a46643af0f
Current implementation uses a CPU roundtrip to transfer render result to the Xr Swapchain. This PR adds support for sharing the render result on Linux systems by using file descriptors. To extend this solution to win32 or dx handles can be done by extending the data transfer modes, register the correct extensions. When not using the same GPU between Blender and OpenXR the CPU roundtrip will still be used. Solution has been validated with monado simulator and seems to be as fast as OpenGL. Performance can be improved by using GPU based synchronization. Current API is limited as we cannot chain the different renders and swapchains. Pull Request: https://projects.blender.org/blender/blender/pulls/136933
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