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GLVIEWPORT(3G) [FIXME: 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

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 http://oss.sgi.com/projects/FreeB/.

COPYRIGHT

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

08/09/2021 [FIXME: source]