src/gallium/drivers/virgl/virgl_screen.c

   1 /*
   2  * Copyright 2014, 2015 Red Hat.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * on the rights to use, copy, modify, merge, publish, distribute, sub
   8  * license, and/or sell copies of the Software, and to permit persons to whom
   9  * the Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  18  * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  19  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  20  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  21  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  22  */
  23 #include "util/u_memory.h"
  24 #include "util/u_format.h"
  25 #include "util/u_format_s3tc.h"
  26 #include "util/u_video.h"
  27 #include "os/os_time.h"
  28 #include "pipe/p_defines.h"
  29 #include "pipe/p_screen.h"
  30 #include "draw/draw_context.h"
  31
  32 #include "tgsi/tgsi_exec.h"
  33
  34 #include "virgl_screen.h"
  35 #include "virgl_resource.h"
  36 #include "virgl_public.h"
  37 #include "virgl_context.h"
  38
  39 #define SP_MAX_TEXTURE_2D_LEVELS 15  /* 16K x 16K */
  40 #define SP_MAX_TEXTURE_3D_LEVELS 9   /* 512 x 512 x 512 */
  41 #define SP_MAX_TEXTURE_CUBE_LEVELS 13  /* 4K x 4K */
  42
  43 static const char *
  44 virgl_get_vendor(struct pipe_screen *screen)
  45 {
  46    return "Red Hat";
  47 }
  48
  49
  50 static const char *
  51 virgl_get_name(struct pipe_screen *screen)
  52 {
  53    return "virgl";
  54 }
  55
  56 static int
  57 virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
  58 {
  59    struct virgl_screen *vscreen = virgl_screen(screen);
  60    switch (param) {
  61    case PIPE_CAP_NPOT_TEXTURES:
  62       return 1;
  63    case PIPE_CAP_TWO_SIDED_STENCIL:
  64       return 1;
  65    case PIPE_CAP_SM3:
  66       return 1;
  67    case PIPE_CAP_ANISOTROPIC_FILTER:
  68       return 1;
  69    case PIPE_CAP_POINT_SPRITE:
  70       return 1;
  71    case PIPE_CAP_MAX_RENDER_TARGETS:
  72       return vscreen->caps.caps.v1.max_render_targets;
  73    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
  74       return vscreen->caps.caps.v1.max_dual_source_render_targets;
  75    case PIPE_CAP_OCCLUSION_QUERY:
  76       return vscreen->caps.caps.v1.bset.occlusion_query;
  77    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
  78       return vscreen->caps.caps.v1.bset.mirror_clamp;
  79    case PIPE_CAP_TEXTURE_SHADOW_MAP:
  80       return 1;
  81    case PIPE_CAP_TEXTURE_SWIZZLE:
  82       return 1;
  83    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
  84       return SP_MAX_TEXTURE_2D_LEVELS;
  85    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
  86       return SP_MAX_TEXTURE_3D_LEVELS;
  87    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
  88       return SP_MAX_TEXTURE_CUBE_LEVELS;
  89    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
  90       return 1;
  91    case PIPE_CAP_INDEP_BLEND_ENABLE:
  92       return vscreen->caps.caps.v1.bset.indep_blend_enable;
  93    case PIPE_CAP_INDEP_BLEND_FUNC:
  94       return vscreen->caps.caps.v1.bset.indep_blend_func;
  95    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
  96    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
  97    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
  98    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
  99       return vscreen->caps.caps.v1.bset.fragment_coord_conventions;
 100    case PIPE_CAP_DEPTH_CLIP_DISABLE:
 101       return vscreen->caps.caps.v1.bset.depth_clip_disable;
 102    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
 103       return vscreen->caps.caps.v1.max_streamout_buffers;
 104    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 105    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 106       return 16*4;
 107    case PIPE_CAP_PRIMITIVE_RESTART:
 108       return vscreen->caps.caps.v1.bset.primitive_restart;
 109    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 110       return vscreen->caps.caps.v1.bset.shader_stencil_export;
 111    case PIPE_CAP_TGSI_INSTANCEID:
 112    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 113       return 1;
 114    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 115       return vscreen->caps.caps.v1.bset.seamless_cube_map;
 116    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 117       return vscreen->caps.caps.v1.bset.seamless_cube_map_per_texture;
 118    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 119       return vscreen->caps.caps.v1.max_texture_array_layers;
 120    case PIPE_CAP_MIN_TEXEL_OFFSET:
 121    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 122       return -8;
 123    case PIPE_CAP_MAX_TEXEL_OFFSET:
 124    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 125       return 7;
 126    case PIPE_CAP_CONDITIONAL_RENDER:
 127       return vscreen->caps.caps.v1.bset.conditional_render;
 128    case PIPE_CAP_TEXTURE_BARRIER:
 129       return 0;
 130    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 131       return 1;
 132    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 133    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 134       return vscreen->caps.caps.v1.bset.color_clamping;
 135    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 136       return 1;
 137    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 138       return vscreen->caps.caps.v1.glsl_level;
 139    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 140       return 0;
 141    case PIPE_CAP_COMPUTE:
 142       return 0;
 143    case PIPE_CAP_USER_VERTEX_BUFFERS:
 144       return 0;
 145    case PIPE_CAP_USER_INDEX_BUFFERS:
 146    case PIPE_CAP_USER_CONSTANT_BUFFERS:
 147       return 1;
 148    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 149       return 16;
 150    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 151       return vscreen->caps.caps.v1.bset.streamout_pause_resume;
 152    case PIPE_CAP_START_INSTANCE:
 153       return vscreen->caps.caps.v1.bset.start_instance;
 154    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 155    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 156    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 157    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 158    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 159       return 0;
 160    case PIPE_CAP_QUERY_TIMESTAMP:
 161       return 1;
 162    case PIPE_CAP_QUERY_TIME_ELAPSED:
 163       return 0;
 164    case PIPE_CAP_TGSI_TEXCOORD:
 165       return 0;
 166    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 167       return VIRGL_MAP_BUFFER_ALIGNMENT;
 168    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 169       return vscreen->caps.caps.v1.max_tbo_size > 0;
 170    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 171       return 0;
 172    case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
 173       return 0;
 174    case PIPE_CAP_CUBE_MAP_ARRAY:
 175       return vscreen->caps.caps.v1.bset.cube_map_array;
 176    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 177       return vscreen->caps.caps.v1.bset.texture_multisample;
 178    case PIPE_CAP_MAX_VIEWPORTS:
 179       return vscreen->caps.caps.v1.max_viewports;
 180    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 181       return vscreen->caps.caps.v1.max_tbo_size;
 182    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
 183    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 184    case PIPE_CAP_ENDIANNESS:
 185       return 0;
 186    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
 187    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 188       return 1;
 189    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 190       return 0;
 191    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 192       return 256;
 193    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 194       return 16384;
 195    case PIPE_CAP_TEXTURE_QUERY_LOD:
 196       return vscreen->caps.caps.v1.bset.texture_query_lod;
 197    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 198       return vscreen->caps.caps.v1.max_texture_gather_components;
 199    case PIPE_CAP_TEXTURE_GATHER_SM5:
 200    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 201    case PIPE_CAP_SAMPLE_SHADING:
 202    case PIPE_CAP_FAKE_SW_MSAA:
 203    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 204    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 205    case PIPE_CAP_MAX_VERTEX_STREAMS:
 206    case PIPE_CAP_DRAW_INDIRECT:
 207    case PIPE_CAP_MULTI_DRAW_INDIRECT:
 208    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 209    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 210    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 211    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 212    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 213    case PIPE_CAP_CLIP_HALFZ:
 214    case PIPE_CAP_VERTEXID_NOBASE:
 215    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 216    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 217    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 218    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 219    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 220    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 221    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 222    case PIPE_CAP_DEPTH_BOUNDS_TEST:
 223    case PIPE_CAP_TGSI_TXQS:
 224    case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
 225    case PIPE_CAP_SHAREABLE_SHADERS:
 226    case PIPE_CAP_CLEAR_TEXTURE:
 227    case PIPE_CAP_DRAW_PARAMETERS:
 228    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
 229    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 230    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 231    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 232    case PIPE_CAP_INVALIDATE_BUFFER:
 233    case PIPE_CAP_GENERATE_MIPMAP:
 234    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 235    case PIPE_CAP_QUERY_BUFFER_OBJECT:
 236    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 237    case PIPE_CAP_STRING_MARKER:
 238    case PIPE_CAP_QUERY_MEMORY_INFO:
 239    case PIPE_CAP_PCI_GROUP:
 240    case PIPE_CAP_PCI_BUS:
 241    case PIPE_CAP_PCI_DEVICE:
 242    case PIPE_CAP_PCI_FUNCTION:
 243    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 244    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 245    case PIPE_CAP_CULL_DISTANCE:
 246    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 247    case PIPE_CAP_TGSI_VOTE:
 248    case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 249    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
 250    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
 251    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 252       return 0;
 253    case PIPE_CAP_VENDOR_ID:
 254       return 0x1af4;
 255    case PIPE_CAP_DEVICE_ID:
 256       return 0x1010;
 257    case PIPE_CAP_ACCELERATED:
 258       return 1;
 259    case PIPE_CAP_UMA:
 260    case PIPE_CAP_VIDEO_MEMORY:
 261       return 0;
 262    }
 263    /* should only get here on unhandled cases */
 264    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 265    return 0;
 266 }
 267
 268 static int
 269 virgl_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 270 {
 271    struct virgl_screen *vscreen = virgl_screen(screen);
 272    switch(shader)
 273    {
 274    case PIPE_SHADER_FRAGMENT:
 275    case PIPE_SHADER_VERTEX:
 276    case PIPE_SHADER_GEOMETRY:
 277       switch (param) {
 278       case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 279       case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 280       case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 281       case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 282          return INT_MAX;
 283       case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 284       case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 285       case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 286          return 1;
 287       case PIPE_SHADER_CAP_MAX_INPUTS:
 288          if (vscreen->caps.caps.v1.glsl_level < 150)
 289             return 16;
 290          return (shader == PIPE_SHADER_VERTEX ||
 291                  shader == PIPE_SHADER_GEOMETRY) ? 16 : 32;
 292       case PIPE_SHADER_CAP_MAX_OUTPUTS:
 293          return 32;
 294      // case PIPE_SHADER_CAP_MAX_CONSTS:
 295      //    return 4096;
 296       case PIPE_SHADER_CAP_MAX_TEMPS:
 297          return 256;
 298       case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 299          return vscreen->caps.caps.v1.max_uniform_blocks;
 300     //  case PIPE_SHADER_CAP_MAX_ADDRS:
 301      //    return 1;
 302       case PIPE_SHADER_CAP_MAX_PREDS:
 303          return 0;
 304       case PIPE_SHADER_CAP_SUBROUTINES:
 305          return 1;
 306       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 307             return 16;
 308       case PIPE_SHADER_CAP_INTEGERS:
 309          return vscreen->caps.caps.v1.glsl_level >= 130;
 310       case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 311          return 32;
 312       case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
 313          return 4096 * sizeof(float[4]);
 314       default:
 315          return 0;
 316       }
 317    default:
 318       return 0;
 319    }
 320 }
 321
 322 static float
 323 virgl_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 324 {
 325    switch (param) {
 326    case PIPE_CAPF_MAX_LINE_WIDTH:
 327       /* fall-through */
 328    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 329       return 255.0; /* arbitrary */
 330    case PIPE_CAPF_MAX_POINT_WIDTH:
 331       /* fall-through */
 332    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 333       return 255.0; /* arbitrary */
 334    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 335       return 16.0;
 336    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 337       return 16.0; /* arbitrary */
 338    case PIPE_CAPF_GUARD_BAND_LEFT:
 339    case PIPE_CAPF_GUARD_BAND_TOP:
 340    case PIPE_CAPF_GUARD_BAND_RIGHT:
 341    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 342       return 0.0;
 343    }
 344    /* should only get here on unhandled cases */
 345    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
 346    return 0.0;
 347 }
 348
 349 static boolean
 350 virgl_is_vertex_format_supported(struct pipe_screen *screen,
 351                                  enum pipe_format format)
 352 {
 353    struct virgl_screen *vscreen = virgl_screen(screen);
 354    const struct util_format_description *format_desc;
 355    int i;
 356
 357    format_desc = util_format_description(format);
 358    if (!format_desc)
 359       return FALSE;
 360
 361    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 362       int vformat = VIRGL_FORMAT_R11G11B10_FLOAT;
 363       int big = vformat / 32;
 364       int small = vformat % 32;
 365       if (!(vscreen->caps.caps.v1.vertexbuffer.bitmask[big] & (1 << small)))
 366          return FALSE;
 367       return TRUE;
 368    }
 369
 370    /* Find the first non-VOID channel. */
 371    for (i = 0; i < 4; i++) {
 372       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 373          break;
 374       }
 375    }
 376
 377    if (i == 4)
 378       return FALSE;
 379
 380    if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 381       return FALSE;
 382
 383    if (format_desc->channel[i].type == UTIL_FORMAT_TYPE_FIXED)
 384       return FALSE;
 385    return TRUE;
 386 }
 387
 388 /**
 389  * Query format support for creating a texture, drawing surface, etc.
 390  * \param format  the format to test
 391  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 392  */
 393 static boolean
 394 virgl_is_format_supported( struct pipe_screen *screen,
 395                                  enum pipe_format format,
 396                                  enum pipe_texture_target target,
 397                                  unsigned sample_count,
 398                                  unsigned bind)
 399 {
 400    struct virgl_screen *vscreen = virgl_screen(screen);
 401    const struct util_format_description *format_desc;
 402    int i;
 403
 404    assert(target == PIPE_BUFFER ||
 405           target == PIPE_TEXTURE_1D ||
 406           target == PIPE_TEXTURE_1D_ARRAY ||
 407           target == PIPE_TEXTURE_2D ||
 408           target == PIPE_TEXTURE_2D_ARRAY ||
 409           target == PIPE_TEXTURE_RECT ||
 410           target == PIPE_TEXTURE_3D ||
 411           target == PIPE_TEXTURE_CUBE ||
 412           target == PIPE_TEXTURE_CUBE_ARRAY);
 413
 414    format_desc = util_format_description(format);
 415    if (!format_desc)
 416       return FALSE;
 417
 418    if (util_format_is_intensity(format))
 419       return FALSE;
 420
 421    if (sample_count > 1) {
 422       if (!vscreen->caps.caps.v1.bset.texture_multisample)
 423          return FALSE;
 424       if (sample_count > vscreen->caps.caps.v1.max_samples)
 425          return FALSE;
 426    }
 427
 428    if (bind & PIPE_BIND_VERTEX_BUFFER) {
 429       return virgl_is_vertex_format_supported(screen, format);
 430    }
 431
 432    if (bind & PIPE_BIND_RENDER_TARGET) {
 433       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
 434          return FALSE;
 435
 436       /*
 437        * Although possible, it is unnatural to render into compressed or YUV
 438        * surfaces. So disable these here to avoid going into weird paths
 439        * inside the state trackers.
 440        */
 441       if (format_desc->block.width != 1 ||
 442           format_desc->block.height != 1)
 443          return FALSE;
 444
 445       {
 446          int big = format / 32;
 447          int small = format % 32;
 448          if (!(vscreen->caps.caps.v1.render.bitmask[big] & (1 << small)))
 449             return FALSE;
 450       }
 451    }
 452
 453    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 454       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 455          return FALSE;
 456    }
 457
 458    /*
 459     * All other operations (sampling, transfer, etc).
 460     */
 461
 462    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 463       if (util_format_s3tc_enabled)
 464          goto out_lookup;
 465       return FALSE;
 466    }
 467    if (format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC) {
 468       goto out_lookup;
 469    }
 470
 471    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 472       goto out_lookup;
 473    } else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
 474       goto out_lookup;
 475    }
 476
 477    /* Find the first non-VOID channel. */
 478    for (i = 0; i < 4; i++) {
 479       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 480          break;
 481       }
 482    }
 483
 484    if (i == 4)
 485       return FALSE;
 486
 487    /* no L4A4 */
 488    if (format_desc->nr_channels < 4 && format_desc->channel[i].size == 4)
 489       return FALSE;
 490
 491  out_lookup:
 492    {
 493       int big = format / 32;
 494       int small = format % 32;
 495       if (!(vscreen->caps.caps.v1.sampler.bitmask[big] & (1 << small)))
 496          return FALSE;
 497    }
 498    /*
 499     * Everything else should be supported by u_format.
 500     */
 501    return TRUE;
 502 }
 503
 504 static void virgl_flush_frontbuffer(struct pipe_screen *screen,
 505                                       struct pipe_resource *res,
 506                                       unsigned level, unsigned layer,
 507                                     void *winsys_drawable_handle, struct pipe_box *sub_box)
 508 {
 509    struct virgl_screen *vscreen = virgl_screen(screen);
 510    struct virgl_winsys *vws = vscreen->vws;
 511    struct virgl_resource *vres = virgl_resource(res);
 512
 513    if (vws->flush_frontbuffer)
 514       vws->flush_frontbuffer(vws, vres->hw_res, level, layer, winsys_drawable_handle,
 515                              sub_box);
 516 }
 517
 518 static void virgl_fence_reference(struct pipe_screen *screen,
 519                                   struct pipe_fence_handle **ptr,
 520                                   struct pipe_fence_handle *fence)
 521 {
 522    struct virgl_screen *vscreen = virgl_screen(screen);
 523    struct virgl_winsys *vws = vscreen->vws;
 524
 525    vws->fence_reference(vws, ptr, fence);
 526 }
 527
 528 static boolean virgl_fence_finish(struct pipe_screen *screen,
 529                                   struct pipe_context *ctx,
 530                                   struct pipe_fence_handle *fence,
 531                                   uint64_t timeout)
 532 {
 533    struct virgl_screen *vscreen = virgl_screen(screen);
 534    struct virgl_winsys *vws = vscreen->vws;
 535
 536    return vws->fence_wait(vws, fence, timeout);
 537 }
 538
 539 static uint64_t
 540 virgl_get_timestamp(struct pipe_screen *_screen)
 541 {
 542    return os_time_get_nano();
 543 }
 544
 545 static void
 546 virgl_destroy_screen(struct pipe_screen *screen)
 547 {
 548    struct virgl_screen *vscreen = virgl_screen(screen);
 549    struct virgl_winsys *vws = vscreen->vws;
 550
 551    slab_destroy_parent(&vscreen->texture_transfer_pool);
 552
 553    if (vws)
 554       vws->destroy(vws);
 555    FREE(vscreen);
 556 }
 557
 558 struct pipe_screen *
 559 virgl_create_screen(struct virgl_winsys *vws)
 560 {
 561    struct virgl_screen *screen = CALLOC_STRUCT(virgl_screen);
 562
 563    if (!screen)
 564       return NULL;
 565
 566    screen->vws = vws;
 567    screen->base.get_name = virgl_get_name;
 568    screen->base.get_vendor = virgl_get_vendor;
 569    screen->base.get_param = virgl_get_param;
 570    screen->base.get_shader_param = virgl_get_shader_param;
 571    screen->base.get_paramf = virgl_get_paramf;
 572    screen->base.is_format_supported = virgl_is_format_supported;
 573    screen->base.destroy = virgl_destroy_screen;
 574    screen->base.context_create = virgl_context_create;
 575    screen->base.flush_frontbuffer = virgl_flush_frontbuffer;
 576    screen->base.get_timestamp = virgl_get_timestamp;
 577    screen->base.fence_reference = virgl_fence_reference;
 578    //screen->base.fence_signalled = virgl_fence_signalled;
 579    screen->base.fence_finish = virgl_fence_finish;
 580
 581    virgl_init_screen_resource_functions(&screen->base);
 582
 583    vws->get_caps(vws, &screen->caps);
 584
 585    screen->refcnt = 1;
 586
 587    slab_create_parent(&screen->texture_transfer_pool, sizeof(struct virgl_transfer), 16);
 588
 589    util_format_s3tc_init();
 590    return &screen->base;
 591 }