Category archives: Snaking

The pyopengl-video library is a small hack that lets you pass FrameBufferObjects (FBOs) directly to the local platform video encoding library (or allows you to use your existing video buffer as an FBO, depending on the platform). The purpose of the library is to allow an off-screen renderer to generate h264 in mp4 video previews ...

So now we're starting to cash in on the various changes we've made to PyOpenGL, namely dropping Python 2.7 support and adding the more extensive test suite. The effect of those is that we can create a table-driven dispatch accelerator in OpenGL_accelerate. In plain terms, write a C module that provides the core OpenGL API ...

I've released a new library opengl_extrusions which is a Numpy and Cython library that does 3D extrusions (like the GLE library) and tessellations (one of the things the GLU library does). The motivation being that the GLE library is constrained to compatibility contexts (think "legacy OpenGL"), so it doesn't work under modern core-profile contexts. The ...

Another OMI-based extension, this time for positional audio mixing. Again, Claude-coded, using the OMI/KHR audio extensions for glTF as the base model and then implementing the actual mixing using Numpy. Supports mp3, wav, opus and flac inputs and stereo (headset) outputs. Up on github as omi_audio and on PyPI as omi_audio as well.

This is ...

I had Claude code up an OMI Physics package using Numpy. It's up on pypi as omi_physics. This follows the OMI extensions to glTF pretty closely to create an engine with the common features you need. It's not trying to be real-world physics, it's just a game engine style simulation.

The core is GL-free, ...

Continuing on with the Open Source work. PyVRML97 2.3.4b1 is almost all build and CI process updates. There are a few minor fixes for modern Python's where bool can't be used as a list index and a change for NumPy 2.x array comparison failures. This beta is mostly just so that we can pull it ...

I've been trying to make some time for Open Source projects again. I've been using LLMs for much of the coding because the vast bulk of it at this point is just grunt work. First up is PyOpenGL. The tests the LLM produced turned up a bunch of bugs in the core that have lain ...

So I'm currently trying to figure out why the PyOpenGL 3.12 test suite is failing. There's a particular test that looks for VBO memory leakage and it looks loosely like this:

for i in range(100):
    create_a_vbo_and_delete_it()
    calculate_total_process_memory()
    assert_no_leak()

It seems that we've removed an entry point that pip 22.0 uses from Python 3.12. That means that you need to install pip from get-pip.py on Ubuntu LTS python3.12.

However even with that done and tox supposedly configured to use pip 23.2.1 in its virtualenvs, I still wind up with pip 22.0 in the ...

So starting to think about a PyOpenGL 4.x release, which would be first to drop Python 2.7 support, so the first one where type-hints can be used to declare metadata for type-coercion (vs the current nonstandard type declarations). The first big question that comes up is:

Given an open collection of types {A,B,C,...}
And a ...