C SPECIFICATION

       void GLAPIENTRY glMapGrid1d( GLint un,
                                    GLdouble u1,
                                    GLdouble u2 )
       void GLAPIENTRY glMapGrid1f( GLint un,
                                    GLfloat u1,
                                    GLfloat u2 )
       void GLAPIENTRY glMapGrid2d( GLint un,
                                    GLdouble u1,
                                    GLdouble u )
       void GLAPIENTRY glMapGrid2f( GLint un,
                                    GLfloat u1,
                                    GLfloat u )

PARAMETERS

       un  Specifies the number of partitions in the grid range interval  [u1,
           u].  Must be positive.

       u1, u
           Specify the mappings for integer grid domain values i=0 and i=un.

       _param4
           Specifies  the  number  of  partitions  in  the grid range interval
           [_param5, _param6]
           (glMapGrid2 only).

       _param5, _param6
           Specify the mappings for integer grid domain values j=0 and j=_eqn-
           param4
           (glMapGrid2 only).

DESCRIPTION

       glMapGrid  and glEvalMesh are used together to efficiently generate and
       evaluate a series of evenly-spaced map domain values.  glEvalMesh steps
       through  the  integer  domain  of a one- or two-dimensional grid, whose
       range is the domain of the evaluation  maps  specified  by  glMap1  and
       glMap2.

       glMapGrid1  and glMapGrid2 specify the linear grid mappings between the
       i (or i and j) integer grid coordinates, to the u (or u and  v)  float-
       ing-point  evaluation  map  coordinates.   See  glMap1  and  glMap2 for
       details of how u and v coordinates are evaluated.

       glMapGrid1 specifies a single linear mapping  such  that  integer  grid
       coordinate  0  maps  exactly to u1, and integer grid coordinate un maps
       exactly to u.  All other integer grid coordinates i are mapped so that

                                   u=i(u-u1)/un+u1

       GL_INVALID_VALUE  is generated if either un or _param4 is not positive.

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

ASSOCIATED GETS

       glGet with argument GL_MAP1_GRID_DOMAIN
       glGet with argument GL_MAP2_GRID_DOMAIN
       glGet with argument GL_MAP1_GRID_SEGMENTS
       glGet with argument GL_MAP2_GRID_SEGMENTS

SEE ALSO

       glEvalCoord, glEvalMesh, glEvalPoint, glMap1, glMap2



                                                                 GLMAPGRID(3G)