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--- a/mesalib/src/glu/sgi/libnurbs/internals/coveandtiler.cc
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-/*
-** 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.
-*/
-
-/*
- * coveandtiler.c++
- *
- */
-
-#include "glimports.h"
-#include "myassert.h"
-#include "mystdio.h"
-#include "coveandtiler.h"
-#include "gridvertex.h"
-#include "gridtrimvertex.h"
-#include "uarray.h"
-#include "backend.h"
-
-
-const int CoveAndTiler::MAXSTRIPSIZE = 1000;
-
-CoveAndTiler::CoveAndTiler( Backend& b )
- : backend( b )
-{ }
-
-CoveAndTiler::~CoveAndTiler( void )
-{ }
-
-inline void
-CoveAndTiler::output( GridVertex &gv )
-{
- backend.tmeshvert( &gv );
-}
-
-inline void
-CoveAndTiler::output( TrimVertex *tv )
-{
- backend.tmeshvert( tv );
-}
-
-inline void
-CoveAndTiler::output( GridTrimVertex& g )
-{
- backend.tmeshvert( &g );
-}
-
-void
-CoveAndTiler::coveAndTile( void )
-{
- long ustart = (top.ustart >= bot.ustart) ? top.ustart : bot.ustart;
- long uend = (top.uend <= bot.uend) ? top.uend : bot.uend;
- if( ustart <= uend ) {
- tile( bot.vindex, ustart, uend );
- if( top.ustart >= bot.ustart )
- coveUpperLeft();
- else
- coveLowerLeft();
-
- if( top.uend <= bot.uend )
- coveUpperRight();
- else
- coveLowerRight();
- } else {
- TrimVertex blv, tlv, *bl, *tl;
- GridTrimVertex bllv, tllv;
- TrimVertex *lf = left.first();
- TrimVertex *ll = left.last();
- if( lf->param[0] >= ll->param[0] ) {
- blv.param[0] = lf->param[0];
- blv.param[1] = ll->param[1];
- blv.nuid = 0; // XXX
- assert( blv.param[1] == bot.vval );
- bl = &blv;
- tl = lf;
- tllv.set( lf );
- if( ll->param[0] > uarray.uarray[top.ustart-1] ) {
- bllv.set( ll );
- assert( ll->param[0] <= uarray.uarray[bot.ustart] );
- } else {
- bllv.set( top.ustart-1, bot.vindex );
- }
- coveUpperLeftNoGrid( bl );
- } else {
- tlv.param[0] = ll->param[0];
- tlv.param[1] = lf->param[1];
- tlv.nuid = 0; // XXX
- assert( tlv.param[1] == top.vval );
- tl = &tlv;
- bl = ll;
- bllv.set( ll );
- if( lf->param[0] > uarray.uarray[bot.ustart-1] ) {
- assert( lf->param[0] <= uarray.uarray[bot.ustart] );
- tllv.set( lf );
- } else {
- tllv.set( bot.ustart-1, top.vindex );
- }
- coveLowerLeftNoGrid( tl );
- }
-
- TrimVertex brv, trv, *br, *tr;
- GridTrimVertex brrv, trrv;
- TrimVertex *rf = right.first();
- TrimVertex *rl = right.last();
-
- if( rf->param[0] <= rl->param[0] ) {
- brv.param[0] = rf->param[0];
- brv.param[1] = rl->param[1];
- brv.nuid = 0; // XXX
- assert( brv.param[1] == bot.vval );
- br = &brv;
- tr = rf;
- trrv.set( rf );
- if( rl->param[0] < uarray.uarray[top.uend+1] ) {
- assert( rl->param[0] >= uarray.uarray[top.uend] );
- brrv.set( rl );
- } else {
- brrv.set( top.uend+1, bot.vindex );
- }
- coveUpperRightNoGrid( br );
- } else {
- trv.param[0] = rl->param[0];
- trv.param[1] = rf->param[1];
- trv.nuid = 0; // XXX
- assert( trv.param[1] == top.vval );
- tr = &trv;
- br = rl;
- brrv.set( rl );
- if( rf->param[0] < uarray.uarray[bot.uend+1] ) {
- assert( rf->param[0] >= uarray.uarray[bot.uend] );
- trrv.set( rf );
- } else {
- trrv.set( bot.uend+1, top.vindex );
- }
- coveLowerRightNoGrid( tr );
- }
-
- backend.bgntmesh( "doit" );
- output(trrv);
- output(tllv);
- output( tr );
- output( tl );
- output( br );
- output( bl );
- output(brrv);
- output(bllv);
- backend.endtmesh();
- }
-}
-
-void
-CoveAndTiler::tile( long vindex, long ustart, long uend )
-{
- long numsteps = uend - ustart;
-
- if( numsteps == 0 ) return;
-
- if( numsteps > MAXSTRIPSIZE ) {
- long umid = ustart + (uend - ustart) / 2;
- tile( vindex, ustart, umid );
- tile( vindex, umid, uend );
- } else {
- backend.surfmesh( ustart, vindex-1, numsteps, 1 );
- }
-}
-
-void
-CoveAndTiler::coveUpperRight( void )
-{
- GridVertex tgv( top.uend, top.vindex );
- GridVertex gv( top.uend, bot.vindex );
-
- right.first();
- backend.bgntmesh( "coveUpperRight" );
- output( right.next() );
- output( tgv );
- backend.swaptmesh();
- output( gv );
- coveUR();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveUpperRightNoGrid( TrimVertex* br )
-{
- backend.bgntmesh( "coveUpperRight" );
- output( right.first() );
- output( right.next() );
- backend.swaptmesh();
- output( br );
- coveUR();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveUR( )
-{
- GridVertex gv( top.uend, bot.vindex );
- TrimVertex *vert = right.next();
- if( vert == NULL ) return;
-
- assert( vert->param[0] >= uarray.uarray[gv.gparam[0]] );
-
- if( gv.nextu() >= bot.uend ) {
- for( ; vert; vert = right.next() ) {
- output( vert );
- backend.swaptmesh();
- }
- } else while( 1 ) {
- if( vert->param[0] < uarray.uarray[gv.gparam[0]] ) {
- output( vert );
- backend.swaptmesh();
- vert = right.next();
- if( vert == NULL ) break;
- } else {
- backend.swaptmesh();
- output( gv );
- if( gv.nextu() == bot.uend ) {
- for( ; vert; vert = right.next() ) {
- output( vert );
- backend.swaptmesh();
- }
- break;
- }
- }
- }
-}
-
-void
-CoveAndTiler::coveUpperLeft( void )
-{
- GridVertex tgv( top.ustart, top.vindex );
- GridVertex gv( top.ustart, bot.vindex );
-
- left.first();
- backend.bgntmesh( "coveUpperLeft" );
- output( tgv );
- output( left.next() );
- output( gv );
- backend.swaptmesh();
- coveUL();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveUpperLeftNoGrid( TrimVertex* bl )
-{
- backend.bgntmesh( "coveUpperLeftNoGrid" );
- output( left.first() );
- output( left.next() );
- output( bl );
- backend.swaptmesh();
- coveUL();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveUL()
-{
- GridVertex gv( top.ustart, bot.vindex );
- TrimVertex *vert = left.next();
- if( vert == NULL ) return;
- assert( vert->param[0] <= uarray.uarray[gv.gparam[0]] );
-
- if( gv.prevu() <= bot.ustart ) {
- for( ; vert; vert = left.next() ) {
- backend.swaptmesh();
- output( vert );
- }
- } else while( 1 ) {
- if( vert->param[0] > uarray.uarray[gv.gparam[0]] ) {
- backend.swaptmesh();
- output( vert );
- vert = left.next();
- if( vert == NULL ) break;
- } else {
- output( gv );
- backend.swaptmesh();
- if( gv.prevu() == bot.ustart ) {
- for( ; vert; vert = left.next() ) {
- backend.swaptmesh();
- output( vert );
- }
- break;
- }
- }
- }
-}
-
-void
-CoveAndTiler::coveLowerLeft( void )
-{
- GridVertex bgv( bot.ustart, bot.vindex );
- GridVertex gv( bot.ustart, top.vindex );
-
- left.last();
- backend.bgntmesh( "coveLowerLeft" );
- output( left.prev() );
- output( bgv );
- backend.swaptmesh();
- output( gv );
- coveLL();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveLowerLeftNoGrid( TrimVertex* tl )
-{
- backend.bgntmesh( "coveLowerLeft" );
- output( left.last() );
- output( left.prev() );
- backend.swaptmesh();
- output( tl );
- coveLL( );
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveLL()
-{
- GridVertex gv( bot.ustart, top.vindex );
- TrimVertex *vert = left.prev();
- if( vert == NULL ) return;
- assert( vert->param[0] <= uarray.uarray[gv.gparam[0]] );
-
- if( gv.prevu() <= top.ustart ) {
- for( ; vert; vert = left.prev() ) {
- output( vert );
- backend.swaptmesh();
- }
- } else while( 1 ) {
- if( vert->param[0] > uarray.uarray[gv.gparam[0]] ){
- output( vert );
- backend.swaptmesh();
- vert = left.prev();
- if( vert == NULL ) break;
- } else {
- backend.swaptmesh();
- output( gv );
- if( gv.prevu() == top.ustart ) {
- for( ; vert; vert = left.prev() ) {
- output( vert );
- backend.swaptmesh();
- }
- break;
- }
- }
- }
-}
-
-void
-CoveAndTiler::coveLowerRight( void )
-{
- GridVertex bgv( bot.uend, bot.vindex );
- GridVertex gv( bot.uend, top.vindex );
-
- right.last();
- backend.bgntmesh( "coveLowerRight" );
- output( bgv );
- output( right.prev() );
- output( gv );
- backend.swaptmesh();
- coveLR();
- backend.endtmesh( );
-}
-
-void
-CoveAndTiler::coveLowerRightNoGrid( TrimVertex* tr )
-{
- backend.bgntmesh( "coveLowerRIght" );
- output( right.last() );
- output( right.prev() );
- output( tr );
- backend.swaptmesh();
- coveLR();
- backend.endtmesh();
-}
-
-void
-CoveAndTiler::coveLR( )
-{
- GridVertex gv( bot.uend, top.vindex );
- TrimVertex *vert = right.prev();
- if( vert == NULL ) return;
- assert( vert->param[0] >= uarray.uarray[gv.gparam[0]] );
-
- if( gv.nextu() >= top.uend ) {
- for( ; vert; vert = right.prev() ) {
- backend.swaptmesh();
- output( vert );
- }
- } else while( 1 ) {
- if( vert->param[0] < uarray.uarray[gv.gparam[0]] ) {
- backend.swaptmesh();
- output( vert );
- vert = right.prev();
- if( vert == NULL ) break;
- } else {
- output( gv );
- backend.swaptmesh();
- if( gv.nextu() == top.uend ) {
- for( ; vert; vert = right.prev() ) {
- backend.swaptmesh();
- output( vert );
- }
- break;
- }
- }
- }
-}
-
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