Initial commit

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;