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GL
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Method GL.glHint()
- Method
glHint
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void GL.glHint(int target, int mode)
- Description
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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.
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GL_NICEST
| The most correct,
or highest quality,
option should be chosen.
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GL_DONT_CARE
| No preference.
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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.
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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,
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GL_PERSPECTIVE_CORRECTION_HINT
| 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.
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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,
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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.
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- Parameter target
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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.
- Parameter mode
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Specifies a symbolic constant indicating the desired behavior.
GL_FASTEST ,
GL_NICEST , and
GL_DONT_CARE are accepted.
- Throws
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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 .
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