1 /* 2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) 3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved. 4 * 5 * Permission is hereby granted, free of charge, to any person obtaining a 6 * copy of this software and associated documentation files (the "Software"), 7 * to deal in the Software without restriction, including without limitation 8 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 9 * and/or sell copies of the Software, and to permit persons to whom the 10 * Software is furnished to do so, subject to the following conditions: 11 * 12 * The above copyright notice including the dates of first publication and 13 * either this permission notice or a reference to 14 * http://oss.sgi.com/projects/FreeB/ 15 * shall be included in all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS 18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, 21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF 22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 23 * SOFTWARE. 24 * 25 * Except as contained in this notice, the name of Silicon Graphics, Inc. 26 * shall not be used in advertising or otherwise to promote the sale, use or 27 * other dealings in this Software without prior written authorization from 28 * Silicon Graphics, Inc. 29 */ 30 31 /* 32 * backend.h 33 * 34 */ 35 36 #ifndef __glubackend_h_ 37 #define __glubackend_h_ 38 39 //#include "trimvertex.h" 40 //#include "gridvertex.h" 41 #include "gridtrimvertex.h" 42 43 class BasicCurveEvaluator; 44 class BasicSurfaceEvaluator; 45 46 class Backend { 47 private: 48 BasicCurveEvaluator& curveEvaluator; 49 BasicSurfaceEvaluator& surfaceEvaluator; 50 public: 51 Backend( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e ) 52 : curveEvaluator(c), surfaceEvaluator(e) {} 53 54 /* surface backend routines */ 55 void bgnsurf( int, int, long ); 56 void patch( REAL, REAL, REAL, REAL ); 57 void surfpts( long, REAL *, long, long, int, int, 58 REAL, REAL, REAL, REAL ); 59 void surfbbox( long, REAL *, REAL * ); 60 void surfgrid( REAL, REAL, long, REAL, REAL, long ); 61 void surfmesh( long, long, long, long ); 62 void bgntmesh( const char * ); 63 void endtmesh( void ); 64 void swaptmesh( void ); 65 void tmeshvert( GridTrimVertex * ); 66 void tmeshvert( TrimVertex * ); 67 void tmeshvert( GridVertex * ); 68 void tmeshvert( REAL u, REAL v ); 69 void linevert( TrimVertex * ); 70 void linevert( GridVertex * ); 71 void bgnoutline( void ); 72 void endoutline( void ); 73 void endsurf( void ); 74 void triangle( TrimVertex*, TrimVertex*, TrimVertex* ); 75 76 void bgntfan(); 77 void endtfan(); 78 void bgnqstrip(); 79 void endqstrip(); 80 void evalUStrip(int n_upper, REAL v_upper, REAL* upper_val, 81 int n_lower, REAL v_lower, REAL* lower_val 82 ); 83 void evalVStrip(int n_left, REAL u_left, REAL* left_val, 84 int n_right, REAL v_right, REAL* right_val 85 ); 86 void tmeshvertNOGE(TrimVertex *t); 87 void tmeshvertNOGE_BU(TrimVertex *t); 88 void tmeshvertNOGE_BV(TrimVertex *t); 89 void preEvaluateBU(REAL u); 90 void preEvaluateBV(REAL v); 91 92 93 /* curve backend routines */ 94 void bgncurv( void ); 95 void segment( REAL, REAL ); 96 void curvpts( long, REAL *, long, int, REAL, REAL ); 97 void curvgrid( REAL, REAL, long ); 98 void curvmesh( long, long ); 99 void curvpt( REAL ); 100 void bgnline( void ); 101 void endline( void ); 102 void endcurv( void ); 103 private: 104 #ifndef NOWIREFRAME 105 int wireframetris; 106 int wireframequads; 107 int npts; 108 REAL mesh[3][4]; 109 int meshindex; 110 #endif 111 }; 112 113 #endif /* __glubackend_h_ */ 114