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 "util/os_time.h"
  28 #include "pipe/p_defines.h"
  29 #include "pipe/p_screen.h"
  30
  31 #include "tgsi/tgsi_exec.h"
  32
  33 #include "virgl_screen.h"
  34 #include "virgl_resource.h"
  35 #include "virgl_public.h"
  36 #include "virgl_context.h"
  37
  38 #define SP_MAX_TEXTURE_2D_LEVELS 15  /* 16K x 16K */
  39 #define SP_MAX_TEXTURE_3D_LEVELS 9   /* 512 x 512 x 512 */
  40 #define SP_MAX_TEXTURE_CUBE_LEVELS 13  /* 4K x 4K */
  41
  42 static const char *
  43 virgl_get_vendor(struct pipe_screen *screen)
  44 {
  45    return "Red Hat";
  46 }
  47
  48
  49 static const char *
  50 virgl_get_name(struct pipe_screen *screen)
  51 {
  52    return "virgl";
  53 }
  54
  55 static int
  56 virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
  57 {
  58    struct virgl_screen *vscreen = virgl_screen(screen);
  59    switch (param) {
  60    case PIPE_CAP_NPOT_TEXTURES:
  61       return 1;
  62    case PIPE_CAP_SM3:
  63       return 1;
  64    case PIPE_CAP_ANISOTROPIC_FILTER:
  65       return 1;
  66    case PIPE_CAP_POINT_SPRITE:
  67       return 1;
  68    case PIPE_CAP_MAX_RENDER_TARGETS:
  69       return vscreen->caps.caps.v1.max_render_targets;
  70    case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
  71       return vscreen->caps.caps.v1.max_dual_source_render_targets;
  72    case PIPE_CAP_OCCLUSION_QUERY:
  73       return vscreen->caps.caps.v1.bset.occlusion_query;
  74    case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
  75       return vscreen->caps.caps.v1.bset.mirror_clamp;
  76    case PIPE_CAP_TEXTURE_SWIZZLE:
  77       return 1;
  78    case PIPE_CAP_MAX_TEXTURE_2D_LEVELS:
  79       return SP_MAX_TEXTURE_2D_LEVELS;
  80    case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
  81       return SP_MAX_TEXTURE_3D_LEVELS;
  82    case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
  83       return SP_MAX_TEXTURE_CUBE_LEVELS;
  84    case PIPE_CAP_BLEND_EQUATION_SEPARATE:
  85       return 1;
  86    case PIPE_CAP_INDEP_BLEND_ENABLE:
  87       return vscreen->caps.caps.v1.bset.indep_blend_enable;
  88    case PIPE_CAP_INDEP_BLEND_FUNC:
  89       return vscreen->caps.caps.v1.bset.indep_blend_func;
  90    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_UPPER_LEFT:
  91    case PIPE_CAP_TGSI_FS_COORD_ORIGIN_LOWER_LEFT:
  92    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
  93    case PIPE_CAP_TGSI_FS_COORD_PIXEL_CENTER_INTEGER:
  94       return vscreen->caps.caps.v1.bset.fragment_coord_conventions;
  95    case PIPE_CAP_DEPTH_CLIP_DISABLE:
  96       return vscreen->caps.caps.v1.bset.depth_clip_disable;
  97    case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
  98       return vscreen->caps.caps.v1.max_streamout_buffers;
  99    case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
 100    case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
 101       return 16*4;
 102    case PIPE_CAP_PRIMITIVE_RESTART:
 103       return vscreen->caps.caps.v1.bset.primitive_restart;
 104    case PIPE_CAP_SHADER_STENCIL_EXPORT:
 105       return vscreen->caps.caps.v1.bset.shader_stencil_export;
 106    case PIPE_CAP_TGSI_INSTANCEID:
 107    case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
 108       return 1;
 109    case PIPE_CAP_SEAMLESS_CUBE_MAP:
 110       return vscreen->caps.caps.v1.bset.seamless_cube_map;
 111    case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
 112       return vscreen->caps.caps.v1.bset.seamless_cube_map_per_texture;
 113    case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
 114       return vscreen->caps.caps.v1.max_texture_array_layers;
 115    case PIPE_CAP_MIN_TEXEL_OFFSET:
 116    case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
 117       return -8;
 118    case PIPE_CAP_MAX_TEXEL_OFFSET:
 119    case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
 120       return 7;
 121    case PIPE_CAP_CONDITIONAL_RENDER:
 122       return vscreen->caps.caps.v1.bset.conditional_render;
 123    case PIPE_CAP_TEXTURE_BARRIER:
 124       return 0;
 125    case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
 126       return 1;
 127    case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
 128    case PIPE_CAP_VERTEX_COLOR_CLAMPED:
 129       return vscreen->caps.caps.v1.bset.color_clamping;
 130    case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
 131       return 1;
 132    case PIPE_CAP_GLSL_FEATURE_LEVEL:
 133       return vscreen->caps.caps.v1.glsl_level;
 134    case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
 135       return 0;
 136    case PIPE_CAP_COMPUTE:
 137       return 0;
 138    case PIPE_CAP_USER_VERTEX_BUFFERS:
 139       return 0;
 140    case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
 141       return 16;
 142    case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
 143    case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
 144       return vscreen->caps.caps.v1.bset.streamout_pause_resume;
 145    case PIPE_CAP_START_INSTANCE:
 146       return vscreen->caps.caps.v1.bset.start_instance;
 147    case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
 148    case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
 149    case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
 150    case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
 151    case PIPE_CAP_PREFER_BLIT_BASED_TEXTURE_TRANSFER:
 152       return 0;
 153    case PIPE_CAP_QUERY_TIMESTAMP:
 154       return 1;
 155    case PIPE_CAP_QUERY_TIME_ELAPSED:
 156       return 0;
 157    case PIPE_CAP_TGSI_TEXCOORD:
 158       return 0;
 159    case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
 160       return VIRGL_MAP_BUFFER_ALIGNMENT;
 161    case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
 162       return vscreen->caps.caps.v1.max_tbo_size > 0;
 163    case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
 164       return 0;
 165    case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
 166       return 0;
 167    case PIPE_CAP_CUBE_MAP_ARRAY:
 168       return vscreen->caps.caps.v1.bset.cube_map_array;
 169    case PIPE_CAP_TEXTURE_MULTISAMPLE:
 170       return vscreen->caps.caps.v1.bset.texture_multisample;
 171    case PIPE_CAP_MAX_VIEWPORTS:
 172       return vscreen->caps.caps.v1.max_viewports;
 173    case PIPE_CAP_MAX_TEXTURE_BUFFER_SIZE:
 174       return vscreen->caps.caps.v1.max_tbo_size;
 175    case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
 176    case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
 177    case PIPE_CAP_ENDIANNESS:
 178       return 0;
 179    case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
 180    case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
 181       return 1;
 182    case PIPE_CAP_TGSI_VS_LAYER_VIEWPORT:
 183       return 0;
 184    case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
 185       return 256;
 186    case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
 187       return 16384;
 188    case PIPE_CAP_TEXTURE_QUERY_LOD:
 189       return vscreen->caps.caps.v1.bset.texture_query_lod;
 190    case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
 191       return vscreen->caps.caps.v1.max_texture_gather_components;
 192    case PIPE_CAP_TEXTURE_GATHER_SM5:
 193    case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
 194    case PIPE_CAP_SAMPLE_SHADING:
 195    case PIPE_CAP_FAKE_SW_MSAA:
 196    case PIPE_CAP_TEXTURE_GATHER_OFFSETS:
 197    case PIPE_CAP_TGSI_VS_WINDOW_SPACE_POSITION:
 198    case PIPE_CAP_MAX_VERTEX_STREAMS:
 199    case PIPE_CAP_DRAW_INDIRECT:
 200    case PIPE_CAP_MULTI_DRAW_INDIRECT:
 201    case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
 202    case PIPE_CAP_TGSI_FS_FINE_DERIVATIVE:
 203    case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
 204    case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
 205    case PIPE_CAP_SAMPLER_VIEW_TARGET:
 206    case PIPE_CAP_CLIP_HALFZ:
 207    case PIPE_CAP_VERTEXID_NOBASE:
 208    case PIPE_CAP_POLYGON_OFFSET_CLAMP:
 209    case PIPE_CAP_MULTISAMPLE_Z_RESOLVE:
 210    case PIPE_CAP_RESOURCE_FROM_USER_MEMORY:
 211    case PIPE_CAP_DEVICE_RESET_STATUS_QUERY:
 212    case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
 213    case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
 214    case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
 215    case PIPE_CAP_DEPTH_BOUNDS_TEST:
 216    case PIPE_CAP_TGSI_TXQS:
 217    case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
 218    case PIPE_CAP_SHAREABLE_SHADERS:
 219    case PIPE_CAP_CLEAR_TEXTURE:
 220    case PIPE_CAP_DRAW_PARAMETERS:
 221    case PIPE_CAP_TGSI_PACK_HALF_FLOAT:
 222    case PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL:
 223    case PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL:
 224    case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
 225    case PIPE_CAP_INVALIDATE_BUFFER:
 226    case PIPE_CAP_GENERATE_MIPMAP:
 227    case PIPE_CAP_SURFACE_REINTERPRET_BLOCKS:
 228    case PIPE_CAP_QUERY_BUFFER_OBJECT:
 229    case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
 230    case PIPE_CAP_STRING_MARKER:
 231    case PIPE_CAP_QUERY_MEMORY_INFO:
 232    case PIPE_CAP_PCI_GROUP:
 233    case PIPE_CAP_PCI_BUS:
 234    case PIPE_CAP_PCI_DEVICE:
 235    case PIPE_CAP_PCI_FUNCTION:
 236    case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
 237    case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
 238    case PIPE_CAP_CULL_DISTANCE:
 239    case PIPE_CAP_PRIMITIVE_RESTART_FOR_PATCHES:
 240    case PIPE_CAP_TGSI_VOTE:
 241    case PIPE_CAP_MAX_WINDOW_RECTANGLES:
 242    case PIPE_CAP_POLYGON_OFFSET_UNITS_UNSCALED:
 243    case PIPE_CAP_VIEWPORT_SUBPIXEL_BITS:
 244    case PIPE_CAP_TGSI_ARRAY_COMPONENTS:
 245    case PIPE_CAP_TGSI_CAN_READ_OUTPUTS:
 246    case PIPE_CAP_GLSL_OPTIMIZE_CONSERVATIVELY:
 247    case PIPE_CAP_TGSI_FS_FBFETCH:
 248    case PIPE_CAP_TGSI_MUL_ZERO_WINS:
 249    case PIPE_CAP_INT64:
 250    case PIPE_CAP_INT64_DIVMOD:
 251    case PIPE_CAP_TGSI_TEX_TXF_LZ:
 252    case PIPE_CAP_TGSI_CLOCK:
 253    case PIPE_CAP_POLYGON_MODE_FILL_RECTANGLE:
 254    case PIPE_CAP_SPARSE_BUFFER_PAGE_SIZE:
 255    case PIPE_CAP_TGSI_BALLOT:
 256    case PIPE_CAP_DOUBLES:
 257    case PIPE_CAP_TGSI_TES_LAYER_VIEWPORT:
 258    case PIPE_CAP_CAN_BIND_CONST_BUFFER_AS_VERTEX:
 259    case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
 260    case PIPE_CAP_POST_DEPTH_COVERAGE:
 261    case PIPE_CAP_BINDLESS_TEXTURE:
 262    case PIPE_CAP_NIR_SAMPLERS_AS_DEREF:
 263    case PIPE_CAP_QUERY_SO_OVERFLOW:
 264    case PIPE_CAP_MEMOBJ:
 265    case PIPE_CAP_LOAD_CONSTBUF:
 266    case PIPE_CAP_TGSI_ANY_REG_AS_ADDRESS:
 267    case PIPE_CAP_TILE_RASTER_ORDER:
 268    case PIPE_CAP_MAX_COMBINED_SHADER_OUTPUT_RESOURCES:
 269    case PIPE_CAP_SIGNED_VERTEX_BUFFER_OFFSET:
 270    case PIPE_CAP_CONTEXT_PRIORITY_MASK:
 271       return 0;
 272    case PIPE_CAP_VENDOR_ID:
 273       return 0x1af4;
 274    case PIPE_CAP_DEVICE_ID:
 275       return 0x1010;
 276    case PIPE_CAP_ACCELERATED:
 277       return 1;
 278    case PIPE_CAP_UMA:
 279    case PIPE_CAP_VIDEO_MEMORY:
 280       return 0;
 281    case PIPE_CAP_NATIVE_FENCE_FD:
 282       return 0;
 283    }
 284    /* should only get here on unhandled cases */
 285    debug_printf("Unexpected PIPE_CAP %d query\n", param);
 286    return 0;
 287 }
 288
 289 static int
 290 virgl_get_shader_param(struct pipe_screen *screen,
 291                        enum pipe_shader_type shader,
 292                        enum pipe_shader_cap param)
 293 {
 294    struct virgl_screen *vscreen = virgl_screen(screen);
 295    switch(shader)
 296    {
 297    case PIPE_SHADER_FRAGMENT:
 298    case PIPE_SHADER_VERTEX:
 299    case PIPE_SHADER_GEOMETRY:
 300       switch (param) {
 301       case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
 302       case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
 303       case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
 304       case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
 305          return INT_MAX;
 306       case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
 307       case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
 308       case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
 309          return 1;
 310       case PIPE_SHADER_CAP_MAX_INPUTS:
 311          if (vscreen->caps.caps.v1.glsl_level < 150)
 312             return 16;
 313          return (shader == PIPE_SHADER_VERTEX ||
 314                  shader == PIPE_SHADER_GEOMETRY) ? 16 : 32;
 315       case PIPE_SHADER_CAP_MAX_OUTPUTS:
 316          return 32;
 317      // case PIPE_SHADER_CAP_MAX_CONSTS:
 318      //    return 4096;
 319       case PIPE_SHADER_CAP_MAX_TEMPS:
 320          return 256;
 321       case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
 322          return vscreen->caps.caps.v1.max_uniform_blocks;
 323     //  case PIPE_SHADER_CAP_MAX_ADDRS:
 324      //    return 1;
 325       case PIPE_SHADER_CAP_SUBROUTINES:
 326          return 1;
 327       case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
 328             return 16;
 329       case PIPE_SHADER_CAP_INTEGERS:
 330          return vscreen->caps.caps.v1.glsl_level >= 130;
 331       case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
 332          return 32;
 333       case PIPE_SHADER_CAP_MAX_CONST_BUFFER_SIZE:
 334          return 4096 * sizeof(float[4]);
 335       case PIPE_SHADER_CAP_LOWER_IF_THRESHOLD:
 336       case PIPE_SHADER_CAP_TGSI_SKIP_MERGE_REGISTERS:
 337       case PIPE_SHADER_CAP_INT64_ATOMICS:
 338       case PIPE_SHADER_CAP_FP16:
 339       case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS:
 340       case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS:
 341       default:
 342          return 0;
 343       }
 344    default:
 345       return 0;
 346    }
 347 }
 348
 349 static float
 350 virgl_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
 351 {
 352    switch (param) {
 353    case PIPE_CAPF_MAX_LINE_WIDTH:
 354       /* fall-through */
 355    case PIPE_CAPF_MAX_LINE_WIDTH_AA:
 356       return 255.0; /* arbitrary */
 357    case PIPE_CAPF_MAX_POINT_WIDTH:
 358       /* fall-through */
 359    case PIPE_CAPF_MAX_POINT_WIDTH_AA:
 360       return 255.0; /* arbitrary */
 361    case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
 362       return 16.0;
 363    case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
 364       return 16.0; /* arbitrary */
 365    case PIPE_CAPF_GUARD_BAND_LEFT:
 366    case PIPE_CAPF_GUARD_BAND_TOP:
 367    case PIPE_CAPF_GUARD_BAND_RIGHT:
 368    case PIPE_CAPF_GUARD_BAND_BOTTOM:
 369       return 0.0;
 370    }
 371    /* should only get here on unhandled cases */
 372    debug_printf("Unexpected PIPE_CAPF %d query\n", param);
 373    return 0.0;
 374 }
 375
 376 static boolean
 377 virgl_is_vertex_format_supported(struct pipe_screen *screen,
 378                                  enum pipe_format format)
 379 {
 380    struct virgl_screen *vscreen = virgl_screen(screen);
 381    const struct util_format_description *format_desc;
 382    int i;
 383
 384    format_desc = util_format_description(format);
 385    if (!format_desc)
 386       return FALSE;
 387
 388    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 389       int vformat = VIRGL_FORMAT_R11G11B10_FLOAT;
 390       int big = vformat / 32;
 391       int small = vformat % 32;
 392       if (!(vscreen->caps.caps.v1.vertexbuffer.bitmask[big] & (1 << small)))
 393          return FALSE;
 394       return TRUE;
 395    }
 396
 397    /* Find the first non-VOID channel. */
 398    for (i = 0; i < 4; i++) {
 399       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 400          break;
 401       }
 402    }
 403
 404    if (i == 4)
 405       return FALSE;
 406
 407    if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
 408       return FALSE;
 409
 410    if (format_desc->channel[i].type == UTIL_FORMAT_TYPE_FIXED)
 411       return FALSE;
 412    return TRUE;
 413 }
 414
 415 /**
 416  * Query format support for creating a texture, drawing surface, etc.
 417  * \param format  the format to test
 418  * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 419  */
 420 static boolean
 421 virgl_is_format_supported( struct pipe_screen *screen,
 422                                  enum pipe_format format,
 423                                  enum pipe_texture_target target,
 424                                  unsigned sample_count,
 425                                  unsigned bind)
 426 {
 427    struct virgl_screen *vscreen = virgl_screen(screen);
 428    const struct util_format_description *format_desc;
 429    int i;
 430
 431    assert(target == PIPE_BUFFER ||
 432           target == PIPE_TEXTURE_1D ||
 433           target == PIPE_TEXTURE_1D_ARRAY ||
 434           target == PIPE_TEXTURE_2D ||
 435           target == PIPE_TEXTURE_2D_ARRAY ||
 436           target == PIPE_TEXTURE_RECT ||
 437           target == PIPE_TEXTURE_3D ||
 438           target == PIPE_TEXTURE_CUBE ||
 439           target == PIPE_TEXTURE_CUBE_ARRAY);
 440
 441    format_desc = util_format_description(format);
 442    if (!format_desc)
 443       return FALSE;
 444
 445    if (util_format_is_intensity(format))
 446       return FALSE;
 447
 448    if (sample_count > 1) {
 449       if (!vscreen->caps.caps.v1.bset.texture_multisample)
 450          return FALSE;
 451       if (sample_count > vscreen->caps.caps.v1.max_samples)
 452          return FALSE;
 453    }
 454
 455    if (bind & PIPE_BIND_VERTEX_BUFFER) {
 456       return virgl_is_vertex_format_supported(screen, format);
 457    }
 458
 459    if (bind & PIPE_BIND_RENDER_TARGET) {
 460       if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
 461          return FALSE;
 462
 463       /*
 464        * Although possible, it is unnatural to render into compressed or YUV
 465        * surfaces. So disable these here to avoid going into weird paths
 466        * inside the state trackers.
 467        */
 468       if (format_desc->block.width != 1 ||
 469           format_desc->block.height != 1)
 470          return FALSE;
 471
 472       {
 473          int big = format / 32;
 474          int small = format % 32;
 475          if (!(vscreen->caps.caps.v1.render.bitmask[big] & (1 << small)))
 476             return FALSE;
 477       }
 478    }
 479
 480    if (bind & PIPE_BIND_DEPTH_STENCIL) {
 481       if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
 482          return FALSE;
 483    }
 484
 485    /*
 486     * All other operations (sampling, transfer, etc).
 487     */
 488
 489    if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
 490       goto out_lookup;
 491    }
 492    if (format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC) {
 493       goto out_lookup;
 494    }
 495    if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC) {
 496       goto out_lookup;
 497    }
 498
 499    if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
 500       goto out_lookup;
 501    } else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
 502       goto out_lookup;
 503    }
 504
 505    /* Find the first non-VOID channel. */
 506    for (i = 0; i < 4; i++) {
 507       if (format_desc->channel[i].type != UTIL_FORMAT_TYPE_VOID) {
 508          break;
 509       }
 510    }
 511
 512    if (i == 4)
 513       return FALSE;
 514
 515    /* no L4A4 */
 516    if (format_desc->nr_channels < 4 && format_desc->channel[i].size == 4)
 517       return FALSE;
 518
 519  out_lookup:
 520    {
 521       int big = format / 32;
 522       int small = format % 32;
 523       if (!(vscreen->caps.caps.v1.sampler.bitmask[big] & (1 << small)))
 524          return FALSE;
 525    }
 526    /*
 527     * Everything else should be supported by u_format.
 528     */
 529    return TRUE;
 530 }
 531
 532 static void virgl_flush_frontbuffer(struct pipe_screen *screen,
 533                                       struct pipe_resource *res,
 534                                       unsigned level, unsigned layer,
 535                                     void *winsys_drawable_handle, struct pipe_box *sub_box)
 536 {
 537    struct virgl_screen *vscreen = virgl_screen(screen);
 538    struct virgl_winsys *vws = vscreen->vws;
 539    struct virgl_resource *vres = virgl_resource(res);
 540
 541    if (vws->flush_frontbuffer)
 542       vws->flush_frontbuffer(vws, vres->hw_res, level, layer, winsys_drawable_handle,
 543                              sub_box);
 544 }
 545
 546 static void virgl_fence_reference(struct pipe_screen *screen,
 547                                   struct pipe_fence_handle **ptr,
 548                                   struct pipe_fence_handle *fence)
 549 {
 550    struct virgl_screen *vscreen = virgl_screen(screen);
 551    struct virgl_winsys *vws = vscreen->vws;
 552
 553    vws->fence_reference(vws, ptr, fence);
 554 }
 555
 556 static boolean virgl_fence_finish(struct pipe_screen *screen,
 557                                   struct pipe_context *ctx,
 558                                   struct pipe_fence_handle *fence,
 559                                   uint64_t timeout)
 560 {
 561    struct virgl_screen *vscreen = virgl_screen(screen);
 562    struct virgl_winsys *vws = vscreen->vws;
 563
 564    return vws->fence_wait(vws, fence, timeout);
 565 }
 566
 567 static uint64_t
 568 virgl_get_timestamp(struct pipe_screen *_screen)
 569 {
 570    return os_time_get_nano();
 571 }
 572
 573 static void
 574 virgl_destroy_screen(struct pipe_screen *screen)
 575 {
 576    struct virgl_screen *vscreen = virgl_screen(screen);
 577    struct virgl_winsys *vws = vscreen->vws;
 578
 579    slab_destroy_parent(&vscreen->texture_transfer_pool);
 580
 581    if (vws)
 582       vws->destroy(vws);
 583    FREE(vscreen);
 584 }
 585
 586 struct pipe_screen *
 587 virgl_create_screen(struct virgl_winsys *vws)
 588 {
 589    struct virgl_screen *screen = CALLOC_STRUCT(virgl_screen);
 590
 591    if (!screen)
 592       return NULL;
 593
 594    screen->vws = vws;
 595    screen->base.get_name = virgl_get_name;
 596    screen->base.get_vendor = virgl_get_vendor;
 597    screen->base.get_param = virgl_get_param;
 598    screen->base.get_shader_param = virgl_get_shader_param;
 599    screen->base.get_paramf = virgl_get_paramf;
 600    screen->base.is_format_supported = virgl_is_format_supported;
 601    screen->base.destroy = virgl_destroy_screen;
 602    screen->base.context_create = virgl_context_create;
 603    screen->base.flush_frontbuffer = virgl_flush_frontbuffer;
 604    screen->base.get_timestamp = virgl_get_timestamp;
 605    screen->base.fence_reference = virgl_fence_reference;
 606    //screen->base.fence_signalled = virgl_fence_signalled;
 607    screen->base.fence_finish = virgl_fence_finish;
 608
 609    virgl_init_screen_resource_functions(&screen->base);
 610
 611    vws->get_caps(vws, &screen->caps);
 612
 613    screen->refcnt = 1;
 614
 615    slab_create_parent(&screen->texture_transfer_pool, sizeof(struct virgl_transfer), 16);
 616
 617    return &screen->base;
 618 }