Den 19:04 29. mars 2012 skrev Kyle Sluder <k...@ksluder.com> følgende: > On Mar 29, 2012, at 5:12 AM, lbland <lbl...@vvi.com> wrote: > >> ... look at the call stack. On the Mac fill most likely calls opengl in the >> end as "Quartz GL" has gotten pretty good. > > Quartz GL is not enabled by default. > > Also, see this: > http://cocoawithlove.com/2011/03/mac-quartzgl-2d-drawing-on-graphics.html > > --Kyle Sluder
I notice that while filling rectangles is much faster, drawing lines are slower with QuartzGL. Also, while filling rectangles behaves exactly the same way in Quartz as in pure OpenGL, stroking lines do not. If you magnify your drawing by manipulating the bounds of the view, the width of the lines changes in Quartz. If you do the same thing by manipulating the projection matrix in OpenGL, the lines stay the same width, only the shapes are enlargened. This has led me to believe that lines drawing in Quartz is more complex than simple line drawing in OpenGL. Probably also higher quality. I have no idea whether there is any connection there. I suspect text rendering is software-based also in QuartzGL. Hard to tell. The timings were very similar. One key to high performance GPU-accelerated drawing is to make sure that data that doesn't change, doesn't have to be transferred back and forth between the CPU and GPU. I think, perhaps, it may be hard for the higher-level APIs to have enough information to ensure this. You may need detailed information about how your program will behave. Per _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
