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OpenGL ES rendering target
Vulkan support should take care of modern high-end hardware and 'modern' mobile devices.
Within the libre gaming community, there is a desire to run games on fairly old/integrated cards. Some of these lack support for anything past OpenGL 2.0, developing for OpenGL 2.0 isn't suitable for anything remotely recent (Fixed Function Pipeline, deprecated).
OpenGL ES is a lighter-weight rendering target that might offer a solution for low-end mobile and FOSS-only desktops/laptops.