RE: [Openexr-devel] working with "half float" textures in OpenGL

[Simon Green]

Note that the NV_half_float extension has now been replaced with a
cross-vendor ARB extension:
http://www.nvidia.com/dev_content/nvopenglspecs/GL_ARB_half_float_pixel.
txt

This should be supported on NVIDIA cards in the next driver release.

> -----Original Message-----
> From: address@hidden 
> [mailto:address@hidden 
> On Behalf Of Drew Hess
> Sent: Thursday, February 17, 2005 3:27 PM
> To: Paul Miller
> Cc: address@hidden
> Subject: Re: [Openexr-devel] working with "half float" 
> textures in OpenGL
> 
> 
> 
> Hi Paul,
> 
> These should be helpful:
> 
http://oss.sgi.com/projects/ogl-sample/registry/NV/half_float.txt
http://oss.sgi.com/projects/ogl-sample/registry/NV/float_buffer.txt
http://www.ati.com/developer/SIGGRAPH03/Percy_OpenGL_Extensions_SIG03.pd
f

d


Paul Miller <address@hidden> writes:

> For those of you who have worked with these, I have a couple of 
> questions:
>
> 1. what extension(s) should you check for to detect if the hardware 
> supports the GL_HALF_FLOAT_NV texture format? This assumes you want 
> the broadest range of hardware.  Currently I am checking for 
> "GL_NV_half_float" but I haven't tried this on ATI hardware yet.
>
> 2. is it possible to have an RGBA half-float texture organized with 
> the channels in a different order (such as BGRA or ARGB)? Or must the 
> components be in RGBA order?
>
> Many thanks!
>
> --
> Paul Miller | address@hidden | www.fxtech.com | Got Tivo?
>
>
>
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