[bug #22706] NSOpenGLView broken ?

[Xavier Glattard]

Follow-up Comment #5, bug #22706 (project gnustep):

You're right : all examples of GLView use are different !

Two versions of BasicOpenGLView.m :
http://developer.apple.com/samplecode/CocoaGL/listing4.html
http://developer.apple.com/samplecode/Custom_Cocoa_OpenGL/listing2.html
And (with no prepareOpenGL) :
http://developer.apple.com/samplecode/BoingX/listing4.html
But :
http://developer.apple.com/samplecode/OpenGLFilterBasicsCocoa/listing1.html

In Cocoa drawing guide :
http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaDrawingGuide/QuartzOpenGL/chapter_10_section_3.html#//apple_ref/doc/uid/TP40003290-CH211-DontLinkElementID_93
<< As with other views, you use your OpenGL views drawRect: method to draw
the content of your view. When your drawRect: method is invoked, the
environment is automatically configured for drawing using the OpenGL graphics
context associated with your view. >>

I think most examples don't use NSOpenGLView properly : they use it as an
ordinary View, which it is not.

In the page you cite Apple gives a sample OpenGLView implementation. It's not
exactly like mine, but they use [lockFocus] and [prepareOpenGL].

About [prepareOpenGL] it is said :
<< This method is called only once after the OpenGL context is made the
current context. >>
I think this should be done as soon as possible, ie when the context is set
in [setOpenGLContext]. But it might be done later in [lockFocus] as it is not
supposed to be used before. I dont know.
The sample implementation never sends [prepareOpenGL] but it is said : <<
after creating the NSOpenGLContext object >>

Really looks like they aren't sure :-)



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