ef3ceb3629
This PR implements #126353; In short: keep discard list as part of swap chain images. This allows better determination when resources are actually not in use anymore. ## Resource pool Resource pools keep track of the resources for a swap chain image. In Blender this is a bit more complicated due to the way GPUContext work. A single thread can have multiple contexts. Some of them have a swap chain (GHOST Window) other don't (draw manager). The resource pool should be shared between the contexts running on the same thread. When opening multiple windows there are also multiple swap chains to consider. ### Discard pile Resource handles that are deleted and stored in the discard pile. When we are sure that these resources are not used on the GPU anymore these are destroyed. ### Reusable resources There are other resources as well like: - Descriptor sets - Descriptor pools ## Open issues There are some limitations that require future PRs to fix including: - Background rendering - Handling multiple windows - Improve CPU/GPU synchronization - Reuse staging buffers Pull Request: https://projects.blender.org/blender/blender/pulls/126353
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