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This commit moves the front end of the rendering pipeline to a retained model when GPU preprocessing is in use (i.e. by default, except in constrained environments). `RenderMeshInstance` and `MeshUniformData` are stored from frame to frame and are updated only for the entities that changed state. This was rather tricky and requires some careful surgery to keep the data valid in the case of removals. This patch is built on top of Bevy's change detection. Generally, this worked, except that `ViewVisibility` isn't currently properly tracked. Therefore, this commit adds proper change tracking for `ViewVisibility`. Doing this required adding a new system that runs after all `check_visibility` invocations, as no single `check_visibility` invocation has enough global information to detect changes. On the Bistro exterior scene, with all textures forced to opaque, this patch improves steady-state `extract_meshes_for_gpu_building` from 93.8us to 34.5us and steady-state `collect_meshes_for_gpu_building` from 195.7us to 4.28us. Altogether this constitutes an improvement from 290us to 38us, which is a 7.46x speedup.   This patch is only lightly tested and shouldn't land before 0.15 is released anyway, so I'm releasing it as a draft. |
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Bevy PBR
