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glgetmapiv

GLGETMAP(3G)															      GLGETMAP(3G)

NAME

       glGetMapdv, glGetMapfv, glGetMapiv - return evaluator parameters

C SPECIFICATION

       void glGetMapdv( GLenum target,
			GLenum query,
			GLdouble *v )
       void glGetMapfv( GLenum target,
			GLenum query,
			GLfloat *v )
       void glGetMapiv( GLenum target,
			GLenum query,
			GLint *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

       glMap1 and glMap2 define evaluators.  glGetMap 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 glMap1 and glMap2 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 uorderxvorder control points.  Each control point consists of one, two, three, or  four  inte-
		      ger,  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 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
		      glMap1.  Two-dimensional evaluators return four values (u1, u2, v1, and v2) as specified by glMap2.   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 glGetMap is executed between the execution of glBegin and the corresponding execution of glEnd.

SEE ALSO

       glEvalCoord(3G), glMap1(3G), glMap2(3G)

																      GLGETMAP(3G)

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