GLMAPGRID


HOME

GLMAPGRID

NAME
C SPECIFICATION
PARAMETERS
DESCRIPTION
ERRORS
ASSOCIATED GETS
SEE ALSO

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 $u$ (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

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

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 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(3G), glEvalMesh(3G), glEvalPoint(3G), glMap1(3G), glMap2(3G)






Opportunity


Personal Opportunity - Free software gives you access to billions of dollars of software at no cost. Use this software for your business, personal use or to develop a profitable skill. Access to source code provides access to a level of capabilities/information that companies protect though copyrights. Open source is a core component of the Internet and it is available to you. Leverage the billions of dollars in resources and capabilities to build a career, establish a business or change the world. The potential is endless for those who understand the opportunity.

Business Opportunity - Goldman Sachs, IBM and countless large corporations are leveraging open source to reduce costs, develop products and increase their bottom lines. Learn what these companies know about open source and how open source can give you the advantage.





Free Software


Free Software provides computer programs and capabilities at no cost but more importantly, it provides the freedom to run, edit, contribute to, and share the software. The importance of free software is a matter of access, not price. Software at no cost is a benefit but ownership rights to the software and source code is far more significant.


Free Office Software - The Libre Office suite provides top desktop productivity tools for free. This includes, a word processor, spreadsheet, presentation engine, drawing and flowcharting, database and math applications. Libre Office is available for Linux or Windows.





Free Books


The Free Books Library is a collection of thousands of the most popular public domain books in an online readable format. The collection includes great classical literature and more recent works where the U.S. copyright has expired. These books are yours to read and use without restrictions.


Source Code - Want to change a program or know how it works? Open Source provides the source code for its programs so that anyone can use, modify or learn how to write those programs themselves. Visit the GNU source code repositories to download the source.





Education


Study at Harvard, Stanford or MIT - Open edX provides free online courses from Harvard, MIT, Columbia, UC Berkeley and other top Universities. Hundreds of courses for almost all major subjects and course levels. Open edx also offers some paid courses and selected certifications.


Linux Manual Pages - A man or manual page is a form of software documentation found on Linux/Unix operating systems. Topics covered include computer programs (including library and system calls), formal standards and conventions, and even abstract concepts.