Initial commit

node_modules/three/examples/jsm/renderers/webgl/WebGLBackend.js

@@ -0,0 +1,943 @@
+import { WebGLCoordinateSystem } from 'three';
+
+import GLSLNodeBuilder from './nodes/GLSLNodeBuilder.js';
+import Backend from '../common/Backend.js';
+
+import WebGLAttributeUtils from './utils/WebGLAttributeUtils.js';
+import WebGLState from './utils/WebGLState.js';
+import WebGLUtils from './utils/WebGLUtils.js';
+import WebGLTextureUtils from './utils/WebGLTextureUtils.js';
+import WebGLExtensions from './utils/WebGLExtensions.js';
+
+//
+
+class WebGLBackend extends Backend {
+
+	constructor( parameters = {} ) {
+
+		super( parameters );
+
+		this.isWebGLBackend = true;
+
+	}
+
+	async init( renderer ) {
+
+		await super.init( renderer );
+
+		//
+
+		const parameters = this.parameters;
+
+		const glContext = ( parameters.context !== undefined ) ? parameters.context : renderer.domElement.getContext( 'webgl2' );
+
+		this.gl = glContext;
+
+		this.extensions = new WebGLExtensions( this );
+		this.attributeUtils = new WebGLAttributeUtils( this );
+		this.textureUtils = new WebGLTextureUtils( this );
+		this.state = new WebGLState( this );
+		this.utils = new WebGLUtils( this );
+		this.defaultTextures = {};
+
+		this.extensions.get( 'EXT_color_buffer_float' );
+		this._currentContext = null;
+
+	}
+
+	get coordinateSystem() {
+
+		return WebGLCoordinateSystem;
+
+	}
+
+	beginRender( renderContext ) {
+
+		const { gl } = this;
+		const renderContextData = this.get( renderContext );
+
+		//
+
+		renderContextData.previousContext = this._currentContext;
+		this._currentContext = renderContext;
+
+		this._setFramebuffer( renderContext );
+
+		this.clear( renderContext, renderContext.clearColor, renderContext.clearDepth, renderContext.clearStencil );
+
+		//
+
+		if ( renderContext.viewport ) {
+
+			this.updateViewport( renderContext );
+
+		} else {
+
+			gl.viewport( 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight );
+
+		}
+
+		const occlusionQueryCount = renderContext.occlusionQueryCount;
+
+		if ( occlusionQueryCount > 0 ) {
+
+			// Get a reference to the array of objects with queries. The renderContextData property
+			// can be changed by another render pass before the async reading of all previous queries complete
+			renderContextData.currentOcclusionQueries = renderContextData.occlusionQueries;
+			renderContextData.currentOcclusionQueryObjects = renderContextData.occlusionQueryObjects;
+
+			renderContextData.lastOcclusionObject = null;
+			renderContextData.occlusionQueries = new Array( occlusionQueryCount );
+			renderContextData.occlusionQueryObjects = new Array( occlusionQueryCount );
+			renderContextData.occlusionQueryIndex = 0;
+
+		}
+
+	}
+
+	finishRender( renderContext ) {
+
+		const renderContextData = this.get( renderContext );
+		const previousContext = renderContextData.previousContext;
+
+		this._currentContext = previousContext;
+
+		if ( previousContext !== null ) {
+
+			this._setFramebuffer( previousContext );
+
+			if ( previousContext.viewport ) {
+
+				this.updateViewport( previousContext );
+
+			} else {
+
+				const gl = this.gl;
+
+				gl.viewport( 0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight );
+
+			}
+
+		}
+
+		const occlusionQueryCount = renderContext.occlusionQueryCount;
+
+		if ( occlusionQueryCount > 0 ) {
+
+			const renderContextData = this.get( renderContext );
+
+			if ( occlusionQueryCount > renderContextData.occlusionQueryIndex ) {
+
+				const { gl } = this;
+
+				gl.endQuery( gl.ANY_SAMPLES_PASSED );
+
+			}
+
+			this.resolveOccludedAsync( renderContext );
+
+		}
+
+	}
+
+	resolveOccludedAsync( renderContext ) {
+
+		const renderContextData = this.get( renderContext );
+
+		// handle occlusion query results
+
+		const { currentOcclusionQueries, currentOcclusionQueryObjects } = renderContextData;
+
+		if ( currentOcclusionQueries && currentOcclusionQueryObjects ) {
+
+			const occluded = new WeakSet();
+			const { gl } = this;
+
+			renderContextData.currentOcclusionQueryObjects = null;
+			renderContextData.currentOcclusionQueries = null;
+
+			const check = () => {
+
+				let completed = 0;
+
+				// check all queries and requeue as appropriate
+				for ( let i = 0; i < currentOcclusionQueries.length; i ++ ) {
+
+					const query = currentOcclusionQueries[ i ];
+
+					if ( query === null ) continue;
+
+					if ( gl.getQueryParameter( query, gl.QUERY_RESULT_AVAILABLE ) ) {
+
+						if ( gl.getQueryParameter( query, gl.QUERY_RESULT ) > 0 ) occluded.add( currentOcclusionQueryObjects[ i ] );
+
+						currentOcclusionQueries[ i ] = null;
+						gl.deleteQuery( query );
+
+						completed ++;
+
+					}
+
+				}
+
+				if ( completed < currentOcclusionQueries.length ) {
+
+					requestAnimationFrame( check );
+
+				} else {
+
+					renderContextData.occluded = occluded;
+
+				}
+
+			}
+
+			check();
+
+		}
+
+	}
+
+	isOccluded( renderContext, object ) {
+
+		const renderContextData = this.get( renderContext );
+
+		return renderContextData.occluded && renderContextData.occluded.has( object );
+
+	}
+
+	updateViewport( renderContext ) {
+
+		const gl = this.gl;
+		const { x, y, width, height } = renderContext.viewportValue;
+
+		gl.viewport( x, y, width, height );
+
+	}
+
+	clear( renderContext, color, depth, stencil ) {
+
+		const { gl } = this;
+
+		//
+
+		let clear = 0;
+
+		if ( color ) clear |= gl.COLOR_BUFFER_BIT;
+		if ( depth ) clear |= gl.DEPTH_BUFFER_BIT;
+		if ( stencil ) clear |= gl.STENCIL_BUFFER_BIT;
+
+		if ( clear !== 0 ) {
+
+			const clearColor = renderContext.clearColorValue;
+
+			if ( depth ) this.state.setDepthMask( true );
+
+			if ( renderContext.textures === null ) {
+
+				gl.clearColor( clearColor.r, clearColor.g, clearColor.b, clearColor.a );
+				gl.clear( clear );
+
+			} else {
+
+				if ( color ) {
+
+					for ( let i = 0; i < renderContext.textures.length; i ++ ) {
+
+						gl.clearBufferfv( gl.COLOR, i, [ clearColor.r, clearColor.g, clearColor.b, clearColor.a ] );
+
+					}
+				}
+
+				if ( depth && stencil ) {
+
+					gl.clearBufferfi( gl.DEPTH_STENCIL, 0, 1, 0 );
+
+				} else if ( depth ) {
+
+					gl.clearBufferfv( gl.DEPTH, 0, [ 1.0 ] );
+
+				} else if ( stencil ) {
+
+					gl.clearBufferiv( gl.STENCIL, 0, [ 0 ] );
+				}
+
+			}
+
+		}
+
+	}
+
+	beginCompute( /*computeGroup*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	compute( /*computeGroup, computeNode, bindings, pipeline*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	finishCompute( /*computeGroup*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	draw( renderObject, info ) {
+
+		const { pipeline, material, context } = renderObject;
+		const { programGPU, vaoGPU } = this.get( pipeline );
+
+		const { gl, state } = this;
+
+		const contextData = this.get( context );
+
+		//
+
+		const bindings = renderObject.getBindings();
+
+		for ( const binding of bindings ) {
+
+			const bindingData = this.get( binding );
+			const index = bindingData.index;
+
+			if ( binding.isUniformsGroup || binding.isUniformBuffer ) {
+
+				gl.bindBufferBase( gl.UNIFORM_BUFFER, index, bindingData.bufferGPU );
+
+			} else if ( binding.isSampledTexture ) {
+
+				gl.activeTexture( gl.TEXTURE0 + index );
+				gl.bindTexture( bindingData.glTextureType, bindingData.textureGPU );
+
+			}
+
+		}
+
+		state.setMaterial( material );
+
+		gl.useProgram( programGPU );
+		gl.bindVertexArray( vaoGPU );
+
+		//
+
+		const index = renderObject.getIndex();
+
+		const object = renderObject.object;
+		const geometry = renderObject.geometry;
+		const drawRange = geometry.drawRange;
+		const firstVertex = drawRange.start;
+
+		//
+
+		const lastObject = contextData.lastOcclusionObject;
+
+		if ( lastObject !== object && lastObject !== undefined ) {
+
+			if ( lastObject !== null && lastObject.occlusionTest === true ) {
+
+				gl.endQuery( gl.ANY_SAMPLES_PASSED );
+
+				contextData.occlusionQueryIndex ++;
+
+			}
+
+			if ( object.occlusionTest === true ) {
+
+				const query = gl.createQuery();
+
+				gl.beginQuery( gl.ANY_SAMPLES_PASSED, query );
+
+				contextData.occlusionQueries[ contextData.occlusionQueryIndex ] = query;
+				contextData.occlusionQueryObjects[ contextData.occlusionQueryIndex ] = object;
+
+			}
+
+			contextData.lastOcclusionObject = object;
+
+		}
+
+		//
+
+		let mode;
+		if ( object.isPoints ) mode = gl.POINTS;
+		else if ( object.isLineSegments ) mode = gl.LINES;
+		else if ( object.isLine ) mode = gl.LINE_STRIP;
+		else if ( object.isLineLoop ) mode = gl.LINE_LOOP;
+		else mode = gl.TRIANGLES;
+
+		//
+
+		const instanceCount = this.getInstanceCount( renderObject );
+
+		if ( index !== null ) {
+
+			const indexData = this.get( index );
+			const indexCount = ( drawRange.count !== Infinity ) ? drawRange.count : index.count;
+
+			if ( instanceCount > 1 ) {
+
+				gl.drawElementsInstanced( mode, index.count, indexData.type, firstVertex, instanceCount );
+
+			} else {
+
+				gl.drawElements( mode, index.count, indexData.type, firstVertex );
+
+			}
+
+
+			info.update( object, indexCount, 1 );
+
+		} else {
+
+			const positionAttribute = geometry.attributes.position;
+			const vertexCount = ( drawRange.count !== Infinity ) ? drawRange.count : positionAttribute.count;
+
+			if ( instanceCount > 1 ) {
+
+				gl.drawArraysInstanced( mode, 0, vertexCount, instanceCount );
+
+			} else {
+
+				gl.drawArrays( mode, 0, vertexCount );
+
+			}
+
+			//gl.drawArrays( mode, vertexCount, gl.UNSIGNED_SHORT, firstVertex );
+
+			info.update( object, vertexCount, 1 );
+
+		}
+
+
+
+		//
+
+		gl.bindVertexArray( null );
+
+	}
+
+	needsUpdate( renderObject ) {
+
+		return false;
+
+	}
+
+	getCacheKey( renderObject ) {
+
+		return renderObject.geometry.id;
+
+	}
+
+	// textures
+
+	createSampler( /*texture*/ ) {
+
+		//console.warn( 'Abstract class.' );
+
+	}
+
+	destroySampler( /*texture*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	createDefaultTexture( texture ) {
+
+		const { gl, textureUtils, defaultTextures } = this;
+
+		const glTextureType = textureUtils.getGLTextureType( texture );
+
+		let textureGPU = defaultTextures[ glTextureType ];
+
+		if ( textureGPU === undefined ) {
+
+			textureGPU = gl.createTexture();
+
+			gl.bindTexture( glTextureType, textureGPU );
+			gl.texParameteri( glTextureType, gl.TEXTURE_MIN_FILTER, gl.NEAREST );
+			gl.texParameteri( glTextureType, gl.TEXTURE_MAG_FILTER, gl.NEAREST );
+
+			//gl.texImage2D( target + i, 0, gl.RGBA, 1, 1, 0, gl.RGBA, gl.UNSIGNED_BYTE, data );
+
+			defaultTextures[ glTextureType ] = textureGPU;
+
+		}
+
+		this.set( texture, {
+			textureGPU,
+			glTextureType,
+			isDefault: true
+		} );
+
+	}
+
+	createTexture( texture, options ) {
+
+		const { gl, utils, textureUtils } = this;
+		const { levels, width, height } = options;
+
+		const glFormat = utils.convert( texture.format, texture.colorSpace );
+		const glType = utils.convert( texture.type );
+		const glInternalFormat = textureUtils.getInternalFormat( texture.internalFormat, glFormat, glType, texture.colorSpace, texture.isVideoTexture );
+
+		const textureGPU = gl.createTexture();
+		const glTextureType = textureUtils.getGLTextureType( texture );
+
+		gl.bindTexture( glTextureType, textureGPU );
+
+		gl.pixelStorei( gl.UNPACK_FLIP_Y_WEBGL, texture.flipY );
+		gl.pixelStorei( gl.UNPACK_PREMULTIPLY_ALPHA_WEBGL, texture.premultiplyAlpha );
+		gl.pixelStorei( gl.UNPACK_ALIGNMENT, texture.unpackAlignment );
+		gl.pixelStorei( gl.UNPACK_COLORSPACE_CONVERSION_WEBGL, gl.NONE );
+
+		textureUtils.setTextureParameters( glTextureType, texture );
+
+		gl.bindTexture( glTextureType, textureGPU );
+
+		if ( ! texture.isVideoTexture ) {
+
+			gl.texStorage2D( glTextureType, levels, glInternalFormat, width, height );
+
+		}
+
+		this.set( texture, {
+			textureGPU,
+			glTextureType,
+			glFormat,
+			glType,
+			glInternalFormat
+		} );
+
+	}
+
+	updateTexture( texture, options ) {
+
+		const { gl } = this;
+		const { width, height } = options;
+		const { textureGPU, glTextureType, glFormat, glType, glInternalFormat } = this.get( texture );
+
+		const getImage = ( source ) => {
+
+			if ( source.isDataTexture ) {
+
+				return source.image.data;
+
+			} else if ( source instanceof ImageBitmap || source instanceof OffscreenCanvas || source instanceof HTMLImageElement || source instanceof HTMLCanvasElement ) {
+
+				return source;
+
+			}
+
+			return source.data;
+
+		};
+
+		gl.bindTexture( glTextureType, textureGPU );
+
+		if ( texture.isCubeTexture ) {
+
+			const images = options.images;
+
+			for ( let i = 0; i < 6; i ++ ) {
+
+				const image = getImage( images[ i ] );
+
+				gl.texSubImage2D( gl.TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, 0, 0, width, height, glFormat, glType, image );
+
+			}
+
+		} else if ( texture.isVideoTexture ) {
+
+			texture.update();
+
+			gl.texImage2D( glTextureType, 0, glInternalFormat, glFormat, glType, options.image );
+
+
+		} else {
+
+			const image = getImage( options.image );
+
+			gl.texSubImage2D( glTextureType, 0, 0, 0, width, height, glFormat, glType, image );
+
+		}
+
+	}
+
+	generateMipmaps( texture ) {
+
+		const { gl } = this;
+		const { textureGPU, glTextureType } = this.get( texture );
+
+		gl.bindTexture( glTextureType, textureGPU );
+		gl.generateMipmap( glTextureType );
+
+	}
+
+	destroyTexture( /*texture*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	copyTextureToBuffer( /*texture, x, y, width, height*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	// node builder
+
+	createNodeBuilder( object, renderer, scene = null ) {
+
+		return new GLSLNodeBuilder( object, renderer, scene );
+
+	}
+
+	// program
+
+	createProgram( program ) {
+
+		const gl = this.gl;
+		const { stage, code } = program;
+
+		const shader = stage === 'vertex' ? gl.createShader( gl.VERTEX_SHADER ) : gl.createShader( gl.FRAGMENT_SHADER );
+
+		gl.shaderSource( shader, code );
+		gl.compileShader( shader );
+
+		this.set( program, {
+			shaderGPU: shader
+		} );
+
+	}
+
+	destroyProgram( /*program*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	createRenderPipeline( renderObject ) {
+
+		const gl = this.gl;
+		const pipeline = renderObject.pipeline;
+
+		// Program
+
+		const { fragmentProgram, vertexProgram } = pipeline;
+
+		const programGPU = gl.createProgram();
+
+		const fragmentShader = this.get( fragmentProgram ).shaderGPU;
+		const vertexShader = this.get( vertexProgram ).shaderGPU;
+
+		gl.attachShader( programGPU, fragmentShader );
+		gl.attachShader( programGPU, vertexShader );
+		gl.linkProgram( programGPU );
+
+		if ( gl.getProgramParameter( programGPU, gl.LINK_STATUS ) === false ) {
+
+			console.error( 'THREE.WebGLBackend:', gl.getProgramInfoLog( programGPU ) );
+
+			console.error( 'THREE.WebGLBackend:', gl.getShaderInfoLog( fragmentShader ) );
+			console.error( 'THREE.WebGLBackend:', gl.getShaderInfoLog( vertexShader ) );
+
+		}
+
+		gl.useProgram( programGPU );
+
+		// Bindings
+
+		const bindings = renderObject.getBindings();
+
+		for ( const binding of bindings ) {
+
+			const bindingData = this.get( binding );
+			const index = bindingData.index;
+
+			if ( binding.isUniformsGroup || binding.isUniformBuffer ) {
+
+				const location = gl.getUniformBlockIndex( programGPU, binding.name );
+				gl.uniformBlockBinding( programGPU, location, index );
+
+			} else if ( binding.isSampledTexture ) {
+
+				const location = gl.getUniformLocation( programGPU, binding.name );
+				gl.uniform1i( location, index );
+
+			}
+
+		}
+
+		// VAO
+
+		const vaoGPU = gl.createVertexArray();
+
+		const index = renderObject.getIndex();
+		const attributes = renderObject.getAttributes();
+
+		gl.bindVertexArray( vaoGPU );
+
+		if ( index !== null ) {
+
+			const indexData = this.get( index );
+
+			gl.bindBuffer( gl.ELEMENT_ARRAY_BUFFER, indexData.bufferGPU );
+
+		}
+
+		for ( let i = 0; i < attributes.length; i ++ ) {
+
+			const attribute = attributes[ i ];
+			const attributeData = this.get( attribute );
+
+			gl.bindBuffer( gl.ARRAY_BUFFER, attributeData.bufferGPU );
+			gl.enableVertexAttribArray( i );
+
+			let stride, offset;
+
+			if ( attribute.isInterleavedBufferAttribute === true ) {
+
+				stride = attribute.data.stride * attributeData.bytesPerElement;
+				offset = attribute.offset * attributeData.bytesPerElement;
+
+			} else {
+
+				stride = 0;
+				offset = 0;
+
+			}
+
+			if ( attributeData.isFloat ) {
+
+				gl.vertexAttribPointer( i, attribute.itemSize, attributeData.type, false, stride, offset );
+
+			} else {
+
+				gl.vertexAttribIPointer( i, attribute.itemSize, attributeData.type, stride, offset );
+
+			}
+
+			if ( attribute.isInstancedBufferAttribute && ! attribute.isInterleavedBufferAttribute ) {
+
+				gl.vertexAttribDivisor( i, attribute.meshPerAttribute );
+
+			} else if ( attribute.isInterleavedBufferAttribute && attribute.data.isInstancedInterleavedBuffer ) {
+
+				gl.vertexAttribDivisor( i, attribute.data.meshPerAttribute );
+
+			}
+
+		}
+
+		gl.bindVertexArray( null );
+
+		//
+
+		this.set( pipeline, {
+			programGPU,
+			vaoGPU
+		} );
+
+	}
+
+	createComputePipeline( /*computePipeline, bindings*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	createBindings( bindings ) {
+
+		this.updateBindings( bindings );
+
+	}
+
+	updateBindings( bindings ) {
+
+		const { gl } = this;
+
+		let groupIndex = 0;
+		let textureIndex = 0;
+
+		for ( const binding of bindings ) {
+
+			if ( binding.isUniformsGroup || binding.isUniformBuffer ) {
+
+				const bufferGPU = gl.createBuffer();
+				const data = binding.buffer;
+
+				gl.bindBuffer( gl.UNIFORM_BUFFER, bufferGPU );
+				gl.bufferData( gl.UNIFORM_BUFFER, data, gl.DYNAMIC_DRAW );
+				gl.bindBufferBase( gl.UNIFORM_BUFFER, groupIndex, bufferGPU );
+
+				this.set( binding, {
+					index: groupIndex ++,
+					bufferGPU
+				} );
+
+			} else if ( binding.isSampledTexture ) {
+
+				const { textureGPU, glTextureType } = this.get( binding.texture );
+
+				this.set( binding, {
+					index: textureIndex ++,
+					textureGPU,
+					glTextureType
+				} );
+
+			}
+
+		}
+
+	}
+
+	updateBinding( binding ) {
+
+		const gl = this.gl;
+
+		if ( binding.isUniformsGroup || binding.isUniformBuffer ) {
+
+			const bindingData = this.get( binding );
+			const bufferGPU = bindingData.bufferGPU;
+			const data = binding.buffer;
+
+			gl.bindBuffer( gl.UNIFORM_BUFFER, bufferGPU );
+			gl.bufferData( gl.UNIFORM_BUFFER, data, gl.DYNAMIC_DRAW );
+
+		}
+
+	}
+
+	// attributes
+
+	createIndexAttribute( attribute ) {
+
+		const gl = this.gl;
+
+		this.attributeUtils.createAttribute( attribute, gl.ELEMENT_ARRAY_BUFFER );
+
+	}
+
+	createAttribute( attribute ) {
+
+		const gl = this.gl;
+
+		this.attributeUtils.createAttribute( attribute, gl.ARRAY_BUFFER );
+
+	}
+
+	createStorageAttribute( /*attribute*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	updateAttribute( attribute ) {
+
+		this.attributeUtils.updateAttribute( attribute );
+
+	}
+
+	destroyAttribute( /*attribute*/ ) {
+
+		console.warn( 'Abstract class.' );
+
+	}
+
+	updateSize() {
+
+		//console.warn( 'Abstract class.' );
+
+	}
+
+	hasFeature( name ) {
+
+		return true;
+
+	}
+
+	copyFramebufferToTexture( texture /*, renderContext */ ) {
+
+		const { gl } = this;
+
+		const { textureGPU } = this.get( texture );
+
+		gl.bindFramebuffer( gl.FRAMEBUFFER, null );
+		gl.bindTexture( gl.TEXTURE_2D, textureGPU );
+
+		gl.copyTexSubImage2D( gl.TEXTURE_2D, 0, 0, 0, 0, 0, texture.image.width, texture.image.height );
+
+		if ( texture.generateMipmaps ) gl.generateMipmap( gl.TEXTURE_2D );
+
+		gl.bindTexture( gl.TEXTURE_2D, null );
+
+	}
+
+	_setFramebuffer( renderContext ) {
+
+		const { gl } = this;
+
+		if ( renderContext.textures !== null ) {
+
+			const renderContextData = this.get( renderContext );
+
+			let fb = renderContextData.framebuffer;
+
+			if ( fb === undefined ) {
+
+				fb = gl.createFramebuffer();
+
+				gl.bindFramebuffer( gl.FRAMEBUFFER, fb );
+
+				const textures = renderContext.textures;
+
+				const drawBuffers = [];
+
+				for ( let i = 0; i < textures.length; i++ ) {
+
+					const texture = textures[ i ];
+					const { textureGPU } = this.get( texture );
+
+					const attachment = gl.COLOR_ATTACHMENT0 + i;
+
+					gl.framebufferTexture2D( gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0 + i, gl.TEXTURE_2D, textureGPU, 0 );
+
+					drawBuffers.push( attachment );
+
+				}
+
+				gl.drawBuffers( drawBuffers );
+
+				if ( renderContext.depthTexture !== null ) {
+
+					const { textureGPU } = this.get( renderContext.depthTexture );
+
+					gl.framebufferTexture2D( gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.TEXTURE_2D, textureGPU, 0 );
+
+				}
+
+				renderContextData.framebuffer = fb;
+
+			} else {
+
+				gl.bindFramebuffer( gl.FRAMEBUFFER, fb );
+
+			}
+
+		} else {
+
+			gl.bindFramebuffer( gl.FRAMEBUFFER, null );
+
+		}
+
+	}
+
+}
+
+export default WebGLBackend;

node_modules/three/examples/jsm/renderers/webgl/nodes/GLSLNodeBuilder.js

@@ -0,0 +1,603 @@
+import { MathNode, GLSLNodeParser, NodeBuilder, NodeMaterial, FunctionNode } from '../../../nodes/Nodes.js';
+
+import UniformBuffer from '../../common/UniformBuffer.js';
+import UniformsGroup from '../../common/UniformsGroup.js';
+import { NodeSampledTexture, NodeSampledCubeTexture } from '../../common/nodes/NodeSampledTexture.js';
+
+const glslMethods = {
+	[ MathNode.ATAN2 ]: 'atan',
+	textureDimensions: 'textureSize'
+};
+
+const precisionLib = {
+	low: 'lowp',
+	medium: 'mediump',
+	high: 'highp'
+};
+
+const supports = {
+	instance: true
+};
+
+class GLSLNodeBuilder extends NodeBuilder {
+
+	constructor( object, renderer, scene = null ) {
+
+		super( object, renderer, new GLSLNodeParser(), scene );
+
+		this.uniformsGroup = {};
+
+	}
+
+	getMethod( method ) {
+
+		return glslMethods[ method ] || method;
+
+	}
+
+	getPropertyName( node, shaderStage ) {
+
+		if ( node.isOutputStructVar ) return '';
+
+		return super.getPropertyName( node, shaderStage );
+
+	}
+
+	buildFunctionNode( shaderNode ) {
+
+		const layout = shaderNode.layout;
+		const flowData = this.flowShaderNode( shaderNode );
+
+		const parameters = [];
+
+		for ( const input of layout.inputs ) {
+
+			parameters.push( this.getType( input.type ) + ' ' + input.name );
+
+		}
+
+		//
+
+		const code = `${ this.getType( layout.type ) } ${ layout.name }( ${ parameters.join( ', ' ) } ) {
+
+	${ flowData.vars }
+
+${ flowData.code }
+	return ${ flowData.result };
+
+}`;
+
+		//
+
+		return new FunctionNode( code );
+
+	}
+
+	getTexture( texture, textureProperty, uvSnippet ) {
+
+		if ( texture.isTextureCube ) {
+
+			return `textureCube( ${textureProperty}, ${uvSnippet} )`;
+
+		} else if ( texture.isDepthTexture ) {
+
+			return `texture( ${textureProperty}, ${uvSnippet} ).x`;
+
+		} else {
+
+			return `texture( ${textureProperty}, ${uvSnippet} )`;
+
+		}
+
+	}
+
+	getTextureLevel( texture, textureProperty, uvSnippet, biasSnippet ) {
+
+		return `textureLod( ${textureProperty}, ${uvSnippet}, ${biasSnippet} )`;
+
+	}
+
+	getTextureCompare( texture, textureProperty, uvSnippet, compareSnippet, shaderStage = this.shaderStage ) {
+
+		if ( shaderStage === 'fragment' ) {
+
+			return `texture( ${textureProperty}, vec3( ${uvSnippet}, ${compareSnippet} ) )`;
+
+		} else {
+
+			console.error( `WebGPURenderer: THREE.DepthTexture.compareFunction() does not support ${ shaderStage } shader.` );
+
+		}
+
+	}
+
+	getVars( shaderStage ) {
+
+		const snippets = [];
+
+		const vars = this.vars[ shaderStage ];
+
+		if ( vars !== undefined ) {
+
+			for ( const variable of vars ) {
+
+				if ( variable.isOutputStructVar ) continue;
+
+				snippets.push( `${ this.getVar( variable.type, variable.name ) };` );
+
+			}
+
+		}
+
+		return snippets.join( '\n\t' );
+
+	}
+
+	getUniforms( shaderStage ) {
+
+		const uniforms = this.uniforms[ shaderStage ];
+
+		const bindingSnippets = [];
+		const groupSnippets = [];
+
+		for ( const uniform of uniforms ) {
+
+			let snippet = null;
+			let group = false;
+
+			if ( uniform.type === 'texture' ) {
+
+				if ( uniform.node.value.compareFunction ) {
+
+					snippet = `sampler2DShadow ${uniform.name};`;
+
+				} else {
+
+					snippet = `sampler2D ${uniform.name};`;
+
+				}
+
+			} else if ( uniform.type === 'cubeTexture' ) {
+
+				snippet = `samplerCube ${uniform.name};`;
+
+			} else if ( uniform.type === 'buffer' ) {
+
+				const bufferNode = uniform.node;
+				const bufferType = this.getType( bufferNode.bufferType );
+				const bufferCount = bufferNode.bufferCount;
+
+				const bufferCountSnippet = bufferCount > 0 ? bufferCount : '';
+				snippet = `${bufferNode.name} {\n\t${bufferType} ${uniform.name}[${bufferCountSnippet}];\n};\n`;
+
+			} else {
+
+				const vectorType = this.getVectorType( uniform.type );
+
+				snippet = `${vectorType} ${uniform.name};`;
+
+				group = true;
+
+			}
+
+			const precision = uniform.node.precision;
+
+			if ( precision !== null ) {
+
+				snippet = precisionLib[ precision ] + ' ' + snippet;
+
+			}
+
+			if ( group ) {
+
+				snippet = '\t' + snippet;
+
+				groupSnippets.push( snippet );
+
+			} else {
+
+				snippet = 'uniform ' + snippet;
+
+				bindingSnippets.push( snippet );
+
+			}
+
+		}
+
+		let output = '';
+
+		if ( groupSnippets.length > 0 ) {
+
+			output += this._getGLSLUniformStruct( shaderStage + 'NodeUniforms', groupSnippets.join( '\n' ) ) + '\n';
+
+		}
+
+		output += bindingSnippets.join( '\n' );
+
+		return output;
+
+	}
+
+	getAttributes( shaderStage ) {
+
+		let snippet = '';
+
+		if ( shaderStage === 'vertex' ) {
+
+			const attributes = this.getAttributesArray();
+
+			let location = 0;
+
+			for ( const attribute of attributes ) {
+
+				snippet += `layout( location = ${ location ++ } ) in ${ attribute.type } ${ attribute.name };\n`;
+
+			}
+
+		}
+
+		return snippet;
+
+	}
+
+	getStructMembers( struct ) {
+
+		const snippets = [];
+		const members = struct.getMemberTypes();
+
+		for ( let i = 0; i < members.length; i ++ ) {
+
+			const member = members[ i ];
+			snippets.push( `layout( location = ${i} ) out ${ member} m${i};` );
+
+		}
+
+		return snippets.join( '\n' );
+
+	}
+
+	getStructs( shaderStage ) {
+
+		const snippets = [];
+		const structs = this.structs[ shaderStage ];
+
+		if ( structs.length === 0 ) {
+
+			return 'layout( location = 0 ) out vec4 fragColor;\n';
+
+		}
+
+		for ( let index = 0, length = structs.length; index < length; index ++ ) {
+
+			const struct = structs[ index ];
+
+			let snippet = '\n';
+			snippet += this.getStructMembers( struct );
+			snippet += '\n';
+
+			snippets.push( snippet );
+
+		}
+
+		return snippets.join( '\n\n' );
+
+	}
+
+	getVaryings( shaderStage ) {
+
+		let snippet = '';
+
+		const varyings = this.varyings;
+
+		if ( shaderStage === 'vertex' ) {
+
+			for ( const varying of varyings ) {
+
+				const type = varying.type;
+				const flat = type === 'int' || type === 'uint' ? 'flat ' : '';
+
+				snippet += `${flat}${varying.needsInterpolation ? 'out' : '/*out*/'} ${type} ${varying.name};\n`;
+
+			}
+
+		} else if ( shaderStage === 'fragment' ) {
+
+			for ( const varying of varyings ) {
+
+				if ( varying.needsInterpolation ) {
+
+					const type = varying.type;
+					const flat = type === 'int' || type === 'uint' ? 'flat ' : '';
+
+					snippet += `${flat}in ${type} ${varying.name};\n`;
+
+				}
+
+			}
+
+		}
+
+		return snippet;
+
+	}
+
+	getVertexIndex() {
+
+		return 'gl_VertexID';
+
+	}
+
+	getInstanceIndex() {
+
+		return 'uint( gl_InstanceID )';
+
+	}
+
+	getFrontFacing() {
+
+		return 'gl_FrontFacing';
+
+	}
+
+	getFragCoord() {
+
+		return 'gl_FragCoord';
+
+	}
+
+	isAvailable( name ) {
+
+		return supports[ name ] === true;
+
+	}
+
+
+	isFlipY() {
+
+		return true;
+
+	}
+
+	_getGLSLUniformStruct( name, vars ) {
+
+		return `
+layout( std140 ) uniform ${name} {
+${vars}
+};`;
+
+	}
+
+	_getGLSLVertexCode( shaderData ) {
+
+		return `#version 300 es
+
+${ this.getSignature() }
+
+// precision
+precision highp float;
+precision highp int;
+
+// uniforms
+${shaderData.uniforms}
+
+// varyings
+${shaderData.varyings}
+
+// attributes
+${shaderData.attributes}
+
+// codes
+${shaderData.codes}
+
+void main() {
+
+	// vars
+	${shaderData.vars}
+
+	// flow
+	${shaderData.flow}
+
+	gl_PointSize = 1.0;
+
+}
+`;
+
+	}
+
+	_getGLSLFragmentCode( shaderData ) {
+
+		return `#version 300 es
+
+${ this.getSignature() }
+
+// precision
+precision highp float;
+precision highp int;
+precision lowp sampler2DShadow;
+
+// uniforms
+${shaderData.uniforms}
+
+// varyings
+${shaderData.varyings}
+
+// codes
+${shaderData.codes}
+
+${shaderData.structs}
+
+void main() {
+
+	// vars
+	${shaderData.vars}
+
+	// flow
+	${shaderData.flow}
+
+}
+`;
+
+	}
+
+	buildCode() {
+
+		const shadersData = this.material !== null ? { fragment: {}, vertex: {} } : { compute: {} };
+
+		for ( const shaderStage in shadersData ) {
+
+			let flow = '// code\n\n';
+			flow += this.flowCode[ shaderStage ];
+
+			const flowNodes = this.flowNodes[ shaderStage ];
+			const mainNode = flowNodes[ flowNodes.length - 1 ];
+
+			for ( const node of flowNodes ) {
+
+				const flowSlotData = this.getFlowData( node/*, shaderStage*/ );
+				const slotName = node.name;
+
+				if ( slotName ) {
+
+					if ( flow.length > 0 ) flow += '\n';
+
+					flow += `\t// flow -> ${ slotName }\n\t`;
+
+				}
+
+				flow += `${ flowSlotData.code }\n\t`;
+
+				if ( node === mainNode && shaderStage !== 'compute' ) {
+
+					flow += '// result\n\t';
+
+					if ( shaderStage === 'vertex' ) {
+
+						flow += 'gl_Position = ';
+						flow += `${ flowSlotData.result };`;
+
+					} else if ( shaderStage === 'fragment' ) {
+
+						if ( ! node.outputNode.isOutputStructNode ) {
+
+							flow += 'fragColor = ';
+							flow += `${ flowSlotData.result };`;
+
+						}
+
+					}
+
+				}
+
+			}
+
+			const stageData = shadersData[ shaderStage ];
+
+			stageData.uniforms = this.getUniforms( shaderStage );
+			stageData.attributes = this.getAttributes( shaderStage );
+			stageData.varyings = this.getVaryings( shaderStage );
+			stageData.vars = this.getVars( shaderStage );
+			stageData.structs = this.getStructs( shaderStage );
+			stageData.codes = this.getCodes( shaderStage );
+			stageData.flow = flow;
+
+		}
+
+		if ( this.material !== null ) {
+
+			this.vertexShader = this._getGLSLVertexCode( shadersData.vertex );
+			this.fragmentShader = this._getGLSLFragmentCode( shadersData.fragment );
+
+		} else {
+
+			console.warn( 'GLSLNodeBuilder: compute shaders are not supported.' );
+			//this.computeShader = this._getGLSLComputeCode( shadersData.compute );
+
+		}
+
+	}
+
+	getUniformFromNode( node, type, shaderStage, name = null ) {
+
+		const uniformNode = super.getUniformFromNode( node, type, shaderStage, name );
+		const nodeData = this.getDataFromNode( node, shaderStage );
+
+		let uniformGPU = nodeData.uniformGPU;
+
+		if ( uniformGPU === undefined ) {
+
+			if ( type === 'texture' ) {
+
+				uniformGPU = new NodeSampledTexture( uniformNode.name, uniformNode.node );
+
+				this.bindings[ shaderStage ].push( uniformGPU );
+
+			} else if ( type === 'cubeTexture' ) {
+
+				uniformGPU = new NodeSampledCubeTexture( uniformNode.name, uniformNode.node );
+
+				this.bindings[ shaderStage ].push( uniformGPU );
+
+			} else if ( type === 'buffer' ) {
+
+				node.name = `NodeBuffer_${node.id}`;
+
+				const buffer = new UniformBuffer( node.name, node.value );
+
+				uniformNode.name = `buffer${node.id}`;
+
+				this.bindings[ shaderStage ].push( buffer );
+
+				uniformGPU = buffer;
+
+			} else {
+
+				let uniformsGroup = this.uniformsGroup[ shaderStage ];
+
+				if ( uniformsGroup === undefined ) {
+
+					uniformsGroup = new UniformsGroup( shaderStage + 'NodeUniforms' );
+					//uniformsGroup.setVisibility( gpuShaderStageLib[ shaderStage ] );
+
+					this.uniformsGroup[ shaderStage ] = uniformsGroup;
+
+					this.bindings[ shaderStage ].push( uniformsGroup );
+
+				}
+
+				uniformGPU = this.getNodeUniform( uniformNode, type );
+
+				uniformsGroup.addUniform( uniformGPU );
+
+			}
+
+			nodeData.uniformGPU = uniformGPU;
+
+		}
+
+		return uniformNode;
+
+	}
+
+	build() {
+
+		// @TODO: Move this code to super.build()
+
+		const { object, material } = this;
+
+		if ( material !== null ) {
+
+			NodeMaterial.fromMaterial( material ).build( this );
+
+		} else {
+
+			this.addFlow( 'compute', object );
+
+		}
+
+		return super.build();
+
+	}
+
+}
+
+export default GLSLNodeBuilder;

node_modules/three/examples/jsm/renderers/webgl/utils/WebGLAttributeUtils.js

@@ -0,0 +1,119 @@
+class WebGLAttributeUtils {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+	}
+
+	createAttribute( attribute, bufferType ) {
+
+		const backend = this.backend;
+		const { gl } = backend;
+
+		const array = attribute.array;
+		const usage = attribute.usage || gl.STATIC_DRAW;
+
+		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
+		const bufferData = backend.get( bufferAttribute );
+
+		let bufferGPU = bufferData.bufferGPU;
+
+		if ( bufferGPU === undefined ) {
+
+			bufferGPU = gl.createBuffer();
+
+			gl.bindBuffer( bufferType, bufferGPU );
+			gl.bufferData( bufferType, array, usage );
+			gl.bindBuffer( bufferType, null );
+
+			bufferData.bufferGPU = bufferGPU;
+			bufferData.bufferType = bufferType;
+			bufferData.version = bufferAttribute.version;
+
+		}
+
+		//attribute.onUploadCallback();
+
+		let type;
+		let isFloat = false;
+
+		if ( array instanceof Float32Array ) {
+
+			type = gl.FLOAT;
+			isFloat = true;
+
+		} else if ( array instanceof Uint16Array ) {
+
+			if ( attribute.isFloat16BufferAttribute ) {
+
+				type = gl.HALF_FLOAT;
+				isFloat = true;
+
+			} else {
+
+				type = gl.UNSIGNED_SHORT;
+
+			}
+
+		} else if ( array instanceof Int16Array ) {
+
+			type = gl.SHORT;
+
+		} else if ( array instanceof Uint32Array ) {
+
+			type = gl.UNSIGNED_INT;
+
+		} else if ( array instanceof Int32Array ) {
+
+			type = gl.INT;
+
+		} else if ( array instanceof Int8Array ) {
+
+			type = gl.BYTE;
+
+		} else if ( array instanceof Uint8Array ) {
+
+			type = gl.UNSIGNED_BYTE;
+
+		} else if ( array instanceof Uint8ClampedArray ) {
+
+			type = gl.UNSIGNED_BYTE;
+
+		} else {
+
+			throw new Error( 'THREE.WebGLBackend: Unsupported buffer data format: ' + array );
+
+		}
+
+		backend.set( attribute, {
+			bufferGPU,
+			type,
+			bytesPerElement: array.BYTES_PER_ELEMENT,
+			version: attribute.version,
+			isFloat
+		} );
+
+	}
+
+	updateAttribute( attribute ) {
+
+		const backend = this.backend;
+		const { gl } = backend;
+
+		const array = attribute.array;
+		const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
+		const bufferData = backend.get( bufferAttribute );
+		const bufferType = bufferData.bufferType;
+
+		gl.bindBuffer( bufferType, bufferData.bufferGPU );
+		gl.bufferSubData( bufferType, 0, array );
+		gl.bindBuffer( bufferType, null );
+
+		bufferData.version = bufferAttribute.version;
+
+	}
+
+}
+
+export default WebGLAttributeUtils;

node_modules/three/examples/jsm/renderers/webgl/utils/WebGLExtensions.js

@@ -0,0 +1,26 @@
+class WebGLExtensions {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+		this.gl = this.backend.gl;
+		this.availableExtensions = this.gl.getSupportedExtensions();
+
+	}
+
+	get( name ) {
+
+		return this.gl.getExtension( name );
+
+	}
+
+	has( name ) {
+
+		return this.availableExtensions.includes( name );
+
+	}
+
+}
+
+export default WebGLExtensions;

node_modules/three/examples/jsm/renderers/webgl/utils/WebGLState.js

@@ -0,0 +1,541 @@
+import {
+	CullFaceNone, CullFaceBack, CullFaceFront, DoubleSide, BackSide,
+	NormalBlending, NoBlending, CustomBlending, AddEquation,
+	AdditiveBlending, SubtractiveBlending, MultiplyBlending, SubtractEquation, ReverseSubtractEquation,
+	ZeroFactor, OneFactor, SrcColorFactor, SrcAlphaFactor, SrcAlphaSaturateFactor, DstColorFactor, DstAlphaFactor,
+	OneMinusSrcColorFactor, OneMinusSrcAlphaFactor, OneMinusDstColorFactor, OneMinusDstAlphaFactor,
+	NeverDepth, AlwaysDepth, LessDepth, LessEqualDepth, EqualDepth, GreaterEqualDepth, GreaterDepth, NotEqualDepth
+} from 'three';
+
+let initialized = false, equationToGL, factorToGL;
+
+class WebGLState {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+		this.gl = this.backend.gl;
+
+		this.enabled = {};
+		this.currentFlipSided = null;
+		this.currentCullFace = null;
+		this.currentProgram = null;
+		this.currentBlendingEnabled = false;
+		this.currentBlending = null;
+		this.currentBlendSrc = null;
+		this.currentBlendDst = null;
+		this.currentBlendSrcAlpha = null;
+		this.currentBlendDstAlpha = null;
+		this.currentPremultipledAlpha = null;
+		this.currentPolygonOffsetFactor = null;
+		this.currentPolygonOffsetUnits = null;
+		this.currentColorMask = null;
+		this.currentDepthFunc = null;
+		this.currentDepthMask = null;
+		this.currentStencilFunc = null;
+		this.currentStencilRef = null;
+		this.currentStencilFuncMask = null;
+		this.currentStencilFail = null;
+		this.currentStencilZFail = null;
+		this.currentStencilZPass = null;
+		this.currentStencilMask = null;
+
+		if ( initialized === false ) {
+
+			this._init( this.gl );
+
+			initialized = true;
+
+		}
+
+	}
+
+	_init( gl ) {
+
+		// Store only WebGL constants here.
+
+		equationToGL = {
+			[ AddEquation ]: gl.FUNC_ADD,
+			[ SubtractEquation ]: gl.FUNC_SUBTRACT,
+			[ ReverseSubtractEquation ]: gl.FUNC_REVERSE_SUBTRACT
+		};
+
+		factorToGL = {
+			[ ZeroFactor ]: gl.ZERO,
+			[ OneFactor ]: gl.ONE,
+			[ SrcColorFactor ]: gl.SRC_COLOR,
+			[ SrcAlphaFactor ]: gl.SRC_ALPHA,
+			[ SrcAlphaSaturateFactor ]: gl.SRC_ALPHA_SATURATE,
+			[ DstColorFactor ]: gl.DST_COLOR,
+			[ DstAlphaFactor ]: gl.DST_ALPHA,
+			[ OneMinusSrcColorFactor ]: gl.ONE_MINUS_SRC_COLOR,
+			[ OneMinusSrcAlphaFactor ]: gl.ONE_MINUS_SRC_ALPHA,
+			[ OneMinusDstColorFactor ]: gl.ONE_MINUS_DST_COLOR,
+			[ OneMinusDstAlphaFactor ]: gl.ONE_MINUS_DST_ALPHA
+		};
+
+	}
+
+	enable( id ) {
+
+		const { enabled } = this;
+
+		if ( enabled[ id ] !== true ) {
+
+			this.gl.enable( id );
+			enabled[ id ] = true;
+
+		}
+
+	}
+
+	disable( id ) {
+
+		const { enabled } = this;
+
+		if ( enabled[ id ] !== false ) {
+
+			this.gl.disable( id );
+			enabled[ id ] = false;
+
+		}
+
+	}
+
+	setFlipSided( flipSided ) {
+
+		if ( this.currentFlipSided !== flipSided ) {
+
+			const { gl } = this;
+
+			if ( flipSided ) {
+
+				gl.frontFace( gl.CW );
+
+			} else {
+
+				gl.frontFace( gl.CCW );
+
+			}
+
+			this.currentFlipSided = flipSided;
+
+		}
+
+	}
+
+	setCullFace( cullFace ) {
+
+		const { gl } = this;
+
+		if ( cullFace !== CullFaceNone ) {
+
+			this.enable( gl.CULL_FACE );
+
+			if ( cullFace !== this.currentCullFace ) {
+
+				if ( cullFace === CullFaceBack ) {
+
+					gl.cullFace( gl.BACK );
+
+				} else if ( cullFace === CullFaceFront ) {
+
+					gl.cullFace( gl.FRONT );
+
+				} else {
+
+					gl.cullFace( gl.FRONT_AND_BACK );
+
+				}
+
+			}
+
+		} else {
+
+			this.disable( gl.CULL_FACE );
+
+		}
+
+		this.currentCullFace = cullFace;
+
+	}
+
+	setBlending( blending, blendEquation, blendSrc, blendDst, blendEquationAlpha, blendSrcAlpha, blendDstAlpha, premultipliedAlpha ) {
+
+		const { gl } = this;
+
+		if ( blending === NoBlending ) {
+
+			if ( this.currentBlendingEnabled === true ) {
+
+				this.disable( gl.BLEND );
+				this.currentBlendingEnabled = false;
+
+			}
+
+			return;
+
+		}
+
+		if ( this.currentBlendingEnabled === false ) {
+
+			this.enable( gl.BLEND );
+			this.currentBlendingEnabled = true;
+
+		}
+
+		if ( blending !== CustomBlending ) {
+
+			if ( blending !== this.currentBlending || premultipliedAlpha !== this.currentPremultipledAlpha ) {
+
+				if ( this.currentBlendEquation !== AddEquation || this.currentBlendEquationAlpha !== AddEquation ) {
+
+					gl.blendEquation( gl.FUNC_ADD );
+
+					this.currentBlendEquation = AddEquation;
+					this.currentBlendEquationAlpha = AddEquation;
+
+				}
+
+				if ( premultipliedAlpha ) {
+
+					switch ( blending ) {
+
+						case NormalBlending:
+							gl.blendFuncSeparate( gl.ONE, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
+							break;
+
+						case AdditiveBlending:
+							gl.blendFunc( gl.ONE, gl.ONE );
+							break;
+
+						case SubtractiveBlending:
+							gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
+							break;
+
+						case MultiplyBlending:
+							gl.blendFuncSeparate( gl.ZERO, gl.SRC_COLOR, gl.ZERO, gl.SRC_ALPHA );
+							break;
+
+						default:
+							console.error( 'THREE.WebGLState: Invalid blending: ', blending );
+							break;
+
+					}
+
+				} else {
+
+					switch ( blending ) {
+
+						case NormalBlending:
+							gl.blendFuncSeparate( gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA );
+							break;
+
+						case AdditiveBlending:
+							gl.blendFunc( gl.SRC_ALPHA, gl.ONE );
+							break;
+
+						case SubtractiveBlending:
+							gl.blendFuncSeparate( gl.ZERO, gl.ONE_MINUS_SRC_COLOR, gl.ZERO, gl.ONE );
+							break;
+
+						case MultiplyBlending:
+							gl.blendFunc( gl.ZERO, gl.SRC_COLOR );
+							break;
+
+						default:
+							console.error( 'THREE.WebGLState: Invalid blending: ', blending );
+							break;
+
+					}
+
+				}
+
+				this.currentBlendSrc = null;
+				this.currentBlendDst = null;
+				this.currentBlendSrcAlpha = null;
+				this.currentBlendDstAlpha = null;
+
+				this.currentBlending = blending;
+				this.currentPremultipledAlpha = premultipliedAlpha;
+
+			}
+
+			return;
+
+		}
+
+		// custom blending
+
+		blendEquationAlpha = blendEquationAlpha || blendEquation;
+		blendSrcAlpha = blendSrcAlpha || blendSrc;
+		blendDstAlpha = blendDstAlpha || blendDst;
+
+		if ( blendEquation !== this.currentBlendEquation || blendEquationAlpha !== this.currentBlendEquationAlpha ) {
+
+			gl.blendEquationSeparate( equationToGL[ blendEquation ], equationToGL[ blendEquationAlpha ] );
+
+			this.currentBlendEquation = blendEquation;
+			this.currentBlendEquationAlpha = blendEquationAlpha;
+
+		}
+
+		if ( blendSrc !== this.currentBlendSrc || blendDst !== this.currentBlendDst || blendSrcAlpha !== this.currentBlendSrcAlpha || blendDstAlpha !== this.currentBlendDstAlpha ) {
+
+			gl.blendFuncSeparate( factorToGL[ blendSrc ], factorToGL[ blendDst ], factorToGL[ blendSrcAlpha ], factorToGL[ blendDstAlpha ] );
+
+			this.currentBlendSrc = blendSrc;
+			this.currentBlendDst = blendDst;
+			this.currentBlendSrcAlpha = blendSrcAlpha;
+			this.currentBlendDstAlpha = blendDstAlpha;
+
+		}
+
+		this.currentBlending = blending;
+		this.currentPremultipledAlpha = false;
+
+	}
+
+	setColorMask( colorMask ) {
+
+		if ( this.currentColorMask !== colorMask ) {
+
+			this.gl.colorMask( colorMask, colorMask, colorMask, colorMask );
+			this.currentColorMask = colorMask;
+
+		}
+
+	}
+
+	setDepthTest( depthTest ) {
+
+		const { gl } = this;
+
+		if ( depthTest ) {
+
+			this.enable( gl.DEPTH_TEST );
+
+		} else {
+
+			this.disable( gl.DEPTH_TEST );
+
+		}
+
+	}
+
+	setDepthMask( depthMask ) {
+
+		if ( this.currentDepthMask !== depthMask ) {
+
+			this.gl.depthMask( depthMask );
+			this.currentDepthMask = depthMask;
+
+		}
+
+	}
+
+	setDepthFunc( depthFunc ) {
+
+		if ( this.currentDepthFunc !== depthFunc ) {
+
+			const { gl } = this;
+
+			switch ( depthFunc ) {
+
+				case NeverDepth:
+
+					gl.depthFunc( gl.NEVER );
+					break;
+
+				case AlwaysDepth:
+
+					gl.depthFunc( gl.ALWAYS );
+					break;
+
+				case LessDepth:
+
+					gl.depthFunc( gl.LESS );
+					break;
+
+				case LessEqualDepth:
+
+					gl.depthFunc( gl.LEQUAL );
+					break;
+
+				case EqualDepth:
+
+					gl.depthFunc( gl.EQUAL );
+					break;
+
+				case GreaterEqualDepth:
+
+					gl.depthFunc( gl.GEQUAL );
+					break;
+
+				case GreaterDepth:
+
+					gl.depthFunc( gl.GREATER );
+					break;
+
+				case NotEqualDepth:
+
+					gl.depthFunc( gl.NOTEQUAL );
+					break;
+
+				default:
+
+					gl.depthFunc( gl.LEQUAL );
+
+			}
+
+			this.currentDepthFunc = depthFunc;
+
+		}
+
+	}
+
+	setStencilTest( stencilTest ) {
+
+		const { gl } = this;
+
+		if ( stencilTest ) {
+
+			this.enable( gl.STENCIL_TEST );
+
+		} else {
+
+			this.disable( gl.STENCIL_TEST );
+
+		}
+
+	}
+
+	setStencilMask( stencilMask ) {
+
+		if ( this.currentStencilMask !== stencilMask ) {
+
+			this.gl.stencilMask( stencilMask );
+			this.currentStencilMask = stencilMask;
+
+		}
+
+	}
+
+	setStencilFunc( stencilFunc, stencilRef, stencilMask ) {
+
+		if ( this.currentStencilFunc !== stencilFunc ||
+			 this.currentStencilRef !== stencilRef ||
+			 this.currentStencilFuncMask !== stencilMask ) {
+
+			this.gl.stencilFunc( stencilFunc, stencilRef, stencilMask );
+
+			this.currentStencilFunc = stencilFunc;
+			this.currentStencilRef = stencilRef;
+			this.currentStencilFuncMask = stencilMask;
+
+		}
+
+	}
+
+	setStencilOp( stencilFail, stencilZFail, stencilZPass ) {
+
+		if ( this.currentStencilFail !== stencilFail ||
+			 this.currentStencilZFail !== stencilZFail ||
+			 this.currentStencilZPass !== stencilZPass ) {
+
+			this.gl.stencilOp( stencilFail, stencilZFail, stencilZPass );
+
+			this.currentStencilFail = stencilFail;
+			this.currentStencilZFail = stencilZFail;
+			this.currentStencilZPass = stencilZPass;
+
+		}
+
+	}
+
+	setMaterial( material, frontFaceCW ) {
+
+		const { gl } = this;
+
+		material.side === DoubleSide
+			? this.disable( gl.CULL_FACE )
+			: this.enable( gl.CULL_FACE );
+
+		let flipSided = ( material.side === BackSide );
+		if ( frontFaceCW ) flipSided = ! flipSided;
+
+		this.setFlipSided( flipSided );
+
+		( material.blending === NormalBlending && material.transparent === false )
+			? this.setBlending( NoBlending )
+			: this.setBlending( material.blending, material.blendEquation, material.blendSrc, material.blendDst, material.blendEquationAlpha, material.blendSrcAlpha, material.blendDstAlpha, material.premultipliedAlpha );
+
+		this.setDepthFunc( material.depthFunc );
+		this.setDepthTest( material.depthTest );
+		this.setDepthMask( material.depthWrite );
+		this.setColorMask( material.colorWrite );
+
+		const stencilWrite = material.stencilWrite;
+		this.setStencilTest( stencilWrite );
+		if ( stencilWrite ) {
+
+			this.setStencilMask( material.stencilWriteMask );
+			this.setStencilFunc( material.stencilFunc, material.stencilRef, material.stencilFuncMask );
+			this.setStencilOp( material.stencilFail, material.stencilZFail, material.stencilZPass );
+
+		}
+
+		this.setPolygonOffset( material.polygonOffset, material.polygonOffsetFactor, material.polygonOffsetUnits );
+
+		material.alphaToCoverage === true
+			? this.enable( gl.SAMPLE_ALPHA_TO_COVERAGE )
+			: this.disable( gl.SAMPLE_ALPHA_TO_COVERAGE );
+
+	}
+
+	setPolygonOffset( polygonOffset, factor, units ) {
+
+		const { gl } = this;
+
+		if ( polygonOffset ) {
+
+			this.enable( gl.POLYGON_OFFSET_FILL );
+
+			if ( this.currentPolygonOffsetFactor !== factor || this.currentPolygonOffsetUnits !== units ) {
+
+				gl.polygonOffset( factor, units );
+
+				this.currentPolygonOffsetFactor = factor;
+				this.currentPolygonOffsetUnits = units;
+
+			}
+
+		} else {
+
+			this.disable( gl.POLYGON_OFFSET_FILL );
+
+		}
+
+	}
+
+	useProgram( program ) {
+
+		if ( this.currentProgram !== program ) {
+
+			this.gl.useProgram( program );
+
+			this.currentProgram = program;
+
+			return true;
+
+		}
+
+		return false;
+
+	}
+
+
+}
+
+export default WebGLState;

node_modules/three/examples/jsm/renderers/webgl/utils/WebGLTextureUtils.js

@@ -0,0 +1,212 @@
+import { LinearFilter, LinearMipmapLinearFilter, LinearMipmapNearestFilter, NearestFilter, NearestMipmapLinearFilter, NearestMipmapNearestFilter, RGBAFormat, DepthFormat, DepthStencilFormat, UnsignedShortType, UnsignedIntType, UnsignedInt248Type, FloatType, HalfFloatType, MirroredRepeatWrapping, ClampToEdgeWrapping, RepeatWrapping, UnsignedByteType, _SRGBAFormat, NoColorSpace, LinearSRGBColorSpace, SRGBColorSpace, NeverCompare, AlwaysCompare, LessCompare, LessEqualCompare, EqualCompare, GreaterEqualCompare, GreaterCompare, NotEqualCompare } from 'three';
+
+let initialized = false, wrappingToGL, filterToGL, compareToGL;
+
+class WebGLTextureUtils {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+		this.gl = backend.gl;
+		this.extensions = backend.extensions;
+
+		if ( initialized === false ) {
+
+			this._init( this.gl );
+
+			initialized = true;
+
+		}
+
+	}
+
+	_init( gl ) {
+
+		// Store only WebGL constants here.
+
+		wrappingToGL = {
+			[ RepeatWrapping ]: gl.REPEAT,
+			[ ClampToEdgeWrapping ]: gl.CLAMP_TO_EDGE,
+			[ MirroredRepeatWrapping ]: gl.MIRRORED_REPEAT
+		};
+
+		filterToGL = {
+			[ NearestFilter ]: gl.NEAREST,
+			[ NearestMipmapNearestFilter ]: gl.NEAREST_MIPMAP_NEAREST,
+			[ NearestMipmapLinearFilter ]: gl.NEAREST_MIPMAP_LINEAR,
+
+			[ LinearFilter ]: gl.LINEAR,
+			[ LinearMipmapNearestFilter ]: gl.LINEAR_MIPMAP_NEAREST,
+			[ LinearMipmapLinearFilter ]: gl.LINEAR_MIPMAP_LINEAR
+		};
+
+		compareToGL = {
+			[ NeverCompare ]: gl.NEVER,
+			[ AlwaysCompare ]: gl.ALWAYS,
+			[ LessCompare ]: gl.LESS,
+			[ LessEqualCompare ]: gl.LEQUAL,
+			[ EqualCompare ]: gl.EQUAL,
+			[ GreaterEqualCompare ]: gl.GEQUAL,
+			[ GreaterCompare ]: gl.GREATER,
+			[ NotEqualCompare ]: gl.NOTEQUAL
+		};
+
+	}
+
+	filterFallback( f ) {
+
+		const { gl } = this;
+
+		if ( f === NearestFilter || f === NearestMipmapNearestFilter || f === NearestMipmapLinearFilter ) {
+
+			return gl.NEAREST;
+
+		}
+
+		return gl.LINEAR;
+
+	}
+
+	getGLTextureType( texture ) {
+
+		const { gl } = this;
+
+		let glTextureType;
+
+		if ( texture.isCubeTexture === true ) {
+
+			glTextureType = gl.TEXTURE_CUBE_MAP;
+
+		} else {
+
+			glTextureType = gl.TEXTURE_2D;
+
+
+		}
+
+		return glTextureType;
+
+	}
+
+	getInternalFormat( internalFormatName, glFormat, glType, colorSpace, forceLinearTransfer = false ) {
+
+		const { gl, extensions } = this;
+
+		if ( internalFormatName !== null ) {
+
+			if ( gl[ internalFormatName ] !== undefined ) return gl[ internalFormatName ];
+
+			console.warn( 'THREE.WebGLRenderer: Attempt to use non-existing WebGL internal format \'' + internalFormatName + '\'' );
+
+		}
+
+		let internalFormat = glFormat;
+
+		if ( glFormat === gl.RED ) {
+
+			if ( glType === gl.FLOAT ) internalFormat = gl.R32F;
+			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.R16F;
+			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.R8;
+
+		}
+
+		if ( glFormat === gl.RED_INTEGER ) {
+
+			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.R8UI;
+			if ( glType === gl.UNSIGNED_SHORT ) internalFormat = gl.R16UI;
+			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.R32UI;
+			if ( glType === gl.BYTE ) internalFormat = gl.R8I;
+			if ( glType === gl.SHORT ) internalFormat = gl.R16I;
+			if ( glType === gl.INT ) internalFormat = gl.R32I;
+
+		}
+
+		if ( glFormat === gl.RG ) {
+
+			if ( glType === gl.FLOAT ) internalFormat = gl.RG32F;
+			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.RG16F;
+			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = gl.RG8;
+
+		}
+
+		if ( glFormat === gl.RGBA ) {
+
+			if ( glType === gl.FLOAT ) internalFormat = gl.RGBA32F;
+			if ( glType === gl.HALF_FLOAT ) internalFormat = gl.RGBA16F;
+			if ( glType === gl.UNSIGNED_BYTE ) internalFormat = ( colorSpace === SRGBColorSpace && forceLinearTransfer === false ) ? gl.SRGB8_ALPHA8 : gl.RGBA8;
+			if ( glType === gl.UNSIGNED_SHORT_4_4_4_4 ) internalFormat = gl.RGBA4;
+			if ( glType === gl.UNSIGNED_SHORT_5_5_5_1 ) internalFormat = gl.RGB5_A1;
+
+		}
+
+		if ( glFormat === gl.DEPTH_COMPONENT ) {
+
+			if ( glType === gl.UNSIGNED_INT ) internalFormat = gl.DEPTH_COMPONENT24;
+			if ( glType === gl.FLOAT ) internalFormat = gl.DEPTH_COMPONENT32F;
+
+		}
+
+		if ( glFormat === gl.DEPTH_STENCIL ) {
+
+			if ( glType === gl.UNSIGNED_INT_24_8 ) internalFormat = gl.DEPTH24_STENCIL8;
+
+		}
+
+		if ( internalFormat === gl.R16F || internalFormat === gl.R32F ||
+			internalFormat === gl.RG16F || internalFormat === gl.RG32F ||
+			internalFormat === gl.RGBA16F || internalFormat === gl.RGBA32F ) {
+
+			extensions.get( 'EXT_color_buffer_float' );
+
+		}
+
+		return internalFormat;
+
+	}
+
+	setTextureParameters( textureType, texture ) {
+
+		const { gl, extensions } = this;
+
+		gl.texParameteri( textureType, gl.TEXTURE_WRAP_S, wrappingToGL[ texture.wrapS ] );
+		gl.texParameteri( textureType, gl.TEXTURE_WRAP_T, wrappingToGL[ texture.wrapT ] );
+
+		if ( textureType === gl.TEXTURE_3D || textureType === gl.TEXTURE_2D_ARRAY ) {
+
+			gl.texParameteri( textureType, gl.TEXTURE_WRAP_R, wrappingToGL[ texture.wrapR ] );
+
+		}
+
+		gl.texParameteri( textureType, gl.TEXTURE_MAG_FILTER, filterToGL[ texture.magFilter ] );
+		gl.texParameteri( textureType, gl.TEXTURE_MIN_FILTER, filterToGL[ texture.minFilter ] );
+
+		if ( texture.compareFunction ) {
+
+			gl.texParameteri( textureType, gl.TEXTURE_COMPARE_MODE, gl.COMPARE_REF_TO_TEXTURE );
+			gl.texParameteri( textureType, gl.TEXTURE_COMPARE_FUNC, compareToGL[ texture.compareFunction ] );
+
+		}
+
+		if ( extensions.has( 'EXT_texture_filter_anisotropic' ) === true ) {
+
+			//extension = extensions.get( 'EXT_texture_filter_anisotropic' );
+
+			if ( texture.magFilter === NearestFilter ) return;
+			if ( texture.minFilter !== NearestMipmapLinearFilter && texture.minFilter !== LinearMipmapLinearFilter ) return;
+			if ( texture.type === FloatType && extensions.has( 'OES_texture_float_linear' ) === false ) return; // verify extension for WebGL 1 and WebGL 2
+
+			if ( texture.anisotropy > 1 /*|| properties.get( texture ).__currentAnisotropy*/ ) {
+
+				//gl.texParameterf( textureType, extension.TEXTURE_MAX_ANISOTROPY_EXT, Math.min( texture.anisotropy, capabilities.getMaxAnisotropy() ) );
+				//properties.get( texture ).__currentAnisotropy = texture.anisotropy;
+
+			}
+
+		}
+
+	}
+
+}
+
+export default WebGLTextureUtils;

node_modules/three/examples/jsm/renderers/webgl/utils/WebGLUtils.js

@@ -0,0 +1,242 @@
+import { RGBA_ASTC_4x4_Format, RGBA_ASTC_5x4_Format, RGBA_ASTC_5x5_Format, RGBA_ASTC_6x5_Format, RGBA_ASTC_6x6_Format, RGBA_ASTC_8x5_Format, RGBA_ASTC_8x6_Format, RGBA_ASTC_8x8_Format, RGBA_ASTC_10x5_Format, RGBA_ASTC_10x6_Format, RGBA_ASTC_10x8_Format, RGBA_ASTC_10x10_Format, RGBA_ASTC_12x10_Format, RGBA_ASTC_12x12_Format, RGB_ETC1_Format, RGB_ETC2_Format, RGBA_ETC2_EAC_Format, RGBA_PVRTC_2BPPV1_Format, RGBA_PVRTC_4BPPV1_Format, RGB_PVRTC_2BPPV1_Format, RGB_PVRTC_4BPPV1_Format, RGBA_S3TC_DXT5_Format, RGBA_S3TC_DXT3_Format, RGBA_S3TC_DXT1_Format, RGB_S3TC_DXT1_Format, DepthFormat, DepthStencilFormat, LuminanceAlphaFormat, LuminanceFormat, RedFormat, RGBAFormat, AlphaFormat, RedIntegerFormat, RGFormat, RGIntegerFormat, RGBAIntegerFormat, HalfFloatType, FloatType, UnsignedIntType, IntType, UnsignedShortType, ShortType, ByteType, UnsignedInt248Type, UnsignedShort5551Type, UnsignedShort4444Type, UnsignedByteType, RGBA_BPTC_Format, _SRGBAFormat, RED_RGTC1_Format, SIGNED_RED_RGTC1_Format, RED_GREEN_RGTC2_Format, SIGNED_RED_GREEN_RGTC2_Format, SRGBColorSpace, NoColorSpace } from 'three';
+
+class WebGLUtils {
+
+	constructor( backend ) {
+
+		this.backend = backend;
+
+		this.gl = this.backend.gl;
+		this.extensions = backend.extensions;
+
+	}
+
+	convert( p, colorSpace = NoColorSpace ) {
+
+		const { gl, extensions } = this;
+
+		let extension;
+
+		if ( p === UnsignedByteType ) return gl.UNSIGNED_BYTE;
+		if ( p === UnsignedShort4444Type ) return gl.UNSIGNED_SHORT_4_4_4_4;
+		if ( p === UnsignedShort5551Type ) return gl.UNSIGNED_SHORT_5_5_5_1;
+
+		if ( p === ByteType ) return gl.BYTE;
+		if ( p === ShortType ) return gl.SHORT;
+		if ( p === UnsignedShortType ) return gl.UNSIGNED_SHORT;
+		if ( p === IntType ) return gl.INT;
+		if ( p === UnsignedIntType ) return gl.UNSIGNED_INT;
+		if ( p === FloatType ) return gl.FLOAT;
+
+		if ( p === HalfFloatType ) {
+
+			return gl.HALF_FLOAT;
+
+		}
+
+		if ( p === AlphaFormat ) return gl.ALPHA;
+		if ( p === RGBAFormat ) return gl.RGBA;
+		if ( p === LuminanceFormat ) return gl.LUMINANCE;
+		if ( p === LuminanceAlphaFormat ) return gl.LUMINANCE_ALPHA;
+		if ( p === DepthFormat ) return gl.DEPTH_COMPONENT;
+		if ( p === DepthStencilFormat ) return gl.DEPTH_STENCIL;
+
+		// WebGL2 formats.
+
+		if ( p === RedFormat ) return gl.RED;
+		if ( p === RedIntegerFormat ) return gl.RED_INTEGER;
+		if ( p === RGFormat ) return gl.RG;
+		if ( p === RGIntegerFormat ) return gl.RG_INTEGER;
+		if ( p === RGBAIntegerFormat ) return gl.RGBA_INTEGER;
+
+		// S3TC
+
+		if ( p === RGB_S3TC_DXT1_Format || p === RGBA_S3TC_DXT1_Format || p === RGBA_S3TC_DXT3_Format || p === RGBA_S3TC_DXT5_Format ) {
+
+			if ( colorSpace === SRGBColorSpace ) {
+
+				extension = extensions.get( 'WEBGL_compressed_texture_s3tc_srgb' );
+
+				if ( extension !== null ) {
+
+					if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_S3TC_DXT1_EXT;
+					if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
+					if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
+					if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
+
+				} else {
+
+					return null;
+
+				}
+
+			} else {
+
+				extension = extensions.get( 'WEBGL_compressed_texture_s3tc' );
+
+				if ( extension !== null ) {
+
+					if ( p === RGB_S3TC_DXT1_Format ) return extension.COMPRESSED_RGB_S3TC_DXT1_EXT;
+					if ( p === RGBA_S3TC_DXT1_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT1_EXT;
+					if ( p === RGBA_S3TC_DXT3_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT3_EXT;
+					if ( p === RGBA_S3TC_DXT5_Format ) return extension.COMPRESSED_RGBA_S3TC_DXT5_EXT;
+
+				} else {
+
+					return null;
+
+				}
+
+			}
+
+		}
+
+		// PVRTC
+
+		if ( p === RGB_PVRTC_4BPPV1_Format || p === RGB_PVRTC_2BPPV1_Format || p === RGBA_PVRTC_4BPPV1_Format || p === RGBA_PVRTC_2BPPV1_Format ) {
+
+			extension = extensions.get( 'WEBGL_compressed_texture_pvrtc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGB_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_4BPPV1_IMG;
+				if ( p === RGB_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGB_PVRTC_2BPPV1_IMG;
+				if ( p === RGBA_PVRTC_4BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_4BPPV1_IMG;
+				if ( p === RGBA_PVRTC_2BPPV1_Format ) return extension.COMPRESSED_RGBA_PVRTC_2BPPV1_IMG;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		// ETC1
+
+		if ( p === RGB_ETC1_Format ) {
+
+			extension = extensions.get( 'WEBGL_compressed_texture_etc1' );
+
+			if ( extension !== null ) {
+
+				return extension.COMPRESSED_RGB_ETC1_WEBGL;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		// ETC2
+
+		if ( p === RGB_ETC2_Format || p === RGBA_ETC2_EAC_Format ) {
+
+			extension = extensions.get( 'WEBGL_compressed_texture_etc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGB_ETC2_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ETC2 : extension.COMPRESSED_RGB8_ETC2;
+				if ( p === RGBA_ETC2_EAC_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ETC2_EAC : extension.COMPRESSED_RGBA8_ETC2_EAC;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		// ASTC
+
+		if ( p === RGBA_ASTC_4x4_Format || p === RGBA_ASTC_5x4_Format || p === RGBA_ASTC_5x5_Format ||
+			p === RGBA_ASTC_6x5_Format || p === RGBA_ASTC_6x6_Format || p === RGBA_ASTC_8x5_Format ||
+			p === RGBA_ASTC_8x6_Format || p === RGBA_ASTC_8x8_Format || p === RGBA_ASTC_10x5_Format ||
+			p === RGBA_ASTC_10x6_Format || p === RGBA_ASTC_10x8_Format || p === RGBA_ASTC_10x10_Format ||
+			p === RGBA_ASTC_12x10_Format || p === RGBA_ASTC_12x12_Format ) {
+
+			extension = extensions.get( 'WEBGL_compressed_texture_astc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGBA_ASTC_4x4_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR : extension.COMPRESSED_RGBA_ASTC_4x4_KHR;
+				if ( p === RGBA_ASTC_5x4_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR : extension.COMPRESSED_RGBA_ASTC_5x4_KHR;
+				if ( p === RGBA_ASTC_5x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR : extension.COMPRESSED_RGBA_ASTC_5x5_KHR;
+				if ( p === RGBA_ASTC_6x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR : extension.COMPRESSED_RGBA_ASTC_6x5_KHR;
+				if ( p === RGBA_ASTC_6x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR : extension.COMPRESSED_RGBA_ASTC_6x6_KHR;
+				if ( p === RGBA_ASTC_8x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR : extension.COMPRESSED_RGBA_ASTC_8x5_KHR;
+				if ( p === RGBA_ASTC_8x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR : extension.COMPRESSED_RGBA_ASTC_8x6_KHR;
+				if ( p === RGBA_ASTC_8x8_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR : extension.COMPRESSED_RGBA_ASTC_8x8_KHR;
+				if ( p === RGBA_ASTC_10x5_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR : extension.COMPRESSED_RGBA_ASTC_10x5_KHR;
+				if ( p === RGBA_ASTC_10x6_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR : extension.COMPRESSED_RGBA_ASTC_10x6_KHR;
+				if ( p === RGBA_ASTC_10x8_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR : extension.COMPRESSED_RGBA_ASTC_10x8_KHR;
+				if ( p === RGBA_ASTC_10x10_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR : extension.COMPRESSED_RGBA_ASTC_10x10_KHR;
+				if ( p === RGBA_ASTC_12x10_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR : extension.COMPRESSED_RGBA_ASTC_12x10_KHR;
+				if ( p === RGBA_ASTC_12x12_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR : extension.COMPRESSED_RGBA_ASTC_12x12_KHR;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		// BPTC
+
+		if ( p === RGBA_BPTC_Format ) {
+
+			extension = extensions.get( 'EXT_texture_compression_bptc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGBA_BPTC_Format ) return ( colorSpace === SRGBColorSpace ) ? extension.COMPRESSED_SRGB_ALPHA_BPTC_UNORM_EXT : extension.COMPRESSED_RGBA_BPTC_UNORM_EXT;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		// RGTC
+
+		if ( p === RED_RGTC1_Format || p === SIGNED_RED_RGTC1_Format || p === RED_GREEN_RGTC2_Format || p === SIGNED_RED_GREEN_RGTC2_Format ) {
+
+			extension = extensions.get( 'EXT_texture_compression_rgtc' );
+
+			if ( extension !== null ) {
+
+				if ( p === RGBA_BPTC_Format ) return extension.COMPRESSED_RED_RGTC1_EXT;
+				if ( p === SIGNED_RED_RGTC1_Format ) return extension.COMPRESSED_SIGNED_RED_RGTC1_EXT;
+				if ( p === RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_RED_GREEN_RGTC2_EXT;
+				if ( p === SIGNED_RED_GREEN_RGTC2_Format ) return extension.COMPRESSED_SIGNED_RED_GREEN_RGTC2_EXT;
+
+			} else {
+
+				return null;
+
+			}
+
+		}
+
+		//
+
+		if ( p === UnsignedInt248Type ) {
+
+			return gl.UNSIGNED_INT_24_8;
+
+		}
+
+		// if "p" can't be resolved, assume the user defines a WebGL constant as a string (fallback/workaround for packed RGB formats)
+
+		return ( gl[ p ] !== undefined ) ? gl[ p ] : null;
+
+	}
+
+}
+
+export default WebGLUtils;