hellovr sample

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相对于 opengl 的保存到FBO里面 dx11 里面需要用到 Render To Texture--RTT

渲染到纹理，顾名思义就是把渲染目标从帧缓存变成一个纹理。

这样就可以把一个场景渲染后在进行Post Process，做出现在流行的各种特效。

另外在利用GPU做通用计算的时候程序也是通过RTT和GPU交换数据的。

一般情况下需要用以下方式来创建render target ，target对于的 pbackbuffer 就是对应着屏幕上渲染的部分

HRESULT result;// CREATE RENDER TARGET VIEWresult = pSwapChain->GetBuffer(NULL, __uuidof(ID3D11Texture2D), reinterpret_cast<void**>(&pBackBufferTex));if (FAILED(result)){return false;}D3D11_TEXTURE2D_DESC BBDesc;ZeroMemory(&BBDesc, sizeof(D3D11_TEXTURE2D_DESC));pBackBufferTex->GetDesc(&BBDesc);D3D11_RENDER_TARGET_VIEW_DESC RTVDesc;ZeroMemory(&RTVDesc, sizeof(D3D11_RENDER_TARGET_VIEW_DESC));RTVDesc.Format = BBDesc.Format;RTVDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;//RTVDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2DMS;RTVDesc.Texture2D.MipSlice = 0;result = pDevice->CreateRenderTargetView(pBackBufferTex, &RTVDesc, &pRenderTargetView);if (FAILED(result)){MyDebug(_T("ERROR"));}Memory::SafeRelease(pBackBufferTex);

在vr模式里面，就需要代替这里的render target 使用以下代码新建一个 target 对应的纹理然后把纹理和target view 绑定到一起就可以

D3D11_TEXTURE2D_DESC textureDesc;HRESULT result;D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDesc;D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;// Initialize the render target texture description.ZeroMemory(&textureDesc, sizeof(textureDesc));// Setup the render target texture description.textureDesc.Width = textureWidth;textureDesc.Height = textureHeight;textureDesc.MipLevels = 1;textureDesc.ArraySize = 1;textureDesc.Format = DXGI_FORMAT_R32G32B32A32_FLOAT;textureDesc.SampleDesc.Count = 1;textureDesc.Usage = D3D11_USAGE_DEFAULT;textureDesc.BindFlags = D3D11_BIND_RENDER_TARGET | D3D11_BIND_SHADER_RESOURCE;textureDesc.CPUAccessFlags = 0;    textureDesc.MiscFlags = 0;// Create the render target texture.result = device->CreateTexture2D(&textureDesc, NULL, &m_renderTargetTexture);if(FAILED(result)){return false;}// Setup the description of the render target view.renderTargetViewDesc.Format = textureDesc.Format;renderTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;renderTargetViewDesc.Texture2D.MipSlice = 0;// Create the render target view.result = device->CreateRenderTargetView(m_renderTargetTexture, &renderTargetViewDesc, &m_renderTargetView);if(FAILED(result)){return false;}

其他的在绘制时注意切换 target view 模式就行

deviceContext->OMSetRenderTargets(1, &m_renderTargetView, depthStencilView);

dx11 版本的vive 的hellovr 实现

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render to texture 事例代码

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