compiler-explorer

mirror of https://github.com/compiler-explorer/compiler-explorer.git synced 2025-12-27 12:54:00 -05:00

Files

Jeremy Ong d928bccf5a Add preliminary HLSL support (#3932 )

* Add preliminary HLSL support

- Adds a new language mode to monaco, extending the base C++ layer with
HLSL intrinsics and types
- Adds a new `HLSLCompiler` class
- Adds a sample pixel shader

The compiler used to test this locally is the [DirectX Shader
Compiler](https://github.com/microsoft/DirectXShaderCompiler) (aka DXC),
which needs to also be added to the
[infra](https://github.com/compiler-explorer/infra) project.

Some guidance is needed before this PR can be merged:

1. While DXC can run on Linux, there are no binaries available so this
compiler must be built. Are there examples that show how we should do
this as part of the infra CI/CD? Should we build and host it
separately instead? The build process for DXC on Linux is relatively
straightforward and documented
[here](https://github.com/microsoft/DirectXShaderCompiler/blob/main/docs/DxcOnUnix.rst).
2. The example code doesn't compile unless the user also supplies
additional compiler flags `-T ps_6_6 -E PSMain`. Is there a way to
load these flags conditionally only if the sample is loaded?
3. Technically, DXC emits DXIL IR (based on LLVM IR) and I am wondering
if it's possible to extend an existing LLVM backend. In addition, the
`-spirv` compiler flag could be emitted to target the SPIR-V backend
instead, so I'm curious if there is a good way to express the target
backend.