Specifies whether front and/or back stencil state is updated.
Three symbolic constants are valid:
GL_FRONT
,
GL_BACK
, and
GL_FRONT_AND_BACK
.
sfail
Specifies the action to take when the stencil test fails.
Eight symbolic constants are accepted:
GL_KEEP
,
GL_ZERO
,
GL_REPLACE
,
GL_INCR
,
GL_INCR_WRAP
,
GL_DECR
,
GL_DECR_WRAP
, and
GL_INVERT
. The initial value is
GL_KEEP
.
dpfail
Specifies the stencil action when the stencil test passes,
but the depth test fails.
dpfail
accepts the same symbolic constants as
sfail
. The initial value
is
GL_KEEP
.
dppass
Specifies the stencil action when both the stencil test and the depth
test pass, or when the stencil test passes and either there is no
depth buffer or depth testing is not enabled.
dppass
accepts the same symbolic constants as
sfail
. The initial value
is
GL_KEEP
.