Full BSDF

leenkx/Shaders/std/gbuffer.glsl

@@ -173,16 +173,85 @@ void unpackFloatInt16(float val, out float f, out uint i) {
 #ifdef _ExtBRDF
 // extended material parameters by material slot ID returns vec4s (28 floats) of extended BRDF parameters
 void getMaterialParams(uint matid, out vec4 p0, out vec4 p1, out vec4 p2, out vec4 p3,
-	out vec4 p4, out vec4 p5, out vec4 p6) {
+	out vec4 p4, out vec4 p5, out vec4 p6, out vec4 p7) {
 	uint base = matid * 8u;
+	#if defined(_Anisotropy) || defined(_Sheen)
 	p0 = materialParams[base];
+	#else
+	p0 = vec4(0.0);
+	#endif
+	#if defined(_ClearCoat)
 	p1 = materialParams[base + 1u];
+	#else
+	p1 = vec4(0.0);
+	#endif
+	#if defined(_ClearCoat) || defined(_Transmission)
 	p2 = materialParams[base + 2u];
+	#else
+	p2 = vec4(0.0);
+	#endif
+	#if defined(_Transmission) || defined(_SSS)
 	p3 = materialParams[base + 3u];
+	#else
+	p3 = vec4(0.0);
+	#endif
+	#if defined(_SSS)
 	p4 = materialParams[base + 4u];
+	#else
+	p4 = vec4(0.0);
+	#endif
+	#if defined(_Sheen) || defined(_SSS)
 	p5 = materialParams[base + 5u];
+	#else
+	p5 = vec4(0.0);
+	#endif
+	#if defined(_ExtBRDF)
 	p6 = materialParams[base + 6u];
+	#else
+	p6 = vec4(0.0);
+	#endif
+	#if defined(_SSS)
+	p7 = materialParams[base + 7u];
+	#else
+	p7 = vec4(0.0);
+	#endif
 }
 #endif
 
+float packIOR(float ior) {
+	return clamp((ior - 1.0) / 1.5, 0.0, 1.0);
+}
+
+float unpackIOR(float packed) {
+	return packed * 1.5 + 1.0;
+}
+
+#ifndef PI
+#define PI 3.1415926535
+#endif
+#ifndef PI2
+#define PI2 6.2831853071
+#endif
+
+float encodeTangent(vec3 tangent, vec3 normal) {
+	if (length(tangent) < 0.5) return -1.0;
+	vec3 t = normalize(tangent);
+	vec3 n = normalize(normal);
+	vec3 ref = abs(n.y) < 0.999 ? vec3(0.0, 1.0, 0.0) : vec3(1.0, 0.0, 0.0);
+	vec3 r = normalize(ref - n * dot(ref, n));
+	vec3 b = cross(n, r);
+	float angle = atan(dot(t, b), dot(t, r));
+	return (angle / (2.0 * PI) + 0.5);
+}
+
+vec3 decodeTangent(float enc, vec3 normal) {
+	if (enc < 0.0) return vec3(1.0, 0.0, 0.0);
+	vec3 n = normalize(normal);
+	vec3 ref = abs(n.y) < 0.999 ? vec3(0.0, 1.0, 0.0) : vec3(1.0, 0.0, 0.0);
+	vec3 r = normalize(ref - n * dot(ref, n));
+	vec3 b = cross(n, r);
+	float angle = (enc - 0.5) * 2.0 * PI;
+	return normalize(r * cos(angle) + b * sin(angle));
+}
+
 #endif