Hi Oliver,
On Thu, 2005-10-06 at 18:16 +0200, Oliver Kutter wrote:
> Hi all,
>
> I want to do some general purpose computation with shader and want to do
> some render-to-texture. The result texture is a 16bit float or 32bit
> float texture. I use a framebuffer object which holds the float texture
> to render to. Can I render float values to that texture with a shader?
> Now, when I want the shader to store a value into the texture (with
> gl_FragColor), which is much bigger than 1.0 (e.g. 50.0), the result in
> the texture is only 1.0 and not 50.0!
>
> Can anyone help me?
By default OpenGL clamps colors to [0..1]. The ARB_color_buffer_float
extensions adds a new function glClampColorARB(), that can be used to
explicitly turn it on and off. But the spec says that by default only
colors for fixed-point buffers are clamped.
It sounds like that's not what you're seeing, so maybe your driver has a
problem there (or you're not actually getting a float FBO). You can try
setting it explicitly using that function, and see if that helps.
Yours
Dirk
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