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

glGet() with argument GL_DEPTH_RANGE

voidglDepthRange(GLdoublenearVal,GLdoublefarVal);voidglDepthRangef(GLfloatnearVal,GLfloatfarVal);

       Copyright © 1991-2006 Silicon Graphics, Inc.
       Copyright © 2010-2014 Khronos Group

[FIXME: source]                                    11/18/2024                                   GLDEPTHRANGE(3G)

       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.

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

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

       The type of the nearVal and farVal parameters was changed from GLclampf to GLfloat for glDepthRangef and
       from GLclampd to GLdouble for glDepthRange. This change is transparent to user code and is described in
       detail on the removedTypes() page.

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.

glDepthFunc(), glPolygonOffset(), glViewport(), removedTypes()

       ┌───────────────┬───────────────────────────────────────────────────────────────────────┐
       │               │                OpenGLVersion                                         │
       ├───────────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
       │ Function      │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
       │ /             │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Feature       │     │     │     │     │     │     │     │     │     │     │     │     │
       │ Name          │     │     │     │     │     │     │     │     │     │     │     │     │
       ├───────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glDepthRange  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       ├───────────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
       │ glDepthRangef │  -  │  -  │  -  │  -  │  -  │  -  │  -  │  ✔  │  ✔  │  ✔  │  ✔  │  ✔  │
       └───────────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘