General

CZ_REAM_GAPI: Overrides the graphics API selection when CZ::RCore is initialized with RGraphicsAPI::Auto. Accepted values are GL (OpenGL), VK (Vulkan), and RS (Raster).

Debugging

CZ_REAM_LOG_LEVEL: Sets the minimum log level for runtime output. Accepts an integer from least to most verbose: 0 Silent, 1 Fatal, 2 Error, 3 Warning, 4 Info, 5 Debug, 6 Trace.
CZ_REAM_EGL_LOG_LEVEL: Same scale as CZ_REAM_LOG_LEVEL, but for the OpenGL/EGL backend.
CZ_REAM_VK_LOG_LEVEL: Same scale as CZ_REAM_LOG_LEVEL, but for the Vulkan backend. When raised, the Vulkan validation layers (if installed) are enabled and their messages are routed through the logger.

CZ_REAM_VK_ALLOW_CPU: Set to 1 to allow selecting CPU/software Vulkan devices (e.g. llvmpipe). Disabled by default, since software devices are usually undesirable for a compositor; useful for testing and headless setups.
CZ_REAM_VK_SYNC_SUBMIT: Set to 1 to force synchronous (blocking) command submission in the Vulkan painter instead of the default asynchronous, fence-tracked submission. Intended for debugging and A/B performance comparisons.