src/gallium/drivers/llvmpipe/lp_screen.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2008 VMware, Inc.
   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 VMWARE 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 "util/u_memory.h"
  30 #include "util/u_math.h"
  31 #include "util/u_cpu_detect.h"
  32 #include "util/u_format.h"
  33 #include "util/u_string.h"
  34 #include "util/u_format_s3tc.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "draw/draw_context.h"
  38 #include "gallivm/lp_bld_type.h"
  39
  40 #include "os/os_time.h"
  41 #include "lp_texture.h"
  42 #include "lp_fence.h"
  43 #include "lp_jit.h"
  44 #include "lp_screen.h"
  45 #include "lp_context.h"
  46 #include "lp_debug.h"
  47 #include "lp_public.h"
  48 #include "lp_limits.h"
  49 #include "lp_rast.h"
  50
  51 #include "state_tracker/sw_winsys.h"
  52
  53 #ifdef DEBUG
  54 int LP_DEBUG = 0;
  55
  56 static const struct debug_named_value lp_debug_flags[] = {
  57    { "pipe",   DEBUG_PIPE, NULL },
  58    { "tgsi",   DEBUG_TGSI, NULL },
  59    { "tex",    DEBUG_TEX, NULL },
  60    { "setup",  DEBUG_SETUP, NULL },
  61    { "rast",   DEBUG_RAST, NULL },
  62    { "query",  DEBUG_QUERY, NULL },
  63    { "screen", DEBUG_SCREEN, NULL },
  64    { "counters", DEBUG_COUNTERS, NULL },
  65    { "scene", DEBUG_SCENE, NULL },
  66    { "fence", DEBUG_FENCE, NULL },
  67    { "mem", DEBUG_MEM, NULL },
  68    { "fs", DEBUG_FS, NULL },
  69    DEBUG_NAMED_VALUE_END
  70 };
  71 #endif
  72
  73 int LP_PERF = 0;
  74 static const struct debug_named_value lp_perf_flags[] = {
  75    { "texmem",         PERF_TEX_MEM, NULL },
  76    { "no_mipmap",      PERF_NO_MIPMAPS, NULL },
  77    { "no_linear",      PERF_NO_LINEAR, NULL },
  78    { "no_mip_linear",  PERF_NO_MIP_LINEAR, NULL },
  79    { "no_tex",         PERF_NO_TEX, NULL },
  80    { "no_blend",       PERF_NO_BLEND, NULL },
  81    { "no_depth",       PERF_NO_DEPTH, NULL },
  82    { "no_alphatest",   PERF_NO_ALPHATEST, NULL },
  83    DEBUG_NAMED_VALUE_END
  84 };
  85
  86
  87 static const char *
  88 llvmpipe_get_vendor(struct pipe_screen *screen)
  89 {
  90    return "VMware, Inc.";
  91 }
  92
  93
  94 static const char *
  95 llvmpipe_get_name(struct pipe_screen *screen)
  96 {
  97    static char buf[100];
  98    util_snprintf(buf, sizeof(buf), "llvmpipe (LLVM %u.%u, %u bits)",
  99                  HAVE_LLVM >> 8, HAVE_LLVM & 0xff,
 100                  lp_native_vector_width );
 101    return buf;
 102 }
 103
 104
 105 static int
 106 llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
 107 {
 108    switch (param) {
 109    case PIPE_CAP_NPOT_TEXTURES:
 110    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
 111       return 1;
 112    case PIPE_CAP_TWO_SIDED_STENCIL:
 113       return 1;
 114    case PIPE_CAP_SM3:
 115       return 1;
 116    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
 117       return 1;
 118    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 119       return PIPE_MAX_SO_BUFFERS;
 120    case PIPE_CAP_ANISOTROPIC_FILTER:
 121       return 0;
 122    case PIPE_CAP_POINT_SPRITE:
 123       return 1;
 124    case PIPE_CAP_MAX_RENDER_TARGETS:
 125       return PIPE_MAX_COLOR_BUFS;
 126    case PIPE_CAP_OCCLUSION_QUERY:
 127       return 1;
 128    case PIPE_CAP_QUERY_TIME_ELAPSED:
 129       return 0;
 130    case PIPE_CAP_QUERY_TIMESTAMP:
 131       return 1;
 132    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 133       return 0;
 134    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
 135       return 1;
 136    case PIPE_CAP_TEXTURE_SHADOW_MAP:
 137       return 1;
 138    case PIPE_CAP_TEXTURE_SWIZZLE:
 139       return 1;
 140    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
 141       return 0;
 142    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
 143       return LP_MAX_TEXTURE_2D_LEVELS;
 144    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 145       return LP_MAX_TEXTURE_3D_LEVELS;
 146    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 147       return LP_MAX_TEXTURE_CUBE_LEVELS;
 148    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 149       return LP_MAX_TEXTURE_ARRAY_LAYERS;
 150    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
 151       return 1;
 152    case PIPE_CAP_INDEP_BLEND_ENABLE:
 153       return 1;
 154    case PIPE_CAP_INDEP_BLEND_FUNC:
 155       return 1;
 156    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 157    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 158    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 159       return 1;
 160    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 161       return 0;
 162    case PIPE_CAP_PRIMITIVE_RESTART:
 163       return 1;
 164    case PIPE_CAP_DEPTH_CLIP_DISABLE:
 165       return 1;
 166    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 167       return 0;
 168    case PIPE_CAP_TGSI_INSTANCEID:
 169    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 170       return 1;
 171    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 172       return 0;
 173    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 174       return 1;
 175    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 176    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 177       return 1;
 178    /* this is a lie could support arbitrary large offsets */
 179    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 180    case PIPE_CAP_MIN_TEXEL_OFFSET:
 181       return -8;
 182    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 183    case PIPE_CAP_MAX_TEXEL_OFFSET:
 184       return 7;
 185    case PIPE_CAP_CONDITIONAL_RENDER:
 186       return 1;
 187    case PIPE_CAP_TEXTURE_BARRIER:
 188       return 0;
 189    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 190    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 191       return 16*4;
 192    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 193    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 194       return 1024;
 195    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 196       return 1;
 197    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 198       return 0;
 199    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 200    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 201       return 1;
 202    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 203       return 330;
 204    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 205       return 0;
 206    case PIPE_CAP_COMPUTE:
 207       return 0;
 208    case PIPE_CAP_USER_VERTEX_BUFFERS:
 209    case PIPE_CAP_USER_INDEX_BUFFERS:
 210       return 1;
 211    case PIPE_CAP_USER_CONSTANT_BUFFERS:
 212       return 0;
 213    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 214    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 215    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 216    case PIPE_CAP_TGSI_TEXCOORD:
 217       return 0;
 218
 219    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 220       return 16;
 221    case PIPE_CAP_START_INSTANCE:
 222    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 223    case PIPE_CAP_CUBE_MAP_ARRAY:
 224       return 0;
 225    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 226       return 64;
 227    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 228       return 1;
 229    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 230       return 65536;
 231    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 232       return 1;
 233    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 234       return 0;
 235    case PIPE_CAP_MAX_VIEWPORTS:
 236       return PIPE_MAX_VIEWPORTS;
 237    case PIPE_CAP_ENDIANNESS:
 238       return PIPE_ENDIAN_NATIVE;
 239    case PIPE_CAP_TGSI_VS_LAYER:
 240    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 241    case PIPE_CAP_TEXTURE_GATHER_SM5:
 242    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 243    case PIPE_CAP_TEXTURE_QUERY_LOD:
 244    case PIPE_CAP_SAMPLE_SHADING:
 245       return 0;
 246    case PIPE_CAP_FAKE_SW_MSAA:
 247         return 1;
 248    }
 249    /* should only get here on unhandled cases */
 250    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 251    return 0;
 252 }
 253
 254 static int
 255 llvmpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 256 {
 257    switch(shader)
 258    {
 259    case PIPE_SHADER_FRAGMENT:
 260       switch (param) {
 261       default:
 262          return gallivm_get_shader_param(param);
 263       }
 264    case PIPE_SHADER_VERTEX:
 265    case PIPE_SHADER_GEOMETRY:
 266       switch (param) {
 267       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 268          /* At this time, the draw module and llvmpipe driver only
 269           * support vertex shader texture lookups when LLVM is enabled in
 270           * the draw module.
 271           */
 272          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 273             return PIPE_MAX_SAMPLERS;
 274          else
 275             return 0;
 276       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 277          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 278             return PIPE_MAX_SHADER_SAMPLER_VIEWS;
 279          else
 280             return 0;
 281       default:
 282          return draw_get_shader_param(shader, param);
 283       }
 284    default:
 285       return 0;
 286    }
 287 }
 288
 289 static float
 290 llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 291 {
 292    switch (param) {
 293    case PIPE_CAPF_MAX_LINE_WIDTH:
 294       /* fall-through */
 295    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 296       return 255.0; /* arbitrary */
 297    case PIPE_CAPF_MAX_POINT_WIDTH:
 298       /* fall-through */
 299    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 300       return 255.0; /* arbitrary */
 301    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 302       return 16.0; /* not actually signficant at this time */
 303    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 304       return 16.0; /* arbitrary */
 305    case PIPE_CAPF_GUARD_BAND_LEFT:
 306    case PIPE_CAPF_GUARD_BAND_TOP:
 307    case PIPE_CAPF_GUARD_BAND_RIGHT:
 308    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 309       return 0.0;
 310    }
 311    /* should only get here on unhandled cases */
 312    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 313    return 0.0;
 314 }
 315
 316
 317 /**
 318  * Query format support for creating a texture, drawing surface, etc.
 319  * \param format  the format to test
 320  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 321  */
 322 static boolean
 323 llvmpipe_is_format_supported( struct pipe_screen *_screen,
 324                               enum pipe_format format,
 325                               enum pipe_texture_target target,
 326                               unsigned sample_count,
 327                               unsigned bind)
 328 {
 329    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 330    struct sw_winsys *winsys = screen->winsys;
 331    const struct util_format_description *format_desc;
 332
 333    format_desc = util_format_description(format);
 334    if (!format_desc)
 335       return FALSE;
 336
 337    assert(target == PIPE_BUFFER ||
 338           target == PIPE_TEXTURE_1D ||
 339           target == PIPE_TEXTURE_1D_ARRAY ||
 340           target == PIPE_TEXTURE_2D ||
 341           target == PIPE_TEXTURE_2D_ARRAY ||
 342           target == PIPE_TEXTURE_RECT ||
 343           target == PIPE_TEXTURE_3D ||
 344           target == PIPE_TEXTURE_CUBE);
 345
 346    if (sample_count > 1)
 347       return FALSE;
 348
 349    if (bind & PIPE_BIND_RENDER_TARGET) {
 350       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 351          /* this is a lie actually other formats COULD exist where we would fail */
 352          if (format_desc->nr_channels < 3)
 353             return FALSE;
 354       }
 355       else if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_RGB)
 356          return FALSE;
 357
 358       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN &&
 359           format != PIPE_FORMAT_R11G11B10_FLOAT)
 360          return FALSE;
 361
 362       assert(format_desc->block.width == 1);
 363       assert(format_desc->block.height == 1);
 364
 365       if (format_desc->is_mixed)
 366          return FALSE;
 367
 368       if (!format_desc->is_array && !format_desc->is_bitmask &&
 369           format != PIPE_FORMAT_R11G11B10_FLOAT)
 370          return FALSE;
 371
 372       /*
 373        * XXX refuse formats known to crash in generate_unswizzled_blend().
 374        * These include all 3-channel 24bit RGB8 variants, plus 48bit
 375        * (except those using floats) 3-channel RGB16 variants (the latter
 376        * seems to be more of a llvm bug though).
 377        * The mesa state tracker only seems to use these for SINT/UINT formats.
 378        */
 379       if (format_desc->is_array && format_desc->nr_channels == 3) {
 380          if (format_desc->block.bits == 24 || (format_desc->block.bits == 48 &&
 381                !util_format_is_float(format))) {
 382             return FALSE;
 383          }
 384       }
 385    }
 386
 387    if (bind & PIPE_BIND_DISPLAY_TARGET) {
 388       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
 389          return FALSE;
 390    }
 391
 392    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 393       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 394          return FALSE;
 395
 396       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 397          return FALSE;
 398
 399       /* TODO: Support stencil-only formats */
 400       if (format_desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
 401          return FALSE;
 402       }
 403    }
 404
 405    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 406       return util_format_s3tc_enabled;
 407    }
 408
 409    /*
 410     * Everything can be supported by u_format
 411     * (those without fetch_rgba_float might be not but shouldn't hit that)
 412     */
 413
 414    return TRUE;
 415 }
 416
 417
 418
 419
 420 static void
 421 llvmpipe_flush_frontbuffer(struct pipe_screen *_screen,
 422                            struct pipe_resource *resource,
 423                            unsigned level, unsigned layer,
 424                            void *context_private,
 425                            struct pipe_box *sub_box)
 426 {
 427    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 428    struct sw_winsys *winsys = screen->winsys;
 429    struct llvmpipe_resource *texture = llvmpipe_resource(resource);
 430
 431    assert(texture->dt);
 432    if (texture->dt)
 433       winsys->displaytarget_display(winsys, texture->dt, context_private, sub_box);
 434 }
 435
 436 static void
 437 llvmpipe_destroy_screen( struct pipe_screen *_screen )
 438 {
 439    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 440    struct sw_winsys *winsys = screen->winsys;
 441
 442    if (screen->rast)
 443       lp_rast_destroy(screen->rast);
 444
 445    lp_jit_screen_cleanup(screen);
 446
 447    if(winsys->destroy)
 448       winsys->destroy(winsys);
 449
 450    pipe_mutex_destroy(screen->rast_mutex);
 451
 452    FREE(screen);
 453 }
 454
 455
 456
 457
 458 /**
 459  * Fence reference counting.
 460  */
 461 static void
 462 llvmpipe_fence_reference(struct pipe_screen *screen,
 463                          struct pipe_fence_handle **ptr,
 464                          struct pipe_fence_handle *fence)
 465 {
 466    struct lp_fence **old = (struct lp_fence **) ptr;
 467    struct lp_fence *f = (struct lp_fence *) fence;
 468
 469    lp_fence_reference(old, f);
 470 }
 471
 472
 473 /**
 474  * Has the fence been executed/finished?
 475  */
 476 static boolean
 477 llvmpipe_fence_signalled(struct pipe_screen *screen,
 478                          struct pipe_fence_handle *fence)
 479 {
 480    struct lp_fence *f = (struct lp_fence *) fence;
 481    return lp_fence_signalled(f);
 482 }
 483
 484
 485 /**
 486  * Wait for the fence to finish.
 487  */
 488 static boolean
 489 llvmpipe_fence_finish(struct pipe_screen *screen,
 490                       struct pipe_fence_handle *fence_handle,
 491                       uint64_t timeout)
 492 {
 493    struct lp_fence *f = (struct lp_fence *) fence_handle;
 494
 495    lp_fence_wait(f);
 496    return TRUE;
 497 }
 498
 499 static uint64_t
 500 llvmpipe_get_timestamp(struct pipe_screen *_screen)
 501 {
 502    return os_time_get_nano();
 503 }
 504
 505 /**
 506  * Create a new pipe_screen object
 507  * Note: we're not presently subclassing pipe_screen (no llvmpipe_screen).
 508  */
 509 struct pipe_screen *
 510 llvmpipe_create_screen(struct sw_winsys *winsys)
 511 {
 512    struct llvmpipe_screen *screen;
 513
 514    util_cpu_detect();
 515
 516 #if defined(PIPE_ARCH_X86) && HAVE_LLVM < 0x0302
 517    /* require SSE2 due to LLVM PR6960. */
 518    if (!util_cpu_caps.has_sse2)
 519        return NULL;
 520 #endif
 521
 522 #ifdef DEBUG
 523    LP_DEBUG = debug_get_flags_option("LP_DEBUG", lp_debug_flags, 0 );
 524 #endif
 525
 526    LP_PERF = debug_get_flags_option("LP_PERF", lp_perf_flags, 0 );
 527
 528    screen = CALLOC_STRUCT(llvmpipe_screen);
 529    if (!screen)
 530       return NULL;
 531
 532    screen->winsys = winsys;
 533
 534    screen->base.destroy = llvmpipe_destroy_screen;
 535
 536    screen->base.get_name = llvmpipe_get_name;
 537    screen->base.get_vendor = llvmpipe_get_vendor;
 538    screen->base.get_param = llvmpipe_get_param;
 539    screen->base.get_shader_param = llvmpipe_get_shader_param;
 540    screen->base.get_paramf = llvmpipe_get_paramf;
 541    screen->base.is_format_supported = llvmpipe_is_format_supported;
 542
 543    screen->base.context_create = llvmpipe_create_context;
 544    screen->base.flush_frontbuffer = llvmpipe_flush_frontbuffer;
 545    screen->base.fence_reference = llvmpipe_fence_reference;
 546    screen->base.fence_signalled = llvmpipe_fence_signalled;
 547    screen->base.fence_finish = llvmpipe_fence_finish;
 548
 549    screen->base.get_timestamp = llvmpipe_get_timestamp;
 550
 551    llvmpipe_init_screen_resource_funcs(&screen->base);
 552
 553    lp_jit_screen_init(screen);
 554
 555    screen->num_threads = util_cpu_caps.nr_cpus > 1 ? util_cpu_caps.nr_cpus : 0;
 556 #ifdef PIPE_SUBSYSTEM_EMBEDDED
 557    screen->num_threads = 0;
 558 #endif
 559    screen->num_threads = debug_get_num_option("LP_NUM_THREADS", screen->num_threads);
 560    screen->num_threads = MIN2(screen->num_threads, LP_MAX_THREADS);
 561
 562    screen->rast = lp_rast_create(screen->num_threads);
 563    if (!screen->rast) {
 564       lp_jit_screen_cleanup(screen);
 565       FREE(screen);
 566       return NULL;
 567    }
 568    pipe_mutex_init(screen->rast_mutex);
 569
 570    util_format_s3tc_init();
 571
 572    return &screen->base;
 573 }