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shaders/colorspace: don't explode on luma > 1000

Niklas Haas requested to merge fix_bt2446a_luma into master

The current desaturation function extends linearly to infinity, resulting in very bad behavior for extreme HDR->SDR ratios (e.g. 49:1). Replace it by a logarithmic map to smooth this out more naturally at an asymptote.

This is more or less what the original code was intending, I think.

Fixes: 73785267

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