On 10/18/2010 06:48 PM, Carsten Haitzler (The Rasterman) wrote:
On Mon, 18 Oct 2010 12:57:25 -0500 Rendaw<[email protected]> said:
I guess I sort of expected glx to handle that, since, should it not, I'd
have to change all my calls to glBlendFunc/glColor, glClearColor, and
yup. you need to change them. as such it won't hurt - you should use premul
argb anyway. there is no other sane way to do destination alpha rendering and
keep rendering correct - so if you ever render to an fbo for example - you'll
need this mode if you ever want that fbo to have an alpha channel of its own
etc.
I didn't think it through, but I still think there are some corner cases
(like additive blending in-application) that might cause problems
without rendering to an intermediate surface, but uhh... I can't think
of how that would be defined anyways.
all my shader code, right? Or is there an easier way to get
premultiplication? Well, I guess transparent applications aren't
exactly common, anyways.
well that depends what you are doing in your shaders :) and also what your
textures are. as such i moved my entire rendering pipeline to premul ages ago -
textures are premul argb, as are fbo's, buffers and everything. once youa re
there life is easy.
I think you're right, I'll follow your example.
Thanks again!
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