68 lines
1.8 KiB
Plaintext
68 lines
1.8 KiB
Plaintext
import Common;
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import BRDF;
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import MaterialParameter;
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interface ILightEnv
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{
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float3 illuminate<B:IBRDF>(LightingParameter input, B brdf);
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};
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struct DirectionalLight : ILightEnv
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{
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float4 color;
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float4 direction;
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float3 illuminate<B:IBRDF>(LightingParameter params, B brdf)
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{
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float3 lightDir_TS = mul(params.tbn, direction.xyz);
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return brdf.evaluate(params.tbn, params.viewDir_TS, -normalize(lightDir_TS), color.xyz);
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}
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};
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struct PointLight : ILightEnv
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{
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float4 position_WS;
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float4 colorRange;
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float3 illuminate<B:IBRDF>(LightingParameter params, B brdf)
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{
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float3 lightDir_WS = params.position_WS - position_WS.xyz;
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float3 lightDir_TS = mul(params.tbn, lightDir_WS);
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float d = length(lightDir_TS);
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float illuminance = max(1 - d / colorRange.w, 0);
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return illuminance * brdf.evaluate(params.tbn, params.viewDir_TS, -normalize(lightDir_TS), colorRange.xyz);
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}
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bool insidePlane(Plane plane, float3 position)
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{
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return dot(plane.n, position) - plane.d < -colorRange.w;
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}
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bool insideFrustum(Frustum frustum, float3 position, float minDepth, float maxDepth)
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{
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bool result = true;
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if(position.z - colorRange.w > minDepth || position.z + colorRange.w < maxDepth)
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{
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result = false;
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}
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for(int i = 0; i < 4 && result; ++i)
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{
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if(insidePlane(frustum.sides[i], position))
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{
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result = false;
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}
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}
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return result;
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}
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};
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struct LightEnv
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{
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StructuredBuffer<DirectionalLight> directionalLights;
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uint numDirectionalLights;
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StructuredBuffer<PointLight> pointLights;
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uint numPointLights;
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};
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layout(set=3)
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ParameterBlock<LightEnv> pLightEnv;
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