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Diffstat (limited to 'nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/beginpolygon.gl')
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diff --git a/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/beginpolygon.gl b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/beginpolygon.gl new file mode 100644 index 000000000..74c7ac6c2 --- /dev/null +++ b/nx-X11/extras/ogl-sample/main/doc/man/manglu/standard/beginpolygon.gl @@ -0,0 +1,89 @@ +_C_ License Applicability. Except to the extent portions of this file are +_C_ made subject to an alternative license as permitted in the SGI Free +_C_ Software License B, Version 1.1 (the "License"), the contents of this +_C_ file are subject only to the provisions of the License. You may not use +_C_ this file except in compliance with the License. You may obtain a copy +_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 +_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: +_C_ +_C_ http://oss.sgi.com/projects/FreeB +_C_ +_C_ Note that, as provided in the License, the Software is distributed on an +_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS +_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND +_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A +_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT. +_C_ +_C_ Original Code. The Original Code is: OpenGL Sample Implementation, +_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, +_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. +_C_ Copyright in any portions created by third parties is as indicated +_C_ elsewhere herein. All Rights Reserved. +_C_ +_C_ Additional Notice Provisions: The application programming interfaces +_C_ established by SGI in conjunction with the Original Code are The +_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released +_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version +_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X +_C_ Window System(R) (Version 1.3), released October 19, 1998. This software +_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation +_C_ published by SGI, but has not been independently verified as being +_C_ compliant with the OpenGL(R) version 1.2.1 Specification. +_C_ +_C_ The first character in this file must be an '_'! +_C_ Anything on a line after _C_ is ignored +_define(_filters,eqn)_C_ +_C_ eqn is automatically replaced with neqn for nroff +_header(BeginPolygon, delimit a polygon description) +_names(BeginPolygon) +_names(EndPolygon,,noheader) +.EQ +delim $$ +.EN +.SH PARAMETERS +_phead(_param1) +Specifies the tessellation object (created with _cmnd(NewTess)). +.SH DESCRIPTION +_cmnd(BeginPolygon) and _cmnd(EndPolygon) delimit the definition of a +nonconvex polygon. +To define such a polygon, first call _cmnd(BeginPolygon). +Then define the contours of the polygon +by calling +_cmnd(TessVertex) for each vertex +and _cmnd(NextContour) to start each new contour. +Finally, call _cmnd(EndPolygon) +to signal the end of the definition. +See the _cmnd(TessVertex) and +_cmnd(NextContour) reference pages for more details. +.P +Once _cmnd(EndPolygon) is called, the polygon is tessellated, and the +resulting triangles are described through callbacks. +See _cmnd(TessCallback) for descriptions of the callback functions. +.SH NOTES +This command is obsolete and is provided for backward compatibility +only. Calls to _cmnd(BeginPolygon) are mapped to +_cmnd(TessBeginPolygon) +followed by +_cmnd(TessBeginContour). Calls to _cmnd(EndPolygon) are mapped +to _cmnd(TessEndContour) followed by _cmnd(TessEndPolygon). +.SH EXAMPLE +A quadrilateral with a triangular hole in it can be described like this: +.sp +.Ex +gluBeginPolygon(tobj); + gluTessVertex(tobj, v1, v1); + gluTessVertex(tobj, v2, v2); + gluTessVertex(tobj, v3, v3); + gluTessVertex(tobj, v4, v4); +gluNextContour(tobj, GLU_INTERIOR); + gluTessVertex(tobj, v5, v5); + gluTessVertex(tobj, v6, v6); + gluTessVertex(tobj, v7, v7); +gluEndPolygon(tobj); +.Ee +.SH SEE ALSO +_cmnd(NewTess), _cmnd(NextContour), _cmnd(TessCallback), _cmnd(TessVertex), +_cmnd(TessBeginPolygon), _cmnd(TessBeginContour) + + + |