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@@ -2126,3 +2126,65 @@ mObjectCB->CopyData(0, objConstants);
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vout.PosH = mul(float4(vin.PosL, 1.0f), gWorldViewProj);
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```
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+更新完数据之后，就需要根据已有数据进行渲染
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+
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+```cpp
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+void D3DBox::Draw(const GameTimer& gt)
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+{
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+ // 重设命令
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+ ThrowIfFailed(mCommandAllocator->Reset());
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+
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+ ThrowIfFailed(mCommandList->Reset(mCommandAllocator.Get(), mPSO.Get()));
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+
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+ // 设置视口和窗口大小 RS 表示 Rasterizer Stage 光栅化阶段
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+ mCommandList->RSSetViewports(1, &mScreenViewport);
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+ mCommandList->RSSetScissorRects(1, &mScissorRect);
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+
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+ // 设置 Buffer 为可以写入 RenderTarget
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+ mCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(), D3D12_RESOURCE_STATE_PRESENT, D3D12_RESOURCE_STATE_RENDER_TARGET));
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+
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+ // 清空 RTV
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+ mCommandList->ClearRenderTargetView(CurrentBackBufferView(), Colors::LightSteelBlue, 0, nullptr);
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+ // 清空 DSV
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+ mCommandList->ClearDepthStencilView(DepthStencilView(), D3D12_CLEAR_FLAG_DEPTH | D3D12_CLEAR_FLAG_STENCIL, 1.0f, 0, 0, nullptr);
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+
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+ // 设置 RT
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+ mCommandList->OMSetRenderTargets(1, &CurrentBackBufferView(), true, &DepthStencilView());
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+
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+ // 设置描述符堆
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+ ID3D12DescriptorHeap* descriptorHeaps[] = { mCbvHeap.Get() };
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+ mCommandList->SetDescriptorHeaps(_countof(descriptorHeaps), descriptorHeaps);
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+
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+ // 设置根标签
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+ mCommandList->SetGraphicsRootSignature(mRootSignature.Get());
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+
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+ // 设置顶点、顶点索引、绘制图形
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+ mCommandList->IASetVertexBuffers(0, 1, &mBoxGeo->VertexBufferView());
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+ mCommandList->IASetIndexBuffer(&mBoxGeo->IndexBufferView());
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+ mCommandList->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST);
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+
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+ // 设置常量缓冲区到根标签表中的第0个
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+ mCommandList->SetGraphicsRootDescriptorTable(0, mCbvHeap->GetGPUDescriptorHandleForHeapStart());
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+
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+ // 绘制 Box
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+ mCommandList->DrawIndexedInstanced(mBoxGeo->DrawArgs["box"].IndexCount, 1, 0, 0, 0);
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+
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+ // 重新设置 Buffer 状态
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+ mCommandList->ResourceBarrier(1, &CD3DX12_RESOURCE_BARRIER::Transition(CurrentBackBuffer(), D3D12_RESOURCE_STATE_RENDER_TARGET, D3D12_RESOURCE_STATE_PRESENT));
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+
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+ // 关闭命令
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+ ThrowIfFailed(mCommandList->Close());
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+
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+ // 执行命令
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+ ID3D12CommandList* cmdsLists[] = { mCommandList.Get() };
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+ mCommandQueue->ExecuteCommandLists(_countof(cmdsLists), cmdsLists);
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+
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+ // 将缓冲区显示到屏幕上
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+ ThrowIfFailed(mSwapChain->Present(0, 0));
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+ // 重新设置后台缓冲区序号，因为当前缓冲区已经由于显示了，所以得换一个缓冲区
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+ mCurrentBackBuffer = (mCurrentBackBuffer + 1) % SwapChainBufferCount;
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+
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+ // 等待命令执行完毕
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+ FlushCommandQueue();
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+}
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+```
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nicetry12138