Dispatch

void Dispatch(
    UINT ThreadGroupCountX,
    UINT ThreadGroupCountY,
    UINT ThreadGroupCountZ
)

// Run the particle simulation using the compute shader.
void D3D12nBodyGravity::Simulate(UINT threadIndex)
{
ID3D12GraphicsCommandList* pCommandList = m_computeCommandList[threadIndex].Get();

UINT srvIndex;
UINT uavIndex;
ID3D12Resource *pUavResource;
if (m_srvIndex[threadIndex] == 0)
{
srvIndex = SrvParticlePosVelo0;
uavIndex = UavParticlePosVelo1;
pUavResource = m_particleBuffer1[threadIndex].Get();
}
else
{
srvIndex = SrvParticlePosVelo1;
uavIndex = UavParticlePosVelo0;
pUavResource = m_particleBuffer0[threadIndex].Get();
}

pCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(pUavResource, D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE, D3D12_RESOURCE_STATE_UNORDERED_ACCESS));

pCommandList->SetPipelineState(m_computeState.Get());
pCommandList->SetComputeRootSignature(m_computeRootSignature.Get());

ID3D12DescriptorHeap* ppHeaps[] = { m_srvUavHeap.Get() };
pCommandList->SetDescriptorHeaps(_countof(ppHeaps), ppHeaps);

CD3DX12_GPU_DESCRIPTOR_HANDLE srvHandle(m_srvUavHeap->GetGPUDescriptorHandleForHeapStart(), srvIndex + threadIndex, m_srvUavDescriptorSize);
CD3DX12_GPU_DESCRIPTOR_HANDLE uavHandle(m_srvUavHeap->GetGPUDescriptorHandleForHeapStart(), uavIndex + threadIndex, m_srvUavDescriptorSize);

pCommandList->SetComputeRootConstantBufferView(RootParameterCB, m_constantBufferCS->GetGPUVirtualAddress());
pCommandList->SetComputeRootDescriptorTable(RootParameterSRV, srvHandle);
pCommandList->SetComputeRootDescriptorTable(RootParameterUAV, uavHandle);

pCommandList->Dispatch(static_cast<int>(ceil(ParticleCount / 128.0f)), 1, 1);

pCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(pUavResource, D3D12_RESOURCE_STATE_UNORDERED_ACCESS, D3D12_RESOURCE_STATE_NON_PIXEL_SHADER_RESOURCE));
}