Packing a float into an RGB-value

[Jan]

Hi there

I´d like to write gl_FragCoord.z into gl_FragColor. gl_FragColor targets the framebuffer (32 Bit RGBA). Of course i´d like to get the full precision of gl_FragCoord.z, so i need a way to "pack" it into the color.

However i couldn´t find any packing-function in the glsl-spec. I am not sure, but if i recall correctly, ARB_fp had such a function, no?

Bitshifts aren´t supported yet, either.

So, how could i do that?

Thanks,
Jan.