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WebGPU RT: port Sponza to wavefront (shadow ray in SHADE)

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Restructure Sponza for the wavefront model: raygen emits the primary ray;
closesthit (in SHADE) gathers albedo/normal, accumulates ambient, and
emits a shadow ray carrying the pending direct term; miss adds the sky
(primary) or the direct term (shadow miss). resolve.wgsl applies the same
Reinhard+gamma the megakernel raygen did inline. User bindings moved to
group 3 (groups 0..2 reserved). RTPass maxDepth=2.

Renders the atrium correctly through the wavefront pipeline (textures,
two-sided shading, sun+ambient, shadows, tonemap).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
catbot 2026-05-31 20:16:04 +00:00
commit 376e66aeed
6 changed files with 70 additions and 134 deletions
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12
examples/Sponza/miss.wgsl
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@ -1,16 +1,12 @@
// Sponza miss (runs in SHADE). Primary miss → two-stop sky gradient.
// Shadow miss → the sun is unoccluded, so add the pending direct term.
fn miss_main(ray: RayDesc, payload: ptr<function, Payload>) {
if ((*payload).shadowRay == 1u) {
// Shadow ray escaped to infinity — the sun is visible from the
// origin, so the surface there should pick up full direct light.
// raygen reads color.x as the visibility coefficient.
(*payload).color = vec3<f32>(1.0);
rtAccumulate((*payload).color);
return;
}
// Primary miss: cheap two-stop sky gradient. (*payload).hit stays 0
// so raygen knows to skip the lighting path and just use this color.
let t = clamp(ray.direction.y * 0.5 + 0.5, 0.0, 1.0);
let sky = vec3<f32>(0.45, 0.65, 0.95);
let zenith = vec3<f32>(0.95, 0.85, 0.65);
(*payload).color = mix(sky, zenith, t);
rtAccumulate(mix(sky, zenith, t));
}