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glhint(3g) [osx man page]

GLHINT(3G)																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_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  argu-
       ments.	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 imple-
			   mentation, 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.  If a larger filter function is  applied,  hinting  GL_NICEST  can
			   result in more pixel fragments being generated during rasterization,

       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.

       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,

       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.

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.

       GL_INVALID_OPERATION is generated if glHint is executed between the execution of glBegin and the corresponding execution of glEnd.

																	GLHINT(3G)

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GLHINT(3G)							  [FIXME: 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/.

[FIXME: source] 						    05/30/2012								GLHINT(3G)
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