StencilFunc
From MCS Wiki AVR
Contents |
Action
Set function and reference value for stencil testing.
Syntax
StencilFunc func, ref, mask
Remarks
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func |
Specifies the test function, one of NEVER, LESS, LEQUAL, GREATER, GEQUAL, EQUAL, NOTEQUAL, orALWAYS. The initial value is ALWAYS. |
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ref |
Specifies the reference value for the stencil test, range 0 to 255, the initial value is 0 |
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mask |
Specifies a mask that is ANDed with the reference value and the stored stencil value, range 0 to 255 The initial value is 255 |
Stencil test rejects or accepts pixels depending on the result of the test function defined in func parameter, which operates
on the current value in the stencil buffer against the reference value.
See also
Example
' Pseudocode ' Draw two points, incrementing stencil at each pixel, then draw the pixels with value 2 in red StencilOp INCR, INCR PointSize 760 Begin_G POINTS Vertex2II 50, 60, 0, 0 Vertex2II 110, 60, 0, 0 StencilFunc EQUAL, 2, 255 ColorRGB 100, 0, 0 Vertex2II 80, 60, 0, 0
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