1GLVIEWPORT(3G)                   OpenGL Manual                  GLVIEWPORT(3G)
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NAME

6       glViewport - set the viewport
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C SPECIFICATION

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

12       x, y
13           Specify the lower left corner of the viewport rectangle, in pixels.
14           The initial value is (0,0).
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16       width, height
17           Specify the width and height of the viewport. When a GL context is
18           first attached to a window, width and height are set to the
19           dimensions of that window.
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DESCRIPTION

22       glViewport specifies the affine transformation of x and y from
23       normalized device coordinates to window coordinates. Let x nd y nd be
24       normalized device coordinates. Then the window coordinates x w y w are
25       computed as follows:
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27       x w = x nd + 1 ⁢ width 2 + x
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29       y w = y nd + 1 ⁢ height 2 + y
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31       Viewport width and height are silently clamped to a range that depends
32       on the implementation. To query this range, call glGet() with argument
33       GL_MAX_VIEWPORT_DIMS.
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ERRORS

36       GL_INVALID_VALUE is generated if either width or height is negative.
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ASSOCIATED GETS

39       glGet() with argument GL_VIEWPORT
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41       glGet() with argument GL_MAX_VIEWPORT_DIMS
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SEE ALSO

44       glDepthRange()
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47       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
48       under the SGI Free Software B License. For details, see
49       http://oss.sgi.com/projects/FreeB/.
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AUTHORS

52       opengl.org
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56opengl.org                        06/10/2014                    GLVIEWPORT(3G)
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