tor-browser

renderer11_utils.cpp (97657B)

---

//
// Copyright 2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// renderer11_utils.cpp: Conversion functions and other utility routines
// specific to the D3D11 renderer.

#include "libANGLE/renderer/d3d/d3d11/renderer11_utils.h"

#include <versionhelpers.h>
#include <algorithm>

#include "common/debug.h"
#include "libANGLE/Buffer.h"
#include "libANGLE/Context.h"
#include "libANGLE/Framebuffer.h"
#include "libANGLE/Program.h"
#include "libANGLE/State.h"
#include "libANGLE/VertexArray.h"
#include "libANGLE/formatutils.h"
#include "libANGLE/renderer/d3d/BufferD3D.h"
#include "libANGLE/renderer/d3d/FramebufferD3D.h"
#include "libANGLE/renderer/d3d/d3d11/Context11.h"
#include "libANGLE/renderer/d3d/d3d11/RenderTarget11.h"
#include "libANGLE/renderer/d3d/d3d11/Renderer11.h"
#include "libANGLE/renderer/d3d/d3d11/formatutils11.h"
#include "libANGLE/renderer/d3d/d3d11/texture_format_table.h"
#include "libANGLE/renderer/driver_utils.h"
#include "libANGLE/renderer/dxgi_support_table.h"
#include "platform/FeaturesD3D_autogen.h"
#include "platform/PlatformMethods.h"

namespace rx
{

namespace d3d11_gl
{
namespace
{
// TODO(xinghua.cao@intel.com): Get a more accurate limit.
static D3D_FEATURE_LEVEL kMinimumFeatureLevelForES31 = D3D_FEATURE_LEVEL_11_0;

// Helper functor for querying DXGI support. Saves passing the parameters repeatedly.
class DXGISupportHelper : angle::NonCopyable
{
 public:
   DXGISupportHelper(ID3D11Device *device, D3D_FEATURE_LEVEL featureLevel)
       : mDevice(device), mFeatureLevel(featureLevel)
   {}

   bool query(DXGI_FORMAT dxgiFormat, UINT supportMask)
   {
       if (dxgiFormat == DXGI_FORMAT_UNKNOWN)
           return false;

       auto dxgiSupport = d3d11::GetDXGISupport(dxgiFormat, mFeatureLevel);

       UINT supportedBits = dxgiSupport.alwaysSupportedFlags;

       if ((dxgiSupport.optionallySupportedFlags & supportMask) != 0)
       {
           UINT formatSupport;
           if (SUCCEEDED(mDevice->CheckFormatSupport(dxgiFormat, &formatSupport)))
           {
               supportedBits |= (formatSupport & supportMask);
           }
           else
           {
               // TODO(jmadill): find out why we fail this call sometimes in FL9_3
               // ERR() << "Error checking format support for format 0x" << std::hex << dxgiFormat;
           }
       }

       return ((supportedBits & supportMask) == supportMask);
   }

 private:
   ID3D11Device *mDevice;
   D3D_FEATURE_LEVEL mFeatureLevel;
};

gl::TextureCaps GenerateTextureFormatCaps(gl::Version maxClientVersion,
                                         GLenum internalFormat,
                                         ID3D11Device *device,
                                         const Renderer11DeviceCaps &renderer11DeviceCaps)
{
   gl::TextureCaps textureCaps;

   DXGISupportHelper support(device, renderer11DeviceCaps.featureLevel);
   const d3d11::Format &formatInfo = d3d11::Format::Get(internalFormat, renderer11DeviceCaps);

   const gl::InternalFormat &internalFormatInfo = gl::GetSizedInternalFormatInfo(internalFormat);

   UINT texSupportMask = D3D11_FORMAT_SUPPORT_TEXTURE2D;
   if (internalFormatInfo.depthBits == 0 && internalFormatInfo.stencilBits == 0)
   {
       texSupportMask |= D3D11_FORMAT_SUPPORT_TEXTURECUBE;
       if (maxClientVersion.major > 2)
       {
           texSupportMask |= D3D11_FORMAT_SUPPORT_TEXTURE3D;
       }
   }

   textureCaps.texturable = support.query(formatInfo.texFormat, texSupportMask);
   textureCaps.filterable =
       support.query(formatInfo.srvFormat, D3D11_FORMAT_SUPPORT_SHADER_SAMPLE);
   textureCaps.textureAttachment =
       (support.query(formatInfo.rtvFormat, D3D11_FORMAT_SUPPORT_RENDER_TARGET)) ||
       (support.query(formatInfo.dsvFormat, D3D11_FORMAT_SUPPORT_DEPTH_STENCIL));
   textureCaps.renderbuffer = textureCaps.textureAttachment;
   textureCaps.blendable    = textureCaps.renderbuffer;

   DXGI_FORMAT renderFormat = DXGI_FORMAT_UNKNOWN;
   if (formatInfo.dsvFormat != DXGI_FORMAT_UNKNOWN)
   {
       renderFormat = formatInfo.dsvFormat;
   }
   else if (formatInfo.rtvFormat != DXGI_FORMAT_UNKNOWN)
   {
       renderFormat = formatInfo.rtvFormat;
   }
   if (renderFormat != DXGI_FORMAT_UNKNOWN &&
       support.query(renderFormat, D3D11_FORMAT_SUPPORT_MULTISAMPLE_RENDERTARGET))
   {
       // Assume 1x
       textureCaps.sampleCounts.insert(1);

       for (unsigned int sampleCount = 2; sampleCount <= D3D11_MAX_MULTISAMPLE_SAMPLE_COUNT;
            sampleCount *= 2)
       {
           UINT qualityCount = 0;
           if (SUCCEEDED(device->CheckMultisampleQualityLevels(renderFormat, sampleCount,
                                                               &qualityCount)))
           {
               // Assume we always support lower sample counts
               if (qualityCount == 0)
               {
                   break;
               }
               textureCaps.sampleCounts.insert(sampleCount);
           }
       }
   }

   return textureCaps;
}

bool GetNPOTTextureSupport(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476876.aspx
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

float GetMaximumAnisotropy(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_MAX_MAXANISOTROPY;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_MAX_MAXANISOTROPY;

       // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476876.aspx
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
           return 16;

       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_DEFAULT_MAX_ANISOTROPY;

       default:
           UNREACHABLE();
           return 0;
   }
}

bool GetOcclusionQuerySupport(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476150.aspx
       // ID3D11Device::CreateQuery
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
           return true;
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetEventQuerySupport(D3D_FEATURE_LEVEL featureLevel)
{
   // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476150.aspx
   // ID3D11Device::CreateQuery

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return true;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetInstancingSupport(D3D_FEATURE_LEVEL featureLevel)
{
   // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476150.aspx
   // ID3D11Device::CreateInputLayout

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       // Feature Level 9_3 supports instancing, but slot 0 in the input layout must not be
       // instanced.
       // D3D9 has a similar restriction, where stream 0 must not be instanced.
       // This restriction can be worked around by remapping any non-instanced slot to slot
       // 0.
       // This works because HLSL uses shader semantics to match the vertex inputs to the
       // elements in the input layout, rather than the slots.
       // Note that we only support instancing via ANGLE_instanced_array on 9_3, since 9_3
       // doesn't support OpenGL ES 3.0
       case D3D_FEATURE_LEVEL_9_3:
           return true;

       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetFramebufferMultisampleSupport(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetFramebufferBlitSupport(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetDerivativeInstructionSupport(D3D_FEATURE_LEVEL featureLevel)
{
   // http://msdn.microsoft.com/en-us/library/windows/desktop/bb509588.aspx states that
   // shader model
   // ps_2_x is required for the ddx (and other derivative functions).

   // http://msdn.microsoft.com/en-us/library/windows/desktop/ff476876.aspx states that
   // feature level
   // 9.3 supports shader model ps_2_x.

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
       case D3D_FEATURE_LEVEL_9_3:
           return true;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

bool GetShaderTextureLODSupport(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return true;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return false;

       default:
           UNREACHABLE();
           return false;
   }
}

int GetMaximumSimultaneousRenderTargets(D3D_FEATURE_LEVEL featureLevel)
{
   // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476150.aspx
   // ID3D11Device::CreateInputLayout

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_SIMULTANEOUS_RENDER_TARGET_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_SIMULTANEOUS_RENDER_TARGET_COUNT;

       case D3D_FEATURE_LEVEL_9_3:
           return D3D_FL9_3_SIMULTANEOUS_RENDER_TARGET_COUNT;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_SIMULTANEOUS_RENDER_TARGET_COUNT;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximum2DTextureSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_TEXTURE2D_U_OR_V_DIMENSION;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_TEXTURE2D_U_OR_V_DIMENSION;

       case D3D_FEATURE_LEVEL_9_3:
           return D3D_FL9_3_REQ_TEXTURE2D_U_OR_V_DIMENSION;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_REQ_TEXTURE2D_U_OR_V_DIMENSION;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumCubeMapTextureSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_TEXTURECUBE_DIMENSION;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_TEXTURECUBE_DIMENSION;

       case D3D_FEATURE_LEVEL_9_3:
           return D3D_FL9_3_REQ_TEXTURECUBE_DIMENSION;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_REQ_TEXTURECUBE_DIMENSION;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximum2DTextureArraySize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_TEXTURE2D_ARRAY_AXIS_DIMENSION;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_TEXTURE2D_ARRAY_AXIS_DIMENSION;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximum3DTextureSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_TEXTURE3D_U_V_OR_W_DIMENSION;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_TEXTURE3D_U_V_OR_W_DIMENSION;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_REQ_TEXTURE3D_U_V_OR_W_DIMENSION;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumViewportSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_VIEWPORT_BOUNDS_MAX;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_VIEWPORT_BOUNDS_MAX;

       // No constants for D3D11 Feature Level 9 viewport size limits, use the maximum
       // texture sizes
       case D3D_FEATURE_LEVEL_9_3:
           return D3D_FL9_3_REQ_TEXTURE2D_U_OR_V_DIMENSION;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_REQ_TEXTURE2D_U_OR_V_DIMENSION;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumDrawIndexedIndexCount(D3D_FEATURE_LEVEL featureLevel)
{
   // D3D11 allows up to 2^32 elements, but we report max signed int for convenience since
   // that's what's
   // returned from glGetInteger
   static_assert(D3D11_REQ_DRAWINDEXED_INDEX_COUNT_2_TO_EXP == 32,
                 "Unexpected D3D11 constant value.");
   static_assert(D3D10_REQ_DRAWINDEXED_INDEX_COUNT_2_TO_EXP == 32,
                 "Unexpected D3D11 constant value.");

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return std::numeric_limits<GLint>::max();

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
           return D3D_FL9_2_IA_PRIMITIVE_MAX_COUNT;
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_IA_PRIMITIVE_MAX_COUNT;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumDrawVertexCount(D3D_FEATURE_LEVEL featureLevel)
{
   // D3D11 allows up to 2^32 elements, but we report max signed int for convenience since
   // that's what's
   // returned from glGetInteger
   static_assert(D3D11_REQ_DRAW_VERTEX_COUNT_2_TO_EXP == 32, "Unexpected D3D11 constant value.");
   static_assert(D3D10_REQ_DRAW_VERTEX_COUNT_2_TO_EXP == 32, "Unexpected D3D11 constant value.");

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return std::numeric_limits<GLint>::max();

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
           return D3D_FL9_2_IA_PRIMITIVE_MAX_COUNT;
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_IA_PRIMITIVE_MAX_COUNT;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumVertexInputSlots(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_STANDARD_VERTEX_ELEMENT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
           return D3D10_1_STANDARD_VERTEX_ELEMENT_COUNT;
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_STANDARD_VERTEX_ELEMENT_COUNT;

       // From http://http://msdn.microsoft.com/en-us/library/windows/desktop/ff476876.aspx
       // "Max Input Slots"
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 16;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumVertexUniformVectors(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_CONSTANT_BUFFER_ELEMENT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_CONSTANT_BUFFER_ELEMENT_COUNT;

       // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476149.aspx
       // ID3D11DeviceContext::VSSetConstantBuffers
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 255 - d3d11_gl::GetReservedVertexUniformVectors(featureLevel);

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumVertexUniformBlocks(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_CONSTANT_BUFFER_API_SLOT_COUNT -
                  d3d11::RESERVED_CONSTANT_BUFFER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_COMMONSHADER_CONSTANT_BUFFER_API_SLOT_COUNT -
                  d3d11::RESERVED_CONSTANT_BUFFER_SLOT_COUNT;

       // Uniform blocks not supported on D3D11 Feature Level 9
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetReservedVertexOutputVectors(D3D_FEATURE_LEVEL featureLevel)
{
   // According to The OpenGL ES Shading Language specifications
   // (Language Version 1.00 section 10.16, Language Version 3.10 section 12.21)
   // built-in special variables (e.g. gl_FragCoord, or gl_PointCoord)
   // which are statically used in the shader should be included in the variable packing
   // algorithm.
   // Therefore, we should not reserve output vectors for them.

   switch (featureLevel)
   {
       // We must reserve one output vector for dx_Position.
       // We also reserve one for gl_Position, which we unconditionally output on Feature
       // Levels 10_0+,
       // even if it's unused in the shader (e.g. for transform feedback). TODO: This could
       // be improved.
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 2;

       // Just reserve dx_Position on Feature Level 9, since we don't ever need to output
       // gl_Position.
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 1;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumVertexOutputVectors(D3D_FEATURE_LEVEL featureLevel)
{
   static_assert(gl::IMPLEMENTATION_MAX_VARYING_VECTORS == D3D11_VS_OUTPUT_REGISTER_COUNT,
                 "Unexpected D3D11 constant value.");

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_VS_OUTPUT_REGISTER_COUNT - GetReservedVertexOutputVectors(featureLevel);

       case D3D_FEATURE_LEVEL_10_1:
           return D3D10_1_VS_OUTPUT_REGISTER_COUNT - GetReservedVertexOutputVectors(featureLevel);
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_VS_OUTPUT_REGISTER_COUNT - GetReservedVertexOutputVectors(featureLevel);

       // Use Shader Model 2.X limits
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 8 - GetReservedVertexOutputVectors(featureLevel);

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumVertexTextureUnits(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_SAMPLER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_COMMONSHADER_SAMPLER_SLOT_COUNT;

       // Vertex textures not supported on D3D11 Feature Level 9 according to
       // http://msdn.microsoft.com/en-us/library/windows/desktop/ff476149.aspx
       // ID3D11DeviceContext::VSSetSamplers and ID3D11DeviceContext::VSSetShaderResources
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumPixelUniformVectors(D3D_FEATURE_LEVEL featureLevel)
{
   // TODO(geofflang): Remove hard-coded limit once the gl-uniform-arrays test can pass
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return 1024;  // D3D11_REQ_CONSTANT_BUFFER_ELEMENT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 1024;  // D3D10_REQ_CONSTANT_BUFFER_ELEMENT_COUNT;

       // From http://msdn.microsoft.com/en-us/library/windows/desktop/ff476149.aspx
       // ID3D11DeviceContext::PSSetConstantBuffers
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 32 - d3d11_gl::GetReservedFragmentUniformVectors(featureLevel);

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumPixelUniformBlocks(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_CONSTANT_BUFFER_API_SLOT_COUNT -
                  d3d11::RESERVED_CONSTANT_BUFFER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_COMMONSHADER_CONSTANT_BUFFER_API_SLOT_COUNT -
                  d3d11::RESERVED_CONSTANT_BUFFER_SLOT_COUNT;

       // Uniform blocks not supported on D3D11 Feature Level 9
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumPixelInputVectors(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_PS_INPUT_REGISTER_COUNT - GetReservedVertexOutputVectors(featureLevel);

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_PS_INPUT_REGISTER_COUNT - GetReservedVertexOutputVectors(featureLevel);

       // Use Shader Model 2.X limits
       case D3D_FEATURE_LEVEL_9_3:
           return 8 - GetReservedVertexOutputVectors(featureLevel);
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 8 - GetReservedVertexOutputVectors(featureLevel);

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumPixelTextureUnits(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_SAMPLER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_COMMONSHADER_SAMPLER_SLOT_COUNT;

       // http://msdn.microsoft.com/en-us/library/windows/desktop/ff476149.aspx
       // ID3D11DeviceContext::PSSetShaderResources
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 16;

       default:
           UNREACHABLE();
           return 0;
   }
}

std::array<GLint, 3> GetMaxComputeWorkGroupCount(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return {{D3D11_CS_DISPATCH_MAX_THREAD_GROUPS_PER_DIMENSION,
                    D3D11_CS_DISPATCH_MAX_THREAD_GROUPS_PER_DIMENSION,
                    D3D11_CS_DISPATCH_MAX_THREAD_GROUPS_PER_DIMENSION}};
       default:
           return {{0, 0, 0}};
   }
}

std::array<GLint, 3> GetMaxComputeWorkGroupSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return {{D3D11_CS_THREAD_GROUP_MAX_X, D3D11_CS_THREAD_GROUP_MAX_Y,
                    D3D11_CS_THREAD_GROUP_MAX_Z}};
       default:
           return {{0, 0, 0}};
   }
}

int GetMaxComputeWorkGroupInvocations(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_CS_THREAD_GROUP_MAX_THREADS_PER_GROUP;
       default:
           return 0;
   }
}

int GetMaxComputeSharedMemorySize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       // In D3D11 the maximum total size of all variables with the groupshared storage class is
       // 32kb.
       // https://docs.microsoft.com/en-us/windows/desktop/direct3dhlsl/dx-graphics-hlsl-variable-syntax
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return 32768;
       default:
           return 0;
   }
}

int GetMaximumComputeUniformVectors(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_CONSTANT_BUFFER_ELEMENT_COUNT;
       default:
           return 0;
   }
}

int GetMaximumComputeUniformBlocks(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_CONSTANT_BUFFER_API_SLOT_COUNT -
                  d3d11::RESERVED_CONSTANT_BUFFER_SLOT_COUNT;
       default:
           return 0;
   }
}

int GetMaximumComputeTextureUnits(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_SAMPLER_SLOT_COUNT;
       default:
           return 0;
   }
}

void SetUAVRelatedResourceLimits(D3D_FEATURE_LEVEL featureLevel, gl::Caps *caps)
{
   ASSERT(caps);

   GLuint reservedUAVsForAtomicCounterBuffers = 0u;

   // For pixel shaders, the render targets and unordered access views share the same resource
   // slots when being written out.
   // https://msdn.microsoft.com/en-us/library/windows/desktop/ff476465(v=vs.85).aspx
   GLuint maxNumRTVsAndUAVs = 0u;

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
           // Currently we allocate 4 UAV slots for atomic counter buffers on feature level 11_1.
           reservedUAVsForAtomicCounterBuffers = 4u;
           maxNumRTVsAndUAVs                   = D3D11_1_UAV_SLOT_COUNT;
           break;
       case D3D_FEATURE_LEVEL_11_0:
           // Currently we allocate 1 UAV slot for atomic counter buffers on feature level 11_0.
           reservedUAVsForAtomicCounterBuffers = 1u;
           maxNumRTVsAndUAVs                   = D3D11_PS_CS_UAV_REGISTER_COUNT;
           break;
       default:
           return;
   }

   // Set limits on atomic counter buffers in fragment shaders and compute shaders.
   caps->maxCombinedAtomicCounterBuffers = reservedUAVsForAtomicCounterBuffers;
   caps->maxShaderAtomicCounterBuffers[gl::ShaderType::Compute] =
       reservedUAVsForAtomicCounterBuffers;
   caps->maxShaderAtomicCounterBuffers[gl::ShaderType::Fragment] =
       reservedUAVsForAtomicCounterBuffers;
   caps->maxAtomicCounterBufferBindings = reservedUAVsForAtomicCounterBuffers;

   // Setting MAX_COMPUTE_ATOMIC_COUNTERS to a conservative number of 1024 * the number of UAV
   // reserved for atomic counters. It could theoretically be set to max buffer size / 4 but that
   // number could cause problems.
   caps->maxCombinedAtomicCounters = reservedUAVsForAtomicCounterBuffers * 1024;
   caps->maxShaderAtomicCounters[gl::ShaderType::Compute] = caps->maxCombinedAtomicCounters;

   // See
   // https://docs.microsoft.com/en-us/windows/desktop/direct3d11/overviews-direct3d-11-resources-limits
   // Resource size (in MB) for any of the preceding resources is min(max(128,0.25f * (amount of
   // dedicated VRAM)), 2048) MB. So we set it to 128MB to keep same with GL backend.
   caps->maxShaderStorageBlockSize =
       D3D11_REQ_RESOURCE_SIZE_IN_MEGABYTES_EXPRESSION_A_TERM * 1024 * 1024;

   // Allocate the remaining slots for images and shader storage blocks.
   // The maximum number of fragment shader outputs depends on the current context version, so we
   // will not set it here. See comments in Context11::initialize().
   caps->maxCombinedShaderOutputResources =
       maxNumRTVsAndUAVs - reservedUAVsForAtomicCounterBuffers;

   // Set limits on images and shader storage blocks in fragment shaders and compute shaders.
   caps->maxCombinedShaderStorageBlocks                   = caps->maxCombinedShaderOutputResources;
   caps->maxShaderStorageBlocks[gl::ShaderType::Compute]  = caps->maxCombinedShaderOutputResources;
   caps->maxShaderStorageBlocks[gl::ShaderType::Fragment] = caps->maxCombinedShaderOutputResources;
   caps->maxShaderStorageBufferBindings                   = caps->maxCombinedShaderOutputResources;

   caps->maxImageUnits                                    = caps->maxCombinedShaderOutputResources;
   caps->maxCombinedImageUniforms                         = caps->maxCombinedShaderOutputResources;
   caps->maxShaderImageUniforms[gl::ShaderType::Compute]  = caps->maxCombinedShaderOutputResources;
   caps->maxShaderImageUniforms[gl::ShaderType::Fragment] = caps->maxCombinedShaderOutputResources;

   // On feature level 11_1, UAVs are also available in vertex shaders and geometry shaders.
   if (featureLevel == D3D_FEATURE_LEVEL_11_1)
   {
       caps->maxShaderAtomicCounterBuffers[gl::ShaderType::Vertex] =
           caps->maxCombinedAtomicCounterBuffers;
       caps->maxShaderAtomicCounterBuffers[gl::ShaderType::Geometry] =
           caps->maxCombinedAtomicCounterBuffers;

       caps->maxShaderImageUniforms[gl::ShaderType::Vertex] =
           caps->maxCombinedShaderOutputResources;
       caps->maxShaderStorageBlocks[gl::ShaderType::Vertex] =
           caps->maxCombinedShaderOutputResources;
       caps->maxShaderImageUniforms[gl::ShaderType::Geometry] =
           caps->maxCombinedShaderOutputResources;
       caps->maxShaderStorageBlocks[gl::ShaderType::Geometry] =
           caps->maxCombinedShaderOutputResources;
   }
}

int GetMinimumTexelOffset(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_TEXEL_OFFSET_MAX_NEGATIVE;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_COMMONSHADER_TEXEL_OFFSET_MAX_NEGATIVE;

       // Sampling functions with offsets are not available below shader model 4.0.
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumTexelOffset(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_COMMONSHADER_TEXEL_OFFSET_MAX_POSITIVE;
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D11_COMMONSHADER_TEXEL_OFFSET_MAX_POSITIVE;

       // Sampling functions with offsets are not available below shader model 4.0.
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMinimumTextureGatherOffset(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       // https://docs.microsoft.com/en-us/windows/desktop/direct3dhlsl/gather4-po--sm5---asm-
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return -32;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumTextureGatherOffset(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       // https://docs.microsoft.com/en-us/windows/desktop/direct3dhlsl/gather4-po--sm5---asm-
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return 31;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

size_t GetMaximumConstantBufferSize(D3D_FEATURE_LEVEL featureLevel)
{
   // Returns a size_t despite the limit being a GLuint64 because size_t is the maximum
   // size of
   // any buffer that could be allocated.

   const size_t bytesPerComponent = 4 * sizeof(float);

   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_CONSTANT_BUFFER_ELEMENT_COUNT * bytesPerComponent;

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_CONSTANT_BUFFER_ELEMENT_COUNT * bytesPerComponent;

       // Limits from http://msdn.microsoft.com/en-us/library/windows/desktop/ff476501.aspx
       // remarks section
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 4096 * bytesPerComponent;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumStreamOutputBuffers(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_SO_BUFFER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_10_1:
           return D3D10_1_SO_BUFFER_SLOT_COUNT;
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_SO_BUFFER_SLOT_COUNT;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumStreamOutputInterleavedComponents(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:

       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return GetMaximumVertexOutputVectors(featureLevel) * 4;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumStreamOutputSeparateComponents(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return GetMaximumStreamOutputInterleavedComponents(featureLevel) /
                  GetMaximumStreamOutputBuffers(featureLevel);

       // D3D 10 and 10.1 only allow one output per output slot if an output slot other
       // than zero is used.
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 4;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;

       default:
           UNREACHABLE();
           return 0;
   }
}

int GetMaximumRenderToBufferWindowSize(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_REQ_RENDER_TO_BUFFER_WINDOW_WIDTH;
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return D3D10_REQ_RENDER_TO_BUFFER_WINDOW_WIDTH;

       // REQ_RENDER_TO_BUFFER_WINDOW_WIDTH not supported on D3D11 Feature Level 9,
       // use the maximum texture sizes
       case D3D_FEATURE_LEVEL_9_3:
           return D3D_FL9_3_REQ_TEXTURE2D_U_OR_V_DIMENSION;
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return D3D_FL9_1_REQ_TEXTURE2D_U_OR_V_DIMENSION;

       default:
           UNREACHABLE();
           return 0;
   }
}

IntelDriverVersion GetIntelDriverVersion(const Optional<LARGE_INTEGER> driverVersion)
{
   if (!driverVersion.valid())
       return IntelDriverVersion(0);

   DWORD lowPart = driverVersion.value().LowPart;
   return IntelDriverVersion(HIWORD(lowPart) * 10000 + LOWORD(lowPart));
}

}  // anonymous namespace

unsigned int GetReservedVertexUniformVectors(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 0;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 3;  // dx_ViewAdjust, dx_ViewCoords and dx_ViewScale

       default:
           UNREACHABLE();
           return 0;
   }
}

unsigned int GetReservedFragmentUniformVectors(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 0;

       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 4;  // dx_ViewCoords, dx_DepthFront, dx_DepthRange, dx_FragCoordOffset

       default:
           UNREACHABLE();
           return 0;
   }
}

gl::Version GetMaximumClientVersion(const Renderer11DeviceCaps &caps)
{
   switch (caps.featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return gl::Version(3, 1);
       case D3D_FEATURE_LEVEL_10_1:
           return gl::Version(3, 0);

       case D3D_FEATURE_LEVEL_10_0:
           if (caps.allowES3OnFL10_0)
           {
               return gl::Version(3, 0);
           }
           else
           {
               return gl::Version(2, 0);
           }
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return gl::Version(2, 0);

       default:
           UNREACHABLE();
           return gl::Version(0, 0);
   }
}

D3D_FEATURE_LEVEL GetMinimumFeatureLevelForES31()
{
   return kMinimumFeatureLevelForES31;
}

unsigned int GetMaxViewportAndScissorRectanglesPerPipeline(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return D3D11_VIEWPORT_AND_SCISSORRECT_OBJECT_COUNT_PER_PIPELINE;
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 1;
       default:
           UNREACHABLE();
           return 0;
   }
}

bool IsMultiviewSupported(D3D_FEATURE_LEVEL featureLevel)
{
   // The ANGLE_multiview extension can always be supported in D3D11 through geometry shaders.
   switch (featureLevel)
   {
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
           return true;
       default:
           return false;
   }
}

int GetMaxSampleMaskWords(D3D_FEATURE_LEVEL featureLevel)
{
   switch (featureLevel)
   {
       // D3D10+ only allows 1 sample mask.
       case D3D_FEATURE_LEVEL_11_1:
       case D3D_FEATURE_LEVEL_11_0:
       case D3D_FEATURE_LEVEL_10_1:
       case D3D_FEATURE_LEVEL_10_0:
           return 1;
       case D3D_FEATURE_LEVEL_9_3:
       case D3D_FEATURE_LEVEL_9_2:
       case D3D_FEATURE_LEVEL_9_1:
           return 0;
       default:
           UNREACHABLE();
           return 0;
   }
}

bool HasTextureBufferSupport(ID3D11Device *device, const Renderer11DeviceCaps &renderer11DeviceCaps)
{
   if (renderer11DeviceCaps.featureLevel < D3D_FEATURE_LEVEL_11_0)
       return false;

   if (!renderer11DeviceCaps.supportsTypedUAVLoadAdditionalFormats)
       return false;

   // https://docs.microsoft.com/en-us/windows/win32/direct3d12/typed-unordered-access-view-loads
   // we don't need to check the typed store. from the spec,
   // https://microsoft.github.io/DirectX-Specs/d3d/archive/D3D11_3_FunctionalSpec.htm#FormatList
   // all the following format support typed stored.
   // According to spec,
   // https://www.khronos.org/registry/OpenGL-Refpages/es3/html/glBindImageTexture.xhtml the
   // required image unit format are GL_RGBA32F, GL_RGBA32UI, GL_RGBA32I, GL_RGBA16F, GL_RGBA16UI,
   // GL_RGBA16I, GL_RGBA8, GL_RGBAUI, GL_RGBA8I, GL_RGBA8_SNORM, GL_R32F, GL_R32UI, GL_R32I,
   const std::array<DXGI_FORMAT, 2> &optionalFormats = {
       DXGI_FORMAT_R32G32B32A32_FLOAT,  // test for GL_RGBA32(UIF), GL_RGBA16(UIF),
                                        // GL_RGBA8(UIUnorm)
       DXGI_FORMAT_R8G8B8A8_SNORM,      // test for GL_RGBA8_SNORM,
   };

   for (DXGI_FORMAT dxgiFormat : optionalFormats)
   {
       D3D11_FEATURE_DATA_FORMAT_SUPPORT FormatSupport = {dxgiFormat, 0};
       if (!SUCCEEDED(device->CheckFeatureSupport(D3D11_FEATURE_FORMAT_SUPPORT, &FormatSupport,
                                                  sizeof(FormatSupport))))
       {
           WARN() << "Error checking typed load support for format 0x" << std::hex << dxgiFormat;
           return false;
       }
       if ((FormatSupport.OutFormatSupport & D3D11_FORMAT_SUPPORT2_UAV_TYPED_LOAD) == 0)
           return false;
   }
   return true;
}

void GenerateCaps(ID3D11Device *device,
                 ID3D11DeviceContext *deviceContext,
                 const Renderer11DeviceCaps &renderer11DeviceCaps,
                 const angle::FeaturesD3D &features,
                 const char *description,
                 gl::Caps *caps,
                 gl::TextureCapsMap *textureCapsMap,
                 gl::Extensions *extensions,
                 gl::Limitations *limitations)
{
   D3D_FEATURE_LEVEL featureLevel  = renderer11DeviceCaps.featureLevel;
   const gl::FormatSet &allFormats = gl::GetAllSizedInternalFormats();
   for (GLenum internalFormat : allFormats)
   {
       gl::TextureCaps textureCaps =
           GenerateTextureFormatCaps(GetMaximumClientVersion(renderer11DeviceCaps), internalFormat,
                                     device, renderer11DeviceCaps);
       textureCapsMap->insert(internalFormat, textureCaps);
   }

   // GL core feature limits
   // Reserve MAX_UINT for D3D11's primitive restart.
   caps->maxElementIndex  = static_cast<GLint64>(std::numeric_limits<unsigned int>::max() - 1);
   caps->max3DTextureSize = GetMaximum3DTextureSize(featureLevel);
   caps->max2DTextureSize = GetMaximum2DTextureSize(featureLevel);
   caps->maxCubeMapTextureSize = GetMaximumCubeMapTextureSize(featureLevel);
   caps->maxArrayTextureLayers = GetMaximum2DTextureArraySize(featureLevel);

   // Unimplemented, set to minimum required
   caps->maxLODBias = 2.0f;

   // No specific limits on render target size, maximum 2D texture size is equivalent
   caps->maxRenderbufferSize = caps->max2DTextureSize;

   // Maximum draw buffers and color attachments are the same, max color attachments could
   // eventually be increased to 16
   caps->maxDrawBuffers      = GetMaximumSimultaneousRenderTargets(featureLevel);
   caps->maxColorAttachments = GetMaximumSimultaneousRenderTargets(featureLevel);

   // D3D11 has the same limit for viewport width and height
   caps->maxViewportWidth  = GetMaximumViewportSize(featureLevel);
   caps->maxViewportHeight = caps->maxViewportWidth;

   // Choose a reasonable maximum, enforced in the shader.
   caps->minAliasedPointSize = 1.0f;
   caps->maxAliasedPointSize = 1024.0f;

   // Wide lines not supported
   caps->minAliasedLineWidth = 1.0f;
   caps->maxAliasedLineWidth = 1.0f;

   // Primitive count limits
   caps->maxElementsIndices  = GetMaximumDrawIndexedIndexCount(featureLevel);
   caps->maxElementsVertices = GetMaximumDrawVertexCount(featureLevel);

   // Program and shader binary formats (no supported shader binary formats)
   caps->programBinaryFormats.push_back(GL_PROGRAM_BINARY_ANGLE);

   caps->vertexHighpFloat.setIEEEFloat();
   caps->vertexMediumpFloat.setIEEEFloat();
   caps->vertexLowpFloat.setIEEEFloat();
   caps->fragmentHighpFloat.setIEEEFloat();
   caps->fragmentMediumpFloat.setIEEEFloat();
   caps->fragmentLowpFloat.setIEEEFloat();

   // 32-bit integers are natively supported
   caps->vertexHighpInt.setTwosComplementInt(32);
   caps->vertexMediumpInt.setTwosComplementInt(32);
   caps->vertexLowpInt.setTwosComplementInt(32);
   caps->fragmentHighpInt.setTwosComplementInt(32);
   caps->fragmentMediumpInt.setTwosComplementInt(32);
   caps->fragmentLowpInt.setTwosComplementInt(32);

   // We do not wait for server fence objects internally, so report a max timeout of zero.
   caps->maxServerWaitTimeout = 0;

   // Vertex shader limits
   caps->maxVertexAttributes     = GetMaximumVertexInputSlots(featureLevel);
   caps->maxVertexUniformVectors = GetMaximumVertexUniformVectors(featureLevel);
   if (features.skipVSConstantRegisterZero.enabled)
   {
       caps->maxVertexUniformVectors -= 1;
   }
   caps->maxShaderUniformComponents[gl::ShaderType::Vertex] = caps->maxVertexUniformVectors * 4;
   caps->maxShaderUniformBlocks[gl::ShaderType::Vertex] =
       GetMaximumVertexUniformBlocks(featureLevel);
   caps->maxVertexOutputComponents = GetMaximumVertexOutputVectors(featureLevel) * 4;
   caps->maxShaderTextureImageUnits[gl::ShaderType::Vertex] =
       GetMaximumVertexTextureUnits(featureLevel);

   // Vertex Attribute Bindings are emulated on D3D11.
   caps->maxVertexAttribBindings = caps->maxVertexAttributes;
   // Experimental testing confirmed there is no explicit limit on maximum buffer offset in D3D11.
   caps->maxVertexAttribRelativeOffset = std::numeric_limits<GLint>::max();
   // Experimental testing confirmed 2048 is the maximum stride that D3D11 can support on all
   // platforms.
   caps->maxVertexAttribStride = 2048;

   // Fragment shader limits
   caps->maxFragmentUniformVectors = GetMaximumPixelUniformVectors(featureLevel);
   caps->maxShaderUniformComponents[gl::ShaderType::Fragment] =
       caps->maxFragmentUniformVectors * 4;
   caps->maxShaderUniformBlocks[gl::ShaderType::Fragment] =
       GetMaximumPixelUniformBlocks(featureLevel);
   caps->maxFragmentInputComponents = GetMaximumPixelInputVectors(featureLevel) * 4;
   caps->maxShaderTextureImageUnits[gl::ShaderType::Fragment] =
       GetMaximumPixelTextureUnits(featureLevel);
   caps->minProgramTexelOffset = GetMinimumTexelOffset(featureLevel);
   caps->maxProgramTexelOffset = GetMaximumTexelOffset(featureLevel);

   // Compute shader limits
   caps->maxComputeWorkGroupCount       = GetMaxComputeWorkGroupCount(featureLevel);
   caps->maxComputeWorkGroupSize        = GetMaxComputeWorkGroupSize(featureLevel);
   caps->maxComputeWorkGroupInvocations = GetMaxComputeWorkGroupInvocations(featureLevel);
   caps->maxComputeSharedMemorySize     = GetMaxComputeSharedMemorySize(featureLevel);
   caps->maxShaderUniformComponents[gl::ShaderType::Compute] =
       GetMaximumComputeUniformVectors(featureLevel) * 4;
   caps->maxShaderUniformBlocks[gl::ShaderType::Compute] =
       GetMaximumComputeUniformBlocks(featureLevel);
   caps->maxShaderTextureImageUnits[gl::ShaderType::Compute] =
       GetMaximumComputeTextureUnits(featureLevel);

   SetUAVRelatedResourceLimits(featureLevel, caps);

   // Aggregate shader limits
   caps->maxUniformBufferBindings = caps->maxShaderUniformBlocks[gl::ShaderType::Vertex] +
                                    caps->maxShaderUniformBlocks[gl::ShaderType::Fragment];
   caps->maxUniformBlockSize = static_cast<GLuint64>(GetMaximumConstantBufferSize(featureLevel));

   // TODO(oetuaho): Get a more accurate limit. For now using the minimum requirement for GLES 3.1.
   caps->maxUniformLocations = 1024;

   // With DirectX 11.1, constant buffer offset and size must be a multiple of 16 constants of 16
   // bytes each.
   // https://msdn.microsoft.com/en-us/library/windows/desktop/hh404649%28v=vs.85%29.aspx
   // With DirectX 11.0, we emulate UBO offsets using copies of ranges of the UBO however
   // we still keep the same alignment as 11.1 for consistency.
   caps->uniformBufferOffsetAlignment = 256;

   caps->maxCombinedUniformBlocks = caps->maxShaderUniformBlocks[gl::ShaderType::Vertex] +
                                    caps->maxShaderUniformBlocks[gl::ShaderType::Fragment];

   // A shader storage block will be translated to a structure in HLSL. So We reference the HLSL
   // structure packing rules
   // https://msdn.microsoft.com/en-us/library/windows/desktop/bb509632(v=vs.85).aspx. The
   // resulting size of any structure will always be evenly divisible by sizeof(four-component
   // vector).
   caps->shaderStorageBufferOffsetAlignment = 16;

   for (gl::ShaderType shaderType : gl::AllShaderTypes())
   {
       caps->maxCombinedShaderUniformComponents[shaderType] =
           static_cast<GLint64>(caps->maxShaderUniformBlocks[shaderType]) *
               static_cast<GLint64>(caps->maxUniformBlockSize / 4) +
           static_cast<GLint64>(caps->maxShaderUniformComponents[shaderType]);
   }

   caps->maxVaryingComponents         = GetMaximumVertexOutputVectors(featureLevel) * 4;
   caps->maxVaryingVectors            = GetMaximumVertexOutputVectors(featureLevel);
   caps->maxCombinedTextureImageUnits = caps->maxShaderTextureImageUnits[gl::ShaderType::Vertex] +
                                        caps->maxShaderTextureImageUnits[gl::ShaderType::Fragment];

   // Transform feedback limits
   caps->maxTransformFeedbackInterleavedComponents =
       GetMaximumStreamOutputInterleavedComponents(featureLevel);
   caps->maxTransformFeedbackSeparateAttributes = GetMaximumStreamOutputBuffers(featureLevel);
   caps->maxTransformFeedbackSeparateComponents =
       GetMaximumStreamOutputSeparateComponents(featureLevel);

   // Defer the computation of multisample limits to Context::updateCaps() where max*Samples values
   // are determined according to available sample counts for each individual format.
   caps->maxSamples             = std::numeric_limits<GLint>::max();
   caps->maxColorTextureSamples = std::numeric_limits<GLint>::max();
   caps->maxDepthTextureSamples = std::numeric_limits<GLint>::max();
   caps->maxIntegerSamples      = std::numeric_limits<GLint>::max();

   // Sample mask words limits
   caps->maxSampleMaskWords = GetMaxSampleMaskWords(featureLevel);

   // Framebuffer limits
   caps->maxFramebufferSamples = std::numeric_limits<GLint>::max();
   caps->maxFramebufferWidth   = GetMaximumRenderToBufferWindowSize(featureLevel);
   caps->maxFramebufferHeight  = caps->maxFramebufferWidth;

   // Texture gather offset limits
   caps->minProgramTextureGatherOffset = GetMinimumTextureGatherOffset(featureLevel);
   caps->maxProgramTextureGatherOffset = GetMaximumTextureGatherOffset(featureLevel);

   caps->maxTextureAnisotropy        = GetMaximumAnisotropy(featureLevel);
   caps->queryCounterBitsTimeElapsed = 64;
   caps->queryCounterBitsTimestamp = 0;  // Timestamps cannot be supported due to D3D11 limitations
   caps->maxDualSourceDrawBuffers  = 1;

   // GL extension support
   extensions->setTextureExtensionSupport(*textureCapsMap);

   // Explicitly disable GL_OES_compressed_ETC1_RGB8_texture because it's emulated and never
   // becomes core. WebGL doesn't want to expose it unless there is native support.
   extensions->compressedETC1RGB8TextureOES    = false;
   extensions->compressedETC1RGB8SubTextureEXT = false;

   extensions->elementIndexUintOES = true;
   extensions->getProgramBinaryOES = true;
   extensions->rgb8Rgba8OES        = true;
   extensions->readFormatBgraEXT   = true;
   extensions->pixelBufferObjectNV = true;
   extensions->mapbufferOES        = true;
   extensions->mapBufferRangeEXT   = true;
   extensions->textureNpotOES      = GetNPOTTextureSupport(featureLevel);
   extensions->drawBuffersEXT      = GetMaximumSimultaneousRenderTargets(featureLevel) > 1;
   extensions->drawBuffersIndexedEXT =
       (renderer11DeviceCaps.featureLevel >= D3D_FEATURE_LEVEL_10_1);
   extensions->drawBuffersIndexedOES       = extensions->drawBuffersIndexedEXT;
   extensions->textureStorageEXT           = true;
   extensions->textureFilterAnisotropicEXT = true;
   extensions->occlusionQueryBooleanEXT    = GetOcclusionQuerySupport(featureLevel);
   extensions->fenceNV                     = GetEventQuerySupport(featureLevel);
   extensions->disjointTimerQueryEXT       = true;
   extensions->robustnessEXT               = true;
   // Direct3D guarantees to return zero for any resource that is accessed out of bounds.
   // See https://msdn.microsoft.com/en-us/library/windows/desktop/ff476332(v=vs.85).aspx
   // and https://msdn.microsoft.com/en-us/library/windows/desktop/ff476900(v=vs.85).aspx
   extensions->robustBufferAccessBehaviorKHR = true;
   extensions->blendMinmaxEXT                = true;
   // https://docs.microsoft.com/en-us/windows/desktop/direct3ddxgi/format-support-for-direct3d-11-0-feature-level-hardware
   extensions->floatBlendEXT               = true;
   extensions->framebufferBlitANGLE        = GetFramebufferBlitSupport(featureLevel);
   extensions->framebufferBlitNV           = extensions->framebufferBlitANGLE;
   extensions->framebufferMultisampleANGLE = GetFramebufferMultisampleSupport(featureLevel);
   extensions->instancedArraysANGLE        = GetInstancingSupport(featureLevel);
   extensions->instancedArraysEXT          = GetInstancingSupport(featureLevel);
   extensions->packReverseRowOrderANGLE    = true;
   extensions->standardDerivativesOES      = GetDerivativeInstructionSupport(featureLevel);
   extensions->shaderTextureLodEXT         = GetShaderTextureLODSupport(featureLevel);
   extensions->fragDepthEXT                = true;
   extensions->multiviewOVR                = IsMultiviewSupported(featureLevel);
   extensions->multiview2OVR               = IsMultiviewSupported(featureLevel);
   if (extensions->multiviewOVR || extensions->multiview2OVR)
   {
       caps->maxViews = std::min(static_cast<GLuint>(GetMaximum2DTextureArraySize(featureLevel)),
                                 GetMaxViewportAndScissorRectanglesPerPipeline(featureLevel));
   }
   extensions->textureUsageANGLE = true;  // This could be false since it has no effect in D3D11
   extensions->discardFramebufferEXT               = true;
   extensions->translatedShaderSourceANGLE         = true;
   extensions->fboRenderMipmapOES                  = true;
   extensions->debugMarkerEXT                      = true;
   extensions->EGLImageOES                         = true;
   extensions->EGLImageExternalOES                 = true;
   extensions->EGLImageExternalWrapModesEXT        = true;
   extensions->EGLImageExternalEssl3OES            = true;
   extensions->EGLStreamConsumerExternalNV         = true;
   extensions->unpackSubimageEXT                   = true;
   extensions->packSubimageNV                      = true;
   extensions->lossyEtcDecodeANGLE                 = true;
   extensions->syncQueryCHROMIUM                   = GetEventQuerySupport(featureLevel);
   extensions->copyTextureCHROMIUM                 = true;
   extensions->copyCompressedTextureCHROMIUM       = true;
   extensions->textureStorageMultisample2dArrayOES = true;
   extensions->multiviewMultisampleANGLE =
       ((extensions->multiviewOVR || extensions->multiview2OVR) &&
        extensions->textureStorageMultisample2dArrayOES);
   extensions->copyTexture3dANGLE      = true;
   extensions->textureBorderClampOES   = true;
   extensions->multiDrawIndirectEXT    = true;
   extensions->textureMultisampleANGLE = true;
   extensions->provokingVertexANGLE    = true;
   extensions->blendFuncExtendedEXT    = true;
   // http://anglebug.com/4926
   extensions->texture3DOES                             = false;
   extensions->baseInstanceEXT                          = true;
   extensions->baseVertexBaseInstanceANGLE              = true;
   extensions->baseVertexBaseInstanceShaderBuiltinANGLE = true;
   extensions->drawElementsBaseVertexOES                = true;
   extensions->drawElementsBaseVertexEXT                = true;
   if (!strstr(description, "Adreno"))
   {
       extensions->multisampledRenderToTextureEXT = true;
   }
   extensions->videoTextureWEBGL = true;

   // D3D11 cannot support reading depth texture as a luminance texture.
   // It treats it as a red-channel-only texture.
   extensions->depthTextureOES = false;

   // readPixels on depth & stencil not working with D3D11 backend.
   extensions->readDepthNV         = false;
   extensions->readStencilNV       = false;
   extensions->depthBufferFloat2NV = false;

   // GL_EXT_clip_control
   extensions->clipControlEXT = (renderer11DeviceCaps.featureLevel >= D3D_FEATURE_LEVEL_9_3);

   // GL_KHR_parallel_shader_compile
   extensions->parallelShaderCompileKHR = true;

   // GL_EXT_texture_buffer
   extensions->textureBufferEXT = HasTextureBufferSupport(device, renderer11DeviceCaps);

   // GL_OES_texture_buffer
   extensions->textureBufferOES = extensions->textureBufferEXT;

   // ANGLE_shader_pixel_local_storage -- fragment shader UAVs appear in D3D 11.0.
   extensions->shaderPixelLocalStorageANGLE = (featureLevel >= D3D_FEATURE_LEVEL_11_0);
   extensions->shaderPixelLocalStorageCoherentANGLE =
       renderer11DeviceCaps.supportsRasterizerOrderViews;

   // D3D11 Feature Level 10_0+ uses SV_IsFrontFace in HLSL to emulate gl_FrontFacing.
   // D3D11 Feature Level 9_3 doesn't support SV_IsFrontFace, and has no equivalent, so can't
   // support gl_FrontFacing.
   limitations->noFrontFacingSupport =
       (renderer11DeviceCaps.featureLevel <= D3D_FEATURE_LEVEL_9_3);

   // D3D11 Feature Level 9_3 doesn't support alpha-to-coverage
   limitations->noSampleAlphaToCoverageSupport =
       (renderer11DeviceCaps.featureLevel <= D3D_FEATURE_LEVEL_9_3);

   // D3D11 Feature Levels 9_3 and below do not support non-constant loop indexing and require
   // additional
   // pre-validation of the shader at compile time to produce a better error message.
   limitations->shadersRequireIndexedLoopValidation =
       (renderer11DeviceCaps.featureLevel <= D3D_FEATURE_LEVEL_9_3);

   // D3D11 has no concept of separate masks and refs for front and back faces in the depth stencil
   // state.
   limitations->noSeparateStencilRefsAndMasks = true;

   // D3D11 cannot support constant color and alpha blend funcs together
   limitations->noSimultaneousConstantColorAndAlphaBlendFunc = true;

   // D3D11 does not support multiple transform feedback outputs writing to the same buffer.
   limitations->noDoubleBoundTransformFeedbackBuffers = true;

   // D3D11 does not support vertex attribute aliasing
   limitations->noVertexAttributeAliasing = true;

   // D3D11 does not support compressed textures where the base mip level is not a multiple of 4
   limitations->compressedBaseMipLevelMultipleOfFour = true;

   if (extensions->textureBufferAny())
   {
       caps->maxTextureBufferSize = 1 << D3D11_REQ_BUFFER_RESOURCE_TEXEL_COUNT_2_TO_EXP;
       // this maybe touble for RGB32 format.
       caps->textureBufferOffsetAlignment = 16;
   }

#ifdef ANGLE_ENABLE_WINDOWS_UWP
   // Setting a non-zero divisor on attribute zero doesn't work on certain Windows Phone 8-era
   // devices. We should prevent developers from doing this on ALL Windows Store devices. This will
   // maintain consistency across all Windows devices. We allow non-zero divisors on attribute zero
   // if the Client Version >= 3, since devices affected by this issue don't support ES3+.
   limitations->attributeZeroRequiresZeroDivisorInEXT = true;
#endif
}

}  // namespace d3d11_gl

namespace gl_d3d11
{

D3D11_BLEND ConvertBlendFunc(GLenum glBlend, bool isAlpha)
{
   D3D11_BLEND d3dBlend = D3D11_BLEND_ZERO;

   switch (glBlend)
   {
       case GL_ZERO:
           d3dBlend = D3D11_BLEND_ZERO;
           break;
       case GL_ONE:
           d3dBlend = D3D11_BLEND_ONE;
           break;
       case GL_SRC_COLOR:
           d3dBlend = (isAlpha ? D3D11_BLEND_SRC_ALPHA : D3D11_BLEND_SRC_COLOR);
           break;
       case GL_ONE_MINUS_SRC_COLOR:
           d3dBlend = (isAlpha ? D3D11_BLEND_INV_SRC_ALPHA : D3D11_BLEND_INV_SRC_COLOR);
           break;
       case GL_DST_COLOR:
           d3dBlend = (isAlpha ? D3D11_BLEND_DEST_ALPHA : D3D11_BLEND_DEST_COLOR);
           break;
       case GL_ONE_MINUS_DST_COLOR:
           d3dBlend = (isAlpha ? D3D11_BLEND_INV_DEST_ALPHA : D3D11_BLEND_INV_DEST_COLOR);
           break;
       case GL_SRC_ALPHA:
           d3dBlend = D3D11_BLEND_SRC_ALPHA;
           break;
       case GL_ONE_MINUS_SRC_ALPHA:
           d3dBlend = D3D11_BLEND_INV_SRC_ALPHA;
           break;
       case GL_DST_ALPHA:
           d3dBlend = D3D11_BLEND_DEST_ALPHA;
           break;
       case GL_ONE_MINUS_DST_ALPHA:
           d3dBlend = D3D11_BLEND_INV_DEST_ALPHA;
           break;
       case GL_CONSTANT_COLOR:
           d3dBlend = D3D11_BLEND_BLEND_FACTOR;
           break;
       case GL_ONE_MINUS_CONSTANT_COLOR:
           d3dBlend = D3D11_BLEND_INV_BLEND_FACTOR;
           break;
       case GL_CONSTANT_ALPHA:
           d3dBlend = D3D11_BLEND_BLEND_FACTOR;
           break;
       case GL_ONE_MINUS_CONSTANT_ALPHA:
           d3dBlend = D3D11_BLEND_INV_BLEND_FACTOR;
           break;
       case GL_SRC_ALPHA_SATURATE:
           d3dBlend = D3D11_BLEND_SRC_ALPHA_SAT;
           break;
       case GL_SRC1_COLOR_EXT:
           d3dBlend = (isAlpha ? D3D11_BLEND_SRC1_ALPHA : D3D11_BLEND_SRC1_COLOR);
           break;
       case GL_SRC1_ALPHA_EXT:
           d3dBlend = D3D11_BLEND_SRC1_ALPHA;
           break;
       case GL_ONE_MINUS_SRC1_COLOR_EXT:
           d3dBlend = (isAlpha ? D3D11_BLEND_INV_SRC1_ALPHA : D3D11_BLEND_INV_SRC1_COLOR);
           break;
       case GL_ONE_MINUS_SRC1_ALPHA_EXT:
           d3dBlend = D3D11_BLEND_INV_SRC1_ALPHA;
           break;
       default:
           UNREACHABLE();
   }

   return d3dBlend;
}

D3D11_BLEND_OP ConvertBlendOp(GLenum glBlendOp)
{
   D3D11_BLEND_OP d3dBlendOp = D3D11_BLEND_OP_ADD;

   switch (glBlendOp)
   {
       case GL_FUNC_ADD:
           d3dBlendOp = D3D11_BLEND_OP_ADD;
           break;
       case GL_FUNC_SUBTRACT:
           d3dBlendOp = D3D11_BLEND_OP_SUBTRACT;
           break;
       case GL_FUNC_REVERSE_SUBTRACT:
           d3dBlendOp = D3D11_BLEND_OP_REV_SUBTRACT;
           break;
       case GL_MIN:
           d3dBlendOp = D3D11_BLEND_OP_MIN;
           break;
       case GL_MAX:
           d3dBlendOp = D3D11_BLEND_OP_MAX;
           break;
       default:
           UNREACHABLE();
   }

   return d3dBlendOp;
}

UINT8 ConvertColorMask(bool red, bool green, bool blue, bool alpha)
{
   UINT8 mask = 0;
   if (red)
   {
       mask |= D3D11_COLOR_WRITE_ENABLE_RED;
   }
   if (green)
   {
       mask |= D3D11_COLOR_WRITE_ENABLE_GREEN;
   }
   if (blue)
   {
       mask |= D3D11_COLOR_WRITE_ENABLE_BLUE;
   }
   if (alpha)
   {
       mask |= D3D11_COLOR_WRITE_ENABLE_ALPHA;
   }
   return mask;
}

D3D11_CULL_MODE ConvertCullMode(bool cullEnabled, gl::CullFaceMode cullMode)
{
   D3D11_CULL_MODE cull = D3D11_CULL_NONE;

   if (cullEnabled)
   {
       switch (cullMode)
       {
           case gl::CullFaceMode::Front:
               cull = D3D11_CULL_FRONT;
               break;
           case gl::CullFaceMode::Back:
               cull = D3D11_CULL_BACK;
               break;
           case gl::CullFaceMode::FrontAndBack:
               cull = D3D11_CULL_NONE;
               break;
           default:
               UNREACHABLE();
       }
   }
   else
   {
       cull = D3D11_CULL_NONE;
   }

   return cull;
}

D3D11_COMPARISON_FUNC ConvertComparison(GLenum comparison)
{
   D3D11_COMPARISON_FUNC d3dComp = D3D11_COMPARISON_NEVER;
   switch (comparison)
   {
       case GL_NEVER:
           d3dComp = D3D11_COMPARISON_NEVER;
           break;
       case GL_ALWAYS:
           d3dComp = D3D11_COMPARISON_ALWAYS;
           break;
       case GL_LESS:
           d3dComp = D3D11_COMPARISON_LESS;
           break;
       case GL_LEQUAL:
           d3dComp = D3D11_COMPARISON_LESS_EQUAL;
           break;
       case GL_EQUAL:
           d3dComp = D3D11_COMPARISON_EQUAL;
           break;
       case GL_GREATER:
           d3dComp = D3D11_COMPARISON_GREATER;
           break;
       case GL_GEQUAL:
           d3dComp = D3D11_COMPARISON_GREATER_EQUAL;
           break;
       case GL_NOTEQUAL:
           d3dComp = D3D11_COMPARISON_NOT_EQUAL;
           break;
       default:
           UNREACHABLE();
   }

   return d3dComp;
}

D3D11_DEPTH_WRITE_MASK ConvertDepthMask(bool depthWriteEnabled)
{
   return depthWriteEnabled ? D3D11_DEPTH_WRITE_MASK_ALL : D3D11_DEPTH_WRITE_MASK_ZERO;
}

UINT8 ConvertStencilMask(GLuint stencilmask)
{
   return static_cast<UINT8>(stencilmask);
}

D3D11_STENCIL_OP ConvertStencilOp(GLenum stencilOp)
{
   D3D11_STENCIL_OP d3dStencilOp = D3D11_STENCIL_OP_KEEP;

   switch (stencilOp)
   {
       case GL_ZERO:
           d3dStencilOp = D3D11_STENCIL_OP_ZERO;
           break;
       case GL_KEEP:
           d3dStencilOp = D3D11_STENCIL_OP_KEEP;
           break;
       case GL_REPLACE:
           d3dStencilOp = D3D11_STENCIL_OP_REPLACE;
           break;
       case GL_INCR:
           d3dStencilOp = D3D11_STENCIL_OP_INCR_SAT;
           break;
       case GL_DECR:
           d3dStencilOp = D3D11_STENCIL_OP_DECR_SAT;
           break;
       case GL_INVERT:
           d3dStencilOp = D3D11_STENCIL_OP_INVERT;
           break;
       case GL_INCR_WRAP:
           d3dStencilOp = D3D11_STENCIL_OP_INCR;
           break;
       case GL_DECR_WRAP:
           d3dStencilOp = D3D11_STENCIL_OP_DECR;
           break;
       default:
           UNREACHABLE();
   }

   return d3dStencilOp;
}

D3D11_FILTER ConvertFilter(GLenum minFilter,
                          GLenum magFilter,
                          float maxAnisotropy,
                          GLenum comparisonMode)
{
   bool comparison = comparisonMode != GL_NONE;

   if (maxAnisotropy > 1.0f)
   {
       return D3D11_ENCODE_ANISOTROPIC_FILTER(static_cast<D3D11_COMPARISON_FUNC>(comparison));
   }
   else
   {
       D3D11_FILTER_TYPE dxMin = D3D11_FILTER_TYPE_POINT;
       D3D11_FILTER_TYPE dxMip = D3D11_FILTER_TYPE_POINT;
       switch (minFilter)
       {
           case GL_NEAREST:
               dxMin = D3D11_FILTER_TYPE_POINT;
               dxMip = D3D11_FILTER_TYPE_POINT;
               break;
           case GL_LINEAR:
               dxMin = D3D11_FILTER_TYPE_LINEAR;
               dxMip = D3D11_FILTER_TYPE_POINT;
               break;
           case GL_NEAREST_MIPMAP_NEAREST:
               dxMin = D3D11_FILTER_TYPE_POINT;
               dxMip = D3D11_FILTER_TYPE_POINT;
               break;
           case GL_LINEAR_MIPMAP_NEAREST:
               dxMin = D3D11_FILTER_TYPE_LINEAR;
               dxMip = D3D11_FILTER_TYPE_POINT;
               break;
           case GL_NEAREST_MIPMAP_LINEAR:
               dxMin = D3D11_FILTER_TYPE_POINT;
               dxMip = D3D11_FILTER_TYPE_LINEAR;
               break;
           case GL_LINEAR_MIPMAP_LINEAR:
               dxMin = D3D11_FILTER_TYPE_LINEAR;
               dxMip = D3D11_FILTER_TYPE_LINEAR;
               break;
           default:
               UNREACHABLE();
       }

       D3D11_FILTER_TYPE dxMag = D3D11_FILTER_TYPE_POINT;
       switch (magFilter)
       {
           case GL_NEAREST:
               dxMag = D3D11_FILTER_TYPE_POINT;
               break;
           case GL_LINEAR:
               dxMag = D3D11_FILTER_TYPE_LINEAR;
               break;
           default:
               UNREACHABLE();
       }

       return D3D11_ENCODE_BASIC_FILTER(dxMin, dxMag, dxMip,
                                        static_cast<D3D11_COMPARISON_FUNC>(comparison));
   }
}

D3D11_TEXTURE_ADDRESS_MODE ConvertTextureWrap(GLenum wrap)
{
   switch (wrap)
   {
       case GL_REPEAT:
           return D3D11_TEXTURE_ADDRESS_WRAP;
       case GL_CLAMP_TO_EDGE:
           return D3D11_TEXTURE_ADDRESS_CLAMP;
       case GL_CLAMP_TO_BORDER:
           return D3D11_TEXTURE_ADDRESS_BORDER;
       case GL_MIRRORED_REPEAT:
           return D3D11_TEXTURE_ADDRESS_MIRROR;
       default:
           UNREACHABLE();
   }

   return D3D11_TEXTURE_ADDRESS_WRAP;
}

UINT ConvertMaxAnisotropy(float maxAnisotropy, D3D_FEATURE_LEVEL featureLevel)
{
   return static_cast<UINT>(std::min(maxAnisotropy, d3d11_gl::GetMaximumAnisotropy(featureLevel)));
}

D3D11_QUERY ConvertQueryType(gl::QueryType type)
{
   switch (type)
   {
       case gl::QueryType::AnySamples:
       case gl::QueryType::AnySamplesConservative:
           return D3D11_QUERY_OCCLUSION;
       case gl::QueryType::TransformFeedbackPrimitivesWritten:
           return D3D11_QUERY_SO_STATISTICS;
       case gl::QueryType::TimeElapsed:
           // Two internal queries are also created for begin/end timestamps
           return D3D11_QUERY_TIMESTAMP_DISJOINT;
       case gl::QueryType::CommandsCompleted:
           return D3D11_QUERY_EVENT;
       default:
           UNREACHABLE();
           return D3D11_QUERY_EVENT;
   }
}

// Get the D3D11 write mask covering all color channels of a given format
UINT8 GetColorMask(const gl::InternalFormat &format)
{
   return ConvertColorMask(format.redBits > 0, format.greenBits > 0, format.blueBits > 0,
                           format.alphaBits > 0);
}

}  // namespace gl_d3d11

namespace d3d11
{

ANGLED3D11DeviceType GetDeviceType(ID3D11Device *device)
{
   // Note that this function returns an ANGLED3D11DeviceType rather than a D3D_DRIVER_TYPE value,
   // since it is difficult to tell Software and Reference devices apart

   IDXGIDevice *dxgiDevice     = nullptr;
   IDXGIAdapter *dxgiAdapter   = nullptr;
   IDXGIAdapter2 *dxgiAdapter2 = nullptr;

   ANGLED3D11DeviceType retDeviceType = ANGLE_D3D11_DEVICE_TYPE_UNKNOWN;

   HRESULT hr = device->QueryInterface(__uuidof(IDXGIDevice), (void **)&dxgiDevice);
   if (SUCCEEDED(hr))
   {
       hr = dxgiDevice->GetParent(__uuidof(IDXGIAdapter), (void **)&dxgiAdapter);
       if (SUCCEEDED(hr))
       {
           std::wstring adapterString;
           HRESULT adapter2hr =
               dxgiAdapter->QueryInterface(__uuidof(dxgiAdapter2), (void **)&dxgiAdapter2);
           if (SUCCEEDED(adapter2hr))
           {
               // On D3D_FEATURE_LEVEL_9_*, IDXGIAdapter::GetDesc returns "Software Adapter"
               // for the description string. Try to use IDXGIAdapter2::GetDesc2 to get the
               // actual hardware values if possible.
               DXGI_ADAPTER_DESC2 adapterDesc2;
               dxgiAdapter2->GetDesc2(&adapterDesc2);
               adapterString = std::wstring(adapterDesc2.Description);
           }
           else
           {
               DXGI_ADAPTER_DESC adapterDesc;
               dxgiAdapter->GetDesc(&adapterDesc);
               adapterString = std::wstring(adapterDesc.Description);
           }

           // Both Reference and Software adapters will be 'Software Adapter'
           const bool isSoftwareDevice =
               (adapterString.find(std::wstring(L"Software Adapter")) != std::string::npos);
           const bool isNullDevice = (adapterString == L"");
           const bool isWARPDevice =
               (adapterString.find(std::wstring(L"Basic Render")) != std::string::npos);

           if (isSoftwareDevice || isNullDevice)
           {
               ASSERT(!isWARPDevice);
               retDeviceType = ANGLE_D3D11_DEVICE_TYPE_SOFTWARE_REF_OR_NULL;
           }
           else if (isWARPDevice)
           {
               retDeviceType = ANGLE_D3D11_DEVICE_TYPE_WARP;
           }
           else
           {
               retDeviceType = ANGLE_D3D11_DEVICE_TYPE_HARDWARE;
           }
       }
   }

   SafeRelease(dxgiDevice);
   SafeRelease(dxgiAdapter);
   SafeRelease(dxgiAdapter2);

   return retDeviceType;
}

void MakeValidSize(bool isImage,
                  DXGI_FORMAT format,
                  GLsizei *requestWidth,
                  GLsizei *requestHeight,
                  int *levelOffset)
{
   const DXGIFormatSize &dxgiFormatInfo = d3d11::GetDXGIFormatSizeInfo(format);
   bool validFormat                     = format != DXGI_FORMAT_UNKNOWN;
   bool validImage                      = isImage && validFormat;

   int upsampleCount = 0;
   // Don't expand the size of full textures that are at least (blockWidth x blockHeight) already.
   if (validImage || *requestWidth < static_cast<GLsizei>(dxgiFormatInfo.blockWidth) ||
       *requestHeight < static_cast<GLsizei>(dxgiFormatInfo.blockHeight))
   {
       while (*requestWidth % dxgiFormatInfo.blockWidth != 0 ||
              *requestHeight % dxgiFormatInfo.blockHeight != 0)
       {
           *requestWidth <<= 1;
           *requestHeight <<= 1;
           upsampleCount++;
       }
   }
   else if (validFormat)
   {
       if (*requestWidth % dxgiFormatInfo.blockWidth != 0)
       {
           *requestWidth = roundUp(*requestWidth, static_cast<GLsizei>(dxgiFormatInfo.blockWidth));
       }

       if (*requestHeight % dxgiFormatInfo.blockHeight != 0)
       {
           *requestHeight =
               roundUp(*requestHeight, static_cast<GLsizei>(dxgiFormatInfo.blockHeight));
       }
   }

   if (levelOffset)
   {
       *levelOffset = upsampleCount;
   }
}

angle::Result GenerateInitialTextureData(
   const gl::Context *context,
   GLint internalFormat,
   const Renderer11DeviceCaps &renderer11DeviceCaps,
   GLuint width,
   GLuint height,
   GLuint depth,
   GLuint mipLevels,
   gl::TexLevelArray<D3D11_SUBRESOURCE_DATA> *outSubresourceData)
{
   const d3d11::Format &d3dFormatInfo = d3d11::Format::Get(internalFormat, renderer11DeviceCaps);
   ASSERT(d3dFormatInfo.dataInitializerFunction != nullptr);

   const d3d11::DXGIFormatSize &dxgiFormatInfo =
       d3d11::GetDXGIFormatSizeInfo(d3dFormatInfo.texFormat);

   using CheckedSize        = angle::CheckedNumeric<size_t>;
   CheckedSize rowPitch     = CheckedSize(dxgiFormatInfo.pixelBytes) * CheckedSize(width);
   CheckedSize depthPitch   = rowPitch * CheckedSize(height);
   CheckedSize maxImageSize = depthPitch * CheckedSize(depth);

   Context11 *context11 = GetImplAs<Context11>(context);
   ANGLE_CHECK_GL_ALLOC(context11, maxImageSize.IsValid());

   angle::MemoryBuffer *scratchBuffer = nullptr;
   ANGLE_CHECK_GL_ALLOC(context11,
                        context->getScratchBuffer(maxImageSize.ValueOrDie(), &scratchBuffer));

   d3dFormatInfo.dataInitializerFunction(width, height, depth, scratchBuffer->data(),
                                         rowPitch.ValueOrDie(), depthPitch.ValueOrDie());

   for (unsigned int i = 0; i < mipLevels; i++)
   {
       unsigned int mipWidth  = std::max(width >> i, 1U);
       unsigned int mipHeight = std::max(height >> i, 1U);

       using CheckedUINT         = angle::CheckedNumeric<UINT>;
       CheckedUINT mipRowPitch   = CheckedUINT(dxgiFormatInfo.pixelBytes) * CheckedUINT(mipWidth);
       CheckedUINT mipDepthPitch = mipRowPitch * CheckedUINT(mipHeight);

       ANGLE_CHECK_GL_ALLOC(context11, mipRowPitch.IsValid() && mipDepthPitch.IsValid());

       outSubresourceData->at(i).pSysMem          = scratchBuffer->data();
       outSubresourceData->at(i).SysMemPitch      = mipRowPitch.ValueOrDie();
       outSubresourceData->at(i).SysMemSlicePitch = mipDepthPitch.ValueOrDie();
   }

   return angle::Result::Continue;
}

UINT GetPrimitiveRestartIndex()
{
   return std::numeric_limits<UINT>::max();
}

void SetPositionTexCoordVertex(PositionTexCoordVertex *vertex, float x, float y, float u, float v)
{
   vertex->x = x;
   vertex->y = y;
   vertex->u = u;
   vertex->v = v;
}

void SetPositionLayerTexCoord3DVertex(PositionLayerTexCoord3DVertex *vertex,
                                     float x,
                                     float y,
                                     unsigned int layer,
                                     float u,
                                     float v,
                                     float s)
{
   vertex->x = x;
   vertex->y = y;
   vertex->l = layer;
   vertex->u = u;
   vertex->v = v;
   vertex->s = s;
}

BlendStateKey::BlendStateKey()
{
   memset(this, 0, sizeof(BlendStateKey));
   blendStateExt = gl::BlendStateExt();
}

BlendStateKey::BlendStateKey(const BlendStateKey &other)
{
   memcpy(this, &other, sizeof(BlendStateKey));
}

bool operator==(const BlendStateKey &a, const BlendStateKey &b)
{
   return memcmp(&a, &b, sizeof(BlendStateKey)) == 0;
}

bool operator!=(const BlendStateKey &a, const BlendStateKey &b)
{
   return !(a == b);
}

RasterizerStateKey::RasterizerStateKey()
{
   memset(this, 0, sizeof(RasterizerStateKey));
}

bool operator==(const RasterizerStateKey &a, const RasterizerStateKey &b)
{
   return memcmp(&a, &b, sizeof(RasterizerStateKey)) == 0;
}

bool operator!=(const RasterizerStateKey &a, const RasterizerStateKey &b)
{
   return !(a == b);
}

HRESULT SetDebugName(ID3D11DeviceChild *resource,
                    const char *internalName,
                    const std::string *khrDebugName)
{
   // Prepend ANGLE to separate names from other components in the same process.
   std::string d3dName = "ANGLE";
   bool sendNameToD3D  = false;
   if (internalName && internalName[0] != '\0')
   {
       d3dName += std::string("_") + internalName;
       sendNameToD3D = true;
   }
   if (khrDebugName && !khrDebugName->empty())
   {
       d3dName += std::string("_") + *khrDebugName;
       sendNameToD3D = true;
   }
   // If both internalName and khrDebugName are empty, avoid sending the string to d3d.
   if (sendNameToD3D)
   {
       return resource->SetPrivateData(WKPDID_D3DDebugObjectName,
                                       static_cast<UINT>(d3dName.size()), d3dName.c_str());
   }
   return S_OK;
}

// Keep this in cpp file where it has visibility of Renderer11.h, otherwise calling
// allocateResource is only compatible with Clang and MSVS, which support calling a
// method on a forward declared class in a template.
template <ResourceType ResourceT>
angle::Result LazyResource<ResourceT>::resolveImpl(d3d::Context *context,
                                                  Renderer11 *renderer,
                                                  const GetDescType<ResourceT> &desc,
                                                  GetInitDataType<ResourceT> *initData,
                                                  const char *name)
{
   if (!mResource.valid())
   {
       ANGLE_TRY(renderer->allocateResource(context, desc, initData, &mResource));
       mResource.setInternalName(name);
   }
   return angle::Result::Continue;
}

template angle::Result LazyResource<ResourceType::BlendState>::resolveImpl(
   d3d::Context *context,
   Renderer11 *renderer,
   const D3D11_BLEND_DESC &desc,
   void *initData,
   const char *name);
template angle::Result LazyResource<ResourceType::ComputeShader>::resolveImpl(
   d3d::Context *context,
   Renderer11 *renderer,
   const ShaderData &desc,
   void *initData,
   const char *name);
template angle::Result LazyResource<ResourceType::GeometryShader>::resolveImpl(
   d3d::Context *context,
   Renderer11 *renderer,
   const ShaderData &desc,
   const std::vector<D3D11_SO_DECLARATION_ENTRY> *initData,
   const char *name);
template angle::Result LazyResource<ResourceType::InputLayout>::resolveImpl(
   d3d::Context *context,
   Renderer11 *renderer,
   const InputElementArray &desc,
   const ShaderData *initData,
   const char *name);
template angle::Result LazyResource<ResourceType::PixelShader>::resolveImpl(d3d::Context *context,
                                                                           Renderer11 *renderer,
                                                                           const ShaderData &desc,
                                                                           void *initData,
                                                                           const char *name);
template angle::Result LazyResource<ResourceType::VertexShader>::resolveImpl(d3d::Context *context,
                                                                            Renderer11 *renderer,
                                                                            const ShaderData &desc,
                                                                            void *initData,
                                                                            const char *name);

LazyInputLayout::LazyInputLayout(const D3D11_INPUT_ELEMENT_DESC *inputDesc,
                                size_t inputDescLen,
                                const BYTE *byteCode,
                                size_t byteCodeLen,
                                const char *debugName)
   : mInputDesc(inputDesc, inputDescLen), mByteCode(byteCode, byteCodeLen), mDebugName(debugName)
{}

LazyInputLayout::~LazyInputLayout() {}

angle::Result LazyInputLayout::resolve(d3d::Context *context, Renderer11 *renderer)
{
   return resolveImpl(context, renderer, mInputDesc, &mByteCode, mDebugName);
}

LazyBlendState::LazyBlendState(const D3D11_BLEND_DESC &desc, const char *debugName)
   : mDesc(desc), mDebugName(debugName)
{}

angle::Result LazyBlendState::resolve(d3d::Context *context, Renderer11 *renderer)
{
   return resolveImpl(context, renderer, mDesc, nullptr, mDebugName);
}

void InitializeFeatures(const Renderer11DeviceCaps &deviceCaps,
                       const DXGI_ADAPTER_DESC &adapterDesc,
                       angle::FeaturesD3D *features)
{
   bool isNvidia          = IsNvidia(adapterDesc.VendorId);
   bool isIntel           = IsIntel(adapterDesc.VendorId);
   bool isSkylake         = false;
   bool isBroadwell       = false;
   bool isHaswell         = false;
   bool isIvyBridge       = false;
   bool isSandyBridge     = false;
   bool isAMD             = IsAMD(adapterDesc.VendorId);
   bool isFeatureLevel9_3 = (deviceCaps.featureLevel <= D3D_FEATURE_LEVEL_9_3);

   IntelDriverVersion capsVersion = IntelDriverVersion(0);
   if (isIntel)
   {
       capsVersion = d3d11_gl::GetIntelDriverVersion(deviceCaps.driverVersion);

       isSkylake     = IsSkylake(adapterDesc.DeviceId);
       isBroadwell   = IsBroadwell(adapterDesc.DeviceId);
       isHaswell     = IsHaswell(adapterDesc.DeviceId);
       isIvyBridge   = IsIvyBridge(adapterDesc.DeviceId);
       isSandyBridge = IsSandyBridge(adapterDesc.DeviceId);
   }

   if (isNvidia)
   {
       // TODO(jmadill): Narrow problematic driver range.
       bool driverVersionValid = deviceCaps.driverVersion.valid();
       if (driverVersionValid)
       {
           WORD part1 = HIWORD(deviceCaps.driverVersion.value().LowPart);
           WORD part2 = LOWORD(deviceCaps.driverVersion.value().LowPart);

           // Disable the workaround to fix a second driver bug on newer NVIDIA.
           ANGLE_FEATURE_CONDITION(
               features, depthStencilBlitExtraCopy,
               (part1 <= 13u && part2 < 6881) && isNvidia && driverVersionValid);
       }
       else
       {
           ANGLE_FEATURE_CONDITION(features, depthStencilBlitExtraCopy,
                                   isNvidia && !driverVersionValid);
       }
   }

   ANGLE_FEATURE_CONDITION(features, mrtPerfWorkaround, true);
   ANGLE_FEATURE_CONDITION(features, zeroMaxLodWorkaround, isFeatureLevel9_3);
   ANGLE_FEATURE_CONDITION(features, useInstancedPointSpriteEmulation, isFeatureLevel9_3);
   ANGLE_FEATURE_CONDITION(features, allowES3OnFL100, false);

   // TODO(jmadill): Disable workaround when we have a fixed compiler DLL.
   ANGLE_FEATURE_CONDITION(features, expandIntegerPowExpressions, true);

   ANGLE_FEATURE_CONDITION(features, flushAfterEndingTransformFeedback, isNvidia);
   ANGLE_FEATURE_CONDITION(features, getDimensionsIgnoresBaseLevel, isNvidia);
   ANGLE_FEATURE_CONDITION(features, skipVSConstantRegisterZero, isNvidia);
   ANGLE_FEATURE_CONDITION(features, forceAtomicValueResolution, isNvidia);

   ANGLE_FEATURE_CONDITION(features, preAddTexelFetchOffsets, isIntel);
   ANGLE_FEATURE_CONDITION(features, useSystemMemoryForConstantBuffers, isIntel);

   // ClearView on Skylake seems to incorrectly clear with unaligned rects (edge has saw tooth
   // pattern instead of straight).
   ANGLE_FEATURE_CONDITION(features, scissoredClearArtifacts, isIntel && isSkylake);

   ANGLE_FEATURE_CONDITION(features, callClearTwice,
                           isIntel && isSkylake && capsVersion >= IntelDriverVersion(160000) &&
                               capsVersion < IntelDriverVersion(164771));
   ANGLE_FEATURE_CONDITION(features, emulateIsnanFloat,
                           isIntel && isSkylake && capsVersion >= IntelDriverVersion(160000) &&
                               capsVersion < IntelDriverVersion(164542));
   ANGLE_FEATURE_CONDITION(features, rewriteUnaryMinusOperator,
                           isIntel && (isBroadwell || isHaswell) &&
                               capsVersion >= IntelDriverVersion(150000) &&
                               capsVersion < IntelDriverVersion(154624));

   ANGLE_FEATURE_CONDITION(features, addMockTextureNoRenderTarget,
                           isIntel && capsVersion >= IntelDriverVersion(160000) &&
                               capsVersion < IntelDriverVersion(164815));

   // Haswell drivers occasionally corrupt (small?) (vertex?) texture data uploads for 128bit
   // formats.
   ANGLE_FEATURE_CONDITION(features, setDataFasterThanImageUpload, true);
   ANGLE_FEATURE_CONDITION(features, setDataFasterThanImageUploadOn128bitFormats,
                           !(isIvyBridge || isBroadwell || isHaswell));

   ANGLE_FEATURE_CONDITION(features, emulateClearViewAfterDualSourceBlending, isSandyBridge);

   ANGLE_FEATURE_CONDITION(features, disableB5G6R5Support,
                           (isIntel && capsVersion >= IntelDriverVersion(150000) &&
                            capsVersion < IntelDriverVersion(154539)) ||
                               isAMD);

   // TODO(jmadill): Disable when we have a fixed driver version.
   // The tiny stencil texture workaround involves using CopySubresource or UpdateSubresource on a
   // depth stencil texture.  This is not allowed until feature level 10.1 but since it is not
   // possible to support ES3 on these devices, there is no need for the workaround to begin with
   // (anglebug.com/1572).
   ANGLE_FEATURE_CONDITION(features, emulateTinyStencilTextures,
                           isAMD && !(deviceCaps.featureLevel < D3D_FEATURE_LEVEL_10_1));

   // If the VPAndRTArrayIndexFromAnyShaderFeedingRasterizer feature is not available, we have to
   // select the viewport / RT array index in the geometry shader.
   ANGLE_FEATURE_CONDITION(features, selectViewInGeometryShader,
                           !deviceCaps.supportsVpRtIndexWriteFromVertexShader);

   // NVidia drivers have no trouble clearing textures without showing corruption.
   // Intel and AMD drivers that have trouble have been blocklisted by Chromium. In the case of
   // Intel, they've been blocklisted to the DX9 runtime.
   ANGLE_FEATURE_CONDITION(features, allowClearForRobustResourceInit, true);

   // Allow translating uniform block to StructuredBuffer on Windows 10. This is targeted
   // to work around a slow fxc compile performance issue with dynamic uniform indexing.
   ANGLE_FEATURE_CONDITION(features, allowTranslateUniformBlockToStructuredBuffer,
                           IsWin10OrGreater());
}

void InitializeFrontendFeatures(const DXGI_ADAPTER_DESC &adapterDesc,
                               angle::FrontendFeatures *features)
{
   bool isAMD = IsAMD(adapterDesc.VendorId);

   ANGLE_FEATURE_CONDITION(features, forceDepthAttachmentInitOnClear, isAMD);
}

void InitConstantBufferDesc(D3D11_BUFFER_DESC *constantBufferDescription, size_t byteWidth)
{
   constantBufferDescription->ByteWidth           = static_cast<UINT>(byteWidth);
   constantBufferDescription->Usage               = D3D11_USAGE_DYNAMIC;
   constantBufferDescription->BindFlags           = D3D11_BIND_CONSTANT_BUFFER;
   constantBufferDescription->CPUAccessFlags      = D3D11_CPU_ACCESS_WRITE;
   constantBufferDescription->MiscFlags           = 0;
   constantBufferDescription->StructureByteStride = 0;
}

}  // namespace d3d11

// TextureHelper11 implementation.
TextureHelper11::TextureHelper11() : mFormatSet(nullptr), mSampleCount(0) {}

TextureHelper11::TextureHelper11(TextureHelper11 &&toCopy) : TextureHelper11()
{
   *this = std::move(toCopy);
}

TextureHelper11::TextureHelper11(const TextureHelper11 &other)
   : mFormatSet(other.mFormatSet), mExtents(other.mExtents), mSampleCount(other.mSampleCount)
{
   mData = other.mData;
}

TextureHelper11::~TextureHelper11() {}

void TextureHelper11::getDesc(D3D11_TEXTURE2D_DESC *desc) const
{
   static_cast<ID3D11Texture2D *>(mData->object)->GetDesc(desc);
}

void TextureHelper11::getDesc(D3D11_TEXTURE3D_DESC *desc) const
{
   static_cast<ID3D11Texture3D *>(mData->object)->GetDesc(desc);
}

void TextureHelper11::getDesc(D3D11_BUFFER_DESC *desc) const
{
   static_cast<ID3D11Buffer *>(mData->object)->GetDesc(desc);
}

void TextureHelper11::initDesc(const D3D11_TEXTURE2D_DESC &desc2D)
{
   mData->resourceType = ResourceType::Texture2D;
   mExtents.width      = static_cast<int>(desc2D.Width);
   mExtents.height     = static_cast<int>(desc2D.Height);
   mExtents.depth      = 1;
   mSampleCount        = desc2D.SampleDesc.Count;
}

void TextureHelper11::initDesc(const D3D11_TEXTURE3D_DESC &desc3D)
{
   mData->resourceType = ResourceType::Texture3D;
   mExtents.width      = static_cast<int>(desc3D.Width);
   mExtents.height     = static_cast<int>(desc3D.Height);
   mExtents.depth      = static_cast<int>(desc3D.Depth);
   mSampleCount        = 1;
}

void TextureHelper11::initDesc(const D3D11_BUFFER_DESC &descBuffer)
{
   mData->resourceType = ResourceType::Buffer;
   mExtents.width      = static_cast<int>(descBuffer.ByteWidth);
   mExtents.height     = 1;
   mExtents.depth      = 1;
   mSampleCount        = 1;
}

TextureHelper11 &TextureHelper11::operator=(TextureHelper11 &&other)
{
   std::swap(mData, other.mData);
   std::swap(mExtents, other.mExtents);
   std::swap(mFormatSet, other.mFormatSet);
   std::swap(mSampleCount, other.mSampleCount);
   return *this;
}

TextureHelper11 &TextureHelper11::operator=(const TextureHelper11 &other)
{
   mData        = other.mData;
   mExtents     = other.mExtents;
   mFormatSet   = other.mFormatSet;
   mSampleCount = other.mSampleCount;
   return *this;
}

bool TextureHelper11::operator==(const TextureHelper11 &other) const
{
   return mData->object == other.mData->object;
}

bool TextureHelper11::operator!=(const TextureHelper11 &other) const
{
   return mData->object != other.mData->object;
}

bool UsePresentPathFast(const Renderer11 *renderer,
                       const gl::FramebufferAttachment *framebufferAttachment)
{
   if (framebufferAttachment == nullptr)
   {
       return false;
   }

   return (framebufferAttachment->type() == GL_FRAMEBUFFER_DEFAULT &&
           renderer->presentPathFastEnabled());
}

bool UsePrimitiveRestartWorkaround(bool primitiveRestartFixedIndexEnabled,
                                  gl::DrawElementsType type)
{
   // We should never have to deal with primitive restart workaround issue with GL_UNSIGNED_INT
   // indices, since we restrict it via MAX_ELEMENT_INDEX.
   return (!primitiveRestartFixedIndexEnabled && type == gl::DrawElementsType::UnsignedShort);
}

IndexStorageType ClassifyIndexStorage(const gl::State &glState,
                                     const gl::Buffer *elementArrayBuffer,
                                     gl::DrawElementsType elementType,
                                     gl::DrawElementsType destElementType,
                                     unsigned int offset)
{
   // No buffer bound means we are streaming from a client pointer.
   if (!elementArrayBuffer || !IsOffsetAligned(elementType, offset))
   {
       return IndexStorageType::Dynamic;
   }

   // The buffer can be used directly if the storage supports it and no translation needed.
   BufferD3D *bufferD3D = GetImplAs<BufferD3D>(elementArrayBuffer);
   if (bufferD3D->supportsDirectBinding() && destElementType == elementType)
   {
       return IndexStorageType::Direct;
   }

   // Use a static copy when available.
   StaticIndexBufferInterface *staticBuffer = bufferD3D->getStaticIndexBuffer();
   if (staticBuffer != nullptr)
   {
       return IndexStorageType::Static;
   }

   // Static buffer not available, fall back to streaming.
   return IndexStorageType::Dynamic;
}

bool SwizzleRequired(const gl::TextureState &textureState)
{
   // When sampling stencil, a swizzle is needed to move the stencil channel from G to R.
   return textureState.swizzleRequired() || textureState.isStencilMode();
}

gl::SwizzleState GetEffectiveSwizzle(const gl::TextureState &textureState)
{
   const gl::SwizzleState &swizzle = textureState.getSwizzleState();
   if (textureState.isStencilMode())
   {
       // Per GL semantics, the stencil value should be in the red channel, while D3D11 formats
       // leave stencil in the green channel. So copy the stencil value from green to all
       // components requesting red. Green and blue become zero; alpha becomes one.
       std::unordered_map<GLenum, GLenum> map = {{GL_RED, GL_GREEN}, {GL_GREEN, GL_ZERO},
                                                 {GL_BLUE, GL_ZERO}, {GL_ALPHA, GL_ONE},
                                                 {GL_ZERO, GL_ZERO}, {GL_ONE, GL_ONE}};

       return gl::SwizzleState(map[swizzle.swizzleRed], map[swizzle.swizzleGreen],
                               map[swizzle.swizzleBlue], map[swizzle.swizzleAlpha]);
   }
   return swizzle;
}

}  // namespace rx