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Examples - Update Compute Fluid to use IndirectStorageBuffer #32176

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Examples - Update Compute Fluid to use IndirectStorageBuffer #32176

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43 changes: 32 additions & 11 deletions examples/webgpu_compute_particles_fluid.html
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,7 @@

import * as THREE from 'three/webgpu';

import { Fn, If, Return, instancedArray, instanceIndex, uniform, attribute, uint, float, clamp, struct, atomicStore, int, ivec3, array, vec3, atomicAdd, Loop, atomicLoad, max, pow, mat3, vec4, cross, step } from 'three/tsl';
import { Fn, If, Return, instancedArray, instanceIndex, uniform, attribute, uint, float, clamp, struct, atomicStore, int, ivec3, array, vec3, atomicAdd, Loop, atomicLoad, max, pow, mat3, vec4, cross, step, storage } from 'three/tsl';

import { Inspector } from 'three/addons/inspector/Inspector.js';

Expand All @@ -48,12 +48,14 @@

const maxParticles = 8192 * 16;
const gridSize1d = 64;
const workgroupSize = 64;
const gridSize = new THREE.Vector3( gridSize1d, gridSize1d, gridSize1d );
const fixedPointMultiplier = 1e7;

let particleCountUniform, stiffnessUniform, restDensityUniform, dynamicViscosityUniform, dtUniform, gravityUniform, gridSizeUniform;
let particleBuffer, cellBuffer, cellBufferFloat;
let clearGridKernel, p2g1Kernel, p2g2Kernel, updateGridKernel, g2pKernel;
let clearGridKernel, p2g1Kernel, p2g2Kernel, updateGridKernel, g2pKernel, workgroupKernel;
let p2g1KernelWorkgroupBuffer, p2g2KernelWorkgroupBuffer, g2pKernelWorkgroupBuffer;
let particleMesh;
const mouseCoord = new THREE.Vector3();
const prevMouseCoord = new THREE.Vector3();
Expand Down Expand Up @@ -105,12 +107,29 @@
setupParticles();

const gui = renderer.inspector.createParameters( 'Settings' );

const numWorkgroups = Math.ceil( params.particleCount / workgroupSize );

p2g1KernelWorkgroupBuffer = new THREE.IndirectStorageBufferAttribute( new Uint32Array( [ numWorkgroups, 1, 1 ] ), 1 );
p2g2KernelWorkgroupBuffer = new THREE.IndirectStorageBufferAttribute( new Uint32Array( [ numWorkgroups, 1, 1 ] ), 1 );
g2pKernelWorkgroupBuffer = new THREE.IndirectStorageBufferAttribute( new Uint32Array( [ numWorkgroups, 1, 1 ] ), 1 );

const p2g1WorkgroupStorage = storage( p2g1KernelWorkgroupBuffer, 'uint', 3 );
const p2g2WorkgroupStorage = storage( p2g2KernelWorkgroupBuffer, 'uint', 3 );
const g2pWorkgroupStorage = storage( g2pKernelWorkgroupBuffer, 'uint', 3 );

workgroupKernel = Fn( () => {

const workgroupsToDispatch = ( particleCountUniform.sub( 1 ) ).div( workgroupSize ).add( 1 );

p2g1WorkgroupStorage.element( 0 ).assign( workgroupsToDispatch );
p2g2WorkgroupStorage.element( 0 ).assign( workgroupsToDispatch );
g2pWorkgroupStorage.element( 0 ).assign( workgroupsToDispatch );

} )().compute( 1 );

gui.add( params, 'particleCount', 4096, maxParticles, 4096 ).onChange( value => {

p2g1Kernel.count = value;
p2g2Kernel.count = value;
g2pKernel.count = value;
particleMesh.count = value;
particleCountUniform.value = value;

Expand Down Expand Up @@ -258,7 +277,7 @@

} );

} )().compute( params.particleCount ).setName( 'p2g1Kernel' );
} )().compute( params.particleCount, [ workgroupSize, 1, 1 ] ).setName( 'p2g1Kernel' );

p2g2Kernel = Fn( () => {

Expand Down Expand Up @@ -329,7 +348,7 @@

} );

} )().compute( params.particleCount ).setName( 'p2g2Kernel' );
} )().compute( params.particleCount, [ workgroupSize, 1, 1 ] ).setName( 'p2g2Kernel' );

updateGridKernel = Fn( () => {

Expand Down Expand Up @@ -477,7 +496,7 @@
particleBuffer.element( instanceIndex ).get( 'position' ).assign( particlePosition );
particleBuffer.element( instanceIndex ).get( 'velocity' ).assign( particleVelocity );

} )().compute( params.particleCount ).setName( 'g2pKernel' );
} )().compute( params.particleCount, [ workgroupSize, 1, 1 ] ).setName( 'g2pKernel' );

}

Expand Down Expand Up @@ -561,12 +580,14 @@

prevMouseCoord.copy( mouseCoord );

renderer.compute( workgroupKernel );

//renderer.compute( [ clearGridKernel, p2g1Kernel, p2g2Kernel, updateGridKernel, g2pKernel ] );
renderer.compute( clearGridKernel );
renderer.compute( p2g1Kernel );
renderer.compute( p2g2Kernel );
renderer.compute( p2g1Kernel, p2g1KernelWorkgroupBuffer );
renderer.compute( p2g2Kernel, p2g2KernelWorkgroupBuffer );
renderer.compute( updateGridKernel );
renderer.compute( g2pKernel );
renderer.compute( g2pKernel, g2pKernelWorkgroupBuffer );

renderer.render( scene, camera );

Expand Down