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Fixes to fine rasterization

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The area bug was found and fixed by @dfrg, and is adapted from #239. I wanted to move it to a separate PR so that one would be more focused on API.

The other bug is currently silent because the two quantities swapped are both 4, but it is triggered when experimenting with tuning for performance.
This commit is contained in:
Raph Levien 2023-01-08 07:41:01 -08:00
parent 480e5a5e2f
commit 29a16eb210
1 changed files with 3 additions and 2 deletions
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5
shader/fine.wgsl
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@ -138,7 +138,7 @@ fn fill_path(tile: Tile, xy: vec2<f32>) -> array<f32, PIXELS_PER_THREAD> {
}
// nonzero winding rule
for (var i = 0u; i < PIXELS_PER_THREAD; i += 1u) {
area[i] = abs(area[i]);
area[i] = min(abs(area[i]), 1.0);
}
return area;
}
@ -169,6 +169,7 @@ fn stroke_path(seg: u32, half_width: f32, xy: vec2<f32>) -> array<f32, PIXELS_PE
return df;
}
// The X size should be 16 / PIXELS_PER_THREAD
@compute @workgroup_size(4, 16)
fn main(
@builtin(global_invocation_id) global_id: vec3<u32>,
@ -179,7 +180,7 @@ fn main(
let xy = vec2(f32(global_id.x * PIXELS_PER_THREAD), f32(global_id.y));
#ifdef full
var rgba: array<vec4<f32>, PIXELS_PER_THREAD>;
var blend_stack: array<array<u32, BLEND_STACK_SPLIT>, PIXELS_PER_THREAD>;
var blend_stack: array<array<u32, PIXELS_PER_THREAD>, BLEND_STACK_SPLIT>;
var clip_depth = 0u;
var area: array<f32, PIXELS_PER_THREAD>;
var cmd_ix = tile_ix * PTCL_INITIAL_ALLOC;