335d3a1b75
Adds API to allow usage of specialization constants in shaders. Specialization constants are dynamic runtime constants which can be compiled into a shader pipeline state object (PSO) to improve runtime performance by reducing shader complexity through shader compiler constant-folding. This API allows specialization constant values to be specified along with a default value if no constant value has been declared. Each GPU backend is then responsible for caching PSO permutations against the current specialization configuration. This patch adds support for specialization constants in the Metal backend and provides a generalised high-level solution which can be adopted by other graphics APIs supporting this feature. Authored by Apple: Michael Parkin-White Authored by Blender: Clément Foucault (files in gpu/test folder) Pull Request: https://projects.blender.org/blender/blender/pulls/115193
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