glDepthFunc — specify the value used for depth buffer comparisons
| ||GLenum func |
Specifies the depth comparison function. Symbolic constants
GL_ALWAYS are accepted. The initial value is
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
func specifies the conditions under which the pixel will be drawn. The comparison functions are as follows:
Passes if the incoming depth value is less than the stored depth value.
Passes if the incoming depth value is equal to the stored depth value.
Passes if the incoming depth value is less than or equal to the stored depth value.
Passes if the incoming depth value is greater than the stored depth value.
Passes if the incoming depth value is not equal to the stored depth value.
Passes if the incoming depth value is greater than or equal to the stored depth value.
The initial value of
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.
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_INVALID_ENUM is generated if
func is not an accepted value.
|Function / Feature Name||2.0||2.1||3.0||3.1||3.2||3.3||4.0||4.1||4.2||4.3||4.4||4.5|
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.