GLDEPTHFUNC() GLDEPTHFUNC() 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 compari- son is performed only if depth testing is enabled. (See glEnable and glD- isable 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 dis- abled. 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()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | ERRORS | ASSOCIATED GETS | SEE ALSO
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