Gl.Hint (gb.opengl)
Static Sub Hint ( Target As Integer, Mode As Integer )
Specify implementation-specific hints.
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
Gl.GetCompressedTexImage for reuse.
Notes
The interpretation of hints depends on the implementation.
Some implementations ignore
Gl.Hint settings.
Errors
Gl.INVALID_ENUM is generated if either
target or
mode is not
an accepted value.
See original documentation on OpenGL website