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node_modules/three/src/renderers/webgl/WebGLGeometries.js

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+import { Uint16BufferAttribute, Uint32BufferAttribute } from '../../core/BufferAttribute.js';
+
+function WebGLGeometries( gl, attributes, info, bindingStates ) {
+
+	const geometries = {};
+	const wireframeAttributes = new WeakMap();
+
+	function onGeometryDispose( event ) {
+
+		const geometry = event.target;
+
+		if ( geometry.index !== null ) {
+
+			attributes.remove( geometry.index );
+
+		}
+
+		for ( const name in geometry.attributes ) {
+
+			attributes.remove( geometry.attributes[ name ] );
+
+		}
+
+		geometry.removeEventListener( 'dispose', onGeometryDispose );
+
+		delete geometries[ geometry.id ];
+
+		const attribute = wireframeAttributes.get( geometry );
+
+		if ( attribute ) {
+
+			attributes.remove( attribute );
+			wireframeAttributes.delete( geometry );
+
+		}
+
+		bindingStates.releaseStatesOfGeometry( geometry );
+
+		if ( geometry.isInstancedBufferGeometry === true ) {
+
+			delete geometry._maxInstanceCount;
+
+		}
+
+		//
+
+		info.memory.geometries --;
+
+	}
+
+	function get( object, geometry ) {
+
+		if ( geometries[ geometry.id ] === true ) return geometry;
+
+		geometry.addEventListener( 'dispose', onGeometryDispose );
+
+		geometries[ geometry.id ] = true;
+
+		info.memory.geometries ++;
+
+		return geometry;
+
+	}
+
+	function update( geometry ) {
+
+		const geometryAttributes = geometry.attributes;
+
+		// Updating index buffer in VAO now. See WebGLBindingStates.
+
+		for ( const name in geometryAttributes ) {
+
+			attributes.update( geometryAttributes[ name ], gl.ARRAY_BUFFER );
+
+		}
+
+	}
+
+	function updateWireframeAttribute( geometry ) {
+
+		const indices = [];
+
+		const geometryIndex = geometry.index;
+		const geometryPosition = geometry.attributes.position;
+		let version = 0;
+
+		if ( geometryPosition === undefined ) {
+
+			return;
+
+		}
+
+		if ( geometryIndex !== null ) {
+
+			const array = geometryIndex.array;
+			version = geometryIndex.version;
+
+			for ( let i = 0, l = array.length; i < l; i += 3 ) {
+
+				const a = array[ i + 0 ];
+				const b = array[ i + 1 ];
+				const c = array[ i + 2 ];
+
+				indices.push( a, b, b, c, c, a );
+
+			}
+
+		} else {
+
+			const array = geometryPosition.array;
+			version = geometryPosition.version;
+
+			for ( let i = 0, l = ( array.length / 3 ) - 1; i < l; i += 3 ) {
+
+				const a = i + 0;
+				const b = i + 1;
+				const c = i + 2;
+
+				indices.push( a, b, b, c, c, a );
+
+			}
+
+		}
+
+		// check whether a 32 bit or 16 bit buffer is required to store the indices
+		// account for PRIMITIVE_RESTART_FIXED_INDEX, #24565
+		const attribute = new ( geometryPosition.count >= 65535 ? Uint32BufferAttribute : Uint16BufferAttribute )( indices, 1 );
+		attribute.version = version;
+
+		// Updating index buffer in VAO now. See WebGLBindingStates
+
+		//
+
+		const previousAttribute = wireframeAttributes.get( geometry );
+
+		if ( previousAttribute ) attributes.remove( previousAttribute );
+
+		//
+
+		wireframeAttributes.set( geometry, attribute );
+
+	}
+
+	function getWireframeAttribute( geometry ) {
+
+		const currentAttribute = wireframeAttributes.get( geometry );
+
+		if ( currentAttribute ) {
+
+			const geometryIndex = geometry.index;
+
+			if ( geometryIndex !== null ) {
+
+				// if the attribute is obsolete, create a new one
+
+				if ( currentAttribute.version < geometryIndex.version ) {
+
+					updateWireframeAttribute( geometry );
+
+				}
+
+			}
+
+		} else {
+
+			updateWireframeAttribute( geometry );
+
+		}
+
+		return wireframeAttributes.get( geometry );
+
+	}
+
+	return {
+
+		get: get,
+		update: update,
+
+		getWireframeAttribute: getWireframeAttribute
+
+	};
+
+}
+
+
+export { WebGLGeometries };