webgpu sponza

examples/Sponza/closesthit.glsl

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+#version 460
+#extension GL_EXT_ray_tracing : enable
+#extension GL_EXT_shader_image_load_formatted : enable
+#extension GL_EXT_shader_explicit_arithmetic_types_int16 : enable
+#extension GL_EXT_descriptor_heap : enable
+#extension GL_EXT_nonuniform_qualifier : enable
+
+// Specialization constant: descriptor-heap slot of the albedo texture.
+// Set from descriptorHeap.bufferStartElement + the slot allocated for
+// the Image2D<RGBA8> on the host side. Sampling uses gl_HitAttributeEXT
+// barycentrics as UVs — proof-of-binding rather than UV-correct shading.
+// Per-vertex UV interpolation lands when Mesh on Vulkan exposes the
+// data-region buffer.
+layout(constant_id = 0) const uint16_t albedoSlot = 0us;
+layout(descriptor_heap) uniform sampler2D albedo[];
+
+hitAttributeEXT vec2 hitAttrs;
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+
+void main() {
+    vec2 bary = vec2(hitAttrs.x, hitAttrs.y);
+    hitValue = texture(albedo[albedoSlot], bary).rgb;
+}