60 lines
1.4 KiB
Text
60 lines
1.4 KiB
Text
/* Copyright (c) 2025, Sascha Willems
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*
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* SPDX-License-Identifier: MIT
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*
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*/
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RaytracingAccelerationStructure accelStruct;
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RWTexture2D<float4> image;
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struct CameraProperties
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{
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float4x4 viewInverse;
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float4x4 projInverse;
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};
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ConstantBuffer<CameraProperties> cam;
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struct Attributes
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{
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float2 bary;
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};
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struct Payload
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{
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float3 hitValue;
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};
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[shader("raygeneration")]
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void raygenerationMain()
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{
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uint3 LaunchID = DispatchRaysIndex();
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uint3 LaunchSize = DispatchRaysDimensions();
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const float2 pixelCenter = float2(LaunchID.xy) + float2(0.5, 0.5);
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const float2 inUV = pixelCenter/float2(LaunchSize.xy);
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float2 d = inUV * 2.0 - 1.0;
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float4 target = mul(cam.projInverse, float4(d.x, d.y, 1, 1));
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RayDesc rayDesc;
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rayDesc.Origin = mul(cam.viewInverse, float4(0,0,0,1)).xyz;
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rayDesc.Direction = mul(cam.viewInverse, float4(normalize(target.xyz), 0)).xyz;
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rayDesc.TMin = 0.001;
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rayDesc.TMax = 10000.0;
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Payload payload;
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TraceRay(accelStruct, RAY_FLAG_FORCE_OPAQUE, 0xff, 0, 0, 0, rayDesc, payload);
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image[int2(LaunchID.xy)] = float4(payload.hitValue, 0.0);
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}
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[shader("closesthit")]
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void closesthitMain(inout Payload p, in Attributes attribs)
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{
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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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p.hitValue = barycentricCoords;
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}
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[shader("miss")]
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void missMain(inout Payload p)
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{
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p.hitValue = float3(0.0, 0.0, 0.2);
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}
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