table of contents
GLDEPTHFUNC(3G) | [FIXME: manual] | GLDEPTHFUNC(3G) |
NAME¶
glDepthFunc - specify the value used for depth buffer comparisonsC SPECIFICATION¶
void
glDepthFunc(GLenum func);
PARAMETERS¶
funcSpecifies 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¶
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¶
ASSOCIATED GETS¶
SEE ALSO¶
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/.05/30/2012 | [FIXME: source] |