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GLVIEWPORTARRAY(3G)		 OpenGL Manual		   GLVIEWPORTARRAY(3G)

NAME
       glViewportArray - set multiple viewports

C SPECIFICATION
       void glViewportArrayv(GLuint first, GLsizei count, const GLfloat *v);

PARAMETERS
       first
	   Specify the first viewport to set.

       count
	   Specify the number of viewports to set.

       v
	   Specify the address of an array containing the viewport parameters.

DESCRIPTION
       glViewportArrayv specifies the parameters for multiple viewports
       simulataneously.	 first specifies the index of the first viewport to
       modify and count specifies the number of viewports to modify.  first
       must be less than the value of GL_MAX_VIEWPORTS, and first + count must
       be less than or equal to the value of GL_MAX_VIEWPORTS. Viewports whose
       indices lie outside the range [first, first + count) are not modified.
       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.

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

       GL_INVALID_VALUE is generated if first + count 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(), glViewportIndexed()

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			  03/16/2013		   GLVIEWPORTARRAY(3G)

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