src/gallium/drivers/softpipe/sp_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/format/u_format.h"
  31 #include "util/format/u_format_s3tc.h"
  32 #include "util/u_screen.h"
  33 #include "util/u_video.h"
  34 #include "util/os_misc.h"
  35 #include "util/os_time.h"
  36 #include "pipe/p_defines.h"
  37 #include "pipe/p_screen.h"
  38 #include "draw/draw_context.h"
  39
  40 #include "frontend/sw_winsys.h"
  41 #include "tgsi/tgsi_exec.h"
  42
  43 #include "sp_texture.h"
  44 #include "sp_screen.h"
  45 #include "sp_context.h"
  46 #include "sp_fence.h"
  47 #include "sp_public.h"
  48
  49 static const struct debug_named_value sp_debug_options[] = {
  50    {"vs",        SP_DBG_VS,         "dump vertex shader assembly to stderr"},
  51    {"gs",        SP_DBG_GS,         "dump geometry shader assembly to stderr"},
  52    {"fs",        SP_DBG_FS,         "dump fragment shader assembly to stderr"},
  53    {"cs",        SP_DBG_CS,         "dump compute shader assembly to stderr"},
  54    {"no_rast",   SP_DBG_NO_RAST,    "no-ops rasterization, for profiling purposes"},
  55    {"use_llvm",  SP_DBG_USE_LLVM,   "Use LLVM if available for shaders"},
  56 };
  57
  58 int sp_debug;
  59 DEBUG_GET_ONCE_FLAGS_OPTION(sp_debug, "SOFTPIPE_DEBUG", sp_debug_options, 0)
  60
  61 static const char *
  62 softpipe_get_vendor(struct pipe_screen *screen)
  63 {
  64    return "Mesa/X.org";
  65 }
  66
  67
  68 static const char *
  69 softpipe_get_name(struct pipe_screen *screen)
  70 {
  71    return "softpipe";
  72 }
  73
  74
  75 static int
  76 softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
  77 {
  78    struct softpipe_screen *sp_screen = softpipe_screen(screen);
  79    switch (param) {
  80    case PIPE_CAP_NPOT_TEXTURES:
  81    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
  82    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
  83       return 1;
  84    case PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD:
  85    case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
  86    case PIPE_CAP_VERTEX_SHADER_SATURATE:
  87       return 1;
  88    case PIPE_CAP_ANISOTROPIC_FILTER:
  89       return 1;
  90    case PIPE_CAP_POINT_SPRITE:
  91       return 1;
  92    case PIPE_CAP_MAX_RENDER_TARGETS:
  93       return PIPE_MAX_COLOR_BUFS;
  94    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
  95       return 1;
  96    case PIPE_CAP_OCCLUSION_QUERY:
  97       return 1;
  98    case PIPE_CAP_QUERY_TIME_ELAPSED:
  99       return 1;
 100    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 101       return 1;
 102    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
 103    case PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE:
 104       return 1;
 105    case PIPE_CAP_TEXTURE_SWIZZLE:
 106       return 1;
 107    case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
 108       return 1 << (SP_MAX_TEXTURE_2D_LEVELS - 1);
 109    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 110       return SP_MAX_TEXTURE_3D_LEVELS;
 111    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 112       return SP_MAX_TEXTURE_CUBE_LEVELS;
 113    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
 114       return 1;
 115    case PIPE_CAP_INDEP_BLEND_ENABLE:
 116       return 1;
 117    case PIPE_CAP_INDEP_BLEND_FUNC:
 118       return 1;
 119    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 120    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 121    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 122    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 123       return 1;
 124    case PIPE_CAP_DEPTH_CLIP_DISABLE:
 125       return 1;
 126    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 127       return PIPE_MAX_SO_BUFFERS;
 128    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 129    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 130       return 16*4;
 131    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 132    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 133       return 1024;
 134    case PIPE_CAP_MAX_VERTEX_STREAMS:
 135       if (sp_screen->use_llvm)
 136          return 1;
 137       else
 138          return PIPE_MAX_VERTEX_STREAMS;
 139    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 140       return 2048;
 141    case PIPE_CAP_PRIMITIVE_RESTART:
 142    case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
 143       return 1;
 144    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 145       return 1;
 146    case PIPE_CAP_TGSI_ATOMFADD:
 147    case PIPE_CAP_TGSI_INSTANCEID:
 148    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 149    case PIPE_CAP_START_INSTANCE:
 150       return 1;
 151    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 152    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 153       return 1;
 154    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 155       return 256; /* for GL3 */
 156    case PIPE_CAP_MIN_TEXEL_OFFSET:
 157       return -8;
 158    case PIPE_CAP_MAX_TEXEL_OFFSET:
 159       return 7;
 160    case PIPE_CAP_CONDITIONAL_RENDER:
 161    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 162    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED: /* draw module */
 163    case PIPE_CAP_VERTEX_COLOR_CLAMPED: /* draw module */
 164       return 1;
 165    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 166       return 1;
 167    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 168       return 400;
 169    case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
 170       return 140;
 171    case PIPE_CAP_COMPUTE:
 172       return 1;
 173    case PIPE_CAP_USER_VERTEX_BUFFERS:
 174    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 175    case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
 176    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 177    case PIPE_CAP_DOUBLES:
 178    case PIPE_CAP_INT64:
 179    case PIPE_CAP_INT64_DIVMOD:
 180    case PIPE_CAP_TGSI_DIV:
 181       return 1;
 182    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 183       return 16;
 184    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 185       return 64;
 186    case PIPE_CAP_QUERY_TIMESTAMP:
 187    case PIPE_CAP_CUBE_MAP_ARRAY:
 188       return 1;
 189    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 190       return 1;
 191    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 192       return 65536;
 193    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 194       return 16;
 195    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 196       return 0;
 197    case PIPE_CAP_MAX_VIEWPORTS:
 198       return PIPE_MAX_VIEWPORTS;
 199    case PIPE_CAP_ENDIANNESS:
 200       return PIPE_ENDIAN_NATIVE;
 201    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 202       return 4;
 203    case PIPE_CAP_TEXTURE_GATHER_SM5:
 204    case PIPE_CAP_TEXTURE_QUERY_LOD:
 205       return 1;
 206    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 207       return 1;
 208    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 209       return 1;
 210    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 211       return 1;
 212    case PIPE_CAP_FAKE_SW_MSAA:
 213       return 1;
 214    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 215       return -32;
 216    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 217       return 31;
 218    case PIPE_CAP_DRAW_INDIRECT:
 219       return 1;
 220    case PIPE_CAP_QUERY_SO_OVERFLOW:
 221       return 1;
 222
 223    case PIPE_CAP_VENDOR_ID:
 224       return 0xFFFFFFFF;
 225    case PIPE_CAP_DEVICE_ID:
 226       return 0xFFFFFFFF;
 227    case PIPE_CAP_ACCELERATED:
 228       return 0;
 229    case PIPE_CAP_VIDEO_MEMORY: {
 230       /* XXX: Do we want to return the full amount fo system memory ? */
 231       uint64_t system_memory;
 232
 233       if (!os_get_total_physical_memory(&system_memory))
 234          return 0;
 235
 236       if (sizeof(void *) == 4)
 237          /* Cap to 2 GB on 32 bits system. We do this because softpipe does
 238           * eat application memory, which is quite limited on 32 bits. App
 239           * shouldn't expect too much available memory. */
 240          system_memory = MIN2(system_memory, 2048 << 20);
 241
 242       return (int)(system_memory >> 20);
 243    }
 244    case PIPE_CAP_UMA:
 245       return 0;
 246    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 247       return 1;
 248    case PIPE_CAP_CLIP_HALFZ:
 249    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 250    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 251       return 1;
 252    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 253    case PIPE_CAP_CULL_DISTANCE:
 254    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 255    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 256       return 1;
 257    case PIPE_CAP_CLEAR_TEXTURE:
 258       return 1;
 259    case PIPE_CAP_MAX_VARYINGS:
 260       return TGSI_EXEC_MAX_INPUT_ATTRIBS;
 261    case PIPE_CAP_PCI_GROUP:
 262    case PIPE_CAP_PCI_BUS:
 263    case PIPE_CAP_PCI_DEVICE:
 264    case PIPE_CAP_PCI_FUNCTION:
 265    case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
 266       return 0;
 267    case PIPE_CAP_MAX_GS_INVOCATIONS:
 268       return 32;
 269    case PIPE_CAP_MAX_SHADER_BUFFER_SIZE:
 270       return 1 << 27;
 271    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 272       return 4;
 273    default:
 274       return u_pipe_screen_get_param_defaults(screen, param);
 275    }
 276 }
 277
 278 static int
 279 softpipe_get_shader_param(struct pipe_screen *screen,
 280                           enum pipe_shader_type shader,
 281                           enum pipe_shader_cap param)
 282 {
 283    struct softpipe_screen *sp_screen = softpipe_screen(screen);
 284    switch(shader)
 285    {
 286    case PIPE_SHADER_FRAGMENT:
 287       return tgsi_exec_get_shader_param(param);
 288    case PIPE_SHADER_COMPUTE:
 289       return tgsi_exec_get_shader_param(param);
 290    case PIPE_SHADER_VERTEX:
 291    case PIPE_SHADER_GEOMETRY:
 292       if (sp_screen->use_llvm)
 293          return draw_get_shader_param(shader, param);
 294       else
 295          return draw_get_shader_param_no_llvm(shader, param);
 296    default:
 297       return 0;
 298    }
 299 }
 300
 301 static float
 302 softpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 303 {
 304    switch (param) {
 305    case PIPE_CAPF_MAX_LINE_WIDTH:
 306       /* fall-through */
 307    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 308       return 255.0; /* arbitrary */
 309    case PIPE_CAPF_MAX_POINT_WIDTH:
 310       /* fall-through */
 311    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 312       return 255.0; /* arbitrary */
 313    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 314       return 16.0;
 315    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 316       return 16.0; /* arbitrary */
 317    case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
 318       return 0.0;
 319    case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
 320       return 0.0;
 321    case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
 322       return 0.0;
 323    }
 324    /* should only get here on unhandled cases */
 325    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
 326    return 0.0;
 327 }
 328
 329 /**
 330  * Query format support for creating a texture, drawing surface, etc.
 331  * \param format  the format to test
 332  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 333  */
 334 static bool
 335 softpipe_is_format_supported( struct pipe_screen *screen,
 336                               enum pipe_format format,
 337                               enum pipe_texture_target target,
 338                               unsigned sample_count,
 339                               unsigned storage_sample_count,
 340                               unsigned bind)
 341 {
 342    struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
 343    const struct util_format_description *format_desc;
 344
 345    assert(target == PIPE_BUFFER ||
 346           target == PIPE_TEXTURE_1D ||
 347           target == PIPE_TEXTURE_1D_ARRAY ||
 348           target == PIPE_TEXTURE_2D ||
 349           target == PIPE_TEXTURE_2D_ARRAY ||
 350           target == PIPE_TEXTURE_RECT ||
 351           target == PIPE_TEXTURE_3D ||
 352           target == PIPE_TEXTURE_CUBE ||
 353           target == PIPE_TEXTURE_CUBE_ARRAY);
 354
 355    if (MAX2(1, sample_count) != MAX2(1, storage_sample_count))
 356       return false;
 357
 358    format_desc = util_format_description(format);
 359    if (!format_desc)
 360       return false;
 361
 362    if (sample_count > 1)
 363       return false;
 364
 365    if (bind & (PIPE_BIND_DISPLAY_TARGET |
 366                PIPE_BIND_SCANOUT |
 367                PIPE_BIND_SHARED)) {
 368       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
 369          return false;
 370    }
 371
 372    if (bind & PIPE_BIND_RENDER_TARGET) {
 373       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
 374          return false;
 375
 376       /*
 377        * Although possible, it is unnatural to render into compressed or YUV
 378        * surfaces. So disable these here to avoid going into weird paths
 379        * inside gallium frontends.
 380        */
 381       if (format_desc->block.width != 1 ||
 382           format_desc->block.height != 1)
 383          return false;
 384    }
 385
 386    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 387       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 388          return false;
 389    }
 390
 391    if (format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC ||
 392        format_desc->layout == UTIL_FORMAT_LAYOUT_ATC) {
 393       /* Software decoding is not hooked up. */
 394       return false;
 395    }
 396
 397    if ((bind & (PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW)) &&
 398        ((bind & PIPE_BIND_DISPLAY_TARGET) == 0) &&
 399        target != PIPE_BUFFER) {
 400       const struct util_format_description *desc =
 401          util_format_description(format);
 402       if (desc->nr_channels == 3 && desc->is_array) {
 403          /* Don't support any 3-component formats for rendering/texturing
 404           * since we don't support the corresponding 8-bit 3 channel UNORM
 405           * formats.  This allows us to support GL_ARB_copy_image between
 406           * GL_RGB8 and GL_RGB8UI, for example.  Otherwise, we may be asked to
 407           * do a resource copy between PIPE_FORMAT_R8G8B8_UINT and
 408           * PIPE_FORMAT_R8G8B8X8_UNORM, for example, which will not work
 409           * (different bpp).
 410           */
 411          return false;
 412       }
 413    }
 414
 415    if (format_desc->layout == UTIL_FORMAT_LAYOUT_ETC &&
 416        format != PIPE_FORMAT_ETC1_RGB8)
 417       return false;
 418
 419    /*
 420     * All other operations (sampling, transfer, etc).
 421     */
 422
 423    /*
 424     * Everything else should be supported by u_format.
 425     */
 426    return true;
 427 }
 428
 429
 430 static void
 431 softpipe_destroy_screen( struct pipe_screen *screen )
 432 {
 433    struct softpipe_screen *sp_screen = softpipe_screen(screen);
 434    struct sw_winsys *winsys = sp_screen->winsys;
 435
 436    if(winsys->destroy)
 437       winsys->destroy(winsys);
 438
 439    FREE(screen);
 440 }
 441
 442
 443 /* This is often overriden by the co-state tracker.
 444  */
 445 static void
 446 softpipe_flush_frontbuffer(struct pipe_screen *_screen,
 447                            struct pipe_resource *resource,
 448                            unsigned level, unsigned layer,
 449                            void *context_private,
 450                            struct pipe_box *sub_box)
 451 {
 452    struct softpipe_screen *screen = softpipe_screen(_screen);
 453    struct sw_winsys *winsys = screen->winsys;
 454    struct softpipe_resource *texture = softpipe_resource(resource);
 455
 456    assert(texture->dt);
 457    if (texture->dt)
 458       winsys->displaytarget_display(winsys, texture->dt, context_private, sub_box);
 459 }
 460
 461 static uint64_t
 462 softpipe_get_timestamp(struct pipe_screen *_screen)
 463 {
 464    return os_time_get_nano();
 465 }
 466
 467 static int
 468 softpipe_get_compute_param(struct pipe_screen *_screen,
 469                            enum pipe_shader_ir ir_type,
 470                            enum pipe_compute_cap param,
 471                            void *ret)
 472 {
 473    switch (param) {
 474    case PIPE_COMPUTE_CAP_IR_TARGET:
 475       return 0;
 476    case PIPE_COMPUTE_CAP_MAX_GRID_SIZE:
 477       if (ret) {
 478          uint64_t *grid_size = ret;
 479          grid_size[0] = 65535;
 480          grid_size[1] = 65535;
 481          grid_size[2] = 65535;
 482       }
 483       return 3 * sizeof(uint64_t) ;
 484    case PIPE_COMPUTE_CAP_MAX_BLOCK_SIZE:
 485       if (ret) {
 486          uint64_t *block_size = ret;
 487          block_size[0] = 1024;
 488          block_size[1] = 1024;
 489          block_size[2] = 1024;
 490       }
 491       return 3 * sizeof(uint64_t);
 492    case PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK:
 493       if (ret) {
 494          uint64_t *max_threads_per_block = ret;
 495          *max_threads_per_block = 1024;
 496       }
 497       return sizeof(uint64_t);
 498    case PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE:
 499       if (ret) {
 500          uint64_t *max_local_size = ret;
 501          *max_local_size = 32768;
 502       }
 503       return sizeof(uint64_t);
 504    case PIPE_COMPUTE_CAP_GRID_DIMENSION:
 505    case PIPE_COMPUTE_CAP_MAX_GLOBAL_SIZE:
 506    case PIPE_COMPUTE_CAP_MAX_PRIVATE_SIZE:
 507    case PIPE_COMPUTE_CAP_MAX_INPUT_SIZE:
 508    case PIPE_COMPUTE_CAP_MAX_MEM_ALLOC_SIZE:
 509    case PIPE_COMPUTE_CAP_MAX_CLOCK_FREQUENCY:
 510    case PIPE_COMPUTE_CAP_MAX_COMPUTE_UNITS:
 511    case PIPE_COMPUTE_CAP_IMAGES_SUPPORTED:
 512    case PIPE_COMPUTE_CAP_SUBGROUP_SIZE:
 513    case PIPE_COMPUTE_CAP_ADDRESS_BITS:
 514    case PIPE_COMPUTE_CAP_MAX_VARIABLE_THREADS_PER_BLOCK:
 515       break;
 516    }
 517    return 0;
 518 }
 519
 520 /**
 521  * Create a new pipe_screen object
 522  * Note: we're not presently subclassing pipe_screen (no softpipe_screen).
 523  */
 524 struct pipe_screen *
 525 softpipe_create_screen(struct sw_winsys *winsys)
 526 {
 527    struct softpipe_screen *screen = CALLOC_STRUCT(softpipe_screen);
 528
 529    if (!screen)
 530       return NULL;
 531
 532    sp_debug = debug_get_option_sp_debug();
 533
 534    screen->winsys = winsys;
 535
 536    screen->base.destroy = softpipe_destroy_screen;
 537
 538    screen->base.get_name = softpipe_get_name;
 539    screen->base.get_vendor = softpipe_get_vendor;
 540    screen->base.get_device_vendor = softpipe_get_vendor; // TODO should be the CPU vendor
 541    screen->base.get_param = softpipe_get_param;
 542    screen->base.get_shader_param = softpipe_get_shader_param;
 543    screen->base.get_paramf = softpipe_get_paramf;
 544    screen->base.get_timestamp = softpipe_get_timestamp;
 545    screen->base.is_format_supported = softpipe_is_format_supported;
 546    screen->base.context_create = softpipe_create_context;
 547    screen->base.flush_frontbuffer = softpipe_flush_frontbuffer;
 548    screen->base.get_compute_param = softpipe_get_compute_param;
 549    screen->use_llvm = sp_debug & SP_DBG_USE_LLVM;
 550
 551    softpipe_init_screen_texture_funcs(&screen->base);
 552    softpipe_init_screen_fence_funcs(&screen->base);
 553
 554    return &screen->base;
 555 }