> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# BeginQuery

> Inicia la ejecución de una consulta. (ID3D12GraphicsCommandList.BeginQuery)

Inicia la ejecución de una consulta.

## Sintaxis

```cpp theme={null}
void BeginQuery(
    ID3D12QueryHeap  pQueryHeap,
    D3D12_QUERY_TYPE Type,
    UINT Index
)
```

### Parámetros

*pQueryHeap \[in]*\
Tipo: ID3D12QueryHeap \*

Especifica el [ID3D12QueryHeap](/reference/graphics/d3d12/interfaces/id3d12queryheap/id3d12queryheap_public) que contiene la consulta.

*Type \[in]*\
Tipo: D3D12\_QUERY\_TYPE

Especifica un miembro de [D3D12\_QUERY\_TYPE](/reference/graphics/d3d12_x/enums/d3d12_query_type).

*Index \[in]*\
Tipo: UINT

Especifica el índice de la consulta dentro del montón de consultas.

### Valor devuelto

Tipo: void

Ninguno.

## Comentarios

Consulte [Consultas](https://learn.microsoft.com/en-us/windows/desktop/direct3d12/queries) para obtener más información sobre las consultas de D3D12.

#### Ejemplos

El ejemplo [D3D12PredicationQueries](https://learn.microsoft.com/en-us/windows/desktop/direct3d12/working-samples) usa
**ID3D12GraphicsCommandList::BeginQuery** de la siguiente manera:

```cpp theme={null}
// Fill the command list with all the render commands and dependent state.
void D3D12PredicationQueries::PopulateCommandList()
{
// Command list allocators can only be reset when the associated
// command lists have finished execution on the GPU; apps should use
// fences to determine GPU execution progress.
ThrowIfFailed(m_commandAllocators[m_frameIndex]->Reset());

// However, when ExecuteCommandList() is called on a particular command
// list, that command list can then be reset at any time and must be before
// re-recording.
ThrowIfFailed(m_commandList->Reset(m_commandAllocators[m_frameIndex].Get(), m_pipelineState.Get()));

// Set necessary state.
m_commandList->SetGraphicsRootSignature(m_rootSignature.Get());

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

m_commandList->RSSetViewports(1, &m_viewport);
m_commandList->RSSetScissorRects(1, &m_scissorRect);

// Indicate that the back buffer will be used as a render target.
m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_renderTargets[m_frameIndex].Get(), D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));

CD3DX12_CPU_DESCRIPTOR_HANDLE rtvHandle(m_rtvHeap->GetCPUDescriptorHandleForHeapStart(), m_frameIndex, m_rtvDescriptorSize);
CD3DX12_CPU_DESCRIPTOR_HANDLE dsvHandle(m_dsvHeap->GetCPUDescriptorHandleForHeapStart());
m_commandList->OMSetRenderTargets(1, &rtvHandle, FALSE, &dsvHandle);

// Record commands.
const float clearColor[] = { 0.0f, 0.2f, 0.4f, 1.0f };
m_commandList->ClearRenderTargetView(rtvHandle, clearColor, 0, nullptr);
m_commandList->ClearDepthStencilView(dsvHandle, D3D12_CLEAR_FLAG_DEPTH, 1.0f, 0, 0, nullptr);

// Draw the quads and perform the occlusion query.
{
CD3DX12_GPU_DESCRIPTOR_HANDLE cbvFarQuad(m_cbvHeap->GetGPUDescriptorHandleForHeapStart(), m_frameIndex * CbvCountPerFrame, m_cbvSrvDescriptorSize);
CD3DX12_GPU_DESCRIPTOR_HANDLE cbvNearQuad(cbvFarQuad, m_cbvSrvDescriptorSize);

m_commandList->IASetPrimitiveTopology(D3D_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP);
m_commandList->IASetVertexBuffers(0, 1, &m_vertexBufferView);

// Draw the far quad conditionally based on the result of the occlusion query
// from the previous frame.
m_commandList->SetGraphicsRootDescriptorTable(0, cbvFarQuad);
m_commandList->SetPredication(m_queryResult.Get(), 0, D3D12_PREDICATION_OP_EQUAL_ZERO);
m_commandList->DrawInstanced(4, 1, 0, 0);

// Disable predication and always draw the near quad.
m_commandList->SetPredication(nullptr, 0, D3D12_PREDICATION_OP_EQUAL_ZERO);
m_commandList->SetGraphicsRootDescriptorTable(0, cbvNearQuad);
m_commandList->DrawInstanced(4, 1, 4, 0);

// Run the occlusion query with the bounding box quad.
m_commandList->SetGraphicsRootDescriptorTable(0, cbvFarQuad);
m_commandList->SetPipelineState(m_queryState.Get());
m_commandList->BeginQuery(m_queryHeap.Get(), D3D12_QUERY_TYPE_BINARY_OCCLUSION, 0);
m_commandList->DrawInstanced(4, 1, 8, 0);
m_commandList->EndQuery(m_queryHeap.Get(), D3D12_QUERY_TYPE_BINARY_OCCLUSION, 0);

// Resolve the occlusion query and store the results in the query result buffer
// to be used on the subsequent frame.
m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_queryResult.Get(), D3D12_RESOURCE_STATE_PREDICATION, D3D12_RESOURCE_STATE_COPY_DEST));
m_commandList->ResolveQueryData(m_queryHeap.Get(), D3D12_QUERY_TYPE_BINARY_OCCLUSION, 0, 1, m_queryResult.Get(), 0);
m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_queryResult.Get(), D3D12_RESOURCE_STATE_COPY_DEST, D3D12_RESOURCE_STATE_PREDICATION));
}

// Indicate that the back buffer will now be used to present.
m_commandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(m_renderTargets[m_frameIndex].Get(), D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));

ThrowIfFailed(m_commandList->Close());
}

```

Consulte el [código de ejemplo en la referencia de D3D12](https://learn.microsoft.com/en-us/windows/desktop/direct3d12/notes-on-example-code).

<div class="code" />

## Requisitos

**Encabezado:** d3d12\_xs.h o d3d12\_x.h\
**Biblioteca:** d3d12\_xs.lib o d3d12\_x.lib\
**Plataformas compatibles**: consolas XBOX Series y familia XBOX One

## Consulte también

[ID3D12GraphicsCommandList](/reference/graphics/d3d12_xs/interfaces/ID3D12GraphicsCommandList/id3d12graphicscommandlist_xs)


## Related topics

- [D3D12_QUERY_DATA_PIPELINE_STATISTICS](/es/reference/graphics/d3d12/structs/d3d12_query_data_pipeline_statistics_public.md)
- [XAsyncBegin](/es/reference/system/xasyncprovider/functions/xasyncbegin.md)
- [Función PIXBeginEvent](/es/reference/tools/pix3/functions/pixbeginevent.md)
- [PIXBeginRetailEvent](/es/reference/tools/pix3/functions/pixbeginretailevent_2.md)
- [Referencia de PIXBeginEvent](/es/reference/tools/pix3/functions/pixbeginevent_3.md)