/// <summary>
/// Executes the shader. First, the input value is set into the input registers.
/// Then the shader is executed. Finally, the output value is extracted from
/// the output registers.
/// </summary>
/// <typeparam name="TInput">Input type. This must be a struct whose byte count
/// exactly matches the shader input.</typeparam>
/// <typeparam name="TOutput">Output type. This must be a struct whose byte count
/// exactly matches the shader output.</typeparam>
/// <param name="input">Input to the shader.</param>
/// <returns>Shader output.</returns>
public TOutput Execute <TInput, TOutput>(TInput input)
where TInput : struct
where TOutput : struct
{
// Validate.
if (StructUtility.SizeOf <TInput>() != _inputSignatureSize)
{
throw new ArgumentException(string.Format("Expected input struct to be {0} bytes, but was {1}'",
_inputSignatureSize, StructUtility.SizeOf <TInput>()));
}
// Set input parameters into virtual machine registers. Use knowledge of byte size of each
// parameter to extract the right values from the input.
var inputBytes = StructUtility.ToBytes(input);
var inputByteIndex = 0;
for (int i = 0; i < _inputSignature.Parameters.Count; i++)
{
var inputParameter = _inputSignature.Parameters[i];
var registerBytes = new byte[Number4.SizeInBytes];
Array.Copy(inputBytes, inputByteIndex, registerBytes, 0, inputParameter.ByteCount);
_virtualMachine.SetInputRegisterValue(ContextIndex, 0, i, Number4.FromByteArray(registerBytes, 0));
inputByteIndex += inputParameter.ByteCount;
}
// Execute shader.
_virtualMachine.Execute();
// Get output parameters from virtual machine registers.
var outputBytes = new byte[_outputSignatureSize];
var outputByteIndex = 0;
for (var i = 0; i < _outputSignature.Parameters.Count; i++)
{
var outputParameter = _outputSignature.Parameters[i];
var registerBytes = _virtualMachine.GetOutputRegisterValue(ContextIndex, i).RawBytes;
Array.Copy(registerBytes, 0, outputBytes, outputByteIndex, outputParameter.ByteCount);
outputByteIndex += outputParameter.ByteCount;
}
return(StructUtility.FromBytes <TOutput>(outputBytes));
}
public static BasicHlsl.VertexShaderOutput ExecuteVertexShader(string compiledShaderFile,
BasicHlsl.ConstantBufferGlobals globals, VertexPositionNormalTexture vertex)
{
var device = new Device(DriverType.Warp);
var vertexShaderBytes = File.ReadAllBytes(compiledShaderFile);
var vertexShaderBytecode = new ShaderBytecode(vertexShaderBytes);
var vertexShader = new VertexShader(device, vertexShaderBytecode);
var layout = new InputLayout(device,
ShaderSignature.GetInputSignature(vertexShaderBytecode),
new[]
{
new InputElement("POSITION", 0, Format.R32G32B32A32_Float, 0, 0),
new InputElement("NORMAL", 0, Format.R32G32B32_Float, 16, 0),
new InputElement("TEXCOORD", 0, Format.R32G32_Float, 28, 0)
});
var vertices = Buffer.Create(device, BindFlags.VertexBuffer, new[] { vertex });
var constantBuffer = Buffer.Create(device, ref globals, new BufferDescription
{
BindFlags = BindFlags.ConstantBuffer,
CpuAccessFlags = CpuAccessFlags.None,
Usage = ResourceUsage.Default
});
var geometryShader = new GeometryShader(device, vertexShaderBytecode,
new[]
{
new StreamOutputElement {
SemanticName = "SV_POSITION", ComponentCount = 4
},
new StreamOutputElement {
SemanticName = "COLOR", ComponentCount = 4
},
new StreamOutputElement {
SemanticName = "TEXCOORD", ComponentCount = 2
}
},
BasicHlsl.VertexShaderOutput.SizeInBytes);
var outputBuffer = Buffer.Create(device, new BasicHlsl.VertexShaderOutput[1],
new BufferDescription
{
CpuAccessFlags = CpuAccessFlags.None,
BindFlags = BindFlags.StreamOutput,
Usage = ResourceUsage.Default
});
var stagingBuffer = Buffer.Create(device, new BasicHlsl.VertexShaderOutput[1],
new BufferDescription
{
CpuAccessFlags = CpuAccessFlags.Read,
BindFlags = BindFlags.None,
Usage = ResourceUsage.Staging
});
device.InputAssembler.InputLayout = layout;
device.InputAssembler.PrimitiveTopology = PrimitiveTopology.PointList;
device.InputAssembler.SetVertexBuffers(0, new VertexBufferBinding(vertices, VertexPositionNormalTexture.SizeInBytes, 0));
device.VertexShader.SetConstantBuffer(0, constantBuffer);
device.VertexShader.Set(vertexShader);
device.GeometryShader.Set(geometryShader);
device.StreamOutput.SetTargets(new StreamOutputBufferBinding(outputBuffer, 0));
device.Draw(1, 0);
device.CopyResource(outputBuffer, stagingBuffer);
device.Flush();
var stream = stagingBuffer.Map(MapMode.Read, SharpDX.Direct3D10.MapFlags.None);
var bytes = new byte[BasicHlsl.VertexShaderOutput.SizeInBytes];
stream.Read(bytes, 0, bytes.Length);
stream.Dispose();
outputBuffer.Dispose();
vertices.Dispose();
layout.Dispose();
geometryShader.Dispose();
vertexShader.Dispose();
vertexShaderBytecode.Dispose();
device.Dispose();
return(StructUtility.FromBytes <BasicHlsl.VertexShaderOutput>(bytes));
}
