glDepthRangef — specify mapping of depth values from normalized device coordinates to window coordinates
Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0.
Specifies the mapping of the far clipping plane to window coordinates. The initial value is 1.
After clipping and division by w,
depth coordinates range from
corresponding to the near and far clipping planes.
glDepthRangef 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).
the values accepted by
glDepthRangef 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.
It is not necessary that
nearVal be less than
Reverse mappings such as
glGet with argument
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