private void PlatformConstruct(
GraphicsDevice graphicsDevice,
uint sizeInBytes,
uint elementSizeInBytes,
BufferBindFlags flags,
ResourceUsage usage,
byte[] initialData)
{
var optionFlags = flags.HasFlag(BufferBindFlags.ShaderResource)
? D3D11.ResourceOptionFlags.BufferStructured
: D3D11.ResourceOptionFlags.None;
var cpuAccessFlags = usage == ResourceUsage.Dynamic
? D3D11.CpuAccessFlags.Write
: D3D11.CpuAccessFlags.None;
var d3d11Usage = usage == ResourceUsage.Dynamic
? D3D11.ResourceUsage.Dynamic
: D3D11.ResourceUsage.Immutable;
var description = new D3D11.BufferDescription
{
BindFlags = flags.ToBindFlags(),
CpuAccessFlags = cpuAccessFlags,
OptionFlags = optionFlags,
SizeInBytes = (int)sizeInBytes,
StructureByteStride = (int)elementSizeInBytes,
Usage = d3d11Usage
};
if (usage == ResourceUsage.Static)
{
using (var dataStream = DataStream.Create(initialData, true, false))
{
DeviceBuffer = AddDisposable(new D3D11.Buffer(
graphicsDevice.Device,
dataStream,
description));
}
}
else
{
DeviceBuffer = AddDisposable(new D3D11.Buffer(
graphicsDevice.Device,
description));
}
}
protected Buffer(
GraphicsDevice graphicsDevice,
uint elementSizeInBytes,
uint elementCount,
BufferBindFlags flags,
ResourceUsage usage,
byte[] initialData)
: base(graphicsDevice)
{
if (usage == ResourceUsage.Dynamic && initialData != null)
{
throw new ArgumentOutOfRangeException();
}
if (usage == ResourceUsage.Static && initialData == null)
{
throw new ArgumentOutOfRangeException();
}
ElementSizeInBytes = elementSizeInBytes;
ElementCount = elementCount;
var alignedElementSize = flags.HasFlag(BufferBindFlags.ConstantBuffer)
? PlatformGetAlignedSize(elementSizeInBytes)
: elementSizeInBytes;
SizeInBytes = alignedElementSize * elementCount;
BindFlags = flags;
Usage = usage;
PlatformConstruct(
graphicsDevice,
SizeInBytes,
elementSizeInBytes,
flags,
usage,
initialData);
}