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perf: optimize multipleSplats perfomance

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Reduces buffer swaps from O(2N) to O(2), N = number of splats

Minimizes expensive WebGL context state changes

Processes all velocity updates first to keep similar operations contiguous then handles all dye updates for better texture cache utilization
This commit is contained in:
Timofey Gelazoniya
2025-01-29 05:50:08 +03:00
parent dc3462a864
commit 57e731a7b9
1 changed files with 33 additions and 3 deletions
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36
public/fluid.js
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@ -2,7 +2,7 @@
MIT License
Copyright (c) 2017 Pavel Dobryakov
Copyright (c) 2021 Timofey Gelazoniya
Copyright (c) 2021-2025 Timofey Gelazoniya
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
@ -30,7 +30,7 @@ const canvas = document.getElementsByTagName("canvas")[0];
resizeCanvas();
let config = {
SIM_RESOLUTION: 128,
SIM_RESOLUTION: 256,
DYE_RESOLUTION: 1024,
CAPTURE_RESOLUTION: 512,
DENSITY_DISSIPATION: 1,
@ -79,6 +79,7 @@ pointers.push(new pointerPrototype());
const { gl, ext } = getWebGLContext(canvas);
if (isMobile()) {
config.SIM_RESOLUTION = 128;
config.DYE_RESOLUTION = 512;
}
@ -1560,6 +1561,7 @@ function splatPointer(pointer) {
}
function multipleSplats(amount) {
const splatData = [];
for (let i = 0; i < amount; i++) {
const color = generateColor();
color.r *= 10.0;
@ -1569,8 +1571,36 @@ function multipleSplats(amount) {
const y = Math.random();
const dx = 1000 * (Math.random() - 0.5);
const dy = 1000 * (Math.random() - 0.5);
splat(x, y, dx, dy, color);
splatData.push({ x, y, dx, dy, color });
}
splatProgram.bind();
gl.uniform1i(splatProgram.uniforms.uTarget, velocity.read.attach(0));
gl.uniform1f(splatProgram.uniforms.aspectRatio, canvas.width / canvas.height);
gl.uniform1f(
splatProgram.uniforms.radius,
correctRadius(config.SPLAT_RADIUS / 100.0)
);
splatData.forEach((data) => {
gl.uniform2f(splatProgram.uniforms.point, data.x, data.y);
gl.uniform3f(splatProgram.uniforms.color, data.dx, data.dy, 0.0);
blit(velocity.write);
});
velocity.swap();
gl.uniform1i(splatProgram.uniforms.uTarget, dye.read.attach(0));
splatData.forEach((data) => {
gl.uniform2f(splatProgram.uniforms.point, data.x, data.y);
gl.uniform3f(
splatProgram.uniforms.color,
data.color.r,
data.color.g,
data.color.b
);
blit(dye.write);
});
dye.swap();
}
function splat(x, y, dx, dy, color) {