glScissor man page on DigitalUNIX

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glScissor(3G)							 glScissor(3G)

       glScissor - define the scissor box

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

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

       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 win‐

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

       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().

       glGet() with argument GL_SCISSOR_BOX
       glIsEnabled() with argument GL_SCISSOR_TEST

       glEnable(), glViewport()


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