18 lines
1.4 KiB
Markdown
18 lines
1.4 KiB
Markdown
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## HLSL Shaders
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This directory contains a fork of the shaders found in [data/shaders](https://github.com/SaschaWillems/Vulkan/tree/master/data/shaders), re-written in HLSL.
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These can be compiled with [DXC](https://github.com/microsoft/DirectXShaderCompiler) using the `compile.py` script.
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### Known issues
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- specialization constants can't be used to specify array size.
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- `gl_PointCoord` not supported. HLSL has no equivalent. We changed the shaders to calulate the PointCoord manually in the shader. (`computenbody`, `computeparticles`, `particlefire` examples).
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- HLSL doesn't have inverse operation (`deferred`, `hdr`, `instancing`, `skeletalanimation` & `texturecubemap` examples).
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- `modf` causes compilation to fail without errors or warnings. (`modf` not used by any examples, easily confused with fmod)
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- In `specializationconstants` example, shader compilation fails with error:
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```
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--- Error msg: fatal error: failed to optimize SPIR-V: Id 10 is defined more than once
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```
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When multiple constant ids are defined and have different types. We work around this problem by making all constant ids the same type, then use `asfloat`, `asint` or `asuint` to get the original value in the shader.
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- `gl_RayTmaxNV` not supported. (`nv_ray_tracing_*` examples)
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- HLSL interface for sparse residency textures is different from GLSL interface. After translating from HLSL to GLSL the shaders behave slightly different. Most important parts do behave identically though.
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