Common.MatDefs.Terrain.NoiseLib.glsllib Maven / Gradle / Ivy

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//2d noise functions
float rand(float n){return fract(sin(n) * 43758.5453123);}
float rand(vec2 n) { 
	return fract(sin(dot(n, vec2(12.9898, 4.1414))) * 43758.5453);
}

float noise(vec2 n) {
	const vec2 d = vec2(0.0, 1.0);
  vec2 b = floor(n), f = smoothstep(vec2(0.0), vec2(1.0), fract(n));
	return mix(mix(rand(b), rand(b + d.yx), f.x), mix(rand(b + d.xy), rand(b + d.yy), f.x), f.y);
}


float prand(vec2 c){
	return fract(sin(dot(c.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

float pnoise(vec2 p, float freqPct){
	//float unit = circ/freq;
        float unit = freqPct;

	vec2 ij = floor(p/unit);
	vec2 xy = mod(p,unit)/unit;
	//xy = 3.*xy*xy-2.*xy*xy*xy;
	xy = .5*(1.-cos(3.1415926535*xy));
	float a = prand((ij+vec2(0.,0.)));
	float b = prand((ij+vec2(1.,0.)));
	float c = prand((ij+vec2(0.,1.)));
	float d = prand((ij+vec2(1.,1.)));
	float x1 = mix(a, b, xy.x);
	float x2 = mix(c, d, xy.x);
	return mix(x1, x2, xy.y);
}
    
float rand2D(in vec2 co){
    return fract(sin(dot(co.xy ,vec2(12.9898,78.233))) * 43758.5453);
}

// - - - - 

//3d noise functions
float rand3D(in vec3 co){
    return fract(sin(dot(co.xyz ,vec3(12.9898,78.233,144.7272))) * 43758.5453);
}
    
float simple_interpolate(in float a, in float b, in float x)
{
   return a + smoothstep(0.0,1.0,x) * (b-a);
}
float interpolatedNoise3D(in float x, in float y, in float z)
{
    float integer_x = x - fract(x);
    float fractional_x = x - integer_x;

    float integer_y = y - fract(y);
    float fractional_y = y - integer_y;

    float integer_z = z - fract(z);
    float fractional_z = z - integer_z;

    float v1 = rand3D(vec3(integer_x, integer_y, integer_z));
    float v2 = rand3D(vec3(integer_x+1.0, integer_y, integer_z));
    float v3 = rand3D(vec3(integer_x, integer_y+1.0, integer_z));
    float v4 = rand3D(vec3(integer_x+1.0, integer_y +1.0, integer_z));

    float v5 = rand3D(vec3(integer_x, integer_y, integer_z+1.0));
    float v6 = rand3D(vec3(integer_x+1.0, integer_y, integer_z+1.0));
    float v7 = rand3D(vec3(integer_x, integer_y+1.0, integer_z+1.0));
    float v8 = rand3D(vec3(integer_x+1.0, integer_y +1.0, integer_z+1.0));

    float i1 = simple_interpolate(v1,v5, fractional_z);
    float i2 = simple_interpolate(v2,v6, fractional_z);
    float i3 = simple_interpolate(v3,v7, fractional_z);
    float i4 = simple_interpolate(v4,v8, fractional_z);

    float ii1 = simple_interpolate(i1,i2,fractional_x);
    float ii2 = simple_interpolate(i3,i4,fractional_x);

    return simple_interpolate(ii1 , ii2 , fractional_y);
}

float Noise3D(in vec3 coord, in float wavelength)
{
   return interpolatedNoise3D(coord.x/wavelength, coord.y/wavelength, coord.z/wavelength);
}


//used to reference the same float generated by noise for all shaders, so affliction appears to spread and splat naturally
float getStaticNoiseVar0(vec3 wPos, float afflictionVar){
    float noiseVar0 = Noise3D(wPos, 28);
    float noiseVar1 = Noise3D(wPos, 3);
    float noiseVar2 = Noise3D(wPos, 0.8);

    float noiseVar = ((noiseVar0 + noiseVar1) * 0.4) + (noiseVar2 * 0.2 * afflictionVar);


    if(noiseVar > 0.7){
        noiseVar -= noiseVar2 * 0.07;
     //   noiseVar = min(noiseVar, 0.3);

    }

    noiseVar = min(noiseVar, 1.0);
     noiseVar = max(noiseVar, 0.0);
    
    return noiseVar;
}