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Deduplicate lighting shader

This commit is contained in:
Szymon Nowakowski 2023-08-13 23:52:15 +02:00
parent fb4c8e8dfd
commit fdf4e1b870
1 changed files with 31 additions and 28 deletions
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59
src/shader.ts
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@ -237,6 +237,26 @@ fn toneMapAcesNarkowicz(color: vec3<f32>) -> vec3<f32> {
return saturate((color * (A * color + B)) / (color * (C * color + D) + E));
}
fn lightOutgoingRadiance(
viewDirectionVS: vec3<f32>, actualNormalVS: vec3<f32>, dotNV: f32,
baseColor: vec3<f32>, alpha: f32, metallic: f32, f0: vec3<f32>,
incomingRadiance: vec3<f32>, lightDirectionVS: vec3<f32>,
) -> vec3<f32> {
let halfVectorVS = normalize(lightDirectionVS + viewDirectionVS);
let dotVH = saturate(dot(viewDirectionVS, halfVectorVS));
let dotNH = saturate(dot(actualNormalVS, halfVectorVS));
let dotNL = saturate(dot(actualNormalVS, lightDirectionVS));
let fresnel = fresnelSchlick(dotVH, f0);
let visibility = visibilityGGX(dotNL, dotNV, alpha);
let distribution = distributionGGX(dotNH, alpha);
let scatteredFactor = (1.0 - fresnel) * (1.0 - metallic) * baseColor * INV_PI;
let reflectedFactor = fresnel * visibility * distribution;
return (scatteredFactor + reflectedFactor) * incomingRadiance * dotNL;
}
fn screenSpaceMatrixTStoVS(positionVS: vec3<f32>, normalVS: vec3<f32>, texCoord: vec2<f32>) -> mat3x3<f32> {
let q0 = dpdx(positionVS);
let q1 = dpdy(positionVS);
@ -344,43 +364,26 @@ fn frag(fragment: Varyings) -> @location(0) vec2<f32> {
let lightDirectionVS = normalize(lightPositionVS - positionVS);
let lightDistance = distance(positionVS, lightPositionVS);
let lightAttenuation = 1.0 / (lightDistance * lightDistance);
let halfVectorVS = normalize(lightDirectionVS + viewDirectionVS);
let incomingRadiance = light.color * lightAttenuation;
let dotVH = saturate(dot(viewDirectionVS, halfVectorVS));
let dotNH = saturate(dot(actualNormalVS, halfVectorVS));
let dotNL = saturate(dot(actualNormalVS, lightDirectionVS));
let incomingRadiance = light.color * attenuation;
let fresnel = fresnelSchlick(dotVH, f0);
let visibility = visibilityGGX(dotNL, dotNV, alpha);
let distribution = distributionGGX(dotNH, alpha);
let scatteredFactor = (1.0 - fresnel) * (1.0 - metallic) * baseColor * INV_PI;
let reflectedFactor = fresnel * visibility * distribution;
outgoingRadiance += (scatteredFactor + reflectedFactor) * incomingRadiance * dotNL;
outgoingRadiance += lightOutgoingRadiance(
viewDirectionVS, actualNormalVS, dotNV,
baseColor, alpha, metallic, f0,
incomingRadiance, lightDirectionVS,
);
}
for (var i: u32 = 0; i < _Global.directionalLightCount; ++i) {
let light = _DirectionalLights[i];
let lightDirectionVS = normalize((_Global.matrixWStoVS * vec4(light.directionWS, 0.0)).xyz);
let halfVectorVS = normalize(lightDirectionVS + viewDirectionVS);
let dotVH = saturate(dot(viewDirectionVS, halfVectorVS));
let dotNH = saturate(dot(actualNormalVS, halfVectorVS));
let incomingRadiance = light.color;
let fresnel = fresnelSchlick(dotVH, f0);
let visibility = visibilityGGX(dotNL, dotNV, alpha);
let distribution = distributionGGX(dotNH, alpha);
let scatteredFactor = (1.0 - fresnel) * (1.0 - metallic) * baseColor * INV_PI;
let reflectedFactor = fresnel * visibility * distribution;
outgoingRadiance += (scatteredFactor + reflectedFactor) * incomingRadiance * dotNL;
outgoingRadiance += lightOutgoingRadiance(
viewDirectionVS, actualNormalVS, dotNV,
baseColor, alpha, metallic, f0,
incomingRadiance, lightDirectionVS,
);
}
outgoingRadiance += _Global.ambientLight * baseColor * occlusion;