On Tue, Sep 9, 2008 at 12:31 PM, 3TATUK <[EMAIL PROTECTED]> wrote: > > Ah! Thank you very much. Yes, window.Window.dispatch_events() certain > _does_ set it up properly so I can now use the active framebuffer as a > 'drawing board' for alpha blitting. So for example, say I have > 20,000x20,000 pixel texture.. it will take ``only'' 1302 > blit_into()s. This also assumes that the 'destination' texture > doesn't have any alpha in it :)
All OpenGL implementations I'm aware of have a maximum texture size of 8192x8192, and most have maximum 4096x4096. Older cards are limited to 2048x2048. Also be aware that most older non-nvidia cards will not keep textures intact when swapped out of memory -- if you exceed your graphics memory you'll start getting blank textures. (Newer cards don't have this problem). > Also, your suggestion of setting up a hidden window for use as this > 'temporary buffer' isn't quite a good idea because I've tested it > thoroughly and there's no obvious way to avoid that window having > 'popped up' at some time, for a fraction of a second. Use the visible=False parameter in the Window constructor. > > Well, actually now that I think about it, I haven't tried it with > dispatch_events() which might help.. but even so it would be much > nicer if pyglet.image.Texture.blit_into() would call the necessary GL > for alpha preservation. :> It think you misunderstand: there _is_ no GL command that does this. blit_into uses glTexSubImage2D, which has no options for blending or masking. OpenGL can only composite into a framebuffer or renderbuffer (using the framebuffer object extension), or by creating a separate context on a pbuffer rendering to the texture (not supported at all on Linux or older video cards; and pyglet does not (yet) have any pbuffer support). Alex. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "pyglet-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/pyglet-users?hl=en -~----------~----~----~----~------~----~------~--~---
