Sophie: Io-language-graphics-and-sound-20080330-6.fc15 i686

Io-language-graphics-and-sound-20080330-6.fc15.i686.rpm

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     <STRONG>NAME</STRONG>
	  <STRONG>glScissor</STRONG> - define the scissor box


     <STRONG>C</STRONG> <STRONG>SPECIFICATION</STRONG>
	  void <STRONG>glScissor</STRONG>( GLint	<EM>x</EM>,
			  GLint	<EM>y</EM>,
			  GLsizei <EM>width</EM>,
			  GLsizei <EM>height</EM> )


     <STRONG>PARAMETERS</STRONG>
	  <EM>x</EM>, <EM>y</EM> Specify the lower left corner of	the scissor box.
	       Initially (0, 0).

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

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

	  To enable and	disable	the scissor test, call <STRONG>glEnable</STRONG>	and
	  <STRONG>glDisable</STRONG> with argument <STRONG>GL_SCISSOR_TEST</STRONG>. 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)
	  <STRONG>allows</STRONG> <STRONG>modification</STRONG> <STRONG>of</STRONG> <STRONG>only</STRONG> <STRONG>the</STRONG> <STRONG>lower</STRONG>	<STRONG>left</STRONG> <STRONG>pixel</STRONG> <STRONG>in</STRONG> <STRONG>the</STRONG>
	  <STRONG>window,</STRONG> <STRONG>and</STRONG> <STRONG>glScissor(0,0,0,0)</STRONG> 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.

     <STRONG>ERRORS</STRONG>
	  <STRONG>GL_INVALID_VALUE</STRONG> is generated	if either <EM>width</EM>	or <EM>height</EM> is
	  negative.

	  <STRONG>GL_INVALID_OPERATION</STRONG> is generated if <STRONG>glScissor</STRONG> is executed
	  between the execution	of <STRONG>glBegin</STRONG> and the corresponding
	  execution of <STRONG>glEnd</STRONG>.

     <STRONG>ASSOCIATED</STRONG>	<STRONG>GETS</STRONG>
	  <STRONG>glGet</STRONG>	with argument <STRONG>GL_SCISSOR_BOX</STRONG>
	  <STRONG>glIsEnabled</STRONG> with argument <STRONG>GL_SCISSOR_TEST</STRONG>

     <STRONG>SEE</STRONG> <STRONG>ALSO</STRONG>

	  <STRONG>glEnable</STRONG>, <STRONG>glViewport</STRONG>



















































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