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# Objective - Using multiple raster passes to generate the depth pyramid is extremely slow - Pulling data from the source image is the largest bottleneck, it's important to sample in a cache-aware pattern - Barriers and pipeline drain between the raster passes is the second largest bottleneck - Each separate RenderPass on the CPU is _really_ expensive ## Solution - Port [FidelityFX SPD](https://gpuopen.com/fidelityfx-spd) to WGSL, replacing meshlet's existing multiple raster passes with a ~~single~~ two compute dispatches. Lack of coherent buffers means we have to do the the last 64x64 tile from mip 7+ in a separate dispatch to ensure the mip 6 writes were flushed :( - Workgroup shared memory version only at the moment, as the subgroup operation is blocked by our upgrade to wgpu 0.20 #13186 - Don't enforce a power-of-2 depth pyramid texture size, simply scaling by 0.5 is fine |
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Bevy PBR
