From 15265a50d2a22e273942f64ebf4f1f82dec384ce Mon Sep 17 00:00:00 2001
From: Ryan McDonough <peanut64646@gmail.com>
Date: Wed, 31 Jan 2024 16:07:47 -0500
Subject: [PATCH] Add NoiseLib.glslib to Common/ShaderLib in jme3-core

---
 .../Common/ShaderLib/NoiseLib.glsllib         | 107 ++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 jme3-core/src/main/resources/Common/ShaderLib/NoiseLib.glsllib

diff --git a/jme3-core/src/main/resources/Common/ShaderLib/NoiseLib.glsllib b/jme3-core/src/main/resources/Common/ShaderLib/NoiseLib.glsllib
new file mode 100644
index 0000000000..2fc6444872
--- /dev/null
+++ b/jme3-core/src/main/resources/Common/ShaderLib/NoiseLib.glsllib
@@ -0,0 +1,107 @@
+//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;
+}
\ No newline at end of file