DirectX Render to Texture

Question

i am trying to render my Scene to a texture to use it in shaders for some post processing effect. I am not very experienced with this kind of stuff so i have some questions here.. First off all:

I am having this code in my OnCreateDevice() method:

    D3D11_TEXTURE2D_DESC textureDesc;
    D3D11_RENDER_TARGET_VIEW_DESC renderTargetViewDesc;
    D3D11_SHADER_RESOURCE_VIEW_DESC shaderResourceViewDesc;

    ZeroMemory(&textureDesc, sizeof(textureDesc));

    textureDesc.Width = 800/2;
    textureDesc.Height = 600/2;
    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;


    pd3dDevice->CreateTexture2D(&textureDesc, NULL, &renderTargetTextureMap);


    renderTargetViewDesc.Format = textureDesc.Format;
    renderTargetViewDesc.ViewDimension = D3D11_RTV_DIMENSION_TEXTURE2D;
    renderTargetViewDesc.Texture2D.MipSlice = 0;


    pd3dDevice->CreateRenderTargetView(renderTargetTextureMap, &renderTargetViewDesc, &renderTargetViewMap);

    shaderResourceViewDesc.Format = textureDesc.Format;
    shaderResourceViewDesc.ViewDimension = D3D11_SRV_DIMENSION_TEXTURE2D;
    shaderResourceViewDesc.Texture2D.MostDetailedMip = 0;
    shaderResourceViewDesc.Texture2D.MipLevels = 1;


    pd3dDevice->CreateShaderResourceView(renderTargetTextureMap, &shaderResourceViewDesc, &shaderResourceViewMap);

I am creating a texture, a renderView and a resourceView. But where do i go from here? Do i have to define another buffer or does this work after all?

Specifically,

So i think i know i have to set the OMRenderTargets with: renderTargetViewMap and depthStencilView. But where do i have to set this? In every frame render call? Before or after i rendered the other objects in my scene? and my guess would be that i have to make a new shader to which i give this texture created to work with it.

Thanks for any insight :/

Psychopathy

What have you tried? I'm sure there are MANY render to texture tutorials out there (google.com/…). What part, specifically are you looking for help with? – Dupaix

So i think i know i have to set the OMRenderTargets with: renderTargetViewMap and depthStencilView. But where do i have to set this? In every frame render call? Before or after i rendered the other objects in my scene? and my guess would be that i have to make a new shader to which i give this texture created to work with it. – Psychopathy

You will have to set it each time you want to render to the texture, yes (and as long as you haven't switched to another render target or the back buffer). Once you've rendered the data to the texture, set up the shader that processes this data and draw a screen aligned quad with this texture. – Dupaix

Thanks. I will try around a little bit and see how this works. Thanks so far. I guess the screen aligned quad could be accomplished with a geometryshader? Or would this be a bad use of it? – Psychopathy

That'd work, although I wouldn't use a geometry shader for simply rendering a quad :) – Dupaix

Added my comment as an answer, please be sure to accept it so people who come by later will know it as such. – Dupaix

You are right. I guess im just using a VertexBuffer then. – Psychopathy

Answer 1

You will have to set it each time you want to render to the texture, yes (and as long as you haven't switched to another render target or the back buffer). Once you've rendered the data to the texture, set up the shader that processes this data and draw a screen aligned quad with this texture.

Dupaix