glHint — specify implementation-specific hints
| ||GLenum target,|
|GLenum mode |
Specifies a symbolic constant indicating the behavior to be controlled.
GL_FRAGMENT_SHADER_DERIVATIVE_HINT are accepted.
Specifies a symbolic constant indicating the desired behavior.
GL_DONT_CARE are accepted.
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
mode can be one of the following:
The most efficient option should be chosen.
The most correct, or highest quality, option should be chosen.
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:
Indicates the accuracy of the derivative calculation for the GL shading language fragment processing built-in functions:
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.
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.
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.
The interpretation of hints depends on the implementation. Some implementations ignore
GL_INVALID_ENUM is generated if either
mode is not an accepted value.
|Function / Feature Name||2.0||2.1||3.0||3.1||3.2||3.3||4.0||4.1||4.2||4.3||4.4||4.5|
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