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       return 1;
 188    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 189       return 0;
 190    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 191       return 1024;
 192    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 193       return 16384;
 194    case PIPE_CAP_TEXTURE_QUERY_LOD:
 195       return vscreen->caps.caps.v1.bset.texture_query_lod;
 196    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 197       return vscreen->caps.caps.v1.max_texture_gather_components;
 198    case PIPE_CAP_TEXTURE_GATHER_SM5:
 199    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 200    case PIPE_CAP_SAMPLE_SHADING:
 201    case PIPE_CAP_FAKE_SW_MSAA:
 202    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 203    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 204    case PIPE_CAP_MAX_VERTEX_STREAMS:
 205    case PIPE_CAP_DRAW_INDIRECT:
 206    case PIPE_CAP_MULTI_DRAW_INDIRECT:
 207    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 208    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 209    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 210    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 211    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 212    case PIPE_CAP_CLIP_HALFZ:
 213    case PIPE_CAP_VERTEXID_NOBASE:
 214    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 215    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 216    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 217    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 218    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 219    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 220    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 221    case PIPE_CAP_DEPTH_BOUNDS_TEST:
 222    case PIPE_CAP_TGSI_TXQS:
 223    case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
 224    case PIPE_CAP_SHAREABLE_SHADERS:
 225    case PIPE_CAP_CLEAR_TEXTURE:
 226    case PIPE_CAP_DRAW_PARAMETERS:
 227    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
 228    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 229    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 230    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 231    case PIPE_CAP_INVALIDATE_BUFFER:
 232    case PIPE_CAP_GENERATE_MIPMAP:
 233    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 234    case PIPE_CAP_QUERY_BUFFER_OBJECT:
 235    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 236    case PIPE_CAP_STRING_MARKER:
 237    case PIPE_CAP_QUERY_MEMORY_INFO:
 238    case PIPE_CAP_PCI_GROUP:
 239    case PIPE_CAP_PCI_BUS:
 240    case PIPE_CAP_PCI_DEVICE:
 241    case PIPE_CAP_PCI_FUNCTION:
 242    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 243    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 244    case PIPE_CAP_CULL_DISTANCE:
 245    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 246    case PIPE_CAP_TGSI_VOTE:
 247    case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 248       return 0;
 249    case PIPE_CAP_VENDOR_ID:
 250       return 0x1af4;
 251    case PIPE_CAP_DEVICE_ID:
 252       return 0x1010;
 253    case PIPE_CAP_ACCELERATED:
 254       return 1;
 255    case PIPE_CAP_UMA:
 256    case PIPE_CAP_VIDEO_MEMORY:
 257       return 0;
 258    }
 259    /* should only get here on unhandled cases */
 260    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 261    return 0;
 262 }
 263
 264 static int
 265 virgl_get_shader_param(struct pipe_screen *screen, unsigned shader, enum pipe_shader_cap param)
 266 {
 267    struct virgl_screen *vscreen = virgl_screen(screen);
 268    switch(shader)
 269    {
 270    case PIPE_SHADER_FRAGMENT:
 271    case PIPE_SHADER_VERTEX:
 272    case PIPE_SHADER_GEOMETRY:
 273       switch (param) {
 274       case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 275       case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 276       case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 277       case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 278          return INT_MAX;
 279       case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 280       case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 281       case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 282          return 1;
 283       case PIPE_SHADER_CAP_MAX_INPUTS:
 284          if (vscreen->caps.caps.v1.glsl_level < 150)
 285             return 16;
 286          return shader == PIPE_SHADER_VERTEX ? 16 : 32;
 287       case PIPE_SHADER_CAP_MAX_OUTPUTS:
 288          return 128;
 289      // case PIPE_SHADER_CAP_MAX_CONSTS:
 290      //    return 4096;
 291       case PIPE_SHADER_CAP_MAX_TEMPS:
 292          return 256;
 293       case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 294          return vscreen->caps.caps.v1.max_uniform_blocks;
 295     //  case PIPE_SHADER_CAP_MAX_ADDRS:
 296      //    return 1;
 297       case PIPE_SHADER_CAP_MAX_PREDS:
 298          return 0;
 299       case PIPE_SHADER_CAP_SUBROUTINES:
 300          return 1;
 301       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 302             return 16;
 303       case PIPE_SHADER_CAP_INTEGERS:
 304          return vscreen->caps.caps.v1.glsl_level >= 130;
 305       case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 306          return 32;
 307       case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
 308          return 4096 * sizeof(float[4]);
 309       default:
 310          return 0;
 311       }
 312    default:
 313       return 0;
 314    }
 315 }
 316
 317 static float
 318 virgl_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;
 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_CAPF %d query\n", param);
 341    return 0.0;
 342 }
 343
 344 static boolean
 345 virgl_is_vertex_format_supported(struct pipe_screen *screen,
 346                                  enum pipe_format format)
 347 {
 348    struct virgl_screen *vscreen = virgl_screen(screen);
 349    const struct util_format_description *format_desc;
 350    int i;
 351
 352    format_desc = util_format_description(format);
 353    if (!format_desc)
 354       return FALSE;
 355
 356    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 357       int vformat = VIRGL_FORMAT_R11G11B10_FLOAT;
 358       int big = vformat / 32;
 359       int small = vformat % 32;
 360       if (!(vscreen->caps.caps.v1.vertexbuffer.bitmask[big] & (1 << small)))
 361          return FALSE;
 362       return TRUE;
 363    }
 364
 365    /* Find the first non-VOID channel. */
 366    for (i = 0; i < 4; i++) {
 367       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 368          break;
 369       }
 370    }
 371
 372    if (i == 4)
 373       return FALSE;
 374
 375    if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 376       return FALSE;
 377
 378    if (format_desc->channel[i].type == UTIL_FORMAT_TYPE_FIXED)
 379       return FALSE;
 380    return TRUE;
 381 }
 382
 383 /**
 384  * Query format support for creating a texture, drawing surface, etc.
 385  * \param format  the format to test
 386  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 387  */
 388 static boolean
 389 virgl_is_format_supported( struct pipe_screen *screen,
 390                                  enum pipe_format format,
 391                                  enum pipe_texture_target target,
 392                                  unsigned sample_count,
 393                                  unsigned bind)
 394 {
 395    struct virgl_screen *vscreen = virgl_screen(screen);
 396    const struct util_format_description *format_desc;
 397    int i;
 398
 399    assert(target == PIPE_BUFFER ||
 400           target == PIPE_TEXTURE_1D ||
 401           target == PIPE_TEXTURE_1D_ARRAY ||
 402           target == PIPE_TEXTURE_2D ||
 403           target == PIPE_TEXTURE_2D_ARRAY ||
 404           target == PIPE_TEXTURE_RECT ||
 405           target == PIPE_TEXTURE_3D ||
 406           target == PIPE_TEXTURE_CUBE ||
 407           target == PIPE_TEXTURE_CUBE_ARRAY);
 408
 409    format_desc = util_format_description(format);
 410    if (!format_desc)
 411       return FALSE;
 412
 413    if (util_format_is_intensity(format))
 414       return FALSE;
 415
 416    if (sample_count > 1) {
 417       if (!vscreen->caps.caps.v1.bset.texture_multisample)
 418          return FALSE;
 419       if (sample_count > vscreen->caps.caps.v1.max_samples)
 420          return FALSE;
 421    }
 422
 423    if (bind & PIPE_BIND_VERTEX_BUFFER) {
 424       return virgl_is_vertex_format_supported(screen, format);
 425    }
 426
 427    if (bind & PIPE_BIND_RENDER_TARGET) {
 428       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
 429          return FALSE;
 430
 431       /*
 432        * Although possible, it is unnatural to render into compressed or YUV
 433        * surfaces. So disable these here to avoid going into weird paths
 434        * inside the state trackers.
 435        */
 436       if (format_desc->block.width != 1 ||
 437           format_desc->block.height != 1)
 438          return FALSE;
 439
 440       {
 441          int big = format / 32;
 442          int small = format % 32;
 443          if (!(vscreen->caps.caps.v1.render.bitmask[big] & (1 << small)))
 444             return FALSE;
 445       }
 446    }
 447
 448    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 449       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 450          return FALSE;
 451    }
 452
 453    /*
 454     * All other operations (sampling, transfer, etc).
 455     */
 456
 457    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 458       if (util_format_s3tc_enabled)
 459          goto out_lookup;
 460       return FALSE;
 461    }
 462    if (format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC) {
 463       goto out_lookup;
 464    }
 465
 466    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 467       goto out_lookup;
 468    } else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
 469       goto out_lookup;
 470    }
 471
 472    /* Find the first non-VOID channel. */
 473    for (i = 0; i < 4; i++) {
 474       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 475          break;
 476       }
 477    }
 478
 479    if (i == 4)
 480       return FALSE;
 481
 482    /* no L4A4 */
 483    if (format_desc->nr_channels < 4 && format_desc->channel[i].size == 4)
 484       return FALSE;
 485
 486  out_lookup:
 487    {
 488       int big = format / 32;
 489       int small = format % 32;
 490       if (!(vscreen->caps.caps.v1.sampler.bitmask[big] & (1 << small)))
 491          return FALSE;
 492    }
 493    /*
 494     * Everything else should be supported by u_format.
 495     */
 496    return TRUE;
 497 }
 498
 499 static void virgl_flush_frontbuffer(struct pipe_screen *screen,
 500                                       struct pipe_resource *res,
 501                                       unsigned level, unsigned layer,
 502                                     void *winsys_drawable_handle, struct pipe_box *sub_box)
 503 {
 504    struct virgl_screen *vscreen = virgl_screen(screen);
 505    struct virgl_winsys *vws = vscreen->vws;
 506    struct virgl_resource *vres = virgl_resource(res);
 507
 508    if (vws->flush_frontbuffer)
 509       vws->flush_frontbuffer(vws, vres->hw_res, level, layer, winsys_drawable_handle,
 510                              sub_box);
 511 }
 512
 513 static void virgl_fence_reference(struct pipe_screen *screen,
 514                                   struct pipe_fence_handle **ptr,
 515                                   struct pipe_fence_handle *fence)
 516 {
 517    struct virgl_screen *vscreen = virgl_screen(screen);
 518    struct virgl_winsys *vws = vscreen->vws;
 519
 520    vws->fence_reference(vws, ptr, fence);
 521 }
 522
 523 static boolean virgl_fence_finish(struct pipe_screen *screen,
 524                                   struct pipe_fence_handle *fence,
 525                                   uint64_t timeout)
 526 {
 527    struct virgl_screen *vscreen = virgl_screen(screen);
 528    struct virgl_winsys *vws = vscreen->vws;
 529
 530    return vws->fence_wait(vws, fence, timeout);
 531 }
 532
 533 static uint64_t
 534 virgl_get_timestamp(struct pipe_screen *_screen)
 535 {
 536    return os_time_get_nano();
 537 }
 538
 539 static void
 540 virgl_destroy_screen(struct pipe_screen *screen)
 541 {
 542    struct virgl_screen *vscreen = virgl_screen(screen);
 543    struct virgl_winsys *vws = vscreen->vws;
 544
 545    if (vws)
 546       vws->destroy(vws);
 547    FREE(vscreen);
 548 }
 549
 550 struct pipe_screen *
 551 virgl_create_screen(struct virgl_winsys *vws)
 552 {
 553    struct virgl_screen *screen = CALLOC_STRUCT(virgl_screen);
 554
 555    if (!screen)
 556       return NULL;
 557
 558    screen->vws = vws;
 559    screen->base.get_name = virgl_get_name;
 560    screen->base.get_vendor = virgl_get_vendor;
 561    screen->base.get_param = virgl_get_param;
 562    screen->base.get_shader_param = virgl_get_shader_param;
 563    screen->base.get_paramf = virgl_get_paramf;
 564    screen->base.is_format_supported = virgl_is_format_supported;
 565    screen->base.destroy = virgl_destroy_screen;
 566    screen->base.context_create = virgl_context_create;
 567    screen->base.flush_frontbuffer = virgl_flush_frontbuffer;
 568    screen->base.get_timestamp = virgl_get_timestamp;
 569    screen->base.fence_reference = virgl_fence_reference;
 570    //screen->base.fence_signalled = virgl_fence_signalled;
 571    screen->base.fence_finish = virgl_fence_finish;
 572
 573    virgl_init_screen_resource_functions(&screen->base);
 574
 575    vws->get_caps(vws, &screen->caps);
 576
 577    screen->refcnt = 1;
 578
 579    util_format_s3tc_init();
 580    return &screen->base;
 581 }