08-24-2011
@Carona688, thanks for pointing that out. Never having used it before, I assumed that -depth works similarly on Unix. Just found out, otherwise. So how would one go about doing something similar in, say, HP-UX?
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LEARN ABOUT MOJAVE
gldepthfunc
GLDEPTHFUNC(3G) GLDEPTHFUNC(3G)
NAME
glDepthFunc - specify the value used for depth buffer comparisons
C SPECIFICATION
void glDepthFunc( GLenum func )
PARAMETERS
func Specifies the depth comparison function. Symbolic constants GL_NEVER, GL_LESS, GL_EQUAL, GL_LEQUAL, GL_GREATER, GL_NOTEQUAL,
GL_GEQUAL, and GL_ALWAYS are accepted. The initial value is GL_LESS.
DESCRIPTION
glDepthFunc specifies the function used to compare each incoming pixel depth value with the depth value present in the depth buffer. The
comparison is performed only if depth testing is enabled. (See glEnable and glDisable of GL_DEPTH_TEST.)
func specifies the conditions under which the pixel will be drawn. The comparison functions are as follows:
GL_NEVER Never passes.
GL_LESS Passes if the incoming depth value is less than the stored depth value.
GL_EQUAL Passes if the incoming depth value is equal to the stored depth value.
GL_LEQUAL Passes if the incoming depth value is less than or equal to the stored depth value.
GL_GREATER Passes if the incoming depth value is greater than the stored depth value.
GL_NOTEQUAL Passes if the incoming depth value is not equal to the stored depth value.
GL_GEQUAL Passes if the incoming depth value is greater than or equal to the stored depth value.
GL_ALWAYS Always passes.
The initial value of func is GL_LESS. Initially, depth testing is disabled. Even if the depth buffer exists and the depth mask is non-
zero, the depth buffer is not updated if the depth test is disabled.
ERRORS
GL_INVALID_ENUM is generated if func is not an accepted value.
GL_INVALID_OPERATION is generated if glDepthFunc is executed between the execution of glBegin and the corresponding execution of glEnd.
ASSOCIATED GETS
glGet with argument GL_DEPTH_FUNC
glIsEnabled with argument GL_DEPTH_TEST
SEE ALSO
glDepthRange, glEnable, glPolygonOffset
GLDEPTHFUNC(3G)