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Showing content from https://www.khronos.org/opengles/sdk/docs/man3/html/glHint.xhtml below:

OpenGL ES 3 Reference Pages

glHint — specify implementation-specific hints

 

target

Specifies a symbolic constant indicating the behavior to be controlled. GL_FRAGMENT_SHADER_DERIVATIVE_HINT, and GL_GENERATE_MIPMAP_HINT are accepted.

mode

Specifies a symbolic constant indicating the desired behavior. GL_FASTEST, GL_NICEST, and 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 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_GENERATE_MIPMAP_HINT

Indicates the quality of filtering when generating mipmap images with glGenerateMipmap.

The interpretation of hints depends on the implementation. Some implementations ignore glHint settings.

GL_INVALID_ENUM is generated if either target or mode is not an accepted value.

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