2 ** License Applicability. Except to the extent portions of this file are
3 ** made subject to an alternative license as permitted in the SGI Free
4 ** Software License B, Version 1.1 (the "License"), the contents of this
5 ** file are subject only to the provisions of the License. You may not use
6 ** this file except in compliance with the License. You may obtain a copy
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10 ** http://oss.sgi.com/projects/FreeB
12 ** Note that, as provided in the License, the Software is distributed on an
13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
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18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
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21 ** Copyright in any portions created by third parties is as indicated
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25 ** established by SGI in conjunction with the Original Code are The
26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31 ** published by SGI, but has not been independently verified as being
32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
41 #include "glimports.h"
42 #include "nurbsconsts.h"
44 #include "trimvertex.h"
45 #include "simplemath.h"
47 //when read a pwlCurve, if two consecutive points are the same, then
48 //eliminate one of them. This makes the tessellator more robust. The spec
49 //assumes the application makes sure there are no redundant points.
50 //but in Inspector, the trim curves seem to have redundant points a lot.
51 //I guess other similar users may have the same problem.
53 #define ELIMINATE_REDUNDANT_POINTS
55 #ifdef ELIMINATE_REDUNDANT_POINTS
56 #define equal(x,y) ( glu_abs(x-y) <= 0.00001)
59 #ifdef ELIMINATE_REDUNDANT_POINTS
60 O_pwlcurve::O_pwlcurve( long _type
, long count
, INREAL
*array
, long byte_stride
, TrimVertex
*trimpts
)
70 /* copy user data into internal trimming data structures */
74 TrimVertex
*prev
= NULL
;
77 for(i
=0; i
<count
; i
++) {
81 if(equal(prev
->param
[0], array
[0]) && equal(prev
->param
[1], array
[1]))
89 v
->param
[0] = (REAL
) array
[0];
90 v
->param
[1] = (REAL
) array
[1];
95 array
= (INREAL
*) (((char *) array
) + byte_stride
);
102 for( TrimVertex
*lastv
= v
+ count
; v
!= lastv
; v
++ ) {
103 v
->param
[0] = (REAL
) array
[0] / (REAL
) array
[2];
104 v
->param
[1] = (REAL
) array
[1] / (REAL
) array
[2];
105 array
= (INREAL
*) (((char *) array
) + byte_stride
);
112 O_pwlcurve::O_pwlcurve( long _type
, long count
, INREAL
*array
, long byte_stride
, TrimVertex
*trimpts
)
121 /* copy user data into internal trimming data structures */
125 for( TrimVertex
*lastv
= v
+ count
; v
!= lastv
; v
++ ) {
126 v
->param
[0] = (REAL
) array
[0];
127 v
->param
[1] = (REAL
) array
[1];
128 array
= (INREAL
*) (((char *) array
) + byte_stride
);
134 for( TrimVertex
*lastv
= v
+ count
; v
!= lastv
; v
++ ) {
135 v
->param
[0] = (REAL
) array
[0] / (REAL
) array
[2];
136 v
->param
[1] = (REAL
) array
[1] / (REAL
) array
[2];
137 array
= (INREAL
*) (((char *) array
) + byte_stride
);