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