Added Shaderc Implementation

[sjcobb2022]

Hi there,

I needed shaderc for building my project so I implemented it here. It took a lot of attempts so I made this new branch with a nice clean commit tree.

There is one caveat however, being that llvm on macOS doesn't compile. I guess this isn't a problem yet though, since MoltenVK isn't implemented yet.

That's it really, it works fine now in my projects.

[sjcobb2022]

After some quick debugging the implementation now compiles to debug. Added additional input to specify Release or Debug

[sjcobb2022]

Hi @humbletim. After spending a lot more time trying to fix things, I have found this. KhronosGroup/glslang#2863 essentially stating that we can't use the combined lib directly. Consequently I don't think that my method is possible right now. This is also apparent in the shaderc vcpkg port in which they remove the compiling of the combined library.

https://github.com/microsoft/vcpkg/blob/dc9d737351f916eb349e7bc85671d3dba4043399/ports/shaderc/fix-build-type.patch#L56.

One "fix" for this would to point shaderc to glslang_SOURC_DIR and spirv-tools_SOURCE_DIR, which would take a longer time but would function. I think this is the implementaiton I will try and implement in a second.

btw sorry for the radio silence, I have been moving country for uni.

[sjcobb2022]

@humbletim This is all complete and works in windows, linux and mac. I cleaned up all my debugging code so everything should be good to go.

I ended up simply directing shaderc to the location of the Glslang and SPIRV-Tools source directories. the linux vulkanSDK executable follows a similar process, however it re-clones the SPIRV-Tools and Glslang directories. Our method is a lot more storage efficient and time efficient since it does not need to re-clone the libraries.

I'll see if I have the time to build any of the other missing deps in the future, but for now I think I'll spend some more time on my own projects.

[Qubaef]

@humbletim are there any plans to merge this PR? I need this feature and I would like to know if it will be ready anytime soon.

[humbletim]

@sjcobb2022 this looks great! i've scheduled some time this week to dive deeper, test drive and hopefully merge this into a new release.

some TODOs on my side:

• update .github/workflow CI tests to also cover shaderc scenarios
• update readme.md to reflect shaderc in the available components list
• generate a new tagged action release

[sjcobb2022]

@humbletim linking to shaderc is a bit annoying since it doesn't generate a FindShaderc.cmake file or anything. Here is my very messy way to link to shaderc on any platform. For implementation it should be as simple as

#include <shaderc/shaderc.hpp>