Re: [PyOpenGL-Users] Rolling spectrogram with pyopengl

[Timothée L. <tim...@lp...>]

Le 7 déc. 09 à 00:00, Greg Ewing a écrit :

> Timothée Lecomte wrote:
>> As far as  alternatives to pure glTexSubImage2D, I have considered  
>> and tried to  use PBO, but it does not decrease the time needed by  
>> the two  glTexSubImage2D calls.
>
> This is puzzling, because transferring 1000 pixels of data
> shouldn't take very long, even if you're not doing it the
> most efficient way.
>
> The only thing I can think of is to try using different
> pixel formats for the texture data. Fastest CPU->GPU transfers
> occur when you use a pixel format that matches what the
> GPU uses, so that no conversions are needed.
>

That's an advice I've seen very often on opengl pages on the web. Is  
there a way to know at runtime what is the native format ?

Thanks Greg.

Timothée