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
COPYRIGHT
Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see m[blue]http://oss.sgi.com/projects/FreeB/m[].