Author archives: Mike

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 ...

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 ...

The OLPC seems to have run off a cliff.  Sugar labs seems intent on continuing their OS UI experiments, which might bear fruit in a few years, but which for now make development for the platform untenable.  Sad to see all that wasted potential that seemed to just lack someone practical saying "hey, you need ...

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 ...

She almost missed Schroedinger's cat door.

"Your clone's warranty expired upon fertilization."

Jennifer disappeared soon after perfecting fusion.

Embarrassingly, his clothes did not follow.

Blue-collar photon entanglers started looking.

"Ned spoke for Earth without authorization."

These Armageddon parties need to stop.

Inanimate crystals were her best clients.

Inanimate crystals ...

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 ...

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 ...

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 ...

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 ...