Re: [PyOpenGL-Users] How to use shaders in pyopengl

[Mike C. F. <mcf...@vr...>]

Mike C. Fletcher wrote:
> Dirk Reiners wrote:
>   
>> 	Hi Mike,
>>
>> any news on the Windows shader problem? has anybody else been able to reproduce it?
>>   
>>     
> Not yet.  I've been able to use extensions on my XP laptop, but it 
> doesn't have shader support.  My Win2K machine (which has a reasonable 
> video card) spent the entire time I was intending to work on it just 
> getting updated and cleaned up so it would run properly.
>
> Take care,
> Mike
>   
I found the bug.  Basically there was a wrapper for 
glShaderSource/glShaderSourceARB which was not passing in the 
"extension" parameter which was being used to decide whether the 
function should be available.  Previously we would just try to get the 
function and check for a NULL pointer, but the Mesa implementation 
decided to start returning non-null pointers that just print out warning 
messages when you try to call a non-existent function, so we started 
checking for the extensions.  Unfortunately, the wrapper didn't get 
updated, so the test was always coming up false.

Anyway, with current CVS shaders should work on Win32.  I'll likely be 
doing some further refactoring of the base platform module to clean it 
up and see if I can discover the problem on OSX tomorrow.

Take care,
Mike

-- 
________________________________________________
  Mike C. Fletcher
  Designer, VR Plumber, Coder
  http://www.vrplumber.com
  http://blog.vrplumber.com