Adding iOS runtime about shaderc-rs HOT 10 CLOSED

Hey @seivan, that sounds good to me! But I'm not familiar with iOS and its development. So contributions welcomed! :)

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So the initial question would be, can shaderc (and all its dependency) run on arm?

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Well, Shaderc can be used for runtime compilation on Android: https://developer.android.com/ndk/guides/graphics/shader-compilers#runtime

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@antiagainst So the issue here is to get the Shaderc project to build for arm/iOS - is that something that's related to this crate?

Edit so Shaderc and all its dependencies would have to build for arm. My initial issue was not having access to glslang at runtime.

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AFAICT, Shaderc right now does not support compilation on iOS, or no one has tried it. To make it (the C++ project) compile on iOS is not something that should go into this crate. But this crate itself (the Rust wrapper) also lacks iOS support.

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@seivan I know this is an older issue, but I believe I was able to compile and use this crate for ios via Rendy and gfx-hal.

See the PR for example code here:

https://github.com/amethyst/rendy/pull/218/files

There were some issues building this crate so see the README I included there.

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@bschwind I've already managed to get it to work but I had to change a lot of the upstream dependencies (like glslang) - did you manage to make it work without doing so?

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I had to modify a CMakeCache.txt file to change the CMAKE_OSX_SYSROOT environment variable to point to an iOS SDK instead of the MacOS one.

I didn't need to make any other changes. It built and ran on iOS so I'm assuming it all went well.

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This looks like it will fix this issue rust-lang/cmake-rs#88

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Closing given #83 is landed.

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