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 "util/u_inlines.h"
  33 #include "util/u_format.h"
  34 #include "util/u_tile.h"
  35 #include "util/u_math.h"
  36 #include "util/u_memory.h"
  37
  38 #include "st_device.h"
  39 #include "st_sample.h"
  40
  41
  42 /**
  43  * Use our own pseudo random generator to ensure consistent runs among
  44  * multiple runs and platforms.
  45  *
  46  * @sa http://en.wikipedia.org/wiki/Linear_congruential_generator
  47  */
  48 static uint32_t st_random(void) {
  49    static uint64_t seed = UINT64_C(0xbb9a063afb0a739d);
  50
  51    seed = UINT64_C(134775813) * seed + UINT64_C(1);
  52
  53    return (uint32_t)(seed >> 32);
  54 }
  55
  56
  57 /**
  58  * We don't want to include the patent-encumbered DXT code here, so instead
  59  * we store several uncompressed/compressed data pairs for hardware testing
  60  * purposes.
  61  */
  62 struct dxt_data
  63 {
  64    uint8_t rgba[16*4];
  65    uint8_t raw[16];
  66 };
  67
  68
  69 static const struct dxt_data
  70 dxt1_rgb_data[] = {
  71    {
  72       {
  73          0x99, 0xb0, 0x8e, 0xff,
  74          0x5d, 0x62, 0x89, 0xff,
  75          0x99, 0xb0, 0x8e, 0xff,
  76          0x99, 0xb0, 0x8e, 0xff,
  77          0xd6, 0xff, 0x94, 0xff,
  78          0x5d, 0x62, 0x89, 0xff,
  79          0x99, 0xb0, 0x8e, 0xff,
  80          0xd6, 0xff, 0x94, 0xff,
  81          0x5d, 0x62, 0x89, 0xff,
  82          0x5d, 0x62, 0x89, 0xff,
  83          0x99, 0xb0, 0x8e, 0xff,
  84          0x21, 0x14, 0x84, 0xff,
  85          0x5d, 0x62, 0x89, 0xff,
  86          0x21, 0x14, 0x84, 0xff,
  87          0x21, 0x14, 0x84, 0xff,
  88          0x99, 0xb0, 0x8e, 0xff
  89       },
  90       {0xf2, 0xd7, 0xb0, 0x20, 0xae, 0x2c, 0x6f, 0x97}
  91    },
  92    {
  93       {
  94          0xb5, 0xcf, 0x9c, 0xff,
  95          0x83, 0x8c, 0x8b, 0xff,
  96          0x21, 0x08, 0x6b, 0xff,
  97          0x83, 0x8c, 0x8b, 0xff,
  98          0x52, 0x4a, 0x7b, 0xff,
  99          0x83, 0x8c, 0x8b, 0xff,
 100          0x83, 0x8c, 0x8b, 0xff,
 101          0xb5, 0xcf, 0x9c, 0xff,
 102          0x21, 0x08, 0x6b, 0xff,
 103          0xb5, 0xcf, 0x9c, 0xff,
 104          0x83, 0x8c, 0x8b, 0xff,
 105          0x52, 0x4a, 0x7b, 0xff,
 106          0xb5, 0xcf, 0x9c, 0xff,
 107          0x83, 0x8c, 0x8b, 0xff,
 108          0x52, 0x4a, 0x7b, 0xff,
 109          0x83, 0x8c, 0x8b, 0xff
 110       },
 111       {0x73, 0xb6, 0x4d, 0x20, 0x98, 0x2b, 0xe1, 0xb8}
 112    },
 113    {
 114       {
 115          0x00, 0x2c, 0xff, 0xff,
 116          0x94, 0x8d, 0x7b, 0xff,
 117          0x4a, 0x5c, 0xbd, 0xff,
 118          0x4a, 0x5c, 0xbd, 0xff,
 119          0x4a, 0x5c, 0xbd, 0xff,
 120          0x94, 0x8d, 0x7b, 0xff,
 121          0x94, 0x8d, 0x7b, 0xff,
 122          0x94, 0x8d, 0x7b, 0xff,
 123          0xde, 0xbe, 0x39, 0xff,
 124          0x94, 0x8d, 0x7b, 0xff,
 125          0xde, 0xbe, 0x39, 0xff,
 126          0xde, 0xbe, 0x39, 0xff,
 127          0xde, 0xbe, 0x39, 0xff,
 128          0xde, 0xbe, 0x39, 0xff,
 129          0xde, 0xbe, 0x39, 0xff,
 130          0x94, 0x8d, 0x7b, 0xff
 131       },
 132       {0xe7, 0xdd, 0x7f, 0x01, 0xf9, 0xab, 0x08, 0x80}
 133    },
 134    {
 135       {
 136          0x6b, 0x24, 0x21, 0xff,
 137          0x7b, 0x4f, 0x5d, 0xff,
 138          0x7b, 0x4f, 0x5d, 0xff,
 139          0x8b, 0x7a, 0x99, 0xff,
 140          0x7b, 0x4f, 0x5d, 0xff,
 141          0x7b, 0x4f, 0x5d, 0xff,
 142          0x6b, 0x24, 0x21, 0xff,
 143          0x8b, 0x7a, 0x99, 0xff,
 144          0x9c, 0xa6, 0xd6, 0xff,
 145          0x6b, 0x24, 0x21, 0xff,
 146          0x7b, 0x4f, 0x5d, 0xff,
 147          0x8b, 0x7a, 0x99, 0xff,
 148          0x6b, 0x24, 0x21, 0xff,
 149          0x8b, 0x7a, 0x99, 0xff,
 150          0x7b, 0x4f, 0x5d, 0xff,
 151          0x9c, 0xa6, 0xd6, 0xff
 152       },
 153       {0x3a, 0x9d, 0x24, 0x69, 0xbd, 0x9f, 0xb4, 0x39}
 154    }
 155 };
 156
 157
 158 static const struct dxt_data
 159 dxt1_rgba_data[] = {
 160    {
 161       {
 162          0x00, 0x00, 0x00, 0x00,
 163          0x4e, 0xaa, 0x90, 0xff,
 164          0x4e, 0xaa, 0x90, 0xff,
 165          0x00, 0x00, 0x00, 0x00,
 166          0x4e, 0xaa, 0x90, 0xff,
 167          0x29, 0xff, 0xff, 0xff,
 168          0x00, 0x00, 0x00, 0x00,
 169          0x4e, 0xaa, 0x90, 0xff,
 170          0x73, 0x55, 0x21, 0xff,
 171          0x00, 0x00, 0x00, 0x00,
 172          0x00, 0x00, 0x00, 0x00,
 173          0x4e, 0xaa, 0x90, 0xff,
 174          0x4e, 0xaa, 0x90, 0xff,
 175          0x00, 0x00, 0x00, 0x00,
 176          0x00, 0x00, 0x00, 0x00,
 177          0x4e, 0xaa, 0x90, 0xff
 178       },
 179       {0xff, 0x2f, 0xa4, 0x72, 0xeb, 0xb2, 0xbd, 0xbe}
 180    },
 181    {
 182       {
 183          0xb5, 0xe3, 0x63, 0xff,
 184          0x00, 0x00, 0x00, 0x00,
 185          0x6b, 0x24, 0x84, 0xff,
 186          0xb5, 0xe3, 0x63, 0xff,
 187          0x00, 0x00, 0x00, 0x00,
 188          0xb5, 0xe3, 0x63, 0xff,
 189          0x00, 0x00, 0x00, 0x00,
 190          0x00, 0x00, 0x00, 0x00,
 191          0x00, 0x00, 0x00, 0x00,
 192          0x00, 0x00, 0x00, 0x00,
 193          0x6b, 0x24, 0x84, 0xff,
 194          0x6b, 0x24, 0x84, 0xff,
 195          0x00, 0x00, 0x00, 0x00,
 196          0xb5, 0xe3, 0x63, 0xff,
 197          0x90, 0x83, 0x73, 0xff,
 198          0xb5, 0xe3, 0x63, 0xff
 199       },
 200       {0x30, 0x69, 0x0c, 0xb7, 0x4d, 0xf7, 0x0f, 0x67}
 201    },
 202    {
 203       {
 204          0x00, 0x00, 0x00, 0x00,
 205          0xc6, 0x86, 0x8c, 0xff,
 206          0xc6, 0x86, 0x8c, 0xff,
 207          0x21, 0x65, 0x42, 0xff,
 208          0x21, 0x65, 0x42, 0xff,
 209          0x21, 0x65, 0x42, 0xff,
 210          0x21, 0x65, 0x42, 0xff,
 211          0x00, 0x00, 0x00, 0x00,
 212          0x00, 0x00, 0x00, 0x00,
 213          0x21, 0x65, 0x42, 0xff,
 214          0xc6, 0x86, 0x8c, 0xff,
 215          0x00, 0x00, 0x00, 0x00,
 216          0x00, 0x00, 0x00, 0x00,
 217          0x00, 0x00, 0x00, 0x00,
 218          0x00, 0x00, 0x00, 0x00,
 219          0xc6, 0x86, 0x8c, 0xff
 220       },
 221       {0x28, 0x23, 0x31, 0xc4, 0x17, 0xc0, 0xd3, 0x7f}
 222    },
 223    {
 224       {
 225          0x00, 0x00, 0x00, 0x00,
 226          0x00, 0x00, 0x00, 0x00,
 227          0x00, 0x00, 0x00, 0x00,
 228          0xc6, 0xe3, 0x9c, 0xff,
 229          0x7b, 0x1c, 0x52, 0xff,
 230          0x00, 0x00, 0x00, 0x00,
 231          0x00, 0x00, 0x00, 0x00,
 232          0x00, 0x00, 0x00, 0x00,
 233          0x00, 0x00, 0x00, 0x00,
 234          0x7b, 0x1c, 0x52, 0xff,
 235          0x00, 0x00, 0x00, 0x00,
 236          0x7b, 0x1c, 0x52, 0xff,
 237          0xa0, 0x7f, 0x77, 0xff,
 238          0xc6, 0xe3, 0x9c, 0xff,
 239          0x00, 0x00, 0x00, 0x00,
 240          0xa0, 0x7f, 0x77, 0xff
 241       },
 242       {0xea, 0x78, 0x13, 0xc7, 0x7f, 0xfc, 0x33, 0xb6}
 243    },
 244 };
 245
 246
 247 static const struct dxt_data
 248 dxt3_rgba_data[] = {
 249    {
 250       {
 251          0x6d, 0xc6, 0x96, 0x77,
 252          0x6d, 0xc6, 0x96, 0xee,
 253          0x6d, 0xc6, 0x96, 0xaa,
 254          0x8c, 0xff, 0xb5, 0x44,
 255          0x6d, 0xc6, 0x96, 0xff,
 256          0x6d, 0xc6, 0x96, 0x88,
 257          0x31, 0x55, 0x5a, 0x66,
 258          0x6d, 0xc6, 0x96, 0x99,
 259          0x31, 0x55, 0x5a, 0xbb,
 260          0x31, 0x55, 0x5a, 0x55,
 261          0x31, 0x55, 0x5a, 0x11,
 262          0x6d, 0xc6, 0x96, 0xcc,
 263          0x6d, 0xc6, 0x96, 0xcc,
 264          0x6d, 0xc6, 0x96, 0x11,
 265          0x31, 0x55, 0x5a, 0x44,
 266          0x31, 0x55, 0x5a, 0x88
 267       },
 268       {0xe7, 0x4a, 0x8f, 0x96, 0x5b, 0xc1, 0x1c, 0x84, 0xf6, 0x8f, 0xab, 0x32, 0x2a, 0x9a, 0x95, 0x5a}
 269    },
 270    {
 271       {
 272          0xad, 0xeb, 0x73, 0x99,
 273          0x97, 0xaa, 0x86, 0x66,
 274          0x6b, 0x28, 0xad, 0x99,
 275          0xad, 0xeb, 0x73, 0x99,
 276          0x6b, 0x28, 0xad, 0x22,
 277          0xad, 0xeb, 0x73, 0xff,
 278          0x97, 0xaa, 0x86, 0x55,
 279          0x6b, 0x28, 0xad, 0x55,
 280          0x6b, 0x28, 0xad, 0x44,
 281          0xad, 0xeb, 0x73, 0x33,
 282          0x6b, 0x28, 0xad, 0xee,
 283          0x6b, 0x28, 0xad, 0x99,
 284          0x97, 0xaa, 0x86, 0x66,
 285          0xad, 0xeb, 0x73, 0xbb,
 286          0x97, 0xaa, 0x86, 0x99,
 287          0xad, 0xeb, 0x73, 0xbb
 288       },
 289       {0x69, 0x99, 0xf2, 0x55, 0x34, 0x9e, 0xb6, 0xb9, 0x4e, 0xaf, 0x55, 0x69, 0x18, 0x61, 0x51, 0x22}
 290    },
 291    {
 292       {
 293          0x63, 0xd7, 0xd6, 0x00,
 294          0x57, 0x62, 0x5d, 0xdd,
 295          0x57, 0x62, 0x5d, 0xcc,
 296          0x57, 0x62, 0x5d, 0xbb,
 297          0x52, 0x28, 0x21, 0xaa,
 298          0x57, 0x62, 0x5d, 0xcc,
 299          0x57, 0x62, 0x5d, 0xcc,
 300          0x57, 0x62, 0x5d, 0x66,
 301          0x57, 0x62, 0x5d, 0x22,
 302          0x57, 0x62, 0x5d, 0xdd,
 303          0x63, 0xd7, 0xd6, 0xee,
 304          0x57, 0x62, 0x5d, 0x33,
 305          0x63, 0xd7, 0xd6, 0x55,
 306          0x52, 0x28, 0x21, 0x55,
 307          0x57, 0x62, 0x5d, 0x11,
 308          0x5d, 0x9c, 0x99, 0xee
 309       },
 310       {0xd0, 0xbc, 0xca, 0x6c, 0xd2, 0x3e, 0x55, 0xe1, 0xba, 0x66, 0x44, 0x51, 0xfc, 0xfd, 0xcf, 0xb4}
 311    },
 312    {
 313       {
 314          0x94, 0x6f, 0x60, 0x22,
 315          0x94, 0x6f, 0x60, 0x22,
 316          0xc5, 0xab, 0x76, 0x11,
 317          0xc5, 0xab, 0x76, 0xee,
 318          0x63, 0x34, 0x4a, 0xdd,
 319          0x63, 0x34, 0x4a, 0x33,
 320          0x94, 0x6f, 0x60, 0x77,
 321          0xf7, 0xe7, 0x8c, 0x00,
 322          0x94, 0x6f, 0x60, 0x33,
 323          0x63, 0x34, 0x4a, 0xaa,
 324          0x94, 0x6f, 0x60, 0x77,
 325          0x63, 0x34, 0x4a, 0xcc,
 326          0x94, 0x6f, 0x60, 0xaa,
 327          0xf7, 0xe7, 0x8c, 0x99,
 328          0x63, 0x34, 0x4a, 0x44,
 329          0xc5, 0xab, 0x76, 0xaa
 330       },
 331       {0x22, 0xe1, 0x3d, 0x07, 0xa3, 0xc7, 0x9a, 0xa4, 0x31, 0xf7, 0xa9, 0x61, 0xaf, 0x35, 0x77, 0x93}
 332    },
 333 };
 334
 335
 336 static const struct dxt_data
 337 dxt5_rgba_data[] = {
 338    {
 339       {
 340          0x6d, 0xc6, 0x96, 0x74,
 341          0x6d, 0xc6, 0x96, 0xf8,
 342          0x6d, 0xc6, 0x96, 0xb6,
 343          0x8c, 0xff, 0xb5, 0x53,
 344          0x6d, 0xc6, 0x96, 0xf8,
 345          0x6d, 0xc6, 0x96, 0x95,
 346          0x31, 0x55, 0x5a, 0x53,
 347          0x6d, 0xc6, 0x96, 0x95,
 348          0x31, 0x55, 0x5a, 0xb6,
 349          0x31, 0x55, 0x5a, 0x53,
 350          0x31, 0x55, 0x5a, 0x11,
 351          0x6d, 0xc6, 0x96, 0xd7,
 352          0x6d, 0xc6, 0x96, 0xb6,
 353          0x6d, 0xc6, 0x96, 0x11,
 354          0x31, 0x55, 0x5a, 0x32,
 355          0x31, 0x55, 0x5a, 0x95
 356       },
 357       {0xf8, 0x11, 0xc5, 0x0c, 0x9a, 0x73, 0xb4, 0x9c, 0xf6, 0x8f, 0xab, 0x32, 0x2a, 0x9a, 0x95, 0x5a}
 358    },
 359    {
 360       {
 361          0xad, 0xeb, 0x73, 0xa1,
 362          0x97, 0xaa, 0x86, 0x65,
 363          0x6b, 0x28, 0xad, 0xa1,
 364          0xad, 0xeb, 0x73, 0xa1,
 365          0x6b, 0x28, 0xad, 0x2a,
 366          0xad, 0xeb, 0x73, 0xfb,
 367          0x97, 0xaa, 0x86, 0x47,
 368          0x6b, 0x28, 0xad, 0x65,
 369          0x6b, 0x28, 0xad, 0x47,
 370          0xad, 0xeb, 0x73, 0x47,
 371          0x6b, 0x28, 0xad, 0xdd,
 372          0x6b, 0x28, 0xad, 0xa1,
 373          0x97, 0xaa, 0x86, 0x65,
 374          0xad, 0xeb, 0x73, 0xbf,
 375          0x97, 0xaa, 0x86, 0xa1,
 376          0xad, 0xeb, 0x73, 0xbf
 377       },
 378       {0xfb, 0x2a, 0x34, 0x19, 0xdc, 0xbf, 0xe8, 0x71, 0x4e, 0xaf, 0x55, 0x69, 0x18, 0x61, 0x51, 0x22}
 379    },
 380    {
 381       {
 382          0x63, 0xd7, 0xd6, 0x00,
 383          0x57, 0x62, 0x5d, 0xf5,
 384          0x57, 0x62, 0x5d, 0xd2,
 385          0x57, 0x62, 0x5d, 0xaf,
 386          0x52, 0x28, 0x21, 0xaf,
 387          0x57, 0x62, 0x5d, 0xd2,
 388          0x57, 0x62, 0x5d, 0xd2,
 389          0x57, 0x62, 0x5d, 0x69,
 390          0x57, 0x62, 0x5d, 0x23,
 391          0x57, 0x62, 0x5d, 0xd2,
 392          0x63, 0xd7, 0xd6, 0xf5,
 393          0x57, 0x62, 0x5d, 0x46,
 394          0x63, 0xd7, 0xd6, 0x46,
 395          0x52, 0x28, 0x21, 0x69,
 396          0x57, 0x62, 0x5d, 0x23,
 397          0x5d, 0x9c, 0x99, 0xf5
 398       },
 399       {0xf5, 0x00, 0x81, 0x36, 0xa9, 0x17, 0xec, 0x1e, 0xba, 0x66, 0x44, 0x51, 0xfc, 0xfd, 0xcf, 0xb4}
 400    },
 401    {
 402       {
 403          0x94, 0x6f, 0x60, 0x25,
 404          0x94, 0x6f, 0x60, 0x25,
 405          0xc5, 0xab, 0x76, 0x05,
 406          0xc5, 0xab, 0x76, 0xe8,
 407          0x63, 0x34, 0x4a, 0xe8,
 408          0x63, 0x34, 0x4a, 0x25,
 409          0x94, 0x6f, 0x60, 0x86,
 410          0xf7, 0xe7, 0x8c, 0x05,
 411          0x94, 0x6f, 0x60, 0x25,
 412          0x63, 0x34, 0x4a, 0xa7,
 413          0x94, 0x6f, 0x60, 0x66,
 414          0x63, 0x34, 0x4a, 0xc7,
 415          0x94, 0x6f, 0x60, 0xa7,
 416          0xf7, 0xe7, 0x8c, 0xa7,
 417          0x63, 0x34, 0x4a, 0x45,
 418          0xc5, 0xab, 0x76, 0xa7
 419       },
 420       {0xe8, 0x05, 0x7f, 0x80, 0x33, 0x5f, 0xb5, 0x79, 0x31, 0xf7, 0xa9, 0x61, 0xaf, 0x35, 0x77, 0x93}
 421    },
 422 };
 423
 424
 425 static INLINE void
 426 st_sample_dxt_pixel_block(enum pipe_format format,
 427                           uint8_t *raw,
 428                           float *rgba, unsigned rgba_stride,
 429                           unsigned w, unsigned h)
 430 {
 431    const struct dxt_data *data;
 432    unsigned n;
 433    unsigned i;
 434    unsigned x, y, ch;
 435
 436    switch(format) {
 437    case PIPE_FORMAT_DXT1_RGB:
 438       data = dxt1_rgb_data;
 439       n = sizeof(dxt1_rgb_data)/sizeof(dxt1_rgb_data[0]);
 440       break;
 441    case PIPE_FORMAT_DXT1_RGBA:
 442       data = dxt1_rgba_data;
 443       n = sizeof(dxt1_rgba_data)/sizeof(dxt1_rgba_data[0]);
 444       break;
 445    case PIPE_FORMAT_DXT3_RGBA:
 446       data = dxt3_rgba_data;
 447       n = sizeof(dxt3_rgba_data)/sizeof(dxt3_rgba_data[0]);
 448       break;
 449    case PIPE_FORMAT_DXT5_RGBA:
 450       data = dxt5_rgba_data;
 451       n = sizeof(dxt5_rgba_data)/sizeof(dxt5_rgba_data[0]);
 452       break;
 453    default:
 454       assert(0);
 455       return;
 456    }
 457
 458    i = st_random() % n;
 459
 460    for(y = 0; y < h; ++y)
 461       for(x = 0; x < w; ++x)
 462          for(ch = 0; ch < 4; ++ch)
 463             rgba[y*rgba_stride + x*4 + ch] = (float)(data[i].rgba[y*4*4 + x*4 + ch])/255.0f;
 464
 465    memcpy(raw, data[i].raw, util_format_get_blocksize(format));
 466 }
 467
 468
 469 static INLINE void
 470 st_sample_generic_pixel_block(enum pipe_format format,
 471                               uint8_t *raw,
 472                               float *rgba, unsigned rgba_stride,
 473                               unsigned w, unsigned h,
 474                               boolean norm)
 475 {
 476    unsigned i;
 477    unsigned x, y, ch;
 478    int blocksize = util_format_get_blocksize(format);
 479
 480    if (norm) {
 481       for (y = 0; y < h; ++y) {
 482          for (x = 0; x < w; ++x) {
 483             for (ch = 0; ch < 4; ++ch) {
 484                unsigned offset = y*rgba_stride + x*4 + ch;
 485                rgba[offset] = (st_random() & 0xff) / (double)0xff;
 486             }
 487          }
 488       }
 489
 490       util_format_write_4f(format,
 491                            rgba, rgba_stride * sizeof(float),
 492                            raw, util_format_get_stride(format, w),
 493                            0, 0, w, h);
 494
 495    } else {
 496       for (i = 0; i < blocksize; ++i)
 497          raw[i] = (uint8_t)st_random();
 498    }
 499
 500    util_format_read_4f(format,
 501                        rgba, rgba_stride * sizeof(float),
 502                        raw, util_format_get_stride(format, w),
 503                        0, 0, w, h);
 504
 505    if (format == PIPE_FORMAT_UYVY || format == PIPE_FORMAT_YUYV) {
 506       for (y = 0; y < h; ++y) {
 507          for (x = 0; x < w; ++x) {
 508             for (ch = 0; ch < 4; ++ch) {
 509                unsigned offset = y*rgba_stride + x*4 + ch;
 510                rgba[offset] = CLAMP(rgba[offset], 0.0f, 1.0f);
 511             }
 512          }
 513       }
 514    }
 515 }
 516
 517
 518 /**
 519  * Randomly sample pixels.
 520  */
 521 void
 522 st_sample_pixel_block(enum pipe_format format,
 523                       void *raw,
 524                       float *rgba, unsigned rgba_stride,
 525                       unsigned w, unsigned h,
 526                       boolean norm)
 527 {
 528    switch(format) {
 529    case PIPE_FORMAT_DXT1_RGB:
 530    case PIPE_FORMAT_DXT1_RGBA:
 531    case PIPE_FORMAT_DXT3_RGBA:
 532    case PIPE_FORMAT_DXT5_RGBA:
 533       st_sample_dxt_pixel_block(format, raw, rgba, rgba_stride, w, h);
 534       break;
 535
 536    default:
 537       st_sample_generic_pixel_block(format, raw, rgba, rgba_stride, w, h, norm);
 538       break;
 539    }
 540 }
 541
 542
 543 void
 544 st_sample_surface(struct pipe_context *pipe,
 545                   struct st_surface *surface,
 546                   float *rgba,
 547                   boolean norm)
 548 {
 549    struct pipe_texture *texture = surface->texture;
 550    unsigned width = u_minify(texture->width0, surface->level);
 551    unsigned height = u_minify(texture->height0, surface->level);
 552    uint rgba_stride = width * 4;
 553    struct pipe_transfer *transfer;
 554    void *raw;
 555
 556    transfer = pipe->get_tex_transfer(pipe,
 557                                      surface->texture,
 558                                      surface->face,
 559                                      surface->level,
 560                                      surface->zslice,
 561                                      PIPE_TRANSFER_WRITE,
 562                                      0, 0,
 563                                      width,
 564                                      height);
 565    if (!transfer)
 566       return;
 567
 568    raw = pipe->transfer_map(pipe, transfer);
 569    if (raw) {
 570       enum pipe_format format = texture->format;
 571       uint x, y;
 572       int nblocksx = util_format_get_nblocksx(format, width);
 573       int nblocksy = util_format_get_nblocksy(format, height);
 574       int blockwidth = util_format_get_blockwidth(format);
 575       int blockheight = util_format_get_blockheight(format);
 576       int blocksize = util_format_get_blocksize(format);
 577
 578
 579       for (y = 0; y < nblocksy; ++y) {
 580          for (x = 0; x < nblocksx; ++x) {
 581             st_sample_pixel_block(format,
 582                                   (uint8_t *) raw + y * transfer->stride + x * blocksize,
 583                                   rgba + y * blockheight * rgba_stride + x * blockwidth * 4,
 584                                   rgba_stride,
 585                                   MIN2(blockwidth, width - x*blockwidth),
 586                                   MIN2(blockheight, height - y*blockheight),
 587                                   norm);
 588          }
 589       }
 590
 591       pipe->transfer_unmap(pipe, transfer);
 592    }
 593
 594    pipe->tex_transfer_destroy(pipe, transfer);
 595 }