Add methods to retrieve noise parameters for WebGL shaders

Author: hxrshxz

src/math/noise.js

@@ -397,6 +397,22 @@ function noise(p5, fn){
     }
   };
 
+  /**
+   * @private
+   * Returns the current number of octaves used by noise().
+   */
+  fn._getNoiseOctaves = function() {
+    return perlin_octaves;
+  };
+
+  /**
+   * @private
+   * Returns the current falloff factor used by noise().
+   */
+  fn._getNoiseAmpFalloff = function() {
+    return perlin_amp_falloff;
+  };
+
   /**
    * Sets the seed value for the <a href="#/p5/noise">noise()</a> function.
    *

src/strands/strands_api.js

@@ -121,6 +121,20 @@ export function initGlobalStrandsAPI(p5, fn, strandsContext) {
       return originalNoise.apply(this, args); // fallback to regular p5.js noise
     }
 
+    const hasNoiseUniforms = strandsContext.uniforms.some(u => u.name === 'uNoiseOctaves');
+    if (!hasNoiseUniforms) {
+      strandsContext.uniforms.push({
+        name: 'uNoiseOctaves',
+        typeInfo: DataType.int1,
+        defaultValue: () => p5._getNoiseOctaves()
+      });
+      strandsContext.uniforms.push({
+        name: 'uNoiseAmpFalloff',
+        typeInfo: DataType.float1,
+        defaultValue: () => p5._getNoiseAmpFalloff()
+      });
+    }
+
     strandsContext.vertexDeclarations.add(noiseGLSL);
     strandsContext.fragmentDeclarations.add(noiseGLSL);
     // Handle noise(x, y) as noise(vec2)

src/webgl/shaders/functions/noise3DGLSL.glsl

@@ -98,10 +98,11 @@ float noise(vec3 st) {
   float amplitude = 1.0;
   float frequency = 1.0;
 
-  for (int i = 0; i < 4; i++) {
+  for (int i = 0; i < 8; i++) {
+    if (i >= uNoiseOctaves) break;
     result += amplitude * baseNoise(st * frequency);
     frequency *= 2.0;
-    amplitude *= 0.5;
+    amplitude *= uNoiseAmpFalloff;
   }
 
   return result;