glViewport man page on YellowDog

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GLVIEWPORT(3G)							GLVIEWPORT(3G)

NAME
       glViewport - set the viewport

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 pix‐
	    els. 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  normal‐
       ized  device coordinates to window coordinates.	Let (xnd, ynd) be nor‐
       malized device coordinates.  Then the window coordinates (xw,  yw)  are
       computed as follows:

				 xw=(xnd+1)⎝_____⎠+x

				yw=(ynd+1)⎝______⎠+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.

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

ASSOCIATED GETS
       glGet with argument GL_VIEWPORT
       glGet with argument GL_MAX_VIEWPORT_DIMS

SEE ALSO
       glDepthRange(3G)

								GLVIEWPORT(3G)
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