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Fix mesh-normal-vector benchmark array access

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mesh-normal-scalar correctly fills sequential values in the output for
triangle cone function, but mesh-normal-vector accidentally reuses the
loop index, which results in writes to every third index of the array
(1, 4, etc.).

This is both slower (as the table turns into a hash map), and incorrect,
especially as we have a scalar version of the benchmark that does the
right thing.
This commit is contained in:
Arseny Kapoulkine 2024-11-08 18:29:17 -08:00
parent e6bf71871a
commit 97b79ac025
1 changed files with 5 additions and 4 deletions
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9
bench/tests/mesh-normal-vector.lua
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@ -86,7 +86,8 @@ function test()
function compute_triangle_cones()
local mesh_area = 0
local i = 1
local pos = 1
for i = 1,#mesh.indices,3 do
local p0 = mesh.vertices[mesh.indices[i]]
local p1 = mesh.vertices[mesh.indices[i + 1]]
@ -100,9 +101,9 @@ function test()
local area = vector.magnitude(normal)
local invarea = (area == 0) and 0 or 1 / area;
mesh.triangle_cone_p[i] = (p0.p + p1.p + p2.p) / 3
mesh.triangle_cone_n[i] = normal * invarea
i += 1
mesh.triangle_cone_p[pos] = (p0.p + p1.p + p2.p) / 3
mesh.triangle_cone_n[pos] = normal * invarea
pos += 1
mesh_area += area
end