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GLVIEWPORTINDEXED(3G)		 OpenGL Manual		 GLVIEWPORTINDEXED(3G)

NAME
       glViewportIndexed - set a specified viewport

C SPECIFICATION
       void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w,
			       GLfloat h);

       void glViewportIndexedfv(GLuint index, const GLfloat *v);

PARAMETERS
       index
	   Specify the first viewport to set.

       x, y
	   For glViewportIndexedf, specifies the lower left corner of the
	   viewport rectangle, in pixels. The initial value is (0,0).

       width, height
	   For glViewportIndexedf, specifies 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.

       v
	   For glViewportIndexedfv, specifies the address of an array
	   containing the viewport parameters.

DESCRIPTION
       glViewportIndexedf and glViewportIndexedfv specify the parameters for a
       single viewport.	 index specifies the index of the viewport to modify.
       index must be less than the value of GL_MAX_VIEWPORTS. For
       glViewportIndexedf, x, y, w, and h specify the left, bottom, width and
       height of the viewport in pixels, respectively. For
       glViewportIndexedfv, v contains the address of an array of floating
       point values specifying the left (x), bottom (y), width (w), and height
       (h) of each viewport, in that order.  x and y give the location of the
       viewport's lower left corner, and w and h give the width and height of
       the viewport, respectively. The viewport specifies the affine
       transformation of x and y from normalized device coordinates to window
       coordinates. Let x nd y nd be normalized device coordinates. Then the
       window coordinates x w y w are computed as follows:

       x w = x nd + 1 ⁢ width 2 + x

       y w = y nd + 1 ⁢ height 2 + y

       The location of the viewport's bottom left corner, given by (x, y) is
       clamped to be within the implementaiton-dependent viewport bounds
       range. The viewport bounds range [min, max] can be determined by
       calling glGet() with argument GL_VIEWPORT_BOUNDS_RANGE. 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.

       The precision with which the GL interprets the floating point viewport
       bounds is implementation-dependent and may be determined by querying
       the impementation-defined constant GL_VIEWPORT_SUBPIXEL_BITS.

       Calling glViewportIndexedfv is equivalent to calling glViewportArray()
       with first set to index, count set to 1 and v passsed directly.
       glViewportIndexedf is equivalent to:

	       void glViewportIndexedf(GLuint index, GLfloat x, GLfloat y, GLfloat w, GLfloat h)
	       {
		   const float v[4]  = { x, y, w, h };
		   glViewportArrayv(index, 1, v);
	       }

ERRORS
       GL_INVALID_VALUE is generated if index is greater than or equal to the
       value of GL_MAX_VIEWPORTS.

       GL_INVALID_VALUE is generated if either width or height is negative.

ASSOCIATED GETS
       glGet() with argument GL_VIEWPORT

       glGet() with argument GL_MAX_VIEWPORT_DIMS

       glGet() with argument GL_VIEWPORT_BOUNDS_RANGE

       glGet() with argument GL_VIEWPORT_SUBPIXEL_BITS

SEE ALSO
       glDepthRange(), glViewport(), glViewportArray()

COPYRIGHT
       Copyright © 2010 Khronos Group. This material may be distributed
       subject to the terms and conditions set forth in the Open Publication
       License, v 1.0, 8 June 1999.  http://opencontent.org/openpub/.

AUTHORS
       opengl.org

opengl.org			  04/29/2014		 GLVIEWPORTINDEXED(3G)

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