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glviewportarray(3g) [debian man page]

GLVIEWPORTARRAY(3G)						  [FIXME: 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 (C) 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/.

[FIXME: source] 						    05/30/2012						       GLVIEWPORTARRAY(3G)

Check Out this Related Man Page

GLSCISSORINDEXED(3G)						  [FIXME: manual]					      GLSCISSORINDEXED(3G)

NAME

       glScissorIndexed - define the scissor box for a specific viewport

C SPECIFICATION

       void glScissorIndexed(GLuint index, GLint left, GLint bottom, GLsizei width, GLsizei height);

       void glScissorIndexedv(GLuint index, const GLint *v);

PARAMETERS

       index
	   Specifies the index of the viewport whose scissor box to modify.

       left, bottom
	   Specify the coordinate of the bottom left corner of the scissor box, in pixels.

       width, height
	   Specify ths dimensions of the scissor box, in pixels.

       v
	   For glScissorIndexedv, specifies the address of an array containing the left, bottom, width and height of each scissor box, in that
	   order.

DESCRIPTION

       glScissorIndexed defines the scissor box for a specified viewport.  index specifies the index of scissor box to modify.	index must be less
       than the value of GL_MAX_VIEWPORTS. For glScissorIndexed, left, bottom, width and height specify the left, bottom, width and height of the
       scissor box, in pixels, respectively. For glScissorIndexedv, v specifies the address of an array containing integers specifying the lower
       left corner of the scissor box, and the width and height of the scissor box, in that order.

       To enable and disable the scissor test, call glEnable() and glDisable() with argument GL_SCISSOR_TEST. The test is initially disabled for
       all viewports. 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 window.

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

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 any width or height specified in the array v is negative.

ASSOCIATED GETS

       glGet() with argument GL_SCISSOR_BOX

       glIsEnabled() with argument GL_SCISSOR_TEST

SEE ALSO

       glEnable(), glScissor(), glScissorArray()

COPYRIGHT

       Copyright (C) 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/.

[FIXME: source] 						    05/30/2012						      GLSCISSORINDEXED(3G)
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