GlHint
_glHint: specify implementation-specific hints
Syntax
SUB _glHint (BYVAL target AS _UNSIGNED LONG, BYVAL mode AS _UNSIGNED LONG) void _glHint(GLenum target, GLenum mode);
- target
- Specifies a symbolic constant indicating the behavior to be controlled. Template:KW, Template:KW, Template:KW, and Template:KW are accepted.
- mode
- Specifies a symbolic constant indicating the desired behavior. Template:KW, Template:KW, and Template:KW 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 Template:KW. mode can be one of the following:
The most efficient option should be chosen.
The most correct, or highest quality, option should be chosen.
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:
Indicates the accuracy of the derivative calculation for the GL shading language fragment processing built-in functions: Template:KW, Template:KW, and Template:KW.
Indicates the sampling quality of antialiased lines. If a larger filter function is applied, hinting Template:KW can result in more pixel fragments being generated during rasterization.
Indicates the sampling quality of antialiased polygons. Hinting Template:KW 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 Template:KW indicates that texture images should be compressed as quickly as possible, while Template:KW indicates that texture images should be compressed with as little image quality loss as possible. Template:KW should be selected if the texture is to be retrieved by Template:KW for reuse.
The interpretation of hints depends on the implementation. Some implementations ignore _glHint settings.
Template:KW is generated if either target or mode is not an accepted value.
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