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_misc.h"
  41 #include "os/os_time.h"
  42 #include "lp_texture.h"
  43 #include "lp_fence.h"
  44 #include "lp_jit.h"
  45 #include "lp_screen.h"
  46 #include "lp_context.h"
  47 #include "lp_debug.h"
  48 #include "lp_public.h"
  49 #include "lp_limits.h"
  50 #include "lp_rast.h"
  51
  52 #include "state_tracker/sw_winsys.h"
  53
  54 #ifdef DEBUG
  55 int LP_DEBUG = 0;
  56
  57 static const struct debug_named_value lp_debug_flags[] = {
  58    { "pipe",   DEBUG_PIPE, NULL },
  59    { "tgsi",   DEBUG_TGSI, NULL },
  60    { "tex",    DEBUG_TEX, NULL },
  61    { "setup",  DEBUG_SETUP, NULL },
  62    { "rast",   DEBUG_RAST, NULL },
  63    { "query",  DEBUG_QUERY, NULL },
  64    { "screen", DEBUG_SCREEN, NULL },
  65    { "counters", DEBUG_COUNTERS, NULL },
  66    { "scene", DEBUG_SCENE, NULL },
  67    { "fence", DEBUG_FENCE, NULL },
  68    { "mem", DEBUG_MEM, NULL },
  69    { "fs", DEBUG_FS, NULL },
  70    DEBUG_NAMED_VALUE_END
  71 };
  72 #endif
  73
  74 int LP_PERF = 0;
  75 static const struct debug_named_value lp_perf_flags[] = {
  76    { "texmem",         PERF_TEX_MEM, NULL },
  77    { "no_mipmap",      PERF_NO_MIPMAPS, NULL },
  78    { "no_linear",      PERF_NO_LINEAR, NULL },
  79    { "no_mip_linear",  PERF_NO_MIP_LINEAR, NULL },
  80    { "no_tex",         PERF_NO_TEX, NULL },
  81    { "no_blend",       PERF_NO_BLEND, NULL },
  82    { "no_depth",       PERF_NO_DEPTH, NULL },
  83    { "no_alphatest",   PERF_NO_ALPHATEST, NULL },
  84    DEBUG_NAMED_VALUE_END
  85 };
  86
  87
  88 static const char *
  89 llvmpipe_get_vendor(struct pipe_screen *screen)
  90 {
  91    return "VMware, Inc.";
  92 }
  93
  94
  95 static const char *
  96 llvmpipe_get_name(struct pipe_screen *screen)
  97 {
  98    static char buf[100];
  99    util_snprintf(buf, sizeof(buf), "llvmpipe (LLVM %u.%u, %u bits)",
 100                  HAVE_LLVM >> 8, HAVE_LLVM & 0xff,
 101                  lp_native_vector_width );
 102    return buf;
 103 }
 104
 105
 106 static int
 107 llvmpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
 108 {
 109    switch (param) {
 110    case PIPE_CAP_NPOT_TEXTURES:
 111    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
 112       return 1;
 113    case PIPE_CAP_TWO_SIDED_STENCIL:
 114       return 1;
 115    case PIPE_CAP_SM3:
 116       return 1;
 117    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
 118       return 1;
 119    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 120       return PIPE_MAX_SO_BUFFERS;
 121    case PIPE_CAP_ANISOTROPIC_FILTER:
 122       return 0;
 123    case PIPE_CAP_POINT_SPRITE:
 124       return 1;
 125    case PIPE_CAP_MAX_RENDER_TARGETS:
 126       return PIPE_MAX_COLOR_BUFS;
 127    case PIPE_CAP_OCCLUSION_QUERY:
 128       return 1;
 129    case PIPE_CAP_QUERY_TIME_ELAPSED:
 130       return 0;
 131    case PIPE_CAP_QUERY_TIMESTAMP:
 132       return 1;
 133    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 134       return 0;
 135    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
 136       return 1;
 137    case PIPE_CAP_TEXTURE_SHADOW_MAP:
 138       return 1;
 139    case PIPE_CAP_TEXTURE_SWIZZLE:
 140       return 1;
 141    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
 142       return 0;
 143    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
 144       return LP_MAX_TEXTURE_2D_LEVELS;
 145    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 146       return LP_MAX_TEXTURE_3D_LEVELS;
 147    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 148       return LP_MAX_TEXTURE_CUBE_LEVELS;
 149    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 150       return LP_MAX_TEXTURE_ARRAY_LAYERS;
 151    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
 152       return 1;
 153    case PIPE_CAP_INDEP_BLEND_ENABLE:
 154       return 1;
 155    case PIPE_CAP_INDEP_BLEND_FUNC:
 156       return 1;
 157    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 158    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 159    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 160       return 1;
 161    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 162       return 0;
 163    case PIPE_CAP_PRIMITIVE_RESTART:
 164       return 1;
 165    case PIPE_CAP_DEPTH_CLIP_DISABLE:
 166       return 1;
 167    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 168       return 0;
 169    case PIPE_CAP_TGSI_INSTANCEID:
 170    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 171    case PIPE_CAP_START_INSTANCE:
 172       return 1;
 173    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 174       return 0;
 175    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 176       return 1;
 177    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 178    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 179       return 1;
 180    /* this is a lie could support arbitrary large offsets */
 181    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 182    case PIPE_CAP_MIN_TEXEL_OFFSET:
 183       return -8;
 184    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 185    case PIPE_CAP_MAX_TEXEL_OFFSET:
 186       return 7;
 187    case PIPE_CAP_CONDITIONAL_RENDER:
 188       return 1;
 189    case PIPE_CAP_TEXTURE_BARRIER:
 190       return 0;
 191    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 192    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 193       return 16*4;
 194    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 195    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 196       return 1024;
 197    case PIPE_CAP_MAX_VERTEX_STREAMS:
 198       return 1;
 199    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 200       return 1;
 201    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 202       return 0;
 203    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 204    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 205       return 1;
 206    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 207       return 330;
 208    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 209       return 0;
 210    case PIPE_CAP_COMPUTE:
 211       return 0;
 212    case PIPE_CAP_USER_VERTEX_BUFFERS:
 213    case PIPE_CAP_USER_INDEX_BUFFERS:
 214       return 1;
 215    case PIPE_CAP_USER_CONSTANT_BUFFERS:
 216       return 0;
 217    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 218    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 219    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 220    case PIPE_CAP_TGSI_TEXCOORD:
 221       return 0;
 222    case PIPE_CAP_DRAW_INDIRECT:
 223       return 1;
 224
 225    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 226       return 16;
 227    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 228    case PIPE_CAP_CUBE_MAP_ARRAY:
 229       return 0;
 230    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 231       return 64;
 232    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 233       return 1;
 234    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 235       return 65536;
 236    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 237       return 1;
 238    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 239       return 0;
 240    case PIPE_CAP_MAX_VIEWPORTS:
 241       return PIPE_MAX_VIEWPORTS;
 242    case PIPE_CAP_ENDIANNESS:
 243       return PIPE_ENDIAN_NATIVE;
 244    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 245    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 246    case PIPE_CAP_TEXTURE_GATHER_SM5:
 247    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 248    case PIPE_CAP_TEXTURE_QUERY_LOD:
 249    case PIPE_CAP_SAMPLE_SHADING:
 250    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 251    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 252    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 253       return 0;
 254    case PIPE_CAP_FAKE_SW_MSAA:
 255       return 1;
 256    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 257       return 1;
 258
 259    case PIPE_CAP_VENDOR_ID:
 260       return 0xFFFFFFFF;
 261    case PIPE_CAP_DEVICE_ID:
 262       return 0xFFFFFFFF;
 263    case PIPE_CAP_ACCELERATED:
 264       return 0;
 265    case PIPE_CAP_VIDEO_MEMORY: {
 266       /* XXX: Do we want to return the full amount fo system memory ? */
 267       uint64_t system_memory;
 268
 269       if (!os_get_total_physical_memory(&system_memory))
 270          return 0;
 271
 272       return (int)(system_memory >> 20);
 273    }
 274    case PIPE_CAP_UMA:
 275       return 0;
 276    }
 277    /* should only get here on unhandled cases */
 278    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 279    return 0;
 280 }
 281
 282 static int
 283 llvmpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 284 {
 285    switch(shader)
 286    {
 287    case PIPE_SHADER_FRAGMENT:
 288       switch (param) {
 289       default:
 290          return gallivm_get_shader_param(param);
 291       }
 292    case PIPE_SHADER_VERTEX:
 293    case PIPE_SHADER_GEOMETRY:
 294       switch (param) {
 295       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 296          /* At this time, the draw module and llvmpipe driver only
 297           * support vertex shader texture lookups when LLVM is enabled in
 298           * the draw module.
 299           */
 300          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 301             return PIPE_MAX_SAMPLERS;
 302          else
 303             return 0;
 304       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 305          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 306             return PIPE_MAX_SHADER_SAMPLER_VIEWS;
 307          else
 308             return 0;
 309       default:
 310          return draw_get_shader_param(shader, param);
 311       }
 312    default:
 313       return 0;
 314    }
 315 }
 316
 317 static float
 318 llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 319 {
 320    switch (param) {
 321    case PIPE_CAPF_MAX_LINE_WIDTH:
 322       /* fall-through */
 323    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 324       return 255.0; /* arbitrary */
 325    case PIPE_CAPF_MAX_POINT_WIDTH:
 326       /* fall-through */
 327    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 328       return 255.0; /* arbitrary */
 329    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 330       return 16.0; /* not actually signficant at this time */
 331    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 332       return 16.0; /* arbitrary */
 333    case PIPE_CAPF_GUARD_BAND_LEFT:
 334    case PIPE_CAPF_GUARD_BAND_TOP:
 335    case PIPE_CAPF_GUARD_BAND_RIGHT:
 336    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 337       return 0.0;
 338    }
 339    /* should only get here on unhandled cases */
 340    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 341    return 0.0;
 342 }
 343
 344
 345 /**
 346  * Query format support for creating a texture, drawing surface, etc.
 347  * \param format  the format to test
 348  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 349  */
 350 static boolean
 351 llvmpipe_is_format_supported( struct pipe_screen *_screen,
 352                               enum pipe_format format,
 353                               enum pipe_texture_target target,
 354                               unsigned sample_count,
 355                               unsigned bind)
 356 {
 357    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 358    struct sw_winsys *winsys = screen->winsys;
 359    const struct util_format_description *format_desc;
 360
 361    format_desc = util_format_description(format);
 362    if (!format_desc)
 363       return FALSE;
 364
 365    assert(target == PIPE_BUFFER ||
 366           target == PIPE_TEXTURE_1D ||
 367           target == PIPE_TEXTURE_1D_ARRAY ||
 368           target == PIPE_TEXTURE_2D ||
 369           target == PIPE_TEXTURE_2D_ARRAY ||
 370           target == PIPE_TEXTURE_RECT ||
 371           target == PIPE_TEXTURE_3D ||
 372           target == PIPE_TEXTURE_CUBE ||
 373           target == PIPE_TEXTURE_CUBE_ARRAY);
 374
 375    if (sample_count > 1)
 376       return FALSE;
 377
 378    if (bind & PIPE_BIND_RENDER_TARGET) {
 379       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 380          /* this is a lie actually other formats COULD exist where we would fail */
 381          if (format_desc->nr_channels < 3)
 382             return FALSE;
 383       }
 384       else if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_RGB)
 385          return FALSE;
 386
 387       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN &&
 388           format != PIPE_FORMAT_R11G11B10_FLOAT)
 389          return FALSE;
 390
 391       assert(format_desc->block.width == 1);
 392       assert(format_desc->block.height == 1);
 393
 394       if (format_desc->is_mixed)
 395          return FALSE;
 396
 397       if (!format_desc->is_array && !format_desc->is_bitmask &&
 398           format != PIPE_FORMAT_R11G11B10_FLOAT)
 399          return FALSE;
 400
 401       /*
 402        * XXX refuse formats known to crash in generate_unswizzled_blend().
 403        * These include all 3-channel 24bit RGB8 variants, plus 48bit
 404        * (except those using floats) 3-channel RGB16 variants (the latter
 405        * seems to be more of a llvm bug though).
 406        * The mesa state tracker only seems to use these for SINT/UINT formats.
 407        */
 408       if (format_desc->is_array && format_desc->nr_channels == 3) {
 409          if (format_desc->block.bits == 24 || (format_desc->block.bits == 48 &&
 410                !util_format_is_float(format))) {
 411             return FALSE;
 412          }
 413       }
 414    }
 415
 416    if (bind & PIPE_BIND_DISPLAY_TARGET) {
 417       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
 418          return FALSE;
 419    }
 420
 421    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 422       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 423          return FALSE;
 424
 425       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 426          return FALSE;
 427
 428       /* TODO: Support stencil-only formats */
 429       if (format_desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
 430          return FALSE;
 431       }
 432    }
 433
 434    if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC) {
 435       /* Software decoding is not hooked up. */
 436       return FALSE;
 437    }
 438
 439    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 440       return util_format_s3tc_enabled;
 441    }
 442
 443    /*
 444     * Everything can be supported by u_format
 445     * (those without fetch_rgba_float might be not but shouldn't hit that)
 446     */
 447
 448    return TRUE;
 449 }
 450
 451
 452
 453
 454 static void
 455 llvmpipe_flush_frontbuffer(struct pipe_screen *_screen,
 456                            struct pipe_resource *resource,
 457                            unsigned level, unsigned layer,
 458                            void *context_private,
 459                            struct pipe_box *sub_box)
 460 {
 461    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 462    struct sw_winsys *winsys = screen->winsys;
 463    struct llvmpipe_resource *texture = llvmpipe_resource(resource);
 464
 465    assert(texture->dt);
 466    if (texture->dt)
 467       winsys->displaytarget_display(winsys, texture->dt, context_private, sub_box);
 468 }
 469
 470 static void
 471 llvmpipe_destroy_screen( struct pipe_screen *_screen )
 472 {
 473    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 474    struct sw_winsys *winsys = screen->winsys;
 475
 476    if (screen->rast)
 477       lp_rast_destroy(screen->rast);
 478
 479    lp_jit_screen_cleanup(screen);
 480
 481    if(winsys->destroy)
 482       winsys->destroy(winsys);
 483
 484    pipe_mutex_destroy(screen->rast_mutex);
 485
 486    FREE(screen);
 487 }
 488
 489
 490
 491
 492 /**
 493  * Fence reference counting.
 494  */
 495 static void
 496 llvmpipe_fence_reference(struct pipe_screen *screen,
 497                          struct pipe_fence_handle **ptr,
 498                          struct pipe_fence_handle *fence)
 499 {
 500    struct lp_fence **old = (struct lp_fence **) ptr;
 501    struct lp_fence *f = (struct lp_fence *) fence;
 502
 503    lp_fence_reference(old, f);
 504 }
 505
 506
 507 /**
 508  * Has the fence been executed/finished?
 509  */
 510 static boolean
 511 llvmpipe_fence_signalled(struct pipe_screen *screen,
 512                          struct pipe_fence_handle *fence)
 513 {
 514    struct lp_fence *f = (struct lp_fence *) fence;
 515    return lp_fence_signalled(f);
 516 }
 517
 518
 519 /**
 520  * Wait for the fence to finish.
 521  */
 522 static boolean
 523 llvmpipe_fence_finish(struct pipe_screen *screen,
 524                       struct pipe_fence_handle *fence_handle,
 525                       uint64_t timeout)
 526 {
 527    struct lp_fence *f = (struct lp_fence *) fence_handle;
 528
 529    lp_fence_wait(f);
 530    return TRUE;
 531 }
 532
 533 static uint64_t
 534 llvmpipe_get_timestamp(struct pipe_screen *_screen)
 535 {
 536    return os_time_get_nano();
 537 }
 538
 539 /**
 540  * Create a new pipe_screen object
 541  * Note: we're not presently subclassing pipe_screen (no llvmpipe_screen).
 542  */
 543 struct pipe_screen *
 544 llvmpipe_create_screen(struct sw_winsys *winsys)
 545 {
 546    struct llvmpipe_screen *screen;
 547
 548    util_cpu_detect();
 549
 550 #if defined(PIPE_ARCH_X86) && HAVE_LLVM < 0x0302
 551    /* require SSE2 due to LLVM PR6960. */
 552    if (!util_cpu_caps.has_sse2)
 553        return NULL;
 554 #endif
 555
 556 #ifdef DEBUG
 557    LP_DEBUG = debug_get_flags_option("LP_DEBUG", lp_debug_flags, 0 );
 558 #endif
 559
 560    LP_PERF = debug_get_flags_option("LP_PERF", lp_perf_flags, 0 );
 561
 562    screen = CALLOC_STRUCT(llvmpipe_screen);
 563    if (!screen)
 564       return NULL;
 565
 566    screen->winsys = winsys;
 567
 568    screen->base.destroy = llvmpipe_destroy_screen;
 569
 570    screen->base.get_name = llvmpipe_get_name;
 571    screen->base.get_vendor = llvmpipe_get_vendor;
 572    screen->base.get_param = llvmpipe_get_param;
 573    screen->base.get_shader_param = llvmpipe_get_shader_param;
 574    screen->base.get_paramf = llvmpipe_get_paramf;
 575    screen->base.is_format_supported = llvmpipe_is_format_supported;
 576
 577    screen->base.context_create = llvmpipe_create_context;
 578    screen->base.flush_frontbuffer = llvmpipe_flush_frontbuffer;
 579    screen->base.fence_reference = llvmpipe_fence_reference;
 580    screen->base.fence_signalled = llvmpipe_fence_signalled;
 581    screen->base.fence_finish = llvmpipe_fence_finish;
 582
 583    screen->base.get_timestamp = llvmpipe_get_timestamp;
 584
 585    llvmpipe_init_screen_resource_funcs(&screen->base);
 586
 587    lp_jit_screen_init(screen);
 588
 589    screen->num_threads = util_cpu_caps.nr_cpus > 1 ? util_cpu_caps.nr_cpus : 0;
 590 #ifdef PIPE_SUBSYSTEM_EMBEDDED
 591    screen->num_threads = 0;
 592 #endif
 593    screen->num_threads = debug_get_num_option("LP_NUM_THREADS", screen->num_threads);
 594    screen->num_threads = MIN2(screen->num_threads, LP_MAX_THREADS);
 595
 596    screen->rast = lp_rast_create(screen->num_threads);
 597    if (!screen->rast) {
 598       lp_jit_screen_cleanup(screen);
 599       FREE(screen);
 600       return NULL;
 601    }
 602    pipe_mutex_init(screen->rast_mutex);
 603
 604    util_format_s3tc_init();
 605
 606    return &screen->base;
 607 }