glHint man page on OSF1

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glHint(3G)							    glHint(3G)

NAME
       glHint - specify implementation-specific hints

SYNOPSIS
       void glHint(
	       GLenum target,
	       GLenum mode );

PARAMETERS
       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.	Speci‐
       fies 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: The most efficient option should be  chosen.   The  most
       correct, or highest quality, option should be chosen.  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 seman‐
       tics, are as follows: Indicates the accuracy  of	 fog  calculation.  If
       per-pixel fog calculation is not efficiently supported by the GL imple‐
       mentation, hinting GL_DONT_CARE or GL_FASTEST can result in  per-vertex
       calculation   of	 fog  effects.	 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, Indicates the quality of color  and  texture  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.  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,
       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.

NOTES
       The  interpretation of hints depends on the implementation. Some imple‐
       mentations ignore glHint() settings.

ERRORS
       GL_INVALID_ENUM is generated  if	 either	 target	 or  mode  is  not  an
       accepted value.

       GL_INVALID_OPERATION  is	 generated if glHint() is executed between the
       execution of glBegin() and the corresponding execution of glEnd().

								    glHint(3G)
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