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120 lines
2.3 KiB
JavaScript
120 lines
2.3 KiB
JavaScript
2 years ago
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class WebGLAttributeUtils {
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constructor( backend ) {
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this.backend = backend;
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}
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createAttribute( attribute, bufferType ) {
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const backend = this.backend;
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const { gl } = backend;
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const array = attribute.array;
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const usage = attribute.usage || gl.STATIC_DRAW;
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const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
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const bufferData = backend.get( bufferAttribute );
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let bufferGPU = bufferData.bufferGPU;
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if ( bufferGPU === undefined ) {
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bufferGPU = gl.createBuffer();
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gl.bindBuffer( bufferType, bufferGPU );
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gl.bufferData( bufferType, array, usage );
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gl.bindBuffer( bufferType, null );
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bufferData.bufferGPU = bufferGPU;
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bufferData.bufferType = bufferType;
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bufferData.version = bufferAttribute.version;
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}
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//attribute.onUploadCallback();
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let type;
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let isFloat = false;
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if ( array instanceof Float32Array ) {
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type = gl.FLOAT;
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isFloat = true;
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} else if ( array instanceof Uint16Array ) {
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if ( attribute.isFloat16BufferAttribute ) {
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type = gl.HALF_FLOAT;
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isFloat = true;
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} else {
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type = gl.UNSIGNED_SHORT;
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}
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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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} else if ( array instanceof Uint8ClampedArray ) {
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type = gl.UNSIGNED_BYTE;
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} else {
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throw new Error( 'THREE.WebGLBackend: Unsupported buffer data format: ' + array );
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}
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backend.set( attribute, {
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bufferGPU,
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type,
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bytesPerElement: array.BYTES_PER_ELEMENT,
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version: attribute.version,
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isFloat
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} );
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}
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updateAttribute( attribute ) {
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const backend = this.backend;
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const { gl } = backend;
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const array = attribute.array;
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const bufferAttribute = attribute.isInterleavedBufferAttribute ? attribute.data : attribute;
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const bufferData = backend.get( bufferAttribute );
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const bufferType = bufferData.bufferType;
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gl.bindBuffer( bufferType, bufferData.bufferGPU );
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gl.bufferSubData( bufferType, 0, array );
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gl.bindBuffer( bufferType, null );
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bufferData.version = bufferAttribute.version;
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}
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}
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export default WebGLAttributeUtils;
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