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 di‐
            mensions of that window.

DESCRIPTION
       glScissor defines a rectangle, called the scissor box, in window coordi‐
       nates.   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 mod‐
       ified  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 glScis‐
       sor(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  in‐
       cludes the entire window.

ERRORS
       GL_INVALID_VALUE is generated if either width or height is negative.

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

ASSOCIATED GETS
       glGet with argument GL_SCISSOR_BOX
       glIsEnabled with argument GL_SCISSOR_TEST

SEE ALSO
       glEnable, glViewport

                                                                  GLSCISSOR(3G)