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WGSLNodeBuilder.js
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WGSLNodeBuilder.js
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import NodeUniformsGroup from '../../common/nodes/NodeUniformsGroup.js';
import NodeSampler from '../../common/nodes/NodeSampler.js';
import { NodeSampledTexture, NodeSampledCubeTexture, NodeSampledTexture3D } from '../../common/nodes/NodeSampledTexture.js';
import NodeUniformBuffer from '../../common/nodes/NodeUniformBuffer.js';
import NodeStorageBuffer from '../../common/nodes/NodeStorageBuffer.js';
import { NodeBuilder, CodeNode } from '../../../nodes/Nodes.js';
import { getFormat } from '../utils/WebGPUTextureUtils.js';
import WGSLNodeParser from './WGSLNodeParser.js';
import { GPUBufferBindingType, GPUStorageTextureAccess } from '../utils/WebGPUConstants.js';
import VarNode from '../../../nodes/core/VarNode.js';
import ExpressionNode from '../../../nodes/code/ExpressionNode.js';
import { NoColorSpace, FloatType, RepeatWrapping, ClampToEdgeWrapping, MirroredRepeatWrapping, NearestFilter } from '../../../constants.js';
// GPUShaderStage is not defined in browsers not supporting WebGPU
const GPUShaderStage = self.GPUShaderStage;
const wrapNames = {
[ RepeatWrapping ]: 'repeat',
[ ClampToEdgeWrapping ]: 'clamp',
[ MirroredRepeatWrapping ]: 'mirror'
};
const gpuShaderStageLib = {
'vertex': GPUShaderStage ? GPUShaderStage.VERTEX : 1,
'fragment': GPUShaderStage ? GPUShaderStage.FRAGMENT : 2,
'compute': GPUShaderStage ? GPUShaderStage.COMPUTE : 4
};
const supports = {
instance: true,
swizzleAssign: false,
storageBuffer: true
};
const wgslFnOpLib = {
'^^': 'tsl_xor'
};
const wgslTypeLib = {
float: 'f32',
int: 'i32',
uint: 'u32',
bool: 'bool',
color: 'vec3<f32>',
vec2: 'vec2<f32>',
ivec2: 'vec2<i32>',
uvec2: 'vec2<u32>',
bvec2: 'vec2<bool>',
vec3: 'vec3<f32>',
ivec3: 'vec3<i32>',
uvec3: 'vec3<u32>',
bvec3: 'vec3<bool>',
vec4: 'vec4<f32>',
ivec4: 'vec4<i32>',
uvec4: 'vec4<u32>',
bvec4: 'vec4<bool>',
mat2: 'mat2x2<f32>',
mat3: 'mat3x3<f32>',
mat4: 'mat4x4<f32>'
};
const wgslCodeCache = {};
const wgslPolyfill = {
tsl_xor: new CodeNode( 'fn tsl_xor( a : bool, b : bool ) -> bool { return ( a || b ) && !( a && b ); }' ),
mod_float: new CodeNode( 'fn tsl_mod_float( x : f32, y : f32 ) -> f32 { return x - y * floor( x / y ); }' ),
mod_vec2: new CodeNode( 'fn tsl_mod_vec2( x : vec2f, y : vec2f ) -> vec2f { return x - y * floor( x / y ); }' ),
mod_vec3: new CodeNode( 'fn tsl_mod_vec3( x : vec3f, y : vec3f ) -> vec3f { return x - y * floor( x / y ); }' ),
mod_vec4: new CodeNode( 'fn tsl_mod_vec4( x : vec4f, y : vec4f ) -> vec4f { return x - y * floor( x / y ); }' ),
equals_bool: new CodeNode( 'fn tsl_equals_bool( a : bool, b : bool ) -> bool { return a == b; }' ),
equals_bvec2: new CodeNode( 'fn tsl_equals_bvec2( a : vec2f, b : vec2f ) -> vec2<bool> { return vec2<bool>( a.x == b.x, a.y == b.y ); }' ),
equals_bvec3: new CodeNode( 'fn tsl_equals_bvec3( a : vec3f, b : vec3f ) -> vec3<bool> { return vec3<bool>( a.x == b.x, a.y == b.y, a.z == b.z ); }' ),
equals_bvec4: new CodeNode( 'fn tsl_equals_bvec4( a : vec4f, b : vec4f ) -> vec4<bool> { return vec4<bool>( a.x == b.x, a.y == b.y, a.z == b.z, a.w == b.w ); }' ),
repeatWrapping_float: new CodeNode( 'fn tsl_repeatWrapping_float( coord: f32 ) -> f32 { return fract( coord ); }' ),
mirrorWrapping_float: new CodeNode( 'fn tsl_mirrorWrapping_float( coord: f32 ) -> f32 { let mirrored = fract( coord * 0.5 ) * 2.0; return 1.0 - abs( 1.0 - mirrored ); }' ),
clampWrapping_float: new CodeNode( 'fn tsl_clampWrapping_float( coord: f32 ) -> f32 { return clamp( coord, 0.0, 1.0 ); }' ),
biquadraticTexture: new CodeNode( /* wgsl */`
fn tsl_biquadraticTexture( map : texture_2d<f32>, coord : vec2f, iRes : vec2u, level : u32 ) -> vec4f {
let res = vec2f( iRes );
let uvScaled = coord * res;
let uvWrapping = ( ( uvScaled % res ) + res ) % res;
// https://www.shadertoy.com/view/WtyXRy
let uv = uvWrapping - 0.5;
let iuv = floor( uv );
let f = fract( uv );
let rg1 = textureLoad( map, vec2u( iuv + vec2( 0.5, 0.5 ) ) % iRes, level );
let rg2 = textureLoad( map, vec2u( iuv + vec2( 1.5, 0.5 ) ) % iRes, level );
let rg3 = textureLoad( map, vec2u( iuv + vec2( 0.5, 1.5 ) ) % iRes, level );
let rg4 = textureLoad( map, vec2u( iuv + vec2( 1.5, 1.5 ) ) % iRes, level );
return mix( mix( rg1, rg2, f.x ), mix( rg3, rg4, f.x ), f.y );
}
` )
};
const wgslMethods = {
dFdx: 'dpdx',
dFdy: '- dpdy',
mod_float: 'tsl_mod_float',
mod_vec2: 'tsl_mod_vec2',
mod_vec3: 'tsl_mod_vec3',
mod_vec4: 'tsl_mod_vec4',
equals_bool: 'tsl_equals_bool',
equals_bvec2: 'tsl_equals_bvec2',
equals_bvec3: 'tsl_equals_bvec3',
equals_bvec4: 'tsl_equals_bvec4',
inversesqrt: 'inverseSqrt',
bitcast: 'bitcast<f32>'
};
// WebGPU issue: does not support pow() with negative base on Windows
if ( /Windows/g.test( navigator.userAgent ) ) {
wgslPolyfill.pow_float = new CodeNode( 'fn tsl_pow_float( a : f32, b : f32 ) -> f32 { return select( -pow( -a, b ), pow( a, b ), a > 0.0 ); }' );
wgslPolyfill.pow_vec2 = new CodeNode( 'fn tsl_pow_vec2( a : vec2f, b : vec2f ) -> vec2f { return vec2f( tsl_pow_float( a.x, b.x ), tsl_pow_float( a.y, b.y ) ); }', [ wgslPolyfill.pow_float ] );
wgslPolyfill.pow_vec3 = new CodeNode( 'fn tsl_pow_vec3( a : vec3f, b : vec3f ) -> vec3f { return vec3f( tsl_pow_float( a.x, b.x ), tsl_pow_float( a.y, b.y ), tsl_pow_float( a.z, b.z ) ); }', [ wgslPolyfill.pow_float ] );
wgslPolyfill.pow_vec4 = new CodeNode( 'fn tsl_pow_vec4( a : vec4f, b : vec4f ) -> vec4f { return vec4f( tsl_pow_float( a.x, b.x ), tsl_pow_float( a.y, b.y ), tsl_pow_float( a.z, b.z ), tsl_pow_float( a.w, b.w ) ); }', [ wgslPolyfill.pow_float ] );
wgslMethods.pow_float = 'tsl_pow_float';
wgslMethods.pow_vec2 = 'tsl_pow_vec2';
wgslMethods.pow_vec3 = 'tsl_pow_vec3';
wgslMethods.pow_vec4 = 'tsl_pow_vec4';
}
//
let diagnostics = '';
if ( /Firefox|Deno/g.test( navigator.userAgent ) !== true ) {
diagnostics += 'diagnostic( off, derivative_uniformity );\n';
}
//
class WGSLNodeBuilder extends NodeBuilder {
constructor( object, renderer ) {
super( object, renderer, new WGSLNodeParser() );
this.uniformGroups = {};
this.builtins = {};
this.directives = {};
this.scopedArrays = new Map();
}
needsToWorkingColorSpace( texture ) {
return texture.isVideoTexture === true && texture.colorSpace !== NoColorSpace;
}
_generateTextureSample( texture, textureProperty, uvSnippet, depthSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' ) {
if ( depthSnippet ) {
return `textureSample( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ depthSnippet } )`;
} else {
return `textureSample( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet } )`;
}
} else if ( this.isFilteredTexture( texture ) ) {
return this.generateFilteredTexture( texture, textureProperty, uvSnippet );
} else {
return this.generateTextureLod( texture, textureProperty, uvSnippet, depthSnippet, '0' );
}
}
_generateVideoSample( textureProperty, uvSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' ) {
return `textureSampleBaseClampToEdge( ${ textureProperty }, ${ textureProperty }_sampler, vec2<f32>( ${ uvSnippet }.x, 1.0 - ${ uvSnippet }.y ) )`;
} else {
console.error( `WebGPURenderer: THREE.VideoTexture does not support ${ shaderStage } shader.` );
}
}
_generateTextureSampleLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' && this.isUnfilterable( texture ) === false ) {
return `textureSampleLevel( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ levelSnippet } )`;
} else if ( this.isFilteredTexture( texture ) ) {
return this.generateFilteredTexture( texture, textureProperty, uvSnippet, levelSnippet );
} else {
return this.generateTextureLod( texture, textureProperty, uvSnippet, depthSnippet, levelSnippet );
}
}
generateWrapFunction( texture ) {
const functionName = `tsl_coord_${ wrapNames[ texture.wrapS ] }S_${ wrapNames[ texture.wrapT ] }T`;
let nodeCode = wgslCodeCache[ functionName ];
if ( nodeCode === undefined ) {
const includes = [];
let code = `fn ${ functionName }( coord : vec2f ) -> vec2f {\n\n\treturn vec2f(\n`;
const addWrapSnippet = ( wrap, axis ) => {
if ( wrap === RepeatWrapping ) {
includes.push( wgslPolyfill.repeatWrapping_float );
code += `\t\ttsl_repeatWrapping_float( coord.${ axis } )`;
} else if ( wrap === ClampToEdgeWrapping ) {
includes.push( wgslPolyfill.clampWrapping_float );
code += `\t\ttsl_clampWrapping_float( coord.${ axis } )`;
} else if ( wrap === MirroredRepeatWrapping ) {
includes.push( wgslPolyfill.mirrorWrapping_float );
code += `\t\ttsl_mirrorWrapping_float( coord.${ axis } )`;
} else {
code += `\t\tcoord.${ axis }`;
console.warn( `WebGPURenderer: Unsupported texture wrap type "${ wrap }" for vertex shader.` );
}
};
addWrapSnippet( texture.wrapS, 'x' );
code += ',\n';
addWrapSnippet( texture.wrapT, 'y' );
code += '\n\t);\n\n}\n';
wgslCodeCache[ functionName ] = nodeCode = new CodeNode( code, includes );
}
nodeCode.build( this );
return functionName;
}
generateTextureDimension( texture, textureProperty, levelSnippet ) {
const textureData = this.getDataFromNode( texture, this.shaderStage, this.globalCache );
if ( textureData.dimensionsSnippet === undefined ) textureData.dimensionsSnippet = {};
let textureDimensionNode = textureData.dimensionsSnippet[ levelSnippet ];
if ( textureData.dimensionsSnippet[ levelSnippet ] === undefined ) {
let textureDimensionsParams;
if ( texture.isMultisampleRenderTargetTexture === true ) {
textureDimensionsParams = textureProperty;
} else {
textureDimensionsParams = `${ textureProperty }, u32( ${ levelSnippet } )`;
}
textureDimensionNode = new VarNode( new ExpressionNode( `textureDimensions( ${ textureDimensionsParams } )`, 'uvec2' ) );
textureData.dimensionsSnippet[ levelSnippet ] = textureDimensionNode;
}
return textureDimensionNode.build( this );
}
generateFilteredTexture( texture, textureProperty, uvSnippet, levelSnippet = '0u' ) {
this._include( 'biquadraticTexture' );
const wrapFunction = this.generateWrapFunction( texture );
const textureDimension = this.generateTextureDimension( texture, textureProperty, levelSnippet );
return `tsl_biquadraticTexture( ${ textureProperty }, ${ wrapFunction }( ${ uvSnippet } ), ${ textureDimension }, u32( ${ levelSnippet } ) )`;
}
generateTextureLod( texture, textureProperty, uvSnippet, depthSnippet, levelSnippet = '0u' ) {
const wrapFunction = this.generateWrapFunction( texture );
const textureDimension = this.generateTextureDimension( texture, textureProperty, levelSnippet );
const coordSnippet = `vec2u( ${ wrapFunction }( ${ uvSnippet } ) * vec2f( ${ textureDimension } ) )`;
return this.generateTextureLoad( texture, textureProperty, coordSnippet, depthSnippet, levelSnippet );
}
generateTextureLoad( texture, textureProperty, uvIndexSnippet, depthSnippet, levelSnippet = '0u' ) {
if ( depthSnippet ) {
return `textureLoad( ${ textureProperty }, ${ uvIndexSnippet }, ${ depthSnippet }, u32( ${ levelSnippet } ) )`;
} else {
return `textureLoad( ${ textureProperty }, ${ uvIndexSnippet }, u32( ${ levelSnippet } ) )`;
}
}
generateTextureStore( texture, textureProperty, uvIndexSnippet, valueSnippet ) {
return `textureStore( ${ textureProperty }, ${ uvIndexSnippet }, ${ valueSnippet } )`;
}
isSampleCompare( texture ) {
return texture.isDepthTexture === true && texture.compareFunction !== null;
}
isUnfilterable( texture ) {
return this.getComponentTypeFromTexture( texture ) !== 'float' ||
( ! this.isAvailable( 'float32Filterable' ) && texture.isDataTexture === true && texture.type === FloatType ) ||
( this.isSampleCompare( texture ) === false && texture.minFilter === NearestFilter && texture.magFilter === NearestFilter ) ||
texture.isMultisampleRenderTargetTexture === true;
}
generateTexture( texture, textureProperty, uvSnippet, depthSnippet, shaderStage = this.shaderStage ) {
let snippet = null;
if ( texture.isVideoTexture === true ) {
snippet = this._generateVideoSample( textureProperty, uvSnippet, shaderStage );
} else if ( this.isUnfilterable( texture ) ) {
snippet = this.generateTextureLod( texture, textureProperty, uvSnippet, depthSnippet, '0', shaderStage );
} else {
snippet = this._generateTextureSample( texture, textureProperty, uvSnippet, depthSnippet, shaderStage );
}
return snippet;
}
generateTextureGrad( texture, textureProperty, uvSnippet, gradSnippet, depthSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' ) {
// TODO handle i32 or u32 --> uvSnippet, array_index: A, ddx, ddy
return `textureSampleGrad( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ gradSnippet[ 0 ] }, ${ gradSnippet[ 1 ] } )`;
} else {
console.error( `WebGPURenderer: THREE.TextureNode.gradient() does not support ${ shaderStage } shader.` );
}
}
generateTextureCompare( texture, textureProperty, uvSnippet, compareSnippet, depthSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' ) {
return `textureSampleCompare( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ compareSnippet } )`;
} else {
console.error( `WebGPURenderer: THREE.DepthTexture.compareFunction() does not support ${ shaderStage } shader.` );
}
}
generateTextureLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage = this.shaderStage ) {
let snippet = null;
if ( texture.isVideoTexture === true ) {
snippet = this._generateVideoSample( textureProperty, uvSnippet, shaderStage );
} else {
snippet = this._generateTextureSampleLevel( texture, textureProperty, uvSnippet, levelSnippet, depthSnippet, shaderStage );
}
return snippet;
}
generateTextureBias( texture, textureProperty, uvSnippet, biasSnippet, depthSnippet, shaderStage = this.shaderStage ) {
if ( shaderStage === 'fragment' ) {
return `textureSampleBias( ${ textureProperty }, ${ textureProperty }_sampler, ${ uvSnippet }, ${ biasSnippet } )`;
} else {
console.error( `WebGPURenderer: THREE.TextureNode.biasNode does not support ${ shaderStage } shader.` );
}
}
getPropertyName( node, shaderStage = this.shaderStage ) {
if ( node.isNodeVarying === true && node.needsInterpolation === true ) {
if ( shaderStage === 'vertex' ) {
return `varyings.${ node.name }`;
}
} else if ( node.isNodeUniform === true ) {
const name = node.name;
const type = node.type;
if ( type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'texture3D' ) {
return name;
} else if ( type === 'buffer' || type === 'storageBuffer' || type === 'indirectStorageBuffer' ) {
return `NodeBuffer_${ node.id }.${name}`;
} else {
return node.groupNode.name + '.' + name;
}
}
return super.getPropertyName( node );
}
getOutputStructName() {
return 'output';
}
_getUniformGroupCount( shaderStage ) {
return Object.keys( this.uniforms[ shaderStage ] ).length;
}
getFunctionOperator( op ) {
const fnOp = wgslFnOpLib[ op ];
if ( fnOp !== undefined ) {
this._include( fnOp );
return fnOp;
}
return null;
}
getStorageAccess( node ) {
if ( node.isStorageTextureNode ) {
switch ( node.access ) {
case GPUStorageTextureAccess.ReadOnly:
return 'read';
case GPUStorageTextureAccess.WriteOnly:
return 'write';
default:
return 'read_write';
}
} else {
switch ( node.access ) {
case GPUBufferBindingType.Storage:
return 'read_write';
case GPUBufferBindingType.ReadOnlyStorage:
return 'read';
default:
return 'write';
}
}
}
getUniformFromNode( node, type, shaderStage, name = null ) {
const uniformNode = super.getUniformFromNode( node, type, shaderStage, name );
const nodeData = this.getDataFromNode( node, shaderStage, this.globalCache );
if ( nodeData.uniformGPU === undefined ) {
let uniformGPU;
const group = node.groupNode;
const groupName = group.name;
const bindings = this.getBindGroupArray( groupName, shaderStage );
if ( type === 'texture' || type === 'cubeTexture' || type === 'storageTexture' || type === 'texture3D' ) {
let texture = null;
if ( type === 'texture' || type === 'storageTexture' ) {
texture = new NodeSampledTexture( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );
} else if ( type === 'cubeTexture' ) {
texture = new NodeSampledCubeTexture( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );
} else if ( type === 'texture3D' ) {
texture = new NodeSampledTexture3D( uniformNode.name, uniformNode.node, group, node.access ? node.access : null );
}
texture.store = node.isStorageTextureNode === true;
texture.setVisibility( gpuShaderStageLib[ shaderStage ] );
if ( shaderStage === 'fragment' && this.isUnfilterable( node.value ) === false && texture.store === false ) {
const sampler = new NodeSampler( `${uniformNode.name}_sampler`, uniformNode.node, group );
sampler.setVisibility( gpuShaderStageLib[ shaderStage ] );
bindings.push( sampler, texture );
uniformGPU = [ sampler, texture ];
} else {
bindings.push( texture );
uniformGPU = [ texture ];
}
} else if ( type === 'buffer' || type === 'storageBuffer' || type === 'indirectStorageBuffer' ) {
const bufferClass = type === 'buffer' ? NodeUniformBuffer : NodeStorageBuffer;
const buffer = new bufferClass( node, group );
buffer.setVisibility( gpuShaderStageLib[ shaderStage ] );
bindings.push( buffer );
uniformGPU = buffer;
} else {
const uniformsStage = this.uniformGroups[ shaderStage ] || ( this.uniformGroups[ shaderStage ] = {} );
let uniformsGroup = uniformsStage[ groupName ];
if ( uniformsGroup === undefined ) {
uniformsGroup = new NodeUniformsGroup( groupName, group );
uniformsGroup.setVisibility( gpuShaderStageLib[ shaderStage ] );
uniformsStage[ groupName ] = uniformsGroup;
bindings.push( uniformsGroup );
}
uniformGPU = this.getNodeUniform( uniformNode, type );
uniformsGroup.addUniform( uniformGPU );
}
nodeData.uniformGPU = uniformGPU;
}
return uniformNode;
}
getBuiltin( name, property, type, shaderStage = this.shaderStage ) {
const map = this.builtins[ shaderStage ] || ( this.builtins[ shaderStage ] = new Map() );
if ( map.has( name ) === false ) {
map.set( name, {
name,
property,
type
} );
}
return property;
}
hasBuiltin( name, shaderStage = this.shaderStage ) {
return ( this.builtins[ shaderStage ] !== undefined && this.builtins[ shaderStage ].has( name ) );
}
getVertexIndex() {
if ( this.shaderStage === 'vertex' ) {
return this.getBuiltin( 'vertex_index', 'vertexIndex', 'u32', 'attribute' );
}
return 'vertexIndex';
}
buildFunctionCode( shaderNode ) {
const layout = shaderNode.layout;
const flowData = this.flowShaderNode( shaderNode );
const parameters = [];
for ( const input of layout.inputs ) {
parameters.push( input.name + ' : ' + this.getType( input.type ) );
}
//
let code = `fn ${ layout.name }( ${ parameters.join( ', ' ) } ) -> ${ this.getType( layout.type ) } {
${ flowData.vars }
${ flowData.code }
`;
if ( flowData.result ) {
code += `\treturn ${ flowData.result };\n`;
}
code += '\n}\n';
//
return code;
}
getInstanceIndex() {
if ( this.shaderStage === 'vertex' ) {
return this.getBuiltin( 'instance_index', 'instanceIndex', 'u32', 'attribute' );
}
return 'instanceIndex';
}
getInvocationLocalIndex() {
return this.getBuiltin( 'local_invocation_index', 'invocationLocalIndex', 'u32', 'attribute' );
}
getSubgroupSize() {
this.enableSubGroups();
return this.getBuiltin( 'subgroup_size', 'subgroupSize', 'u32', 'attribute' );
}
getInvocationSubgroupIndex() {
this.enableSubGroups();
return this.getBuiltin( 'subgroup_invocation_id', 'invocationSubgroupIndex', 'u32', 'attribute' );
}
getSubgroupIndex() {
this.enableSubGroups();
return this.getBuiltin( 'subgroup_id', 'subgroupIndex', 'u32', 'attribute' );
}
getDrawIndex() {
return null;
}
getFrontFacing() {
return this.getBuiltin( 'front_facing', 'isFront', 'bool' );
}
getFragCoord() {
return this.getBuiltin( 'position', 'fragCoord', 'vec4<f32>' ) + '.xy';
}
getFragDepth() {
return 'output.' + this.getBuiltin( 'frag_depth', 'depth', 'f32', 'output' );
}
getClipDistance() {
return 'varyings.hw_clip_distances';
}
isFlipY() {
return false;
}
enableDirective( name, shaderStage = this.shaderStage ) {
const stage = this.directives[ shaderStage ] || ( this.directives[ shaderStage ] = new Set() );
stage.add( name );
}
getDirectives( shaderStage ) {
const snippets = [];
const directives = this.directives[ shaderStage ];
if ( directives !== undefined ) {
for ( const directive of directives ) {
snippets.push( `enable ${directive};` );
}
}
return snippets.join( '\n' );
}
enableSubGroups() {
this.enableDirective( 'subgroups' );
}
enableSubgroupsF16() {
this.enableDirective( 'subgroups-f16' );
}
enableClipDistances() {
this.enableDirective( 'clip_distances' );
}
enableShaderF16() {
this.enableDirective( 'f16' );
}
enableDualSourceBlending() {
this.enableDirective( 'dual_source_blending' );
}
enableHardwareClipping( planeCount ) {
this.enableClipDistances();
this.getBuiltin( 'clip_distances', 'hw_clip_distances', `array<f32, ${ planeCount } >`, 'vertex' );
}
getBuiltins( shaderStage ) {
const snippets = [];
const builtins = this.builtins[ shaderStage ];
if ( builtins !== undefined ) {
for ( const { name, property, type } of builtins.values() ) {
snippets.push( `@builtin( ${name} ) ${property} : ${type}` );
}
}
return snippets.join( ',\n\t' );
}
getScopedArray( name, scope, bufferType, bufferCount ) {
if ( this.scopedArrays.has( name ) === false ) {
this.scopedArrays.set( name, {
name,
scope,
bufferType,
bufferCount
} );
}
return name;
}
getScopedArrays( shaderStage ) {
if ( shaderStage !== 'compute' ) {
return;
}
const snippets = [];
for ( const { name, scope, bufferType, bufferCount } of this.scopedArrays.values() ) {
const type = this.getType( bufferType );
snippets.push( `var<${scope}> ${name}: array< ${type}, ${bufferCount} >;` );
}
return snippets.join( '\n' );
}
getAttributes( shaderStage ) {
const snippets = [];
if ( shaderStage === 'compute' ) {
this.getBuiltin( 'global_invocation_id', 'id', 'vec3<u32>', 'attribute' );
this.getBuiltin( 'workgroup_id', 'workgroupId', 'vec3<u32>', 'attribute' );
this.getBuiltin( 'local_invocation_id', 'localId', 'vec3<u32>', 'attribute' );
this.getBuiltin( 'num_workgroups', 'numWorkgroups', 'vec3<u32>', 'attribute' );
if ( this.renderer.hasFeature( 'subgroups' ) ) {
this.enableDirective( 'subgroups', shaderStage );
this.getBuiltin( 'subgroup_size', 'subgroupSize', 'u32', 'attribute' );
}
}
if ( shaderStage === 'vertex' || shaderStage === 'compute' ) {
const builtins = this.getBuiltins( 'attribute' );
if ( builtins ) snippets.push( builtins );
const attributes = this.getAttributesArray();
for ( let index = 0, length = attributes.length; index < length; index ++ ) {
const attribute = attributes[ index ];
const name = attribute.name;
const type = this.getType( attribute.type );
snippets.push( `@location( ${index} ) ${ name } : ${ type }` );
}
}
return snippets.join( ',\n\t' );
}
getStructMembers( struct ) {
const snippets = [];
const members = struct.getMemberTypes();
for ( let i = 0; i < members.length; i ++ ) {
const member = members[ i ];
snippets.push( `\t@location( ${i} ) m${i} : ${ member }<f32>` );
}
const builtins = this.getBuiltins( 'output' );
if ( builtins ) snippets.push( '\t' + builtins );
return snippets.join( ',\n' );
}