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+/*
+** 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.
+*/
+
+/*
+ * reader.c++
+ *
+ */
+
+#include <stdio.h>
+#include "glimports.h"
+#include "nurbsconsts.h"
+#include "reader.h"
+#include "trimvertex.h"
+#include "simplemath.h"
+
+//when read a pwlCurve, if two consecutive points are the same, then
+//eliminate one of them. This makes the tessellator more robust. The spec
+//assumes the application makes sure there are no redundant points.
+//but in Inspector, the trim curves seem to have redundant points a lot.
+//I guess other similar users may have the same problem.
+
+#define ELIMINATE_REDUNDANT_POINTS
+
+#ifdef ELIMINATE_REDUNDANT_POINTS
+#define equal(x,y) ( glu_abs(x-y) <= 0.00001)
+#endif
+
+#ifdef ELIMINATE_REDUNDANT_POINTS
+O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
+{
+ next = 0;
+ used = 0;
+ owner = 0;
+ pts = trimpts;
+ npts = (int) count;
+ int i;
+
+ /* copy user data into internal trimming data structures */
+ switch( _type ) {
+ case N_P2D: {
+ TrimVertex *v = pts;
+ TrimVertex *prev = NULL;
+ int num = 0;
+ int doit;
+ for(i=0; i<count; i++) {
+ doit = 1;
+ if(prev != NULL)
+ {
+ if(equal(prev->param[0], array[0]) && equal(prev->param[1], array[1]))
+ {
+ doit = 0;
+ }
+ }
+
+ if(doit)
+ {
+ v->param[0] = (REAL) array[0];
+ v->param[1] = (REAL) array[1];
+ prev = v;
+ v++;
+ num++;
+ }
+ array = (INREAL *) (((char *) array) + byte_stride);
+ }
+ npts = num;
+ break;
+ }
+ case N_P2DR: {
+ TrimVertex *v = pts;
+ for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+ v->param[0] = (REAL) array[0] / (REAL) array[2];
+ v->param[1] = (REAL) array[1] / (REAL) array[2];
+ array = (INREAL *) (((char *) array) + byte_stride);
+ }
+ break;
+ }
+ }
+}
+#else
+O_pwlcurve::O_pwlcurve( long _type, long count, INREAL *array, long byte_stride, TrimVertex *trimpts )
+{
+ next = 0;
+ used = 0;
+ owner = 0;
+ pts = trimpts;
+ npts = (int) count;
+
+ /* copy user data into internal trimming data structures */
+ switch( _type ) {
+ case N_P2D: {
+ TrimVertex *v = pts;
+ for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+ v->param[0] = (REAL) array[0];
+ v->param[1] = (REAL) array[1];
+ array = (INREAL *) (((char *) array) + byte_stride);
+ }
+ break;
+ }
+ case N_P2DR: {
+ TrimVertex *v = pts;
+ for( TrimVertex *lastv = v + count; v != lastv; v++ ) {
+ v->param[0] = (REAL) array[0] / (REAL) array[2];
+ v->param[1] = (REAL) array[1] / (REAL) array[2];
+ array = (INREAL *) (((char *) array) + byte_stride);
+ }
+ break;
+ }
+ }
+}
+#endif
+
+
+
+
+