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MetalBackendShaders.md

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Metal Backend Shaders

ANGLE's Metal backend provides a couple of features for inspecting the Metal Shading Language (MSL) produced by ANGLE's shader translator.

printMetalShaders

The printMetalShaders feature, which can be enabled in Chromium via the command line argument --enable-angle-features=printMetalShaders, dumps the blob cache key and translated MSL for all shaders compiled by ANGLE. This is currently used to regenerate precompiled shaders shipped with Chrome.

Environment variable

Setting the environment variable ANGLE_METAL_PRINT_MSL_ENABLE to 1 indicates to the Metal backend to print the translated shaders as they're compiled:

export ANGLE_METAL_PRINT_MSL_ENABLE=1
/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --use-angle=metal

To pass this environment to WebKit / Safari's GPU process, set the environment variable __XPC_ANGLE_METAL_PRINT_MSL_ENABLE to 1:

export __XPC_ANGLE_METAL_PRINT_MSL_ENABLE=1
/Applications/Safari\ Technology\ Preview.app/Contents/MacOS/Safari\ Technology\ Preview