Manpage of GLDEPTHFUNC
GLDEPTHFUNC
Index
NAME
glDepthFunc
- specify the value used for depth buffer comparisons
C SPECIFICATION
void f3glDepthFuncfP(
GLenum fIfuncfP )
PARAMETERS
- f2funcfP
-
Specifies the depth comparison function.
Symbolic constants
%f3GL_NEVERfP,
%f3GL_LESSfP,
%f3GL_EQUALfP,
%f3GL_LEQUALfP,
%f3GL_GREATERfP,
%f3GL_NOTEQUALfP,
%f3GL_GEQUALfP, and
%f3GL_ALWAYSfP are accepted.
The initial value is %f3GL_LESSfP.
DESCRIPTION
%f3glDepthFuncfP 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 %f3glEnablefP and %f3glDisablefP of %f3GL_DEPTH_TESTfP.)
f2funcfP specifies the conditions under which the pixel will be drawn.
The comparison functions are as follows:
- %f3GL_NEVERfP
-
Never passes.
- %f3GL_LESSfP
-
Passes if the incoming depth value is less than the stored depth value.
- %f3GL_EQUALfP
-
Passes if the incoming depth value is equal to the stored depth value.
- %f3GL_LEQUALfP
-
Passes if the incoming depth value is less than or equal to
the stored depth value.
- %f3GL_GREATERfP
-
Passes if the incoming depth value is greater than the stored depth value.
- %f3GL_NOTEQUALfP
-
Passes if the incoming depth value is not equal to the stored depth value.
- %f3GL_GEQUALfP
-
Passes if the incoming depth value is greater than or equal to
the stored depth value.
- %f3GL_ALWAYSfP
-
Always passes.
The initial value of f2funcfP is %f3GL_LESSfP.
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
%f3GL_INVALID_ENUMfP is generated if f2funcfP is not an accepted value.
%f3GL_INVALID_OPERATIONfP is generated if %f3glDepthFuncfP
is executed between the execution of %f3glBeginfP
and the corresponding execution of %f3glEndfP.
ASSOCIATED GETS
%f3glGetfP with argument %f3GL_DEPTH_FUNCfP
%f3glIsEnabledfP with argument %f3GL_DEPTH_TESTfP
SEE ALSO
%f3glDepthRange(3G)fP,
%f3glEnable(3G)fP,
%f3glPolygonOffset(3G)fP
Index
- NAME
-
- C SPECIFICATION
-
- PARAMETERS
-
- DESCRIPTION
-
- ERRORS
-
- ASSOCIATED GETS
-
- SEE ALSO
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