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Julian Eisel c81bc09876 GPU: Avoid undocumented/fragile dependency on shader enumerator order ...

Previously this was using `GPU_SHADER_TEXT` as default value indicating
an "unset" state. This wasn't documented in the definition (and so
D16284 added a new enumerator that broke this). Plus code was assuming
this enumerator would always have the value 0 without specifying this in
the definition either.

In this case it's easy to not rely on the enum value at all, and just
use `std::optional` to add a "unset" state.

Differential Revision: https://developer.blender.org/D16303

2022-10-20 13:17:22 +02:00

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