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radv/bvh: Prevent NANs when computing node cost

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Otherwise the degenerate geometry workaround never triggers, leading to bad performance.

Fixes: 6f45c98b ("radv/bvh: Adjust sah cost based on depth")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/20723>
This commit is contained in:
Friedrich Vock
2023-01-16 11:14:44 +01:00
committed by Marge Bot
parent 4c7caa6211
commit 684eee0748
1 changed files with 3 additions and 0 deletions
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src/amd/vulkan/bvh/ploc_internal.comp
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@@ -198,6 +198,9 @@ combined_node_cost(uint32_t lds_base, uint32_t i, uint32_t j)
combined_bounds.max = max(shared_bounds[i - lds_base].max, shared_bounds[j - lds_base].max);
float area = aabb_surface_area(combined_bounds);
if (area == 0.0)
return 0.0;
/* p_a and p_b are the probabilities that i or j are hit by a ray:
* Assuming that the current node is hit (p = 1) and the probability of hitting a node
* is proportional to its surface area, p = area * c with p = 1 for the current node.