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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.
VERSION SUPPORT
┌─────────┬───────────────────────────────────────────────────────────────────────┐
│ │ OpenGL Version │
├─────────┼─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┬─────┤
│Function │ 2.0 │ 2.1 │ 3.0 │ 3.1 │ 3.2 │ 3.3 │ 4.0 │ 4.1 │ 4.2 │ 4.3 │ 4.4 │ 4.5 │
│/ │ │ │ │ │ │ │ │ │ │ │ │ │
│Feature │ │ │ │ │ │ │ │ │ │ │ │ │
│Name │ │ │ │ │ │ │ │ │ │ │ │ │
├─────────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┼─────┤
│glHint │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │ ✔ │
└─────────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┴─────┘
SEE ALSO
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This
document is licensed under the SGI Free Software B License. For details, see
http://oss.sgi.com/projects/FreeB/.
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group
[FIXME: source] 01/03/2018 GLHINT(3G)