Vulkan implicit sampler fixups (#686)

* Fix sampler-less texture functions (#685)

* Fix sampler-less texeture functions

I'm honestly not sure how the original work on this feature in #648 worked at all (probably insufficient testing).

We have these front-end modifiers to indicate that a particular function definition requires a certain GLSL version, or a GLSL extension in order to be used, and they are supposed to be automatically employed by the logic in `emit.cpp` to output `#extension` lines in the output GLSL. However, it turns out that nothing is actually wired up right now, so that adding the modifiers to a declaration is a placebo.

This change propagates the modifiers through as decorations, and then uses them during GLSL code emit, which allows the functions that require `EXT_samplerless_texture_functions` to work.

* fixup: 32-bit warning

* Add serialization support for GLSL extension/version decorations

0 files changed, 0 insertions, 0 deletions