Python wrapper for NVidia Cg Toolkit
What is python-cg?
python-cg is a Python wrapper for NVidia Cg Toolkit runtime. I’ve started it because I like Python, I like NVidia CG and I want to to do some computer game/3d graphicsprototyping and research. Also I still find C++ counterproductive as far as my needs are concerned and I don’t want to waste my time doing boring stuff. Programming in Python is fun.
I know about some projects that were meant to bring CG to Python but as far as I know they’re history now.
Project is hostead at GitHub: https://github.com/jstasiak/python-cg.
What’s the state?
The project is in very early development stage. Overview of what’s supported right now:
creating from file
creating directly from source code
accessing effects` techniques and their passes
accessing effect parameters with their names, semantics and parameter-specific metadata (rows, columns etc.)
setting sampler parameters and most of numerical parameters
What doesn’t work at the moment and there’s no plan to implement it:
everything that’s left (well, until I decide I need some of it or someone else does that)
This project requires:
NVidia Cg Toolkit ≥ 3.0
Python interpreter (+ development files):
2.x ≥ 2.6, or
3.x ≥ 3.2
C and C++ compiler
Python packages required to build and install python-cg:
Cython ≥ 0.18
To build documentation/run tests you also need:
Mock ≥ 1.0
Nose ≥ 1.2
Sphinx ~ 1.2 (development version)
Pregenerated documentation can be found at https://python-cg.readthedocs.org/en/latest/.
You can also build documentation all by yourself by calling:
sphinx-build -b html docs docs/build/html
Generated HTML files are placed in docs/build/html/ directory.
To build the project in place, run:
python setup.py build_ext --inplace
This project works with OpenGL and OpenGL only
It uses row-major matrices by default, just like numpy does
from cg import CG cg = CG() context = cg.create_context()
We want to use an effect to render some stuff so we’re gonna create Effect from file:
effect = context.create_effect_from_file('effect.cgfx')
We now have access to Effect’s techniques and parameters:
for technique in effect.techniques: # ... for parameter in effect.parameters: # ...
For the sake of simplicity let’s say we have a parameterless effect with only one Technique:
technique = effect.techniques
gl.glClear(gl.GL_COLOR_BUFFER_BIT) for pass_ in technique.passes: pass_.begin() gl.glBegin(gl.GL_TRIANGLES) gl.glVertex3f(-0.5, -0.5, 0) gl.glVertex3f(0.5, -0.5, 0) gl.glVertex3f(0, 0.5, 0) gl.glEnd() pass_.end() # swap buffers
You can find complete, runnable example application in example directory. Please note that it requires (in addition to python-cg requirements):
Development version of SFML 2
Python packages listed in example/requirements.txt:
pip install -r example/requirements.txt
Then to run the example:
python setup.py build_ext --inplace PYTHONPATH=. python example/main.py
To run tests, execute:
© 2013, Jakub Stasiak
This project is licensed under MIT License, see LICENSE file for details.
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.