Draw to an NSOpenGLView or NSView without subclassing them?
Draw to an NSOpenGLView or NSView without subclassing them?
- Subject: Draw to an NSOpenGLView or NSView without subclassing them?
- From: mirage_3d <email@hidden>
- Date: Thu, 26 Feb 2009 22:15:32 +0800
hi there,
i'm designing a simple engine for a small app i'm developing and would like
to render some opengl in the interface. designing my engine, i would like to
have all the different components to inherit from one main entity class that
provides many engine-specific functions and data. problem is objective-c
doesn't allow multiple inheritance and cocoa opengl api - or any cocoa
viewport drawing method for that matter - implements opengl rendering by
subclassing NSView or NSOpenGLView.
so my question is whether it's possible to draw to either of the above
classes without subclassing them - by having my viewport-rendering class use
one of them as an ivar - and without resorting to the other OpenGL APIs -
CGL or AGL? i know categories and protocols provide a way around multiple
inheritance, but i would lose the engine-specific data in addition to super
class message propagation. i have done some research but found very little
out there regarding rendering engines in objective-c or cocoa, and i'm also
still a rookie in cocoa land.
thanks in advance for any help,
mirage3d
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