glDepthFunc man page on RedHat
[printable version]
GLDEPTHFUNC(3G) OpenGL Manual 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. If depth testing is disabled or if no depth buffer exists, it
is as if the depth test always passes.
NOTES
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. In order to
unconditionally write to the depth buffer, the depth test should be
enabled and set to GL_ALWAYS.
ERRORS
GL_INVALID_ENUM is generated if func is not an accepted value.
ASSOCIATED GETS
glGet() with argument GL_DEPTH_FUNC
glIsEnabled() with argument GL_DEPTH_TEST
SEE ALSO
glDepthRange(), glEnable(), glPolygonOffset()
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
AUTHORS
opengl.org
opengl.org 03/16/2013 GLDEPTHFUNC(3G)
[top]
List of man pages available for RedHat
Copyright (c) for man pages and the logo by the respective OS vendor.
For those who want to learn more, the polarhome community provides shell access and support.
[legal]
[privacy]
[GNU]
[policy]
[cookies]
[netiquette]
[sponsors]
[FAQ]
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
|
|
Vote for polarhome
|
