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two helper functions for choosing EGL configs: - one for choosing a config for GBM window surfaces (that match the exact GBM pixel format) - one for choosing a config for pbuffer surfaces, which have no EGL_NATIVE_VISUAL_ID, so you can only try to match the r,g,b,a bit size. require `EGL_KHR_no_config_context`, the workaround if it's not supported was untested anyways, and it doesn't really work with offscreen render surfaces.
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add offscreen (MESA_platform_surfaceless) rendering surface
use that in case there's no hardware GPU present
refactor egl config selection
necessary for creating complete offscreen surfaces (pbuffer surfaces)
offscreen rendering is useful for CI tests