void resize(int capacity)
{
if (maximumCapacity > 0 && capacity > maximumCapacity)
{
throw new ArgumentException("Attempting to resize a dynamic buffer over it’s maximum capacity");
}
BufferDesc desc = new BufferDesc(false);
desc.Usage = Usage.Dynamic;
desc.BindFlags = usage;
desc.CPUAccessFlags = CpuAccessFlags.Write;
desc.uiSizeInBytes = capacity;
if (usage.HasFlag(BindFlags.ShaderResource))
{
desc.Mode = BufferMode.Structured;
desc.ElementByteStride = 16;
}
using (var device = context.renderContext.device)
buffer = device.CreateBuffer(ref desc, null, IntPtr.Zero, 0);
this.capacity = capacity;
if (null != m_resizedEvent)
{
foreach (var sub in m_resizedEvent)
{
sub(this, capacity);
}
}
}
/// <summary>Create buffer with initial content from the specified structure</summary>
public static IBuffer CreateBuffer <T>(this IRenderDevice device, BufferDesc desc, ref T data, string name = null) where T : unmanaged
{
unsafe
{
fixed(T *pointer = &data)
return(device.CreateBuffer(ref desc, name, (IntPtr)pointer, Marshal.SizeOf <T>()));
}
}
/// <summary>Create dynamic buffer for shader constants</summary>
public static IBuffer CreateDynamicUniformBuffer(this IRenderDevice device, int cb, string name = null)
{
BufferDesc CBDesc = new BufferDesc(false);
CBDesc.uiSizeInBytes = cb;
CBDesc.Usage = Usage.Dynamic;
CBDesc.BindFlags = BindFlags.UniformBuffer;
CBDesc.CPUAccessFlags = CpuAccessFlags.Write;
return(device.CreateBuffer(CBDesc, name));
}
/// <summary>Create buffer with initial content from a span</summary>
public static IBuffer CreateBuffer <T>(this IRenderDevice device, BufferDesc desc, ReadOnlySpan <T> data, string name = null) where T : unmanaged
{
if (null == data || data.Length <= 0)
{
return(device.CreateBuffer(ref desc, name, IntPtr.Zero, 0));
}
unsafe
{
int cb = Marshal.SizeOf <T>() * data.Length;
fixed(T *pointer = data)
return(device.CreateBuffer(ref desc, name, (IntPtr)pointer, cb));
}
}
/// <summary>Create immutable buffer for shader constants.</summary>
public static IBuffer CreateImmutableUniformBuffer <T>(this IRenderDevice device, ref T data, string name = null) where T : unmanaged
{
int cb = Marshal.SizeOf <T>();
if (0 != cb % 16)
{
throw new ArgumentException($"Constant buffer size must be a multiple of 16 bytes, yet sizeof( { typeof( T ).FullName } ) = { cb }");
}
BufferDesc desc = new BufferDesc(false)
{
uiSizeInBytes = cb,
BindFlags = BindFlags.UniformBuffer,
Usage = Usage.Static,
};
return(device.CreateBuffer(desc, ref data, name));
}
/// <summary>Create a buffer without initial data</summary>
public static IBuffer CreateBuffer(this IRenderDevice device, BufferDesc desc, string name = null)
{
return(device.CreateBuffer(ref desc, name, IntPtr.Zero, 0));
}