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:
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
14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
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.
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.
40 /* Bezier surface backend
41 - interprets display mode (wireframe,shaded,...)
44 #include "glimports.h"
47 #include "basiccrveval.h"
48 #include "basicsurfeval.h"
53 /*-------------------------------------------------------------------------
54 * bgnsurf - preamble to surface definition and evaluations
55 *-------------------------------------------------------------------------
58 Backend::bgnsurf( int wiretris, int wirequads, long nuid )
60 /*#ifndef NOWIREFRAME*/ //need this for old version
61 wireframetris = wiretris;
62 wireframequads = wirequads;
65 /*in the spec, GLU_DISPLAY_MODE is either
69 *In fact, GLU_FLL is has the same effect as
70 * set GL_FRONT_AND_BACK to be GL_FILL
71 * and GLU_OUTLINE_POLY is the same as set
72 * GL_FRONT_AND_BACK to be GL_LINE
73 *It is more efficient to do this once at the beginning of
74 *each surface than to do it for each primitive.
75 * The internal has more options: outline_triangle and outline_quad
76 *can be seperated. But since this is not in spec, and more importantly,
77 *this is not so useful, so we don't need to keep this option.
80 surfaceEvaluator.bgnmap2f( nuid );
83 surfaceEvaluator.polymode(N_MESHLINE);
85 surfaceEvaluator.polymode(N_MESHFILL);
89 Backend::patch( REAL ulo, REAL uhi, REAL vlo, REAL vhi )
91 surfaceEvaluator.domain2f( ulo, uhi, vlo, vhi );
95 Backend::surfbbox( long type, REAL *from, REAL *to )
97 surfaceEvaluator.range2f( type, from, to );
100 /*-------------------------------------------------------------------------
101 * surfpts - pass a desription of a surface map
102 *-------------------------------------------------------------------------
106 long type, /* geometry, color, texture, normal */
107 REAL *pts, /* control points */
108 long ustride, /* distance to next point in u direction */
109 long vstride, /* distance to next point in v direction */
110 int uorder, /* u parametric order */
111 int vorder, /* v parametric order */
112 REAL ulo, /* u lower bound */
113 REAL uhi, /* u upper bound */
114 REAL vlo, /* v lower bound */
115 REAL vhi ) /* v upper bound */
117 surfaceEvaluator.map2f( type,ulo,uhi,ustride,uorder,vlo,vhi,vstride,vorder,pts );
118 surfaceEvaluator.enable( type );
121 /*-------------------------------------------------------------------------
122 * surfgrid - define a lattice of points with origin and offset
123 *-------------------------------------------------------------------------
126 Backend::surfgrid( REAL u0, REAL u1, long nu, REAL v0, REAL v1, long nv )
128 surfaceEvaluator.mapgrid2f( nu, u0, u1, nv, v0, v1 );
131 /*-------------------------------------------------------------------------
132 * surfmesh - evaluate a mesh of points on lattice
133 *-------------------------------------------------------------------------
136 Backend::surfmesh( long u, long v, long n, long m )
139 if( wireframequads ) {
141 long u0f = u, u1f = u+n;
142 long v0f = v, v1f = v+m;
143 long parity = (u & 1);
145 for( v0 = v0f, v1 = v0f++ ; v0<v1f; v0 = v1, v1++ ) {
146 surfaceEvaluator.bgnline();
147 for( long u = u0f; u<=u1f; u++ ) {
149 surfaceEvaluator.evalpoint2i( u, v0 );
150 surfaceEvaluator.evalpoint2i( u, v1 );
152 surfaceEvaluator.evalpoint2i( u, v1 );
153 surfaceEvaluator.evalpoint2i( u, v0 );
157 surfaceEvaluator.endline();
160 surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m );
163 if( wireframequads ) {
165 surfaceEvaluator.mapmesh2f( N_MESHLINE, u, u+n, v, v+m );
168 surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m );
173 /*-------------------------------------------------------------------------
174 * endsurf - postamble to surface
175 *-------------------------------------------------------------------------
178 Backend::endsurf( void )
180 surfaceEvaluator.endmap2f();
183 /***************************************/
185 Backend::bgntfan( void )
187 surfaceEvaluator.bgntfan();
190 surfaceEvaluator.polymode( N_MESHLINE );
192 surfaceEvaluator.polymode( N_MESHFILL );
197 Backend::endtfan( void )
199 surfaceEvaluator.endtfan();
203 Backend::bgnqstrip( void )
205 surfaceEvaluator.bgnqstrip();
208 surfaceEvaluator.polymode( N_MESHLINE );
210 surfaceEvaluator.polymode( N_MESHFILL );
215 Backend::endqstrip( void )
217 surfaceEvaluator.endqstrip();
221 Backend::evalUStrip(int n_upper, REAL v_upper, REAL* upper_val,
222 int n_lower, REAL v_lower, REAL* lower_val
225 surfaceEvaluator.evalUStrip(n_upper, v_upper, upper_val,
226 n_lower, v_lower, lower_val);
230 Backend::evalVStrip(int n_left, REAL u_left, REAL* left_val,
231 int n_right, REAL u_right, REAL* right_val
234 surfaceEvaluator.evalVStrip(n_left, u_left, left_val,
235 n_right, u_right, right_val);
238 /***************************************/
241 /*-------------------------------------------------------------------------
242 * bgntmesh - preamble to a triangle mesh
243 *-------------------------------------------------------------------------
246 Backend::bgntmesh( const char * )
250 meshindex = 0; /* I think these need to be initialized to zero */
253 if( !wireframetris ) {
254 surfaceEvaluator.bgntmesh();
258 if( wireframetris ) {
259 surfaceEvaluator.bgntmesh();
260 surfaceEvaluator.polymode( N_MESHLINE );
262 surfaceEvaluator.bgntmesh();
263 surfaceEvaluator.polymode( N_MESHFILL );
269 Backend::tmeshvert( GridTrimVertex *v )
271 if( v->isGridVert() ) {
279 Backend::tmeshvertNOGE(TrimVertex *t)
281 // surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], temp, ttt);
283 surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], t->cache_point, t->cache_normal);
287 //opt for a line with the same u.
289 Backend::tmeshvertNOGE_BU(TrimVertex *t)
292 surfaceEvaluator.inDoEvalCoord2NOGE_BU( t->param[0], t->param[1], t->cache_point, t->cache_normal);
296 //opt for a line with the same v.
298 Backend::tmeshvertNOGE_BV(TrimVertex *t)
301 surfaceEvaluator.inDoEvalCoord2NOGE_BV( t->param[0], t->param[1], t->cache_point, t->cache_normal);
306 Backend::preEvaluateBU(REAL u)
308 surfaceEvaluator.inPreEvaluateBU_intfac(u);
312 Backend::preEvaluateBV(REAL v)
314 surfaceEvaluator.inPreEvaluateBV_intfac(v);
318 /*-------------------------------------------------------------------------
319 * tmeshvert - evaluate a point on a triangle mesh
320 *-------------------------------------------------------------------------
323 Backend::tmeshvert( TrimVertex *t )
327 const long nuid = t->nuid;
329 const REAL u = t->param[0];
330 const REAL v = t->param[1];
334 if( wireframetris ) {
336 surfaceEvaluator.bgnclosedline();
337 if( mesh[0][2] == 0 )
338 surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] );
340 surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
341 if( mesh[1][2] == 0 )
342 surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] );
344 surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
345 surfaceEvaluator.evalcoord2f( nuid, u, v );
346 surfaceEvaluator.endclosedline();
348 mesh[meshindex][0] = u;
349 mesh[meshindex][1] = v;
350 mesh[meshindex][2] = 0;
351 mesh[meshindex][3] = nuid;
352 meshindex = (meshindex+1) % 2;
354 surfaceEvaluator.evalcoord2f( nuid, u, v );
358 surfaceEvaluator.evalcoord2f( 0, u, v );
359 //for uninitial memory read surfaceEvaluator.evalcoord2f( nuid, u, v );
363 //the same as tmeshvert(trimvertex), for efficiency purpose
365 Backend::tmeshvert( REAL u, REAL v )
371 if( wireframetris ) {
373 surfaceEvaluator.bgnclosedline();
374 if( mesh[0][2] == 0 )
375 surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] );
377 surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
378 if( mesh[1][2] == 0 )
379 surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] );
381 surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
382 surfaceEvaluator.evalcoord2f( nuid, u, v );
383 surfaceEvaluator.endclosedline();
385 mesh[meshindex][0] = u;
386 mesh[meshindex][1] = v;
387 mesh[meshindex][2] = 0;
388 mesh[meshindex][3] = nuid;
389 meshindex = (meshindex+1) % 2;
391 surfaceEvaluator.evalcoord2f( nuid, u, v );
395 surfaceEvaluator.evalcoord2f( 0, u, v );
399 /*-------------------------------------------------------------------------
400 * tmeshvert - evaluate a grid point of a triangle mesh
401 *-------------------------------------------------------------------------
404 Backend::tmeshvert( GridVertex *g )
406 const long u = g->gparam[0];
407 const long v = g->gparam[1];
411 if( wireframetris ) {
413 surfaceEvaluator.bgnclosedline();
414 if( mesh[0][2] == 0 )
415 surfaceEvaluator.evalcoord2f( (long) mesh[0][3], mesh[0][0], mesh[0][1] );
417 surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] );
418 if( mesh[1][2] == 0 )
419 surfaceEvaluator.evalcoord2f( (long) mesh[1][3], mesh[1][0], mesh[1][1] );
421 surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] );
422 surfaceEvaluator.evalpoint2i( u, v );
423 surfaceEvaluator.endclosedline();
425 mesh[meshindex][0] = u;
426 mesh[meshindex][1] = v;
427 mesh[meshindex][2] = 1;
428 meshindex = (meshindex+1) % 2;
430 surfaceEvaluator.evalpoint2i( u, v );
433 surfaceEvaluator.evalpoint2i( u, v );
437 /*-------------------------------------------------------------------------
438 * swaptmesh - perform a swap of the triangle mesh pointers
439 *-------------------------------------------------------------------------
442 Backend::swaptmesh( void )
445 if( wireframetris ) {
446 meshindex = 1 - meshindex;
448 surfaceEvaluator.swaptmesh();
451 surfaceEvaluator.swaptmesh();
455 /*-------------------------------------------------------------------------
456 * endtmesh - postamble to triangle mesh
457 *-------------------------------------------------------------------------
460 Backend::endtmesh( void )
463 if( ! wireframetris )
464 surfaceEvaluator.endtmesh();
466 surfaceEvaluator.endtmesh();
467 /* surfaceEvaluator.polymode( N_MESHFILL );*/
472 /*-------------------------------------------------------------------------
473 * bgnoutline - preamble to outlined rendering
474 *-------------------------------------------------------------------------
477 Backend::bgnoutline( void )
479 surfaceEvaluator.bgnline();
482 /*-------------------------------------------------------------------------
483 * linevert - evaluate a point on an outlined contour
484 *-------------------------------------------------------------------------
487 Backend::linevert( TrimVertex *t )
489 surfaceEvaluator.evalcoord2f( t->nuid, t->param[0], t->param[1] );
492 /*-------------------------------------------------------------------------
493 * linevert - evaluate a grid point of an outlined contour
494 *-------------------------------------------------------------------------
497 Backend::linevert( GridVertex *g )
499 surfaceEvaluator.evalpoint2i( g->gparam[0], g->gparam[1] );
502 /*-------------------------------------------------------------------------
503 * endoutline - postamble to outlined rendering
504 *-------------------------------------------------------------------------
507 Backend::endoutline( void )
509 surfaceEvaluator.endline();
512 /*-------------------------------------------------------------------------
513 * triangle - output a triangle
514 *-------------------------------------------------------------------------
517 Backend::triangle( TrimVertex *a, TrimVertex *b, TrimVertex *c )
519 /* bgntmesh( "spittriangle" );*/
529 Backend::bgncurv( void )
531 curveEvaluator.bgnmap1f( 0 );
535 Backend::segment( REAL ulo, REAL uhi )
537 curveEvaluator.domain1f( ulo, uhi );
542 long type, /* geometry, color, texture, normal */
543 REAL *pts, /* control points */
544 long stride, /* distance to next point */
545 int order, /* parametric order */
546 REAL ulo, /* lower parametric bound */
547 REAL uhi ) /* upper parametric bound */
550 curveEvaluator.map1f( type, ulo, uhi, stride, order, pts );
551 curveEvaluator.enable( type );
555 Backend::curvgrid( REAL u0, REAL u1, long nu )
557 curveEvaluator.mapgrid1f( nu, u0, u1 );
561 Backend::curvmesh( long from, long n )
563 curveEvaluator.mapmesh1f( N_MESHFILL, from, from+n );
567 Backend::curvpt(REAL u)
569 curveEvaluator.evalcoord1f( 0, u );
573 Backend::bgnline( void )
575 curveEvaluator.bgnline();
579 Backend::endline( void )
581 curveEvaluator.endline();
585 Backend::endcurv( void )
587 curveEvaluator.endmap1f();