Fixes#1642.
Since 1d textures cannot have mipmaps, MSL requires that the `level` argument to
texel accesses and dimension queries be a constexpr 0. For our purposes, just
omit the level argument altogether.
* Add a way to emit errors with a path
I am using `naga` in my build script to validate all of my shaders, and it would be nice to be able to display the file path inside of the diagnostic, so I added a method `emit_to_stderr_with_path` to `naga::front::wgsl::ParserError`.
* change path to &str
* fix rustfmt
* glsl-in: Remove unneeded mutability from reference
* glsl-in: Fix composite constructors
In the recent rework of the constructors it seems that the logic for
composite types (arrays and structs) was accidentally removed by me.
* [hlsl-out] Write `mad` intrinsic for `fma` function
- This should be enough because we only support f32 for now.
- Adds a new test for WGSL functions, in the spirit of operators.wgsl.
- Closes#1579
* Add FMA feature to glsl backend
- I think this is right. Just iterate all known expressions in all
functions and entry points to locate any `fma` function call.
Should not need to walk the statement DAG.
* Transform GLSL fma function into an airthmetic expression when necessary
* Add tests for GLSL fma function tranformation
* Remove the hazard comment from the webgl test input
* Add helper method for fma function support checks
* Address review comment
* Add FindLsb / FindMsb
* Fixes and tests for FindLsb/FindMsb
* Add findLsb / findMsb as WGSL builtins
* Fix tests
* Fix incompatible type issue with MSL output
* Requested changes
* Test fewer cases of findLsb/findMsb
The IR doesn't allow having structs has bindings for entry point
input/output, so the glsl frontend must flatten them.
Glsl defines that the locations are sequential from the block base location.
