glMapGrid — define a one- or two-dimensional mesh
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) ; |
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
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
glMapGrid2
only).
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
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
glMapGrid2
specifies two such linear mappings.
One maps integer grid coordinate
u1
,
and integer grid coordinate
u2
.
The other maps integer grid coordinate
v1
,
and integer grid coordinate
v2
.
Other integer grid coordinates
The mappings specified by glMapGrid
are used identically by
glEvalMesh and glEvalPoint.
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 execution of glEnd.
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
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.