glHint man page on MacOSX
[printable version]
GLHINT(3G) OpenGL 3.3 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 © 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/.
OpenGL 3.3 03/08/2011 GLHINT(3G)
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