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Diffstat (limited to 'src/glu/sgi/libnurbs/internals/backend.cc')
| -rw-r--r-- | src/glu/sgi/libnurbs/internals/backend.cc | 591 |
1 files changed, 591 insertions, 0 deletions
diff --git a/src/glu/sgi/libnurbs/internals/backend.cc b/src/glu/sgi/libnurbs/internals/backend.cc new file mode 100644 index 00000000000..6367bf45f94 --- /dev/null +++ b/src/glu/sgi/libnurbs/internals/backend.cc @@ -0,0 +1,591 @@ +/* +** 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. +*/ + +/* + * backend.c++ + * + * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $ + * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/backend.cc,v 1.1 2001/03/17 00:25:40 brianp Exp $ + */ + +/* Bezier surface backend + - interprets display mode (wireframe,shaded,...) +*/ +#include <stdio.h> +#include "glimports.h" +#include "mystdio.h" +#include "backend.h" +#include "basiccrveval.h" +#include "basicsurfeval.h" +#include "nurbsconsts.h" + +#define NOWIREFRAME + + +/*------------------------------------------------------------------------- + * bgnsurf - preamble to surface definition and evaluations + *------------------------------------------------------------------------- + */ +void +Backend::bgnsurf( int wiretris, int wirequads, long nuid ) +{ +/*#ifndef NOWIREFRAME*/ //need this for old version + wireframetris = wiretris; + wireframequads = wirequads; +/*#endif*/ + + /*in the spec, GLU_DISPLAY_MODE is either + * GLU_FILL + * GLU_OUTLINE_POLY + * GLU_OUTLINE_PATCH. + *In fact, GLU_FLL is has the same effect as + * set GL_FRONT_AND_BACK to be GL_FILL + * and GLU_OUTLINE_POLY is the same as set + * GL_FRONT_AND_BACK to be GL_LINE + *It is more efficient to do this once at the beginning of + *each surface than to do it for each primitive. + * The internal has more options: outline_triangle and outline_quad + *can be seperated. But since this is not in spec, and more importantly, + *this is not so useful, so we don't need to keep this option. + */ + + surfaceEvaluator.bgnmap2f( nuid ); + + if(wiretris) + surfaceEvaluator.polymode(N_MESHLINE); + else + surfaceEvaluator.polymode(N_MESHFILL); +} + +void +Backend::patch( REAL ulo, REAL uhi, REAL vlo, REAL vhi ) +{ + surfaceEvaluator.domain2f( ulo, uhi, vlo, vhi ); +} + +void +Backend::surfbbox( long type, REAL *from, REAL *to ) +{ + surfaceEvaluator.range2f( type, from, to ); +} + +/*------------------------------------------------------------------------- + * surfpts - pass a desription of a surface map + *------------------------------------------------------------------------- + */ +void +Backend::surfpts( + long type, /* geometry, color, texture, normal */ + REAL *pts, /* control points */ + long ustride, /* distance to next point in u direction */ + long vstride, /* distance to next point in v direction */ + int uorder, /* u parametric order */ + int vorder, /* v parametric order */ + REAL ulo, /* u lower bound */ + REAL uhi, /* u upper bound */ + REAL vlo, /* v lower bound */ + REAL vhi ) /* v upper bound */ +{ + surfaceEvaluator.map2f( type,ulo,uhi,ustride,uorder,vlo,vhi,vstride,vorder,pts ); + surfaceEvaluator.enable( type ); +} + +/*------------------------------------------------------------------------- + * surfgrid - define a lattice of points with origin and offset + *------------------------------------------------------------------------- + */ +void +Backend::surfgrid( REAL u0, REAL u1, long nu, REAL v0, REAL v1, long nv ) +{ + surfaceEvaluator.mapgrid2f( nu, u0, u1, nv, v0, v1 ); +} + +/*------------------------------------------------------------------------- + * surfmesh - evaluate a mesh of points on lattice + *------------------------------------------------------------------------- + */ +void +Backend::surfmesh( long u, long v, long n, long m ) +{ +#ifndef NOWIREFRAME + if( wireframequads ) { + long v0, v1; + long u0f = u, u1f = u+n; + long v0f = v, v1f = v+m; + long parity = (u & 1); + + for( v0 = v0f, v1 = v0f++ ; v0<v1f; v0 = v1, v1++ ) { + surfaceEvaluator.bgnline(); + for( long u = u0f; u<=u1f; u++ ) { + if( parity ) { + surfaceEvaluator.evalpoint2i( u, v0 ); + surfaceEvaluator.evalpoint2i( u, v1 ); + } else { + surfaceEvaluator.evalpoint2i( u, v1 ); + surfaceEvaluator.evalpoint2i( u, v0 ); + } + parity = 1 - parity; + } + surfaceEvaluator.endline(); + } + } else { + surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m ); + } +#else + if( wireframequads ) { + + surfaceEvaluator.mapmesh2f( N_MESHLINE, u, u+n, v, v+m ); + } else { + + surfaceEvaluator.mapmesh2f( N_MESHFILL, u, u+n, v, v+m ); + } +#endif +} + +/*------------------------------------------------------------------------- + * endsurf - postamble to surface + *------------------------------------------------------------------------- + */ +void +Backend::endsurf( void ) +{ + surfaceEvaluator.endmap2f(); +} + +/***************************************/ +void +Backend::bgntfan( void ) +{ + surfaceEvaluator.bgntfan(); +/* + if(wireframetris) + surfaceEvaluator.polymode( N_MESHLINE ); + else + surfaceEvaluator.polymode( N_MESHFILL ); +*/ +} + +void +Backend::endtfan( void ) +{ + surfaceEvaluator.endtfan(); +} + +void +Backend::bgnqstrip( void ) +{ + surfaceEvaluator.bgnqstrip(); +/* + if(wireframequads) + surfaceEvaluator.polymode( N_MESHLINE ); + else + surfaceEvaluator.polymode( N_MESHFILL ); +*/ +} + +void +Backend::endqstrip( void ) +{ + surfaceEvaluator.endqstrip(); +} + +void +Backend::evalUStrip(int n_upper, REAL v_upper, REAL* upper_val, + int n_lower, REAL v_lower, REAL* lower_val + ) +{ + surfaceEvaluator.evalUStrip(n_upper, v_upper, upper_val, + n_lower, v_lower, lower_val); +} + +void +Backend::evalVStrip(int n_left, REAL u_left, REAL* left_val, + int n_right, REAL u_right, REAL* right_val + ) +{ + surfaceEvaluator.evalVStrip(n_left, u_left, left_val, + n_right, u_right, right_val); +} + +/***************************************/ + + +/*------------------------------------------------------------------------- + * bgntmesh - preamble to a triangle mesh + *------------------------------------------------------------------------- + */ +void +Backend::bgntmesh( char * ) +{ +#ifndef NOWIREFRAME + + meshindex = 0; /* I think these need to be initialized to zero */ + npts = 0; + + if( !wireframetris ) { + surfaceEvaluator.bgntmesh(); + } +#else + + if( wireframetris ) { + surfaceEvaluator.bgntmesh(); + surfaceEvaluator.polymode( N_MESHLINE ); + } else { + surfaceEvaluator.bgntmesh(); + surfaceEvaluator.polymode( N_MESHFILL ); + } +#endif +} + +void +Backend::tmeshvert( GridTrimVertex *v ) +{ + if( v->isGridVert() ) { + tmeshvert( v->g ); + } else { + tmeshvert( v->t ); + } +} + +void +Backend::tmeshvertNOGE(TrimVertex *t) +{ +// surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], temp, ttt); +#ifdef USE_OPTTT + surfaceEvaluator.inDoEvalCoord2NOGE( t->param[0], t->param[1], t->cache_point, t->cache_normal); +#endif +} + +//opt for a line with the same u. +void +Backend::tmeshvertNOGE_BU(TrimVertex *t) +{ +#ifdef USE_OPTTT + surfaceEvaluator.inDoEvalCoord2NOGE_BU( t->param[0], t->param[1], t->cache_point, t->cache_normal); +#endif +} + +//opt for a line with the same v. +void +Backend::tmeshvertNOGE_BV(TrimVertex *t) +{ +#ifdef USE_OPTTT + surfaceEvaluator.inDoEvalCoord2NOGE_BV( t->param[0], t->param[1], t->cache_point, t->cache_normal); +#endif +} + +void +Backend::preEvaluateBU(REAL u) +{ + surfaceEvaluator.inPreEvaluateBU_intfac(u); +} + +void +Backend::preEvaluateBV(REAL v) +{ + surfaceEvaluator.inPreEvaluateBV_intfac(v); +} + + +/*------------------------------------------------------------------------- + * tmeshvert - evaluate a point on a triangle mesh + *------------------------------------------------------------------------- + */ +void +Backend::tmeshvert( TrimVertex *t ) +{ + + const long nuid = t->nuid; + const REAL u = t->param[0]; + const REAL v = t->param[1]; + +#ifndef NOWIREFRAME + npts++; + if( wireframetris ) { + if( npts >= 3 ) { + surfaceEvaluator.bgnclosedline(); + if( mesh[0][2] == 0 ) + surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] ); + if( mesh[1][2] == 0 ) + surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] ); + surfaceEvaluator.evalcoord2f( nuid, u, v ); + surfaceEvaluator.endclosedline(); + } + mesh[meshindex][0] = u; + mesh[meshindex][1] = v; + mesh[meshindex][2] = 0; + mesh[meshindex][3] = nuid; + meshindex = (meshindex+1) % 2; + } else { + surfaceEvaluator.evalcoord2f( nuid, u, v ); + } +#else + + surfaceEvaluator.evalcoord2f( 0, u, v ); +//for uninitial memory read surfaceEvaluator.evalcoord2f( nuid, u, v ); +#endif +} + +//the same as tmeshvert(trimvertex), for efficiency purpose +void +Backend::tmeshvert( REAL u, REAL v ) +{ + + const long nuid = 0; + + +#ifndef NOWIREFRAME + npts++; + if( wireframetris ) { + if( npts >= 3 ) { + surfaceEvaluator.bgnclosedline(); + if( mesh[0][2] == 0 ) + surfaceEvaluator.evalcoord2f( mesh[0][3], mesh[0][0], mesh[0][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] ); + if( mesh[1][2] == 0 ) + surfaceEvaluator.evalcoord2f( mesh[1][3], mesh[1][0], mesh[1][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] ); + surfaceEvaluator.evalcoord2f( nuid, u, v ); + surfaceEvaluator.endclosedline(); + } + mesh[meshindex][0] = u; + mesh[meshindex][1] = v; + mesh[meshindex][2] = 0; + mesh[meshindex][3] = nuid; + meshindex = (meshindex+1) % 2; + } else { + surfaceEvaluator.evalcoord2f( nuid, u, v ); + } +#else + + surfaceEvaluator.evalcoord2f( 0, u, v ); +#endif +} + +/*------------------------------------------------------------------------- + * tmeshvert - evaluate a grid point of a triangle mesh + *------------------------------------------------------------------------- + */ +void +Backend::tmeshvert( GridVertex *g ) +{ + const long u = g->gparam[0]; + const long v = g->gparam[1]; + +#ifndef NOWIREFRAME + npts++; + if( wireframetris ) { + if( npts >= 3 ) { + surfaceEvaluator.bgnclosedline(); + if( mesh[0][2] == 0 ) + surfaceEvaluator.evalcoord2f( (long) mesh[0][3], mesh[0][0], mesh[0][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[0][0], (long) mesh[0][1] ); + if( mesh[1][2] == 0 ) + surfaceEvaluator.evalcoord2f( (long) mesh[1][3], mesh[1][0], mesh[1][1] ); + else + surfaceEvaluator.evalpoint2i( (long) mesh[1][0], (long) mesh[1][1] ); + surfaceEvaluator.evalpoint2i( u, v ); + surfaceEvaluator.endclosedline(); + } + mesh[meshindex][0] = u; + mesh[meshindex][1] = v; + mesh[meshindex][2] = 1; + meshindex = (meshindex+1) % 2; + } else { + surfaceEvaluator.evalpoint2i( u, v ); + } +#else + surfaceEvaluator.evalpoint2i( u, v ); +#endif +} + +/*------------------------------------------------------------------------- + * swaptmesh - perform a swap of the triangle mesh pointers + *------------------------------------------------------------------------- + */ +void +Backend::swaptmesh( void ) +{ +#ifndef NOWIREFRAME + if( wireframetris ) { + meshindex = 1 - meshindex; + } else { + surfaceEvaluator.swaptmesh(); + } +#else + surfaceEvaluator.swaptmesh(); +#endif +} + +/*------------------------------------------------------------------------- + * endtmesh - postamble to triangle mesh + *------------------------------------------------------------------------- + */ +void +Backend::endtmesh( void ) +{ +#ifndef NOWIREFRAME + if( ! wireframetris ) + surfaceEvaluator.endtmesh(); +#else + surfaceEvaluator.endtmesh(); +/* surfaceEvaluator.polymode( N_MESHFILL );*/ +#endif +} + + +/*------------------------------------------------------------------------- + * bgnoutline - preamble to outlined rendering + *------------------------------------------------------------------------- + */ +void +Backend::bgnoutline( void ) +{ + surfaceEvaluator.bgnline(); +} + +/*------------------------------------------------------------------------- + * linevert - evaluate a point on an outlined contour + *------------------------------------------------------------------------- + */ +void +Backend::linevert( TrimVertex *t ) +{ + surfaceEvaluator.evalcoord2f( t->nuid, t->param[0], t->param[1] ); +} + +/*------------------------------------------------------------------------- + * linevert - evaluate a grid point of an outlined contour + *------------------------------------------------------------------------- + */ +void +Backend::linevert( GridVertex *g ) +{ + surfaceEvaluator.evalpoint2i( g->gparam[0], g->gparam[1] ); +} + +/*------------------------------------------------------------------------- + * endoutline - postamble to outlined rendering + *------------------------------------------------------------------------- + */ +void +Backend::endoutline( void ) +{ + surfaceEvaluator.endline(); +} + +/*------------------------------------------------------------------------- + * triangle - output a triangle + *------------------------------------------------------------------------- + */ +void +Backend::triangle( TrimVertex *a, TrimVertex *b, TrimVertex *c ) +{ +/* bgntmesh( "spittriangle" );*/ + bgntfan(); + tmeshvert( a ); + tmeshvert( b ); + tmeshvert( c ); + endtfan(); +/* endtmesh();*/ +} + +void +Backend::bgncurv( void ) +{ + curveEvaluator.bgnmap1f( 0 ); +} + +void +Backend::segment( REAL ulo, REAL uhi ) +{ + curveEvaluator.domain1f( ulo, uhi ); +} + +void +Backend::curvpts( + long type, /* geometry, color, texture, normal */ + REAL *pts, /* control points */ + long stride, /* distance to next point */ + int order, /* parametric order */ + REAL ulo, /* lower parametric bound */ + REAL uhi ) /* upper parametric bound */ + +{ + curveEvaluator.map1f( type, ulo, uhi, stride, order, pts ); + curveEvaluator.enable( type ); +} + +void +Backend::curvgrid( REAL u0, REAL u1, long nu ) +{ + curveEvaluator.mapgrid1f( nu, u0, u1 ); +} + +void +Backend::curvmesh( long from, long n ) +{ + curveEvaluator.mapmesh1f( N_MESHFILL, from, from+n ); +} + +void +Backend::curvpt(REAL u) +{ + curveEvaluator.evalcoord1f( 0, u ); +} + +void +Backend::bgnline( void ) +{ + curveEvaluator.bgnline(); +} + +void +Backend::endline( void ) +{ + curveEvaluator.endline(); +} + +void +Backend::endcurv( void ) +{ + curveEvaluator.endmap1f(); +} |