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View Full Version : glStencilOp's GL_INCR & GL_DECR behaviour when masked?



Izhido
04-25-2000, 08:57 PM
Hi everybody!

What happens to a stencil index value in the stencil buffer when I specify GL_INCR or
GL_DECR as the stencil operations to do with glStencilOp() for any of the stencil tests,
if I call glStencilMask() with a mask value different than all 1's? Does the stencil
index gets just incremented/decremented? Or the value is gathered, incremented/decremented,
and then masked to be written again to the stencil buffer? The OpenGL specification is
not very clear (at least for me) on this, so I hope anyone of you can answer me that.

- Heriberto Delgado
(ioscori@crosswinds.net,
heribertod@sui-generis.net)