80 lines
2 KiB
GLSL
80 lines
2 KiB
GLSL
// Copyright 2020 Google LLC
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struct RayPayload
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{
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float3 color;
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float distance;
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float3 normal;
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float reflector;
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};
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struct Attributes
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{
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float2 bary;
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};
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RaytracingAccelerationStructure topLevelAS : register(t0);
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struct UBO
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{
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float4x4 viewInverse;
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float4x4 projInverse;
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float4 lightPos;
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int vertexSize;
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};
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cbuffer ubo : register(b2) { UBO ubo; };
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StructuredBuffer<float4> vertices : register(t3);
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StructuredBuffer<uint> indices : register(t4);
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struct Vertex
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{
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float3 pos;
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float3 normal;
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float2 uv;
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float4 color;
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float4 _pad0;
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float4 _pad1;
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};
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Vertex unpack(uint index)
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{
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// Unpack the vertices from the SSBO using the glTF vertex structure
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// The multiplier is the size of the vertex divided by four float components (=16 bytes)
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const int m = ubo.vertexSize / 16;
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float4 d0 = vertices[m * index + 0];
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float4 d1 = vertices[m * index + 1];
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float4 d2 = vertices[m * index + 2];
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Vertex v;
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v.pos = d0.xyz;
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v.normal = float3(d0.w, d1.x, d1.y);
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v.color = float4(d2.x, d2.y, d2.z, 1.0);
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return v;
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}
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[shader("closesthit")]
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void main(inout RayPayload rayPayload, in Attributes attribs)
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{
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uint PrimitiveID = PrimitiveIndex();
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int3 index = int3(indices[3 * PrimitiveID], indices[3 * PrimitiveID + 1], indices[3 * PrimitiveID + 2]);
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Vertex v0 = unpack(index.x);
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Vertex v1 = unpack(index.y);
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Vertex v2 = unpack(index.z);
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// Interpolate normal
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const float3 barycentricCoords = float3(1.0f - attribs.bary.x - attribs.bary.y, attribs.bary.x, attribs.bary.y);
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float3 normal = normalize(v0.normal * barycentricCoords.x + v1.normal * barycentricCoords.y + v2.normal * barycentricCoords.z);
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// Basic lighting
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float3 lightVector = normalize(ubo.lightPos.xyz);
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float dot_product = max(dot(lightVector, normal), 0.6);
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rayPayload.color.rgb = v0.color * dot_product;
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rayPayload.distance = RayTCurrent();
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rayPayload.normal = normal;
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// Objects with full white vertex color are treated as reflectors
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rayPayload.reflector = ((v0.color.r == 1.0f) && (v0.color.g == 1.0f) && (v0.color.b == 1.0f)) ? 1.0f : 0.0f;
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}
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