src/mesa/state_tracker/st_format.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * Copyright (c) 2008 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  * Texture Image-related functions.
  32  * \author Brian Paul
  33  */
  34
  35 #include "main/imports.h"
  36 #include "main/context.h"
  37 #include "main/texstore.h"
  38 #include "main/enums.h"
  39 #include "main/macros.h"
  40
  41 #include "pipe/p_context.h"
  42 #include "pipe/p_defines.h"
  43 #include "pipe/p_screen.h"
  44 #include "util/u_format.h"
  45 #include "st_context.h"
  46 #include "st_format.h"
  47
  48
  49 static GLuint
  50 format_max_bits(enum pipe_format format)
  51 {
  52    GLuint size = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
  53
  54    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1));
  55    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2));
  56    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3));
  57    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0));
  58    size = MAX2(size, util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1));
  59    return size;
  60 }
  61
  62 static GLuint
  63 format_size(enum pipe_format format)
  64 {
  65    return
  66       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0) +
  67       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1) +
  68       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2) +
  69       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3) +
  70       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0) +
  71       util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1);
  72 }
  73
  74 /*
  75  * XXX temporary here
  76  */
  77 GLboolean
  78 st_get_format_info(enum pipe_format format, struct pipe_format_info *pinfo)
  79 {
  80    const struct util_format_description *desc;
  81
  82    desc = util_format_description(format);
  83    assert(desc);
  84
  85    if (desc->layout == UTIL_FORMAT_LAYOUT_ARITH ||
  86        desc->layout == UTIL_FORMAT_LAYOUT_ARRAY) {
  87 #if 0
  88       printf("%s\n", util_format_name( format ) );
  89 #endif
  90
  91       /* Data type */
  92       if (format == PIPE_FORMAT_A1R5G5B5_UNORM || format == PIPE_FORMAT_R5G6B5_UNORM) {
  93          pinfo->datatype = GL_UNSIGNED_SHORT;
  94       }
  95       else if (format == PIPE_FORMAT_S8Z24_UNORM ||
  96                format == PIPE_FORMAT_Z24S8_UNORM) {
  97          pinfo->datatype = GL_UNSIGNED_INT_24_8;
  98       }
  99       else {
 100          const GLuint size = format_max_bits(format);
 101          if (size == 8) {
 102             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 103                pinfo->datatype = GL_UNSIGNED_BYTE;
 104             else
 105                pinfo->datatype = GL_BYTE;
 106          }
 107          else if (size == 16) {
 108             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 109                pinfo->datatype = GL_UNSIGNED_SHORT;
 110             else
 111                pinfo->datatype = GL_SHORT;
 112          }
 113          else {
 114             assert( size <= 32 );
 115             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 116                pinfo->datatype = GL_UNSIGNED_INT;
 117             else
 118                pinfo->datatype = GL_INT;
 119          }
 120       }
 121
 122       /* Component bits */
 123       pinfo->red_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 0);
 124       pinfo->green_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 1);
 125       pinfo->blue_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 2);
 126       pinfo->alpha_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_RGB, 3);
 127       pinfo->depth_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 0);
 128       pinfo->stencil_bits = util_format_get_component_bits(format, UTIL_FORMAT_COLORSPACE_ZS, 1);
 129       pinfo->luminance_bits = 0;
 130       pinfo->intensity_bits = 0;
 131
 132       /* Format size */
 133       pinfo->size = format_size(format) / 8;
 134
 135       /* Luminance & Intensity bits */
 136       if (desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
 137           desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
 138           desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X) {
 139          if (desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
 140             pinfo->intensity_bits = pinfo->red_bits;
 141          }
 142          else {
 143             pinfo->luminance_bits = pinfo->red_bits;
 144          }
 145          pinfo->red_bits = 0;
 146       }
 147
 148       pinfo->mesa_format = st_pipe_format_to_mesa_format(format);
 149    }
 150    else if (desc->layout == UTIL_FORMAT_LAYOUT_YUV) {
 151       pinfo->mesa_format = MESA_FORMAT_YCBCR;
 152       pinfo->datatype = GL_UNSIGNED_SHORT;
 153       pinfo->size = 2; /* two bytes per "texel" */
 154    }
 155    else {
 156       /* compressed format? */
 157       assert(0);
 158    }
 159
 160 #if 0
 161    printf(
 162       "ST_FORMAT: R(%u), G(%u), B(%u), A(%u), Z(%u), S(%u)\n",
 163       pinfo->red_bits,
 164       pinfo->green_bits,
 165       pinfo->blue_bits,
 166       pinfo->alpha_bits,
 167       pinfo->depth_bits,
 168       pinfo->stencil_bits );
 169 #endif
 170
 171    pinfo->format = format;
 172
 173    return GL_TRUE;
 174 }
 175
 176
 177 /**
 178  * Return bytes per pixel for the given format.
 179  */
 180 GLuint
 181 st_sizeof_format(enum pipe_format format)
 182 {
 183    struct pipe_format_info info;
 184    if (!st_get_format_info( format, &info )) {
 185       assert( 0 );
 186       return 0;
 187    }
 188    return info.size;
 189 }
 190
 191
 192 /**
 193  * Return bytes per pixel for the given format.
 194  */
 195 GLenum
 196 st_format_datatype(enum pipe_format format)
 197 {
 198    struct pipe_format_info info;
 199    if (!st_get_format_info( format, &info )) {
 200       assert( 0 );
 201       return 0;
 202    }
 203    return info.datatype;
 204 }
 205
 206
 207 enum pipe_format
 208 st_mesa_format_to_pipe_format(gl_format mesaFormat)
 209 {
 210    switch (mesaFormat) {
 211       /* fix this */
 212    case MESA_FORMAT_ARGB8888_REV:
 213    case MESA_FORMAT_ARGB8888:
 214       return PIPE_FORMAT_A8R8G8B8_UNORM;
 215    case MESA_FORMAT_XRGB8888:
 216       return PIPE_FORMAT_X8R8G8B8_UNORM;
 217    case MESA_FORMAT_ARGB1555:
 218       return PIPE_FORMAT_A1R5G5B5_UNORM;
 219    case MESA_FORMAT_ARGB4444:
 220       return PIPE_FORMAT_A4R4G4B4_UNORM;
 221    case MESA_FORMAT_RGB565:
 222       return PIPE_FORMAT_R5G6B5_UNORM;
 223    case MESA_FORMAT_AL88:
 224       return PIPE_FORMAT_A8L8_UNORM;
 225    case MESA_FORMAT_A8:
 226       return PIPE_FORMAT_A8_UNORM;
 227    case MESA_FORMAT_L8:
 228       return PIPE_FORMAT_L8_UNORM;
 229    case MESA_FORMAT_I8:
 230       return PIPE_FORMAT_I8_UNORM;
 231    case MESA_FORMAT_Z16:
 232       return PIPE_FORMAT_Z16_UNORM;
 233    case MESA_FORMAT_Z32:
 234       return PIPE_FORMAT_Z32_UNORM;
 235    case MESA_FORMAT_Z24_S8:
 236       return PIPE_FORMAT_Z24S8_UNORM;
 237    case MESA_FORMAT_S8_Z24:
 238       return PIPE_FORMAT_S8Z24_UNORM;
 239    case MESA_FORMAT_YCBCR:
 240       return PIPE_FORMAT_YCBCR;
 241 #if FEATURE_texture_s3tc
 242    case MESA_FORMAT_RGB_DXT1:
 243       return PIPE_FORMAT_DXT1_RGB;
 244    case MESA_FORMAT_RGBA_DXT1:
 245       return PIPE_FORMAT_DXT1_RGBA;
 246    case MESA_FORMAT_RGBA_DXT3:
 247       return PIPE_FORMAT_DXT3_RGBA;
 248    case MESA_FORMAT_RGBA_DXT5:
 249       return PIPE_FORMAT_DXT5_RGBA;
 250 #if FEATURE_EXT_texture_sRGB
 251    case MESA_FORMAT_SRGB_DXT1:
 252       return PIPE_FORMAT_DXT1_SRGB;
 253    case MESA_FORMAT_SRGBA_DXT1:
 254       return PIPE_FORMAT_DXT1_SRGBA;
 255    case MESA_FORMAT_SRGBA_DXT3:
 256       return PIPE_FORMAT_DXT3_SRGBA;
 257    case MESA_FORMAT_SRGBA_DXT5:
 258       return PIPE_FORMAT_DXT5_SRGBA;
 259 #endif
 260 #endif
 261 #if FEATURE_EXT_texture_sRGB
 262    case MESA_FORMAT_SLA8:
 263       return PIPE_FORMAT_A8L8_SRGB;
 264    case MESA_FORMAT_SL8:
 265       return PIPE_FORMAT_L8_SRGB;
 266    case MESA_FORMAT_SRGB8:
 267       return PIPE_FORMAT_R8G8B8_SRGB;
 268    case MESA_FORMAT_SRGBA8:
 269       return PIPE_FORMAT_R8G8B8A8_SRGB;
 270    case MESA_FORMAT_SARGB8:
 271       return PIPE_FORMAT_A8R8G8B8_SRGB;
 272 #endif
 273    default:
 274       assert(0);
 275       return 0;
 276    }
 277 }
 278
 279
 280 gl_format
 281 st_pipe_format_to_mesa_format(enum pipe_format pipeFormat)
 282 {
 283    switch (pipeFormat) {
 284    case PIPE_FORMAT_A8R8G8B8_UNORM:
 285       return MESA_FORMAT_ARGB8888;
 286    case PIPE_FORMAT_X8R8G8B8_UNORM:
 287       return MESA_FORMAT_XRGB8888;
 288    case PIPE_FORMAT_B8G8R8A8_UNORM:
 289       return MESA_FORMAT_ARGB8888_REV;
 290    case PIPE_FORMAT_B8G8R8X8_UNORM:
 291       return MESA_FORMAT_XRGB8888_REV;
 292    case PIPE_FORMAT_A1R5G5B5_UNORM:
 293       return MESA_FORMAT_ARGB1555;
 294    case PIPE_FORMAT_A4R4G4B4_UNORM:
 295       return MESA_FORMAT_ARGB4444;
 296    case PIPE_FORMAT_R5G6B5_UNORM:
 297       return MESA_FORMAT_RGB565;
 298    case PIPE_FORMAT_A8L8_UNORM:
 299       return MESA_FORMAT_AL88;
 300    case PIPE_FORMAT_A8_UNORM:
 301       return MESA_FORMAT_A8;
 302    case PIPE_FORMAT_L8_UNORM:
 303       return MESA_FORMAT_L8;
 304    case PIPE_FORMAT_I8_UNORM:
 305       return MESA_FORMAT_I8;
 306    case PIPE_FORMAT_Z16_UNORM:
 307       return MESA_FORMAT_Z16;
 308    case PIPE_FORMAT_Z32_UNORM:
 309       return MESA_FORMAT_Z32;
 310    case PIPE_FORMAT_Z24X8_UNORM:
 311       return MESA_FORMAT_Z24_X8;
 312    case PIPE_FORMAT_Z24S8_UNORM:
 313       return MESA_FORMAT_Z24_S8;
 314    case PIPE_FORMAT_X8Z24_UNORM:
 315       return MESA_FORMAT_X8_Z24;
 316    case PIPE_FORMAT_S8Z24_UNORM:
 317       return MESA_FORMAT_S8_Z24;
 318    case PIPE_FORMAT_S8_UNORM:
 319       return MESA_FORMAT_S8;
 320
 321    case PIPE_FORMAT_YCBCR:
 322       return MESA_FORMAT_YCBCR;
 323    case PIPE_FORMAT_R16G16B16A16_SNORM:
 324       return MESA_FORMAT_SIGNED_RGBA_16;
 325
 326 #if FEATURE_texture_s3tc
 327    case PIPE_FORMAT_DXT1_RGB:
 328       return MESA_FORMAT_RGB_DXT1;
 329    case PIPE_FORMAT_DXT1_RGBA:
 330       return MESA_FORMAT_RGBA_DXT1;
 331    case PIPE_FORMAT_DXT3_RGBA:
 332       return MESA_FORMAT_RGBA_DXT3;
 333    case PIPE_FORMAT_DXT5_RGBA:
 334       return MESA_FORMAT_RGBA_DXT5;
 335 #if FEATURE_EXT_texture_sRGB
 336    case PIPE_FORMAT_DXT1_SRGB:
 337       return MESA_FORMAT_SRGB_DXT1;
 338    case PIPE_FORMAT_DXT1_SRGBA:
 339       return MESA_FORMAT_SRGBA_DXT1;
 340    case PIPE_FORMAT_DXT3_SRGBA:
 341       return MESA_FORMAT_SRGBA_DXT3;
 342    case PIPE_FORMAT_DXT5_SRGBA:
 343       return MESA_FORMAT_SRGBA_DXT5;
 344 #endif
 345 #endif
 346 #if FEATURE_EXT_texture_sRGB
 347    case PIPE_FORMAT_A8L8_SRGB:
 348       return MESA_FORMAT_SLA8;
 349    case PIPE_FORMAT_L8_SRGB:
 350       return MESA_FORMAT_SL8;
 351    case PIPE_FORMAT_R8G8B8_SRGB:
 352       return MESA_FORMAT_SRGB8;
 353    case PIPE_FORMAT_R8G8B8A8_SRGB:
 354       return MESA_FORMAT_SRGBA8;
 355    case PIPE_FORMAT_A8R8G8B8_SRGB:
 356       return MESA_FORMAT_SARGB8;
 357 #endif
 358    default:
 359       assert(0);
 360       return 0;
 361    }
 362 }
 363
 364
 365 /**
 366  * Find an RGBA format supported by the context/winsys.
 367  */
 368 static enum pipe_format
 369 default_rgba_format(struct pipe_screen *screen,
 370                     enum pipe_texture_target target,
 371                     unsigned tex_usage,
 372                     unsigned geom_flags)
 373 {
 374    static const enum pipe_format colorFormats[] = {
 375       PIPE_FORMAT_A8R8G8B8_UNORM,
 376       PIPE_FORMAT_B8G8R8A8_UNORM,
 377       PIPE_FORMAT_R8G8B8A8_UNORM,
 378       PIPE_FORMAT_R5G6B5_UNORM
 379    };
 380    uint i;
 381    for (i = 0; i < Elements(colorFormats); i++) {
 382       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 383          return colorFormats[i];
 384       }
 385    }
 386    return PIPE_FORMAT_NONE;
 387 }
 388
 389 /**
 390  * Find an RGB format supported by the context/winsys.
 391  */
 392 static enum pipe_format
 393 default_rgb_format(struct pipe_screen *screen,
 394                    enum pipe_texture_target target,
 395                    unsigned tex_usage,
 396                    unsigned geom_flags)
 397 {
 398    static const enum pipe_format colorFormats[] = {
 399       PIPE_FORMAT_X8R8G8B8_UNORM,
 400       PIPE_FORMAT_B8G8R8X8_UNORM,
 401       PIPE_FORMAT_R8G8B8X8_UNORM,
 402       PIPE_FORMAT_A8R8G8B8_UNORM,
 403       PIPE_FORMAT_B8G8R8A8_UNORM,
 404       PIPE_FORMAT_R8G8B8A8_UNORM,
 405       PIPE_FORMAT_R5G6B5_UNORM
 406    };
 407    uint i;
 408    for (i = 0; i < Elements(colorFormats); i++) {
 409       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 410          return colorFormats[i];
 411       }
 412    }
 413    return PIPE_FORMAT_NONE;
 414 }
 415
 416 /**
 417  * Find an sRGBA format supported by the context/winsys.
 418  */
 419 static enum pipe_format
 420 default_srgba_format(struct pipe_screen *screen,
 421                     enum pipe_texture_target target,
 422                     unsigned tex_usage,
 423                     unsigned geom_flags)
 424 {
 425    static const enum pipe_format colorFormats[] = {
 426       PIPE_FORMAT_A8R8G8B8_SRGB,
 427       PIPE_FORMAT_B8G8R8A8_SRGB,
 428       PIPE_FORMAT_R8G8B8A8_SRGB,
 429    };
 430    uint i;
 431    for (i = 0; i < Elements(colorFormats); i++) {
 432       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 433          return colorFormats[i];
 434       }
 435    }
 436    return PIPE_FORMAT_NONE;
 437 }
 438
 439 /**
 440  * Search list of formats for first RGBA format with >8 bits/channel.
 441  */
 442 static enum pipe_format
 443 default_deep_rgba_format(struct pipe_screen *screen,
 444                          enum pipe_texture_target target,
 445                          unsigned tex_usage,
 446                          unsigned geom_flags)
 447 {
 448    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 449       return PIPE_FORMAT_R16G16B16A16_SNORM;
 450    }
 451    if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 452       return default_rgba_format(screen, target, tex_usage, geom_flags);
 453    else
 454       return PIPE_FORMAT_NONE;
 455 }
 456
 457
 458 /**
 459  * Find an Z format supported by the context/winsys.
 460  */
 461 static enum pipe_format
 462 default_depth_format(struct pipe_screen *screen,
 463                      enum pipe_texture_target target,
 464                      unsigned tex_usage,
 465                      unsigned geom_flags)
 466 {
 467    static const enum pipe_format zFormats[] = {
 468       PIPE_FORMAT_Z16_UNORM,
 469       PIPE_FORMAT_Z32_UNORM,
 470       PIPE_FORMAT_S8Z24_UNORM,
 471       PIPE_FORMAT_Z24S8_UNORM
 472    };
 473    uint i;
 474    for (i = 0; i < Elements(zFormats); i++) {
 475       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 476          return zFormats[i];
 477       }
 478    }
 479    return PIPE_FORMAT_NONE;
 480 }
 481
 482
 483 /**
 484  * Given an OpenGL internalFormat value for a texture or surface, return
 485  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 486  * \param target  one of PIPE_TEXTURE_x
 487  * \param tex_usage  either PIPE_TEXTURE_USAGE_RENDER_TARGET
 488  *                   or PIPE_TEXTURE_USAGE_SAMPLER
 489  */
 490 enum pipe_format
 491 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 492                  enum pipe_texture_target target, unsigned tex_usage)
 493 {
 494    unsigned geom_flags = 0;
 495
 496    switch (internalFormat) {
 497    case 4:
 498    case GL_RGBA:
 499    case GL_COMPRESSED_RGBA:
 500    case GL_RGBA8:
 501    case GL_RGB10_A2:
 502    case GL_RGBA12:
 503       return default_rgba_format( screen, target, tex_usage, geom_flags );
 504    case 3:
 505    case GL_RGB:
 506    case GL_COMPRESSED_RGB:
 507       return default_rgb_format( screen, target, tex_usage, geom_flags );
 508    case GL_RGBA16:
 509       if (tex_usage & PIPE_TEXTURE_USAGE_RENDER_TARGET)
 510          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 511       else
 512          return default_rgba_format( screen, target, tex_usage, geom_flags );
 513
 514    case GL_RGBA4:
 515    case GL_RGBA2:
 516       if (screen->is_format_supported( screen, PIPE_FORMAT_A4R4G4B4_UNORM, target, tex_usage, geom_flags ))
 517          return PIPE_FORMAT_A4R4G4B4_UNORM;
 518       return default_rgba_format( screen, target, tex_usage, geom_flags );
 519
 520    case GL_RGB5_A1:
 521       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 522          return PIPE_FORMAT_A1R5G5B5_UNORM;
 523       return default_rgba_format( screen, target, tex_usage, geom_flags );
 524
 525    case GL_RGB8:
 526    case GL_RGB10:
 527    case GL_RGB12:
 528    case GL_RGB16:
 529       return default_rgb_format( screen, target, tex_usage, geom_flags );
 530
 531    case GL_RGB5:
 532    case GL_RGB4:
 533    case GL_R3_G3_B2:
 534       if (screen->is_format_supported( screen, PIPE_FORMAT_R5G6B5_UNORM, target, tex_usage, geom_flags ))
 535          return PIPE_FORMAT_R5G6B5_UNORM;
 536       if (screen->is_format_supported( screen, PIPE_FORMAT_A1R5G5B5_UNORM, target, tex_usage, geom_flags ))
 537          return PIPE_FORMAT_A1R5G5B5_UNORM;
 538       return default_rgba_format( screen, target, tex_usage, geom_flags );
 539
 540    case GL_ALPHA:
 541    case GL_ALPHA4:
 542    case GL_ALPHA8:
 543    case GL_ALPHA12:
 544    case GL_ALPHA16:
 545    case GL_COMPRESSED_ALPHA:
 546       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 547          return PIPE_FORMAT_A8_UNORM;
 548       return default_rgba_format( screen, target, tex_usage, geom_flags );
 549
 550    case 1:
 551    case GL_LUMINANCE:
 552    case GL_LUMINANCE4:
 553    case GL_LUMINANCE8:
 554    case GL_LUMINANCE12:
 555    case GL_LUMINANCE16:
 556    case GL_COMPRESSED_LUMINANCE:
 557       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 558          return PIPE_FORMAT_L8_UNORM;
 559       return default_rgba_format( screen, target, tex_usage, geom_flags );
 560
 561    case 2:
 562    case GL_LUMINANCE_ALPHA:
 563    case GL_LUMINANCE4_ALPHA4:
 564    case GL_LUMINANCE6_ALPHA2:
 565    case GL_LUMINANCE8_ALPHA8:
 566    case GL_LUMINANCE12_ALPHA4:
 567    case GL_LUMINANCE12_ALPHA12:
 568    case GL_LUMINANCE16_ALPHA16:
 569    case GL_COMPRESSED_LUMINANCE_ALPHA:
 570       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_UNORM, target, tex_usage, geom_flags ))
 571          return PIPE_FORMAT_A8L8_UNORM;
 572       return default_rgba_format( screen, target, tex_usage, geom_flags );
 573
 574    case GL_INTENSITY:
 575    case GL_INTENSITY4:
 576    case GL_INTENSITY8:
 577    case GL_INTENSITY12:
 578    case GL_INTENSITY16:
 579    case GL_COMPRESSED_INTENSITY:
 580       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 581          return PIPE_FORMAT_I8_UNORM;
 582       return default_rgba_format( screen, target, tex_usage, geom_flags );
 583
 584    case GL_YCBCR_MESA:
 585       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR,
 586                                       target, tex_usage, geom_flags)) {
 587          return PIPE_FORMAT_YCBCR;
 588       }
 589       if (screen->is_format_supported(screen, PIPE_FORMAT_YCBCR_REV,
 590                                       target, tex_usage, geom_flags)) {
 591          return PIPE_FORMAT_YCBCR_REV;
 592       }
 593       return PIPE_FORMAT_NONE;
 594
 595    case GL_RGB_S3TC:
 596    case GL_RGB4_S3TC:
 597    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 598       return PIPE_FORMAT_DXT1_RGB;
 599
 600    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 601       return PIPE_FORMAT_DXT1_RGBA;
 602
 603    case GL_RGBA_S3TC:
 604    case GL_RGBA4_S3TC:
 605    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 606       return PIPE_FORMAT_DXT3_RGBA;
 607
 608    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 609       return PIPE_FORMAT_DXT5_RGBA;
 610
 611 #if 0
 612    case GL_COMPRESSED_RGB_FXT1_3DFX:
 613       return PIPE_FORMAT_RGB_FXT1;
 614    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 615       return PIPE_FORMAT_RGB_FXT1;
 616 #endif
 617
 618    case GL_DEPTH_COMPONENT16:
 619       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 620          return PIPE_FORMAT_Z16_UNORM;
 621       /* fall-through */
 622    case GL_DEPTH_COMPONENT24:
 623       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 624          return PIPE_FORMAT_S8Z24_UNORM;
 625       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 626          return PIPE_FORMAT_Z24S8_UNORM;
 627       /* fall-through */
 628    case GL_DEPTH_COMPONENT32:
 629       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 630          return PIPE_FORMAT_Z32_UNORM;
 631       /* fall-through */
 632    case GL_DEPTH_COMPONENT:
 633       return default_depth_format( screen, target, tex_usage, geom_flags );
 634
 635    case GL_STENCIL_INDEX:
 636    case GL_STENCIL_INDEX1_EXT:
 637    case GL_STENCIL_INDEX4_EXT:
 638    case GL_STENCIL_INDEX8_EXT:
 639    case GL_STENCIL_INDEX16_EXT:
 640       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_UNORM, target, tex_usage, geom_flags ))
 641          return PIPE_FORMAT_S8_UNORM;
 642       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 643          return PIPE_FORMAT_S8Z24_UNORM;
 644       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 645          return PIPE_FORMAT_Z24S8_UNORM;
 646       return PIPE_FORMAT_NONE;
 647
 648    case GL_DEPTH_STENCIL_EXT:
 649    case GL_DEPTH24_STENCIL8_EXT:
 650       if (screen->is_format_supported( screen, PIPE_FORMAT_S8Z24_UNORM, target, tex_usage, geom_flags ))
 651          return PIPE_FORMAT_S8Z24_UNORM;
 652       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24S8_UNORM, target, tex_usage, geom_flags ))
 653          return PIPE_FORMAT_Z24S8_UNORM;
 654       return PIPE_FORMAT_NONE;
 655
 656    case GL_SRGB_EXT:
 657    case GL_SRGB8_EXT:
 658    case GL_COMPRESSED_SRGB_EXT:
 659    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 660    case GL_SRGB_ALPHA_EXT:
 661    case GL_SRGB8_ALPHA8_EXT:
 662       return default_srgba_format( screen, target, tex_usage, geom_flags );
 663    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 664       return PIPE_FORMAT_DXT1_SRGB;
 665    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 666       return PIPE_FORMAT_DXT1_SRGBA;
 667    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 668       return PIPE_FORMAT_DXT3_SRGBA;
 669    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 670       return PIPE_FORMAT_DXT5_SRGBA;
 671
 672    case GL_SLUMINANCE_ALPHA_EXT:
 673    case GL_SLUMINANCE8_ALPHA8_EXT:
 674    case GL_COMPRESSED_SLUMINANCE_EXT:
 675    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 676       if (screen->is_format_supported( screen, PIPE_FORMAT_A8L8_SRGB, target, tex_usage, geom_flags ))
 677          return PIPE_FORMAT_A8L8_SRGB;
 678       return default_srgba_format( screen, target, tex_usage, geom_flags );
 679
 680    case GL_SLUMINANCE_EXT:
 681    case GL_SLUMINANCE8_EXT:
 682       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 683          return PIPE_FORMAT_L8_SRGB;
 684       return default_srgba_format( screen, target, tex_usage, geom_flags );
 685
 686    default:
 687       return PIPE_FORMAT_NONE;
 688    }
 689 }
 690
 691
 692 static GLboolean
 693 is_depth_or_stencil_format(GLenum internalFormat)
 694 {
 695    switch (internalFormat) {
 696    case GL_DEPTH_COMPONENT:
 697    case GL_DEPTH_COMPONENT16:
 698    case GL_DEPTH_COMPONENT24:
 699    case GL_DEPTH_COMPONENT32:
 700    case GL_STENCIL_INDEX:
 701    case GL_STENCIL_INDEX1_EXT:
 702    case GL_STENCIL_INDEX4_EXT:
 703    case GL_STENCIL_INDEX8_EXT:
 704    case GL_STENCIL_INDEX16_EXT:
 705    case GL_DEPTH_STENCIL_EXT:
 706    case GL_DEPTH24_STENCIL8_EXT:
 707       return GL_TRUE;
 708    default:
 709       return GL_FALSE;
 710    }
 711 }
 712
 713 /**
 714  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 715  */
 716 enum pipe_format
 717 st_choose_renderbuffer_format(struct pipe_screen *screen,
 718                               GLenum internalFormat)
 719 {
 720    uint usage;
 721    if (is_depth_or_stencil_format(internalFormat))
 722       usage = PIPE_TEXTURE_USAGE_DEPTH_STENCIL;
 723    else
 724       usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
 725    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 726 }
 727
 728
 729 static gl_format
 730 translate_gallium_format_to_mesa_format(enum pipe_format format)
 731 {
 732    switch (format) {
 733    case PIPE_FORMAT_A8R8G8B8_UNORM:
 734       return MESA_FORMAT_ARGB8888;
 735    case PIPE_FORMAT_X8R8G8B8_UNORM:
 736       return MESA_FORMAT_XRGB8888;
 737    case PIPE_FORMAT_A1R5G5B5_UNORM:
 738       return MESA_FORMAT_ARGB1555;
 739    case PIPE_FORMAT_A4R4G4B4_UNORM:
 740       return MESA_FORMAT_ARGB4444;
 741    case PIPE_FORMAT_R5G6B5_UNORM:
 742       return MESA_FORMAT_RGB565;
 743    case PIPE_FORMAT_A8L8_UNORM:
 744       return MESA_FORMAT_AL88;
 745    case PIPE_FORMAT_A8_UNORM:
 746       return MESA_FORMAT_A8;
 747    case PIPE_FORMAT_L8_UNORM:
 748       return MESA_FORMAT_L8;
 749    case PIPE_FORMAT_I8_UNORM:
 750       return MESA_FORMAT_I8;
 751    case PIPE_FORMAT_Z16_UNORM:
 752       return MESA_FORMAT_Z16;
 753    case PIPE_FORMAT_Z32_UNORM:
 754       return MESA_FORMAT_Z32;
 755    case PIPE_FORMAT_Z24S8_UNORM:
 756       return MESA_FORMAT_Z24_S8;
 757    case PIPE_FORMAT_X8Z24_UNORM:
 758       return MESA_FORMAT_X8_Z24;
 759    case PIPE_FORMAT_S8Z24_UNORM:
 760       return MESA_FORMAT_S8_Z24;
 761    case PIPE_FORMAT_YCBCR:
 762       return MESA_FORMAT_YCBCR;
 763    case PIPE_FORMAT_YCBCR_REV:
 764       return MESA_FORMAT_YCBCR_REV;
 765 #if FEATURE_texture_s3tc
 766    case PIPE_FORMAT_DXT1_RGB:
 767       return MESA_FORMAT_RGB_DXT1;
 768    case PIPE_FORMAT_DXT1_RGBA:
 769       return MESA_FORMAT_RGBA_DXT1;
 770    case PIPE_FORMAT_DXT3_RGBA:
 771       return MESA_FORMAT_RGBA_DXT3;
 772    case PIPE_FORMAT_DXT5_RGBA:
 773       return MESA_FORMAT_RGBA_DXT5;
 774 #if FEATURE_EXT_texture_sRGB
 775    case PIPE_FORMAT_DXT1_SRGB:
 776       return MESA_FORMAT_SRGB_DXT1;
 777    case PIPE_FORMAT_DXT1_SRGBA:
 778       return MESA_FORMAT_SRGBA_DXT1;
 779    case PIPE_FORMAT_DXT3_SRGBA:
 780       return MESA_FORMAT_SRGBA_DXT3;
 781    case PIPE_FORMAT_DXT5_SRGBA:
 782       return MESA_FORMAT_SRGBA_DXT5;
 783 #endif
 784 #endif
 785 #if FEATURE_EXT_texture_sRGB
 786    case PIPE_FORMAT_A8L8_SRGB:
 787       return MESA_FORMAT_SLA8;
 788    case PIPE_FORMAT_L8_SRGB:
 789       return MESA_FORMAT_SL8;
 790    case PIPE_FORMAT_R8G8B8_SRGB:
 791       return MESA_FORMAT_SRGB8;
 792    case PIPE_FORMAT_R8G8B8A8_SRGB:
 793       return MESA_FORMAT_SRGBA8;
 794    case PIPE_FORMAT_A8R8G8B8_SRGB:
 795       return MESA_FORMAT_SARGB8;
 796 #endif
 797    /* XXX add additional cases */
 798    default:
 799       assert(0);
 800       return MESA_FORMAT_NONE;
 801    }
 802 }
 803
 804
 805 /**
 806  * Called via ctx->Driver.chooseTextureFormat().
 807  */
 808 gl_format
 809 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 810                        GLenum format, GLenum type)
 811 {
 812    enum pipe_format pFormat;
 813
 814    (void) format;
 815    (void) type;
 816
 817    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 818                               PIPE_TEXTURE_2D, PIPE_TEXTURE_USAGE_SAMPLER);
 819    if (pFormat == PIPE_FORMAT_NONE)
 820       return MESA_FORMAT_NONE;
 821
 822    return translate_gallium_format_to_mesa_format(pFormat);
 823 }
 824
 825
 826 /**
 827  * Test if a gallium format is equivalent to a GL format/type.
 828  */
 829 GLboolean
 830 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 831 {
 832    switch (pFormat) {
 833    case PIPE_FORMAT_R8G8B8A8_UNORM:
 834       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 835    case PIPE_FORMAT_B8G8R8A8_UNORM:
 836       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 837    case PIPE_FORMAT_R5G6B5_UNORM:
 838       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 839    /* XXX more combos... */
 840    default:
 841       return GL_FALSE;
 842    }
 843 }