drivers/virgl/virgl_screen.c

/*
 * Copyright 2014, 2015 Red Hat.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHOR(S) AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "util/u_memory.h"
#include "util/format/u_format.h"
#include "util/format/u_format_s3tc.h"
#include "util/u_screen.h"
#include "util/u_video.h"
#include "util/u_math.h"
#include "util/u_inlines.h"
#include "util/os_time.h"
#include "util/xmlconfig.h"
#include "pipe/p_defines.h"
#include "pipe/p_screen.h"
#include "nir/nir_to_tgsi.h"
#include "vl/vl_decoder.h"
#include "vl/vl_video_buffer.h"

#include "virgl_screen.h"
#include "virgl_resource.h"
#include "virgl_public.h"
#include "virgl_context.h"
#include "virgl_encode.h"

int virgl_debug = 0;
const struct debug_named_value virgl_debug_options[] = {
   { "verbose",         VIRGL_DEBUG_VERBOSE,                 NULL },
   { "tgsi",            VIRGL_DEBUG_TGSI,                    NULL },
   { "noemubgra",       VIRGL_DEBUG_NO_EMULATE_BGRA,         "Disable tweak to emulate BGRA as RGBA on GLES hosts" },
   { "nobgraswz",       VIRGL_DEBUG_NO_BGRA_DEST_SWIZZLE,    "Disable tweak to swizzle emulated BGRA on GLES hosts" },
   { "sync",            VIRGL_DEBUG_SYNC,                    "Sync after every flush" },
   { "xfer",            VIRGL_DEBUG_XFER,                    "Do not optimize for transfers" },
   { "r8srgb-readback", VIRGL_DEBUG_L8_SRGB_ENABLE_READBACK, "Enable redaback for L8 sRGB textures" },
   { "nocoherent",      VIRGL_DEBUG_NO_COHERENT,             "Disable coherent memory" },
   { "video",           VIRGL_DEBUG_VIDEO,                   "Video codec" },
   { "shader_sync",     VIRGL_DEBUG_SHADER_SYNC,             "Sync after every shader link" },
   DEBUG_NAMED_VALUE_END
};
DEBUG_GET_ONCE_FLAGS_OPTION(virgl_debug, "VIRGL_DEBUG", virgl_debug_options, 0)

static const char *
virgl_get_vendor(struct pipe_screen *screen)
{
   return "Mesa";
}


static const char *
virgl_get_name(struct pipe_screen *screen)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   if (vscreen->caps.caps.v2.host_feature_check_version >= 5)
      return vscreen->caps.caps.v2.renderer;

   return "virgl";
}

static int
virgl_get_param(struct pipe_screen *screen, enum pipe_cap param)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   switch (param) {
   case PIPE_CAP_NPOT_TEXTURES:
      return 1;
   case PIPE_CAP_FRAGMENT_SHADER_TEXTURE_LOD:
   case PIPE_CAP_FRAGMENT_SHADER_DERIVATIVES:
      return 1;
   case PIPE_CAP_ANISOTROPIC_FILTER:
      return vscreen->caps.caps.v2.max_anisotropy > 1.0;
   case PIPE_CAP_MAX_RENDER_TARGETS:
      return vscreen->caps.caps.v1.max_render_targets;
   case PIPE_CAP_MAX_DUAL_SOURCE_RENDER_TARGETS:
      return vscreen->caps.caps.v1.max_dual_source_render_targets;
   case PIPE_CAP_OCCLUSION_QUERY:
      return vscreen->caps.caps.v1.bset.occlusion_query;
   case PIPE_CAP_TEXTURE_MIRROR_CLAMP_TO_EDGE:
      if (vscreen->caps.caps.v2.host_feature_check_version >= 20)
         return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_MIRROR_CLAMP_TO_EDGE;
      FALLTHROUGH;
   case PIPE_CAP_TEXTURE_MIRROR_CLAMP:
      if (vscreen->caps.caps.v2.host_feature_check_version >= 22)
         return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_MIRROR_CLAMP;
      return vscreen->caps.caps.v1.bset.mirror_clamp &&
             !(vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_HOST_IS_GLES);
   case PIPE_CAP_TEXTURE_SWIZZLE:
      return 1;
   case PIPE_CAP_MAX_TEXTURE_2D_SIZE:
      if (vscreen->caps.caps.v2.max_texture_2d_size)
         return vscreen->caps.caps.v2.max_texture_2d_size;
      return 16384;
   case PIPE_CAP_MAX_TEXTURE_3D_LEVELS:
      if (vscreen->caps.caps.v2.max_texture_3d_size)
         return 1 + util_logbase2(vscreen->caps.caps.v2.max_texture_3d_size);
      return 9; /* 256 x 256 x 256 */
   case PIPE_CAP_MAX_TEXTURE_CUBE_LEVELS:
      if (vscreen->caps.caps.v2.max_texture_cube_size)
         return 1 + util_logbase2(vscreen->caps.caps.v2.max_texture_cube_size);
      return 13; /* 4K x 4K */
   case PIPE_CAP_BLEND_EQUATION_SEPARATE:
      return 1;
   case PIPE_CAP_INDEP_BLEND_ENABLE:
      return vscreen->caps.caps.v1.bset.indep_blend_enable;
   case PIPE_CAP_INDEP_BLEND_FUNC:
      return vscreen->caps.caps.v1.bset.indep_blend_func;
   case PIPE_CAP_FS_COORD_ORIGIN_UPPER_LEFT:
   case PIPE_CAP_FS_COORD_PIXEL_CENTER_HALF_INTEGER:
   case PIPE_CAP_FS_COORD_PIXEL_CENTER_INTEGER:
      return 1;
   case PIPE_CAP_FS_COORD_ORIGIN_LOWER_LEFT:
      return vscreen->caps.caps.v1.bset.fragment_coord_conventions;
   case PIPE_CAP_DEPTH_CLIP_DISABLE:
      if (vscreen->caps.caps.v1.bset.depth_clip_disable)
         return 1;
      return 0;
   case PIPE_CAP_MAX_STREAM_OUTPUT_BUFFERS:
      return vscreen->caps.caps.v1.max_streamout_buffers;
   case PIPE_CAP_MAX_STREAM_OUTPUT_SEPARATE_COMPONENTS:
   case PIPE_CAP_MAX_STREAM_OUTPUT_INTERLEAVED_COMPONENTS:
      return 16*4;
   case PIPE_CAP_SUPPORTED_PRIM_MODES:
      return BITFIELD_MASK(MESA_PRIM_COUNT) &
            ~BITFIELD_BIT(MESA_PRIM_QUADS) &
            ~BITFIELD_BIT(MESA_PRIM_QUAD_STRIP);
   case PIPE_CAP_PRIMITIVE_RESTART:
   case PIPE_CAP_PRIMITIVE_RESTART_FIXED_INDEX:
      return vscreen->caps.caps.v1.bset.primitive_restart;
   case PIPE_CAP_SHADER_STENCIL_EXPORT:
      return vscreen->caps.caps.v1.bset.shader_stencil_export;
   case PIPE_CAP_VS_INSTANCEID:
   case PIPE_CAP_VERTEX_ELEMENT_INSTANCE_DIVISOR:
      return 1;
   case PIPE_CAP_SEAMLESS_CUBE_MAP:
      return vscreen->caps.caps.v1.bset.seamless_cube_map;
   case PIPE_CAP_SEAMLESS_CUBE_MAP_PER_TEXTURE:
      return vscreen->caps.caps.v1.bset.seamless_cube_map_per_texture;
   case PIPE_CAP_MAX_TEXTURE_ARRAY_LAYERS:
      return vscreen->caps.caps.v1.max_texture_array_layers;
   case PIPE_CAP_MIN_TEXEL_OFFSET:
      return vscreen->caps.caps.v2.min_texel_offset;
   case PIPE_CAP_MIN_TEXTURE_GATHER_OFFSET:
      return vscreen->caps.caps.v2.min_texture_gather_offset;
   case PIPE_CAP_MAX_TEXEL_OFFSET:
      return vscreen->caps.caps.v2.max_texel_offset;
   case PIPE_CAP_MAX_TEXTURE_GATHER_OFFSET:
      return vscreen->caps.caps.v2.max_texture_gather_offset;
   case PIPE_CAP_CONDITIONAL_RENDER:
      return vscreen->caps.caps.v1.bset.conditional_render;
   case PIPE_CAP_TEXTURE_BARRIER:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TEXTURE_BARRIER;
   case PIPE_CAP_VERTEX_COLOR_UNCLAMPED:
      return 1;
   case PIPE_CAP_FRAGMENT_COLOR_CLAMPED:
   case PIPE_CAP_VERTEX_COLOR_CLAMPED:
      return vscreen->caps.caps.v1.bset.color_clamping;
   case PIPE_CAP_MIXED_COLORBUFFER_FORMATS:
      return (vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_FBO_MIXED_COLOR_FORMATS) ||
            (vscreen->caps.caps.v2.host_feature_check_version < 1);
   case PIPE_CAP_GLSL_FEATURE_LEVEL_COMPATIBILITY:
       if (vscreen->caps.caps.v2.host_feature_check_version < 6)
           return MIN2(vscreen->caps.caps.v1.glsl_level, 140);
       FALLTHROUGH;
   case PIPE_CAP_GLSL_FEATURE_LEVEL:
      return vscreen->caps.caps.v1.glsl_level;
   case PIPE_CAP_QUADS_FOLLOW_PROVOKING_VERTEX_CONVENTION:
      return 1;
   case PIPE_CAP_DEPTH_CLIP_DISABLE_SEPARATE:
      return 0;
   case PIPE_CAP_COMPUTE:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_COMPUTE_SHADER;
   case PIPE_CAP_USER_VERTEX_BUFFERS:
      return 0;
   case PIPE_CAP_CONSTANT_BUFFER_OFFSET_ALIGNMENT:
      return vscreen->caps.caps.v2.uniform_buffer_offset_alignment;
   case PIPE_CAP_STREAM_OUTPUT_PAUSE_RESUME:
   case PIPE_CAP_STREAM_OUTPUT_INTERLEAVE_BUFFERS:
      return vscreen->caps.caps.v1.bset.streamout_pause_resume;
   case PIPE_CAP_START_INSTANCE:
      return vscreen->caps.caps.v1.bset.start_instance;
   case PIPE_CAP_TGSI_CAN_COMPACT_CONSTANTS:
   case PIPE_CAP_VERTEX_BUFFER_OFFSET_4BYTE_ALIGNED_ONLY:
   case PIPE_CAP_VERTEX_BUFFER_STRIDE_4BYTE_ALIGNED_ONLY:
   case PIPE_CAP_VERTEX_ELEMENT_SRC_OFFSET_4BYTE_ALIGNED_ONLY:
   case PIPE_CAP_TEXTURE_TRANSFER_MODES:
   case PIPE_CAP_NIR_IMAGES_AS_DEREF:
      return 0;
   case PIPE_CAP_QUERY_TIMESTAMP:
   case PIPE_CAP_QUERY_TIME_ELAPSED:
      if (vscreen->caps.caps.v2.host_feature_check_version >= 15)
         return vscreen->caps.caps.v1.bset.timer_query;
      return 1; /* older versions had this always enabled */
   case PIPE_CAP_TGSI_TEXCOORD:
      return vscreen->caps.caps.v2.host_feature_check_version >= 10;
   case PIPE_CAP_MIN_MAP_BUFFER_ALIGNMENT:
      return VIRGL_MAP_BUFFER_ALIGNMENT;
   case PIPE_CAP_TEXTURE_BUFFER_OBJECTS:
      return vscreen->caps.caps.v1.max_tbo_size > 0;
   case PIPE_CAP_TEXTURE_BUFFER_OFFSET_ALIGNMENT:
      return vscreen->caps.caps.v2.texture_buffer_offset_alignment;
   case PIPE_CAP_BUFFER_SAMPLER_VIEW_RGBA_ONLY:
      return 0;
   case PIPE_CAP_CUBE_MAP_ARRAY:
      return vscreen->caps.caps.v1.bset.cube_map_array;
   case PIPE_CAP_TEXTURE_MULTISAMPLE:
      return vscreen->caps.caps.v1.bset.texture_multisample;
   case PIPE_CAP_MAX_VIEWPORTS:
      return vscreen->caps.caps.v1.max_viewports;
   case PIPE_CAP_MAX_TEXEL_BUFFER_ELEMENTS_UINT:
      return vscreen->caps.caps.v1.max_tbo_size;
   case PIPE_CAP_TEXTURE_BORDER_COLOR_QUIRK:
   case PIPE_CAP_ENDIANNESS:
      return 0;
   case PIPE_CAP_QUERY_PIPELINE_STATISTICS:
      return !!(vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_PIPELINE_STATISTICS_QUERY);
   case PIPE_CAP_MIXED_FRAMEBUFFER_SIZES:
   case PIPE_CAP_MIXED_COLOR_DEPTH_BITS:
      return 1;
   case PIPE_CAP_VS_LAYER_VIEWPORT:
      return (vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_VS_VERTEX_LAYER) &&
            (vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_VS_VIEWPORT_INDEX);
   case PIPE_CAP_MAX_GEOMETRY_OUTPUT_VERTICES:
      return vscreen->caps.caps.v2.max_geom_output_vertices;
   case PIPE_CAP_MAX_GEOMETRY_TOTAL_OUTPUT_COMPONENTS:
      return vscreen->caps.caps.v2.max_geom_total_output_components;
   case PIPE_CAP_TEXTURE_QUERY_LOD:
      return vscreen->caps.caps.v1.bset.texture_query_lod;
   case PIPE_CAP_MAX_TEXTURE_GATHER_COMPONENTS:
      return vscreen->caps.caps.v1.max_texture_gather_components;
   case PIPE_CAP_DRAW_INDIRECT:
      return vscreen->caps.caps.v1.bset.has_indirect_draw;
   case PIPE_CAP_SAMPLE_SHADING:
   case PIPE_CAP_FORCE_PERSAMPLE_INTERP:
      return vscreen->caps.caps.v1.bset.has_sample_shading;
   case PIPE_CAP_CULL_DISTANCE:
      return vscreen->caps.caps.v1.bset.has_cull;
   case PIPE_CAP_MAX_VERTEX_STREAMS:
      return ((vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TRANSFORM_FEEDBACK3) ||
              (vscreen->caps.caps.v2.host_feature_check_version < 2)) ? 4 : 1;
   case PIPE_CAP_CONDITIONAL_RENDER_INVERTED:
      return vscreen->caps.caps.v1.bset.conditional_render_inverted;
   case PIPE_CAP_FS_FINE_DERIVATIVE:
      return vscreen->caps.caps.v1.bset.derivative_control;
   case PIPE_CAP_POLYGON_OFFSET_CLAMP:
      return vscreen->caps.caps.v1.bset.polygon_offset_clamp;
   case PIPE_CAP_QUERY_SO_OVERFLOW:
      return vscreen->caps.caps.v1.bset.transform_feedback_overflow_query;
   case PIPE_CAP_SHADER_BUFFER_OFFSET_ALIGNMENT:
      return vscreen->caps.caps.v2.shader_buffer_offset_alignment;
   case PIPE_CAP_DOUBLES:
      return vscreen->caps.caps.v1.bset.has_fp64 ||
            (vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_HOST_IS_GLES);
   case PIPE_CAP_MAX_SHADER_PATCH_VARYINGS:
      return vscreen->caps.caps.v2.max_shader_patch_varyings;
   case PIPE_CAP_SAMPLER_VIEW_TARGET:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TEXTURE_VIEW;
   case PIPE_CAP_MAX_VERTEX_ATTRIB_STRIDE:
      return vscreen->caps.caps.v2.max_vertex_attrib_stride;
   case PIPE_CAP_COPY_BETWEEN_COMPRESSED_AND_PLAIN_FORMATS:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_COPY_IMAGE;
   case PIPE_CAP_TEXTURE_QUERY_SAMPLES:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TXQS;
   case PIPE_CAP_FRAMEBUFFER_NO_ATTACHMENT:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_FB_NO_ATTACH;
   case PIPE_CAP_ROBUST_BUFFER_ACCESS_BEHAVIOR:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_ROBUST_BUFFER_ACCESS;
   case PIPE_CAP_FBFETCH:
      return (vscreen->caps.caps.v2.capability_bits &
              VIRGL_CAP_TGSI_FBFETCH) ? 1 : 0;
   case PIPE_CAP_BLEND_EQUATION_ADVANCED:
      return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_BLEND_EQUATION;
   case PIPE_CAP_SHADER_CLOCK:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_SHADER_CLOCK;
   case PIPE_CAP_SHADER_ARRAY_COMPONENTS:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_TGSI_COMPONENTS;
   case PIPE_CAP_MAX_COMBINED_SHADER_BUFFERS:
      return vscreen->caps.caps.v2.max_combined_shader_buffers;
   case PIPE_CAP_MAX_COMBINED_HW_ATOMIC_COUNTERS:
      return vscreen->caps.caps.v2.max_combined_atomic_counters;
   case PIPE_CAP_MAX_COMBINED_HW_ATOMIC_COUNTER_BUFFERS:
      return vscreen->caps.caps.v2.max_combined_atomic_counter_buffers;
   case PIPE_CAP_TEXTURE_FLOAT_LINEAR:
   case PIPE_CAP_TEXTURE_HALF_FLOAT_LINEAR:
      return 1; /* TODO: need to introduce a hw-cap for this */
   case PIPE_CAP_QUERY_BUFFER_OBJECT:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_QBO;
   case PIPE_CAP_MAX_VARYINGS:
      if (vscreen->caps.caps.v1.glsl_level < 150)
         return vscreen->caps.caps.v2.max_vertex_attribs;
      return 32;
   case PIPE_CAP_FAKE_SW_MSAA:
      /* If the host supports only one sample (e.g., if it is using softpipe),
       * fake multisampling to able to advertise higher GL versions. */
      return (vscreen->caps.caps.v1.max_samples == 1) ? 1 : 0;
   case PIPE_CAP_MULTI_DRAW_INDIRECT:
      return !!(vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_MULTI_DRAW_INDIRECT);
   case PIPE_CAP_MULTI_DRAW_INDIRECT_PARAMS:
      return !!(vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_INDIRECT_PARAMS);
   case PIPE_CAP_BUFFER_MAP_PERSISTENT_COHERENT:
      return (vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_ARB_BUFFER_STORAGE) &&
             (vscreen->caps.caps.v2.host_feature_check_version >= 4) &&
              vscreen->vws->supports_coherent && !vscreen->no_coherent;
   case PIPE_CAP_PCI_GROUP:
   case PIPE_CAP_PCI_BUS:
   case PIPE_CAP_PCI_DEVICE:
   case PIPE_CAP_PCI_FUNCTION:
   case PIPE_CAP_ALLOW_MAPPED_BUFFERS_DURING_EXECUTION:
      return 0;
   case PIPE_CAP_CLIP_HALFZ:
      return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_CLIP_HALFZ;
   case PIPE_CAP_MAX_GS_INVOCATIONS:
      return 32;
   case PIPE_CAP_MAX_SHADER_BUFFER_SIZE_UINT:
      return 1 << 27;
   case PIPE_CAP_VENDOR_ID:
      return 0x1af4;
   case PIPE_CAP_DEVICE_ID:
      return 0x1010;
   case PIPE_CAP_ACCELERATED:
      return -1; /* -1 means unknown */
   case PIPE_CAP_UMA:
   case PIPE_CAP_VIDEO_MEMORY:
      if (vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_VIDEO_MEMORY)
         return vscreen->caps.caps.v2.max_video_memory;
      return 0;
   case PIPE_CAP_TEXTURE_SHADOW_LOD:
      return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_TEXTURE_SHADOW_LOD;
   case PIPE_CAP_NATIVE_FENCE_FD:
      return vscreen->vws->supports_fences;
   case PIPE_CAP_DEST_SURFACE_SRGB_CONTROL:
      return (vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_SRGB_WRITE_CONTROL) ||
            (vscreen->caps.caps.v2.host_feature_check_version < 1);
   case PIPE_CAP_SHAREABLE_SHADERS:
      /* Shader creation emits the shader through the context's command buffer
       * in virgl_encode_shader_state().
       */
      return 0;
   case PIPE_CAP_QUERY_MEMORY_INFO:
      return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_MEMINFO;
   case PIPE_CAP_STRING_MARKER:
       return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_STRING_MARKER;
   case PIPE_CAP_SURFACE_SAMPLE_COUNT:
       return vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_IMPLICIT_MSAA;
   case PIPE_CAP_DRAW_PARAMETERS:
      return !!(vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_DRAW_PARAMETERS);
   case PIPE_CAP_SHADER_GROUP_VOTE:
      return !!(vscreen->caps.caps.v2.capability_bits_v2 & VIRGL_CAP_V2_GROUP_VOTE);
   case PIPE_CAP_IMAGE_STORE_FORMATTED:
   case PIPE_CAP_GL_SPIRV:
      return 1;
   case PIPE_CAP_MAX_CONSTANT_BUFFER_SIZE_UINT:
      if (vscreen->caps.caps.v2.host_feature_check_version >= 13)
         return vscreen->caps.caps.v2.max_uniform_block_size;
      FALLTHROUGH;
   default:
      return u_pipe_screen_get_param_defaults(screen, param);
   }
}

#define VIRGL_SHADER_STAGE_CAP_V2(CAP, STAGE) \
   vscreen->caps.caps.v2. CAP[virgl_shader_stage_convert(STAGE)]

static int
virgl_get_shader_param(struct pipe_screen *screen,
                       enum pipe_shader_type shader,
                       enum pipe_shader_cap param)
{
   struct virgl_screen *vscreen = virgl_screen(screen);

   if ((shader == PIPE_SHADER_TESS_CTRL || shader == PIPE_SHADER_TESS_EVAL) &&
       !vscreen->caps.caps.v1.bset.has_tessellation_shaders)
      return 0;

   if (shader == PIPE_SHADER_COMPUTE &&
       !(vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_COMPUTE_SHADER))
     return 0;

   switch(shader)
   {
   case PIPE_SHADER_FRAGMENT:
   case PIPE_SHADER_VERTEX:
   case PIPE_SHADER_GEOMETRY:
   case PIPE_SHADER_TESS_CTRL:
   case PIPE_SHADER_TESS_EVAL:
   case PIPE_SHADER_COMPUTE:
      switch (param) {
      case PIPE_SHADER_CAP_MAX_INSTRUCTIONS:
      case PIPE_SHADER_CAP_MAX_ALU_INSTRUCTIONS:
      case PIPE_SHADER_CAP_MAX_TEX_INSTRUCTIONS:
      case PIPE_SHADER_CAP_MAX_TEX_INDIRECTIONS:
         return INT_MAX;
      case PIPE_SHADER_CAP_INDIRECT_OUTPUT_ADDR:
      case PIPE_SHADER_CAP_INDIRECT_TEMP_ADDR:
      case PIPE_SHADER_CAP_INDIRECT_CONST_ADDR:
         return 1;
      case PIPE_SHADER_CAP_INDIRECT_INPUT_ADDR:
         if ((vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_HOST_IS_GLES) &&
             (shader == PIPE_SHADER_VERTEX)) {
            return 0;
         }
         FALLTHROUGH;
      case PIPE_SHADER_CAP_TGSI_ANY_INOUT_DECL_RANGE:
         return vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_INDIRECT_INPUT_ADDR;
      case PIPE_SHADER_CAP_MAX_INPUTS:
         if (vscreen->caps.caps.v1.glsl_level < 150)
            return vscreen->caps.caps.v2.max_vertex_attribs;
         return (shader == PIPE_SHADER_VERTEX ||
                 shader == PIPE_SHADER_GEOMETRY) ? vscreen->caps.caps.v2.max_vertex_attribs : 32;
      case PIPE_SHADER_CAP_MAX_OUTPUTS:
         switch (shader) {
         case PIPE_SHADER_FRAGMENT:
            return vscreen->caps.caps.v1.max_render_targets;
         case PIPE_SHADER_TESS_CTRL:
            if (vscreen->caps.caps.v2.host_feature_check_version >= 19)
               return vscreen->caps.caps.v2.max_tcs_outputs;
            FALLTHROUGH;
         case PIPE_SHADER_TESS_EVAL:
            if (vscreen->caps.caps.v2.host_feature_check_version >= 19)
               return vscreen->caps.caps.v2.max_tes_outputs;
            FALLTHROUGH;
         default:
            return vscreen->caps.caps.v2.max_vertex_outputs;
         }
     // case PIPE_SHADER_CAP_MAX_CONSTS:
     //    return 4096;
      case PIPE_SHADER_CAP_MAX_TEMPS:
         return 256;
      case PIPE_SHADER_CAP_MAX_CONST_BUFFERS:
         return vscreen->caps.caps.v1.max_uniform_blocks;
    //  case PIPE_SHADER_CAP_MAX_ADDRS:
     //    return 1;
      case PIPE_SHADER_CAP_SUBROUTINES:
         return 1;
      case PIPE_SHADER_CAP_MAX_TEXTURE_SAMPLERS:
         return MIN2(vscreen->caps.caps.v2.max_shader_sampler_views,
                     PIPE_MAX_SHADER_SAMPLER_VIEWS);
      case PIPE_SHADER_CAP_INTEGERS:
         return vscreen->caps.caps.v1.glsl_level >= 130;
      case PIPE_SHADER_CAP_MAX_CONTROL_FLOW_DEPTH:
         return 32;
      case PIPE_SHADER_CAP_MAX_CONST_BUFFER0_SIZE:
         if (vscreen->caps.caps.v2.host_feature_check_version < 12)
            return 4096 * sizeof(float[4]);
         return VIRGL_SHADER_STAGE_CAP_V2(max_const_buffer_size, shader);
      case PIPE_SHADER_CAP_MAX_SHADER_BUFFERS:
         if (shader == PIPE_SHADER_FRAGMENT || shader == PIPE_SHADER_COMPUTE)
            return vscreen->caps.caps.v2.max_shader_buffer_frag_compute;
         else
            return vscreen->caps.caps.v2.max_shader_buffer_other_stages;
      case PIPE_SHADER_CAP_MAX_SHADER_IMAGES:
         if (shader == PIPE_SHADER_FRAGMENT || shader == PIPE_SHADER_COMPUTE)
            return vscreen->caps.caps.v2.max_shader_image_frag_compute;
         else
            return vscreen->caps.caps.v2.max_shader_image_other_stages;
      case PIPE_SHADER_CAP_SUPPORTED_IRS:
         return (1 << PIPE_SHADER_IR_TGSI) | (1 << PIPE_SHADER_IR_NIR);
      case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTERS:
         return VIRGL_SHADER_STAGE_CAP_V2(max_atomic_counters, shader);
      case PIPE_SHADER_CAP_MAX_HW_ATOMIC_COUNTER_BUFFERS:
         return VIRGL_SHADER_STAGE_CAP_V2(max_atomic_counter_buffers, shader);
      case PIPE_SHADER_CAP_INT64_ATOMICS:
      case PIPE_SHADER_CAP_FP16:
      case PIPE_SHADER_CAP_FP16_DERIVATIVES:
      case PIPE_SHADER_CAP_FP16_CONST_BUFFERS:
      case PIPE_SHADER_CAP_INT16:
      case PIPE_SHADER_CAP_GLSL_16BIT_CONSTS:
         return 0;
      default:
         return 0;
      }
   default:
      return 0;
   }
}

static int
virgl_get_video_param(struct pipe_screen *screen,
                      enum pipe_video_profile profile,
                      enum pipe_video_entrypoint entrypoint,
                      enum pipe_video_cap param)
{
   unsigned i;
   bool drv_supported;
   struct virgl_video_caps *vcaps = NULL;
   struct virgl_screen *vscreen;

   if (!screen)
       return 0;

   vscreen = virgl_screen(screen);
   if (vscreen->caps.caps.v2.num_video_caps > ARRAY_SIZE(vscreen->caps.caps.v2.video_caps))
       return 0;

   /* Profiles and entrypoints supported by the driver */
   switch (u_reduce_video_profile(profile)) {
   case PIPE_VIDEO_FORMAT_MPEG4_AVC: /* fall through */
   case PIPE_VIDEO_FORMAT_HEVC:
       drv_supported = (entrypoint == PIPE_VIDEO_ENTRYPOINT_BITSTREAM ||
                        entrypoint == PIPE_VIDEO_ENTRYPOINT_ENCODE);
       break;
   case PIPE_VIDEO_FORMAT_MPEG12:
   case PIPE_VIDEO_FORMAT_VC1:
   case PIPE_VIDEO_FORMAT_JPEG:
   case PIPE_VIDEO_FORMAT_VP9:
   case PIPE_VIDEO_FORMAT_AV1:
      drv_supported = (entrypoint == PIPE_VIDEO_ENTRYPOINT_BITSTREAM);
      break;
   default:
       drv_supported = false;
       break;
   }

   if (drv_supported) {
       /* Check if the device supports it, vcaps is NULL means not supported */
       for (i = 0;  i < vscreen->caps.caps.v2.num_video_caps; i++) {
           if (vscreen->caps.caps.v2.video_caps[i].profile == profile &&
               vscreen->caps.caps.v2.video_caps[i].entrypoint == entrypoint) {
               vcaps = &vscreen->caps.caps.v2.video_caps[i];
               break;
           }
       }
   }

   /*
    * Since there are calls like this:
    *   pot_buffers = !pipe->screen->get_video_param
    *   (
    *      pipe->screen,
    *      PIPE_VIDEO_PROFILE_UNKNOWN,
    *      PIPE_VIDEO_ENTRYPOINT_UNKNOWN,
    *      PIPE_VIDEO_CAP_NPOT_TEXTURES
    *   );
    * All parameters need to check the vcaps.
    */
   switch (param) {
      case PIPE_VIDEO_CAP_SUPPORTED:
         return vcaps != NULL;
      case PIPE_VIDEO_CAP_NPOT_TEXTURES:
         return vcaps ? vcaps->npot_texture : true;
      case PIPE_VIDEO_CAP_MAX_WIDTH:
         return vcaps ? vcaps->max_width : 0;
      case PIPE_VIDEO_CAP_MAX_HEIGHT:
         return vcaps ? vcaps->max_height : 0;
      case PIPE_VIDEO_CAP_PREFERED_FORMAT:
         return vcaps ? virgl_to_pipe_format(vcaps->prefered_format) : PIPE_FORMAT_NV12;
      case PIPE_VIDEO_CAP_PREFERS_INTERLACED:
         return vcaps ? vcaps->prefers_interlaced : false;
      case PIPE_VIDEO_CAP_SUPPORTS_INTERLACED:
         return vcaps ? vcaps->supports_interlaced : false;
      case PIPE_VIDEO_CAP_SUPPORTS_PROGRESSIVE:
         return vcaps ? vcaps->supports_progressive : true;
      case PIPE_VIDEO_CAP_MAX_LEVEL:
         return vcaps ? vcaps->max_level : 0;
      case PIPE_VIDEO_CAP_STACKED_FRAMES:
         return vcaps ? vcaps->stacked_frames : 0;
      case PIPE_VIDEO_CAP_MAX_MACROBLOCKS:
         return vcaps ? vcaps->max_macroblocks : 0;
      case PIPE_VIDEO_CAP_MAX_TEMPORAL_LAYERS:
         return vcaps ? vcaps->max_temporal_layers : 0;
      default:
         return 0;
   }
}

static float
virgl_get_paramf(struct pipe_screen *screen, enum pipe_capf param)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   switch (param) {
   case PIPE_CAPF_MIN_LINE_WIDTH:
   case PIPE_CAPF_MIN_LINE_WIDTH_AA:
   case PIPE_CAPF_MIN_POINT_SIZE:
   case PIPE_CAPF_MIN_POINT_SIZE_AA:
      return 1;
   case PIPE_CAPF_POINT_SIZE_GRANULARITY:
   case PIPE_CAPF_LINE_WIDTH_GRANULARITY:
      return 0.1;
   case PIPE_CAPF_MAX_LINE_WIDTH:
      return vscreen->caps.caps.v2.max_aliased_line_width;
   case PIPE_CAPF_MAX_LINE_WIDTH_AA:
      return vscreen->caps.caps.v2.max_smooth_line_width;
   case PIPE_CAPF_MAX_POINT_SIZE:
      return vscreen->caps.caps.v2.max_aliased_point_size;
   case PIPE_CAPF_MAX_POINT_SIZE_AA:
      return vscreen->caps.caps.v2.max_smooth_point_size;
   case PIPE_CAPF_MAX_TEXTURE_ANISOTROPY:
      return vscreen->caps.caps.v2.max_anisotropy;
   case PIPE_CAPF_MAX_TEXTURE_LOD_BIAS:
      return vscreen->caps.caps.v2.max_texture_lod_bias;
   case PIPE_CAPF_MIN_CONSERVATIVE_RASTER_DILATE:
   case PIPE_CAPF_MAX_CONSERVATIVE_RASTER_DILATE:
   case PIPE_CAPF_CONSERVATIVE_RASTER_DILATE_GRANULARITY:
      return 0.0f;
   }
   /* should only get here on unhandled cases */
   debug_printf("Unexpected PIPE_CAPF %d query\n", param);
   return 0.0;
}

static int
virgl_get_compute_param(struct pipe_screen *screen,
                        enum pipe_shader_ir ir_type,
                        enum pipe_compute_cap param,
                        void *ret)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   if (!(vscreen->caps.caps.v2.capability_bits & VIRGL_CAP_COMPUTE_SHADER))
      return 0;
   switch (param) {
   case PIPE_COMPUTE_CAP_MAX_GRID_SIZE:
      if (ret) {
         uint64_t *grid_size = ret;
         grid_size[0] = vscreen->caps.caps.v2.max_compute_grid_size[0];
         grid_size[1] = vscreen->caps.caps.v2.max_compute_grid_size[1];
         grid_size[2] = vscreen->caps.caps.v2.max_compute_grid_size[2];
      }
      return 3 * sizeof(uint64_t) ;
   case PIPE_COMPUTE_CAP_MAX_BLOCK_SIZE:
      if (ret) {
         uint64_t *block_size = ret;
         block_size[0] = vscreen->caps.caps.v2.max_compute_block_size[0];
         block_size[1] = vscreen->caps.caps.v2.max_compute_block_size[1];
         block_size[2] = vscreen->caps.caps.v2.max_compute_block_size[2];
      }
      return 3 * sizeof(uint64_t);
   case PIPE_COMPUTE_CAP_MAX_THREADS_PER_BLOCK:
      if (ret) {
         uint64_t *max_threads_per_block = ret;
         *max_threads_per_block = vscreen->caps.caps.v2.max_compute_work_group_invocations;
      }
      return sizeof(uint64_t);
   case PIPE_COMPUTE_CAP_MAX_LOCAL_SIZE:
      if (ret) {
         uint64_t *max_local_size = ret;
         /* Value reported by the closed source driver. */
         *max_local_size = vscreen->caps.caps.v2.max_compute_shared_memory_size;
      }
      return sizeof(uint64_t);
   default:
      break;
   }
   return 0;
}

static bool
has_format_bit(struct virgl_supported_format_mask *mask,
               enum virgl_formats fmt)
{
   assert(fmt < VIRGL_FORMAT_MAX);
   unsigned val = (unsigned)fmt;
   unsigned idx = val / 32;
   unsigned bit = val % 32;
   assert(idx < ARRAY_SIZE(mask->bitmask));
   return (mask->bitmask[idx] & (1u << bit)) != 0;
}

bool
virgl_has_readback_format(struct pipe_screen *screen,
                          enum virgl_formats fmt, bool allow_tweak)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   if (has_format_bit(&vscreen->caps.caps.v2.supported_readback_formats,
                         fmt))
      return true;

   if (allow_tweak && fmt == VIRGL_FORMAT_L8_SRGB && vscreen->tweak_l8_srgb_readback) {
      return true;
   }

   return false;
}

static bool
virgl_is_vertex_format_supported(struct pipe_screen *screen,
                                 enum pipe_format format)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   const struct util_format_description *format_desc;
   int i;

   format_desc = util_format_description(format);

   if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
      int vformat = VIRGL_FORMAT_R11G11B10_FLOAT;
      int big = vformat / 32;
      int small = vformat % 32;
      if (!(vscreen->caps.caps.v1.vertexbuffer.bitmask[big] & (1 << small)))
         return false;
      return true;
   }

   i = util_format_get_first_non_void_channel(format);
   if (i == -1)
      return false;

   if (format_desc->layout != UTIL_FORMAT_LAYOUT_PLAIN)
      return false;

   if (format_desc->channel[i].type == UTIL_FORMAT_TYPE_FIXED)
      return false;
   return true;
}

static bool
virgl_format_check_bitmask(enum pipe_format format,
                           uint32_t bitmask[16],
                           bool may_emulate_bgra)
{
   enum virgl_formats vformat = pipe_to_virgl_format(format);
   int big = vformat / 32;
   int small = vformat % 32;
   if ((bitmask[big] & (1u << small)))
      return true;

   /* On GLES hosts we don't advertise BGRx_SRGB, but we may be able
    * emulate it by using a swizzled RGBx */
   if (may_emulate_bgra) {
      if (format == PIPE_FORMAT_B8G8R8A8_SRGB)
         format = PIPE_FORMAT_R8G8B8A8_SRGB;
      else if (format == PIPE_FORMAT_B8G8R8X8_SRGB)
         format = PIPE_FORMAT_R8G8B8X8_SRGB;
      else {
         return false;
      }

      vformat = pipe_to_virgl_format(format);
      big = vformat / 32;
      small = vformat % 32;
      if (bitmask[big] & (1 << small))
         return true;
   }
   return false;
}

bool virgl_has_scanout_format(struct virgl_screen *vscreen,
                              enum pipe_format format,
                              bool may_emulate_bgra)
{
   return  virgl_format_check_bitmask(format,
                                      vscreen->caps.caps.v2.scanout.bitmask,
                                      may_emulate_bgra);
}

/**
 * Query format support for creating a texture, drawing surface, etc.
 * \param format  the format to test
 * \param type  one of PIPE_TEXTURE, PIPE_SURFACE
 */
static bool
virgl_is_format_supported( struct pipe_screen *screen,
                                 enum pipe_format format,
                                 enum pipe_texture_target target,
                                 unsigned sample_count,
                                 unsigned storage_sample_count,
                                 unsigned bind)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   const struct util_format_description *format_desc;
   int i;

   union virgl_caps *caps = &vscreen->caps.caps;
   bool may_emulate_bgra = (caps->v2.capability_bits &
                            VIRGL_CAP_APP_TWEAK_SUPPORT) &&
                            vscreen->tweak_gles_emulate_bgra;

   if (MAX2(1, sample_count) != MAX2(1, storage_sample_count))
      return false;

   if (!util_is_power_of_two_or_zero(sample_count))
      return false;

   assert(target == PIPE_BUFFER ||
          target == PIPE_TEXTURE_1D ||
          target == PIPE_TEXTURE_1D_ARRAY ||
          target == PIPE_TEXTURE_2D ||
          target == PIPE_TEXTURE_2D_ARRAY ||
          target == PIPE_TEXTURE_RECT ||
          target == PIPE_TEXTURE_3D ||
          target == PIPE_TEXTURE_CUBE ||
          target == PIPE_TEXTURE_CUBE_ARRAY);

   format_desc = util_format_description(format);

   if (util_format_is_intensity(format))
      return false;

   if (sample_count > 1) {
      if (!caps->v1.bset.texture_multisample)
         return false;

      if (bind & PIPE_BIND_SHADER_IMAGE) {
         if (sample_count > caps->v2.max_image_samples)
            return false;
      }

      if (sample_count > caps->v1.max_samples)
         return false;

      if (caps->v2.host_feature_check_version >= 9 &&
          !has_format_bit(&caps->v2.supported_multisample_formats,
                          pipe_to_virgl_format(format)))
         return false;
   }

   if (bind & PIPE_BIND_VERTEX_BUFFER) {
      return virgl_is_vertex_format_supported(screen, format);
   }

   if (util_format_is_compressed(format) && target == PIPE_BUFFER)
      return false;

   /* Allow 3-comp 32 bit textures only for TBOs (needed for ARB_tbo_rgb32) */
   if ((format == PIPE_FORMAT_R32G32B32_FLOAT ||
       format == PIPE_FORMAT_R32G32B32_SINT ||
       format == PIPE_FORMAT_R32G32B32_UINT) &&
       target != PIPE_BUFFER)
      return false;

   if ((format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC ||
        format_desc->layout == UTIL_FORMAT_LAYOUT_ETC ||
        format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) &&
       target == PIPE_TEXTURE_3D)
      return false;


   if (bind & PIPE_BIND_RENDER_TARGET) {
      /* For ARB_framebuffer_no_attachments. */
      if (format == PIPE_FORMAT_NONE)
         return true;

      if (format_desc->colorspace == UTIL_FORMAT_COLORSPACE_ZS)
         return false;

      /*
       * Although possible, it is unnatural to render into compressed or YUV
       * surfaces. So disable these here to avoid going into weird paths
       * inside gallium frontends.
       */
      if (format_desc->block.width != 1 ||
          format_desc->block.height != 1)
         return false;

      if (!virgl_format_check_bitmask(format,
                                      caps->v1.render.bitmask,
                                      may_emulate_bgra))
         return false;
   }

   if (bind & PIPE_BIND_DEPTH_STENCIL) {
      if (format_desc->colorspace != UTIL_FORMAT_COLORSPACE_ZS)
         return false;
   }

   if (bind & PIPE_BIND_SCANOUT) {
      if (!virgl_format_check_bitmask(format, caps->v2.scanout.bitmask, false))
         return false;
   }

   /*
    * All other operations (sampling, transfer, etc).
    */

   if (format_desc->layout == UTIL_FORMAT_LAYOUT_S3TC) {
      goto out_lookup;
   }
   if (format_desc->layout == UTIL_FORMAT_LAYOUT_RGTC) {
      goto out_lookup;
   }
   if (format_desc->layout == UTIL_FORMAT_LAYOUT_BPTC) {
      goto out_lookup;
   }
   if (format_desc->layout == UTIL_FORMAT_LAYOUT_ETC) {
      goto out_lookup;
   }

   if (format == PIPE_FORMAT_R11G11B10_FLOAT) {
      goto out_lookup;
   } else if (format == PIPE_FORMAT_R9G9B9E5_FLOAT) {
      goto out_lookup;
   }

   if (format_desc->layout == UTIL_FORMAT_LAYOUT_ASTC) {
     goto out_lookup;
   }

   i = util_format_get_first_non_void_channel(format);
   if (i == -1)
      return false;

   /* no L4A4 */
   if (format_desc->nr_channels < 4 && format_desc->channel[i].size == 4)
      return false;

 out_lookup:
   return virgl_format_check_bitmask(format,
                                     caps->v1.sampler.bitmask,
                                     may_emulate_bgra);
}

static bool virgl_is_video_format_supported(struct pipe_screen *screen,
                                            enum pipe_format format,
                                            enum pipe_video_profile profile,
                                            enum pipe_video_entrypoint entrypoint)
{
    return vl_video_buffer_is_format_supported(screen, format, profile, entrypoint);
}


static void virgl_flush_frontbuffer(struct pipe_screen *screen,
                                    struct pipe_context *ctx,
                                      struct pipe_resource *res,
                                      unsigned level, unsigned layer,
                                    void *winsys_drawable_handle, unsigned nboxes, struct pipe_box *sub_box)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct virgl_winsys *vws = vscreen->vws;
   struct virgl_resource *vres = virgl_resource(res);
   struct virgl_context *vctx = virgl_context(ctx);

   if (vws->flush_frontbuffer) {
      virgl_flush_eq(vctx, vctx, NULL);
      vws->flush_frontbuffer(vws, vctx->cbuf, vres->hw_res, level, layer, winsys_drawable_handle,
                             nboxes == 1 ? sub_box : NULL);
   }
}

static void virgl_fence_reference(struct pipe_screen *screen,
                                  struct pipe_fence_handle **ptr,
                                  struct pipe_fence_handle *fence)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct virgl_winsys *vws = vscreen->vws;

   vws->fence_reference(vws, ptr, fence);
}

static bool virgl_fence_finish(struct pipe_screen *screen,
                               struct pipe_context *ctx,
                               struct pipe_fence_handle *fence,
                               uint64_t timeout)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct virgl_winsys *vws = vscreen->vws;
   struct virgl_context *vctx = virgl_context(ctx);

   if (vctx && timeout)
      virgl_flush_eq(vctx, NULL, NULL);

   return vws->fence_wait(vws, fence, timeout);
}

static int virgl_fence_get_fd(struct pipe_screen *screen,
            struct pipe_fence_handle *fence)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct virgl_winsys *vws = vscreen->vws;

   return vws->fence_get_fd(vws, fence);
}

static void
virgl_destroy_screen(struct pipe_screen *screen)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct virgl_winsys *vws = vscreen->vws;

   slab_destroy_parent(&vscreen->transfer_pool);

   if (vws)
      vws->destroy(vws);

   disk_cache_destroy(vscreen->disk_cache);

   FREE(vscreen);
}

static void
fixup_formats(union virgl_caps *caps, struct virgl_supported_format_mask *mask)
{
   const size_t size = ARRAY_SIZE(mask->bitmask);
   for (int i = 0; i < size; ++i) {
      if (mask->bitmask[i] != 0)
         return; /* we got some formats, we definitely have a new protocol */
   }

   /* old protocol used; fall back to considering all sampleable formats valid
    * readback-formats
    */
   for (int i = 0; i < size; ++i)
      mask->bitmask[i] = caps->v1.sampler.bitmask[i];
}

static void virgl_query_memory_info(struct pipe_screen *screen, struct pipe_memory_info *info)
{
   struct virgl_screen *vscreen = virgl_screen(screen);
   struct pipe_context *ctx = screen->context_create(screen, NULL, 0);
   struct virgl_context *vctx = virgl_context(ctx);
   struct virgl_resource *res;
   struct virgl_memory_info virgl_info = {0};
   const static struct pipe_resource templ = {
      .target = PIPE_BUFFER,
      .format = PIPE_FORMAT_R8_UNORM,
      .bind = PIPE_BIND_CUSTOM,
      .width0 = sizeof(struct virgl_memory_info),
      .height0 = 1,
      .depth0 = 1,
      .array_size = 1,
      .last_level = 0,
      .nr_samples = 0,
      .flags = 0
   };

   res = (struct virgl_resource*) screen->resource_create(screen, &templ);

   virgl_encode_get_memory_info(vctx, res);
   ctx->flush(ctx, NULL, 0);
   vscreen->vws->resource_wait(vscreen->vws, res->hw_res);
   pipe_buffer_read(ctx, &res->b, 0, sizeof(struct virgl_memory_info), &virgl_info);

   info->avail_device_memory = virgl_info.avail_device_memory;
   info->avail_staging_memory = virgl_info.avail_staging_memory;
   info->device_memory_evicted = virgl_info.device_memory_evicted;
   info->nr_device_memory_evictions = virgl_info.nr_device_memory_evictions;
   info->total_device_memory = virgl_info.total_device_memory;
   info->total_staging_memory = virgl_info.total_staging_memory;

   screen->resource_destroy(screen, &res->b);
   ctx->destroy(ctx);
}

static struct disk_cache *virgl_get_disk_shader_cache (struct pipe_screen *pscreen)
{
   struct virgl_screen *screen = virgl_screen(pscreen);

   return screen->disk_cache;
}

static void virgl_disk_cache_create(struct virgl_screen *screen)
{
   struct mesa_sha1 sha1_ctx;
   _mesa_sha1_init(&sha1_ctx);

#ifdef HAVE_DL_ITERATE_PHDR
   const struct build_id_note *note =
      build_id_find_nhdr_for_addr(virgl_disk_cache_create);
   assert(note);

   unsigned build_id_len = build_id_length(note);
   assert(build_id_len == 20); /* sha1 */

   const uint8_t *id_sha1 = build_id_data(note);
   assert(id_sha1);

   _mesa_sha1_update(&sha1_ctx, id_sha1, build_id_len);
#endif

   /* When we switch the host the caps might change and then we might have to
    * apply different lowering. */
   _mesa_sha1_update(&sha1_ctx, &screen->caps, sizeof(screen->caps));

   uint8_t sha1[20];
   _mesa_sha1_final(&sha1_ctx, sha1);
   char timestamp[41];
   _mesa_sha1_format(timestamp, sha1);

   screen->disk_cache = disk_cache_create("virgl", timestamp, 0);
}

static bool
virgl_is_dmabuf_modifier_supported(UNUSED struct pipe_screen *pscreen,
                                   UNUSED uint64_t modifier,
                                   UNUSED enum pipe_format format,
                                   UNUSED bool *external_only)
{
   /* Always advertise support until virgl starts checking against host
    * virglrenderer or consuming valid non-linear modifiers here.
    */
   return true;
}

static unsigned int
virgl_get_dmabuf_modifier_planes(UNUSED struct pipe_screen *pscreen,
                                 UNUSED uint64_t modifier,
                                 enum pipe_format format)
{
   /* Return the format plane count queried from pipe_format. For virgl,
    * additional aux planes are entirely resolved on the host side.
    */
   return util_format_get_num_planes(format);
}

static void
fixup_renderer(union virgl_caps *caps)
{
   if (caps->v2.host_feature_check_version < 5)
      return;

   char renderer[64];
   int renderer_len = snprintf(renderer, sizeof(renderer), "virgl (%s)",
                               caps->v2.renderer);
   if (renderer_len >= 64) {
      memcpy(renderer + 59, "...)", 4);
      renderer_len = 63;
   }
   memcpy(caps->v2.renderer, renderer, renderer_len + 1);
}

static const void *
virgl_get_compiler_options(struct pipe_screen *pscreen,
                           enum pipe_shader_ir ir,
                           enum pipe_shader_type shader)
{
   struct virgl_screen *vscreen = virgl_screen(pscreen);

   return &vscreen->compiler_options;
}

static int
virgl_screen_get_fd(struct pipe_screen *pscreen)
{
   struct virgl_screen *vscreen = virgl_screen(pscreen);
   struct virgl_winsys *vws = vscreen->vws;

   if (vws->get_fd)
      return vws->get_fd(vws);
   else
      return -1;
}

struct pipe_screen *
virgl_create_screen(struct virgl_winsys *vws, const struct pipe_screen_config *config)
{
   struct virgl_screen *screen = CALLOC_STRUCT(virgl_screen);

   const char *VIRGL_GLES_EMULATE_BGRA = "gles_emulate_bgra";
   const char *VIRGL_GLES_APPLY_BGRA_DEST_SWIZZLE = "gles_apply_bgra_dest_swizzle";
   const char *VIRGL_GLES_SAMPLES_PASSED_VALUE = "gles_samples_passed_value";
   const char *VIRGL_FORMAT_L8_SRGB_ENABLE_READBACK = "format_l8_srgb_enable_readback";
   const char *VIRGL_SHADER_SYNC = "virgl_shader_sync";

   if (!screen)
      return NULL;

   virgl_debug = debug_get_option_virgl_debug();

   if (config && config->options) {
      driParseConfigFiles(config->options, config->options_info, 0, "virtio_gpu",
                          NULL, NULL, NULL, 0, NULL, 0);

      screen->tweak_gles_emulate_bgra =
            driQueryOptionb(config->options, VIRGL_GLES_EMULATE_BGRA);
      screen->tweak_gles_apply_bgra_dest_swizzle =
            driQueryOptionb(config->options, VIRGL_GLES_APPLY_BGRA_DEST_SWIZZLE);
      screen->tweak_gles_tf3_value =
            driQueryOptioni(config->options, VIRGL_GLES_SAMPLES_PASSED_VALUE);
      screen->tweak_l8_srgb_readback =
            driQueryOptionb(config->options, VIRGL_FORMAT_L8_SRGB_ENABLE_READBACK);
      screen->shader_sync = driQueryOptionb(config->options, VIRGL_SHADER_SYNC);
   }
   screen->tweak_gles_emulate_bgra &= !(virgl_debug & VIRGL_DEBUG_NO_EMULATE_BGRA);
   screen->tweak_gles_apply_bgra_dest_swizzle &= !(virgl_debug & VIRGL_DEBUG_NO_BGRA_DEST_SWIZZLE);
   screen->no_coherent = virgl_debug & VIRGL_DEBUG_NO_COHERENT;
   screen->tweak_l8_srgb_readback |= !!(virgl_debug & VIRGL_DEBUG_L8_SRGB_ENABLE_READBACK);
   screen->shader_sync |= !!(virgl_debug & VIRGL_DEBUG_SHADER_SYNC);

   screen->vws = vws;
   screen->base.get_name = virgl_get_name;
   screen->base.get_vendor = virgl_get_vendor;
   screen->base.get_screen_fd = virgl_screen_get_fd;
   screen->base.get_param = virgl_get_param;
   screen->base.get_shader_param = virgl_get_shader_param;
   screen->base.get_video_param = virgl_get_video_param;
   screen->base.get_compute_param = virgl_get_compute_param;
   screen->base.get_paramf = virgl_get_paramf;
   screen->base.get_compiler_options = virgl_get_compiler_options;
   screen->base.is_format_supported = virgl_is_format_supported;
   screen->base.is_video_format_supported = virgl_is_video_format_supported;
   screen->base.destroy = virgl_destroy_screen;
   screen->base.context_create = virgl_context_create;
   screen->base.flush_frontbuffer = virgl_flush_frontbuffer;
   screen->base.get_timestamp = u_default_get_timestamp;
   screen->base.fence_reference = virgl_fence_reference;
   //screen->base.fence_signalled = virgl_fence_signalled;
   screen->base.fence_finish = virgl_fence_finish;
   screen->base.fence_get_fd = virgl_fence_get_fd;
   screen->base.query_memory_info = virgl_query_memory_info;
   screen->base.get_disk_shader_cache = virgl_get_disk_shader_cache;
   screen->base.is_dmabuf_modifier_supported = virgl_is_dmabuf_modifier_supported;
   screen->base.get_dmabuf_modifier_planes = virgl_get_dmabuf_modifier_planes;

   virgl_init_screen_resource_functions(&screen->base);

   vws->get_caps(vws, &screen->caps);
   fixup_formats(&screen->caps.caps,
                 &screen->caps.caps.v2.supported_readback_formats);
   fixup_formats(&screen->caps.caps, &screen->caps.caps.v2.scanout);
   fixup_renderer(&screen->caps.caps);

   union virgl_caps *caps = &screen->caps.caps;
   screen->tweak_gles_emulate_bgra &= !virgl_format_check_bitmask(PIPE_FORMAT_B8G8R8A8_SRGB, caps->v1.render.bitmask, false);
   screen->refcnt = 1;

   /* Set up the NIR shader compiler options now that we've figured out the caps. */
   screen->compiler_options = *(nir_shader_compiler_options *)
      nir_to_tgsi_get_compiler_options(&screen->base, PIPE_SHADER_IR_NIR, PIPE_SHADER_FRAGMENT);
   if (virgl_get_param(&screen->base, PIPE_CAP_DOUBLES)) {
      /* virglrenderer is missing DFLR support, so avoid turning 64-bit
       * ffract+fsub back into ffloor.
       */
      screen->compiler_options.lower_ffloor = true;
      screen->compiler_options.lower_fneg = true;
   }
   screen->compiler_options.no_integers = screen->caps.caps.v1.glsl_level < 130;
   screen->compiler_options.lower_ffma32 = true;
   screen->compiler_options.fuse_ffma32 = false;
   screen->compiler_options.lower_ldexp = true;
   screen->compiler_options.lower_image_offset_to_range_base = true;
   screen->compiler_options.lower_atomic_offset_to_range_base = true;

   slab_create_parent(&screen->transfer_pool, sizeof(struct virgl_transfer), 16);

   virgl_disk_cache_create(screen);
   return &screen->base;
}