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glHint function

Applies to: desktop apps only

The glHint function specifies implementation-specific hints.

Syntax

void WINAPI 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.

ValueMeaning
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.

ValueMeaning
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.

 

Return value

This function does not return a value.

Error codes

The following error codes can be retrieved by the glGetError function.

NameMeaning
GL_INVALID_ENUM

target or mode was not an accepted value.

GL_INVALID_OPERATION

The function was called between a call to glBegin and the corresponding call to glEnd.

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.

Requirements

Minimum supported client

Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Header

Gl.h

Library

Opengl32.lib

DLL

Opengl32.dll

See also

glBegin
glEnd

 

 

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Build date: 3/6/2012

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