Christian,
Thanks a lot for the example code. It appears you are using an
internal format of GL_FLOAT_RGBA32_NV and a texture target of
GL_TEXTURE_RECTANGLE_NV. I was trying to use GL_TEXTURE_2D. Now that
I look, I see the spec for NV_float_buffer states "floating-point
texture maps must be 2D, and must use the NV_texture_rectangle
extension." Argggg!
Anyway, I have found another suitable solution to my particular
problem by using an internal format of GL_LUMINANCE16, which works
fine with GL_TEXTURE_2D. As for the clamping to {0,1}, I think I'll
just have to pass a scalar to my shader by which to multiply the
texture values.
--
Terry Welsh - mogumbo 'at' gmail.com
www.reallyslick.com | www.infiscape.com | www.vrsource.org
On 4/24/05, Christian Lessig <[EMAIL PROTECTED]> wrote:
> Hi Terry,
>
> I attached a small example program which works for me. Maybe you should
> compare the parameter (the relevant things are in the
> 'createTextureChunk()' function).
>
> Regards,
> Christian
>
> Terry Welsh wrote:
>
> >I tried a bunch of them: GL_LUMINANCE, GL_FLOAT, GL_FLOAT_R32_NV
> >(this one I hoped would work but it comes out black),
> >GL_FLOAT_RGBA32_NV, and a few others I can't remember right now. I'm
> >using an NVidia 6800GT on Fedora Core 2.
> >
> >On 4/24/05, Christian Lessig <[EMAIL PROTECTED]> wrote:
> >
> >
> >>Hi Terry,
> >>
> >>what internalFormats did you tried and what graphics boards are you using?
> >>
> >>Regards,
> >>Christian
> >>
> >>Terry Welsh wrote:
> >>
> >>
> >>
> >>>I'm trying to use a floating point texture in a GLSL program. My
> >>>image is set up like this:
> >>>
> >>>mImage->set(Image::OSG_L_PF, 512, 512, 1, -1, 0, 0.0, (UInt8*)data,
> >>>Image::OSG_FLOAT32_IMAGEDATA);
> >>>
> >>>where data is actually of type Real32*. When these texture values
> >>>come into my shader, they appear to have been clamped to the range
> >>>{0,1}. I have experimented with TextureChunk::setInternalFormat with
> >>>no luck. My texture either stays within {0,1} or comes out black.
> >>>Anybody know how to get around this problem?
> >>>
> >>>
> >>>
> >>>
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