60 lines
2.5 KiB
HLSL
60 lines
2.5 KiB
HLSL
/*
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contributors: [Patricio Gonzalez Vivo, Shadi El Hajj]
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description: Calculate point light
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use: <void> lightPointEvaluate(<LightPoint> L, <Material> mat, inout <ShadingData> shadingData)
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options:
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- DIFFUSE_FNC: diffuseOrenNayar, diffuseBurley, diffuseLambert (default)
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- SURFACE_POSITION: in glslViewer is v_position
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- LIGHT_POSITION: in glslViewer is u_light
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- LIGHT_COLOR: in glslViewer is u_lightColor
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- LIGHT_INTENSITY: in glslViewer is u_lightIntensity
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- LIGHT_FALLOFF: in glslViewer is u_lightFalloff
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license:
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Prosperity License - https://prosperitylicense.com/versions/3.0.0
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- Copyright (c) 2021 Patricio Gonzalez Vivo under Patron License - https://lygia.xyz/license
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*/
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#include "../specular.hlsl"
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#include "../diffuse.hlsl"
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#include "falloff.hlsl"
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#ifndef FNC_LIGHT_POINT
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#define FNC_LIGHT_POINT
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void lightPointEvaluate(LightPoint L, Material mat, inout ShadingData shadingData) {
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float Ldist = length(L.position);
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float3 Ldirection = L.position/Ldist;
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shadingData.L = Ldirection;
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shadingData.H = normalize(Ldirection + shadingData.V);
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shadingData.NoL = saturate(dot(shadingData.N, Ldirection));
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shadingData.NoH = saturate(dot(shadingData.N, shadingData.H));
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#ifdef FNC_RAYMARCH_SOFTSHADOW
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float shadow = raymarchSoftShadow(mat.position, Ldirection);
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#else
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float shadow = 1.0;
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#endif
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float dif = diffuse(shadingData);
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float3 spec = specular(shadingData);
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float3 lightContribution = L.color * L.intensity * shadow * shadingData.NoL;
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if (L.falloff > 0.0)
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lightContribution *= falloff(Ldist, L.falloff);
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shadingData.directDiffuse += max(float3(0.0, 0.0, 0.0), shadingData.diffuseColor * lightContribution * dif);
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shadingData.directSpecular += max(float3(0.0, 0.0, 0.0), lightContribution * spec) * shadingData.energyCompensation;
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// TODO:
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// - make sure that the shadow use a perspective projection
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#ifdef SHADING_MODEL_SUBSURFACE
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float scatterVoH = saturate(dot(shadingData.V, -Ldirection));
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float forwardScatter = exp2(scatterVoH * mat.subsurfacePower - mat.subsurfacePower);
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float backScatter = saturate(shadingData.NoL * mat.subsurfaceThickness + (1.0 - mat.subsurfaceThickness)) * 0.5;
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float subsurface = lerp(backScatter, 1.0, forwardScatter) * (1.0 - mat.subsurfaceThickness);
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shadingData.directDiffuse += mat.subsurfaceColor * (subsurface * diffuseLambertConstant());
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#endif
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}
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#endif
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