156 lines
2.9 KiB
JavaScript
156 lines
2.9 KiB
JavaScript
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/**
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* @author mrdoob / http://mrdoob.com/
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*/
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function WebGLAttributes( gl ) {
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var buffers = new WeakMap();
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function createBuffer( attribute, bufferType ) {
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var array = attribute.array;
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var usage = attribute.dynamic ? gl.DYNAMIC_DRAW : gl.STATIC_DRAW;
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var buffer = gl.createBuffer();
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gl.bindBuffer( bufferType, buffer );
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gl.bufferData( bufferType, array, usage );
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attribute.onUploadCallback();
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var type = gl.FLOAT;
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if ( array instanceof Float32Array ) {
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type = gl.FLOAT;
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} else if ( array instanceof Float64Array ) {
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console.warn( 'THREE.WebGLAttributes: Unsupported data buffer format: Float64Array.' );
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} else if ( array instanceof Uint16Array ) {
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type = gl.UNSIGNED_SHORT;
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} else if ( array instanceof Int16Array ) {
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type = gl.SHORT;
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} else if ( array instanceof Uint32Array ) {
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type = gl.UNSIGNED_INT;
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} else if ( array instanceof Int32Array ) {
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type = gl.INT;
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} else if ( array instanceof Int8Array ) {
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type = gl.BYTE;
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} else if ( array instanceof Uint8Array ) {
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type = gl.UNSIGNED_BYTE;
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}
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return {
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buffer: buffer,
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type: type,
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bytesPerElement: array.BYTES_PER_ELEMENT,
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version: attribute.version
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};
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}
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function updateBuffer( buffer, attribute, bufferType ) {
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var array = attribute.array;
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var updateRange = attribute.updateRange;
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gl.bindBuffer( bufferType, buffer );
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if ( attribute.dynamic === false ) {
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gl.bufferData( bufferType, array, gl.STATIC_DRAW );
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} else if ( updateRange.count === - 1 ) {
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// Not using update ranges
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gl.bufferSubData( bufferType, 0, array );
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} else if ( updateRange.count === 0 ) {
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console.error( 'THREE.WebGLObjects.updateBuffer: dynamic THREE.BufferAttribute marked as needsUpdate but updateRange.count is 0, ensure you are using set methods or updating manually.' );
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} else {
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gl.bufferSubData( bufferType, updateRange.offset * array.BYTES_PER_ELEMENT,
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array.subarray( updateRange.offset, updateRange.offset + updateRange.count ) );
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updateRange.count = - 1; // reset range
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}
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}
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//
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function get( attribute ) {
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if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;
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return buffers.get( attribute );
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}
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function remove( attribute ) {
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if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;
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var data = buffers.get( attribute );
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if ( data ) {
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gl.deleteBuffer( data.buffer );
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buffers.delete( attribute );
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}
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}
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function update( attribute, bufferType ) {
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if ( attribute.isInterleavedBufferAttribute ) attribute = attribute.data;
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var data = buffers.get( attribute );
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if ( data === undefined ) {
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buffers.set( attribute, createBuffer( attribute, bufferType ) );
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} else if ( data.version < attribute.version ) {
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updateBuffer( data.buffer, attribute, bufferType );
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data.version = attribute.version;
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}
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}
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return {
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get: get,
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remove: remove,
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update: update
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};
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}
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export { WebGLAttributes };
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