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 1;
 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 -32;
 184    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 185    case PIPE_CAP_MAX_TEXEL_OFFSET:
 186       return 31;
 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_MAX_VERTEX_ATTRIB_STRIDE:
 200       return 2048;
 201    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 202       return 1;
 203    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 204       return 0;
 205    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 206    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 207       return 1;
 208    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 209       return 330;
 210    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 211       return 0;
 212    case PIPE_CAP_COMPUTE:
 213       return 0;
 214    case PIPE_CAP_USER_VERTEX_BUFFERS:
 215    case PIPE_CAP_USER_INDEX_BUFFERS:
 216       return 1;
 217    case PIPE_CAP_USER_CONSTANT_BUFFERS:
 218       return 0;
 219    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 220    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 221    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 222    case PIPE_CAP_TGSI_TEXCOORD:
 223       return 0;
 224    case PIPE_CAP_DRAW_INDIRECT:
 225       return 1;
 226
 227    case PIPE_CAP_CUBE_MAP_ARRAY:
 228       return 1;
 229    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 230       return 16;
 231    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 232       return 0;
 233    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 234       return 64;
 235    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 236       return 1;
 237    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 238       return 65536;
 239    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 240       return 1;
 241    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 242       return 0;
 243    case PIPE_CAP_MAX_VIEWPORTS:
 244       return PIPE_MAX_VIEWPORTS;
 245    case PIPE_CAP_ENDIANNESS:
 246       return PIPE_ENDIAN_NATIVE;
 247    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 248       return 1;
 249    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 250       return 1;
 251    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 252       return 4;
 253    case PIPE_CAP_TEXTURE_GATHER_SM5:
 254    case PIPE_CAP_TEXTURE_QUERY_LOD:
 255    case PIPE_CAP_SAMPLE_SHADING:
 256    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 257       return 0;
 258    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 259       return 1;
 260    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 261       return 0;
 262    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 263       return 1;
 264    case PIPE_CAP_FAKE_SW_MSAA:
 265       return 1;
 266    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 267       return 1;
 268
 269    case PIPE_CAP_VENDOR_ID:
 270       return 0xFFFFFFFF;
 271    case PIPE_CAP_DEVICE_ID:
 272       return 0xFFFFFFFF;
 273    case PIPE_CAP_ACCELERATED:
 274       return 0;
 275    case PIPE_CAP_VIDEO_MEMORY: {
 276       /* XXX: Do we want to return the full amount fo system memory ? */
 277       uint64_t system_memory;
 278
 279       if (!os_get_total_physical_memory(&system_memory))
 280          return 0;
 281
 282       return (int)(system_memory >> 20);
 283    }
 284    case PIPE_CAP_UMA:
 285       return 0;
 286    case PIPE_CAP_CLIP_HALFZ:
 287       return 1;
 288    case PIPE_CAP_VERTEXID_NOBASE:
 289       return 0;
 290    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 291       return 1;
 292    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 293    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 294    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 295    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 296       return 0;
 297    }
 298    /* should only get here on unhandled cases */
 299    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 300    return 0;
 301 }
 302
 303 static int
 304 llvmpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 305 {
 306    switch(shader)
 307    {
 308    case PIPE_SHADER_FRAGMENT:
 309       switch (param) {
 310       default:
 311          return gallivm_get_shader_param(param);
 312       }
 313    case PIPE_SHADER_VERTEX:
 314    case PIPE_SHADER_GEOMETRY:
 315       switch (param) {
 316       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 317          /* At this time, the draw module and llvmpipe driver only
 318           * support vertex shader texture lookups when LLVM is enabled in
 319           * the draw module.
 320           */
 321          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 322             return PIPE_MAX_SAMPLERS;
 323          else
 324             return 0;
 325       case PIPE_SHADER_CAP_MAX_SAMPLER_VIEWS:
 326          if (debug_get_bool_option("DRAW_USE_LLVM", TRUE))
 327             return PIPE_MAX_SHADER_SAMPLER_VIEWS;
 328          else
 329             return 0;
 330       default:
 331          return draw_get_shader_param(shader, param);
 332       }
 333    default:
 334       return 0;
 335    }
 336 }
 337
 338 static float
 339 llvmpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 340 {
 341    switch (param) {
 342    case PIPE_CAPF_MAX_LINE_WIDTH:
 343       /* fall-through */
 344    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 345       return 255.0; /* arbitrary */
 346    case PIPE_CAPF_MAX_POINT_WIDTH:
 347       /* fall-through */
 348    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 349       return 255.0; /* arbitrary */
 350    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 351       return 16.0; /* not actually signficant at this time */
 352    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 353       return 16.0; /* arbitrary */
 354    case PIPE_CAPF_GUARD_BAND_LEFT:
 355    case PIPE_CAPF_GUARD_BAND_TOP:
 356    case PIPE_CAPF_GUARD_BAND_RIGHT:
 357    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 358       return 0.0;
 359    }
 360    /* should only get here on unhandled cases */
 361    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 362    return 0.0;
 363 }
 364
 365
 366 /**
 367  * Query format support for creating a texture, drawing surface, etc.
 368  * \param format  the format to test
 369  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 370  */
 371 static boolean
 372 llvmpipe_is_format_supported( struct pipe_screen *_screen,
 373                               enum pipe_format format,
 374                               enum pipe_texture_target target,
 375                               unsigned sample_count,
 376                               unsigned bind)
 377 {
 378    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 379    struct sw_winsys *winsys = screen->winsys;
 380    const struct util_format_description *format_desc;
 381
 382    format_desc = util_format_description(format);
 383    if (!format_desc)
 384       return FALSE;
 385
 386    assert(target == PIPE_BUFFER ||
 387           target == PIPE_TEXTURE_1D ||
 388           target == PIPE_TEXTURE_1D_ARRAY ||
 389           target == PIPE_TEXTURE_2D ||
 390           target == PIPE_TEXTURE_2D_ARRAY ||
 391           target == PIPE_TEXTURE_RECT ||
 392           target == PIPE_TEXTURE_3D ||
 393           target == PIPE_TEXTURE_CUBE ||
 394           target == PIPE_TEXTURE_CUBE_ARRAY);
 395
 396    if (sample_count > 1)
 397       return FALSE;
 398
 399    if (bind & PIPE_BIND_RENDER_TARGET) {
 400       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) {
 401          /* this is a lie actually other formats COULD exist where we would fail */
 402          if (format_desc->nr_channels < 3)
 403             return FALSE;
 404       }
 405       else if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_RGB)
 406          return FALSE;
 407
 408       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN &&
 409           format != PIPE_FORMAT_R11G11B10_FLOAT)
 410          return FALSE;
 411
 412       assert(format_desc->block.width == 1);
 413       assert(format_desc->block.height == 1);
 414
 415       if (format_desc->is_mixed)
 416          return FALSE;
 417
 418       if (!format_desc->is_array && !format_desc->is_bitmask &&
 419           format != PIPE_FORMAT_R11G11B10_FLOAT)
 420          return FALSE;
 421
 422       /*
 423        * XXX refuse formats known to crash in generate_unswizzled_blend().
 424        * These include all 3-channel 24bit RGB8 variants, plus 48bit
 425        * (except those using floats) 3-channel RGB16 variants (the latter
 426        * seems to be more of a llvm bug though).
 427        * The mesa state tracker only seems to use these for SINT/UINT formats.
 428        */
 429       if (format_desc->is_array && format_desc->nr_channels == 3) {
 430          if (format_desc->block.bits == 24 || (format_desc->block.bits == 48 &&
 431                !util_format_is_float(format))) {
 432             return FALSE;
 433          }
 434       }
 435    }
 436
 437    if (bind & PIPE_BIND_DISPLAY_TARGET) {
 438       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
 439          return FALSE;
 440    }
 441
 442    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 443       if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 444          return FALSE;
 445
 446       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 447          return FALSE;
 448
 449       /* TODO: Support stencil-only formats */
 450       if (format_desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_NONE) {
 451          return FALSE;
 452       }
 453    }
 454
 455    if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC) {
 456       /* Software decoding is not hooked up. */
 457       return FALSE;
 458    }
 459
 460    if (format_desc->layout == UTIL_FORMAT_LAYOUT_ETC &&
 461        format != PIPE_FORMAT_ETC1_RGB8)
 462       return FALSE;
 463
 464    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 465       return util_format_s3tc_enabled;
 466    }
 467
 468    /*
 469     * Everything can be supported by u_format
 470     * (those without fetch_rgba_float might be not but shouldn't hit that)
 471     */
 472
 473    return TRUE;
 474 }
 475
 476
 477
 478
 479 static void
 480 llvmpipe_flush_frontbuffer(struct pipe_screen *_screen,
 481                            struct pipe_resource *resource,
 482                            unsigned level, unsigned layer,
 483                            void *context_private,
 484                            struct pipe_box *sub_box)
 485 {
 486    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 487    struct sw_winsys *winsys = screen->winsys;
 488    struct llvmpipe_resource *texture = llvmpipe_resource(resource);
 489
 490    assert(texture->dt);
 491    if (texture->dt)
 492       winsys->displaytarget_display(winsys, texture->dt, context_private, sub_box);
 493 }
 494
 495 static void
 496 llvmpipe_destroy_screen( struct pipe_screen *_screen )
 497 {
 498    struct llvmpipe_screen *screen = llvmpipe_screen(_screen);
 499    struct sw_winsys *winsys = screen->winsys;
 500
 501    if (screen->rast)
 502       lp_rast_destroy(screen->rast);
 503
 504    lp_jit_screen_cleanup(screen);
 505
 506    if(winsys->destroy)
 507       winsys->destroy(winsys);
 508
 509    pipe_mutex_destroy(screen->rast_mutex);
 510
 511    FREE(screen);
 512 }
 513
 514
 515
 516
 517 /**
 518  * Fence reference counting.
 519  */
 520 static void
 521 llvmpipe_fence_reference(struct pipe_screen *screen,
 522                          struct pipe_fence_handle **ptr,
 523                          struct pipe_fence_handle *fence)
 524 {
 525    struct lp_fence **old = (struct lp_fence **) ptr;
 526    struct lp_fence *f = (struct lp_fence *) fence;
 527
 528    lp_fence_reference(old, f);
 529 }
 530
 531
 532 /**
 533  * Wait for the fence to finish.
 534  */
 535 static boolean
 536 llvmpipe_fence_finish(struct pipe_screen *screen,
 537                       struct pipe_fence_handle *fence_handle,
 538                       uint64_t timeout)
 539 {
 540    struct lp_fence *f = (struct lp_fence *) fence_handle;
 541
 542    if (!timeout)
 543       return lp_fence_signalled(f);
 544
 545    lp_fence_wait(f);
 546    return TRUE;
 547 }
 548
 549 static uint64_t
 550 llvmpipe_get_timestamp(struct pipe_screen *_screen)
 551 {
 552    return os_time_get_nano();
 553 }
 554
 555 /**
 556  * Create a new pipe_screen object
 557  * Note: we're not presently subclassing pipe_screen (no llvmpipe_screen).
 558  */
 559 struct pipe_screen *
 560 llvmpipe_create_screen(struct sw_winsys *winsys)
 561 {
 562    struct llvmpipe_screen *screen;
 563
 564    util_cpu_detect();
 565
 566 #ifdef DEBUG
 567    LP_DEBUG = debug_get_flags_option("LP_DEBUG", lp_debug_flags, 0 );
 568 #endif
 569
 570    LP_PERF = debug_get_flags_option("LP_PERF", lp_perf_flags, 0 );
 571
 572    screen = CALLOC_STRUCT(llvmpipe_screen);
 573    if (!screen)
 574       return NULL;
 575
 576    if (!lp_jit_screen_init(screen)) {
 577       FREE(screen);
 578       return NULL;
 579    }
 580
 581    screen->winsys = winsys;
 582
 583    screen->base.destroy = llvmpipe_destroy_screen;
 584
 585    screen->base.get_name = llvmpipe_get_name;
 586    screen->base.get_vendor = llvmpipe_get_vendor;
 587    screen->base.get_device_vendor = llvmpipe_get_vendor; // TODO should be the CPU vendor
 588    screen->base.get_param = llvmpipe_get_param;
 589    screen->base.get_shader_param = llvmpipe_get_shader_param;
 590    screen->base.get_paramf = llvmpipe_get_paramf;
 591    screen->base.is_format_supported = llvmpipe_is_format_supported;
 592
 593    screen->base.context_create = llvmpipe_create_context;
 594    screen->base.flush_frontbuffer = llvmpipe_flush_frontbuffer;
 595    screen->base.fence_reference = llvmpipe_fence_reference;
 596    screen->base.fence_finish = llvmpipe_fence_finish;
 597
 598    screen->base.get_timestamp = llvmpipe_get_timestamp;
 599
 600    llvmpipe_init_screen_resource_funcs(&screen->base);
 601
 602    screen->num_threads = util_cpu_caps.nr_cpus > 1 ? util_cpu_caps.nr_cpus : 0;
 603 #ifdef PIPE_SUBSYSTEM_EMBEDDED
 604    screen->num_threads = 0;
 605 #endif
 606    screen->num_threads = debug_get_num_option("LP_NUM_THREADS", screen->num_threads);
 607    screen->num_threads = MIN2(screen->num_threads, LP_MAX_THREADS);
 608
 609    screen->rast = lp_rast_create(screen->num_threads);
 610    if (!screen->rast) {
 611       lp_jit_screen_cleanup(screen);
 612       FREE(screen);
 613       return NULL;
 614    }
 615    pipe_mutex_init(screen->rast_mutex);
 616
 617    util_format_s3tc_init();
 618
 619    return &screen->base;
 620 }