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Sprites rendered with Alpha Test On do not render if Multisampling

Question asked by Chuckles_UK on Mar 7, 2012
Latest reply on Mar 9, 2012 by gsellers

Hi,

 

I've got a bug where rendering sprites with alpha testing (but no alpha-blending) doesn't appear to work when rendering to an anti-aliased frame buffer.  I'm using OpenGL and the card in question is an HD5670, but this may apply to other cards too.  The same code works fine on a number of other (non-ATI) graphics cards, so I'm guessing the problem is either:

  1. A bug in the ATI driver
  2. A 'feature' of OpenGL that is supported differently by different platforms - the documentation surrounding the use of Framebuffers and the reporting of errors seems to be sadly lacking.

Does anybody have any suggestions?

 

Cheers,

Charles

 

Charles Blessing

Senior Programmer

Team17 Software Ltd.

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