GLDEPTHRANGE() GLDEPTHRANGE() NAME glDepthRange - specify mapping of depth values from normalized device coor- dinates to window coordinates C SPECIFICATION void glDepthRange( GLclampd zNear, GLclampd zFar ) delim $$ PARAMETERS zNear Specifies the mapping of the near clipping plane to window coordi- nates. The initial value is 0. zFar Specifies the mapping of the far clipping plane to window coordi- nates. 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 win- dow depth coordinates. Regardless of the actual depth buffer implementa- tion, 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 zNear be less than zFar. Reverse mappings such as $"zNear" = 1$, and $"zFar" = 0$ are acceptable. ERRORS GL_INVALID_OPERATION is generated if glDepthRange is executed between the execution of glBegin and the corresponding execution of glEnd. ASSOCIATED GETS glGet with argument GL_DEPTH_RANGE SEE ALSO glDepthFunc, glPolygonOffset, glViewport GLDEPTHRANGE()
NAME | C SPECIFICATION | PARAMETERS | DESCRIPTION | NOTES | ERRORS | ASSOCIATED GETS | SEE ALSO
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