GLVIEWPORT

Section: [FIXME: manual] (3G)
Updated: 01/28/2020
Page Index
 

NAME

glViewport - set the viewport  

C SPECIFICATION

void glViewport(GLint x, GLint y, GLsizei width, GLsizei height);
 

PARAMETERS

x, y

Specify the lower left corner of the viewport rectangle, in pixels. The initial value is (0,0).

width, height

Specify the width and height of the viewport. When a GL context is first attached to a window, width and height are set to the dimensions of that window.
 

DESCRIPTION

glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates. Let x nd y nd be normalized device coordinates. Then the window coordinates x w y w are computed as follows:

x w = x nd + 1 ⁢ width 2 + x

y w = y nd + 1 ⁢ height 2 + y

Viewport width and height are silently clamped to a range that depends on the implementation. To query this range, call glGet() with argument GL_MAX_VIEWPORT_DIMS.  

ERRORS

GL_INVALID_VALUE is generated if either width or height is negative.  

ASSOCIATED GETS

glGet() with argument GL_VIEWPORT

glGet() with argument GL_MAX_VIEWPORT_DIMS  

VERSION SUPPORT

OpenGL Version
Function / Feature Name 2.0 2.1 3.0 3.1 3.2 3.3 4.0 4.1 4.2 4.3 4.4 4.5
glViewport

 

SEE ALSO

glDepthRange()  

COPYRIGHT

Copyright © 1991-2006 Silicon Graphics, Inc. Copyright © 2010-2014 Khronos Group. This document is licensed under the SGI Free Software B License. For details, see m[blue]http://oss.sgi.com/projects/FreeB/m[].  

COPYRIGHT


Copyright © 1991-2006 Silicon Graphics, Inc.
Copyright © 2010-2014 Khronos Group


 

Index

NAME
C SPECIFICATION
PARAMETERS
DESCRIPTION
ERRORS
ASSOCIATED GETS
VERSION SUPPORT
SEE ALSO
COPYRIGHT
COPYRIGHT
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