Re: [pygame] Shaders and Examples not Working

["René Dudfield" <renesd@xxxxxxxxx>]

Hi,

at one point they did work...

However pyopengl 3 is still in beta and has been changing a lot
recently... causing some things to fail.

There's been a recent fix in cvs to get them working on windows again
(I think your platform).

I know that recently a bunch of shader examples were added to cvs too.

So... use pyopengl cvs, and help out with bug reports and patches :)
Mike is pretty responsive over there, but if you have any patches I
can apply them as well if you need.



cheers,



On Tue, Oct 21, 2008 at 1:42 PM, Ian Mallett <geometrian@xxxxxxxxx> wrote:
> Hi,
>
> I've been doing lots of cool stuff with PyOpenGL, but frankly, with cooler
> effects comes more complexity, and when things get more complex, PyOpenGL
> "fixed function" techniques do not seem to be the answer.  A dynamically
> rendered cubic reflectionmapped object is complicated enough.  So is a
> dynamically updated framebuffer shadowmapped object.  I just barely got
> these working, and they aren't simple to implement at all.  Try putting the
> two together?  How would you add real-time refraction?  Caustics?  Some of
> these fixed function effects aren't exact either, and some are slow.
>
> The solution, I've gathered from day 1, is to use shaders, which are
> programs run on the GPU.  They're faster, simpler to use, more powerful and
> flexible, and all-around just cool.  That's great and everything, but
> shaders, simplifying and inherently simple though they are, seem immune to
> implementation in PyGame, by which I mean, no one seems to know how to do
> it.  Which brings me to my point, or rather my exception.  There are shader
> examples on our very own pygame.org.  However, neither of the shader
> examples work for me, even after I made the obvious modifications.
>
> The obvious observations were made:
> -These apparently worked as recently as OpenGL 2.0, which is recent, but not
> amazingly so.
> -My computer does support shaders, so it's not a hardware issue--It was
> bought after these tutorials were written, and it was middle-range at that
> time.  Further, PyGlet shader programs, and commercial programs seem to work
> just dapper.
> -Aside from these tutorials, no other shader examples in PyGame and PyOpenGL
> could be had anywhere on the net.
> -PyGlet supports shaders, but PyGame doesn't?  Seems improbable, as shaders
> are PyOpenGL stuff.  Does PyGlet use the PyOpenGL port of the outdated
> OpenGL 2.0?  If so, why did the PyOpenGL people depreciate what they call
> "the future of graphics" in a newer release?  OpenGL 2.1 sure doesn't.
>
> So, does anyone know how to make a shader program?  They should be really
> simple judging by the complexity of the broken examples and what I already
> know on the topic.  Perhaps someone who knows a bit more PyOpenGL and/or is
> more familiar with Python and/or PyGame than I do could write a new
> tutorial?
>
> I'm really hoping to get somewhere with shaders, but the examples on
> pygame.org don't work.
>
> Please help, thanks,
> Ian
>