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/u_format.h"
  31 #include "util/u_format_s3tc.h"
  32 #include "util/u_video.h"
  33 #include "os/os_misc.h"
  34 #include "os/os_time.h"
  35 #include "pipe/p_defines.h"
  36 #include "pipe/p_screen.h"
  37 #include "draw/draw_context.h"
  38
  39 #include "state_tracker/sw_winsys.h"
  40 #include "tgsi/tgsi_exec.h"
  41
  42 #include "sp_texture.h"
  43 #include "sp_screen.h"
  44 #include "sp_context.h"
  45 #include "sp_fence.h"
  46 #include "sp_public.h"
  47
  48 DEBUG_GET_ONCE_BOOL_OPTION(use_llvm, "SOFTPIPE_USE_LLVM", FALSE)
  49
  50 static const char *
  51 softpipe_get_vendor(struct pipe_screen *screen)
  52 {
  53    return "VMware, Inc.";
  54 }
  55
  56
  57 static const char *
  58 softpipe_get_name(struct pipe_screen *screen)
  59 {
  60    return "softpipe";
  61 }
  62
  63
  64 static int
  65 softpipe_get_param(struct pipe_screen *screen, enum pipe_cap param)
  66 {
  67    switch (param) {
  68    case PIPE_CAP_NPOT_TEXTURES:
  69    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
  70    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
  71       return 1;
  72    case PIPE_CAP_TWO_SIDED_STENCIL:
  73       return 1;
  74    case PIPE_CAP_SM3:
  75       return 1;
  76    case PIPE_CAP_ANISOTROPIC_FILTER:
  77       return 1;
  78    case PIPE_CAP_POINT_SPRITE:
  79       return 1;
  80    case PIPE_CAP_MAX_RENDER_TARGETS:
  81       return PIPE_MAX_COLOR_BUFS;
  82    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
  83       return 1;
  84    case PIPE_CAP_OCCLUSION_QUERY:
  85       return 1;
  86    case PIPE_CAP_QUERY_TIME_ELAPSED:
  87       return 1;
  88    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
  89       return 1;
  90    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
  91       return 1;
  92    case PIPE_CAP_TEXTURE_SHADOW_MAP:
  93       return 1;
  94    case PIPE_CAP_TEXTURE_SWIZZLE:
  95       return 1;
  96    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
  97       return 0;
  98    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
  99       return SP_MAX_TEXTURE_2D_LEVELS;
 100    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
 101       return SP_MAX_TEXTURE_3D_LEVELS;
 102    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
 103       return SP_MAX_TEXTURE_CUBE_LEVELS;
 104    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
 105       return 1;
 106    case PIPE_CAP_INDEP_BLEND_ENABLE:
 107       return 1;
 108    case PIPE_CAP_INDEP_BLEND_FUNC:
 109       return 1;
 110    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
 111    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
 112    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
 113    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
 114       return 1;
 115    case PIPE_CAP_DEPTH_CLIP_DISABLE:
 116       return 1;
 117    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 118       return PIPE_MAX_SO_BUFFERS;
 119    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 120    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 121       return 16*4;
 122    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 123    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 124       return 1024;
 125    case PIPE_CAP_MAX_VERTEX_STREAMS:
 126       return 1;
 127    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 128       return 2048;
 129    case PIPE_CAP_PRIMITIVE_RESTART:
 130       return 1;
 131    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 132       return 1;
 133    case PIPE_CAP_TGSI_INSTANCEID:
 134    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 135    case PIPE_CAP_START_INSTANCE:
 136       return 1;
 137    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 138    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 139       return 1;
 140    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 141       return 256; /* for GL3 */
 142    case PIPE_CAP_MIN_TEXEL_OFFSET:
 143       return -8;
 144    case PIPE_CAP_MAX_TEXEL_OFFSET:
 145       return 7;
 146    case PIPE_CAP_CONDITIONAL_RENDER:
 147       return 1;
 148    case PIPE_CAP_TEXTURE_BARRIER:
 149       return 0;
 150    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 151    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED: /* draw module */
 152    case PIPE_CAP_VERTEX_COLOR_CLAMPED: /* draw module */
 153       return 1;
 154    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 155       return 0;
 156    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 157       return 330;
 158    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 159       return 0;
 160    case PIPE_CAP_COMPUTE:
 161       return 1;
 162    case PIPE_CAP_USER_VERTEX_BUFFERS:
 163    case PIPE_CAP_USER_INDEX_BUFFERS:
 164    case PIPE_CAP_USER_CONSTANT_BUFFERS:
 165    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 166    case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
 167    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 168       return 1;
 169    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 170       return 16;
 171    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 172    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 173    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 174    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 175    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 176       return 0;
 177    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 178       return 64;
 179    case PIPE_CAP_QUERY_TIMESTAMP:
 180    case PIPE_CAP_CUBE_MAP_ARRAY:
 181       return 1;
 182    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 183       return 1;
 184    case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
 185       return 0;
 186    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 187       return 65536;
 188    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 189       return 0;
 190    case PIPE_CAP_TGSI_TEXCOORD:
 191    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 192       return 0;
 193    case PIPE_CAP_MAX_VIEWPORTS:
 194       return PIPE_MAX_VIEWPORTS;
 195    case PIPE_CAP_ENDIANNESS:
 196       return PIPE_ENDIAN_NATIVE;
 197    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 198       return 4;
 199    case PIPE_CAP_TEXTURE_GATHER_SM5:
 200    case PIPE_CAP_TEXTURE_QUERY_LOD:
 201       return 1;
 202    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 203    case PIPE_CAP_SAMPLE_SHADING:
 204    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 205       return 0;
 206    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 207       return 1;
 208    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 209       return 0;
 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
 221    case PIPE_CAP_VENDOR_ID:
 222       return 0xFFFFFFFF;
 223    case PIPE_CAP_DEVICE_ID:
 224       return 0xFFFFFFFF;
 225    case PIPE_CAP_ACCELERATED:
 226       return 0;
 227    case PIPE_CAP_VIDEO_MEMORY: {
 228       /* XXX: Do we want to return the full amount fo system memory ? */
 229       uint64_t system_memory;
 230
 231       if (!os_get_total_physical_memory(&system_memory))
 232          return 0;
 233
 234       if (sizeof(void *) == 4)
 235          /* Cap to 2 GB on 32 bits system. We do this because softpipe does
 236           * eat application memory, which is quite limited on 32 bits. App
 237           * shouldn't expect too much available memory. */
 238          system_memory = MIN2(system_memory, 2048 << 20);
 239
 240       return (int)(system_memory >> 20);
 241    }
 242    case PIPE_CAP_UMA:
 243       return 0;
 244    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 245       return 1;
 246    case PIPE_CAP_CLIP_HALFZ:
 247    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 248    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 249       return 1;
 250    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 251    case PIPE_CAP_CULL_DISTANCE:
 252       return 1;
 253    case PIPE_CAP_VERTEXID_NOBASE:
 254       return 0;
 255    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 256       return 0;
 257    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 258    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 259       return 1;
 260    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 261    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 262    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 263    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 264    case PIPE_CAP_DEPTH_BOUNDS_TEST:
 265    case PIPE_CAP_TGSI_TXQS:
 266    case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
 267    case PIPE_CAP_SHAREABLE_SHADERS:
 268    case PIPE_CAP_CLEAR_TEXTURE:
 269    case PIPE_CAP_DRAW_PARAMETERS:
 270    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
 271    case PIPE_CAP_MULTI_DRAW_INDIRECT:
 272    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 273    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 274    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 275    case PIPE_CAP_INVALIDATE_BUFFER:
 276    case PIPE_CAP_GENERATE_MIPMAP:
 277    case PIPE_CAP_STRING_MARKER:
 278    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 279    case PIPE_CAP_QUERY_BUFFER_OBJECT:
 280    case PIPE_CAP_QUERY_MEMORY_INFO:
 281    case PIPE_CAP_PCI_GROUP:
 282    case PIPE_CAP_PCI_BUS:
 283    case PIPE_CAP_PCI_DEVICE:
 284    case PIPE_CAP_PCI_FUNCTION:
 285    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 286    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 287    case PIPE_CAP_TGSI_VOTE:
 288    case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 289    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
 290    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
 291       return 0;
 292    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 293       return 4;
 294    }
 295    /* should only get here on unhandled cases */
 296    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 297    return 0;
 298 }
 299
 300 static int
 301 softpipe_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 302 {
 303    struct softpipe_screen *sp_screen = softpipe_screen(screen);
 304    switch(shader)
 305    {
 306    case PIPE_SHADER_FRAGMENT:
 307       return tgsi_exec_get_shader_param(param);
 308    case PIPE_SHADER_COMPUTE:
 309       return tgsi_exec_get_shader_param(param);
 310    case PIPE_SHADER_VERTEX:
 311    case PIPE_SHADER_GEOMETRY:
 312       if (sp_screen->use_llvm)
 313          return draw_get_shader_param(shader, param);
 314       else
 315          return draw_get_shader_param_no_llvm(shader, param);
 316    default:
 317       return 0;
 318    }
 319 }
 320
 321 static float
 322 softpipe_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 323 {
 324    switch (param) {
 325    case PIPE_CAPF_MAX_LINE_WIDTH:
 326       /* fall-through */
 327    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 328       return 255.0; /* arbitrary */
 329    case PIPE_CAPF_MAX_POINT_WIDTH:
 330       /* fall-through */
 331    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 332       return 255.0; /* arbitrary */
 333    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 334       return 16.0;
 335    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 336       return 16.0; /* arbitrary */
 337    case PIPE_CAPF_GUARD_BAND_LEFT:
 338    case PIPE_CAPF_GUARD_BAND_TOP:
 339    case PIPE_CAPF_GUARD_BAND_RIGHT:
 340    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 341       return 0.0;
 342    }
 343    /* should only get here on unhandled cases */
 344    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
 345    return 0.0;
 346 }
 347
 348 /**
 349  * Query format support for creating a texture, drawing surface, etc.
 350  * \param format  the format to test
 351  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 352  */
 353 static boolean
 354 softpipe_is_format_supported( struct pipe_screen *screen,
 355                               enum pipe_format format,
 356                               enum pipe_texture_target target,
 357                               unsigned sample_count,
 358                               unsigned bind)
 359 {
 360    struct sw_winsys *winsys = softpipe_screen(screen)->winsys;
 361    const struct util_format_description *format_desc;
 362
 363    assert(target == PIPE_BUFFER ||
 364           target == PIPE_TEXTURE_1D ||
 365           target == PIPE_TEXTURE_1D_ARRAY ||
 366           target == PIPE_TEXTURE_2D ||
 367           target == PIPE_TEXTURE_2D_ARRAY ||
 368           target == PIPE_TEXTURE_RECT ||
 369           target == PIPE_TEXTURE_3D ||
 370           target == PIPE_TEXTURE_CUBE ||
 371           target == PIPE_TEXTURE_CUBE_ARRAY);
 372
 373    format_desc = util_format_description(format);
 374    if (!format_desc)
 375       return FALSE;
 376
 377    if (sample_count > 1)
 378       return FALSE;
 379
 380    if (bind & (PIPE_BIND_DISPLAY_TARGET |
 381                PIPE_BIND_SCANOUT |
 382                PIPE_BIND_SHARED)) {
 383       if(!winsys->is_displaytarget_format_supported(winsys, bind, format))
 384          return FALSE;
 385    }
 386
 387    if (bind & PIPE_BIND_RENDER_TARGET) {
 388       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
 389          return FALSE;
 390
 391       /*
 392        * Although possible, it is unnatural to render into compressed or YUV
 393        * surfaces. So disable these here to avoid going into weird paths
 394        * inside the state trackers.
 395        */
 396       if (format_desc->block.width != 1 ||
 397           format_desc->block.height != 1)
 398          return FALSE;
 399    }
 400
 401    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 402       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 403          return FALSE;
 404    }
 405
 406    if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC ||
 407        format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC) {
 408       /* Software decoding is not hooked up. */
 409       return FALSE;
 410    }
 411
 412    if ((bind & (PIPE_BIND_RENDER_TARGET | PIPE_BIND_SAMPLER_VIEW)) &&
 413        ((bind & PIPE_BIND_DISPLAY_TARGET) == 0) &&
 414        target != PIPE_BUFFER) {
 415       const struct util_format_description *desc =
 416          util_format_description(format);
 417       if (desc->nr_channels == 3 && desc->is_array) {
 418          /* Don't support any 3-component formats for rendering/texturing
 419           * since we don't support the corresponding 8-bit 3 channel UNORM
 420           * formats.  This allows us to support GL_ARB_copy_image between
 421           * GL_RGB8 and GL_RGB8UI, for example.  Otherwise, we may be asked to
 422           * do a resource copy between PIPE_FORMAT_R8G8B8_UINT and
 423           * PIPE_FORMAT_R8G8B8X8_UNORM, for example, which will not work
 424           * (different bpp).
 425           */
 426          return FALSE;
 427       }
 428    }
 429
 430    if (format_desc->layout == UTIL_FORMAT_LAYOUT_ETC &&
 431        format != PIPE_FORMAT_ETC1_RGB8)
 432       return FALSE;
 433
 434    /*
 435     * All other operations (sampling, transfer, etc).
 436     */
 437
 438    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 439       return util_format_s3tc_enabled;
 440    }
 441
 442    /*
 443     * Everything else should be supported by u_format.
 444     */
 445    return TRUE;
 446 }
 447
 448
 449 static void
 450 softpipe_destroy_screen( struct pipe_screen *screen )
 451 {
 452    struct softpipe_screen *sp_screen = softpipe_screen(screen);
 453    struct sw_winsys *winsys = sp_screen->winsys;
 454
 455    if(winsys->destroy)
 456       winsys->destroy(winsys);
 457
 458    FREE(screen);
 459 }
 460
 461
 462 /* This is often overriden by the co-state tracker.
 463  */
 464 static void
 465 softpipe_flush_frontbuffer(struct pipe_screen *_screen,
 466                            struct pipe_resource *resource,
 467                            unsigned level, unsigned layer,
 468                            void *context_private,
 469                            struct pipe_box *sub_box)
 470 {
 471    struct softpipe_screen *screen = softpipe_screen(_screen);
 472    struct sw_winsys *winsys = screen->winsys;
 473    struct softpipe_resource *texture = softpipe_resource(resource);
 474
 475    assert(texture->dt);
 476    if (texture->dt)
 477       winsys->displaytarget_display(winsys, texture->dt, context_private, sub_box);
 478 }
 479
 480 static uint64_t
 481 softpipe_get_timestamp(struct pipe_screen *_screen)
 482 {
 483    return os_time_get_nano();
 484 }
 485
 486 static int
 487 softpipe_get_compute_param(struct pipe_screen *_screen,
 488                            enum pipe_shader_ir ir_type,
 489                            enum pipe_compute_cap param,
 490                            void *ret)
 491 {
 492    switch (param) {
 493    case PIPE_COMPUTE_CAP_IR_TARGET:
 494       return 0;
 495    case PIPE_COMPUTE_CAP_MAX_GRID_SIZE:
 496       if (ret) {
 497          uint64_t *grid_size = ret;
 498          grid_size[0] = 65535;
 499          grid_size[1] = 65535;
 500          grid_size[2] = 65535;
 501       }
 502       return 3 * sizeof(uint64_t) ;
 503    case PIPE_COMPUTE_CAP_MAX_BLOCK_SIZE:
 504       if (ret) {
 505          uint64_t *block_size = ret;
 506          block_size[0] = 1024;
 507          block_size[1] = 1024;
 508          block_size[2] = 1024;
 509       }
 510       return 3 * sizeof(uint64_t);
 511    case PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK:
 512       if (ret) {
 513          uint64_t *max_threads_per_block = ret;
 514          *max_threads_per_block = 1024;
 515       }
 516       return sizeof(uint64_t);
 517    case PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE:
 518       if (ret) {
 519          uint64_t *max_local_size = ret;
 520          *max_local_size = 32768;
 521       }
 522       return sizeof(uint64_t);
 523    case PIPE_COMPUTE_CAP_GRID_DIMENSION:
 524    case PIPE_COMPUTE_CAP_MAX_GLOBAL_SIZE:
 525    case PIPE_COMPUTE_CAP_MAX_PRIVATE_SIZE:
 526    case PIPE_COMPUTE_CAP_MAX_INPUT_SIZE:
 527    case PIPE_COMPUTE_CAP_MAX_MEM_ALLOC_SIZE:
 528    case PIPE_COMPUTE_CAP_MAX_CLOCK_FREQUENCY:
 529    case PIPE_COMPUTE_CAP_MAX_COMPUTE_UNITS:
 530    case PIPE_COMPUTE_CAP_IMAGES_SUPPORTED:
 531    case PIPE_COMPUTE_CAP_SUBGROUP_SIZE:
 532    case PIPE_COMPUTE_CAP_ADDRESS_BITS:
 533    case PIPE_COMPUTE_CAP_MAX_VARIABLE_THREADS_PER_BLOCK:
 534       break;
 535    }
 536    return 0;
 537 }
 538
 539 /**
 540  * Create a new pipe_screen object
 541  * Note: we're not presently subclassing pipe_screen (no softpipe_screen).
 542  */
 543 struct pipe_screen *
 544 softpipe_create_screen(struct sw_winsys *winsys)
 545 {
 546    struct softpipe_screen *screen = CALLOC_STRUCT(softpipe_screen);
 547
 548    if (!screen)
 549       return NULL;
 550
 551    screen->winsys = winsys;
 552
 553    screen->base.destroy = softpipe_destroy_screen;
 554
 555    screen->base.get_name = softpipe_get_name;
 556    screen->base.get_vendor = softpipe_get_vendor;
 557    screen->base.get_device_vendor = softpipe_get_vendor; // TODO should be the CPU vendor
 558    screen->base.get_param = softpipe_get_param;
 559    screen->base.get_shader_param = softpipe_get_shader_param;
 560    screen->base.get_paramf = softpipe_get_paramf;
 561    screen->base.get_timestamp = softpipe_get_timestamp;
 562    screen->base.is_format_supported = softpipe_is_format_supported;
 563    screen->base.context_create = softpipe_create_context;
 564    screen->base.flush_frontbuffer = softpipe_flush_frontbuffer;
 565    screen->base.get_compute_param = softpipe_get_compute_param;
 566    screen->use_llvm = debug_get_option_use_llvm();
 567
 568    util_format_s3tc_init();
 569
 570    softpipe_init_screen_texture_funcs(&screen->base);
 571    softpipe_init_screen_fence_funcs(&screen->base);
 572
 573    return &screen->base;
 574 }