H
glHint
Chapter 8
226
glHint
glHint: specify implementation-specific hints.
C Specification
void glHint(
GLenum target,
GLenum mode)
Parameters
target 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.
mode 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,
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