1991-2006 Silicon Graphics, Inc. glViewport 3G glViewport set the viewport void glViewport GLint x GLint y GLsizei width GLsizei height 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. 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. GL_INVALID_VALUE is generated if either width or height is negative. glGet with argument GL_VIEWPORT glGet with argument GL_MAX_VIEWPORT_DIMS glDepthRangef 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/.