NAME

       glScissor - define the scissor box

C SPECIFICATION

       void glScissor(GLint x, GLint y, GLsizei width, GLsizei height);

PARAMETERS

       x, y
           Specify the lower left corner of the scissor box. Initially (0, 0).

       width, height
           Specify the width and height of the scissor box. When a GL context is first attached
           to a window, width and height are set to the dimensions of that window.

DESCRIPTION

       glScissor defines a rectangle, called the scissor box, in window coordinates. The first
       two arguments, x and y, specify the lower left corner of the box.  width and height
       specify the width and height of the box.

       To enable and disable the scissor test, call glEnable() and glDisable() with argument
       GL_SCISSOR_TEST. The test is initially disabled. While the test is enabled, only pixels
       that lie within the scissor box can be modified by drawing commands. Window coordinates
       have integer values at the shared corners of frame buffer pixels.  glScissor(0,0,1,1)
       allows modification of only the lower left pixel in the window, and glScissor(0,0,0,0)
       doesn't allow modification of any pixels in the window.

       When the scissor test is disabled, it is as though the scissor box includes the entire
       window.

ERRORS

       GL_INVALID_VALUE is generated if either width or height is negative.

ASSOCIATED GETS

       glGet() with argument GL_SCISSOR_BOX

       glIsEnabled() with argument GL_SCISSOR_TEST

SEE ALSO

       glEnable(), glViewport()

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