glDepthRangef

After clipping and division by w , depth coordinates range from $-1$ to 1, 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. If a fixed-point depth representation is used, the parameters n and f are clamped to the range [0, 1] when specified.

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 n be less than f . Reverse mappings such as $\mathit{n}=1$ , and $\mathit{f}=0$ are acceptable.

glGet with argument GL_DEPTH_RANGE

glDepthFunc , glPolygonOffset , glViewport

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