Category archives: Snaking
Discussions of programming, particularly of programming Python
Being pushy helps
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Snaking.
I've been wanting to try out the two presentations for PyCon somewhere. I'll probably inflict a version of the OpenGL one on PyGTA on Tuesday (minus the "migration" parts, as very few people here are already using PyOpenGL). But I still needed a forum full of victims for the Profiling one. I was very pushy ...
Long day's Dojo into AJAX
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Snaking.
Spent the whole day working on Dojo widgets... seems I spend almost every day these past few months working on Dojo widgets. The Dijits (as they call them) are far more robust than the per-page custom-coded stuff that I'm replacing, and we're winding up with a fairly generic collection of "things" from which we can ...
Fixed bug in generic attribute support
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Snaking.
Working up the sample code for the "legacy free" section of the PyOpenGL talk for PyCon I discovered that the glVertexAttribPointer wrapper never got finished. You could pass in c_void_pointers, but other than that it just wouldn't work. Obviously not a lot of people using the generic attribute support in PyOpenGL... but then I knew ...
Audio Monitor for System Load in CSound (Using CSound from Python)
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Snaking,
Young Coders.
To try to help out with Seneca's presentation today on the Python interface to CSound I tried to create a small demonstration application. It shows the use of CSound's "real time" Python API, that is, the API that allows you to poke notes directly into the score buffer for playing.
glInterleavedArrays is deprecated...
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Snaking.
Doing a bit of after-work hacking on the PyOpenGL presentation, just realized that glInterleavedArrays is deprecated. It's pretty trivial to rewrite as array pointers when you have VBO objects:
glInterleavedArrays( GL_T2F_N3F_V3F, 0, data )
Becomes:
glEnable( GL_VERTEX_ARRAY )
glEnable( GL_NORMAL_ARRAY )
glEnable( GL_TEXTURE_COORD_ARRAY )
glVertexPointer( len(data), GL_FLOAT, 32, data+20 )
glNormalPointer( len(data), GL_FLOAT, 32, data+8 ...
Presentations are Roughed Out
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Snaking.
Have the basic outline for the two PyCon presentations worked out now. I'll need some more work to pull together really good sample code for the PyOpenGL one. I added the ability to load multiple profile files to RunSnakeRun as I worked on the profiling presentation (one of those, "oh, yeah, I'm describing how to ...
Sure, I'm fine, but...
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Snaking.
Realized today as I wrote the presentation for PyOpenGL that one of the bullet points "calculate the transform matrix yourself" is going to be a considerable challenge for new users of (Py)OpenGL. OpenGLContext/PyVRML97 has code to do this already for its hierarchy of nodes, but it's a C-coded extension to have reasonable performance.
May need ...
Should make the VBO objects act as arrays if no implementation
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Snaking.
As I'm going through the (rather mechanical) process of eliminating the deprecated OpenGL functionality from OpenGLContext, I'm discovering something I hadn't thought about before, when I was on the library providing side. Namely that most of the time what you really want to do is to create the VBO and if there's no implementation, still ...
Adding Shader support to OpenGLContext scenegraph
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Snaking.
Got distracted writing the presentation this evening. I wanted a simple set of examples of shader usage, particularly with respect to replacing fixed-function pipeline operations (there's a number of partial solutions in the various OpenGL books I have on my bookshelf, but I haven't found anything that looks like a complete reimplementation, though there are ...
Need to make Py3D easier to maintain
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Snaking.
[Update] also need to check the address when I hit "reply" on a message on ...
Mike C. Fletcher, the VRPlumber, is a philosopher of design turned computer programmer based in Toronto, Canada. He works primarily in the Python programming language, and maintains a large number of Open Source software packages. You can reach him at: mcfletch@vrplumber.com.