1 /* 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 7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600 8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at: 9 ** 10 ** http://oss.sgi.com/projects/FreeB 11 ** 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 14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND 15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A 16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT. 17 ** 18 ** Original Code. The Original Code is: OpenGL Sample Implementation, 19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics, 20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc. 21 ** Copyright in any portions created by third parties is as indicated 22 ** elsewhere herein. All Rights Reserved. 23 ** 24 ** Additional Notice Provisions: The application programming interfaces 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. 33 */ 34 35 /* 36 * curvelist.c++ 37 * 38 */ 39 40 //#include "glimports.h" 41 //#include "myassert.h" 42 //#include "mystdio.h" 43 #include "quilt.h" 44 #include "curvelist.h" 45 #include "curve.h" 46 //#include "types.h" 47 48 Curvelist::Curvelist( Quilt *quilts, REAL pta, REAL ptb ) 49 { 50 curve = 0; 51 for( Quilt *q = quilts; q; q = q->next ) 52 curve = new Curve( q, pta, ptb, curve ); 53 range[0] = pta; 54 range[1] = ptb; 55 range[2] = ptb - pta; 56 needsSubdivision = 0; 57 stepsize = 0; 58 } 59 60 Curvelist::Curvelist( Curvelist &upper, REAL value ) 61 { 62 curve = 0; 63 for( Curve *c = upper.curve; c; c = c->next ) 64 curve = new Curve( *c, value, curve ); 65 66 range[0] = upper.range[0]; 67 range[1] = value; 68 range[2] = value - upper.range[0]; 69 upper.range[0] = value; 70 upper.range[2] = upper.range[1] - value; 71 needsSubdivision = 0; 72 stepsize = 0; 73 } 74 75 Curvelist::~Curvelist() 76 { 77 while( curve ) { 78 Curve *c = curve; 79 curve = curve->next; 80 delete c; 81 } 82 } 83 84 int 85 Curvelist::cullCheck( void ) 86 { 87 for( Curve *c = curve; c; c = c->next ) 88 if( c->cullCheck() == CULL_TRIVIAL_REJECT ) 89 return CULL_TRIVIAL_REJECT; 90 return CULL_ACCEPT; 91 } 92 93 void 94 Curvelist::getstepsize( void ) 95 { 96 stepsize = range[2]; 97 Curve *c; 98 for( c = curve; c; c = c->next ) { 99 c->getstepsize(); 100 c->clamp(); 101 stepsize = ((c->stepsize < stepsize) ? c->stepsize : stepsize); 102 if( c->needsSamplingSubdivision() ) break; 103 } 104 needsSubdivision = ( c ) ? 1 : 0; 105 } 106 107 int 108 Curvelist::needsSamplingSubdivision( void ) 109 { 110 return needsSubdivision; 111 } 112 113