GS/HW: Convert depth16->rgba16 shader to integer #10053
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Description of Changes
Converts the non-metal shaders (metal already does this) for depth 16 -> rgb5a1 to use integer full range conversion
Most of the work done by Stenzek (I mostly just helped with the debugging and poked the code in lol)
Rationale behind Changes
The old way had off by 1 problems and was not really possible to get correct without coming across rounding issues.
Suggested Testing Steps
Test Shadow Tower Abyss make sure the shadows render correctly and the screen isn't too dark.
Fixes #3281
Master:
PR:
