glviewportarray(3g) [centos man page]

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 (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/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						       GLVIEWPORTARRAY(3G)

Check Out this Related Man Page

GLDEPTHRANGEINDEXED(3G) 					   OpenGL Manual					   GLDEPTHRANGEINDEXED(3G)

NAME

       glDepthRangeIndexed - specify mapping of depth values from normalized device coordinates to window coordinates for a specified viewport

C SPECIFICATION

       void glDepthRangeIndexed(GLuint index, GLdouble nearVal, GLdouble farVal);

PARAMETERS

       index
	   Specifies the index of the viewport whose depth range to update.

       nearVal
	   Specifies the mapping of the near clipping plane to window coordinates. The initial value is 0.

       farVal
	   Specifies the mapping of the far clipping plane to window coordinates. The initial value is 1.

DESCRIPTION

       After clipping and division by w, depth coordinates range from -1 to 1, corresponding to the near and far clipping planes. Each viewport
       has an independent depth range specified as a linear mapping of the normalized depth coordinates in this range to window depth coordinates.
       Regardless of the actual depth buffer implementation, window coordinate depth values are treated as though they range from 0 through 1
       (like color components).  glDepthRangeIndexed specifies a linear mapping of the normalized depth coordinates in this range to window depth
       coordinates for a specified viewport. Thus, the values accepted by glDepthRangeIndexed are both clamped to this range before they are
       accepted.

       The index parameter specifies the index of first viewport whose depth range to modify and must be less than the value of GL_MAX_VIEWPORTS.
       nearVal and farVal specify near and far values of the depth range for the specified viewport, respectively.

       The setting of (0,1) maps the near plane to 0 and the far plane to 1. With this mapping, the depth buffer range is fully utilized.

NOTES

       It is not necessary that the near plane distance be less than the far plane distance. Reverse mappings such as nearVal = 1, and farVal = 0
       are acceptable.

       The type of the nearVal and farVal parameters was changed from GLclampd to GLdouble. This change is transparent to user code and is
       described in detail on the removedTypes() page.

ERRORS

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

ASSOCIATED GETS

       glGet() with argument GL_DEPTH_RANGE

SEE ALSO

       glDepthFunc(), glDepthRange(), glDepthRangeArray(), glPolygonOffset(), glViewportArray(), glViewport(), removedTypes()

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/.

AUTHORS

       opengl.org

opengl.org							    06/10/2014						   GLDEPTHRANGEINDEXED(3G)

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glviewportarray(3g) [centos man page]

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