playcanvas/build/playcanvas.prf/src/scene/shader-lib/glsl/chunks/lit/frag/lightSpecularGGX.js

Open-source WebGL/WebGPU 3D engine for the web

var lightSpecularGGX_default = `
float calcLightSpecular(float gloss, vec3 worldNormal, vec3 viewDir, vec3 h, vec3 lightDirNorm) {
	const float PI = 3.141592653589793;
	float roughness = max((1.0 - gloss) * (1.0 - gloss), 0.001);
	float alpha = roughness * roughness;
	float NoH = max(dot(worldNormal, h), 0.0);
	float NoV = max(dot(worldNormal, viewDir), 0.0);
	float NoL = max(dot(worldNormal, -lightDirNorm), 0.0);
	float NoH2 = NoH * NoH;
	float denom = NoH2 * (alpha - 1.0) + 1.0;
	float D = alpha / (PI * denom * denom);
	float alpha2 = alpha * alpha;
	float lambdaV = NoL * sqrt(NoV * NoV * (1.0 - alpha2) + alpha2);
	float lambdaL = NoV * sqrt(NoL * NoL * (1.0 - alpha2) + alpha2);
	float G = 0.5 / max(lambdaV + lambdaL, 0.00001);
	return D * G;
}
float getLightSpecular(vec3 h, vec3 reflDir, vec3 worldNormal, vec3 viewDir, vec3 lightDirNorm, float gloss, mat3 tbn) {
	return calcLightSpecular(gloss, worldNormal, viewDir, h, lightDirNorm);
}
`;
export {
	lightSpecularGGX_default as default
};