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More tangent changes

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Dynamitos
2024-12-27 17:06:43 +01:00
parent 7f4d7c7f71
commit f3b6ed31dc
15 changed files with 275 additions and 163 deletions
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res/shaders/lib/BRDF.slang
+21 -21
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@@ -2,7 +2,7 @@ import Common;
interface IBRDF
{
float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor);
float3 evaluate(float3x3 tangentToWorld, float3 viewDir_WS, float3 lightDir_WS, float3 lightColor);
float3 evaluateAmbient();
float getAlpha();
float3 getTangentNormal();
@@ -27,12 +27,12 @@ struct Phong : IBRDF
shininess = 0;
}
float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor)
float3 evaluate(float3x3 tangentToWorld, float3 viewDir_WS, float3 lightDir_WS, float3 lightColor)
{
float3 normal_TS = normal;
float3 nDotL = dot(normal_TS, lightDir_TS);
float3 r = 2 * (nDotL) * normal_TS - lightDir_TS;
float rDotV = dot(r, viewDir_TS);
float3 normal_WS = normalize(mul(tangentToWorld, normal));
float3 nDotL = dot(normal_WS, lightDir_WS);
float3 r = 2 * (nDotL) * normal_WS - lightDir_WS;
float rDotV = dot(r, viewDir_WS);
return lightColor * (baseColor * max(nDotL, 0.0));// + specular * pow(max(rDotV, 0.0), max(shininess, 1)));
}
@@ -70,12 +70,12 @@ struct BlinnPhong : IBRDF
ambient = float3(0, 0, 0);
}
float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor)
float3 evaluate(float3x3 tangentToWorld, float3 viewDir_WS, float3 lightDir_WS, float3 lightColor)
{
float3 normal_TS = normalize(normal);
float diffuse = max(dot(normal_TS, lightDir_TS), 0);
float3 h = normalize(lightDir_TS + viewDir_TS);
float specular = pow(saturate(dot(normal_TS, h)), shininess);
float3 normal_WS = normalize(mul(tangentToWorld, normal));
float diffuse = max(dot(normal_WS, lightDir_WS), 0);
float3 h = normalize(lightDir_WS + viewDir_WS);
float specular = pow(saturate(dot(normal_WS, h)), shininess);
return (baseColor * diffuse * lightColor) + (specularColor * specular);
}
@@ -107,10 +107,10 @@ struct CelShading : IBRDF
normal = float3(0, 0, 1);
}
float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor)
float3 evaluate(float3x3 tangentToWorld, float3 viewDir_WS, float3 lightDir_WS, float3 lightColor)
{
float3 normal_TS = normalize(normal);
float nDotL = dot(normal_TS, lightDir_TS);
float3 normal_WS = normalize(mul(tangentToWorld, normal));
float nDotL = dot(normal_WS, lightDir_WS);
float diffuse = max(nDotL, 0);
float3 darkenedBase = baseColor * 0.8;
@@ -189,21 +189,21 @@ struct CookTorrance : IBRDF
return F0 + (1.0 - F0) * pow(clamp(1.0 - cosTheta, 0.0, 1.0), 5.0);
}
float3 evaluate(float3 viewDir_TS, float3 lightDir_TS, float3 lightColor)
float3 evaluate(float3x3 tangentToWorld, float3 viewDir_WS, float3 lightDir_WS, float3 lightColor)
{
float3 n = normal;//normalize(mul(tbn, normal));
float3 h = normalize(lightDir_TS + viewDir_TS);
float3 n = normalize(mul(tangentToWorld, normal));
float3 h = normalize(lightDir_WS + viewDir_WS);
float3 F0 = float3(0.04);
F0 = lerp(F0, baseColor, metallic);
float3 F = FresnelSchlick(max(dot(h, viewDir_TS), 0.0), F0);
float3 F = FresnelSchlick(max(dot(h, viewDir_WS), 0.0), F0);
float NDF = TrowbridgeReitzGGX(n, h);
float G = Smith(n, viewDir_TS, lightDir_TS);
float G = Smith(n, viewDir_WS, lightDir_WS);
float3 num = NDF * G * F;
float denom = 4.0 * max(dot(n, viewDir_TS), 0.0) * max(dot(n, lightDir_TS), 0.0) + 0.000001;
float denom = 4.0 * max(dot(n, viewDir_WS), 0.0) * max(dot(n, lightDir_WS), 0.0) + 0.000001;
float3 specular = num / denom;
float3 k_s = F;
@@ -211,7 +211,7 @@ struct CookTorrance : IBRDF
k_d *= 1.0 - metallic;
float nDotL = max(dot(n, lightDir_TS), 0.0);
float nDotL = max(dot(n, lightDir_WS), 0.0);
float3 result = (k_d * baseColor / PI + specular) * nDotL * lightColor;
return result * ambientOcclusion;