Name
gl.Hint -- specify implementation-specific hints
Synopsis
gl.Hint(target, mode)
Function
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 antialiased lines. If a larger filter function is applied, hinting #GL_NICEST can result in more pixel fragments being generated during rasterization.

#GL_PERSPECTIVE_CORRECTION_HINT
Indicates the quality of color, texture coordinate, and fog coordinate interpolation. If perspective-corrected parameter interpolation is not efficiently supported by the GL implementation, hinting #GL_DONT_CARE or #GL_FASTEST can result in simple linear interpolation of colors and/or texture coordinates.

#GL_POINT_SMOOTH_HINT
Indicates the sampling quality of antialiased points. If a larger filter function is applied, hinting #GL_NICEST can result in more pixel fragments being generated during rasterization.

#GL_POLYGON_SMOOTH_HINT
Indicates the sampling quality of antialiased polygons. Hinting #GL_NICEST can result in more pixel fragments being generated during rasterization, if a larger filter function is applied.

The interpretation of hints depends on the implementation. Some implementations ignore gl.Hint() settings.

Please consult an OpenGL reference manual for more information.

Inputs
target
specifies a symbolic constant indicating the behavior to be controlled (see above for possible values)
mode
specifies a symbolic constant indicating the desired behavior; #GL_FASTEST, #GL_NICEST, and #GL_DONT_CARE are accepted
Errors
#GL_INVALID_ENUM is generated if either target or mode is not an accepted value.

#GL_INVALID_OPERATION is generated if gl.Hint() is executed between the execution of gl.Begin() and the corresponding execution of gl.End() .

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