58 lines
2.0 KiB
JavaScript
58 lines
2.0 KiB
JavaScript
define([
|
|
'./getAccessorByteStride',
|
|
'./getComponentReader',
|
|
'./numberOfComponentsForType',
|
|
'../../Core/arrayFill',
|
|
'../../Core/ComponentDatatype',
|
|
'../../Core/defined'
|
|
], function(
|
|
getAccessorByteStride,
|
|
getComponentReader,
|
|
numberOfComponentsForType,
|
|
arrayFill,
|
|
ComponentDatatype,
|
|
defined) {
|
|
'use strict';
|
|
|
|
/**
|
|
* Returns the accessor data in a contiguous array.
|
|
*
|
|
* @param {Object} gltf A javascript object containing a glTF asset.
|
|
* @param {Object} accessor The accessor.
|
|
* @returns {Array} The accessor values in a contiguous array.
|
|
*
|
|
* @private
|
|
*/
|
|
function readAccessorPacked(gltf, accessor) {
|
|
var byteStride = getAccessorByteStride(gltf, accessor);
|
|
var componentTypeByteLength = ComponentDatatype.getSizeInBytes(accessor.componentType);
|
|
var numberOfComponents = numberOfComponentsForType(accessor.type);
|
|
var count = accessor.count;
|
|
var values = new Array(numberOfComponents * count);
|
|
|
|
if (!defined(accessor.bufferView)) {
|
|
arrayFill(values, 0);
|
|
return values;
|
|
}
|
|
|
|
var bufferView = gltf.bufferViews[accessor.bufferView];
|
|
var source = gltf.buffers[bufferView.buffer].extras._pipeline.source;
|
|
var byteOffset = accessor.byteOffset + bufferView.byteOffset + source.byteOffset;
|
|
|
|
var dataView = new DataView(source.buffer);
|
|
var components = new Array(numberOfComponents);
|
|
var componentReader = getComponentReader(accessor.componentType);
|
|
|
|
for (var i = 0; i < count; ++i) {
|
|
componentReader(dataView, byteOffset, numberOfComponents, componentTypeByteLength, components);
|
|
for (var j = 0; j < numberOfComponents; ++j) {
|
|
values[i * numberOfComponents + j] = components[j];
|
|
}
|
|
byteOffset += byteStride;
|
|
}
|
|
return values;
|
|
}
|
|
|
|
return readAccessorPacked;
|
|
});
|