public TypedArrayStorageFromBufferView(ResourcesStore store,
int bufferViewIndex,
int byteOffset,
int componentSize, // Size of primitives (e.g. int = 4)
int componentNum, // Number of primitives in compound values (e.g. VEC3 = 3)
int count) // Number of compound values (e.g. Number of VEC3)
{
var bufferView = store.Gltf.BufferViews[bufferViewIndex];
var r = store.GetOrLoadBufferViewResourceAt(bufferViewIndex);
var compoundSize = componentSize * componentNum; // Size in bytes sizeof(int * VEC3) = 4 * 3
var stride = bufferView.ByteStride != null ? bufferView.ByteStride.Value : compoundSize;
var buffer = new ArraySegment <byte>(r.Data.Array, r.Data.Offset + byteOffset, count * stride);
Storage = new TypedArrayStorage <T>(buffer, byteOffset, stride, count);
}
public TypedBuffer(ResourcesStore store, Types.Accessor accessor)
{
Store = store;
Accessor = accessor;
}
public TypedArrayEntity(ResourcesStore store, Accessor accessor)
{
Length = accessor.Count;
if (accessor.BufferView != null)
{
DenseView = new TypedArrayStorageFromBufferView <T>(
store, accessor.BufferView.Value,
accessor.ByteOffset,
accessor.ComponentType.SizeInBytes(),
accessor.Type.NumOfComponents(),
accessor.Count);
}
if (accessor.Sparse != null)
{
var sparse = accessor.Sparse;
var indices = sparse.Indices;
switch (indices.ComponentType)
{
case Types.Accessor.SparseType.IndicesType.ComponentTypeEnum.UNSIGNED_BYTE:
SparseIndices = new TypedArrayStorageFromBufferView <byte>(
store, indices.BufferView,
indices.ByteOffset,
indices.ComponentType.SizeInBytes(),
1, // must be scalar
sparse.Count
).CastTo <uint>();
break;
case Types.Accessor.SparseType.IndicesType.ComponentTypeEnum.UNSIGNED_SHORT:
SparseIndices = new TypedArrayStorageFromBufferView <ushort>(
store, indices.BufferView,
indices.ByteOffset,
indices.ComponentType.SizeInBytes(),
1, // must be scalar
sparse.Count
).CastTo <uint>();
break;
case Types.Accessor.SparseType.IndicesType.ComponentTypeEnum.UNSIGNED_INT:
SparseIndices = new TypedArrayStorageFromBufferView <uint>(
store, indices.BufferView,
indices.ByteOffset,
indices.ComponentType.SizeInBytes(),
1, // must be scalar
sparse.Count
);
break;
}
var values = sparse.Values;
SparseValues = new TypedArrayStorageFromBufferView <T>(
store, values.BufferView,
values.ByteOffset,
accessor.ComponentType.SizeInBytes(),
accessor.Type.NumOfComponents(),
sparse.Count);
}
}
