internal AccessorSparseIndices(BufferView bv, int byteOffset, IndexEncodingType encoding)
{
Guard.NotNull(bv, nameof(bv));
Guard.MustBeGreaterThanOrEqualTo(byteOffset, _byteOffsetMinimum, nameof(byteOffset));
this._bufferView = bv.LogicalIndex;
this._byteOffset = byteOffset.AsNullable(_byteOffsetDefault);
this._componentType = encoding;
}
internal AccessorSparse(BufferView indices, int indicesOffset, IndexEncodingType indicesEncoding, BufferView values, int valuesOffset, int count)
{
Guard.NotNull(indices, nameof(indices));
Guard.NotNull(values, nameof(values));
Guard.MustBeGreaterThanOrEqualTo(count, _countMinimum, nameof(count));
this._count = count;
this._indices = new AccessorSparseIndices(indices, indicesOffset, indicesEncoding);
this._values = new AccessorSparseValues(values, valuesOffset);
}
protected override void DeserializeProperty(string jsonPropertyName, JsonReader reader)
{
switch (jsonPropertyName)
{
case "bufferView": _bufferView = DeserializePropertyValue <Int32>(reader); break;
case "byteOffset": _byteOffset = DeserializePropertyValue <Int32?>(reader); break;
case "componentType": _componentType = DeserializePropertyValue <IndexEncodingType>(reader); break;
default: base.DeserializeProperty(jsonPropertyName, reader); break;
}
}
public static EncodingType ToComponent(this IndexEncodingType t)
{
switch (t)
{
case IndexEncodingType.UNSIGNED_BYTE: return(EncodingType.UNSIGNED_BYTE);
case IndexEncodingType.UNSIGNED_SHORT: return(EncodingType.UNSIGNED_SHORT);
case IndexEncodingType.UNSIGNED_INT: return(EncodingType.UNSIGNED_INT);
default: throw new NotImplementedException();
}
}
public static int ByteLength(this IndexEncodingType encoding)
{
switch (encoding)
{
case IndexEncodingType.UNSIGNED_BYTE: return(1);
case IndexEncodingType.UNSIGNED_SHORT: return(2);
case IndexEncodingType.UNSIGNED_INT: return(4);
default: throw new NotImplementedException();
}
}
/// <summary>
/// Associates this <see cref="Accessor"/> with a <see cref="BufferView"/>
/// </summary>
/// <param name="buffer">The <see cref="BufferView"/> source.</param>
/// <param name="bufferByteOffset">The start byte offset within <paramref name="buffer"/>.</param>
/// <param name="itemCount">The number of items in the accessor.</param>
/// <param name="encoding">The <see cref="IndexEncodingType"/> item encoding.</param>
public void SetIndexData(BufferView buffer, int bufferByteOffset, int itemCount, IndexEncodingType encoding)
{
Guard.NotNull(buffer, nameof(buffer));
Guard.MustShareLogicalParent(this, buffer, nameof(buffer));
if (buffer.DeviceBufferTarget.HasValue)
{
Guard.IsTrue(buffer.DeviceBufferTarget.Value == BufferMode.ELEMENT_ARRAY_BUFFER, nameof(buffer));
}
SetData(buffer, bufferByteOffset, itemCount, DimensionType.SCALAR, encoding.ToComponent(), false);
}
/// <summary>
/// Associates this <see cref="Accessor"/> with a <see cref="BufferView"/>
/// </summary>
/// <param name="buffer">The <see cref="BufferView"/> source.</param>
/// <param name="bufferByteOffset">The start byte offset within <paramref name="buffer"/>.</param>
/// <param name="itemCount">The number of items in the accessor.</param>
/// <param name="encoding">The <see cref="IndexEncodingType"/> item encoding.</param>
public void SetIndexData(BufferView buffer, int bufferByteOffset, int itemCount, IndexEncodingType encoding)
{
Guard.NotNull(buffer, nameof(buffer));
Guard.MustShareLogicalParent(this, buffer, nameof(buffer));
Guard.IsFalse(buffer.IsVertexBuffer, nameof(buffer));
SetData(buffer, bufferByteOffset, itemCount, DimensionType.SCALAR, encoding.ToComponent(), false);
}
public static IEnumerable <(int, int, int)> GetTrianglesIndices(this PrimitiveType ptype, IEnumerable <UInt32> sourceIndices, IndexEncodingType sourceEncoding)
{
switch (ptype)
{
case PrimitiveType.TRIANGLES:
{
using (var ptr = sourceIndices.GetEnumerator())
{
while (true)
{
if (!ptr.MoveNext())
{
break;
}
var a = ptr.Current;
if (!ptr.MoveNext())
{
break;
}
var b = ptr.Current;
if (!ptr.MoveNext())
{
break;
}
var c = ptr.Current;
if (!_IsDegenerated(a, b, c))
{
yield return((int)a, (int)b, (int)c);
}
}
}
break;
}
case PrimitiveType.TRIANGLE_FAN:
{
using (var ptr = sourceIndices.GetEnumerator())
{
if (!ptr.MoveNext())
{
break;
}
var a = ptr.Current;
if (!ptr.MoveNext())
{
break;
}
var b = ptr.Current;
while (true)
{
if (!ptr.MoveNext())
{
break;
}
var c = ptr.Current;
if (!_IsDegenerated(a, b, c))
{
yield return((int)a, (int)b, (int)c);
}
b = c;
}
}
break;
}
case PrimitiveType.TRIANGLE_STRIP:
{
using (var ptr = sourceIndices.GetEnumerator())
{
if (!ptr.MoveNext())
{
break;
}
var a = ptr.Current;
if (!ptr.MoveNext())
{
break;
}
var b = ptr.Current;
bool reversed = false;
while (true)
{
if (!ptr.MoveNext())
{
break;
}
var c = ptr.Current;
if (!_IsDegenerated(a, b, c))
{
if (reversed)
{
yield return((int)b, (int)a, (int)c);
}
else
{
yield return((int)a, (int)b, (int)c);
}
}
a = b;
b = c;
reversed = !reversed;
}
}
break;
}
}
}