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o3de / o3de-azslc

Amazon Shader Language (AZSL) Compiler
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Add support for Specialization constants for shader options #88

Closed akioCL closed 4 months ago

akioCL commented 5 months ago

Add new command line argument ("--sc-options") was added to support shader options as specialization constants. Implementation was added for Vulkan, Metal and DX12. For Vulkan (and Metal) it translates shader options directly as specialization constants using a DXC attribute [[vk::constant_id]]. For DX12 it uses a volatile constant that will later be patched using another tool.

The [[no_specialization]] attribute was added to disable using specialization constants for a specific shader option.

Based on RFC https://github.com/o3de/sig-graphics-audio/issues/163

Other relevant PRs: https://github.com/o3de/DirectXShaderCompiler/pull/4 https://github.com/o3de/o3de/pull/18019

akioCL commented 4 months ago

Do you not need to edit the grammar to allow specialization constant tags?

No need for new attributes.