glGetTexFilterFuncSGIS(3G)     OpenGL Reference	    glGetTexFilterFuncSGIS(3G)

NAME    [Toc]    [Back]

     glGetTexFilterFuncSGIS - return user-defined texture filtering function

C SPECIFICATION    [Toc]    [Back]

     void glGetTexFilterFuncSGIS( GLenum target,
				  GLenum filter,
				  GLfloat *weights )

PARAMETERS    [Toc]    [Back]

     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    [Toc]    [Back]

     glGetTexFilterFuncSGIS returns in weights the user-defined	filtering
     function specified	by glTexFilterFuncSGIS.	 weights must have Size
     elements, where Size is determined	by calling glGetTexParameter with
     argument GL_TEXTURE_FILTER4_SIZE_SGIS.

NOTES    [Toc]    [Back]

     glGetTexFilterFuncSGIS 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 glGetString when	called with argument
     GL_EXTENSIONS, extension SGIS_texture_filter4 is supported	by the
     connection.  See glIntro for more information about using extensions.

ERRORS    [Toc]    [Back]

     GL_INVALID_ENUM is	generated if either target or filter is	not one	of the
     allowable values.

     GL_INVALID_OPERATION is generated if glGetTexFilterFuncSGIS is executed
     between the execution of glBegin and the corresponding execution of
     glEnd.


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 glTexFilterFuncSGIS does not	equal the
     value of the implementation dependent constant Size, which	can be
     determined	by calling glGetTexParameter with argument
     GL_TEXTURE_FILTER4_SIZE_SGIS.  This restriction will be removed in	a
     future release.




									Page 1






glGetTexFilterFuncSGIS(3G)     OpenGL Reference	    glGetTexFilterFuncSGIS(3G)

SEE ALSO    [Toc]    [Back]

     glTexFilterFuncSGIS, glTexParameter.


									PPPPaaaaggggeeee 2222