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Add GLSL-based noise(vec2) function to p5.strands (#7897) #7921

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Merged
merged 10 commits into from
Jul 8, 2025
+41 −1
Merged

Add GLSL-based noise(vec2) function to p5.strands (#7897) #7921

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b924d1c
Add GLSL noise function support in p5.strands via ShaderGenerator
LalitNarayanYadav Jun 18, 2025
9cf4424
Add GLSL implementation of fractal noise for p5.strands
LalitNarayanYadav Jun 18, 2025
4cbf98f
Add custom fn.noise() in p5.strands with conditional GLSL injection
LalitNarayanYadav Jun 21, 2025
6f66939
Fix: Rename noise.glsl.js to noiseGLSL.glsl to avoid Rollup plugin co…
LalitNarayanYadav Jun 27, 2025
3b70b71
Fix: Rename noise.glsl.js to noiseGLSL.glsl to avoid Rollup plugin co…
LalitNarayanYadav Jun 27, 2025
09f307d
Add noiseGLSL to vertexDeclarations for use in vertex shaders
LalitNarayanYadav Jun 27, 2025
df4c546
Refactor fn.noise() to use early return guard for cleaner structure
LalitNarayanYadav Jul 1, 2025
0cd9448
Bridge p5.js noise with GLSL noise in p5.strands
LalitNarayanYadav Jul 5, 2025
fd13238
Add noiseGLSL.glsl with MIT-licensed 2D noise for p5.strands
LalitNarayanYadav Jul 5, 2025
27ebbe3
Update src/webgl/shaders/functions/noiseGLSL.glsl
perminder-17 Jul 8, 2025
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13 changes: 12 additions & 1 deletion src/webgl/ShaderGenerator.js
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
import { parse } from 'acorn';
import { ancestor } from 'acorn-walk';
import escodegen from 'escodegen';
import noiseGLSL from './shaders/functions/noiseGLSL.glsl';

function shadergenerator(p5, fn) {

Expand Down Expand Up @@ -1578,6 +1579,7 @@ function shadergenerator(p5, fn) {
],
'sqrt': { args: ['genType'], returnType: 'genType', isp5Function: true},
'step': { args: ['genType', 'genType'], returnType: 'genType', isp5Function: false},
'noise': { args: ['vec2'], returnType: 'float', isp5Function: false },
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I think in the glsl code, we have a baseNoise() function returning float. So, either you have to rename at the js file or in the glsl file. Probably changing from baseNoise() to noise() in the glsl is what I would prefer.

'trunc': { args: ['genType'], returnType: 'genType', isp5Function: false},

////////// Vector //////////
Expand Down Expand Up @@ -1629,10 +1631,19 @@ function shadergenerator(p5, fn) {
return originalLerp.apply(this, args); // Fallback to normal p5.js lerp
}
};
const originalNoise = fn.noise;
fn.noise = function (...args) {
if (!GLOBAL_SHADER?.isGenerating) {
return originalNoise.apply(this, args); // fallback to regular p5.js noise
}

GLOBAL_SHADER.output.vertexDeclarations.add(noiseGLSL);
GLOBAL_SHADER.output.fragmentDeclarations.add(noiseGLSL);
return fnNodeConstructor('noise', args, { args: ['vec2'], returnType: 'float' });
};
}



export default shadergenerator;

if (typeof p5 !== 'undefined') {
Expand Down
29 changes: 29 additions & 0 deletions src/webgl/shaders/functions/noiseGLSL.glsl
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Original file line number Diff line number Diff line change
@@ -0,0 +1,29 @@
// Based on https://github.com/patriciogonzalezvivo/lygia/blob/main/generative/noise.glsl (MIT)
// Adapted for use in p5.strands

vec2 random2(vec2 st) {
st = vec2(dot(st, vec2(127.1, 311.7)),
dot(st, vec2(269.5, 183.3)));
return -1.0 + 2.0 * fract(sin(st) * 43758.5453123);
}

float noise(vec2 st) {
vec2 i = floor(st);
vec2 f = fract(st);

// Four corners in 2D of a tile
vec2 a = random2(i);
vec2 b = random2(i + vec2(1.0, 0.0));
vec2 c = random2(i + vec2(0.0, 1.0));
vec2 d = random2(i + vec2(1.0, 1.0));

// Smooth interpolation
vec2 u = f * f * (3.0 - 2.0 * f);

// Mix the results
return mix(mix(dot(a, f - vec2(0.0, 0.0)),
dot(b, f - vec2(1.0, 0.0)), u.x),
mix(dot(c, f - vec2(0.0, 1.0)),
dot(d, f - vec2(1.0, 1.0)), u.x), u.y);
}

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