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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/target-compatibility.md | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/docs/target-compatibility.md b/docs/target-compatibility.md index e8edeeaf5..6967f7454 100644 --- a/docs/target-compatibility.md +++ b/docs/target-compatibility.md @@ -20,6 +20,7 @@ Items with ^ means there is some discussion about support later in the document | SM6.0 Wave Intrinsics | No | Yes | Partial | Yes | No | SM6.0 Quad Intrinsics | No | Yes | No + | No | No | SM6.5 Wave Intrinsics | No | Yes ^ | No + | Yes | No +| WaveShuffle | No | Limited ^ | Yes + | Yes | No | Tesselation | Yes ^ | Yes ^ | No + | No | No | Graphics Pipeline | Yes | Yes | Yes | No | No | Ray Tracing DXR 1.0 | No | Yes ^ | Yes ^ | No | No @@ -56,6 +57,16 @@ tex.GetDimensions is the GetDimensions method on 'texture' objects. This is not SM6.5 Wave Intrinsics are supported, but requires a downstream DXC compiler that supports SM6.5. As it stands the DXC shipping with windows does not. +## WaveShuffle + +WaveShuffle is an intrinsic added to the Slang stdlibrary to expose the glsl `subgroupShuffle` intrinsics and allow loosened requirements on laneId. + +`HLSL` uses `WaveReadLaneAt` and this requires the `laneId` must be 'dynamically uniform' across the wave. WaveShuffle has the same functionality but relaxes this restriction. + +`WaveReadLaneAt` most obviously maps to `subgroupBroadcast` in GLSL. This has the extra restriction the index must be compile time consts. With SPIR-V 1.5 it is allowed to be 'dynamically uniform', but doesn't work on current glslang. + +NOTE! That using WaveShuffle to target `HLSL` will produce `WaveReadLaneAt` - that means strictly speaking the restriction *still applies*, and the correct behavior will only be seen on hardware that allows the loosed requirements of laneId, on hardware that does not result of `WaveShuffle` is the same as `WaveReadLaneId` which is undefined. + ## Tesselation Although tesselation stages should work on D3D11 and D3D12 they are not tested within our test framework, and may have problems. |