backend.cc

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

}

//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 )
{

#ifndef NOWIREFRAME
    const long nuid = t->nuid;
#endif
    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 )
{
#ifndef NOWIREFRAME
    const long nuid = 0;
    
    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();
}