ID3D12QueryHeap interface (d3d12.h)
Manages a query heap. A query heap holds an array of queries, referenced by indexes.
Inheritance
The ID3D12QueryHeap interface inherits from the ID3D12Pageable interface.
Remarks
For more information, refer to Queries.
Examples
The D3D12PredicationQueries sample uses ID3D12QueryHeap as follows:
Create a query heap and a query result buffer.
// Pipeline objects.
D3D12_VIEWPORT m_viewport;
D3D12_RECT m_scissorRect;
ComPtr<IDXGISwapChain3> m_swapChain;
ComPtr<ID3D12Device> m_device;
ComPtr<ID3D12Resource> m_renderTargets[FrameCount];
ComPtr<ID3D12CommandAllocator> m_commandAllocators[FrameCount];
ComPtr<ID3D12CommandQueue> m_commandQueue;
ComPtr<ID3D12RootSignature> m_rootSignature;
ComPtr<ID3D12DescriptorHeap> m_rtvHeap;
ComPtr<ID3D12DescriptorHeap> m_cbvHeap;
ComPtr<ID3D12DescriptorHeap> m_dsvHeap;
ComPtr<ID3D12QueryHeap> m_queryHeap;
UINT m_rtvDescriptorSize;
UINT m_cbvSrvDescriptorSize;
UINT m_frameIndex;
// Synchronization objects.
ComPtr<ID3D12Fence> m_fence;
UINT64 m_fenceValues[FrameCount];
HANDLE m_fenceEvent;
// Asset objects.
ComPtr<ID3D12PipelineState> m_pipelineState;
ComPtr<ID3D12PipelineState> m_queryState;
ComPtr<ID3D12GraphicsCommandList> m_commandList;
ComPtr<ID3D12Resource> m_vertexBuffer;
ComPtr<ID3D12Resource> m_constantBuffer;
ComPtr<ID3D12Resource> m_depthStencil;
ComPtr<ID3D12Resource> m_queryResult;
D3D12_VERTEX_BUFFER_VIEW m_vertexBufferView;
// Describe and create a heap for occlusion queries.
D3D12_QUERY_HEAP_DESC queryHeapDesc = {};
queryHeapDesc.Count = 1;
queryHeapDesc.Type = D3D12_QUERY_HEAP_TYPE_OCCLUSION;
ThrowIfFailed(m_device->CreateQueryHeap(&queryHeapDesc, IID_PPV_ARGS(&m_queryHeap)));
Refer to the Example Code in the D3D12 Reference.
Requirements
| Requirement | Value |
|---|---|
| Target Platform | Windows |
| Header | d3d12.h |