Added MesaLib-7.6

1 files changed, 162 insertions, 0 deletions

diff --git a/mesalib/src/glu/sgi/libnurbs/nurbtess/partitionX.cc b/mesalib/src/glu/sgi/libnurbs/nurbtess/partitionX.cc
new file mode 100644
index 000000000..e25e30b0f
--- /dev/null
+++ b/mesalib/src/glu/sgi/libnurbs/nurbtess/partitionX.cc
@@ -0,0 +1,162 @@
+/*
+** 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.
+**
+*/
+/*
+*/
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#include "partitionX.h"
+
+#define CONCAVITY_ZERO 1.0e-6 //this number is used to test whether a vertex is concave (refelx) 
+                              //or not. The test needs to compute the area of the three adjacent 
+                              //vertices to see if the are is positive or negative. 
+
+Int isCuspX(directedLine *v)
+{
+  //if v->prev <= v && v->next <= v
+  //|| v->prev >= v && v->next >= v
+  Real* T = v->head();
+  Real* P = v->getPrev()->head();
+  Real* N = v->getNext()->head();
+  if(
+     (compV2InX(T,P) != -1 && 
+      compV2InX(T,N) != -1
+      ) ||
+     (compV2InX(T,P) != 1 && 
+      compV2InX(T,N) != 1
+      )
+     )
+    return 1;
+  else
+    return 0;
+}
+
+Int isReflexX(directedLine* v)
+{
+  Real* A = v->getPrev()->head();
+  Real* B = v->head();
+  Real* C = v->tail();
+  Real Bx,By, Cx, Cy;
+  //scale them in case they are too small
+  Bx = 10*(B[0] - A[0]);
+  By = 10*(B[1] - A[1]);
+  Cx = 10*(C[0] - A[0]);
+  Cy = 10*(C[1] - A[1]);
+
+  if(Bx*Cy - Cx*By < -CONCAVITY_ZERO) return 1;
+  else return 0;
+}
+
+
+/*return 
+ *0: not-cusp
+ *1: interior cusp
+ *2: exterior cusp
+ */
+Int cuspTypeX(directedLine *v)
+{
+  if(! isCuspX(v)) return 0;
+  else 
+    {
+//printf("isCusp,%f,%f\n", v->head()[0], v->head()[1]);
+      if(isReflexX(v)) 
+	{
+//	  printf("isReflex\n");
+	  return 1;
+	}
+      else
+	{
+//	  printf("not isReflex\n");
+	  return 2;
+	}
+    }
+}
+
+Int numInteriorCuspsX(directedLine *polygon)
+{
+  directedLine *temp;
+  int ret = 0;
+  if(cuspTypeX(polygon) == 1)
+    ret++;
+  for(temp = polygon->getNext(); temp != polygon; temp = temp->getNext())
+    if(cuspTypeX(temp) == 1)
+      ret++;
+  return ret;
+}
+  
+
+void findInteriorCuspsX(directedLine *polygon, Int& ret_n_interior_cusps,
+			directedLine** ret_interior_cusps)
+{
+  directedLine *temp;
+  ret_n_interior_cusps = 0;
+  if(cuspTypeX(polygon) == 1)
+    {
+      ret_interior_cusps[ret_n_interior_cusps++] = polygon;
+    }
+  for(temp = polygon->getNext(); temp != polygon; temp = temp->getNext())    
+    if(cuspTypeX(temp) == 1)
+      {
+	ret_interior_cusps[ret_n_interior_cusps++] = temp;    
+      }
+}
+
+directedLine* findDiagonal_singleCuspX(directedLine* cusp)
+{
+  directedLine* temp;
+  Int is_minimal = ((compV2InX(cusp->head(), cusp->tail()) == -1)? 1:0);
+
+  if(is_minimal)
+    for(temp = cusp->getNext(); temp != cusp; temp = temp->getNext())
+      {
+	if(compV2InX(cusp->head(), temp->head()) == 1)
+	  {	   
+	    return temp;
+	  }
+      }
+  else //is maxmal 
+    for(temp = cusp->getNext(); temp != cusp; temp = temp->getNext())
+      {
+	if(compV2InX(cusp->head(), temp->head()) == -1)
+	  {	   
+	    return temp;
+	  }
+      }
+  return NULL;
+}
+      
+
+