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 © 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