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Table of Contents
glMapGrid1d, glMapGrid1f, glMapGrid2d, glMapGrid2f - 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 )
eqn not supported
- 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).
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
$v$) 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
eqn not supported
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 coordinate
$j~=~"vn"$ exactly to v2. Other integer grid coordinates $i$ and $j$ are
mapped such that
eqn not supported
eqn not supported
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
glEvalCoord(3G)
, glEvalMesh(3G)
,
glEvalPoint(3G)
, glMap1(3G)
, glMap2(3G)
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