48 lines
1.8 KiB
WebGPU Shading Language
48 lines
1.8 KiB
WebGPU Shading Language
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// rayQuery picking smoke test (WebGPU/DOM software ray-query path).
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//
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// Shoots a single, fully-determined ray at a known TLAS instance through
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// the injected `rayQuery*` shim and records the committed hit into a
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// storage buffer the host reads back. The whole point is to exercise
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// `_rqTraverseTlas`'s TLAS descent for a realistic (< 8193) instance
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// count — the regime where a hardcoded 16384-leaf start makes every node
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// look internal and the pick always misses (issue #25).
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//
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// rayQuery=true ⇒ @group(1) is the reserved RT heap (do NOT declare it).
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// User bindings live at @group(2)+; the optional push uniform at @group(0).
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struct PushData {
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origin: vec3<f32>,
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_p0: f32,
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dir: vec3<f32>,
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_p1: f32,
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};
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@group(0) @binding(0) var<uniform> push : PushData;
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struct PickResult {
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hit: u32, // 1 = committed triangle hit, 0 = miss
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instanceCustomIndex: u32,
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primitiveIndex: u32,
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tHit: f32,
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};
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@group(2) @binding(0) var<storage, read_write> result : PickResult;
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@compute @workgroup_size(1)
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fn main() {
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var rq: RayQuery;
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rayQueryInitialize(&rq, 0u, RT_FLAG_OPAQUE, 0xFFu,
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push.origin, 0.001, push.dir, 10000.0);
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// Software shim resolves the whole traversal in one proceed call.
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while (rayQueryProceed(&rq)) {}
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if (rayQueryGetCommittedIntersectionType(&rq) != RT_INTERSECTION_NONE) {
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result.hit = 1u;
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result.instanceCustomIndex = rayQueryGetCommittedInstanceCustomIndex(&rq);
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result.primitiveIndex = rayQueryGetCommittedPrimitiveIndex(&rq);
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result.tHit = rayQueryGetCommittedT(&rq);
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} else {
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result.hit = 0u;
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result.instanceCustomIndex = 0xFFFFFFFFu;
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result.primitiveIndex = 0xFFFFFFFFu;
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result.tHit = -1.0;
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}
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}
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