[ pyopengl-Bugs-2561765 ] Wrong image size for glReadPixels()

Bugs item #2561765, was opened at 2009-02-03 19:26
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Andrew Straw (astraw)
Assigned to: Nobody/Anonymous (nobody)
Summary: Wrong image size for glReadPixels()

Initial Comment:
I've been tracking down an error with the Vision Egg and PyOpenGL 3. (This code works fine with PyOpenGL 2.) The code that led me to this issue is line 476 of VisionEgg/Core.py [1], which is a call to glReadPixels(). Basically, doing glReadPixels with a format of GL_BGRA and type of GL_UNSIGNED_INT_8_8_8_8_REV returns an NxMx4 array of type uint32. I think this should either be an NxM(x1) array of type uint32 or an NxMx4 array of type uint8.

The code at issue seems to be in OpenGL.images.createTargetArray(). It is responsible for creating the mis-sized array. I hesitate to suggest a patch, since I'm not sure what the optimal solution is, but this is at least a change of behavior since PyOpenGL 2.

I am including a test which hopefully clarifies my thinking about the proper size of the array.

[1] http://visionegg.org/trac/browser/tags/release_1.1.2/VisionEgg/Core.py#L476

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