gl: add PlatformOSMesa as an offscreen context #8161
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For GL+Linux, PlatformGLX will try to open an X11 window regardless of whether we are doing headless/offscreen rendering or not. Here we add an OSMesa platform, which will allow us to avoid opening any window on Linux. This is particularly useful for situation where a display is not available, like for CI. One important detail is that even though we are displaying through a window, we keep the SDL2 dependency in tact for gltf_viewer. This is due to the fact that gltf_viewer is built upon FilamentApp, which is heavily integrated with SDL2. This is mostly ok since we won't be hitting any path for opening a window due to gltf_viewer's existing support for headless mode.
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For GL+Linux, PlatformGLX will try to open an X11 window regardless of whether we are doing headless/offscreen rendering or not.
Here we add an OSMesa platform, which will allow us to avoid opening any window on Linux. This is particularly useful for situation where a display is not available, like for CI.
One important detail is that even though we are displaying through a window, we keep the SDL2 dependency in tact for gltf_viewer. This is due to the fact that gltf_viewer is built upon FilamentApp, which is heavily integrated with SDL2. This is mostly ok since we won't be hitting any path for opening a window due to gltf_viewer's existing support for headless mode.