Re: [PyOpenGL-Users] glGetUniformfv

[Gijs <in...@bs...>]

Glad we cleared that up :)

Anyway, I tried it out, but I couldn't get it to work either. 
glGetUniformfv seemed to be defined as glGetUniformfv(programloc, 
varloc, returnvalues) in PyOpenGL, same as the default C spec. Normal 
PyOpenGL functions aren't defined this way. As you said, the return 
values are normally returned instead of passed along with the function call.

When I tried to call it with three parameters, it did not even touch the 
returnvariable. So I assume there is a bug somewhere. Also, the function 
requires an array to be passed as a returnvariable, but the return value 
is always one value, never an array. You simply cannot ask for the 
values of an entire shader-array. You'd need to call glGetUniformfv for 
each element of the array.

It might work if you pass a ctypes float along with it, however I have 
no experience with ctypes stuff, so I'll leave that to the experts.

Gijs

On 6/6/10 16:06 , Ian Mallett wrote:
> On Sun, Jun 6, 2010 at 1:31 AM, Gijs <in...@bs... 
> <mailto:in...@bs...>> wrote:
>
>     I don't think I've ever had to use it before, but you usually give
>     the program location and the variable location. So it would be
>     something like this:
>     value = glGetUniformfv(programloc, varloc)
>
> Oops!  I actually tried that.  Typo.
> value=glGetUniformfv(programlocation)
> Should have been:
> value=glGetUniformfv(program,location)
> Ian