If the application doesn't pick a specific renderer to use, this variable specifies the name of the
preferred renderer. If the preferred renderer can't be initialized, creating a renderer will fail.
This variable is case insensitive and can be set to the following values:
• "direct3d"
• "direct3d11"
• "direct3d12"
• "opengl"
• "opengles2"
• "opengles"
• "metal"
• "vulkan"
• "gpu"
• "software"
This hint accepts a comma-separated list of driver names, and each will be tried in the order listed when
creating a renderer until one succeeds or all of them fail.
The default varies by platform, but it's the first one in the list that is available on the current
platform.
This hint should be set before creating a renderer.