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glHint

The glHint function specifies implementation-specific hints.

void glHint(
  GLenum target,
  GLenum mode
);

Parameters

target
A symbolic constant indicating the behavior to be controlled. The following symbolic constants, along with suggested semantics, are accepted:
Value Meaning
GL_FOG_HINT Indicates the accuracy of fog calculation. If per-pixel fog calculation is not efficiently supported by the OpenGL 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. Hinting GL_NICEST can result in more pixel fragments being generated during rasterization, if a larger filter function is applied.
GL_PERSPECTIVE_CORRECTION_HINT Indicates the quality of color and texture coordinate interpolation. If perspective-corrected parameter interpolation is not efficiently supported by the OpenGL 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. Hinting GL_NICEST can result in more pixel fragments being generated during rasterization, if a larger filter function is applied.
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.

mode
A symbolic constant indicating the desired behavior. The following symbolic constants are accepted:
Constant Description
GL_FASTEST The most efficient option should be chosen.
GL_NICEST The most correct, or highest quality, option should be chosen.
GL_DONT_CARE The client doesn't have a preference.

Remarks

When there is room for interpretation, you can control certain aspects of OpenGL behavior with hints. You specify a hint with two arguments. The target parameter is a symbolic constant indicating the behavior to be controlled, and mode is another symbolic constant indicating the desired behavior.

Though the implementation aspects that can be hinted are well defined, the interpretation of the hints depends on the implementation.

The glHint function can be ignored.

Error Codes

The following are the error codes generated and their conditions.

Error code Condition
GL_INVALID_ENUM target or mode was not an accepted value.
GL_INVALID_OPERATION glHint was called between a call to glBegin and the corresponding call to glEnd.

Requirements

  Windows NT/2000: Requires Windows NT 3.5 or later.
  Windows 95/98: Requires Windows 95 or later. Available as a redistributable for Windows 95.
  Header: Declared in Gl.h.
  Library: Use Opengl32.lib.

See Also

glBegin, glEnd


  

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