Action
Set function and reference value for stencil testing.
Syntax
StencilFunc func, ref, mask
Remarks
func |
Specifies the test function, one of NEVER, LESS, LEQUAL, GREATER, GEQUAL, EQUAL, NOTEQUAL, or ALWAYS. The initial value is ALWAYS. |
ref |
Specifies the reference value for the stencil test, range 0 to 255, the initial value is 0 |
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 FTPOINTS
Vertex2II 50, 60, 0, 0
Vertex2II 110, 60, 0, 0
StencilFunc EQUAL, 2, 255
ColorRGB 100, 0, 0
Vertex2II 80, 60, 0, 0
