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WebGPUBackend.js
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WebGPUBackend.js
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/*// debugger tools
import 'https://greggman.github.io/webgpu-avoid-redundant-state-setting/webgpu-check-redundant-state-setting.js';
//*/
import { GPUFeatureName, GPULoadOp, GPUStoreOp, GPUIndexFormat, GPUTextureViewDimension } from './utils/WebGPUConstants.js';
import WGSLNodeBuilder from './nodes/WGSLNodeBuilder.js';
import Backend from '../common/Backend.js';
import WebGPUUtils from './utils/WebGPUUtils.js';
import WebGPUAttributeUtils from './utils/WebGPUAttributeUtils.js';
import WebGPUBindingUtils from './utils/WebGPUBindingUtils.js';
import WebGPUPipelineUtils from './utils/WebGPUPipelineUtils.js';
import WebGPUTextureUtils from './utils/WebGPUTextureUtils.js';
import { WebGPUCoordinateSystem } from '../../constants.js';
//
class WebGPUBackend extends Backend {
constructor( parameters = {} ) {
super( parameters );
this.isWebGPUBackend = true;
// some parameters require default values other than "undefined"
this.parameters.alpha = ( parameters.alpha === undefined ) ? true : parameters.alpha;
this.parameters.requiredLimits = ( parameters.requiredLimits === undefined ) ? {} : parameters.requiredLimits;
this.trackTimestamp = ( parameters.trackTimestamp === true );
this.device = null;
this.context = null;
this.colorBuffer = null;
this.defaultRenderPassdescriptor = null;
this.utils = new WebGPUUtils( this );
this.attributeUtils = new WebGPUAttributeUtils( this );
this.bindingUtils = new WebGPUBindingUtils( this );
this.pipelineUtils = new WebGPUPipelineUtils( this );
this.textureUtils = new WebGPUTextureUtils( this );
this.occludedResolveCache = new Map();
}
async init( renderer ) {
await super.init( renderer );
//
const parameters = this.parameters;
// create the device if it is not passed with parameters
let device;
if ( parameters.device === undefined ) {
const adapterOptions = {
powerPreference: parameters.powerPreference
};
const adapter = await navigator.gpu.requestAdapter( adapterOptions );
if ( adapter === null ) {
throw new Error( 'WebGPUBackend: Unable to create WebGPU adapter.' );
}
// feature support
const features = Object.values( GPUFeatureName );
const supportedFeatures = [];
for ( const name of features ) {
if ( adapter.features.has( name ) ) {
supportedFeatures.push( name );
}
}
const deviceDescriptor = {
requiredFeatures: supportedFeatures,
requiredLimits: parameters.requiredLimits
};
device = await adapter.requestDevice( deviceDescriptor );
} else {
device = parameters.device;
}
const context = ( parameters.context !== undefined ) ? parameters.context : renderer.domElement.getContext( 'webgpu' );
this.device = device;
this.context = context;
const alphaMode = parameters.alpha ? 'premultiplied' : 'opaque';
this.trackTimestamp = this.trackTimestamp && this.hasFeature( GPUFeatureName.TimestampQuery );
this.context.configure( {
device: this.device,
format: this.utils.getPreferredCanvasFormat(),
usage: GPUTextureUsage.RENDER_ATTACHMENT | GPUTextureUsage.COPY_SRC,
alphaMode: alphaMode
} );
this.updateSize();
}
get coordinateSystem() {
return WebGPUCoordinateSystem;
}
async getArrayBufferAsync( attribute ) {
return await this.attributeUtils.getArrayBufferAsync( attribute );
}
getContext() {
return this.context;
}
_getDefaultRenderPassDescriptor() {
let descriptor = this.defaultRenderPassdescriptor;
if ( descriptor === null ) {
const renderer = this.renderer;
descriptor = {
colorAttachments: [ {
view: null
} ],
};
if ( this.renderer.depth === true || this.renderer.stencil === true ) {
descriptor.depthStencilAttachment = {
view: this.textureUtils.getDepthBuffer( renderer.depth, renderer.stencil ).createView()
};
}
const colorAttachment = descriptor.colorAttachments[ 0 ];
if ( this.renderer.samples > 0 ) {
colorAttachment.view = this.colorBuffer.createView();
} else {
colorAttachment.resolveTarget = undefined;
}
this.defaultRenderPassdescriptor = descriptor;
}
const colorAttachment = descriptor.colorAttachments[ 0 ];
if ( this.renderer.samples > 0 ) {
colorAttachment.resolveTarget = this.context.getCurrentTexture().createView();
} else {
colorAttachment.view = this.context.getCurrentTexture().createView();
}
return descriptor;
}
_getRenderPassDescriptor( renderContext ) {
const renderTarget = renderContext.renderTarget;
const renderTargetData = this.get( renderTarget );
let descriptors = renderTargetData.descriptors;
if ( descriptors === undefined ||
renderTargetData.width !== renderTarget.width ||
renderTargetData.height !== renderTarget.height ||
renderTargetData.activeMipmapLevel !== renderTarget.activeMipmapLevel ||
renderTargetData.samples !== renderTarget.samples
) {
descriptors = {};
renderTargetData.descriptors = descriptors;
// dispose
const onDispose = () => {
renderTarget.removeEventListener( 'dispose', onDispose );
this.delete( renderTarget );
};
renderTarget.addEventListener( 'dispose', onDispose );
}
const cacheKey = renderContext.getCacheKey();
let descriptor = descriptors[ cacheKey ];
if ( descriptor === undefined ) {
const textures = renderContext.textures;
const colorAttachments = [];
for ( let i = 0; i < textures.length; i ++ ) {
const textureData = this.get( textures[ i ] );
const textureView = textureData.texture.createView( {
baseMipLevel: renderContext.activeMipmapLevel,
mipLevelCount: 1,
baseArrayLayer: renderContext.activeCubeFace,
dimension: GPUTextureViewDimension.TwoD
} );
let view, resolveTarget;
if ( textureData.msaaTexture !== undefined ) {
view = textureData.msaaTexture.createView();
resolveTarget = textureView;
} else {
view = textureView;
resolveTarget = undefined;
}
colorAttachments.push( {
view,
resolveTarget,
loadOp: GPULoadOp.Load,
storeOp: GPUStoreOp.Store
} );
}
descriptor = {
colorAttachments,
};
if ( renderContext.depth ) {
const depthTextureData = this.get( renderContext.depthTexture );
const depthStencilAttachment = {
view: depthTextureData.texture.createView()
};
descriptor.depthStencilAttachment = depthStencilAttachment;
}
descriptors[ cacheKey ] = descriptor;
renderTargetData.width = renderTarget.width;
renderTargetData.height = renderTarget.height;
renderTargetData.samples = renderTarget.samples;
renderTargetData.activeMipmapLevel = renderTarget.activeMipmapLevel;
}
return descriptor;
}
beginRender( renderContext ) {
const renderContextData = this.get( renderContext );
const device = this.device;
const occlusionQueryCount = renderContext.occlusionQueryCount;
let occlusionQuerySet;
if ( occlusionQueryCount > 0 ) {
if ( renderContextData.currentOcclusionQuerySet ) renderContextData.currentOcclusionQuerySet.destroy();
if ( renderContextData.currentOcclusionQueryBuffer ) renderContextData.currentOcclusionQueryBuffer.destroy();
// Get a reference to the array of objects with queries. The renderContextData property
// can be changed by another render pass before the buffer.mapAsyc() completes.
renderContextData.currentOcclusionQuerySet = renderContextData.occlusionQuerySet;
renderContextData.currentOcclusionQueryBuffer = renderContextData.occlusionQueryBuffer;
renderContextData.currentOcclusionQueryObjects = renderContextData.occlusionQueryObjects;
//
occlusionQuerySet = device.createQuerySet( { type: 'occlusion', count: occlusionQueryCount } );
renderContextData.occlusionQuerySet = occlusionQuerySet;
renderContextData.occlusionQueryIndex = 0;
renderContextData.occlusionQueryObjects = new Array( occlusionQueryCount );
renderContextData.lastOcclusionObject = null;
}
let descriptor;
if ( renderContext.textures === null ) {
descriptor = this._getDefaultRenderPassDescriptor();
} else {
descriptor = this._getRenderPassDescriptor( renderContext );
}
this.initTimestampQuery( renderContext, descriptor );
descriptor.occlusionQuerySet = occlusionQuerySet;
const depthStencilAttachment = descriptor.depthStencilAttachment;
if ( renderContext.textures !== null ) {
const colorAttachments = descriptor.colorAttachments;
for ( let i = 0; i < colorAttachments.length; i ++ ) {
const colorAttachment = colorAttachments[ i ];
if ( renderContext.clearColor ) {
colorAttachment.clearValue = i === 0 ? renderContext.clearColorValue : { r: 0, g: 0, b: 0, a: 1 };
colorAttachment.loadOp = GPULoadOp.Clear;
colorAttachment.storeOp = GPUStoreOp.Store;
} else {
colorAttachment.loadOp = GPULoadOp.Load;
colorAttachment.storeOp = GPUStoreOp.Store;
}
}
} else {
const colorAttachment = descriptor.colorAttachments[ 0 ];
if ( renderContext.clearColor ) {
colorAttachment.clearValue = renderContext.clearColorValue;
colorAttachment.loadOp = GPULoadOp.Clear;
colorAttachment.storeOp = GPUStoreOp.Store;
} else {
colorAttachment.loadOp = GPULoadOp.Load;
colorAttachment.storeOp = GPUStoreOp.Store;
}
}
//
if ( renderContext.depth ) {
if ( renderContext.clearDepth ) {
depthStencilAttachment.depthClearValue = renderContext.clearDepthValue;
depthStencilAttachment.depthLoadOp = GPULoadOp.Clear;
depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;
} else {
depthStencilAttachment.depthLoadOp = GPULoadOp.Load;
depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;
}
}
if ( renderContext.stencil ) {
if ( renderContext.clearStencil ) {
depthStencilAttachment.stencilClearValue = renderContext.clearStencilValue;
depthStencilAttachment.stencilLoadOp = GPULoadOp.Clear;
depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;
} else {
depthStencilAttachment.stencilLoadOp = GPULoadOp.Load;
depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;
}
}
//
const encoder = device.createCommandEncoder( { label: 'renderContext_' + renderContext.id } );
const currentPass = encoder.beginRenderPass( descriptor );
//
renderContextData.descriptor = descriptor;
renderContextData.encoder = encoder;
renderContextData.currentPass = currentPass;
renderContextData.currentSets = { attributes: {}, bindingGroups: [], pipeline: null, index: null };
renderContextData.renderBundles = [];
//
if ( renderContext.viewport ) {
this.updateViewport( renderContext );
}
if ( renderContext.scissor ) {
const { x, y, width, height } = renderContext.scissorValue;
currentPass.setScissorRect( x, y, width, height );
}
}
finishRender( renderContext ) {
const renderContextData = this.get( renderContext );
const occlusionQueryCount = renderContext.occlusionQueryCount;
if ( renderContextData.renderBundles.length > 0 ) {
renderContextData.currentPass.executeBundles( renderContextData.renderBundles );
}
if ( occlusionQueryCount > renderContextData.occlusionQueryIndex ) {
renderContextData.currentPass.endOcclusionQuery();
}
renderContextData.currentPass.end();
if ( occlusionQueryCount > 0 ) {
const bufferSize = occlusionQueryCount * 8; // 8 byte entries for query results
//
let queryResolveBuffer = this.occludedResolveCache.get( bufferSize );
if ( queryResolveBuffer === undefined ) {
queryResolveBuffer = this.device.createBuffer(
{
size: bufferSize,
usage: GPUBufferUsage.QUERY_RESOLVE | GPUBufferUsage.COPY_SRC
}
);
this.occludedResolveCache.set( bufferSize, queryResolveBuffer );
}
//
const readBuffer = this.device.createBuffer(
{
size: bufferSize,
usage: GPUBufferUsage.COPY_DST | GPUBufferUsage.MAP_READ
}
);
// two buffers required here - WebGPU doesn't allow usage of QUERY_RESOLVE & MAP_READ to be combined
renderContextData.encoder.resolveQuerySet( renderContextData.occlusionQuerySet, 0, occlusionQueryCount, queryResolveBuffer, 0 );
renderContextData.encoder.copyBufferToBuffer( queryResolveBuffer, 0, readBuffer, 0, bufferSize );
renderContextData.occlusionQueryBuffer = readBuffer;
//
this.resolveOccludedAsync( renderContext );
}
this.prepareTimestampBuffer( renderContext, renderContextData.encoder );
this.device.queue.submit( [ renderContextData.encoder.finish() ] );
//
if ( renderContext.textures !== null ) {
const textures = renderContext.textures;
for ( let i = 0; i < textures.length; i ++ ) {
const texture = textures[ i ];
if ( texture.generateMipmaps === true ) {
this.textureUtils.generateMipmaps( texture );
}
}
}
}
isOccluded( renderContext, object ) {
const renderContextData = this.get( renderContext );
return renderContextData.occluded && renderContextData.occluded.has( object );
}
async resolveOccludedAsync( renderContext ) {
const renderContextData = this.get( renderContext );
// handle occlusion query results
const { currentOcclusionQueryBuffer, currentOcclusionQueryObjects } = renderContextData;
if ( currentOcclusionQueryBuffer && currentOcclusionQueryObjects ) {
const occluded = new WeakSet();
renderContextData.currentOcclusionQueryObjects = null;
renderContextData.currentOcclusionQueryBuffer = null;
await currentOcclusionQueryBuffer.mapAsync( GPUMapMode.READ );
const buffer = currentOcclusionQueryBuffer.getMappedRange();
const results = new BigUint64Array( buffer );
for ( let i = 0; i < currentOcclusionQueryObjects.length; i ++ ) {
if ( results[ i ] !== BigInt( 0 ) ) {
occluded.add( currentOcclusionQueryObjects[ i ] );
}
}
currentOcclusionQueryBuffer.destroy();
renderContextData.occluded = occluded;
}
}
updateViewport( renderContext ) {
const { currentPass } = this.get( renderContext );
const { x, y, width, height, minDepth, maxDepth } = renderContext.viewportValue;
currentPass.setViewport( x, y, width, height, minDepth, maxDepth );
}
clear( color, depth, stencil, renderTargetData = null ) {
const device = this.device;
const renderer = this.renderer;
let colorAttachments = [];
let depthStencilAttachment;
let clearValue;
let supportsDepth;
let supportsStencil;
if ( color ) {
const clearColor = this.getClearColor();
if ( this.renderer.alpha === true ) {
// premultiply alpha
const a = clearColor.a;
clearValue = { r: clearColor.r * a, g: clearColor.g * a, b: clearColor.b * a, a: a };
} else {
clearValue = { r: clearColor.r, g: clearColor.g, b: clearColor.b, a: clearColor.a };
}
}
if ( renderTargetData === null ) {
supportsDepth = renderer.depth;
supportsStencil = renderer.stencil;
const descriptor = this._getDefaultRenderPassDescriptor();
if ( color ) {
colorAttachments = descriptor.colorAttachments;
const colorAttachment = colorAttachments[ 0 ];
colorAttachment.clearValue = clearValue;
colorAttachment.loadOp = GPULoadOp.Clear;
colorAttachment.storeOp = GPUStoreOp.Store;
}
if ( supportsDepth || supportsStencil ) {
depthStencilAttachment = descriptor.depthStencilAttachment;
}
} else {
supportsDepth = renderTargetData.depth;
supportsStencil = renderTargetData.stencil;
if ( color ) {
for ( const texture of renderTargetData.textures ) {
const textureData = this.get( texture );
const textureView = textureData.texture.createView();
let view, resolveTarget;
if ( textureData.msaaTexture !== undefined ) {
view = textureData.msaaTexture.createView();
resolveTarget = textureView;
} else {
view = textureView;
resolveTarget = undefined;
}
colorAttachments.push( {
view,
resolveTarget,
clearValue,
loadOp: GPULoadOp.Clear,
storeOp: GPUStoreOp.Store
} );
}
}
if ( supportsDepth || supportsStencil ) {
const depthTextureData = this.get( renderTargetData.depthTexture );
depthStencilAttachment = {
view: depthTextureData.texture.createView()
};
}
}
//
if ( supportsDepth ) {
if ( depth ) {
depthStencilAttachment.depthLoadOp = GPULoadOp.Clear;
depthStencilAttachment.depthClearValue = renderer.getClearDepth();
depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;
} else {
depthStencilAttachment.depthLoadOp = GPULoadOp.Load;
depthStencilAttachment.depthStoreOp = GPUStoreOp.Store;
}
}
//
if ( supportsStencil ) {
if ( stencil ) {
depthStencilAttachment.stencilLoadOp = GPULoadOp.Clear;
depthStencilAttachment.stencilClearValue = renderer.getClearStencil();
depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;
} else {
depthStencilAttachment.stencilLoadOp = GPULoadOp.Load;
depthStencilAttachment.stencilStoreOp = GPUStoreOp.Store;
}
}
//
const encoder = device.createCommandEncoder( {} );
const currentPass = encoder.beginRenderPass( {
colorAttachments,
depthStencilAttachment
} );
currentPass.end();
device.queue.submit( [ encoder.finish() ] );
}
// compute
beginCompute( computeGroup ) {
const groupGPU = this.get( computeGroup );
const descriptor = {};
this.initTimestampQuery( computeGroup, descriptor );
groupGPU.cmdEncoderGPU = this.device.createCommandEncoder();
groupGPU.passEncoderGPU = groupGPU.cmdEncoderGPU.beginComputePass( descriptor );
}
compute( computeGroup, computeNode, bindings, pipeline ) {
const { passEncoderGPU } = this.get( computeGroup );
// pipeline
const pipelineGPU = this.get( pipeline ).pipeline;
passEncoderGPU.setPipeline( pipelineGPU );
// bind groups
for ( let i = 0, l = bindings.length; i < l; i ++ ) {
const bindGroup = bindings[ i ];
const bindingsData = this.get( bindGroup );
passEncoderGPU.setBindGroup( i, bindingsData.group );
}
const maxComputeWorkgroupsPerDimension = this.device.limits.maxComputeWorkgroupsPerDimension;
const computeNodeData = this.get( computeNode );
if ( computeNodeData.dispatchSize === undefined ) computeNodeData.dispatchSize = { x: 0, y: 1, z: 1 };
const { dispatchSize } = computeNodeData;
if ( computeNode.dispatchCount > maxComputeWorkgroupsPerDimension ) {
dispatchSize.x = Math.min( computeNode.dispatchCount, maxComputeWorkgroupsPerDimension );
dispatchSize.y = Math.ceil( computeNode.dispatchCount / maxComputeWorkgroupsPerDimension );
} else {
dispatchSize.x = computeNode.dispatchCount;
}
passEncoderGPU.dispatchWorkgroups(
dispatchSize.x,
dispatchSize.y,
dispatchSize.z
);
}
finishCompute( computeGroup ) {
const groupData = this.get( computeGroup );
groupData.passEncoderGPU.end();
this.prepareTimestampBuffer( computeGroup, groupData.cmdEncoderGPU );
this.device.queue.submit( [ groupData.cmdEncoderGPU.finish() ] );
}
// render object
draw( renderObject, info ) {
const { object, context, pipeline } = renderObject;
const bindings = renderObject.getBindings();
const renderContextData = this.get( context );
const pipelineGPU = this.get( pipeline ).pipeline;
const currentSets = renderContextData.currentSets;
const passEncoderGPU = renderContextData.currentPass;
const drawParms = renderObject.getDrawParameters();
if ( drawParms === null ) return;
// pipeline
if ( currentSets.pipeline !== pipelineGPU ) {
passEncoderGPU.setPipeline( pipelineGPU );
currentSets.pipeline = pipelineGPU;
}
// bind groups
const currentBindingGroups = currentSets.bindingGroups;
for ( let i = 0, l = bindings.length; i < l; i ++ ) {
const bindGroup = bindings[ i ];
const bindingsData = this.get( bindGroup );
if ( currentBindingGroups[ bindGroup.index ] !== bindGroup.id ) {
passEncoderGPU.setBindGroup( bindGroup.index, bindingsData.group );
currentBindingGroups[ bindGroup.index ] = bindGroup.id;
}
}
// attributes
const index = renderObject.getIndex();
const hasIndex = ( index !== null );
// index
if ( hasIndex === true ) {
if ( currentSets.index !== index ) {
const buffer = this.get( index ).buffer;
const indexFormat = ( index.array instanceof Uint16Array ) ? GPUIndexFormat.Uint16 : GPUIndexFormat.Uint32;
passEncoderGPU.setIndexBuffer( buffer, indexFormat );
currentSets.index = index;
}
}
// vertex buffers
const vertexBuffers = renderObject.getVertexBuffers();
for ( let i = 0, l = vertexBuffers.length; i < l; i ++ ) {
const vertexBuffer = vertexBuffers[ i ];
if ( currentSets.attributes[ i ] !== vertexBuffer ) {
const buffer = this.get( vertexBuffer ).buffer;
passEncoderGPU.setVertexBuffer( i, buffer );
currentSets.attributes[ i ] = vertexBuffer;
}
}
// occlusion queries - handle multiple consecutive draw calls for an object
if ( renderContextData.occlusionQuerySet !== undefined ) {
const lastObject = renderContextData.lastOcclusionObject;
if ( lastObject !== object ) {
if ( lastObject !== null && lastObject.occlusionTest === true ) {
passEncoderGPU.endOcclusionQuery();
renderContextData.occlusionQueryIndex ++;
}
if ( object.occlusionTest === true ) {
passEncoderGPU.beginOcclusionQuery( renderContextData.occlusionQueryIndex );
renderContextData.occlusionQueryObjects[ renderContextData.occlusionQueryIndex ] = object;
}
renderContextData.lastOcclusionObject = object;
}
}
// draw
if ( object.isBatchedMesh === true ) {
const starts = object._multiDrawStarts;
const counts = object._multiDrawCounts;
const drawCount = object._multiDrawCount;
const drawInstances = object._multiDrawInstances;
const bytesPerElement = hasIndex ? index.array.BYTES_PER_ELEMENT : 1;
for ( let i = 0; i < drawCount; i ++ ) {
const count = drawInstances ? drawInstances[ i ] : 1;
const firstInstance = count > 1 ? 0 : i;
passEncoderGPU.drawIndexed( counts[ i ], count, starts[ i ] / bytesPerElement, 0, firstInstance );
}
} else if ( hasIndex === true ) {
const { vertexCount: indexCount, instanceCount, firstVertex: firstIndex } = drawParms;
passEncoderGPU.drawIndexed( indexCount, instanceCount, firstIndex, 0, 0 );
info.update( object, indexCount, instanceCount );
} else {
const { vertexCount, instanceCount, firstVertex } = drawParms;
passEncoderGPU.draw( vertexCount, instanceCount, firstVertex, 0 );
info.update( object, vertexCount, instanceCount );
}
}
// cache key
needsRenderUpdate( renderObject ) {
const data = this.get( renderObject );
const { object, material } = renderObject;
const utils = this.utils;