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Deferred shading and MSAA


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#1 KaiserJohan   Members   -  Reputation: 1244

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Posted 16 June 2014 - 04:50 AM

I'm trying to tackle MSAA in deferred shading.

Here' my current deferred shading pipeline:
 

Code :
1. Geometry stage - Render geometry to textures (position/normals/diffuse)
2. Shading stage - all output is rendered & blended into a "final texture"
  2.1 Render ambient light
  2.2 Render directional lights and shadows
  2.3 Render point lights and shadows
3. BlitFramebuffer() on the final texture
4. Swapbuffers and repeat 1.

In 2.1, 2.2 and 2.3 I need to read gbuffer textures (position/normals/diffuse) to do the lighting and shadowing.

My question is now, how do I most effectively accomplish MSAA (or any other form of good AA)? Do I have to read a number of samples in all the 3 shading passes (2.1, 2.2 and 2.3: sounds expensive!) or what? Is there any hardware support on can use?



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#2 HappyCoder   Members   -  Reputation: 2887

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Posted 16 June 2014 - 01:19 PM

It seems like the most common approach is to do an edge detection, based on the depth and the normals, and blur the image a little around the edges.

 

http://visual-computing.intel-research.net/publications/papers/2009/mlaa/mlaa.pdf

http://en.wikipedia.org/wiki/Fast_approximate_anti-aliasing


Edited by HappyCoder, 16 June 2014 - 01:20 PM.





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