glViewport man page on Oracle

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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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