private static OnDiskBufferData BufferDataFromDATA(IKeyValueCollection data)
{
OnDiskBufferData buffer = new OnDiskBufferData();
buffer.ElementCount = data.GetUInt32Property("m_nElementCount");
buffer.ElementSizeInBytes = data.GetUInt32Property("m_nElementSizeInBytes");
buffer.InputLayoutFields = new List <RenderInputLayoutField>();
var inputLayoutFields = data.GetArray("m_inputLayoutFields");
foreach (var il in inputLayoutFields)
{
RenderInputLayoutField attrib = new RenderInputLayoutField();
//null-terminated string
attrib.SemanticName = System.Text.Encoding.UTF8.GetString(il.GetArray <byte>("m_pSemanticName")).TrimEnd((char)0);
attrib.SemanticIndex = il.GetInt32Property("m_nSemanticIndex");
attrib.Format = (DXGI_FORMAT)il.GetUInt32Property("m_Format");
attrib.Offset = il.GetUInt32Property("m_nOffset");
attrib.Slot = il.GetInt32Property("m_nSlot");
attrib.SlotType = (RenderSlotType)il.GetUInt32Property("m_nSlotType");
attrib.InstanceStepRate = il.GetInt32Property("m_nInstanceStepRate");
buffer.InputLayoutFields.Add(attrib);
}
buffer.Data = data.GetArray <byte>("m_pData");
return(buffer);
}
public static float[] ReadVertexAttribute(int offset, OnDiskBufferData vertexBuffer, RenderInputLayoutField attribute)
{
float[] result;
offset = (int)(offset * vertexBuffer.ElementSizeInBytes) + (int)attribute.Offset;
// Useful reference: https://github.com/apitrace/dxsdk/blob/master/Include/d3dx_dxgiformatconvert.inl
switch (attribute.Format)
{
case DXGI_FORMAT.R32G32B32_FLOAT:
{
result = new float[3];
Buffer.BlockCopy(vertexBuffer.Data, offset, result, 0, 12);
break;
}
case DXGI_FORMAT.R32G32B32A32_FLOAT:
{
result = new float[4];
Buffer.BlockCopy(vertexBuffer.Data, offset, result, 0, 16);
break;
}
case DXGI_FORMAT.R16G16_UNORM:
{
var shorts = new ushort[2];
Buffer.BlockCopy(vertexBuffer.Data, offset, shorts, 0, 4);
result = new[]
{
shorts[0] / 65535f,
shorts[1] / 65535f,
};
break;
}
case DXGI_FORMAT.R16G16_FLOAT:
{
var shorts = new ushort[2];
Buffer.BlockCopy(vertexBuffer.Data, offset, shorts, 0, 4);
result = new[]
{
HalfTypeHelper.Convert(shorts[0]),
HalfTypeHelper.Convert(shorts[1]),
};
break;
}
case DXGI_FORMAT.R32_FLOAT:
{
result = new float[1];
Buffer.BlockCopy(vertexBuffer.Data, offset, result, 0, 4);
break;
}
case DXGI_FORMAT.R32G32_FLOAT:
{
result = new float[2];
Buffer.BlockCopy(vertexBuffer.Data, offset, result, 0, 8);
break;
}
case DXGI_FORMAT.R16G16_SINT:
{
var shorts = new short[2];
Buffer.BlockCopy(vertexBuffer.Data, offset, shorts, 0, 4);
result = new float[2];
for (var i = 0; i < 2; i++)
{
result[i] = shorts[i];
}
break;
}
case DXGI_FORMAT.R16G16B16A16_SINT:
{
var shorts = new short[4];
Buffer.BlockCopy(vertexBuffer.Data, offset, shorts, 0, 8);
result = new float[4];
for (var i = 0; i < 4; i++)
{
result[i] = shorts[i];
}
break;
}
case DXGI_FORMAT.R8G8B8A8_UINT:
case DXGI_FORMAT.R8G8B8A8_UNORM:
{
var bytes = new byte[4];
Buffer.BlockCopy(vertexBuffer.Data, offset, bytes, 0, 4);
result = new float[4];
for (var i = 0; i < 4; i++)
{
result[i] = attribute.Format == DXGI_FORMAT.R8G8B8A8_UNORM
? bytes[i] / 255f
: bytes[i];
}
break;
}
default:
throw new NotImplementedException($"Unsupported \"{attribute.SemanticName}\" DXGI_FORMAT.{attribute.Format}");
}
return(result);
}