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fglGetMap(3G)		       OpenGL Reference			 fglGetMap(3G)

NAME
     fglGetMapdv, fglGetMapfv, fglGetMapiv - return evaluator parameters

FORTRAN SPECIFICATION
     SUBROUTINE fglGetMapdv( INTEGER*4 target,
			     INTEGER*4 query,
			     CHARACTER*8 v )
     SUBROUTINE fglGetMapfv( INTEGER*4 target,
			     INTEGER*4 query,
			     CHARACTER*8 v )
     SUBROUTINE fglGetMapiv( INTEGER*4 target,
			     INTEGER*4 query,
			     CHARACTER*8 v )

PARAMETERS
     target  Specifies the symbolic name of a map.  Accepted values are
	     GL_MAP1_COLOR_4, GL_MAP1_INDEX, GL_MAP1_NORMAL,
	     GL_MAP1_TEXTURE_COORD_1, GL_MAP1_TEXTURE_COORD_2,
	     GL_MAP1_TEXTURE_COORD_3, GL_MAP1_TEXTURE_COORD_4,
	     GL_MAP1_VERTEX_3, GL_MAP1_VERTEX_4, GL_MAP2_COLOR_4,
	     GL_MAP2_INDEX, GL_MAP2_NORMAL, GL_MAP2_TEXTURE_COORD_1,
	     GL_MAP2_TEXTURE_COORD_2, GL_MAP2_TEXTURE_COORD_3,
	     GL_MAP2_TEXTURE_COORD_4, GL_MAP2_VERTEX_3, and GL_MAP2_VERTEX_4.

     query   Specifies which parameter to return.  Symbolic names GL_COEFF,
	     GL_ORDER, and GL_DOMAIN are accepted.

     v	     Returns the requested data.

DESCRIPTION
     fglMap1 and fglMap2 define evaluators.  fglGetMap returns evaluator
     parameters.  target chooses a map, query selects a specific parameter,
     and v points to storage where the values will be returned.

     The acceptable values for the target parameter are described in the
     fglMap1 and fglMap2 reference pages.

     query can assume the following values:

     GL_COEFF	    v returns the control points for the evaluator function.
		    One-dimensional evaluators return order control points,
		    and two-dimensional evaluators return uorder x vorder
		    control points.  Each control point consists of one, two,
		    three, or four integer, single-precision floating-point,
		    or double-precision floating-point values, depending on
		    the type of the evaluator.	The GL returns two-dimensional
		    control points in row-major order, incrementing the uorder
		    index quickly and the vorder index after each row.
		    Integer values, when requested, are computed by rounding
		    the internal floating-point values to the nearest integer

									Page 1

fglGetMap(3G)		       OpenGL Reference			 fglGetMap(3G)

		    values.

     GL_ORDER	    v returns the order of the evaluator function.  One-
		    dimensional evaluators return a single value, order. The
		    initial value is 1.	 Two-dimensional evaluators return two
		    values, uorder and vorder. The initial value is 1,1.

     GL_DOMAIN	    v returns the linear u and v mapping parameters.  One-
		    dimensional evaluators return two values, u1 and u2, as
		    specified by fglMap1.  Two-dimensional evaluators return
		    four values (u1, u2, v1, and v2) as specified by fglMap2.
		    Integer values, when requested, are computed by rounding
		    the internal floating-point values to the nearest integer
		    values.

NOTES
     If an error is generated, no change is made to the contents of v.

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

     GL_INVALID_OPERATION is generated if fglGetMap is executed between the
     execution of fglBegin and the corresponding execution of fglEnd.

SEE ALSO
     fglEvalCoord, fglMap1, fglMap2

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