Re: [Dri-devel] OpenGL 1.3, 1.4, and extension string issue

[Keith Whitwell]

Ian Romanick wrote:

From what I have been told, this is how it works on the Nvidia drivers.  I

have not verified this first hand.

    if ( extension string contains "GL_EXT_texture3D" )
        3D textures are hardware accelerated
    else if ( advertised OpenGL version >= 1.2 )
        3D textures are a software fallback
    else
        3D textures are not supported at all

So, a TNT will advertise OpenGL version 1.2 but not GL_EXT_texture3D.  3D
textures will work, but they will be sw rendered.  On whichever Geforce
supports 3D textures in hw, OpenGL version 1.2 AND GL_EXT_texture3D would be
advertised.  It's not a perfect system, but it fixes most of the cases where
an app checks the extension string to see of some feature is supported in
hardware and gets an upleasant surprise from a sw fallback.

It does seem semantically richer than the standard way of doing things. I wonder if the spec gives some wiggle room on this.

Keith



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