Added MesaLib-7.6

1 files changed, 165 insertions, 0 deletions

diff --git a/mesalib/src/glu/sgi/libnurbs/internals/hull.cc b/mesalib/src/glu/sgi/libnurbs/internals/hull.cc
new file mode 100644
index 000000000..389ba66fb
--- /dev/null
+++ b/mesalib/src/glu/sgi/libnurbs/internals/hull.cc
@@ -0,0 +1,165 @@
+/*
+** License Applicability. Except to the extent portions of this file are
+** made subject to an alternative license as permitted in the SGI Free
+** Software License B, Version 1.1 (the "License"), the contents of this
+** file are subject only to the provisions of the License. You may not use
+** this file except in compliance with the License. You may obtain a copy
+** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
+** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
+**
+** http://oss.sgi.com/projects/FreeB
+**
+** Note that, as provided in the License, the Software is distributed on an
+** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
+** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
+** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
+** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
+**
+** Original Code. The Original Code is: OpenGL Sample Implementation,
+** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
+** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
+** Copyright in any portions created by third parties is as indicated
+** elsewhere herein. All Rights Reserved.
+**
+** Additional Notice Provisions: The application programming interfaces
+** established by SGI in conjunction with the Original Code are The
+** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
+** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
+** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
+** Window System(R) (Version 1.3), released October 19, 1998. This software
+** was created using the OpenGL(R) version 1.2.1 Sample Implementation
+** published by SGI, but has not been independently verified as being
+** compliant with the OpenGL(R) version 1.2.1 Specification.
+*/
+
+/*
+ * hull.c++
+ *
+ */
+
+#include "glimports.h"
+#include "myassert.h"
+#include "mystdio.h"
+#include "hull.h"
+#include "gridvertex.h"
+#include "gridtrimvertex.h"
+#include "gridline.h"
+#include "trimline.h"
+#include "uarray.h"
+#include "trimregion.h"
+
+Hull::Hull( void )
+{}
+
+Hull::~Hull( void )
+{}
+
+/*----------------------------------------------------------------------
+ * Hull:init - this routine does the initialization needed before any
+ *	 	calls to nextupper or nextlower can be made.
+ *----------------------------------------------------------------------
+ */
+void
+Hull::init( void )
+{
+    TrimVertex *lfirst = left.first();
+    TrimVertex *llast = left.last();
+    if( lfirst->param[0] <= llast->param[0] ) {
+	fakeleft.init( left.first() );
+	upper.left = &fakeleft;
+	lower.left = &left;
+    } else {
+	fakeleft.init( left.last() );
+	lower.left = &fakeleft;
+ 	upper.left = &left;
+    }
+    upper.left->last();
+    lower.left->first();
+
+    if( top.ustart <= top.uend ) {
+	upper.line = &top;
+	upper.index = top.ustart;
+    } else
+	upper.line = 0;
+
+    if( bot.ustart <= bot.uend ) {
+	lower.line = &bot;
+	lower.index = bot.ustart;
+    } else
+	lower.line = 0;
+
+    TrimVertex *rfirst = right.first();
+    TrimVertex *rlast = right.last();
+    if( rfirst->param[0] <= rlast->param[0] ) {
+	fakeright.init( right.last() );
+	lower.right = &fakeright;
+	upper.right = &right;
+    } else {
+	fakeright.init( right.first() );
+	upper.right = &fakeright;
+	lower.right = &right;
+    }
+    upper.right->first();
+    lower.right->last();
+}
+
+/*----------------------------------------------------------------------
+ * nextupper - find next vertex on upper hull of trim region.
+ *		 - if vertex is on trim curve, set vtop point to 
+ *		   that vertex.  if vertex is on grid, set vtop to
+ *		   point to temporary area and stuff coordinants into
+ *		   temporary vertex.  Also, place grid coords in temporary
+ *		   grid vertex.
+ *----------------------------------------------------------------------
+ */
+GridTrimVertex *
+Hull::nextupper( GridTrimVertex *gv )
+{
+    if( upper.left ) {
+	gv->set( upper.left->prev() );
+	if( gv->isTrimVert() ) return gv;
+	upper.left = 0;
+    } 
+
+    if( upper.line ) {
+	assert( upper.index <= upper.line->uend );
+	gv->set( uarray.uarray[upper.index], upper.line->vval );
+	gv->set( upper.index, upper.line->vindex );
+	if( upper.index++ == upper.line->uend ) upper.line = 0;
+	return gv; 
+    } 
+
+    if( upper.right ) {
+	gv->set( upper.right->next() );
+	if( gv->isTrimVert() ) return gv;
+	upper.right = 0;
+    } 
+
+    return 0; 
+}
+
+GridTrimVertex *
+Hull::nextlower( register GridTrimVertex *gv )
+{
+    if( lower.left ) {
+	gv->set( lower.left->next() );
+	if( gv->isTrimVert() ) return gv;
+	lower.left = 0;
+    } 
+
+    if( lower.line ) {
+	gv->set( uarray.uarray[lower.index], lower.line->vval );
+	gv->set( lower.index, lower.line->vindex );
+	if( lower.index++ == lower.line->uend ) lower.line = 0;
+	return gv;
+    } 
+
+    if( lower.right ) {
+	gv->set( lower.right->prev() );
+	if( gv->isTrimVert() ) return gv;
+	lower.right = 0;
+    } 
+
+    return 0;
+}
+