HP Workstation zx2000 OpenGL 1.1 Reference for HP-UX 11.x - Page 226

H glHint 226 glHint glHint: specify implementation-specific hints. C Specification void glHint( GLenum target, GLenum mode) Parameters target mode Specifies a symbolic constant indicating the behavior to be controlled. GL_FOG_HINT, GL_LINE_SMOOTH_HINT, GL_PERSPECTIVE_CORRECTION_HINT, GL_POINT_SMOOTH_HINT, and GL_POLYGON_SMOOTH_HINT are accepted. Specifies a symbolic constant indicating the desired behavior. GL_FASTEST, GL_NICEST, and GL_DONT_CARE are accepted. Description Certain aspects of GL behavior, when there is room for interpretation, can be controlled with hints. A hint is specified with two arguments. target is a symbolic constant indicating the behavior to be controlled, and mode is another symbolic constant indicating the desired behavior. The initial value for each target is GL_DONT_CARE. mode can be one of the following: GL_FASTEST The most efficient option should be chosen. GL_NICEST The most correct, or highest quality, option should be chosen. GL_DONT_CARE No preference. Though the implementation aspects that can be hinted are well defined, the interpretation of the hints depends on the implementation. The hint aspects that can be specified with target, along with suggested semantics, are as follows: GL_FOG_HINT Indicates the accuracy of fog calculation. If per-pixel fog calculation is not efficiently supported by the GL implementation, hinting GL_DONT_CARE or GL_FASTEST can result in per-vertex calculation of fog effects. GL_LINE_SMOOTH_HINT Indicates the sampling quality of anti-aliased lines. If a larger filter function is applied, hinting GL_NICEST can result in more pixel fragments being generated during rasterization, Chapter 8