[PyOpenGL-Devel] [ pyopengl-Patches-643038 ] Tk Rawopengl resize / matrix mode fix

[<no...@so...>]

Patches item #643038, was opened at 2002-11-24 13:10
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=305988&aid=643038&group_id=5988

Category: Tk
Group: v2.0
Status: Open
Resolution: None
Priority: 5
Submitted By: Tom Whittock (tomwhittock)
Assigned to: Nobody/Anonymous (nobody)
Summary: Tk Rawopengl resize / matrix mode fix

Initial Comment:
Apologies for this not being in a proper patch format.
I can't find the file in your CVS respository, so I
don't know if this is even relevant anymore.

If you attempt to resize a Rawopengl Widget, you can
get into a situation where it recieves a tkRedraw-using
message during the update_idletasks call inside
tkRedraw. This is only a problem inside the
gl{Push|Pop}Matrix pair, since you can cause a stack
overflow.

Also, I wouldn't rely on self.redraw  to keep the
matrix mode as projection, so I put another matrix mode
set in there.

Here's the "fixed" function. Perhaps it'd be a good
idea to know why update_idletasks is being called in
redraw.

distribution file: OpenGL/tk/__init__.py
class Rawopengl:
	def tkRedraw(self, *dummy):
		# This must be outside of a pushmatrix, since a
resize event
		# will call redraw recursively.
		self.update_idletasks()
		self.tk.call(self._w, 'makecurrent')
		_mode = glGetDoublev(GL_MATRIX_MODE)

		glMatrixMode(GL_PROJECTION)
		glPushMatrix()

		self.redraw()
		glFlush()

		glMatrixMode(GL_PROJECTION)
		glPopMatrix()

		glMatrixMode(_mode)
		self.tk.call(self._w, 'swapbuffers')


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https://sourceforge.net/tracker/?func=detail&atid=305988&aid=643038&group_id=5988