64 lines
1.6 KiB
JavaScript
64 lines
1.6 KiB
JavaScript
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define([
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'../Core/Cartesian2',
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'../Core/Cartesian3',
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'../Core/Cartesian4',
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'../Core/ComponentDatatype',
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'../Core/Matrix2',
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'../Core/Matrix3',
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'../Core/Matrix4'
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], function(
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Cartesian2,
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Cartesian3,
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Cartesian4,
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ComponentDatatype,
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Matrix2,
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Matrix3,
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Matrix4) {
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'use strict';
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var ComponentsPerAttribute = {
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SCALAR : 1,
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VEC2 : 2,
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VEC3 : 3,
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VEC4 : 4,
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MAT2 : 4,
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MAT3 : 9,
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MAT4 : 16
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};
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var ClassPerType = {
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SCALAR : undefined,
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VEC2 : Cartesian2,
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VEC3 : Cartesian3,
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VEC4 : Cartesian4,
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MAT2 : Matrix2,
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MAT3 : Matrix3,
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MAT4 : Matrix4
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};
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/**
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* @private
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*/
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function getBinaryAccessor(accessor) {
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var componentType = accessor.componentType;
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var componentDatatype;
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if (typeof componentType === 'string') {
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componentDatatype = ComponentDatatype.fromName(componentType);
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} else {
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componentDatatype = componentType;
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}
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var componentsPerAttribute = ComponentsPerAttribute[accessor.type];
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var classType = ClassPerType[accessor.type];
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return {
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componentsPerAttribute : componentsPerAttribute,
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classType : classType,
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createArrayBufferView : function(buffer, byteOffset, length) {
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return ComponentDatatype.createArrayBufferView(componentDatatype, buffer, byteOffset, componentsPerAttribute * length);
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}
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};
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}
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return getBinaryAccessor;
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});
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