AnsweredAssumed Answered

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



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?





Charles Blessing

Senior Programmer

Team17 Software Ltd.