MirOS Manual: glMapGrid(3), glMapGrid1d(3), glMapGrid1f(3), glMapGrid2d(3), glMapGrid2f(3)


GLMAPGRID(3G)       UNIX Programmer's Manual        GLMAPGRID(3G)

NAME

     glMapGrid1d, glMapGrid1f, glMapGrid2d, glMapGrid2f - define
     a one- or two-dimensional mesh

C SPECIFICATION

     void glMapGrid1d( GLint un,
                       GLdouble u1,
                       GLdouble u2 )
     void glMapGrid1f( GLint un,
                       GLfloat u1,
                       GLfloat u2 )
     void glMapGrid2d( GLint un,
                       GLdouble u1,
                       GLdouble u2,
                       GLint vn,
                       GLdouble v1,
                       GLdouble v2 )
     void glMapGrid2f( GLint un,
                       GLfloat u1,
                       GLfloat u2,
                       GLint vn,
                       GLfloat v1,
                       GLfloat v2 )

PARAMETERS

     un  Specifies the number of partitions in the grid range
         interval [u1, u2]. Must be positive.

     u1, u2
         Specify the mappings for integer grid domain values
         i = 0 and i = un.

     vn  Specifies the number of partitions in the grid range
         interval [v1, v2]
         (glMapGrid2 only).

     v1, v2
         Specify the mappings for integer grid domain values
         j = 0 and j = vn
         (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

MirOS BSD #10-current  Printed 03.04.2017                       1

GLMAPGRID(3G)       UNIX Programmer's Manual        GLMAPGRID(3G)

     u (or u and v) floating-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 u2. All other integer
     grid coordinates i are mapped so that

                         u = i(u2-u1)/un + u1

     glMapGrid2 specifies two such linear mappings. One maps
     integer grid coordinate i = 0 exactly to u1, and integer
     grid coordinate i = un exactly to u2. The other maps integer
     grid coordinate j = 0 exactly to v1, and integer grid coor-
     dinate j = vn exactly to v2. Other integer grid coordinates
     i and j are mapped such that

                         u = i(u2-u1)/un + u1

                         v = j(v2-v1)/vn + v1

     The mappings specified by glMapGrid are used identically by
     glEvalMesh and glEvalPoint.

ERRORS

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

     GL_INVALID_OPERATION is generated if glMapGrid is executed
     between the execution of glBegin and the corresponding exe-
     cution 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(3G), glEvalMesh(3G), glEvalPoint(3G),
     glMap1(3G), glMap2(3G)

MirOS BSD #10-current  Printed 03.04.2017                       2

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