static void Main(string[] args)
{
const int elementCount = 16;
const int bufferSizeInBytes = elementCount * sizeof(float);
D3D.Device device = new D3D.Device(D3D.DriverType.Hardware, D3D.DeviceCreationFlags.Debug);
// The input to the computation will be a constant buffer containing
// integers (in floating point representation) from 1 to numberOfElements,
// inclusive. The compute shader itself will double these values and write
// them to the output buffer.
D3D.BufferDescription inputBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.ConstantBuffer,
CpuAccessFlags = D3D.CpuAccessFlags.Write,
OptionFlags = D3D.ResourceOptionFlags.None,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Dynamic,
};
D3D.Buffer inputBuffer = new D3D.Buffer(device, inputBufferDescription);
DataBox input = device.ImmediateContext.MapSubresource(inputBuffer, 0, bufferSizeInBytes, D3D.MapMode.WriteDiscard, D3D.MapFlags.None);
for (int value = 1; value <= elementCount; ++value)
input.Data.Write((float)value);
device.ImmediateContext.UnmapSubresource(inputBuffer, 0);
// A staging buffer is used to copy data between the CPU and GPU; the output
// buffer (which gets the computation results) cannot be mapped directly.
D3D.BufferDescription stagingBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.None,
CpuAccessFlags = D3D.CpuAccessFlags.Read,
OptionFlags = D3D.ResourceOptionFlags.StructuredBuffer,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Staging,
};
D3D.Buffer stagingBuffer = new D3D.Buffer(device, stagingBufferDescription);
// The output buffer itself, and the view required to bind it to the pipeline.
D3D.BufferDescription outputBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.UnorderedAccess | D3D.BindFlags.ShaderResource,
OptionFlags = D3D.ResourceOptionFlags.StructuredBuffer,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Default,
};
D3D.Buffer outputBuffer = new D3D.Buffer(device, outputBufferDescription);
D3D.UnorderedAccessViewDescription outputViewDescription = new D3D.UnorderedAccessViewDescription
{
ElementCount = elementCount,
Format = DXGI.Format.Unknown,
Dimension = D3D.UnorderedAccessViewDimension.Buffer
};
D3D.UnorderedAccessView outputView = new D3D.UnorderedAccessView(device, outputBuffer, outputViewDescription);
// Compile the shader.
ShaderBytecode computeShaderCode = ShaderBytecode.CompileFromFile("BasicComputeShader.hlsl", "main", "cs_4_0", ShaderFlags.None, EffectFlags.None);
D3D.ComputeShader computeShader = new D3D.ComputeShader(device, computeShaderCode);
device.ImmediateContext.ComputeShader.Set(computeShader);
device.ImmediateContext.ComputeShader.SetUnorderedAccessView(outputView, 0);
device.ImmediateContext.ComputeShader.SetConstantBuffer(inputBuffer, 0);
// Compute shaders execute on multiple threads at the same time. Those execution
// threads are grouped; Dispatch() indicates how many groups in the X, Y and Z
// dimension will be utilized. The shader itself specified how many threads per
// group (also in X, Y and Z dimensions) to use via the [numthreads] attribute.
// In this sample, one thread group will be used with 16 threads, each thread
// will process one element of the input data.
device.ImmediateContext.Dispatch(1, 1, 1);
device.ImmediateContext.CopyResource(outputBuffer, stagingBuffer);
DataBox output = device.ImmediateContext.MapSubresource(stagingBuffer, 0, sizeof(float) * elementCount, D3D.MapMode.Read, D3D.MapFlags.None);
Console.Write("Results:");
for (int index = 0; index < elementCount; ++index)
Console.Write(" {0}", output.Data.Read<float>());
device.ImmediateContext.UnmapSubresource(outputBuffer, 0);
Console.WriteLine();
computeShader.Dispose();
outputView.Dispose();
outputBuffer.Dispose();
stagingBuffer.Dispose();
inputBuffer.Dispose();
device.Dispose();
}
static void Main(string[] args)
{
const int elementCount = 16;
const int bufferSizeInBytes = elementCount * sizeof(float);
D3D.Device device = new D3D.Device(D3D.DriverType.Hardware, D3D.DeviceCreationFlags.Debug);
// The input to the computation will be a constant buffer containing
// integers (in floating point representation) from 1 to numberOfElements,
// inclusive. The compute shader itself will double these values and write
// them to the output buffer.
D3D.BufferDescription inputBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.ConstantBuffer,
CpuAccessFlags = D3D.CpuAccessFlags.Write,
OptionFlags = D3D.ResourceOptionFlags.None,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Dynamic,
};
D3D.Buffer inputBuffer = new D3D.Buffer(device, inputBufferDescription);
DataBox input = device.ImmediateContext.MapSubresource(inputBuffer, D3D.MapMode.WriteDiscard, D3D.MapFlags.None);
for (int value = 1; value <= elementCount; ++value)
{
input.Data.Write((float)value);
}
device.ImmediateContext.UnmapSubresource(inputBuffer, 0);
// A staging buffer is used to copy data between the CPU and GPU; the output
// buffer (which gets the computation results) cannot be mapped directly.
D3D.BufferDescription stagingBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.None,
CpuAccessFlags = D3D.CpuAccessFlags.Read,
OptionFlags = D3D.ResourceOptionFlags.StructuredBuffer,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Staging,
};
D3D.Buffer stagingBuffer = new D3D.Buffer(device, stagingBufferDescription);
// The output buffer itself, and the view required to bind it to the pipeline.
D3D.BufferDescription outputBufferDescription = new D3D.BufferDescription
{
BindFlags = D3D.BindFlags.UnorderedAccess | D3D.BindFlags.ShaderResource,
OptionFlags = D3D.ResourceOptionFlags.StructuredBuffer,
SizeInBytes = bufferSizeInBytes,
StructureByteStride = sizeof(float),
Usage = D3D.ResourceUsage.Default,
};
D3D.Buffer outputBuffer = new D3D.Buffer(device, outputBufferDescription);
D3D.UnorderedAccessViewDescription outputViewDescription = new D3D.UnorderedAccessViewDescription
{
ElementCount = elementCount,
Format = DXGI.Format.Unknown,
Dimension = D3D.UnorderedAccessViewDimension.Buffer
};
D3D.UnorderedAccessView outputView = new D3D.UnorderedAccessView(device, outputBuffer, outputViewDescription);
// Compile the shader.
ShaderBytecode computeShaderCode = ShaderBytecode.CompileFromFile("BasicComputeShader.hlsl", "main", "cs_4_0", ShaderFlags.None, EffectFlags.None);
D3D.ComputeShader computeShader = new D3D.ComputeShader(device, computeShaderCode);
device.ImmediateContext.ComputeShader.Set(computeShader);
device.ImmediateContext.ComputeShader.SetUnorderedAccessView(outputView, 0);
device.ImmediateContext.ComputeShader.SetConstantBuffer(inputBuffer, 0);
// Compute shaders execute on multiple threads at the same time. Those execution
// threads are grouped; Dispatch() indicates how many groups in the X, Y and Z
// dimension will be utilized. The shader itself specified how many threads per
// group (also in X, Y and Z dimensions) to use via the [numthreads] attribute.
// In this sample, one thread group will be used with 16 threads, each thread
// will process one element of the input data.
device.ImmediateContext.Dispatch(1, 1, 1);
device.ImmediateContext.CopyResource(outputBuffer, stagingBuffer);
DataBox output = device.ImmediateContext.MapSubresource(stagingBuffer, D3D.MapMode.Read, D3D.MapFlags.None);
Console.Write("Results:");
for (int index = 0; index < elementCount; ++index)
{
Console.Write(" {0}", output.Data.Read <float>());
}
device.ImmediateContext.UnmapSubresource(outputBuffer, 0);
Console.WriteLine();
computeShader.Dispose();
outputView.Dispose();
outputBuffer.Dispose();
stagingBuffer.Dispose();
inputBuffer.Dispose();
device.Dispose();
}
