGTC1, 0 },
 970       { PIPE_FORMAT_RGTC1_SNORM, 0 }
 971    },
 972    {
 973       { GL_COMPRESSED_RG, GL_COMPRESSED_RG_RGTC2, 0 },
 974       { PIPE_FORMAT_RGTC2_UNORM, PIPE_FORMAT_R8G8_UNORM, 0 }
 975    },
 976    {
 977       { GL_COMPRESSED_SIGNED_RG_RGTC2, 0 },
 978       { PIPE_FORMAT_RGTC2_SNORM, 0 }
 979    },
 980    {
 981       { GL_COMPRESSED_LUMINANCE, GL_COMPRESSED_LUMINANCE_LATC1_EXT, 0 },
 982       { PIPE_FORMAT_LATC1_UNORM, PIPE_FORMAT_L8_UNORM, 0 }
 983    },
 984    {
 985       { GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT, 0 },
 986       { PIPE_FORMAT_LATC1_SNORM, 0 }
 987    },
 988    {
 989       { GL_COMPRESSED_LUMINANCE_ALPHA, GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT,
 990         GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI, 0 },
 991       { PIPE_FORMAT_LATC2_UNORM, PIPE_FORMAT_L8A8_UNORM, 0 }
 992    },
 993    {
 994       { GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT, 0 },
 995       { PIPE_FORMAT_LATC2_SNORM, 0 }
 996    },
 997
 998    /* signed/unsigned integer formats.
 999     * XXX Mesa only has formats for RGBA signed/unsigned integer formats.
1000     * If/when new formats are added this code should be updated.
1001     */
1002    {
1003       { GL_RED_INTEGER_EXT,
1004         GL_GREEN_INTEGER_EXT,
1005         GL_BLUE_INTEGER_EXT,
1006         GL_ALPHA_INTEGER_EXT,
1007         GL_RGB_INTEGER_EXT,
1008         GL_RGBA_INTEGER_EXT,
1009         GL_BGR_INTEGER_EXT,
1010         GL_BGRA_INTEGER_EXT,
1011         GL_LUMINANCE_INTEGER_EXT,
1012         GL_LUMINANCE_ALPHA_INTEGER_EXT,
1013         GL_RGBA8I_EXT,
1014         GL_RGB8I_EXT,
1015         GL_ALPHA8I_EXT,
1016         GL_INTENSITY8I_EXT,
1017         GL_LUMINANCE8I_EXT,
1018         GL_LUMINANCE_ALPHA8I_EXT, 0 },
1019       { PIPE_FORMAT_R8G8B8A8_SSCALED, 0 }
1020    },
1021    {
1022       {
1023          GL_RGBA16I_EXT,
1024          GL_RGB16I_EXT,
1025          GL_ALPHA16I_EXT,
1026          GL_INTENSITY16I_EXT,
1027          GL_LUMINANCE16I_EXT,
1028          GL_LUMINANCE_ALPHA16I_EXT, 0 },
1029       { PIPE_FORMAT_R16G16B16A16_SSCALED, 0 },
1030    },
1031    {
1032       {
1033          GL_RGBA32I_EXT,
1034          GL_RGB32I_EXT,
1035          GL_ALPHA32I_EXT,
1036          GL_INTENSITY32I_EXT,
1037          GL_LUMINANCE32I_EXT,
1038          GL_LUMINANCE_ALPHA32I_EXT, 0 },
1039       { PIPE_FORMAT_R32G32B32A32_SSCALED, 0 }
1040    },
1041    {
1042       {
1043          GL_RGBA8UI_EXT,
1044          GL_RGB8UI_EXT,
1045          GL_ALPHA8UI_EXT,
1046          GL_INTENSITY8UI_EXT,
1047          GL_LUMINANCE8UI_EXT,
1048          GL_LUMINANCE_ALPHA8UI_EXT, 0 },
1049       { PIPE_FORMAT_R8G8B8A8_USCALED, 0 }
1050    },
1051    {
1052       {
1053          GL_RGBA16UI_EXT,
1054          GL_RGB16UI_EXT,
1055          GL_ALPHA16UI_EXT,
1056          GL_INTENSITY16UI_EXT,
1057          GL_LUMINANCE16UI_EXT,
1058          GL_LUMINANCE_ALPHA16UI_EXT, 0 },
1059       { PIPE_FORMAT_R16G16B16A16_USCALED, 0 }
1060    },
1061    {
1062       {
1063          GL_RGBA32UI_EXT,
1064          GL_RGB32UI_EXT,
1065          GL_ALPHA32UI_EXT,
1066          GL_INTENSITY32UI_EXT,
1067          GL_LUMINANCE32UI_EXT,
1068          GL_LUMINANCE_ALPHA32UI_EXT, 0 },
1069       { PIPE_FORMAT_R32G32B32A32_USCALED, 0 }
1070    },
1071
1072    /* signed normalized formats */
1073    {
1074       { GL_RED_SNORM, GL_R8_SNORM, 0 },
1075       { PIPE_FORMAT_R8_SNORM, PIPE_FORMAT_R8G8_SNORM,
1076         PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1077    },
1078    {
1079       { GL_R16_SNORM, 0 },
1080       { PIPE_FORMAT_R16_SNORM,
1081         PIPE_FORMAT_R16G16_SNORM,
1082         PIPE_FORMAT_R16G16B16A16_SNORM,
1083         PIPE_FORMAT_R8_SNORM,
1084         PIPE_FORMAT_R8G8_SNORM,
1085         PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1086    },
1087    {
1088       { GL_RG_SNORM, GL_RG8_SNORM, 0 },
1089       { PIPE_FORMAT_R8G8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1090    },
1091    {
1092       { GL_RG16_SNORM, 0 },
1093       { PIPE_FORMAT_R16G16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1094         PIPE_FORMAT_R8G8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1095    },
1096    {
1097       { GL_RGB_SNORM, GL_RGB8_SNORM, GL_RGBA_SNORM, GL_RGBA8_SNORM, 0 },
1098       { PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1099    },
1100    {
1101       { GL_RGB16_SNORM, GL_RGBA16_SNORM, 0 },
1102       { PIPE_FORMAT_R16G16B16A16_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1103    },
1104    {
1105       { GL_ALPHA_SNORM, GL_ALPHA8_SNORM, 0 },
1106       { PIPE_FORMAT_A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1107    },
1108    {
1109       { GL_ALPHA16_SNORM, 0 },
1110       { PIPE_FORMAT_A16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1111         PIPE_FORMAT_A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1112    },
1113    {
1114       { GL_LUMINANCE_SNORM, GL_LUMINANCE8_SNORM, 0 },
1115       { PIPE_FORMAT_L8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1116    },
1117    {
1118       { GL_LUMINANCE16_SNORM, 0 },
1119       { PIPE_FORMAT_L16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1120         PIPE_FORMAT_L8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1121    },
1122    {
1123       { GL_LUMINANCE_ALPHA_SNORM, GL_LUMINANCE8_ALPHA8_SNORM, 0 },
1124       { PIPE_FORMAT_L8A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1125    },
1126    {
1127       { GL_LUMINANCE16_ALPHA16_SNORM, 0 },
1128       { PIPE_FORMAT_L16A16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1129         PIPE_FORMAT_L8A8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1130    },
1131    {
1132       { GL_INTENSITY_SNORM, GL_INTENSITY8_SNORM, 0 },
1133       { PIPE_FORMAT_I8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1134    },
1135    {
1136       { GL_INTENSITY16_SNORM, 0 },
1137       { PIPE_FORMAT_I16_SNORM, PIPE_FORMAT_R16G16B16A16_SNORM,
1138         PIPE_FORMAT_I8_SNORM, PIPE_FORMAT_R8G8B8A8_SNORM, 0 }
1139    },
1140    {
1141       { GL_RGB9_E5, 0 },
1142       { PIPE_FORMAT_R9G9B9E5_FLOAT, 0 }
1143    },
1144    {
1145       { GL_R11F_G11F_B10F, 0 },
1146       { PIPE_FORMAT_R11G11B10_FLOAT, 0 }
1147    }
1148 };
1149
1150
1151 /**
1152  * Return first supported format from the given list.
1153  */
1154 static enum pipe_format
1155 find_supported_format(struct pipe_screen *screen,
1156                       const enum pipe_format formats[],
1157                       enum pipe_texture_target target,
1158                       unsigned sample_count,
1159                       unsigned tex_usage)
1160 {
1161    uint i;
1162    for (i = 0; formats[i]; i++) {
1163       if (screen->is_format_supported(screen, formats[i], target,
1164                                       sample_count, tex_usage)) {
1165          return formats[i];
1166       }
1167    }
1168    return PIPE_FORMAT_NONE;
1169 }
1170
1171 struct exact_format_mapping
1172 {
1173    GLenum format;
1174    GLenum type;
1175    enum pipe_format pformat;
1176 };
1177
1178 static const struct exact_format_mapping rgba8888_tbl[] =
1179 {
1180    { GL_RGBA,     GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_A8B8G8R8_UNORM },
1181    { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_A8B8G8R8_UNORM },
1182    { GL_RGBA,     GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_R8G8B8A8_UNORM },
1183    { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_R8G8B8A8_UNORM },
1184    { GL_BGRA,     GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_A8R8G8B8_UNORM },
1185    { GL_BGRA,     GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_B8G8R8A8_UNORM },
1186    { GL_RGBA,     GL_UNSIGNED_BYTE,               PIPE_FORMAT_R8G8B8A8_UNORM },
1187    { GL_ABGR_EXT, GL_UNSIGNED_BYTE,               PIPE_FORMAT_A8B8G8R8_UNORM },
1188    { GL_BGRA,     GL_UNSIGNED_BYTE,               PIPE_FORMAT_B8G8R8A8_UNORM },
1189    { 0,           0,                              0                          }
1190 };
1191
1192 static const struct exact_format_mapping rgbx8888_tbl[] =
1193 {
1194    { GL_BGRA,     GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_X8R8G8B8_UNORM },
1195    { GL_BGRA,     GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_B8G8R8X8_UNORM },
1196    { GL_BGRA,     GL_UNSIGNED_BYTE,               PIPE_FORMAT_B8G8R8X8_UNORM },
1197    /* No Mesa formats for these Gallium formats:
1198    { GL_RGBA,     GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_X8B8G8R8_UNORM },
1199    { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_X8B8G8R8_UNORM },
1200    { GL_RGBA,     GL_UNSIGNED_INT_8_8_8_8_REV,    PIPE_FORMAT_R8G8B8X8_UNORM },
1201    { GL_ABGR_EXT, GL_UNSIGNED_INT_8_8_8_8,        PIPE_FORMAT_R8G8B8X8_UNORM },
1202    { GL_RGBA,     GL_UNSIGNED_BYTE,               PIPE_FORMAT_R8G8B8X8_UNORM },
1203    { GL_ABGR_EXT, GL_UNSIGNED_BYTE,               PIPE_FORMAT_X8B8G8R8_UNORM },
1204    */
1205    { 0,           0,                              0                          }
1206 };
1207
1208 static const struct exact_format_mapping rgba1010102_tbl[] =
1209 {
1210    { GL_BGRA,     GL_UNSIGNED_INT_2_10_10_10_REV, PIPE_FORMAT_B10G10R10A2_UNORM },
1211    /* No Mesa formats for these Gallium formats:
1212    { GL_RGBA,     GL_UNSIGNED_INT_2_10_10_10_REV, PIPE_FORMAT_R10G10B10A2_UNORM },
1213    { GL_ABGR_EXT, GL_UNSIGNED_INT_10_10_10_2,     PIPE_FORMAT_R10G10B10A2_UNORM },
1214    { GL_ABGR_EXT, GL_UNSIGNED_INT,                PIPE_FORMAT_R10G10B10A2_UNORM },
1215    */
1216    { 0,           0,                              0                             }
1217 };
1218
1219 /**
1220  * If there is an exact pipe_format match for {internalFormat, format, type}
1221  * return that, otherwise return PIPE_FORMAT_NONE so we can do fuzzy matching.
1222  */
1223 static enum pipe_format
1224 find_exact_format(GLint internalFormat, GLenum format, GLenum type)
1225 {
1226    uint i;
1227    const struct exact_format_mapping* tbl;
1228
1229    if (format == GL_NONE || type == GL_NONE)
1230       return PIPE_FORMAT_NONE;
1231
1232    switch (internalFormat) {
1233    case 4:
1234    case GL_RGBA:
1235    case GL_RGBA8:
1236       tbl = rgba8888_tbl;
1237       break;
1238    case 3:
1239    case GL_RGB:
1240    case GL_RGB8:
1241       tbl = rgbx8888_tbl;
1242       break;
1243    case GL_RGB10_A2:
1244       tbl = rgba1010102_tbl;
1245       break;
1246    default:
1247       return PIPE_FORMAT_NONE;
1248    }
1249
1250    for (i = 0; tbl[i].format; i++)
1251       if (tbl[i].format == format && tbl[i].type == type)
1252          return tbl[i].pformat;
1253
1254    return PIPE_FORMAT_NONE;
1255 }
1256
1257 /**
1258  * Given an OpenGL internalFormat value for a texture or surface, return
1259  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
1260  * This is called during glTexImage2D, for example.
1261  *
1262  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
1263  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
1264  * we want render-to-texture ability.
1265  *
1266  * \param internalFormat  the user value passed to glTexImage2D
1267  * \param target  one of PIPE_TEXTURE_x
1268  * \param bindings  bitmask of PIPE_BIND_x flags.
1269  */
1270 enum pipe_format
1271 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
1272                  GLenum format, GLenum type,
1273                  enum pipe_texture_target target, unsigned sample_count,
1274                  unsigned bindings)
1275 {
1276    GET_CURRENT_CONTEXT(ctx); /* XXX this should be a function parameter */
1277    int i, j;
1278    enum pipe_format pf;
1279
1280    /* can't render to compressed formats at this time */
1281    if (_mesa_is_compressed_format(ctx, internalFormat)
1282        && (bindings & ~PIPE_BIND_SAMPLER_VIEW)) {
1283       return PIPE_FORMAT_NONE;
1284    }
1285
1286    /* search for exact matches */
1287    pf = find_exact_format(internalFormat, format, type);
1288    if (pf != PIPE_FORMAT_NONE &&
1289        screen->is_format_supported(screen, pf,
1290                                    target, sample_count, bindings))
1291       return pf;
1292
1293    /* search table for internalFormat */
1294    for (i = 0; i < Elements(format_map); i++) {
1295       const struct format_mapping *mapping = &format_map[i];
1296       for (j = 0; mapping->glFormats[j]; j++) {
1297          if (mapping->glFormats[j] == internalFormat) {
1298             /* Found the desired internal format.  Find first pipe format
1299              * which is supported by the driver.
1300              */
1301             return find_supported_format(screen, mapping->pipeFormats,
1302                                          target, sample_count, bindings);
1303          }
1304       }
1305    }
1306
1307    _mesa_problem(NULL, "unhandled format!\n");
1308    return PIPE_FORMAT_NONE;
1309 }
1310
1311
1312 /**
1313  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
1314  */
1315 enum pipe_format
1316 st_choose_renderbuffer_format(struct pipe_screen *screen,
1317                               GLenum internalFormat, unsigned sample_count)
1318 {
1319    uint usage;
1320    if (_mesa_is_depth_or_stencil_format(internalFormat))
1321       usage = PIPE_BIND_DEPTH_STENCIL;
1322    else
1323       usage = PIPE_BIND_RENDER_TARGET;
1324    return st_choose_format(screen, internalFormat, GL_NONE, GL_NONE, PIPE_TEXTURE_2D,
1325                            sample_count, usage);
1326 }
1327
1328
1329 gl_format
1330 st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,
1331                                   GLenum format, GLenum type, GLboolean renderable)
1332 {
1333    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
1334    enum pipe_format pFormat;
1335    uint bindings;
1336
1337    (void) format;
1338    (void) type;
1339
1340    /* GL textures may wind up being render targets, but we don't know
1341     * that in advance.  Specify potential render target flags now.
1342     */
1343    bindings = PIPE_BIND_SAMPLER_VIEW;
1344    if (renderable) {
1345       if (_mesa_is_depth_or_stencil_format(internalFormat))
1346          bindings |= PIPE_BIND_DEPTH_STENCIL;
1347       else
1348          bindings |= PIPE_BIND_RENDER_TARGET;
1349    }
1350
1351    pFormat = st_choose_format(screen, internalFormat, format, type,
1352                               PIPE_TEXTURE_2D, 0, bindings);
1353
1354    if (pFormat == PIPE_FORMAT_NONE) {
1355       /* try choosing format again, this time without render target bindings */
1356       pFormat = st_choose_format(screen, internalFormat, format, type,
1357                                  PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
1358    }
1359
1360    if (pFormat == PIPE_FORMAT_NONE) {
1361       /* no luck at all */
1362       return MESA_FORMAT_NONE;
1363    }
1364
1365    return st_pipe_format_to_mesa_format(pFormat);
1366 }
1367
1368
1369 /**
1370  * Called via ctx->Driver.ChooseTextureFormat().
1371  */
1372 gl_format
1373 st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
1374                        GLenum format, GLenum type)
1375 {
1376    boolean want_renderable =
1377       internalFormat == 3 || internalFormat == 4 ||
1378       internalFormat == GL_RGB || internalFormat == GL_RGBA ||
1379       internalFormat == GL_RGB8 || internalFormat == GL_RGBA8 ||
1380       internalFormat == GL_BGRA;
1381
1382    return st_ChooseTextureFormat_renderable(ctx, internalFormat,
1383                                             format, type, want_renderable);
1384 }
1385
1386 /**
1387  * Test if a gallium format is equivalent to a GL format/type.
1388  */
1389 GLboolean
1390 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
1391 {
1392    switch (pFormat) {
1393    case PIPE_FORMAT_A8B8G8R8_UNORM:
1394       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
1395    case PIPE_FORMAT_A8R8G8B8_UNORM:
1396       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
1397    case PIPE_FORMAT_B5G6R5_UNORM:
1398       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
1399    /* XXX more combos... */
1400    default:
1401       return GL_FALSE;
1402    }
1403 }
1404
1405 GLboolean
1406 st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
1407 {
1408    if (format1 == format2)
1409       return GL_TRUE;
1410
1411    if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
1412        format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
1413       return GL_TRUE;
1414
1415    if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
1416        format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
1417       return GL_TRUE;
1418
1419    if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
1420        format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
1421       return GL_TRUE;
1422
1423    if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
1424        format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
1425       return GL_TRUE;
1426
1427    if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
1428        format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
1429       return GL_TRUE;
1430
1431    if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
1432        format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
1433       return GL_TRUE;
1434
1435    return GL_FALSE;
1436 }
1437
1438
1439
1440 /**
1441  * This is used for translating texture border color and the clear
1442  * color.  For example, the clear color is interpreted according to
1443  * the renderbuffer's base format.  For example, if clearing a
1444  * GL_LUMINANCE buffer, ClearColor[0] = luminance and ClearColor[1] =
1445  * alpha.  Similarly for texture border colors.
1446  */
1447 void
1448 st_translate_color(const GLfloat colorIn[4], GLenum baseFormat,
1449                    GLfloat colorOut[4])
1450 {
1451    switch (baseFormat) {
1452    case GL_RED:
1453       colorOut[0] = colorIn[0];
1454       colorOut[1] = 0.0F;
1455       colorOut[2] = 0.0F;
1456       colorOut[3] = 1.0F;
1457       break;
1458    case GL_RG:
1459       colorOut[0] = colorIn[0];
1460       colorOut[1] = colorIn[1];
1461       colorOut[2] = 0.0F;
1462       colorOut[3] = 1.0F;
1463       break;
1464    case GL_RGB:
1465       colorOut[0] = colorIn[0];
1466       colorOut[1] = colorIn[1];
1467       colorOut[2] = colorIn[2];
1468       colorOut[3] = 1.0F;
1469       break;
1470    case GL_ALPHA:
1471       colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
1472       colorOut[3] = colorIn[3];
1473       break;
1474    case GL_LUMINANCE:
1475       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1476       colorOut[3] = 1.0;
1477       break;
1478    case GL_LUMINANCE_ALPHA:
1479       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1480       colorOut[3] = colorIn[3];
1481       break;
1482    case GL_INTENSITY:
1483       colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
1484       break;
1485    default:
1486       COPY_4V(colorOut, colorIn);
1487    }
1488 }