glViewport man page on Oracle
[printable version]
GLVIEWPORT(3G) OpenGL Manual GLVIEWPORT(3G)
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
SEE ALSO
glDepthRange()
COPYRIGHT
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/.
AUTHORS
opengl.org
opengl.org 04/29/2014 GLVIEWPORT(3G)
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