| // SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense |
| |
| #import config |
| #import pathtag |
| |
| @group(0) @binding(0) |
| var<uniform> config: Config; |
| |
| @group(0) @binding(1) |
| var<storage> scene: array<u32>; |
| |
| @group(0) @binding(2) |
| var<storage, read_write> reduced: array<TagMonoid>; |
| |
| let LG_WG_SIZE = 8u; |
| let WG_SIZE = 256u; |
| |
| var<workgroup> sh_scratch: array<TagMonoid, WG_SIZE>; |
| |
| @compute @workgroup_size(256) |
| fn main( |
| @builtin(global_invocation_id) global_id: vec3<u32>, |
| @builtin(local_invocation_id) local_id: vec3<u32>, |
| ) { |
| let ix = global_id.x; |
| let tag_word = scene[config.pathtag_base + ix]; |
| var agg = reduce_tag(tag_word); |
| sh_scratch[local_id.x] = agg; |
| for (var i = 0u; i < firstTrailingBit(WG_SIZE); i += 1u) { |
| workgroupBarrier(); |
| if local_id.x + (1u << i) < WG_SIZE { |
| let other = sh_scratch[local_id.x + (1u << i)]; |
| agg = combine_tag_monoid(agg, other); |
| } |
| workgroupBarrier(); |
| sh_scratch[local_id.x] = agg; |
| } |
| if local_id.x == 0u { |
| reduced[ix >> LG_WG_SIZE] = agg; |
| } |
| } |