gltexId = moglMakeGLHDRTexture(hdrImage, gltextarget [, halffloat])

Create a high dynamic range OpenGL texture from the given
Matlab/Octave high dynamic range image matrix ‘hdrImage’ and attach
it to the OpenGL texture target of type ‘gltextarget’.

Before calling this function you must have called Screen(‘BeginOpenGL’, win);
with ‘win’ being the window handle for the onscreen window to
which the texture should be attached.

Returns an OpenGL texture handle ‘gltexId’ for the created texture.
The texture can be used like any other OpenGL texture, just
with the difference that it represents its color values with 32 bit
floating point precision instead of 8 bpc fixed point precision.

‘hdrImage’ must be a (height, width, 4) matrix of type ‘double’ or
‘single’, where channel 1=Red, 2=Green, 3=Blue, 4=Alpha. The numeric
range (0.0 - 1.0) maps to (minimum intensity - maximum intensity).

If ‘halffloat’ is set to 1 (default is 0), then the texture is created as
half-precision floating point texture, ie 16 bpc floats. This saves
memory and bandwidth and allows for floating point filtering on Geforce
6000 and 7000 series.

If you want to create a pure 2D texture and use it with Psychtoolbox’
standard Screen() drawing command, then call moglMakeHDRTexture() instead.

This function is most useful if you want to create textures not handled
by Psychtoolbox, i.e., cube map textures for environment mapping and
texture based lighting.

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