Re: [PyOpenGL-Users] Textures on Bad Hardware

[Almar K. <alm...@gm...>]

On 16 September 2010 02:47, Ian Mallett <geo...@gm...> wrote:

> On Tue, Sep 14, 2010 at 1:59 PM, Almar Klein <alm...@gm...>wrote:
>
>> The pretties way of doing this is checking the openGl version and if its <
>> 2.0, you need power-of-two textures. However, I recently encountered a
>> system with an ATI card, that did have OpenGl >=2.0, but did NOT support
>> non-power-of-two textures. So my current implementation just tries resizing
>> the texture if it fails to initialize, or if OpenGl <2.0.
>>
> I've simply added a global flag to my library that automatically resizes
> all textures to a power of two (either automatically up, or to the nearest
> level), and then made a note to favor power-of-two textures.  It's pretty
> lame that Intel does this.
>
> I don't suppose there's a more useful error that could be thrown here--does
> the GL return something helpful in this regard?
>

I'm not sure if I understand your question correctly. Are you asking for the
best way to detect whether power-of-two textures are required on a
particular system?  Well, what *should* work 100% is checking the opengl
version (with glGetString(GL_VERSION)). But since this is not always enough
for ATI, and maybe also for Intel, I check after creating a texture, whether
the texture is valid (with glIsTexture), and try making it a power-of-two if
its not.

Cheers,
  Almar