/// <summary>
/// Creates a new directly-bound descriptor root parameter
/// </summary>
/// <param name="type">The type of the descriptor to bind. This must either be <see cref="RootParameterType.ConstantBufferView"/>,
/// <see cref="RootParameterType.ShaderResourceView"/>, or <see cref="RootParameterType.UnorderedAccessView"/></param>
/// <param name="shaderRegister">The shader register to bind this parameter to</param>
/// <param name="registerSpace">The space to bind this parameter in</param>
/// <param name="visibility">Indicates which shaders have access to this parameter</param>
/// <returns>A new <see cref="RootParameter"/> representing a directly-bound descriptor</returns>
public static RootParameter CreateDescriptor(RootParameterType type, uint shaderRegister, uint registerSpace, ShaderVisibility visibility = ShaderVisibility.All)
{
Debug.Assert(type is RootParameterType.ConstantBufferView or RootParameterType.ShaderResourceView or RootParameterType.UnorderedAccessView);
return(new RootParameter(type, new D3D12_ROOT_DESCRIPTOR1 {
ShaderRegister = shaderRegister, RegisterSpace = registerSpace
}, visibility));
}
private RootParameter(D3D12_ROOT_CONSTANTS constants, ShaderVisibility visibility)
{
Type = RootParameterType.DwordConstants;
Visibility = visibility;
DescriptorTable = default;
Descriptor = default;
Constants = constants;
}
private RootParameter(RootParameterType type, D3D12_ROOT_DESCRIPTOR1 descriptor, ShaderVisibility visibility)
{
Type = type;
Visibility = visibility;
DescriptorTable = default;
Descriptor = descriptor;
Constants = default;
}
private RootParameter(D3D12_DESCRIPTOR_RANGE1[] descriptorTable, ShaderVisibility visibility)
{
Type = RootParameterType.DescriptorTable;
Visibility = visibility;
DescriptorTable = descriptorTable;
Descriptor = default;
Constants = default;
}
/// <summary>
/// Initializes a new instance of the <see cref="RootParameter"/> struct.
/// </summary>
/// <param name="rootDescriptor">The root descriptor.</param>
/// <param name="type">The type.</param>
/// <param name="visibility">The visibility.</param>
/// <exception cref="System.ArgumentException">type</exception>
public RootParameter1(ShaderVisibility visibility, RootDescriptor1 rootDescriptor, RootParameterType type)
: this()
{
if(type == RootParameterType.Constant32Bits || type == RootParameterType.DescriptorTable)
{
throw new ArgumentException(string.Format("Cannot this type [{0}] for a RootDescriptor", type), "type");
}
native.ParameterType = type;
Descriptor = rootDescriptor;
ShaderVisibility = visibility;
}
public static string GetRegisterName(this RootParameterType type)
{
switch (type)
{
case RootParameterType._32BitConstants:
case RootParameterType.Cbv:
return("b");
case RootParameterType.Srv:
return("t");
case RootParameterType.Uav:
return("u");
default:
throw new InvalidOperationException($"Register name not supported for Root Parameter Type {type}");
}
}
public RootParameter(RootParameterType parameterType, RootDescriptor rootDescriptor, ShaderVisibility visibility)
{
NativeRootParameter = new RootParameter1((Vortice.Direct3D12.RootParameterType)parameterType, Unsafe.As <RootDescriptor, RootDescriptor1>(ref rootDescriptor), (Vortice.Direct3D12.ShaderVisibility)visibility);
}
/// <summary>
/// Initializes a new instance of the <see cref="RootParameter"/> struct.
/// </summary>
/// <param name="rootDescriptor">The root descriptor.</param>
/// <param name="type">The type.</param>
/// <param name="visibility">The visibility.</param>
/// <exception cref="System.ArgumentException">type</exception>
public RootParameter1(ShaderVisibility visibility, RootDescriptor1 rootDescriptor, RootParameterType type)
: this()
{
if (type == RootParameterType.Constant32Bits || type == RootParameterType.DescriptorTable)
{
throw new ArgumentException(string.Format("Cannot this type [{0}] for a RootDescriptor", type), "type");
}
native.ParameterType = type;
Descriptor = rootDescriptor;
ShaderVisibility = visibility;
}
