hellovr sample

相對於 opengl 的保存到FBO裏面 dx11 裏面需要用到 Render To Texture--RTT

渲染到紋理，顧名思義就是把渲染目標從幀緩存變成一個紋理。

這樣就可以把一個場景渲染後在進行Post Process，做出現在流行的各種特效。

另外在利用GPU做通用計算的時候程序也是通過RTT和GPU交換數據的。

一般情況下需要用以下方式來創建render target ，target對於的 pbackbuffer 就是對應着屏幕上渲染的部分

	HRESULT result;
	// CREATE RENDER TARGET VIEW
	result = 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模式裏面，就需要代替這裏的render target 使用以下代碼 新建一個 target 對應的紋理 然後把紋理和target view 綁定到一起就可以

	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;
	}

其他的在繪製時注意切換 target view 模式就行

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

dx11 版本的vive 的hellovr 實現

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render to texture 事例代碼  

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