Gustavo Roque FacoBackup

Generic 1,2,3 Noise

float rand(float n){return fract(sin(n) * 43758.5453123);}

float noise(float p){
	float fl = floor(p);
  float fc = fract(p);
	return mix(rand(fl), rand(fl + 1.0), fc);
}

	float D_GGX_Anisotropic(float at, float ab, float ToH, float BoH, float NoH) {
	// Burley 2012, "Physically-Based Shading at Disney"
	float a2 = at * ab;
	vec3 d = vec3(ab * ToH, at * BoH, a2 * NoH);
	return saturateMediump(a2 * sq(a2 / dot(d, d)) * (1.0 / PI));
	}

	float V_SmithGGXCorrelated_Anisotropic(float at, float ab, float ToV, float BoV,
	float ToL, float BoL, float NoV, float NoL) {
	// Heitz 2014, "Understanding the Masking-Shadowing Function in Microfacet-Based BRDFs"

	in vec2 v_texcoord; // texture coords
	in vec3 v_normal; // normal
	in vec3 v_binormal; // binormal (for TBN basis calc)
	in vec3 v_pos; // pixel view space position

	out vec4 color;

	layout(std140) uniform Transforms
	{
	mat4x4 world_matrix; // object's world position