Respect the XDG base directory specification’s environment variables

[linkmauve]

As of 177d595, RenderDoc creates a ~/.local/share/vulkan/implicit_layer.d/renderdoc_capture.json file, no matter the value of $XDG_DATA_HOME.

It should first check the value of $XDG_DATA_HOME, if it’s an absolute path create the file in $XDG_DATA_HOME/vulkan/implicit_layer.d/renderdoc_capture.json, otherwise use the curent path.

See https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables for more information.

[baldurk]

This should be fixed on v1.x now - if $XDG_DATA_HOME is set and exists as a path it's used in preference.

Please check this on the latest v1.x nightly build or compile manually from v1.x, and let me know if you have any further issues.

[linkmauve]

I just tested, there is still one issue which is when the user manually sets $XDG_DATA_HOME to a non-existent directory, for testing or for greater separation, it is ignored altogether.

The solution would be to replace FileIO::exists(xdg) with a check that the path is just absolute, since that’s the only requirement.

[baldurk]

Is there anything to clarify explicitly what the behaviour should be? The spec isn't worded well, the only time it mentions directories existing or being created is at the end which seems to only refer to $XDG_RUNTIME_DIR which is a bit different.

It wouldn't be useful to set the dir to something unique or different to any other application, since then the layer wouldn't get picked up by the loader when the vulkan application runs.

[baldurk]

v1.0 has now released, including the change as described above.

[nyorain]

The vulkan shader cache and other files are still stored/expected in ~/.renderdoc. I guess this function would have to change. Probably best to use XDG_CONFIG_HOME since some config files seem to be stored there but then the shader cache would be a bit out of place.

[linkmauve]

Shader cache would have to go into $XDG_CACHE_HOME/renderdoc/ instead.

[shmerl]

I was testing renderdoc 1.2 recently, and it still creates $HOME/.renderdoc/vkshaders.cache. Is it fixed in 1.4? Debian testing is still a bit behind the last version due to freeze.

If XDG variables are not set, the cache should go into $HOME/.cache/renderdoc, config should go to $HOME/.config/renderdoc and runtime data if any in $HOME/.local/share/renderdoc.

[astralchan]

The current code creates ~/.renderdoc. If XDG compliance is desired, it's typically read via:

configPath <- getenv(XDG_CONFIG_HOME)
if configPath is NULL
    configPath <- getenv(HOME) + ".config"

configPath += "renderdoc"

At the moment, that line of code from earlier I linked always does:

rdcstr ret = homedir + "/.renderdoc/";

[baldurk]

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