Thanx. I'm trying to use the half class from OpenEXR. I'll let you know.
Erik
2009/1/19 Shree Kumar <[email protected]>
> Hi Erik,
>
> On Mon, Jan 19, 2009 at 6:59 PM, Erik Podetti <[email protected]>
> wrote:
>
> > But how can I write to a binary file 16-bit floating values? I read that
> > there's an OpenGL extension that should add the "half" GL data type
> > (
> http://www.nvidia.com/dev_content/nvopenglspecs/GL_ARB_half_float_pixel.txt)...but<http://www.nvidia.com/dev_content/nvopenglspecs/GL_ARB_half_float_pixel.txt%29...but>
> > I didn't succed in including it in any way. Anyone has already used this
> or
> > another type of variable to write float 16 values to a file?
>
> I'm not sure if OpenSG supports such file formats.
>
> If not, you could have a look at the "Half" class from
> http://www.openexr.com/. OpenEXR has support for reading/writing
> images with floating point data. The Half class in OpenEXR provides a
> C++ class that you can use as easily as using "int" and "float".
>
> However, if all you want to do is save 16 bit floating point images,
> then a quick way out is
> - do a ReadPixels to a buffer of the proper size (width*height*4*2
> bytes for RGBA16F). Use format=GL_HALF_FLOAT_ARB and type=GL_RGBA
> - write all those bytes to the file
>
> To load the images
> - open the file, read in all the width*height*4*2 bytes
> - treat this buffer as the source for pixels - textures or images
>
> HTH
> -- Shree
> http://paracomp.sourceforge.net/
> http://www.shreekumar.in/
>
>
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