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* Remove non-IR codegen paths (#398)Tim Foley2018-02-03
| | | | | | | | | | | | | | | | The basic change is simple: remove support for all code generation paths other than the IR. There is a lot of vestigial code left, but the main logic in `ast-legalize.*` is gone. Doing this breaks a *lot* of tests, for various reasons: - We can no longer guarantee exactly matching DXBC or SPIR-V output after things pass through out IR - Many builtins don't have matching versions defined for GLSL output via IR (even when they had versions defined via the earlier approach that worked with the AST) - A lot of code creates intermediate values of opaque types in the IR, which turn into opaque-type temporaries that aren't allowed (this breaks many GLSL tests, but also some HLSL) I implemented some small fixes for issues that I could get working in the time I had, but most of the above are larger than made sense to fix in this commit. For now I'm disabling the tests that cause problems, but we will need to make a concerted effort to get things working on this new substrate if we are going to make good on our goals.
* Pick correct GLSL version when `gl_Layer` usedTim Foley2017-07-17
`gl_Layer` as a fragment input requires at least version 4.30 of GLSL, so we try to track that information when we see the name used. Note that this does *not* override a user-specified `#version` line. This required re-ordering when lowering happens relative to emitting the `#version` directive, since this code works by actually modifying the chosen profile for the entry point. Yes, that is kind of gross and we should do something cleaner in the long term.