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    default:
 329       assert(0);
 330       return PIPE_FORMAT_NONE;
 331    }
 332 }
 333
 334
 335 /**
 336  * Translate Gallium format to Mesa format.
 337  */
 338 gl_format
 339 st_pipe_format_to_mesa_format(enum pipe_format format)
 340 {
 341    switch (format) {
 342    case PIPE_FORMAT_A8B8G8R8_UNORM:
 343       return MESA_FORMAT_RGBA8888;
 344    case PIPE_FORMAT_R8G8B8A8_UNORM:
 345       return MESA_FORMAT_RGBA8888_REV;
 346    case PIPE_FORMAT_B8G8R8A8_UNORM:
 347       return MESA_FORMAT_ARGB8888;
 348    case PIPE_FORMAT_A8R8G8B8_UNORM:
 349       return MESA_FORMAT_ARGB8888_REV;
 350    case PIPE_FORMAT_B8G8R8X8_UNORM:
 351       return MESA_FORMAT_XRGB8888;
 352    case PIPE_FORMAT_X8R8G8B8_UNORM:
 353       return MESA_FORMAT_XRGB8888_REV;
 354    case PIPE_FORMAT_B5G5R5A1_UNORM:
 355       return MESA_FORMAT_ARGB1555;
 356    case PIPE_FORMAT_B4G4R4A4_UNORM:
 357       return MESA_FORMAT_ARGB4444;
 358    case PIPE_FORMAT_B5G6R5_UNORM:
 359       return MESA_FORMAT_RGB565;
 360    case PIPE_FORMAT_B2G3R3_UNORM:
 361       return MESA_FORMAT_RGB332;
 362    case PIPE_FORMAT_B10G10R10A2_UNORM:
 363       return MESA_FORMAT_ARGB2101010;
 364    case PIPE_FORMAT_L4A4_UNORM:
 365       return MESA_FORMAT_AL44;
 366    case PIPE_FORMAT_L8A8_UNORM:
 367       return MESA_FORMAT_AL88;
 368    case PIPE_FORMAT_L16A16_UNORM:
 369       return MESA_FORMAT_AL1616;
 370    case PIPE_FORMAT_A8_UNORM:
 371       return MESA_FORMAT_A8;
 372    case PIPE_FORMAT_A16_UNORM:
 373       return MESA_FORMAT_A16;
 374    case PIPE_FORMAT_L8_UNORM:
 375       return MESA_FORMAT_L8;
 376    case PIPE_FORMAT_L16_UNORM:
 377       return MESA_FORMAT_L16;
 378    case PIPE_FORMAT_I8_UNORM:
 379       return MESA_FORMAT_I8;
 380    case PIPE_FORMAT_I16_UNORM:
 381       return MESA_FORMAT_I16;
 382    case PIPE_FORMAT_S8_USCALED:
 383       return MESA_FORMAT_S8;
 384
 385    case PIPE_FORMAT_R16G16B16A16_UNORM:
 386       return MESA_FORMAT_RGBA_16;
 387
 388    case PIPE_FORMAT_Z16_UNORM:
 389       return MESA_FORMAT_Z16;
 390    case PIPE_FORMAT_Z32_UNORM:
 391       return MESA_FORMAT_Z32;
 392    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 393       return MESA_FORMAT_Z24_S8;
 394    case PIPE_FORMAT_X8Z24_UNORM:
 395       return MESA_FORMAT_Z24_X8;
 396    case PIPE_FORMAT_Z24X8_UNORM:
 397       return MESA_FORMAT_X8_Z24;
 398    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 399       return MESA_FORMAT_S8_Z24;
 400
 401    case PIPE_FORMAT_UYVY:
 402       return MESA_FORMAT_YCBCR;
 403    case PIPE_FORMAT_YUYV:
 404       return MESA_FORMAT_YCBCR_REV;
 405
 406 #if FEATURE_texture_s3tc
 407    case PIPE_FORMAT_DXT1_RGB:
 408       return MESA_FORMAT_RGB_DXT1;
 409    case PIPE_FORMAT_DXT1_RGBA:
 410       return MESA_FORMAT_RGBA_DXT1;
 411    case PIPE_FORMAT_DXT3_RGBA:
 412       return MESA_FORMAT_RGBA_DXT3;
 413    case PIPE_FORMAT_DXT5_RGBA:
 414       return MESA_FORMAT_RGBA_DXT5;
 415 #if FEATURE_EXT_texture_sRGB
 416    case PIPE_FORMAT_DXT1_SRGB:
 417       return MESA_FORMAT_SRGB_DXT1;
 418    case PIPE_FORMAT_DXT1_SRGBA:
 419       return MESA_FORMAT_SRGBA_DXT1;
 420    case PIPE_FORMAT_DXT3_SRGBA:
 421       return MESA_FORMAT_SRGBA_DXT3;
 422    case PIPE_FORMAT_DXT5_SRGBA:
 423       return MESA_FORMAT_SRGBA_DXT5;
 424 #endif
 425 #endif
 426
 427 #if FEATURE_EXT_texture_sRGB
 428    case PIPE_FORMAT_L8A8_SRGB:
 429       return MESA_FORMAT_SLA8;
 430    case PIPE_FORMAT_L8_SRGB:
 431       return MESA_FORMAT_SL8;
 432    case PIPE_FORMAT_R8G8B8_SRGB:
 433       return MESA_FORMAT_SRGB8;
 434    case PIPE_FORMAT_A8B8G8R8_SRGB:
 435       return MESA_FORMAT_SRGBA8;
 436    case PIPE_FORMAT_B8G8R8A8_SRGB:
 437       return MESA_FORMAT_SARGB8;
 438 #endif
 439    case PIPE_FORMAT_R32G32B32A32_FLOAT:
 440       return MESA_FORMAT_RGBA_FLOAT32;
 441    case PIPE_FORMAT_R16G16B16A16_FLOAT:
 442       return MESA_FORMAT_RGBA_FLOAT16;
 443    case PIPE_FORMAT_R32G32B32_FLOAT:
 444       return MESA_FORMAT_RGB_FLOAT32;
 445    case PIPE_FORMAT_R16G16B16_FLOAT:
 446       return MESA_FORMAT_RGB_FLOAT16;
 447    case PIPE_FORMAT_L32A32_FLOAT:
 448       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32;
 449    case PIPE_FORMAT_L16A16_FLOAT:
 450       return MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16;
 451    case PIPE_FORMAT_L32_FLOAT:
 452       return MESA_FORMAT_LUMINANCE_FLOAT32;
 453    case PIPE_FORMAT_L16_FLOAT:
 454       return MESA_FORMAT_LUMINANCE_FLOAT16;
 455    case PIPE_FORMAT_A32_FLOAT:
 456       return MESA_FORMAT_ALPHA_FLOAT32;
 457    case PIPE_FORMAT_A16_FLOAT:
 458       return MESA_FORMAT_ALPHA_FLOAT16;
 459    case PIPE_FORMAT_I32_FLOAT:
 460       return MESA_FORMAT_INTENSITY_FLOAT32;
 461    case PIPE_FORMAT_I16_FLOAT:
 462       return MESA_FORMAT_INTENSITY_FLOAT16;
 463    case PIPE_FORMAT_R32_FLOAT:
 464       return MESA_FORMAT_R_FLOAT32;
 465    case PIPE_FORMAT_R16_FLOAT:
 466       return MESA_FORMAT_R_FLOAT16;
 467    case PIPE_FORMAT_R32G32_FLOAT:
 468       return MESA_FORMAT_RG_FLOAT32;
 469    case PIPE_FORMAT_R16G16_FLOAT:
 470       return MESA_FORMAT_RG_FLOAT16;
 471
 472    case PIPE_FORMAT_R8_UNORM:
 473       return MESA_FORMAT_R8;
 474    case PIPE_FORMAT_R16_UNORM:
 475       return MESA_FORMAT_R16;
 476    case PIPE_FORMAT_R8G8_UNORM:
 477       return MESA_FORMAT_RG88;
 478    case PIPE_FORMAT_R16G16_UNORM:
 479       return MESA_FORMAT_RG1616;
 480
 481    /* signed int formats */
 482    case PIPE_FORMAT_R8G8B8A8_SSCALED:
 483       return MESA_FORMAT_RGBA_INT8;
 484    case PIPE_FORMAT_R16G16B16A16_SSCALED:
 485       return MESA_FORMAT_RGBA_INT16;
 486    case PIPE_FORMAT_R32G32B32A32_SSCALED:
 487       return MESA_FORMAT_RGBA_INT32;
 488
 489    /* unsigned int formats */
 490    case PIPE_FORMAT_R8G8B8A8_USCALED:
 491       return MESA_FORMAT_RGBA_UINT8;
 492    case PIPE_FORMAT_R16G16B16A16_USCALED:
 493       return MESA_FORMAT_RGBA_UINT16;
 494    case PIPE_FORMAT_R32G32B32A32_USCALED:
 495       return MESA_FORMAT_RGBA_UINT32;
 496
 497    case PIPE_FORMAT_RGTC1_UNORM:
 498       return MESA_FORMAT_RED_RGTC1;
 499    case PIPE_FORMAT_RGTC1_SNORM:
 500       return MESA_FORMAT_SIGNED_RED_RGTC1;
 501    case PIPE_FORMAT_RGTC2_UNORM:
 502       return MESA_FORMAT_RG_RGTC2;
 503    case PIPE_FORMAT_RGTC2_SNORM:
 504       return MESA_FORMAT_SIGNED_RG_RGTC2;
 505
 506    case PIPE_FORMAT_LATC1_UNORM:
 507       return MESA_FORMAT_L_LATC1;
 508    case PIPE_FORMAT_LATC1_SNORM:
 509       return MESA_FORMAT_SIGNED_L_LATC1;
 510    case PIPE_FORMAT_LATC2_UNORM:
 511       return MESA_FORMAT_LA_LATC2;
 512    case PIPE_FORMAT_LATC2_SNORM:
 513       return MESA_FORMAT_SIGNED_LA_LATC2;
 514
 515    /* signed normalized formats */
 516    case PIPE_FORMAT_R8_SNORM:
 517       return MESA_FORMAT_SIGNED_R8;
 518    case PIPE_FORMAT_R8G8_SNORM:
 519       return MESA_FORMAT_SIGNED_RG88_REV;
 520    case PIPE_FORMAT_R8G8B8A8_SNORM:
 521       return MESA_FORMAT_SIGNED_RGBA8888_REV;
 522
 523    case PIPE_FORMAT_A8_SNORM:
 524       return MESA_FORMAT_SIGNED_A8;
 525    case PIPE_FORMAT_L8_SNORM:
 526       return MESA_FORMAT_SIGNED_L8;
 527    case PIPE_FORMAT_L8A8_SNORM:
 528       return MESA_FORMAT_SIGNED_AL88;
 529    case PIPE_FORMAT_I8_SNORM:
 530       return MESA_FORMAT_SIGNED_I8;
 531
 532    case PIPE_FORMAT_R16_SNORM:
 533       return MESA_FORMAT_SIGNED_R16;
 534    case PIPE_FORMAT_R16G16_SNORM:
 535       return MESA_FORMAT_SIGNED_GR1616;
 536    case PIPE_FORMAT_R16G16B16A16_SNORM:
 537       return MESA_FORMAT_SIGNED_RGBA_16;
 538
 539    case PIPE_FORMAT_A16_SNORM:
 540       return MESA_FORMAT_SIGNED_A16;
 541    case PIPE_FORMAT_L16_SNORM:
 542       return MESA_FORMAT_SIGNED_L16;
 543    case PIPE_FORMAT_L16A16_SNORM:
 544       return MESA_FORMAT_SIGNED_AL1616;
 545    case PIPE_FORMAT_I16_SNORM:
 546       return MESA_FORMAT_SIGNED_I16;
 547
 548    default:
 549       assert(0);
 550       return MESA_FORMAT_NONE;
 551    }
 552 }
 553
 554
 555 /**
 556  * Return first supported format from the given list.
 557  */
 558 static enum pipe_format
 559 find_supported_format(struct pipe_screen *screen,
 560                       const enum pipe_format formats[],
 561                       uint num_formats,
 562                       enum pipe_texture_target target,
 563                       unsigned sample_count,
 564                       unsigned tex_usage)
 565 {
 566    uint i;
 567    for (i = 0; i < num_formats; i++) {
 568       if (screen->is_format_supported(screen, formats[i], target,
 569                                       sample_count, tex_usage)) {
 570          return formats[i];
 571       }
 572    }
 573    return PIPE_FORMAT_NONE;
 574 }
 575
 576
 577 /**
 578  * Find an RGBA format supported by the context/winsys.
 579  */
 580 static enum pipe_format
 581 default_rgba_format(struct pipe_screen *screen,
 582                     enum pipe_texture_target target,
 583                     unsigned sample_count,
 584                     unsigned tex_usage)
 585 {
 586    static const enum pipe_format colorFormats[] = {
 587       PIPE_FORMAT_B8G8R8A8_UNORM,
 588       PIPE_FORMAT_A8R8G8B8_UNORM,
 589       PIPE_FORMAT_A8B8G8R8_UNORM,
 590       PIPE_FORMAT_B5G6R5_UNORM
 591    };
 592    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 593                                 target, sample_count, tex_usage);
 594 }
 595
 596
 597 /**
 598  * Find an RGB format supported by the context/winsys.
 599  */
 600 static enum pipe_format
 601 default_rgb_format(struct pipe_screen *screen,
 602                    enum pipe_texture_target target,
 603                    unsigned sample_count,
 604                    unsigned tex_usage)
 605 {
 606    static const enum pipe_format colorFormats[] = {
 607       PIPE_FORMAT_B8G8R8X8_UNORM,
 608       PIPE_FORMAT_X8R8G8B8_UNORM,
 609       PIPE_FORMAT_X8B8G8R8_UNORM,
 610       PIPE_FORMAT_B8G8R8A8_UNORM,
 611       PIPE_FORMAT_A8R8G8B8_UNORM,
 612       PIPE_FORMAT_A8B8G8R8_UNORM,
 613       PIPE_FORMAT_B5G6R5_UNORM
 614    };
 615    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 616                                 target, sample_count, tex_usage);
 617 }
 618
 619 /**
 620  * Find an sRGBA format supported by the context/winsys.
 621  */
 622 static enum pipe_format
 623 default_srgba_format(struct pipe_screen *screen,
 624                     enum pipe_texture_target target,
 625                     unsigned sample_count,
 626                     unsigned tex_usage)
 627 {
 628    static const enum pipe_format colorFormats[] = {
 629       PIPE_FORMAT_B8G8R8A8_SRGB,
 630       PIPE_FORMAT_A8R8G8B8_SRGB,
 631       PIPE_FORMAT_A8B8G8R8_SRGB,
 632    };
 633    return find_supported_format(screen, colorFormats, Elements(colorFormats),
 634                                 target, sample_count, tex_usage);
 635 }
 636
 637
 638 /**
 639  * Given an OpenGL internalFormat value for a texture or surface, return
 640  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 641  * This is called during glTexImage2D, for example.
 642  *
 643  * The bindings parameter typically has PIPE_BIND_SAMPLER_VIEW set, plus
 644  * either PIPE_BINDING_RENDER_TARGET or PIPE_BINDING_DEPTH_STENCIL if
 645  * we want render-to-texture ability.
 646  *
 647  * \param internalFormat  the user value passed to glTexImage2D
 648  * \param target  one of PIPE_TEXTURE_x
 649  * \param bindings  bitmask of PIPE_BIND_x flags.
 650  */
 651 enum pipe_format
 652 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 653                  enum pipe_texture_target target, unsigned sample_count,
 654                  unsigned bindings)
 655 {
 656
 657    switch (internalFormat) {
 658    case GL_RGB10:
 659    case GL_RGB10_A2:
 660       if (screen->is_format_supported( screen, PIPE_FORMAT_B10G10R10A2_UNORM,
 661                                        target, sample_count, bindings))
 662          return PIPE_FORMAT_B10G10R10A2_UNORM;
 663       /* Pass through. */
 664    case 4:
 665    case GL_RGBA:
 666    case GL_RGBA8:
 667       return default_rgba_format( screen, target, sample_count, bindings);
 668
 669    case GL_BGRA:
 670       if (screen->is_format_supported( screen, PIPE_FORMAT_B8G8R8A8_UNORM,
 671                                        target, sample_count, bindings))
 672          return PIPE_FORMAT_B8G8R8A8_UNORM;
 673       return default_rgba_format( screen, target, sample_count, bindings);
 674
 675    case 3:
 676    case GL_RGB:
 677    case GL_RGB8:
 678       return default_rgb_format( screen, target, sample_count, bindings);
 679
 680    case GL_RGB12:
 681    case GL_RGB16:
 682    case GL_RGBA12:
 683    case GL_RGBA16:
 684       if (screen->is_format_supported( screen, PIPE_FORMAT_R16G16B16A16_UNORM,
 685                                              target, sample_count, bindings))
 686          return PIPE_FORMAT_R16G16B16A16_UNORM;
 687       return default_rgba_format( screen, target, sample_count, bindings);
 688
 689    case GL_RGBA4:
 690    case GL_RGBA2:
 691       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM,
 692                                        target, sample_count, bindings))
 693          return PIPE_FORMAT_B4G4R4A4_UNORM;
 694       return default_rgba_format( screen, target, sample_count, bindings);
 695
 696    case GL_RGB5_A1:
 697       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 698                                        target, sample_count, bindings))
 699          return PIPE_FORMAT_B5G5R5A1_UNORM;
 700       return default_rgba_format( screen, target, sample_count, bindings);
 701
 702    case GL_R3_G3_B2:
 703       if (screen->is_format_supported( screen, PIPE_FORMAT_B2G3R3_UNORM,
 704                                        target, sample_count, bindings))
 705          return PIPE_FORMAT_B2G3R3_UNORM;
 706       /* Pass through. */
 707    case GL_RGB5:
 708    case GL_RGB4:
 709       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM,
 710                                        target, sample_count, bindings))
 711          return PIPE_FORMAT_B5G6R5_UNORM;
 712       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM,
 713                                        target, sample_count, bindings))
 714          return PIPE_FORMAT_B5G5R5A1_UNORM;
 715       return default_rgba_format( screen, target, sample_count, bindings);
 716
 717    case GL_ALPHA12:
 718    case GL_ALPHA16:
 719       if (screen->is_format_supported( screen, PIPE_FORMAT_A16_UNORM, target,
 720                                        sample_count, bindings))
 721          return PIPE_FORMAT_A16_UNORM;
 722       /* Pass through. */
 723    case GL_ALPHA:
 724    case GL_ALPHA4:
 725    case GL_ALPHA8:
 726    case GL_COMPRESSED_ALPHA:
 727       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target,
 728                                        sample_count, bindings))
 729          return PIPE_FORMAT_A8_UNORM;
 730       return default_rgba_format( screen, target, sample_count, bindings);
 731
 732    case GL_LUMINANCE12:
 733    case GL_LUMINANCE16:
 734       if (screen->is_format_supported( screen, PIPE_FORMAT_L16_UNORM, target,
 735                                        sample_count, bindings))
 736          return PIPE_FORMAT_L16_UNORM;
 737       /* Pass through. */
 738    case 1:
 739    case GL_LUMINANCE:
 740    case GL_LUMINANCE4:
 741    case GL_LUMINANCE8:
 742       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target,
 743                                        sample_count, bindings))
 744          return PIPE_FORMAT_L8_UNORM;
 745       return default_rgba_format( screen, target, sample_count, bindings);
 746
 747    case GL_LUMINANCE12_ALPHA4:
 748    case GL_LUMINANCE12_ALPHA12:
 749    case GL_LUMINANCE16_ALPHA16:
 750       if (screen->is_format_supported( screen, PIPE_FORMAT_L16A16_UNORM, target,
 751                                        sample_count, bindings))
 752          return PIPE_FORMAT_L16A16_UNORM;
 753       /* Pass through. */
 754    case 2:
 755    case GL_LUMINANCE_ALPHA:
 756    case GL_LUMINANCE6_ALPHA2:
 757    case GL_LUMINANCE8_ALPHA8:
 758       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
 759                                        sample_count, bindings))
 760          return PIPE_FORMAT_L8A8_UNORM;
 761       return default_rgba_format( screen, target, sample_count, bindings);
 762
 763    case GL_LUMINANCE4_ALPHA4:
 764       if (screen->is_format_supported( screen, PIPE_FORMAT_L4A4_UNORM, target,
 765                                        sample_count, bindings))
 766          return PIPE_FORMAT_L4A4_UNORM;
 767       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target,
 768                                        sample_count, bindings))
 769          return PIPE_FORMAT_L8A8_UNORM;
 770       return default_rgba_format( screen, target, sample_count, bindings);
 771
 772    case GL_INTENSITY12:
 773    case GL_INTENSITY16:
 774       if (screen->is_format_supported( screen, PIPE_FORMAT_I16_UNORM, target,
 775                                        sample_count, bindings))
 776          return PIPE_FORMAT_I16_UNORM;
 777       /* Pass through. */
 778    case GL_INTENSITY:
 779    case GL_INTENSITY4:
 780    case GL_INTENSITY8:
 781    case GL_COMPRESSED_INTENSITY:
 782       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target,
 783                                        sample_count, bindings))
 784          return PIPE_FORMAT_I8_UNORM;
 785       return default_rgba_format( screen, target, sample_count, bindings);
 786
 787    case GL_YCBCR_MESA:
 788       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY, target,
 789                                       sample_count, bindings)) {
 790          return PIPE_FORMAT_UYVY;
 791       }
 792       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV, target,
 793                                       sample_count, bindings)) {
 794          return PIPE_FORMAT_YUYV;
 795       }
 796       return PIPE_FORMAT_NONE;
 797
 798    case GL_COMPRESSED_RGB:
 799       /* can only sample from compressed formats */
 800       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 801          return PIPE_FORMAT_NONE;
 802       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 803                                            target, sample_count, bindings))
 804          return PIPE_FORMAT_DXT1_RGB;
 805       else
 806          return default_rgb_format(screen, target, sample_count, bindings);
 807
 808    case GL_COMPRESSED_RGBA:
 809       /* can only sample from compressed formats */
 810       if (bindings & ~PIPE_BIND_SAMPLER_VIEW)
 811          return PIPE_FORMAT_NONE;
 812       else if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 813                                            target, sample_count, bindings))
 814          return PIPE_FORMAT_DXT3_RGBA;
 815       else
 816          return default_rgba_format(screen, target, sample_count, bindings);
 817
 818    case GL_RGB_S3TC:
 819    case GL_RGB4_S3TC:
 820    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 821       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGB,
 822                                       target, sample_count, bindings))
 823          return PIPE_FORMAT_DXT1_RGB;
 824       else
 825          return PIPE_FORMAT_NONE;
 826
 827    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 828       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_RGBA,
 829                                       target, sample_count, bindings))
 830          return PIPE_FORMAT_DXT1_RGBA;
 831       else
 832          return PIPE_FORMAT_NONE;
 833
 834    case GL_RGBA_S3TC:
 835    case GL_RGBA4_S3TC:
 836    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 837       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_RGBA,
 838                                       target, sample_count, bindings))
 839          return PIPE_FORMAT_DXT3_RGBA;
 840       else
 841          return PIPE_FORMAT_NONE;
 842
 843    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 844       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT5_RGBA,
 845                                       target, sample_count, bindings))
 846          return PIPE_FORMAT_DXT5_RGBA;
 847       else
 848          return PIPE_FORMAT_NONE;
 849
 850 #if 0
 851    case GL_COMPRESSED_RGB_FXT1_3DFX:
 852       return PIPE_FORMAT_RGB_FXT1;
 853    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 854       return PIPE_FORMAT_RGB_FXT1;
 855 #endif
 856
 857    case GL_DEPTH_COMPONENT16:
 858       if (screen->is_format_supported(screen, PIPE_FORMAT_Z16_UNORM, target,
 859                                       sample_count, bindings))
 860          return PIPE_FORMAT_Z16_UNORM;
 861       /* fall-through */
 862    case GL_DEPTH_COMPONENT24:
 863       if (screen->is_format_supported(screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 864                                       target, sample_count, bindings))
 865          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 866       if (screen->is_format_supported(screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 867                                       target, sample_count, bindings))
 868          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 869       /* fall-through */
 870    case GL_DEPTH_COMPONENT32:
 871       if (screen->is_format_supported(screen, PIPE_FORMAT_Z32_UNORM, target,
 872                                       sample_count, bindings))
 873          return PIPE_FORMAT_Z32_UNORM;
 874       /* fall-through */
 875    case GL_DEPTH_COMPONENT:
 876       {
 877          static const enum pipe_format formats[] = {
 878             PIPE_FORMAT_Z32_UNORM,
 879             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 880             PIPE_FORMAT_S8_USCALED_Z24_UNORM,
 881             PIPE_FORMAT_Z16_UNORM
 882          };
 883          return find_supported_format(screen, formats, Elements(formats),
 884                                       target, sample_count, bindings);
 885       }
 886
 887    case GL_STENCIL_INDEX:
 888    case GL_STENCIL_INDEX1_EXT:
 889    case GL_STENCIL_INDEX4_EXT:
 890    case GL_STENCIL_INDEX8_EXT:
 891    case GL_STENCIL_INDEX16_EXT:
 892       {
 893          static const enum pipe_format formats[] = {
 894             PIPE_FORMAT_S8_USCALED,
 895             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 896             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 897          };
 898          return find_supported_format(screen, formats, Elements(formats),
 899                                       target, sample_count, bindings);
 900       }
 901
 902    case GL_DEPTH_STENCIL_EXT:
 903    case GL_DEPTH24_STENCIL8_EXT:
 904       {
 905          static const enum pipe_format formats[] = {
 906             PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 907             PIPE_FORMAT_S8_USCALED_Z24_UNORM
 908          };
 909          return find_supported_format(screen, formats, Elements(formats),
 910                                       target, sample_count, bindings);
 911       }
 912
 913    case GL_SRGB_EXT:
 914    case GL_SRGB8_EXT:
 915    case GL_SRGB_ALPHA_EXT:
 916    case GL_SRGB8_ALPHA8_EXT:
 917       return default_srgba_format( screen, target, sample_count, bindings);
 918
 919    case GL_COMPRESSED_SRGB_EXT:
 920    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 921       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT1_SRGB, target,
 922                                       sample_count, bindings))
 923          return PIPE_FORMAT_DXT1_SRGB;
 924       return default_srgba_format( screen, target, sample_count, bindings);
 925
 926    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 927       return PIPE_FORMAT_DXT1_SRGBA;
 928
 929    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 930    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 931       if (screen->is_format_supported(screen, PIPE_FORMAT_DXT3_SRGBA, target,
 932                                       sample_count, bindings))
 933          return PIPE_FORMAT_DXT3_SRGBA;
 934       return default_srgba_format( screen, target, sample_count, bindings);
 935
 936    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 937       return PIPE_FORMAT_DXT5_SRGBA;
 938
 939    case GL_SLUMINANCE_ALPHA_EXT:
 940    case GL_SLUMINANCE8_ALPHA8_EXT:
 941    case GL_COMPRESSED_SLUMINANCE_EXT:
 942    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 943       if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_SRGB, target,
 944                                       sample_count, bindings))
 945          return PIPE_FORMAT_L8A8_SRGB;
 946       return default_srgba_format( screen, target, sample_count, bindings);
 947
 948    case GL_SLUMINANCE_EXT:
 949    case GL_SLUMINANCE8_EXT:
 950       if (screen->is_format_supported(screen, PIPE_FORMAT_L8_SRGB, target,
 951                                       sample_count, bindings))
 952          return PIPE_FORMAT_L8_SRGB;
 953       return default_srgba_format( screen, target, sample_count, bindings);
 954
 955    /* prefer formats in order of data size, choosing 16-bit ones if equal sized */
 956    case GL_RGBA16F_ARB:
 957       {
 958          static const enum pipe_format formats[] = {
 959                PIPE_FORMAT_R16G16B16A16_FLOAT,
 960                PIPE_FORMAT_R32G32B32A32_FLOAT
 961          };
 962          return find_supported_format(screen, formats, Elements(formats),
 963                                       target, sample_count, bindings);
 964       }
 965    case GL_RGB16F_ARB:
 966       {
 967          static const enum pipe_format formats[] = {
 968                PIPE_FORMAT_R16G16B16_FLOAT,
 969                PIPE_FORMAT_R16G16B16A16_FLOAT,
 970                PIPE_FORMAT_R32G32B32_FLOAT,
 971                PIPE_FORMAT_R32G32B32A32_FLOAT
 972          };
 973          return find_supported_format(screen, formats, Elements(formats),
 974                                       target, sample_count, bindings);
 975       }
 976    case GL_LUMINANCE_ALPHA16F_ARB:
 977       {
 978          static const enum pipe_format formats[] = {
 979                PIPE_FORMAT_L16A16_FLOAT,
 980                PIPE_FORMAT_R16G16B16A16_FLOAT,
 981                PIPE_FORMAT_L32A32_FLOAT,
 982                PIPE_FORMAT_R32G32B32A32_FLOAT
 983          };
 984          return find_supported_format(screen, formats, Elements(formats),
 985                target, sample_count, bindings);
 986       }
 987    case GL_ALPHA16F_ARB:
 988       {
 989          static const enum pipe_format formats[] = {
 990                PIPE_FORMAT_A16_FLOAT,
 991                PIPE_FORMAT_L16A16_FLOAT,
 992                PIPE_FORMAT_A32_FLOAT,
 993                PIPE_FORMAT_R16G16B16A16_FLOAT,
 994                PIPE_FORMAT_L32A32_FLOAT,
 995                PIPE_FORMAT_R32G32B32A32_FLOAT
 996          };
 997          return find_supported_format(screen, formats, Elements(formats),
 998                target, sample_count, bindings);
 999       }
1000    case GL_INTENSITY16F_ARB:
1001       {
1002          static const enum pipe_format formats[] = {
1003                PIPE_FORMAT_I16_FLOAT,
1004                PIPE_FORMAT_L16A16_FLOAT,
1005                PIPE_FORMAT_I32_FLOAT,
1006                PIPE_FORMAT_R16G16B16A16_FLOAT,
1007                PIPE_FORMAT_L32A32_FLOAT,
1008                PIPE_FORMAT_R32G32B32A32_FLOAT
1009          };
1010          return find_supported_format(screen, formats, Elements(formats),
1011                target, sample_count, bindings);
1012       }
1013    case GL_LUMINANCE16F_ARB:
1014       {
1015          static const enum pipe_format formats[] = {
1016                PIPE_FORMAT_L16_FLOAT,
1017                PIPE_FORMAT_L16A16_FLOAT,
1018                PIPE_FORMAT_L32_FLOAT,
1019                PIPE_FORMAT_R16G16B16A16_FLOAT,
1020                PIPE_FORMAT_L32A32_FLOAT,
1021                PIPE_FORMAT_R32G32B32A32_FLOAT
1022          };
1023          return find_supported_format(screen, formats, Elements(formats),
1024                target, sample_count, bindings);
1025       }
1026    case GL_R16F:
1027       {
1028          static const enum pipe_format formats[] = {
1029                PIPE_FORMAT_R16_FLOAT,
1030                PIPE_FORMAT_R16G16_FLOAT,
1031                PIPE_FORMAT_R32_FLOAT,
1032                PIPE_FORMAT_R16G16B16A16_FLOAT,
1033                PIPE_FORMAT_R32G32_FLOAT,
1034                PIPE_FORMAT_R32G32B32A32_FLOAT
1035          };
1036          return find_supported_format(screen, formats, Elements(formats),
1037                target, sample_count, bindings);
1038       }
1039    case GL_RG16F:
1040       {
1041          static const enum pipe_format formats[] = {
1042                PIPE_FORMAT_R16G16_FLOAT,
1043                PIPE_FORMAT_R16G16B16A16_FLOAT,
1044                PIPE_FORMAT_R32G32_FLOAT,
1045                PIPE_FORMAT_R32G32B32A32_FLOAT
1046          };
1047          return find_supported_format(screen, formats, Elements(formats),
1048                target, sample_count, bindings);
1049       }
1050
1051    /* try a 32-bit format if available, otherwise fallback to a 16-bit one */
1052    case GL_RGBA32F_ARB:
1053       {
1054          static const enum pipe_format formats[] = {
1055                PIPE_FORMAT_R32G32B32A32_FLOAT,
1056                PIPE_FORMAT_R16G16B16A16_FLOAT
1057          };
1058          return find_supported_format(screen, formats, Elements(formats),
1059                                       target, sample_count, bindings);
1060       }
1061    case GL_RGB32F_ARB:
1062       {
1063          static const enum pipe_format formats[] = {
1064                PIPE_FORMAT_R32G32B32_FLOAT,
1065                PIPE_FORMAT_R32G32B32A32_FLOAT,
1066                PIPE_FORMAT_R16G16B16A16_FLOAT
1067          };
1068          return find_supported_format(screen, formats, Elements(formats),
1069                                       target, sample_count, bindings);
1070       }
1071    case GL_LUMINANCE_ALPHA32F_ARB:
1072       {
1073          static const enum pipe_format formats[] = {
1074                PIPE_FORMAT_L32A32_FLOAT,
1075                PIPE_FORMAT_R32G32B32A32_FLOAT,
1076                PIPE_FORMAT_L16A16_FLOAT,
1077                PIPE_FORMAT_R16G16B16A16_FLOAT
1078          };
1079          return find_supported_format(screen, formats, Elements(formats),
1080                target, sample_count, bindings);
1081       }
1082    case GL_ALPHA32F_ARB:
1083       {
1084          static const enum pipe_format formats[] = {
1085                PIPE_FORMAT_A32_FLOAT,
1086                PIPE_FORMAT_L32A32_FLOAT,
1087                PIPE_FORMAT_R32G32B32A32_FLOAT,
1088                PIPE_FORMAT_A16_FLOAT,
1089                PIPE_FORMAT_L16A16_FLOAT,
1090                PIPE_FORMAT_R16G16B16A16_FLOAT
1091          };
1092          return find_supported_format(screen, formats, Elements(formats),
1093                target, sample_count, bindings);
1094       }
1095    case GL_INTENSITY32F_ARB:
1096       {
1097          static const enum pipe_format formats[] = {
1098                PIPE_FORMAT_I32_FLOAT,
1099                PIPE_FORMAT_L32A32_FLOAT,
1100                PIPE_FORMAT_R32G32B32A32_FLOAT,
1101                PIPE_FORMAT_I16_FLOAT,
1102                PIPE_FORMAT_L16A16_FLOAT,
1103                PIPE_FORMAT_R16G16B16A16_FLOAT
1104          };
1105          return find_supported_format(screen, formats, Elements(formats),
1106                target, sample_count, bindings);
1107       }
1108    case GL_LUMINANCE32F_ARB:
1109       {
1110          static const enum pipe_format formats[] = {
1111                PIPE_FORMAT_L32_FLOAT,
1112                PIPE_FORMAT_L32A32_FLOAT,
1113                PIPE_FORMAT_R32G32B32A32_FLOAT,
1114                PIPE_FORMAT_L16_FLOAT,
1115                PIPE_FORMAT_L16A16_FLOAT,
1116                PIPE_FORMAT_R16G16B16A16_FLOAT
1117          };
1118          return find_supported_format(screen, formats, Elements(formats),
1119                target, sample_count, bindings);
1120       }
1121    case GL_R32F:
1122       {
1123          static const enum pipe_format formats[] = {
1124                PIPE_FORMAT_R32_FLOAT,
1125                PIPE_FORMAT_R32G32_FLOAT,
1126                PIPE_FORMAT_R32G32B32A32_FLOAT,
1127                PIPE_FORMAT_R16_FLOAT,
1128                PIPE_FORMAT_R16G16_FLOAT,
1129                PIPE_FORMAT_R16G16B16A16_FLOAT
1130          };
1131          return find_supported_format(screen, formats, Elements(formats),
1132                target, sample_count, bindings);
1133       }
1134    case GL_RG32F:
1135       {
1136          static const enum pipe_format formats[] = {
1137                PIPE_FORMAT_R32G32_FLOAT,
1138                PIPE_FORMAT_R32G32B32A32_FLOAT,
1139                PIPE_FORMAT_R16G16_FLOAT,
1140                PIPE_FORMAT_R16G16B16A16_FLOAT
1141          };
1142          return find_supported_format(screen, formats, Elements(formats),
1143                target, sample_count, bindings);
1144       }
1145
1146    case GL_RED:
1147    case GL_R8:
1148       if (screen->is_format_supported(screen, PIPE_FORMAT_R8_UNORM, target,
1149                                       sample_count, bindings))
1150               return PIPE_FORMAT_R8_UNORM;
1151       return PIPE_FORMAT_NONE;
1152    case GL_RG:
1153    case GL_RG8:
1154       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM, target,
1155                                       sample_count, bindings))
1156               return PIPE_FORMAT_R8G8_UNORM;
1157       return PIPE_FORMAT_NONE;
1158
1159    case GL_R16:
1160       if (screen->is_format_supported(screen, PIPE_FORMAT_R16_UNORM, target,
1161                                       sample_count, bindings))
1162               return PIPE_FORMAT_R16_UNORM;
1163       return PIPE_FORMAT_NONE;
1164
1165    case GL_RG16:
1166       if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16_UNORM, target,
1167                                       sample_count, bindings))
1168               return PIPE_FORMAT_R16G16_UNORM;
1169       return PIPE_FORMAT_NONE;
1170
1171    case GL_COMPRESSED_RED:
1172    case GL_COMPRESSED_RED_RGTC1:
1173       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_UNORM, target,
1174                                       sample_count, bindings))
1175               return PIPE_FORMAT_RGTC1_UNORM;
1176       if (screen->is_format_supported(screen, PIPE_FORMAT_R8_UNORM, target,
1177                                       sample_count, bindings))
1178               return PIPE_FORMAT_R8_UNORM;
1179       return PIPE_FORMAT_NONE;
1180
1181    case GL_COMPRESSED_SIGNED_RED_RGTC1:
1182       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC1_SNORM, target,
1183                                       sample_count, bindings))
1184               return PIPE_FORMAT_RGTC1_SNORM;
1185       return PIPE_FORMAT_NONE;
1186
1187    case GL_COMPRESSED_RG:
1188    case GL_COMPRESSED_RG_RGTC2:
1189       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_UNORM, target,
1190                                       sample_count, bindings))
1191               return PIPE_FORMAT_RGTC2_UNORM;
1192       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8_UNORM, target,
1193                                       sample_count, bindings))
1194               return PIPE_FORMAT_R8G8_UNORM;
1195       return PIPE_FORMAT_NONE;
1196
1197    case GL_COMPRESSED_SIGNED_RG_RGTC2:
1198       if (screen->is_format_supported(screen, PIPE_FORMAT_RGTC2_SNORM, target,
1199                                       sample_count, bindings))
1200               return PIPE_FORMAT_RGTC2_SNORM;
1201       return PIPE_FORMAT_NONE;
1202
1203    case GL_COMPRESSED_LUMINANCE:
1204    case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
1205       if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_UNORM, target,
1206                                       sample_count, bindings))
1207               return PIPE_FORMAT_LATC1_UNORM;
1208       if (screen->is_format_supported(screen, PIPE_FORMAT_L8_UNORM, target,
1209                                       sample_count, bindings))
1210               return PIPE_FORMAT_L8_UNORM;
1211       return PIPE_FORMAT_NONE;
1212
1213    case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
1214       if (screen->is_format_supported(screen, PIPE_FORMAT_LATC1_SNORM, target,
1215                                       sample_count, bindings))
1216               return PIPE_FORMAT_LATC1_SNORM;
1217       return PIPE_FORMAT_NONE;
1218
1219    case GL_COMPRESSED_LUMINANCE_ALPHA:
1220    case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
1221    case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
1222       if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_UNORM, target,
1223                                       sample_count, bindings))
1224               return PIPE_FORMAT_LATC2_UNORM;
1225       if (screen->is_format_supported(screen, PIPE_FORMAT_L8A8_UNORM, target,
1226                                       sample_count, bindings))
1227               return PIPE_FORMAT_L8A8_UNORM;
1228       return PIPE_FORMAT_NONE;
1229
1230    case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
1231       if (screen->is_format_supported(screen, PIPE_FORMAT_LATC2_SNORM, target,
1232                                       sample_count, bindings))
1233               return PIPE_FORMAT_LATC2_SNORM;
1234       return PIPE_FORMAT_NONE;
1235
1236    /* signed/unsigned integer formats.
1237     * XXX Mesa only has formats for RGBA signed/unsigned integer formats.
1238     * If/when new formats are added this code should be updated.
1239     */
1240    case GL_RED_INTEGER_EXT:
1241    case GL_GREEN_INTEGER_EXT:
1242    case GL_BLUE_INTEGER_EXT:
1243    case GL_ALPHA_INTEGER_EXT:
1244    case GL_RGB_INTEGER_EXT:
1245    case GL_RGBA_INTEGER_EXT:
1246    case GL_BGR_INTEGER_EXT:
1247    case GL_BGRA_INTEGER_EXT:
1248    case GL_LUMINANCE_INTEGER_EXT:
1249    case GL_LUMINANCE_ALPHA_INTEGER_EXT:
1250       /* fall-through */
1251    case GL_RGBA8I_EXT:
1252    case GL_RGB8I_EXT:
1253    case GL_ALPHA8I_EXT:
1254    case GL_INTENSITY8I_EXT:
1255    case GL_LUMINANCE8I_EXT:
1256    case GL_LUMINANCE_ALPHA8I_EXT:
1257       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SSCALED,
1258                                       target,
1259                                       sample_count, bindings))
1260          return PIPE_FORMAT_R8G8B8A8_SSCALED;
1261       return PIPE_FORMAT_NONE;
1262    case GL_RGBA16I_EXT:
1263    case GL_RGB16I_EXT:
1264    case GL_ALPHA16I_EXT:
1265    case GL_INTENSITY16I_EXT:
1266    case GL_LUMINANCE16I_EXT:
1267    case GL_LUMINANCE_ALPHA16I_EXT:
1268       if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SSCALED,
1269                                       target,
1270                                       sample_count, bindings))
1271          return PIPE_FORMAT_R16G16B16A16_SSCALED;
1272       return PIPE_FORMAT_NONE;
1273    case GL_RGBA32I_EXT:
1274    case GL_RGB32I_EXT:
1275    case GL_ALPHA32I_EXT:
1276    case GL_INTENSITY32I_EXT:
1277    case GL_LUMINANCE32I_EXT:
1278    case GL_LUMINANCE_ALPHA32I_EXT:
1279       /* xxx */
1280       if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_SSCALED,
1281                                       target,
1282                                       sample_count, bindings))
1283          return PIPE_FORMAT_R32G32B32A32_SSCALED;
1284       return PIPE_FORMAT_NONE;
1285
1286    case GL_RGBA8UI_EXT:
1287    case GL_RGB8UI_EXT:
1288    case GL_ALPHA8UI_EXT:
1289    case GL_INTENSITY8UI_EXT:
1290    case GL_LUMINANCE8UI_EXT:
1291    case GL_LUMINANCE_ALPHA8UI_EXT:
1292       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_USCALED,
1293                                       target,
1294                                       sample_count, bindings))
1295          return PIPE_FORMAT_R8G8B8A8_USCALED;
1296       return PIPE_FORMAT_NONE;
1297
1298    case GL_RGBA16UI_EXT:
1299    case GL_RGB16UI_EXT:
1300    case GL_ALPHA16UI_EXT:
1301    case GL_INTENSITY16UI_EXT:
1302    case GL_LUMINANCE16UI_EXT:
1303    case GL_LUMINANCE_ALPHA16UI_EXT:
1304       if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_USCALED,
1305                                       target,
1306                                       sample_count, bindings))
1307          return PIPE_FORMAT_R16G16B16A16_USCALED;
1308       return PIPE_FORMAT_NONE;
1309
1310    case GL_RGBA32UI_EXT:
1311    case GL_RGB32UI_EXT:
1312    case GL_ALPHA32UI_EXT:
1313    case GL_INTENSITY32UI_EXT:
1314    case GL_LUMINANCE32UI_EXT:
1315    case GL_LUMINANCE_ALPHA32UI_EXT:
1316       if (screen->is_format_supported(screen, PIPE_FORMAT_R32G32B32A32_USCALED,
1317                                       target,
1318                                       sample_count, bindings))
1319          return PIPE_FORMAT_R32G32B32A32_USCALED;
1320       return PIPE_FORMAT_NONE;
1321
1322    /* signed normalized formats */
1323    case GL_RED_SNORM:
1324    case GL_R8_SNORM:
1325       {
1326          static const enum pipe_format formats[] = {
1327             PIPE_FORMAT_R8_SNORM,
1328             PIPE_FORMAT_R8G8_SNORM,
1329             PIPE_FORMAT_R8G8B8A8_SNORM,
1330          };
1331          return find_supported_format(screen, formats, Elements(formats),
1332                target, sample_count, bindings);
1333       }
1334
1335    case GL_R16_SNORM:
1336       {
1337          static const enum pipe_format formats[] = {
1338             PIPE_FORMAT_R16_SNORM,
1339             PIPE_FORMAT_R16G16_SNORM,
1340             PIPE_FORMAT_R16G16B16A16_SNORM,
1341             PIPE_FORMAT_R8_SNORM,
1342             PIPE_FORMAT_R8G8_SNORM,
1343             PIPE_FORMAT_R8G8B8A8_SNORM,
1344          };
1345          return find_supported_format(screen, formats, Elements(formats),
1346                target, sample_count, bindings);
1347       }
1348
1349    case GL_RG_SNORM:
1350    case GL_RG8_SNORM:
1351       {
1352          static const enum pipe_format formats[] = {
1353             PIPE_FORMAT_R8G8_SNORM,
1354             PIPE_FORMAT_R8G8B8A8_SNORM,
1355          };
1356          return find_supported_format(screen, formats, Elements(formats),
1357                target, sample_count, bindings);
1358       }
1359
1360    case GL_RG16_SNORM:
1361       {
1362          static const enum pipe_format formats[] = {
1363             PIPE_FORMAT_R16G16_SNORM,
1364             PIPE_FORMAT_R16G16B16A16_SNORM,
1365             PIPE_FORMAT_R8G8_SNORM,
1366             PIPE_FORMAT_R8G8B8A8_SNORM,
1367          };
1368          return find_supported_format(screen, formats, Elements(formats),
1369                target, sample_count, bindings);
1370       }
1371
1372    case GL_RGB_SNORM:
1373    case GL_RGB8_SNORM:
1374    case GL_RGBA_SNORM:
1375    case GL_RGBA8_SNORM:
1376       if (screen->is_format_supported(screen, PIPE_FORMAT_R8G8B8A8_SNORM,
1377                                       target,
1378                                       sample_count, bindings))
1379          return PIPE_FORMAT_R8G8B8A8_SNORM;
1380       return PIPE_FORMAT_NONE;
1381
1382    case GL_RGB16_SNORM:
1383    case GL_RGBA16_SNORM:
1384       {
1385          static const enum pipe_format formats[] = {
1386             PIPE_FORMAT_R16G16B16A16_SNORM,
1387             PIPE_FORMAT_R8G8B8A8_SNORM,
1388          };
1389          return find_supported_format(screen, formats, Elements(formats),
1390                target, sample_count, bindings);
1391       }
1392
1393
1394    case GL_ALPHA_SNORM:
1395    case GL_ALPHA8_SNORM:
1396       {
1397          static const enum pipe_format formats[] = {
1398             PIPE_FORMAT_A8_SNORM,
1399             PIPE_FORMAT_R8G8B8A8_SNORM,
1400          };
1401          return find_supported_format(screen, formats, Elements(formats),
1402                target, sample_count, bindings);
1403       }
1404
1405    case GL_ALPHA16_SNORM:
1406       {
1407          static const enum pipe_format formats[] = {
1408             PIPE_FORMAT_A16_SNORM,
1409             PIPE_FORMAT_R16G16B16A16_SNORM,
1410             PIPE_FORMAT_A8_SNORM,
1411             PIPE_FORMAT_R8G8B8A8_SNORM,
1412          };
1413          return find_supported_format(screen, formats, Elements(formats),
1414                target, sample_count, bindings);
1415       }
1416
1417    case GL_LUMINANCE_SNORM:
1418    case GL_LUMINANCE8_SNORM:
1419       {
1420          static const enum pipe_format formats[] = {
1421             PIPE_FORMAT_L8_SNORM,
1422             PIPE_FORMAT_R8G8B8A8_SNORM,
1423          };
1424          return find_supported_format(screen, formats, Elements(formats),
1425                target, sample_count, bindings);
1426       }
1427
1428    case GL_LUMINANCE16_SNORM:
1429       {
1430          static const enum pipe_format formats[] = {
1431             PIPE_FORMAT_L16_SNORM,
1432             PIPE_FORMAT_R16G16B16A16_SNORM,
1433             PIPE_FORMAT_L8_SNORM,
1434             PIPE_FORMAT_R8G8B8A8_SNORM,
1435          };
1436          return find_supported_format(screen, formats, Elements(formats),
1437                target, sample_count, bindings);
1438       }
1439
1440    case GL_LUMINANCE_ALPHA_SNORM:
1441    case GL_LUMINANCE8_ALPHA8_SNORM:
1442       {
1443          static const enum pipe_format formats[] = {
1444             PIPE_FORMAT_L8A8_SNORM,
1445             PIPE_FORMAT_R8G8B8A8_SNORM,
1446          };
1447          return find_supported_format(screen, formats, Elements(formats),
1448                target, sample_count, bindings);
1449       }
1450
1451    case GL_LUMINANCE16_ALPHA16_SNORM:
1452       {
1453          static const enum pipe_format formats[] = {
1454             PIPE_FORMAT_L16A16_SNORM,
1455             PIPE_FORMAT_R16G16B16A16_SNORM,
1456             PIPE_FORMAT_L8A8_SNORM,
1457             PIPE_FORMAT_R8G8B8A8_SNORM,
1458          };
1459          return find_supported_format(screen, formats, Elements(formats),
1460                target, sample_count, bindings);
1461       }
1462
1463    case GL_INTENSITY_SNORM:
1464    case GL_INTENSITY8_SNORM:
1465       {
1466          static const enum pipe_format formats[] = {
1467             PIPE_FORMAT_I8_SNORM,
1468             PIPE_FORMAT_R8G8B8A8_SNORM,
1469          };
1470          return find_supported_format(screen, formats, Elements(formats),
1471                target, sample_count, bindings);
1472       }
1473
1474    case GL_INTENSITY16_SNORM:
1475       {
1476          static const enum pipe_format formats[] = {
1477             PIPE_FORMAT_I16_SNORM,
1478             PIPE_FORMAT_R16G16B16A16_SNORM,
1479             PIPE_FORMAT_I8_SNORM,
1480             PIPE_FORMAT_R8G8B8A8_SNORM,
1481          };
1482          return find_supported_format(screen, formats, Elements(formats),
1483                target, sample_count, bindings);
1484       }
1485
1486    default:
1487       return PIPE_FORMAT_NONE;
1488    }
1489 }
1490
1491
1492 /**
1493  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
1494  */
1495 enum pipe_format
1496 st_choose_renderbuffer_format(struct pipe_screen *screen,
1497                               GLenum internalFormat, unsigned sample_count)
1498 {
1499    uint usage;
1500    if (_mesa_is_depth_or_stencil_format(internalFormat))
1501       usage = PIPE_BIND_DEPTH_STENCIL;
1502    else
1503       usage = PIPE_BIND_RENDER_TARGET;
1504    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D,
1505                            sample_count, usage);
1506 }
1507
1508
1509 /**
1510  * Called via ctx->Driver.chooseTextureFormat().
1511  */
1512 gl_format
1513 st_ChooseTextureFormat_renderable(struct gl_context *ctx, GLint internalFormat,
1514                                   GLenum format, GLenum type, GLboolean renderable)
1515 {
1516    struct pipe_screen *screen = st_context(ctx)->pipe->screen;
1517    enum pipe_format pFormat;
1518    uint bindings;
1519
1520    (void) format;
1521    (void) type;
1522
1523    /* GL textures may wind up being render targets, but we don't know
1524     * that in advance.  Specify potential render target flags now.
1525     */
1526    bindings = PIPE_BIND_SAMPLER_VIEW;
1527    if (renderable == GL_TRUE) {
1528       if (_mesa_is_depth_format(internalFormat) ||
1529           _mesa_is_depth_or_stencil_format(internalFormat))
1530          bindings |= PIPE_BIND_DEPTH_STENCIL;
1531       else
1532          bindings |= PIPE_BIND_RENDER_TARGET;
1533    }
1534
1535    pFormat = st_choose_format(screen, internalFormat,
1536                               PIPE_TEXTURE_2D, 0, bindings);
1537
1538    if (pFormat == PIPE_FORMAT_NONE) {
1539       /* try choosing format again, this time without render target bindings */
1540       pFormat = st_choose_format(screen, internalFormat,
1541                                  PIPE_TEXTURE_2D, 0, PIPE_BIND_SAMPLER_VIEW);
1542    }
1543
1544    if (pFormat == PIPE_FORMAT_NONE) {
1545       /* no luck at all */
1546       return MESA_FORMAT_NONE;
1547    }
1548
1549    return st_pipe_format_to_mesa_format(pFormat);
1550 }
1551
1552 gl_format
1553 st_ChooseTextureFormat(struct gl_context *ctx, GLint internalFormat,
1554                        GLenum format, GLenum type)
1555 {
1556    boolean want_renderable =
1557       internalFormat == 3 || internalFormat == 4 ||
1558       internalFormat == GL_RGB || internalFormat == GL_RGBA ||
1559       internalFormat == GL_RGB8 || internalFormat == GL_RGBA8 ||
1560       internalFormat == GL_BGRA;
1561
1562    return st_ChooseTextureFormat_renderable(ctx, internalFormat,
1563                                             format, type, want_renderable);
1564 }
1565
1566 /**
1567  * Test if a gallium format is equivalent to a GL format/type.
1568  */
1569 GLboolean
1570 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
1571 {
1572    switch (pFormat) {
1573    case PIPE_FORMAT_A8B8G8R8_UNORM:
1574       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
1575    case PIPE_FORMAT_A8R8G8B8_UNORM:
1576       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
1577    case PIPE_FORMAT_B5G6R5_UNORM:
1578       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
1579    /* XXX more combos... */
1580    default:
1581       return GL_FALSE;
1582    }
1583 }
1584
1585 GLboolean
1586 st_sampler_compat_formats(enum pipe_format format1, enum pipe_format format2)
1587 {
1588    if (format1 == format2)
1589       return GL_TRUE;
1590
1591    if (format1 == PIPE_FORMAT_B8G8R8A8_UNORM &&
1592        format2 == PIPE_FORMAT_B8G8R8X8_UNORM)
1593       return GL_TRUE;
1594
1595    if (format1 == PIPE_FORMAT_B8G8R8X8_UNORM &&
1596        format2 == PIPE_FORMAT_B8G8R8A8_UNORM)
1597       return GL_TRUE;
1598
1599    if (format1 == PIPE_FORMAT_A8B8G8R8_UNORM &&
1600        format2 == PIPE_FORMAT_X8B8G8R8_UNORM)
1601       return GL_TRUE;
1602
1603    if (format1 == PIPE_FORMAT_X8B8G8R8_UNORM &&
1604        format2 == PIPE_FORMAT_A8B8G8R8_UNORM)
1605       return GL_TRUE;
1606
1607    if (format1 == PIPE_FORMAT_A8R8G8B8_UNORM &&
1608        format2 == PIPE_FORMAT_X8R8G8B8_UNORM)
1609       return GL_TRUE;
1610
1611    if (format1 == PIPE_FORMAT_X8R8G8B8_UNORM &&
1612        format2 == PIPE_FORMAT_A8R8G8B8_UNORM)
1613       return GL_TRUE;
1614
1615    return GL_FALSE;
1616 }
1617
1618
1619
1620 /**
1621  * This is used for translating texture border color and the clear
1622  * color.  For example, the clear color is interpreted according to
1623  * the renderbuffer's base format.  For example, if clearing a
1624  * GL_LUMINANCE buffer, ClearColor[0] = luminance and ClearColor[1] =
1625  * alpha.  Similarly for texture border colors.
1626  */
1627 void
1628 st_translate_color(const GLfloat colorIn[4], GLenum baseFormat,
1629                    GLfloat colorOut[4])
1630 {
1631    switch (baseFormat) {
1632    case GL_RED:
1633       colorOut[0] = colorIn[0];
1634       colorOut[1] = 0.0F;
1635       colorOut[2] = 0.0F;
1636       colorOut[3] = 1.0F;
1637       break;
1638    case GL_RG:
1639       colorOut[0] = colorIn[0];
1640       colorOut[1] = colorIn[1];
1641       colorOut[2] = 0.0F;
1642       colorOut[3] = 1.0F;
1643       break;
1644    case GL_RGB:
1645       colorOut[0] = colorIn[0];
1646       colorOut[1] = colorIn[1];
1647       colorOut[2] = colorIn[2];
1648       colorOut[3] = 1.0F;
1649       break;
1650    case GL_ALPHA:
1651       colorOut[0] = colorOut[1] = colorOut[2] = 0.0;
1652       colorOut[3] = colorIn[3];
1653       break;
1654    case GL_LUMINANCE:
1655       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1656       colorOut[3] = 1.0;
1657       break;
1658    case GL_LUMINANCE_ALPHA:
1659       colorOut[0] = colorOut[1] = colorOut[2] = colorIn[0];
1660       colorOut[3] = colorIn[3];
1661       break;
1662    case GL_INTENSITY:
1663       colorOut[0] = colorOut[1] = colorOut[2] = colorOut[3] = colorIn[0];
1664       break;
1665    default:
1666       COPY_4V(colorOut, colorIn);
1667    }
1668 }