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/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
  63 /**
  64  * Return basic GL datatype for the given gallium format.
  65  */
  66 GLenum
  67 st_format_datatype(enum pipe_format format)
  68 {
  69    const struct util_format_description *desc;
  70
  71    desc = util_format_description(format);
  72    assert(desc);
  73
  74    if (desc->layout == UTIL_FORMAT_LAYOUT_PLAIN) {
  75       if (format == PIPE_FORMAT_B5G5R5A1_UNORM ||
  76           format == PIPE_FORMAT_B5G6R5_UNORM) {
  77          return GL_UNSIGNED_SHORT;
  78       }
  79       else if (format == PIPE_FORMAT_Z24_UNORM_S8_USCALED ||
  80                format == PIPE_FORMAT_S8_USCALED_Z24_UNORM) {
  81          return GL_UNSIGNED_INT_24_8;
  82       }
  83       else {
  84          const GLuint size = format_max_bits(format);
  85          if (size == 8) {
  86             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  87                return GL_UNSIGNED_BYTE;
  88             else
  89                return GL_BYTE;
  90          }
  91          else if (size == 16) {
  92             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
  93                return GL_UNSIGNED_SHORT;
  94             else
  95                return GL_SHORT;
  96          }
  97          else {
  98             assert( size <= 32 );
  99             if (desc->channel[0].type == UTIL_FORMAT_TYPE_UNSIGNED)
 100                return GL_UNSIGNED_INT;
 101             else
 102                return GL_INT;
 103          }
 104       }
 105    }
 106    else if (format == PIPE_FORMAT_UYVY) {
 107       return GL_UNSIGNED_SHORT;
 108    }
 109    else if (format == PIPE_FORMAT_YUYV) {
 110       return GL_UNSIGNED_SHORT;
 111    }
 112    else {
 113       /* compressed format? */
 114       assert(0);
 115    }
 116
 117    assert(0);
 118    return GL_NONE;
 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_AL88:
 148       return PIPE_FORMAT_L8A8_UNORM;
 149    case MESA_FORMAT_A8:
 150       return PIPE_FORMAT_A8_UNORM;
 151    case MESA_FORMAT_L8:
 152       return PIPE_FORMAT_L8_UNORM;
 153    case MESA_FORMAT_I8:
 154       return PIPE_FORMAT_I8_UNORM;
 155    case MESA_FORMAT_Z16:
 156       return PIPE_FORMAT_Z16_UNORM;
 157    case MESA_FORMAT_Z32:
 158       return PIPE_FORMAT_Z32_UNORM;
 159    case MESA_FORMAT_Z24_S8:
 160       return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 161    case MESA_FORMAT_S8_Z24:
 162       return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 163    case MESA_FORMAT_YCBCR:
 164       return PIPE_FORMAT_UYVY;
 165 #if FEATURE_texture_s3tc
 166    case MESA_FORMAT_RGB_DXT1:
 167       return PIPE_FORMAT_DXT1_RGB;
 168    case MESA_FORMAT_RGBA_DXT1:
 169       return PIPE_FORMAT_DXT1_RGBA;
 170    case MESA_FORMAT_RGBA_DXT3:
 171       return PIPE_FORMAT_DXT3_RGBA;
 172    case MESA_FORMAT_RGBA_DXT5:
 173       return PIPE_FORMAT_DXT5_RGBA;
 174 #if FEATURE_EXT_texture_sRGB
 175    case MESA_FORMAT_SRGB_DXT1:
 176       return PIPE_FORMAT_DXT1_SRGB;
 177    case MESA_FORMAT_SRGBA_DXT1:
 178       return PIPE_FORMAT_DXT1_SRGBA;
 179    case MESA_FORMAT_SRGBA_DXT3:
 180       return PIPE_FORMAT_DXT3_SRGBA;
 181    case MESA_FORMAT_SRGBA_DXT5:
 182       return PIPE_FORMAT_DXT5_SRGBA;
 183 #endif
 184 #endif
 185 #if FEATURE_EXT_texture_sRGB
 186    case MESA_FORMAT_SLA8:
 187       return PIPE_FORMAT_L8A8_SRGB;
 188    case MESA_FORMAT_SL8:
 189       return PIPE_FORMAT_L8_SRGB;
 190    case MESA_FORMAT_SRGB8:
 191       return PIPE_FORMAT_R8G8B8_SRGB;
 192    case MESA_FORMAT_SRGBA8:
 193       return PIPE_FORMAT_A8B8G8R8_SRGB;
 194    case MESA_FORMAT_SARGB8:
 195       return PIPE_FORMAT_B8G8R8A8_SRGB;
 196 #endif
 197    default:
 198       assert(0);
 199       return PIPE_FORMAT_NONE;
 200    }
 201 }
 202
 203
 204 /**
 205  * Translate Gallium format to Mesa format.
 206  */
 207 gl_format
 208 st_pipe_format_to_mesa_format(enum pipe_format format)
 209 {
 210    switch (format) {
 211    case PIPE_FORMAT_A8B8G8R8_UNORM:
 212       return MESA_FORMAT_RGBA8888;
 213    case PIPE_FORMAT_R8G8B8A8_UNORM:
 214       return MESA_FORMAT_RGBA8888_REV;
 215    case PIPE_FORMAT_B8G8R8A8_UNORM:
 216       return MESA_FORMAT_ARGB8888;
 217    case PIPE_FORMAT_A8R8G8B8_UNORM:
 218       return MESA_FORMAT_ARGB8888_REV;
 219    case PIPE_FORMAT_B8G8R8X8_UNORM:
 220       return MESA_FORMAT_XRGB8888;
 221    case PIPE_FORMAT_X8R8G8B8_UNORM:
 222       return MESA_FORMAT_XRGB8888_REV;
 223    case PIPE_FORMAT_B5G5R5A1_UNORM:
 224       return MESA_FORMAT_ARGB1555;
 225    case PIPE_FORMAT_B4G4R4A4_UNORM:
 226       return MESA_FORMAT_ARGB4444;
 227    case PIPE_FORMAT_B5G6R5_UNORM:
 228       return MESA_FORMAT_RGB565;
 229    case PIPE_FORMAT_L8A8_UNORM:
 230       return MESA_FORMAT_AL88;
 231    case PIPE_FORMAT_A8_UNORM:
 232       return MESA_FORMAT_A8;
 233    case PIPE_FORMAT_L8_UNORM:
 234       return MESA_FORMAT_L8;
 235    case PIPE_FORMAT_I8_UNORM:
 236       return MESA_FORMAT_I8;
 237    case PIPE_FORMAT_S8_USCALED:
 238       return MESA_FORMAT_S8;
 239
 240    case PIPE_FORMAT_R16G16B16A16_SNORM:
 241       return MESA_FORMAT_SIGNED_RGBA_16;
 242
 243    case PIPE_FORMAT_Z16_UNORM:
 244       return MESA_FORMAT_Z16;
 245    case PIPE_FORMAT_Z32_UNORM:
 246       return MESA_FORMAT_Z32;
 247    case PIPE_FORMAT_S8_USCALED_Z24_UNORM:
 248       return MESA_FORMAT_Z24_S8;
 249    case PIPE_FORMAT_X8Z24_UNORM:
 250       return MESA_FORMAT_Z24_X8;
 251    case PIPE_FORMAT_Z24X8_UNORM:
 252       return MESA_FORMAT_X8_Z24;
 253    case PIPE_FORMAT_Z24_UNORM_S8_USCALED:
 254       return MESA_FORMAT_S8_Z24;
 255
 256    case PIPE_FORMAT_UYVY:
 257       return MESA_FORMAT_YCBCR;
 258    case PIPE_FORMAT_YUYV:
 259       return MESA_FORMAT_YCBCR_REV;
 260
 261 #if FEATURE_texture_s3tc
 262    case PIPE_FORMAT_DXT1_RGB:
 263       return MESA_FORMAT_RGB_DXT1;
 264    case PIPE_FORMAT_DXT1_RGBA:
 265       return MESA_FORMAT_RGBA_DXT1;
 266    case PIPE_FORMAT_DXT3_RGBA:
 267       return MESA_FORMAT_RGBA_DXT3;
 268    case PIPE_FORMAT_DXT5_RGBA:
 269       return MESA_FORMAT_RGBA_DXT5;
 270 #if FEATURE_EXT_texture_sRGB
 271    case PIPE_FORMAT_DXT1_SRGB:
 272       return MESA_FORMAT_SRGB_DXT1;
 273    case PIPE_FORMAT_DXT1_SRGBA:
 274       return MESA_FORMAT_SRGBA_DXT1;
 275    case PIPE_FORMAT_DXT3_SRGBA:
 276       return MESA_FORMAT_SRGBA_DXT3;
 277    case PIPE_FORMAT_DXT5_SRGBA:
 278       return MESA_FORMAT_SRGBA_DXT5;
 279 #endif
 280 #endif
 281
 282 #if FEATURE_EXT_texture_sRGB
 283    case PIPE_FORMAT_L8A8_SRGB:
 284       return MESA_FORMAT_SLA8;
 285    case PIPE_FORMAT_L8_SRGB:
 286       return MESA_FORMAT_SL8;
 287    case PIPE_FORMAT_R8G8B8_SRGB:
 288       return MESA_FORMAT_SRGB8;
 289    case PIPE_FORMAT_A8B8G8R8_SRGB:
 290       return MESA_FORMAT_SRGBA8;
 291    case PIPE_FORMAT_B8G8R8A8_SRGB:
 292       return MESA_FORMAT_SARGB8;
 293 #endif
 294    default:
 295       assert(0);
 296       return MESA_FORMAT_NONE;
 297    }
 298 }
 299
 300
 301 /**
 302  * Find an RGBA format supported by the context/winsys.
 303  */
 304 static enum pipe_format
 305 default_rgba_format(struct pipe_screen *screen,
 306                     enum pipe_texture_target target,
 307                     unsigned tex_usage,
 308                     unsigned geom_flags)
 309 {
 310    static const enum pipe_format colorFormats[] = {
 311       PIPE_FORMAT_B8G8R8A8_UNORM,
 312       PIPE_FORMAT_A8R8G8B8_UNORM,
 313       PIPE_FORMAT_A8B8G8R8_UNORM,
 314       PIPE_FORMAT_B5G6R5_UNORM
 315    };
 316    uint i;
 317    for (i = 0; i < Elements(colorFormats); i++) {
 318       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 319          return colorFormats[i];
 320       }
 321    }
 322    return PIPE_FORMAT_NONE;
 323 }
 324
 325 /**
 326  * Find an RGB format supported by the context/winsys.
 327  */
 328 static enum pipe_format
 329 default_rgb_format(struct pipe_screen *screen,
 330                    enum pipe_texture_target target,
 331                    unsigned tex_usage,
 332                    unsigned geom_flags)
 333 {
 334    static const enum pipe_format colorFormats[] = {
 335       PIPE_FORMAT_B8G8R8X8_UNORM,
 336       PIPE_FORMAT_X8R8G8B8_UNORM,
 337       PIPE_FORMAT_X8B8G8R8_UNORM,
 338       PIPE_FORMAT_B8G8R8A8_UNORM,
 339       PIPE_FORMAT_A8R8G8B8_UNORM,
 340       PIPE_FORMAT_A8B8G8R8_UNORM,
 341       PIPE_FORMAT_B5G6R5_UNORM
 342    };
 343    uint i;
 344    for (i = 0; i < Elements(colorFormats); i++) {
 345       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 346          return colorFormats[i];
 347       }
 348    }
 349    return PIPE_FORMAT_NONE;
 350 }
 351
 352 /**
 353  * Find an sRGBA format supported by the context/winsys.
 354  */
 355 static enum pipe_format
 356 default_srgba_format(struct pipe_screen *screen,
 357                     enum pipe_texture_target target,
 358                     unsigned tex_usage,
 359                     unsigned geom_flags)
 360 {
 361    static const enum pipe_format colorFormats[] = {
 362       PIPE_FORMAT_B8G8R8A8_SRGB,
 363       PIPE_FORMAT_A8R8G8B8_SRGB,
 364       PIPE_FORMAT_A8B8G8R8_SRGB,
 365    };
 366    uint i;
 367    for (i = 0; i < Elements(colorFormats); i++) {
 368       if (screen->is_format_supported( screen, colorFormats[i], target, tex_usage, geom_flags )) {
 369          return colorFormats[i];
 370       }
 371    }
 372    return PIPE_FORMAT_NONE;
 373 }
 374
 375 /**
 376  * Search list of formats for first RGBA format with >8 bits/channel.
 377  */
 378 static enum pipe_format
 379 default_deep_rgba_format(struct pipe_screen *screen,
 380                          enum pipe_texture_target target,
 381                          unsigned tex_usage,
 382                          unsigned geom_flags)
 383 {
 384    if (screen->is_format_supported(screen, PIPE_FORMAT_R16G16B16A16_SNORM, target, tex_usage, geom_flags)) {
 385       return PIPE_FORMAT_R16G16B16A16_SNORM;
 386    }
 387    if (tex_usage & PIPE_BIND_RENDER_TARGET)
 388       return default_rgba_format(screen, target, tex_usage, geom_flags);
 389    else
 390       return PIPE_FORMAT_NONE;
 391 }
 392
 393
 394 /**
 395  * Find an Z format supported by the context/winsys.
 396  */
 397 static enum pipe_format
 398 default_depth_format(struct pipe_screen *screen,
 399                      enum pipe_texture_target target,
 400                      unsigned tex_usage,
 401                      unsigned geom_flags)
 402 {
 403    static const enum pipe_format zFormats[] = {
 404       PIPE_FORMAT_Z16_UNORM,
 405       PIPE_FORMAT_Z32_UNORM,
 406       PIPE_FORMAT_Z24_UNORM_S8_USCALED,
 407       PIPE_FORMAT_S8_USCALED_Z24_UNORM
 408    };
 409    uint i;
 410    for (i = 0; i < Elements(zFormats); i++) {
 411       if (screen->is_format_supported( screen, zFormats[i], target, tex_usage, geom_flags )) {
 412          return zFormats[i];
 413       }
 414    }
 415    return PIPE_FORMAT_NONE;
 416 }
 417
 418
 419 /**
 420  * Given an OpenGL internalFormat value for a texture or surface, return
 421  * the best matching PIPE_FORMAT_x, or PIPE_FORMAT_NONE if there's no match.
 422  * \param target  one of PIPE_TEXTURE_x
 423  * \param tex_usage  either PIPE_BIND_RENDER_TARGET
 424  *                   or PIPE_BIND_SAMPLER_VIEW
 425  */
 426 enum pipe_format
 427 st_choose_format(struct pipe_screen *screen, GLenum internalFormat,
 428                  enum pipe_texture_target target, unsigned tex_usage)
 429 {
 430    unsigned geom_flags = 0;
 431
 432    switch (internalFormat) {
 433    case 4:
 434    case GL_RGBA:
 435    case GL_COMPRESSED_RGBA:
 436    case GL_RGBA8:
 437    case GL_RGB10_A2:
 438    case GL_RGBA12:
 439       return default_rgba_format( screen, target, tex_usage, geom_flags );
 440    case 3:
 441    case GL_RGB:
 442    case GL_COMPRESSED_RGB:
 443       return default_rgb_format( screen, target, tex_usage, geom_flags );
 444    case GL_RGBA16:
 445       if (tex_usage & PIPE_BIND_RENDER_TARGET)
 446          return default_deep_rgba_format( screen, target, tex_usage, geom_flags );
 447       else
 448          return default_rgba_format( screen, target, tex_usage, geom_flags );
 449
 450    case GL_RGBA4:
 451    case GL_RGBA2:
 452       if (screen->is_format_supported( screen, PIPE_FORMAT_B4G4R4A4_UNORM, target, tex_usage, geom_flags ))
 453          return PIPE_FORMAT_B4G4R4A4_UNORM;
 454       return default_rgba_format( screen, target, tex_usage, geom_flags );
 455
 456    case GL_RGB5_A1:
 457       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 458          return PIPE_FORMAT_B5G5R5A1_UNORM;
 459       return default_rgba_format( screen, target, tex_usage, geom_flags );
 460
 461    case GL_RGB8:
 462    case GL_RGB10:
 463    case GL_RGB12:
 464    case GL_RGB16:
 465       return default_rgb_format( screen, target, tex_usage, geom_flags );
 466
 467    case GL_RGB5:
 468    case GL_RGB4:
 469    case GL_R3_G3_B2:
 470       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G6R5_UNORM, target, tex_usage, geom_flags ))
 471          return PIPE_FORMAT_B5G6R5_UNORM;
 472       if (screen->is_format_supported( screen, PIPE_FORMAT_B5G5R5A1_UNORM, target, tex_usage, geom_flags ))
 473          return PIPE_FORMAT_B5G5R5A1_UNORM;
 474       return default_rgba_format( screen, target, tex_usage, geom_flags );
 475
 476    case GL_ALPHA:
 477    case GL_ALPHA4:
 478    case GL_ALPHA8:
 479    case GL_ALPHA12:
 480    case GL_ALPHA16:
 481    case GL_COMPRESSED_ALPHA:
 482       if (screen->is_format_supported( screen, PIPE_FORMAT_A8_UNORM, target, tex_usage, geom_flags ))
 483          return PIPE_FORMAT_A8_UNORM;
 484       return default_rgba_format( screen, target, tex_usage, geom_flags );
 485
 486    case 1:
 487    case GL_LUMINANCE:
 488    case GL_LUMINANCE4:
 489    case GL_LUMINANCE8:
 490    case GL_LUMINANCE12:
 491    case GL_LUMINANCE16:
 492    case GL_COMPRESSED_LUMINANCE:
 493       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_UNORM, target, tex_usage, geom_flags ))
 494          return PIPE_FORMAT_L8_UNORM;
 495       return default_rgba_format( screen, target, tex_usage, geom_flags );
 496
 497    case 2:
 498    case GL_LUMINANCE_ALPHA:
 499    case GL_LUMINANCE4_ALPHA4:
 500    case GL_LUMINANCE6_ALPHA2:
 501    case GL_LUMINANCE8_ALPHA8:
 502    case GL_LUMINANCE12_ALPHA4:
 503    case GL_LUMINANCE12_ALPHA12:
 504    case GL_LUMINANCE16_ALPHA16:
 505    case GL_COMPRESSED_LUMINANCE_ALPHA:
 506       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_UNORM, target, tex_usage, geom_flags ))
 507          return PIPE_FORMAT_L8A8_UNORM;
 508       return default_rgba_format( screen, target, tex_usage, geom_flags );
 509
 510    case GL_INTENSITY:
 511    case GL_INTENSITY4:
 512    case GL_INTENSITY8:
 513    case GL_INTENSITY12:
 514    case GL_INTENSITY16:
 515    case GL_COMPRESSED_INTENSITY:
 516       if (screen->is_format_supported( screen, PIPE_FORMAT_I8_UNORM, target, tex_usage, geom_flags ))
 517          return PIPE_FORMAT_I8_UNORM;
 518       return default_rgba_format( screen, target, tex_usage, geom_flags );
 519
 520    case GL_YCBCR_MESA:
 521       if (screen->is_format_supported(screen, PIPE_FORMAT_UYVY,
 522                                       target, tex_usage, geom_flags)) {
 523          return PIPE_FORMAT_UYVY;
 524       }
 525       if (screen->is_format_supported(screen, PIPE_FORMAT_YUYV,
 526                                       target, tex_usage, geom_flags)) {
 527          return PIPE_FORMAT_YUYV;
 528       }
 529       return PIPE_FORMAT_NONE;
 530
 531    case GL_RGB_S3TC:
 532    case GL_RGB4_S3TC:
 533    case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
 534       return PIPE_FORMAT_DXT1_RGB;
 535
 536    case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
 537       return PIPE_FORMAT_DXT1_RGBA;
 538
 539    case GL_RGBA_S3TC:
 540    case GL_RGBA4_S3TC:
 541    case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
 542       return PIPE_FORMAT_DXT3_RGBA;
 543
 544    case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
 545       return PIPE_FORMAT_DXT5_RGBA;
 546
 547 #if 0
 548    case GL_COMPRESSED_RGB_FXT1_3DFX:
 549       return PIPE_FORMAT_RGB_FXT1;
 550    case GL_COMPRESSED_RGBA_FXT1_3DFX:
 551       return PIPE_FORMAT_RGB_FXT1;
 552 #endif
 553
 554    case GL_DEPTH_COMPONENT16:
 555       if (screen->is_format_supported( screen, PIPE_FORMAT_Z16_UNORM, target, tex_usage, geom_flags ))
 556          return PIPE_FORMAT_Z16_UNORM;
 557       /* fall-through */
 558    case GL_DEPTH_COMPONENT24:
 559       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 560          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 561       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 562          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 563       /* fall-through */
 564    case GL_DEPTH_COMPONENT32:
 565       if (screen->is_format_supported( screen, PIPE_FORMAT_Z32_UNORM, target, tex_usage, geom_flags ))
 566          return PIPE_FORMAT_Z32_UNORM;
 567       /* fall-through */
 568    case GL_DEPTH_COMPONENT:
 569       return default_depth_format( screen, target, tex_usage, geom_flags );
 570
 571    case GL_STENCIL_INDEX:
 572    case GL_STENCIL_INDEX1_EXT:
 573    case GL_STENCIL_INDEX4_EXT:
 574    case GL_STENCIL_INDEX8_EXT:
 575    case GL_STENCIL_INDEX16_EXT:
 576       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED, target, tex_usage, geom_flags ))
 577          return PIPE_FORMAT_S8_USCALED;
 578       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 579          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 580       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 581          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 582       return PIPE_FORMAT_NONE;
 583
 584    case GL_DEPTH_STENCIL_EXT:
 585    case GL_DEPTH24_STENCIL8_EXT:
 586       if (screen->is_format_supported( screen, PIPE_FORMAT_Z24_UNORM_S8_USCALED, target, tex_usage, geom_flags ))
 587          return PIPE_FORMAT_Z24_UNORM_S8_USCALED;
 588       if (screen->is_format_supported( screen, PIPE_FORMAT_S8_USCALED_Z24_UNORM, target, tex_usage, geom_flags ))
 589          return PIPE_FORMAT_S8_USCALED_Z24_UNORM;
 590       return PIPE_FORMAT_NONE;
 591
 592    case GL_SRGB_EXT:
 593    case GL_SRGB8_EXT:
 594    case GL_COMPRESSED_SRGB_EXT:
 595    case GL_COMPRESSED_SRGB_ALPHA_EXT:
 596    case GL_SRGB_ALPHA_EXT:
 597    case GL_SRGB8_ALPHA8_EXT:
 598       return default_srgba_format( screen, target, tex_usage, geom_flags );
 599    case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
 600       return PIPE_FORMAT_DXT1_SRGB;
 601    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
 602       return PIPE_FORMAT_DXT1_SRGBA;
 603    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
 604       return PIPE_FORMAT_DXT3_SRGBA;
 605    case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
 606       return PIPE_FORMAT_DXT5_SRGBA;
 607
 608    case GL_SLUMINANCE_ALPHA_EXT:
 609    case GL_SLUMINANCE8_ALPHA8_EXT:
 610    case GL_COMPRESSED_SLUMINANCE_EXT:
 611    case GL_COMPRESSED_SLUMINANCE_ALPHA_EXT:
 612       if (screen->is_format_supported( screen, PIPE_FORMAT_L8A8_SRGB, target, tex_usage, geom_flags ))
 613          return PIPE_FORMAT_L8A8_SRGB;
 614       return default_srgba_format( screen, target, tex_usage, geom_flags );
 615
 616    case GL_SLUMINANCE_EXT:
 617    case GL_SLUMINANCE8_EXT:
 618       if (screen->is_format_supported( screen, PIPE_FORMAT_L8_SRGB, target, tex_usage, geom_flags ))
 619          return PIPE_FORMAT_L8_SRGB;
 620       return default_srgba_format( screen, target, tex_usage, geom_flags );
 621
 622    default:
 623       return PIPE_FORMAT_NONE;
 624    }
 625 }
 626
 627
 628 static GLboolean
 629 is_depth_or_stencil_format(GLenum internalFormat)
 630 {
 631    switch (internalFormat) {
 632    case GL_DEPTH_COMPONENT:
 633    case GL_DEPTH_COMPONENT16:
 634    case GL_DEPTH_COMPONENT24:
 635    case GL_DEPTH_COMPONENT32:
 636    case GL_STENCIL_INDEX:
 637    case GL_STENCIL_INDEX1_EXT:
 638    case GL_STENCIL_INDEX4_EXT:
 639    case GL_STENCIL_INDEX8_EXT:
 640    case GL_STENCIL_INDEX16_EXT:
 641    case GL_DEPTH_STENCIL_EXT:
 642    case GL_DEPTH24_STENCIL8_EXT:
 643       return GL_TRUE;
 644    default:
 645       return GL_FALSE;
 646    }
 647 }
 648
 649 /**
 650  * Called by FBO code to choose a PIPE_FORMAT_ for drawing surfaces.
 651  */
 652 enum pipe_format
 653 st_choose_renderbuffer_format(struct pipe_screen *screen,
 654                               GLenum internalFormat)
 655 {
 656    uint usage;
 657    if (is_depth_or_stencil_format(internalFormat))
 658       usage = PIPE_BIND_DEPTH_STENCIL;
 659    else
 660       usage = PIPE_BIND_RENDER_TARGET;
 661    return st_choose_format(screen, internalFormat, PIPE_TEXTURE_2D, usage);
 662 }
 663
 664
 665 /**
 666  * Called via ctx->Driver.chooseTextureFormat().
 667  */
 668 gl_format
 669 st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 670                        GLenum format, GLenum type)
 671 {
 672    enum pipe_format pFormat;
 673
 674    (void) format;
 675    (void) type;
 676
 677    pFormat = st_choose_format(ctx->st->pipe->screen, internalFormat,
 678                               PIPE_TEXTURE_2D, PIPE_BIND_SAMPLER_VIEW);
 679    if (pFormat == PIPE_FORMAT_NONE)
 680       return MESA_FORMAT_NONE;
 681
 682    return st_pipe_format_to_mesa_format(pFormat);
 683 }
 684
 685
 686 /**
 687  * Test if a gallium format is equivalent to a GL format/type.
 688  */
 689 GLboolean
 690 st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
 691 {
 692    switch (pFormat) {
 693    case PIPE_FORMAT_A8B8G8R8_UNORM:
 694       return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
 695    case PIPE_FORMAT_A8R8G8B8_UNORM:
 696       return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
 697    case PIPE_FORMAT_B5G6R5_UNORM:
 698       return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
 699    /* XXX more combos... */
 700    default:
 701       return GL_FALSE;
 702    }
 703 }