/// <summary>
///
/// </summary>
/// <param name="structureStride"></param>
/// <param name="structureCount"></param>
void Create(GraphicsDevice device, int structureStride, int structureCount, StructuredBufferFlags flags)
{
StructureCapacity = structureCount;
StructureStride = structureStride;
Width = structureCount;
Height = 0;
Depth = 0;
// create staging buffer :
var bufferDesc = new BufferDescription {
BindFlags = BindFlags.None,
Usage = ResourceUsage.Staging,
CpuAccessFlags = CpuAccessFlags.Write | CpuAccessFlags.Read,
OptionFlags = ResourceOptionFlags.BufferStructured,
SizeInBytes = structureCount * structureStride,
StructureByteStride = structureStride
};
bufferStaging = new Buffer(device.Device, bufferDesc);
// create count buffer :
bufferDesc = new BufferDescription {
BindFlags = BindFlags.None,
Usage = ResourceUsage.Staging,
CpuAccessFlags = CpuAccessFlags.Write | CpuAccessFlags.Read,
OptionFlags = ResourceOptionFlags.None,
SizeInBytes = 4,
};
bufferCount = new Buffer(device.Device, bufferDesc);
// create GPU buffer :
bufferDesc = new BufferDescription {
BindFlags = BindFlags.UnorderedAccess | BindFlags.ShaderResource,
Usage = ResourceUsage.Default,
CpuAccessFlags = CpuAccessFlags.None,
OptionFlags = ResourceOptionFlags.BufferStructured,
SizeInBytes = structureCount * structureStride,
StructureByteStride = structureStride
};
bufferGpu = new Buffer(device.Device, bufferDesc);
var uavFlag = UnorderedAccessViewBufferFlags.None;
if (flags == StructuredBufferFlags.None)
{
uavFlag = UnorderedAccessViewBufferFlags.None;
}
if (flags == StructuredBufferFlags.Append)
{
uavFlag = UnorderedAccessViewBufferFlags.Append;
}
if (flags == StructuredBufferFlags.Counter)
{
uavFlag = UnorderedAccessViewBufferFlags.Counter;
}
// create UAV :
var uavDesc = new UnorderedAccessViewDescription {
Format = DXGI.Format.Unknown,
Dimension = UnorderedAccessViewDimension.Buffer,
Buffer = new UnorderedAccessViewDescription.BufferResource {
ElementCount = structureCount,
FirstElement = 0,
Flags = uavFlag
}
};
uav = new UnorderedAccessView(device.Device, BufferGPU, uavDesc);
// create SRV :
var srvDesc = new ShaderResourceViewDescription {
Format = DXGI.Format.Unknown,
Buffer = { ElementCount = structureCount, FirstElement = 0 },
Dimension = ShaderResourceViewDimension.Buffer
};
SRV = new ShaderResourceView(device.Device, BufferGPU, srvDesc);
}
/// <summary>
///
/// </summary>
/// <param name="rs"></param>
/// <param name="elementCount"></param>
/// <param name="elementType"></param>
public StructuredBuffer(GraphicsDevice device, int structureStride, int structureCount, StructuredBufferFlags flags) : base(device)
{
Create(device, structureStride, structureCount, flags);
}
/// <summary>
///
/// </summary>
/// <param name="rs"></param>
/// <param name="elementCount"></param>
/// <param name="elementType"></param>
public StructuredBuffer(GraphicsDevice device, Type structureType, int structureCount, StructuredBufferFlags flags) : base(device)
{
Create(device, Marshal.SizeOf(structureType), structureCount, flags);
}
/// <summary>
///
/// </summary>
/// <param name="rs"></param>
/// <param name="elementCount"></param>
/// <param name="elementType"></param>
public FormattedBuffer(GraphicsDevice device, VertexFormat format, int elementsCount, StructuredBufferFlags flags) : base(device)
{
Create(device, format, elementsCount, flags);
}
