| # Enabling Metal validation layers | |
| To enable Metal's validation layers in both ANGLE's standalone test | |
| suites as well as in Chromium's GPU process, per [this | |
| CL](https://chromium-review.googlesource.com/c/chromium/src/+/3584863), | |
| set the following environment variables: | |
| ``` | |
| MTL_DEBUG_LAYER=1 | |
| MTL_DEBUG_LAYER_VALIDATE_LOAD_ACTIONS=1 | |
| MTL_DEBUG_LAYER_VALIDATE_STORE_ACTIONS=1 | |
| MTL_DEBUG_LAYER_VALIDATE_UNRETAINED_RESOURCES=4 | |
| ``` |