glDepthRange

Name

glDepthRange â specify mapping of depth values from normalized device coordinates to window coordinates

C Specification

`void glDepthRange(`	GLclampd Â	`nearVal`,
Â	GLclampd Â	`farVal)`;

Parameters

nearVal: + Specifies the mapping of the near clipping plane to window coordinates. + The initial value is 0. +
farVal: + Specifies the mapping of the far clipping plane to window coordinates. + The initial value is 1. +

Description

+ After clipping and division by w, + depth coordinates range from + + + -1 + + to 1, + corresponding to the near and far clipping planes. + glDepthRange specifies a linear mapping of the normalized depth coordinates + in this range to window depth coordinates. + Regardless of the actual depth buffer implementation, + window coordinate depth values are treated as though they range + from 0 through 1 (like color components). + Thus, + the values accepted by glDepthRange are both clamped to this range + before they are accepted. +

+ The setting of (0,1) maps the near plane to 0 and + the far plane to 1. + With this mapping, + the depth buffer range is fully utilized. +

Notes

+ It is not necessary that nearVal be less than farVal. + Reverse mappings such as + + + + nearVal + = + 1 + + , + and + + + + farVal + = + 0 + + + are acceptable. +

Associated Gets

+ glGet with argument GL_DEPTH_RANGE +