Feature support

Feature support

DXVK supports D3D11 up to Feature Level 12_0.

Optional feature support

DXVK supports the following optional features, provided that the Vulkan driver and GPU support the corresponding features:

• Tiled Resources: Up to Tier 3.
  • Multisampled tiled resources are not supported on all Vulkan drivers.
  • Sharing tiled resources or tile pools between multiple D3D devices is not supported.
  • Shader feedback on raw or structured buffer loads may be inaccurate if a single load straddles 64k pages.
• Conservative Rasterization: Up to Tier 3.
  • The corresponding Vulkan functionality is provided by VK_EXT_conservative_rasterization.
  • Some Vulkan drivers do not support SV_InnerCoverage and will be limited to Tier 2.
• Exporting Viewport Index and Render Target Array Index from vertex shaders or domain shaders.
  • This is expressed by the VPAndRTArrayIndexFromAnyShaderFeedingRasterizer feature in D3D11.
  • The corresponding Vulkan features are shaderOutputViewportIndex and shaderOutputLayer.
• Exporting the Stencil Reference from pixel shaders.
  • This is expressed by the PSSpecifiedStencilRefSupported feature in D3D11.
  • The corresponding Vulkan functionality is provided by VK_EXT_shader_stencil_export.
  • Not all hardware can support this.
• Double-precision shader instructions
  • This is expressed by the DoublePrecisionFloatShaderOps and ExtendedDoublesShaderInstructions features in D3D11.

Unsupported features:

The following core API features are unsupported:

• Class linkage. Compiling shaders that rely on this feature will fail.
• Predication. Calls to SetPredication are ignored.
  • Support for predicated draws and dispatches may be implemented in the future, other operations will remain unsupported.
  • Prefer using indirect draws or dispatches instead.
• Target-independent rasterization: In case a render target is bound, the ForcedSampleCount parameter of the current rasterizer state gets ignored.
  • ForcedSampleCount is supported when performing UAV rendering, i.e. rendering without any bound render targets.
  • Most Vulkan drivers do not support 16x MSAA.
• Video APIs. These are generally not supported.
  • There is rudimentary support for ID3D11VideoContext::VideoProcessorBlt, and related functionality required for setup.

The following optional features are unsupported:

• Rasterizer Ordered Views.
  • There is no corresponding Vulkan feature with good driver support.
• Minimum precision.
  • Shader instruction hits to use relaxed precision for certain instructions are ignored. Since DXBC does not natively support 16-bit types, this cannot be supported without a more elaborate compiler infrastructure.

The code that determines D3D11 feature support can be found here.

Shared resources

Shared Resources are partially supported, with the following restrictions:

• Proton patches are required.
• Not all formats that are guaranteed to be shareable by D3D11 are supported by all drivers.
• IDXGIKeyedMutex is unsupported due to extremely poor documentation.
• This does not and will never work at all on Windows.

If at all possible, please avoid sharing resources between different APIs, or different devices of the same API.