glHint(3G)glHint(3G)NAMEglHint - 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)