glviewport(3g) [redhat man page]

GLVIEWPORT(3G)															    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 dimen-
	    sions of that window.

DESCRIPTION

       glViewport specifies the affine transformation of x and y from normalized device coordinates to window coordinates.  Let (xnd, ynd) be nor-
       malized device coordinates.  Then the window coordinates (xw, yw) are computed as follows:

								   xw=(xnd+1)(_____)+x

								  yw=(ynd+1)(______)+y

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

ERRORS

       GL_INVALID_VALUE is generated if either width or height is negative.

       GL_INVALID_OPERATION is generated if glViewport is executed between the execution of glBegin and the corresponding execution of glEnd.

ASSOCIATED GETS

       glGet with argument GL_VIEWPORT
       glGet with argument GL_MAX_VIEWPORT_DIMS

SEE ALSO

       glDepthRange(3G)

																    GLVIEWPORT(3G)

GLVIEWPORT(3G)							    OpenGL 3.3							    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 (C) 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/.

OpenGL 3.3							    03/08/2011							    GLVIEWPORT(3G)