fglGetTexFilterFuncSGIS(3G) OpenGL Reference fglGetTexFilterFuncSGIS(3G)NAME
fglGetTexFilterFuncSGIS - return user-defined texture filtering function
FORTRAN SPECIFICATION
SUBROUTINE fglGetTexFilterFuncSGIS( INTEGER*4 target,
INTEGER*4 filter,
CHARACTER*8 weights )
PARAMETERS
target Specifies the target texture whose filtering function weights
are to be returned. Must be GL_TEXTURE_1D or GL_TEXTURE_2D.
filter Specifies the filter function whose weights are to be returned.
Must be GL_FILTER4_SGIS.
weights Specifies an array to receive the floating-point weight values.
DESCRIPTION
fglGetTexFilterFuncSGIS returns in weights the user-defined filtering
function specified by fglTexFilterFuncSGIS. weights must have Size
elements, where Size is determined by calling fglGetTexParameter with
argument GL_TEXTURE_FILTER4_SIZE_SGIS.
NOTES
fglGetTexFilterFuncSGIS is part of the SGIS_texture_filter4 extension,
not part of the core GL command set. If GL_SGIS_texture_filter4 is
included in the string returned by fglGetString when called with argument
GL_EXTENSIONS, extension SGIS_texture_filter4 is supported by the
connection. See fglIntro for more information about using extensions.
ERRORS
GL_INVALID_ENUM is generated if either target or filter is not one of the
allowable values.
GL_INVALID_OPERATION is generated if fglGetTexFilterFuncSGIS is executed
between the execution of fglBegin and the corresponding execution of
fglEnd.
MACHINE DEPENDENCIES
The SGIS_texture_filter4 extension is supported only on InfiniteReality
systems.
On InfiniteReality systems, GL_INVALID_VALUE is generated if the value of
the argument n to the command fglTexFilterFuncSGIS does not equal the
value of the implementation dependent constant Size, which can be
determined by calling fglGetTexParameter with argument
GL_TEXTURE_FILTER4_SIZE_SGIS. This restriction will be removed in a
future release.
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fglGetTexFilterFuncSGIS(3G) OpenGL Reference fglGetTexFilterFuncSGIS(3G)SEE ALSO
fglTexFilterFuncSGIS, fglTexParameter.
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