gldepthrangearray(3g) [debian man page]

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

NAME

       glDepthRangeArray - specify mapping of depth values from normalized device coordinates to window coordinates for a specified set of
       viewports

C SPECIFICATION

       void glDepthRangeArrayv(GLuint first, GLsizei count, const GLdouble *v);

PARAMETERS

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

       count
	   Specifies the number of viewports whose depth range to update.

       v
	   Specifies the address of an array containing the near and far values for the depth range of each modified viewport.

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).  glDepthRangeArray specifies a linear mapping of the normalized depth coordinates in this range to window depth
       coordinates for each viewport in the range [first, first + count). Thus, the values accepted by glDepthRangeArray are both clamped to this
       range before they are accepted.

       The first parameter specifies the index of the first viewport whose depth range to modify and must be less than the value of
       GL_MAX_VIEWPORTS.  count specifies the number of viewports whose depth range to modify.	first + count must be less than or equal to the
       value of GL_MAX_VIEWPORTS.  v specifies the address of an array of pairs of double precision floating point values representing the near
       and far values of the depth range for each viewport, in that order.

       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 near = 1, and far = 0 are
       acceptable.

       The type of the v parameter 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 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.

ASSOCIATED GETS

       glGet() with argument GL_DEPTH_RANGE

SEE ALSO

       glDepthFunc(), glDepthRange(), glDepthRangeIndexed(), 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/.

[FIXME: source] 						    05/30/2012						     GLDEPTHRANGEARRAY(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)

Linux and UNIX Man Pages

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