On Apr 21, 06 19:30:28 +0300, Jaakko Hyvätti wrote: > On Fri, 21 Apr 2006, Brian Paul wrote: > > I think the confusion is whether you want the resulting image to be in > > premultiplied, or non-premultiplied format. It sounds like you want > > the later. That's actually fairly uncommon. > > You hit the point here. I want the later, uncommon thing.
O-key. Actually, I'm currently unsure whether this is easily posible with OpenGL's color model at all. Have to do a little bit of maths first, but maybe you have already done that. > I am not thinking of rendering a final image, like everyone else. I > want to create a translucent image that can be used later on top of > another image, with perfectly blending smooth edges. The colors must be > non-premultiplied, or the result is crap when it is finally blended to > some random background. Why that? As I wrote there has been a long going argument about premultiplied vs. non-premultiplied, but that had only been due to rounding issues. The over operator is associative, both in premultiplied and nonpremultiplied form. I remember having done something similar, and it worked with the standard blending mode. > As nobody else ever seems to need this, it can be restricted to software > renderer. It is just efficient and convinient for me to do it this way. And a corner case, which cannot easily be accelerated. Have you thought about using pixel shaders and rendering to textures for that? Matthias -- Matthias Hopf <[EMAIL PROTECTED]> __ __ __ Maxfeldstr. 5 / 90409 Nuernberg (_ | | (_ |__ [EMAIL PROTECTED] Phone +49-911-74053-715 __) |_| __) |__ labs www.mshopf.de ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid0709&bid&3057&dat1642 _______________________________________________ Mesa3d-dev mailing list Mesa3d-dev@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/mesa3d-dev
