glGetMapdv man page on OpenBSD

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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 )

       delim $$

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 $uorder
		      ~times~ vorder$ 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 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)

								 March 1, 2011
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