Re: libplacebo: shaderc vs glslang

On 8/9/25 3:46 PM, Joe Locash ([email protected] via blfs-dev Mailing 
List) wrote:
> I noticed this when debugging a libplacebo build issue.
>
> After meson ran, glslang was disabled but it's listed as Recommended 
> in the book and I had it installed. It seems that libplacebo prefers 
> shaderc over glslang and will use that if available.
>
> From src/glsl/meson.build:
> if glslang_req.auto() and shaderc.found()
>
>   # we only need one or the other, and shaderc is preferred
>   message('Skipping `glslang` because `shaderc` is available')
>
> shaderc isn't mentioned in libplacebo in the book. If shaderc is 
> prefered upstream it seems more logical to make that Recommended 
> instead of glslang.
>
> Note: I install the full shaderc package, not just the binary.
>
Hi Joe,

On my system it looks like glslang was enabled by default:

libplacebo 7.351.0

   Optional features
     d3d11       : NO
     dovi        : YES
     gl-proc-addr: YES
     glslang     : YES
     lcms        : YES
     libdovi     : NO
     opengl      : YES
     shaderc     : NO
     vk-proc-addr: YES
     vulkan      : YES
     xxhash      : NO


I'm guessing this is because we're only installing the program rather 
than the full package. We might want to consider changing that in the 
future though...

- Doug

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