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GLHINT(3G)				  OpenGL Manual 			       GLHINT(3G)

NAME
       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_LINE_SMOOTH_HINT, GL_POLYGON_SMOOTH_HINT, GL_TEXTURE_COMPRESSION_HINT, and
	   GL_FRAGMENT_SHADER_DERIVATIVE_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_FRAGMENT_SHADER_DERIVATIVE_HINT

	   Indicates the accuracy of the derivative calculation for the GL shading language
	   fragment processing built-in functions: dFdx, dFdy, and fwidth.

       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.

       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.

       GL_TEXTURE_COMPRESSION_HINT

	   Indicates the quality and performance of the compressing texture images. Hinting
	   GL_FASTEST indicates that texture images should be compressed as quickly as possible,
	   while GL_NICEST indicates that texture images should be compressed with as little
	   image quality loss as possible.  GL_NICEST should be selected if the texture is to be
	   retrieved by glGetCompressedTexImage() for reuse.

NOTES
       The interpretation of hints depends on the implementation. Some implementations ignore
       glHint settings.

ERRORS
       GL_INVALID_ENUM is generated if either target or mode is not an accepted value.

COPYRIGHT
       Copyright (C) 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI
       Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org				    06/10/2014				       GLHINT(3G)
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