src/gallium/state_trackers/python/st_sample.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * The above copyright notice and this permission notice (including the
  15  * next paragraph) shall be included in all copies or substantial portions
  16  * of the Software.
  17  *
  18  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  19  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  20  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
  21  * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
  22  * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
  23  * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  24  * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  **************************************************************************/
  27
  28
  29 #include "pipe/p_compiler.h"
  30 #include "pipe/p_format.h"
  31 #include "pipe/p_state.h"
  32 #include "pipe/p_inlines.h"
  33 #include "util/u_tile.h"
  34 #include "util/u_math.h"
  35 #include "util/u_memory.h"
  36
  37 #include "st_sample.h"
  38
  39
  40 /**
  41  * Use our own pseudo random generator to ensure consistent runs among
  42  * multiple runs and platforms.
  43  *
  44  * @sa http://en.wikipedia.org/wiki/Linear_congruential_generator
  45  */
  46 static uint32_t st_random(void) {
  47    static uint64_t seed = UINT64_C(0xbb9a063afb0a739d);
  48
  49    seed = UINT64_C(134775813) * seed + UINT64_C(1);
  50
  51    return (uint16_t)(seed >> 32);
  52 }
  53
  54
  55 /**
  56  * We don't want to include the patent-encumbered DXT code here, so instead
  57  * we store several uncompressed/compressed data pairs for hardware testing
  58  * purposes.
  59  */
  60 struct dxt_data
  61 {
  62    uint8_t rgba[16*4];
  63    uint8_t raw[16];
  64 };
  65
  66
  67 static const struct dxt_data
  68 dxt1_rgb_data[] = {
  69    {
  70       {
  71          0x99, 0xb0, 0x8e, 0xff,
  72          0x5d, 0x62, 0x89, 0xff,
  73          0x99, 0xb0, 0x8e, 0xff,
  74          0x99, 0xb0, 0x8e, 0xff,
  75          0xd6, 0xff, 0x94, 0xff,
  76          0x5d, 0x62, 0x89, 0xff,
  77          0x99, 0xb0, 0x8e, 0xff,
  78          0xd6, 0xff, 0x94, 0xff,
  79          0x5d, 0x62, 0x89, 0xff,
  80          0x5d, 0x62, 0x89, 0xff,
  81          0x99, 0xb0, 0x8e, 0xff,
  82          0x21, 0x14, 0x84, 0xff,
  83          0x5d, 0x62, 0x89, 0xff,
  84          0x21, 0x14, 0x84, 0xff,
  85          0x21, 0x14, 0x84, 0xff,
  86          0x99, 0xb0, 0x8e, 0xff
  87       },
  88       {0xf2, 0xd7, 0xb0, 0x20, 0xae, 0x2c, 0x6f, 0x97}
  89    },
  90    {
  91       {
  92          0xb5, 0xcf, 0x9c, 0xff,
  93          0x83, 0x8c, 0x8b, 0xff,
  94          0x21, 0x08, 0x6b, 0xff,
  95          0x83, 0x8c, 0x8b, 0xff,
  96          0x52, 0x4a, 0x7b, 0xff,
  97          0x83, 0x8c, 0x8b, 0xff,
  98          0x83, 0x8c, 0x8b, 0xff,
  99          0xb5, 0xcf, 0x9c, 0xff,
 100          0x21, 0x08, 0x6b, 0xff,
 101          0xb5, 0xcf, 0x9c, 0xff,
 102          0x83, 0x8c, 0x8b, 0xff,
 103          0x52, 0x4a, 0x7b, 0xff,
 104          0xb5, 0xcf, 0x9c, 0xff,
 105          0x83, 0x8c, 0x8b, 0xff,
 106          0x52, 0x4a, 0x7b, 0xff,
 107          0x83, 0x8c, 0x8b, 0xff
 108       },
 109       {0x73, 0xb6, 0x4d, 0x20, 0x98, 0x2b, 0xe1, 0xb8}
 110    },
 111    {
 112       {
 113          0x00, 0x2c, 0xff, 0xff,
 114          0x94, 0x8d, 0x7b, 0xff,
 115          0x4a, 0x5c, 0xbd, 0xff,
 116          0x4a, 0x5c, 0xbd, 0xff,
 117          0x4a, 0x5c, 0xbd, 0xff,
 118          0x94, 0x8d, 0x7b, 0xff,
 119          0x94, 0x8d, 0x7b, 0xff,
 120          0x94, 0x8d, 0x7b, 0xff,
 121          0xde, 0xbe, 0x39, 0xff,
 122          0x94, 0x8d, 0x7b, 0xff,
 123          0xde, 0xbe, 0x39, 0xff,
 124          0xde, 0xbe, 0x39, 0xff,
 125          0xde, 0xbe, 0x39, 0xff,
 126          0xde, 0xbe, 0x39, 0xff,
 127          0xde, 0xbe, 0x39, 0xff,
 128          0x94, 0x8d, 0x7b, 0xff
 129       },
 130       {0xe7, 0xdd, 0x7f, 0x01, 0xf9, 0xab, 0x08, 0x80}
 131    },
 132    {
 133       {
 134          0x6b, 0x24, 0x21, 0xff,
 135          0x7b, 0x4f, 0x5d, 0xff,
 136          0x7b, 0x4f, 0x5d, 0xff,
 137          0x8b, 0x7a, 0x99, 0xff,
 138          0x7b, 0x4f, 0x5d, 0xff,
 139          0x7b, 0x4f, 0x5d, 0xff,
 140          0x6b, 0x24, 0x21, 0xff,
 141          0x8b, 0x7a, 0x99, 0xff,
 142          0x9c, 0xa6, 0xd6, 0xff,
 143          0x6b, 0x24, 0x21, 0xff,
 144          0x7b, 0x4f, 0x5d, 0xff,
 145          0x8b, 0x7a, 0x99, 0xff,
 146          0x6b, 0x24, 0x21, 0xff,
 147          0x8b, 0x7a, 0x99, 0xff,
 148          0x7b, 0x4f, 0x5d, 0xff,
 149          0x9c, 0xa6, 0xd6, 0xff
 150       },
 151       {0x3a, 0x9d, 0x24, 0x69, 0xbd, 0x9f, 0xb4, 0x39}
 152    }
 153 };
 154
 155
 156 static const struct dxt_data
 157 dxt1_rgba_data[] = {
 158    {
 159       {
 160          0x00, 0x00, 0x00, 0x00,
 161          0x4e, 0xaa, 0x90, 0xff,
 162          0x4e, 0xaa, 0x90, 0xff,
 163          0x00, 0x00, 0x00, 0x00,
 164          0x4e, 0xaa, 0x90, 0xff,
 165          0x29, 0xff, 0xff, 0xff,
 166          0x00, 0x00, 0x00, 0x00,
 167          0x4e, 0xaa, 0x90, 0xff,
 168          0x73, 0x55, 0x21, 0xff,
 169          0x00, 0x00, 0x00, 0x00,
 170          0x00, 0x00, 0x00, 0x00,
 171          0x4e, 0xaa, 0x90, 0xff,
 172          0x4e, 0xaa, 0x90, 0xff,
 173          0x00, 0x00, 0x00, 0x00,
 174          0x00, 0x00, 0x00, 0x00,
 175          0x4e, 0xaa, 0x90, 0xff
 176       },
 177       {0xff, 0x2f, 0xa4, 0x72, 0xeb, 0xb2, 0xbd, 0xbe}
 178    },
 179    {
 180       {
 181          0xb5, 0xe3, 0x63, 0xff,
 182          0x00, 0x00, 0x00, 0x00,
 183          0x6b, 0x24, 0x84, 0xff,
 184          0xb5, 0xe3, 0x63, 0xff,
 185          0x00, 0x00, 0x00, 0x00,
 186          0xb5, 0xe3, 0x63, 0xff,
 187          0x00, 0x00, 0x00, 0x00,
 188          0x00, 0x00, 0x00, 0x00,
 189          0x00, 0x00, 0x00, 0x00,
 190          0x00, 0x00, 0x00, 0x00,
 191          0x6b, 0x24, 0x84, 0xff,
 192          0x6b, 0x24, 0x84, 0xff,
 193          0x00, 0x00, 0x00, 0x00,
 194          0xb5, 0xe3, 0x63, 0xff,
 195          0x90, 0x83, 0x73, 0xff,
 196          0xb5, 0xe3, 0x63, 0xff
 197       },
 198       {0x30, 0x69, 0x0c, 0xb7, 0x4d, 0xf7, 0x0f, 0x67}
 199    },
 200    {
 201       {
 202          0x00, 0x00, 0x00, 0x00,
 203          0xc6, 0x86, 0x8c, 0xff,
 204          0xc6, 0x86, 0x8c, 0xff,
 205          0x21, 0x65, 0x42, 0xff,
 206          0x21, 0x65, 0x42, 0xff,
 207          0x21, 0x65, 0x42, 0xff,
 208          0x21, 0x65, 0x42, 0xff,
 209          0x00, 0x00, 0x00, 0x00,
 210          0x00, 0x00, 0x00, 0x00,
 211          0x21, 0x65, 0x42, 0xff,
 212          0xc6, 0x86, 0x8c, 0xff,
 213          0x00, 0x00, 0x00, 0x00,
 214          0x00, 0x00, 0x00, 0x00,
 215          0x00, 0x00, 0x00, 0x00,
 216          0x00, 0x00, 0x00, 0x00,
 217          0xc6, 0x86, 0x8c, 0xff
 218       },
 219       {0x28, 0x23, 0x31, 0xc4, 0x17, 0xc0, 0xd3, 0x7f}
 220    },
 221    {
 222       {
 223          0x00, 0x00, 0x00, 0x00,
 224          0x00, 0x00, 0x00, 0x00,
 225          0x00, 0x00, 0x00, 0x00,
 226          0xc6, 0xe3, 0x9c, 0xff,
 227          0x7b, 0x1c, 0x52, 0xff,
 228          0x00, 0x00, 0x00, 0x00,
 229          0x00, 0x00, 0x00, 0x00,
 230          0x00, 0x00, 0x00, 0x00,
 231          0x00, 0x00, 0x00, 0x00,
 232          0x7b, 0x1c, 0x52, 0xff,
 233          0x00, 0x00, 0x00, 0x00,
 234          0x7b, 0x1c, 0x52, 0xff,
 235          0xa0, 0x7f, 0x77, 0xff,
 236          0xc6, 0xe3, 0x9c, 0xff,
 237          0x00, 0x00, 0x00, 0x00,
 238          0xa0, 0x7f, 0x77, 0xff
 239       },
 240       {0xea, 0x78, 0x13, 0xc7, 0x7f, 0xfc, 0x33, 0xb6}
 241    },
 242 };
 243
 244
 245 static const struct dxt_data
 246 dxt3_rgba_data[] = {
 247    {
 248       {
 249          0x6d, 0xc6, 0x96, 0x77,
 250          0x6d, 0xc6, 0x96, 0xee,
 251          0x6d, 0xc6, 0x96, 0xaa,
 252          0x8c, 0xff, 0xb5, 0x44,
 253          0x6d, 0xc6, 0x96, 0xff,
 254          0x6d, 0xc6, 0x96, 0x88,
 255          0x31, 0x55, 0x5a, 0x66,
 256          0x6d, 0xc6, 0x96, 0x99,
 257          0x31, 0x55, 0x5a, 0xbb,
 258          0x31, 0x55, 0x5a, 0x55,
 259          0x31, 0x55, 0x5a, 0x11,
 260          0x6d, 0xc6, 0x96, 0xcc,
 261          0x6d, 0xc6, 0x96, 0xcc,
 262          0x6d, 0xc6, 0x96, 0x11,
 263          0x31, 0x55, 0x5a, 0x44,
 264          0x31, 0x55, 0x5a, 0x88
 265       },
 266       {0xe7, 0x4a, 0x8f, 0x96, 0x5b, 0xc1, 0x1c, 0x84, 0xf6, 0x8f, 0xab, 0x32, 0x2a, 0x9a, 0x95, 0x5a}
 267    },
 268    {
 269       {
 270          0xad, 0xeb, 0x73, 0x99,
 271          0x97, 0xaa, 0x86, 0x66,
 272          0x6b, 0x28, 0xad, 0x99,
 273          0xad, 0xeb, 0x73, 0x99,
 274          0x6b, 0x28, 0xad, 0x22,
 275          0xad, 0xeb, 0x73, 0xff,
 276          0x97, 0xaa, 0x86, 0x55,
 277          0x6b, 0x28, 0xad, 0x55,
 278          0x6b, 0x28, 0xad, 0x44,
 279          0xad, 0xeb, 0x73, 0x33,
 280          0x6b, 0x28, 0xad, 0xee,
 281          0x6b, 0x28, 0xad, 0x99,
 282          0x97, 0xaa, 0x86, 0x66,
 283          0xad, 0xeb, 0x73, 0xbb,
 284          0x97, 0xaa, 0x86, 0x99,
 285          0xad, 0xeb, 0x73, 0xbb
 286       },
 287       {0x69, 0x99, 0xf2, 0x55, 0x34, 0x9e, 0xb6, 0xb9, 0x4e, 0xaf, 0x55, 0x69, 0x18, 0x61, 0x51, 0x22}
 288    },
 289    {
 290       {
 291          0x63, 0xd7, 0xd6, 0x00,
 292          0x57, 0x62, 0x5d, 0xdd,
 293          0x57, 0x62, 0x5d, 0xcc,
 294          0x57, 0x62, 0x5d, 0xbb,
 295          0x52, 0x28, 0x21, 0xaa,
 296          0x57, 0x62, 0x5d, 0xcc,
 297          0x57, 0x62, 0x5d, 0xcc,
 298          0x57, 0x62, 0x5d, 0x66,
 299          0x57, 0x62, 0x5d, 0x22,
 300          0x57, 0x62, 0x5d, 0xdd,
 301          0x63, 0xd7, 0xd6, 0xee,
 302          0x57, 0x62, 0x5d, 0x33,
 303          0x63, 0xd7, 0xd6, 0x55,
 304          0x52, 0x28, 0x21, 0x55,
 305          0x57, 0x62, 0x5d, 0x11,
 306          0x5d, 0x9c, 0x99, 0xee
 307       },
 308       {0xd0, 0xbc, 0xca, 0x6c, 0xd2, 0x3e, 0x55, 0xe1, 0xba, 0x66, 0x44, 0x51, 0xfc, 0xfd, 0xcf, 0xb4}
 309    },
 310    {
 311       {
 312          0x94, 0x6f, 0x60, 0x22,
 313          0x94, 0x6f, 0x60, 0x22,
 314          0xc5, 0xab, 0x76, 0x11,
 315          0xc5, 0xab, 0x76, 0xee,
 316          0x63, 0x34, 0x4a, 0xdd,
 317          0x63, 0x34, 0x4a, 0x33,
 318          0x94, 0x6f, 0x60, 0x77,
 319          0xf7, 0xe7, 0x8c, 0x00,
 320          0x94, 0x6f, 0x60, 0x33,
 321          0x63, 0x34, 0x4a, 0xaa,
 322          0x94, 0x6f, 0x60, 0x77,
 323          0x63, 0x34, 0x4a, 0xcc,
 324          0x94, 0x6f, 0x60, 0xaa,
 325          0xf7, 0xe7, 0x8c, 0x99,
 326          0x63, 0x34, 0x4a, 0x44,
 327          0xc5, 0xab, 0x76, 0xaa
 328       },
 329       {0x22, 0xe1, 0x3d, 0x07, 0xa3, 0xc7, 0x9a, 0xa4, 0x31, 0xf7, 0xa9, 0x61, 0xaf, 0x35, 0x77, 0x93}
 330    },
 331 };
 332
 333
 334 static const struct dxt_data
 335 dxt5_rgba_data[] = {
 336    {
 337       {
 338          0x6d, 0xc6, 0x96, 0x74,
 339          0x6d, 0xc6, 0x96, 0xf8,
 340          0x6d, 0xc6, 0x96, 0xb6,
 341          0x8c, 0xff, 0xb5, 0x53,
 342          0x6d, 0xc6, 0x96, 0xf8,
 343          0x6d, 0xc6, 0x96, 0x95,
 344          0x31, 0x55, 0x5a, 0x53,
 345          0x6d, 0xc6, 0x96, 0x95,
 346          0x31, 0x55, 0x5a, 0xb6,
 347          0x31, 0x55, 0x5a, 0x53,
 348          0x31, 0x55, 0x5a, 0x11,
 349          0x6d, 0xc6, 0x96, 0xd7,
 350          0x6d, 0xc6, 0x96, 0xb6,
 351          0x6d, 0xc6, 0x96, 0x11,
 352          0x31, 0x55, 0x5a, 0x32,
 353          0x31, 0x55, 0x5a, 0x95
 354       },
 355       {0xf8, 0x11, 0xc5, 0x0c, 0x9a, 0x73, 0xb4, 0x9c, 0xf6, 0x8f, 0xab, 0x32, 0x2a, 0x9a, 0x95, 0x5a}
 356    },
 357    {
 358       {
 359          0xad, 0xeb, 0x73, 0xa1,
 360          0x97, 0xaa, 0x86, 0x65,
 361          0x6b, 0x28, 0xad, 0xa1,
 362          0xad, 0xeb, 0x73, 0xa1,
 363          0x6b, 0x28, 0xad, 0x2a,
 364          0xad, 0xeb, 0x73, 0xfb,
 365          0x97, 0xaa, 0x86, 0x47,
 366          0x6b, 0x28, 0xad, 0x65,
 367          0x6b, 0x28, 0xad, 0x47,
 368          0xad, 0xeb, 0x73, 0x47,
 369          0x6b, 0x28, 0xad, 0xdd,
 370          0x6b, 0x28, 0xad, 0xa1,
 371          0x97, 0xaa, 0x86, 0x65,
 372          0xad, 0xeb, 0x73, 0xbf,
 373          0x97, 0xaa, 0x86, 0xa1,
 374          0xad, 0xeb, 0x73, 0xbf
 375       },
 376       {0xfb, 0x2a, 0x34, 0x19, 0xdc, 0xbf, 0xe8, 0x71, 0x4e, 0xaf, 0x55, 0x69, 0x18, 0x61, 0x51, 0x22}
 377    },
 378    {
 379       {
 380          0x63, 0xd7, 0xd6, 0x00,
 381          0x57, 0x62, 0x5d, 0xf5,
 382          0x57, 0x62, 0x5d, 0xd2,
 383          0x57, 0x62, 0x5d, 0xaf,
 384          0x52, 0x28, 0x21, 0xaf,
 385          0x57, 0x62, 0x5d, 0xd2,
 386          0x57, 0x62, 0x5d, 0xd2,
 387          0x57, 0x62, 0x5d, 0x69,
 388          0x57, 0x62, 0x5d, 0x23,
 389          0x57, 0x62, 0x5d, 0xd2,
 390          0x63, 0xd7, 0xd6, 0xf5,
 391          0x57, 0x62, 0x5d, 0x46,
 392          0x63, 0xd7, 0xd6, 0x46,
 393          0x52, 0x28, 0x21, 0x69,
 394          0x57, 0x62, 0x5d, 0x23,
 395          0x5d, 0x9c, 0x99, 0xf5
 396       },
 397       {0xf5, 0x00, 0x81, 0x36, 0xa9, 0x17, 0xec, 0x1e, 0xba, 0x66, 0x44, 0x51, 0xfc, 0xfd, 0xcf, 0xb4}
 398    },
 399    {
 400       {
 401          0x94, 0x6f, 0x60, 0x25,
 402          0x94, 0x6f, 0x60, 0x25,
 403          0xc5, 0xab, 0x76, 0x05,
 404          0xc5, 0xab, 0x76, 0xe8,
 405          0x63, 0x34, 0x4a, 0xe8,
 406          0x63, 0x34, 0x4a, 0x25,
 407          0x94, 0x6f, 0x60, 0x86,
 408          0xf7, 0xe7, 0x8c, 0x05,
 409          0x94, 0x6f, 0x60, 0x25,
 410          0x63, 0x34, 0x4a, 0xa7,
 411          0x94, 0x6f, 0x60, 0x66,
 412          0x63, 0x34, 0x4a, 0xc7,
 413          0x94, 0x6f, 0x60, 0xa7,
 414          0xf7, 0xe7, 0x8c, 0xa7,
 415          0x63, 0x34, 0x4a, 0x45,
 416          0xc5, 0xab, 0x76, 0xa7
 417       },
 418       {0xe8, 0x05, 0x7f, 0x80, 0x33, 0x5f, 0xb5, 0x79, 0x31, 0xf7, 0xa9, 0x61, 0xaf, 0x35, 0x77, 0x93}
 419    },
 420 };
 421
 422
 423 static INLINE void
 424 st_sample_dxt_pixel_block(enum pipe_format format,
 425                           const struct pipe_format_block *block,
 426                           uint8_t *raw,
 427                           float *rgba, unsigned rgba_stride,
 428                           unsigned w, unsigned h)
 429 {
 430    const struct dxt_data *data;
 431    unsigned n;
 432    unsigned i;
 433    unsigned x, y, ch;
 434
 435    switch(format) {
 436    case PIPE_FORMAT_DXT1_RGB:
 437       data = dxt1_rgb_data;
 438       n = sizeof(dxt1_rgb_data)/sizeof(dxt1_rgb_data[0]);
 439       break;
 440    case PIPE_FORMAT_DXT1_RGBA:
 441       data = dxt1_rgba_data;
 442       n = sizeof(dxt1_rgba_data)/sizeof(dxt1_rgba_data[0]);
 443       break;
 444    case PIPE_FORMAT_DXT3_RGBA:
 445       data = dxt3_rgba_data;
 446       n = sizeof(dxt3_rgba_data)/sizeof(dxt3_rgba_data[0]);
 447       break;
 448    case PIPE_FORMAT_DXT5_RGBA:
 449       data = dxt5_rgba_data;
 450       n = sizeof(dxt5_rgba_data)/sizeof(dxt5_rgba_data[0]);
 451       break;
 452    default:
 453       assert(0);
 454    }
 455
 456    i = st_random() % n;
 457
 458    for(y = 0; y < h; ++y)
 459       for(x = 0; x < w; ++x)
 460          for(ch = 0; ch < 4; ++ch)
 461             rgba[y*rgba_stride + x*4 + ch] = (float)(data[i].rgba[y*4*4 + x*4 + ch])/255.0f;
 462
 463    memcpy(raw, data[i].raw, block->size);
 464 }
 465
 466
 467 static INLINE void
 468 st_sample_generic_pixel_block(enum pipe_format format,
 469                               const struct pipe_format_block *block,
 470                               uint8_t *raw,
 471                               float *rgba, unsigned rgba_stride,
 472                               unsigned w, unsigned h)
 473 {
 474    unsigned i;
 475    unsigned x, y, ch;
 476
 477    for(i = 0; i < block->size; ++i)
 478       raw[i] = (uint8_t)st_random();
 479
 480
 481    pipe_tile_raw_to_rgba(format,
 482                          raw,
 483                          w, h,
 484                          rgba, rgba_stride);
 485
 486    if(format == PIPE_FORMAT_YCBCR || format == PIPE_FORMAT_YCBCR_REV) {
 487       for(y = 0; y < h; ++y) {
 488          for(x = 0; x < w; ++x) {
 489             for(ch = 0; ch < 4; ++ch) {
 490                unsigned offset = y*rgba_stride + x*4 + ch;
 491                rgba[offset] = CLAMP(rgba[offset], 0.0f, 1.0f);
 492             }
 493          }
 494       }
 495    }
 496 }
 497
 498
 499 /**
 500  * Randomly sample pixels.
 501  */
 502 void
 503 st_sample_pixel_block(enum pipe_format format,
 504                       const struct pipe_format_block *block,
 505                       void *raw,
 506                       float *rgba, unsigned rgba_stride,
 507                       unsigned w, unsigned h)
 508 {
 509    switch(format) {
 510    case PIPE_FORMAT_DXT1_RGB:
 511    case PIPE_FORMAT_DXT1_RGBA:
 512    case PIPE_FORMAT_DXT3_RGBA:
 513    case PIPE_FORMAT_DXT5_RGBA:
 514       st_sample_dxt_pixel_block(format, block, raw, rgba, rgba_stride, w, h);
 515       break;
 516
 517    default:
 518       st_sample_generic_pixel_block(format, block, raw, rgba, rgba_stride, w, h);
 519       break;
 520    }
 521 }
 522
 523
 524 void
 525 st_sample_surface(struct pipe_surface *surface, float *rgba)
 526 {
 527    const struct pipe_format_block *block = &surface->block;
 528    unsigned rgba_stride = surface->width*4;
 529    void *raw;
 530    unsigned x, y;
 531
 532    raw = pipe_surface_map(surface, PIPE_BUFFER_USAGE_CPU_READ);
 533    if(!raw)
 534       return;
 535
 536    for (y = 0; y < surface->nblocksy; ++y) {
 537       for(x = 0; x < surface->nblocksx; ++x) {
 538          st_sample_pixel_block(surface->format,
 539                                block,
 540                                (uint8_t*)raw + y*surface->stride + x*block->size,
 541                                rgba + y*block->height*rgba_stride + x*block->width*4,
 542                                rgba_stride,
 543                                MIN2(block->width, surface->width - x*block->width),
 544                                MIN2(block->height, surface->height - y*block->height));
 545        }
 546    }
 547
 548    pipe_surface_unmap(surface);
 549 }