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Stencil Op/Comparison Values

Discussion in 'Documentation' started by Giometric, Oct 20, 2015.

  1. Giometric


    Dec 20, 2011
    The ShaderLab stencil documentation lists what the available stencil operations and comparison functions are, but does not mention that these correspond to various integer values (the UI shaders use Float variables that appear to get set by the masks/etc at runtime to take advantage of this). It would be nice if these were listed in the docs along with the values. The Stencil Operations list seems to match up, but the Comparison Functions does not. I couldn't find a list of the latter anywhere online, so I messed about for a bit and came up with one (hopefully it doesn't turn out this is device-specific or something, though I don't imagine the UI shaders working too well if that were the case):

    Comparison Functions
    • 0 - Always (?)
    • 1 - Never
    • 2 - Less
    • 3 - Equal
    • 4 - LEqual
    • 5 - Greater
    • 6 - NotEqual
    • 7 - GEqual
    • 8 - Always (? This is the default for the UI shaders so I suspect this one is technically the 'correct' Always, but any value beyond it will also count as Always)
    Stencil Operations (these seem to line up with the order they're shown in the docs):
    • 0 - Keep (?)
    • 1 - Zero
    • 2 - Replace
    • 3 - IncrSat
    • 4 - DecrSat
    • 5 - Invert
    • 6 - IncrWrap
    • 7 - DecrWrap
    Thomas-Mountainborn likes this.
  2. Gambit-MSplitz


    May 16, 2015
    Thank you so much! This should really be somewhere easy to find in the docs... maybe even the shaderlab page.
  3. Alex_May


    Dec 29, 2013
    Good spot - thanks for reporting it and doing the research. I've added it to our list.
  4. Aras


    Graphics Plumber Unity Technologies

    Nov 7, 2005