/// <summary>
/// Function to retrieve the appropriate CPU flags for the buffer.
/// </summary>
/// <param name="usage">The intended usage for the buffer.</param>
/// <param name="binding">The binding flags being used by the buffer.</param>
/// <param name="useIndirectArgs"><b>true</b> if the buffer will contain indirect arguments, <b>false</b> if not.</param>
/// <returns>The D3D11 CPU access flags.</returns>
private D3D11.CpuAccessFlags GetCpuFlags(ResourceUsage usage, BufferBinding binding, bool useIndirectArgs)
{
D3D11.CpuAccessFlags result = D3D11.CpuAccessFlags.None;
if (useIndirectArgs)
{
return(result);
}
switch (usage)
{
case ResourceUsage.Dynamic:
result = D3D11.CpuAccessFlags.Write;
break;
case ResourceUsage.Staging:
// Staging resources are implicitly readable.
result = D3D11.CpuAccessFlags.Read | D3D11.CpuAccessFlags.Write;
break;
case ResourceUsage.Default:
if ((binding != BufferBinding.Shader) &&
(binding != BufferBinding.ReadWrite) &&
(binding != (BufferBinding.Shader | BufferBinding.ReadWrite)))
{
break;
}
result = _info.AllowCpuRead ? D3D11.CpuAccessFlags.Read : D3D11.CpuAccessFlags.None;
break;
}
return(result);
}
/// <summary>
/// Function to initialize the buffer data.
/// </summary>
/// <param name="initialData">The initial data used to populate the buffer.</param>
private void Initialize <T>(GorgonNativeBuffer <T> initialData)
where T : unmanaged
{
D3D11.CpuAccessFlags cpuFlags = GetCpuFlags(false, D3D11.BindFlags.IndexBuffer);
Log.Print($"{Name} Index Buffer: Creating D3D11 buffer. Size: {SizeInBytes} bytes", LoggingLevel.Simple);
GorgonVertexBuffer.ValidateBufferBindings(_info.Usage, 0);
D3D11.BindFlags bindFlags = D3D11.BindFlags.IndexBuffer;
if ((_info.Binding & VertexIndexBufferBinding.StreamOut) == VertexIndexBufferBinding.StreamOut)
{
bindFlags |= D3D11.BindFlags.StreamOutput;
}
if ((_info.Binding & VertexIndexBufferBinding.UnorderedAccess) == VertexIndexBufferBinding.UnorderedAccess)
{
bindFlags |= D3D11.BindFlags.UnorderedAccess;
}
var desc = new D3D11.BufferDescription
{
SizeInBytes = SizeInBytes,
Usage = (D3D11.ResourceUsage)_info.Usage,
BindFlags = bindFlags,
OptionFlags = D3D11.ResourceOptionFlags.None,
CpuAccessFlags = cpuFlags,
StructureByteStride = 0
};
if ((initialData != null) && (initialData.Length > 0))
{
unsafe
{
D3DResource = Native = new D3D11.Buffer(Graphics.D3DDevice, new IntPtr((void *)initialData), desc)
{
DebugName = Name
};
}
}
else
{
D3DResource = Native = new D3D11.Buffer(Graphics.D3DDevice, desc)
{
DebugName = Name
};
}
}
/// <summary>
/// Function to initialize the buffer data.
/// </summary>
/// <param name="initialData">The initial data used to populate the buffer.</param>
private void Initialize(GorgonNativeBuffer <byte> initialData)
{
// If the buffer is not aligned to 16 bytes, then pad the size.
_info.SizeInBytes = (_info.SizeInBytes + 15) & ~15;
TotalConstantCount = _info.SizeInBytes / (sizeof(float) * 4);
D3D11.CpuAccessFlags cpuFlags = GetCpuFlags(false, D3D11.BindFlags.ConstantBuffer);
Log.Print($"{Name} Constant Buffer: Creating D3D11 buffer. Size: {_info.SizeInBytes} bytes", LoggingLevel.Simple);
var desc = new D3D11.BufferDescription
{
SizeInBytes = _info.SizeInBytes,
Usage = (D3D11.ResourceUsage)_info.Usage,
BindFlags = D3D11.BindFlags.ConstantBuffer,
OptionFlags = D3D11.ResourceOptionFlags.None,
CpuAccessFlags = cpuFlags,
StructureByteStride = 0
};
if ((initialData != null) && (initialData.Length > 0))
{
unsafe
{
D3DResource = Native = new D3D11.Buffer(Graphics.D3DDevice, new IntPtr((void *)initialData), desc)
{
DebugName = Name
};
}
}
else
{
D3DResource = Native = new D3D11.Buffer(Graphics.D3DDevice, desc)
{
DebugName = Name
};
}
}