On Mon, Aug 29, 2011 at 8:32 PM, Alejandro Segovia <asegovi@gmail.com> wrote:
Hello Ian,

On Sun, Aug 21, 2011 at 12:42 PM, Alejandro Segovia <asegovi@gmail.com> wrote:
Hi Ian,

Ah, the driver might be where the difference is. I am using PyOpenGL 3.0.1 but I'm on a Mac, so I'm not using the NVIDIA drivers at all.Best,

I sent a bug report to NVIDIA, but evidently I have to be a registered developer to submit anything so technical.  I started the application process, so hopefully they'll be able to get the report in a few days.  Let me know how your tests go,

Sorry for the delay, I was really busy last week. I tried the script on Linux and, much to my surprise, I still can't reproduce the problem you describe.

I initially get a red quad and then I can turn on and off the white quad without any issues.

This is my system configuration, I'm on Fedora 12 x86_64:

>>> glGetString(GL_VERSION)
'4.0.0 NVIDIA 256.44'

>>> glGetString(GL_RENDERER)
'GeForce GTX 465/PCI/SSE2'

>>> glGetString(GL_VENDOR)
'NVIDIA Corporation'

I'm starting to wonder whether this could be a Windows-specific issue.

Well, I've finally took some time to try this on Windows. Unfortunately, I still can't reproduce the symptoms!

This is my system configuration:

>>> glGetString(GL_VERSION)
'4.1.0'

>>> glGetString(GL_RENDERER)
'GeForce GTX 465/PCI/SSE2'

>>> glGetString(GL_VENDOR)
'NVIDIA Corporation'

I'm on a 64-bit Windows 7 (Professional).

Is there anything I might be missing?
Well, I'm on 32-bit, and I have a different GPU.  I think it must be a particular combination of my GPU and my driver that's causing the issue.
Did you get any kind of reply from NVIDIA?
Sadly no.  I think I shall have to go yell at them again. 

I've read about them releasing OpenGL 4.2-capable drivers. Have you tried those?
The only ones I'd tried are 275.33, 266.58, and 280.26.

I wonder if this is a PyOpenGL problem.  Even though it seems like a hardware issue, perhaps there's something underlying that's causing the issue?  I'll see about writing a small C++ test.

Thanks for checking!
Ian