int
main(int argc, char** argv)
{
bool verb, fsrf, snap, expl, dabc, cden, adj;
bool optfd, hybrid, sinc;
int jsnap, jdata;
/* I/O files */
sf_file file_wav=NULL; /* wavelet */
sf_file file_vel=NULL; /* velocity */
sf_file file_den=NULL; /* density */
sf_file file_wfl=NULL; /* wavefield */
sf_file file_dat=NULL; /* data */
sf_file file_src=NULL; /* sources */
sf_file file_rec=NULL; /* receivers */
/* cube axes */
sf_axis at = NULL, az = NULL, ax = NULL, ay = NULL;
sf_axis as = NULL, ar = NULL;
int nbd; /* ABC boundary size */
int fdorder; /* finite difference spatial accuracy order */
int nzpad,nxpad,nypad; /* boundary padded model size */
int ix,iy,it,is,nx,ny,nz,nt,ns,nr;
float dx,dy,dz,dt,dt2;
float* damp=NULL; /* damping profile for hybrid bc */
float* ws; /* wavelet */
float*** vel=NULL; /* velocity */
float*** rho=NULL; /* density */
float*** u0=NULL; /* wavefield array u@t-1 (u@t+1) */
float*** u1=NULL; /* wavefield array u@t */
float* u_dat=NULL; /* output data */
float*** ptr_tmp=NULL;
pt3d* src3d=NULL; /* source position */
pt3d* rec3d=NULL; /*receiver position*/
scoef3d cssinc = NULL, crsinc = NULL;
lint3d cslint = NULL, crlint = NULL;
/* FDM structure */
fdm3d fdm = NULL;
abcone3d abc = NULL;
sponge spo = NULL;
int nbell;
float* fdcoef_d2;
float* fdcoef_d1;
sf_axis acz = NULL, acx = NULL, acy = NULL;
int nqz, nqx, nqy;
float oqz, oqx, oqy, dqz, dqx, dqy;
float** oslice = NULL; /* output 3D wavefield slice-by-slice */
float*** tmp_array;
double wall_clock_time_s, wall_clock_time_e;
const int SECOND_DERIV = 2;
const int FIRST_DERIV = 1;
int nop;
#if defined _OPENMP && _DEBUG
double tic;
double toc;
#endif
/* init RSF */
sf_init(argc,argv);
#ifdef _OPENMP
omp_init();
wall_clock_time_s = omp_get_wtime();
#else
wall_clock_time_s = (double) clock() / CLOCKS_PER_SEC;
#endif
if (!sf_getbool("verb",&verb)) verb=false; /* Verbosity flag */
if (!sf_getbool("snap",&snap)) snap=false; /* Wavefield snapshots flag */
if (!sf_getbool("expl",&expl)) expl=false; /* Multiple sources, one wvlt*/
if (!sf_getbool("dabc",&dabc)) dabc=false; /* Absorbing BC */
if (!sf_getbool("cden",&cden)) cden=false; /* Constant density */
if (!sf_getbool("adj",&adj)) adj=false; /* adjoint flag */
if (!sf_getbool("free",&fsrf) && !sf_getbool("fsrf",&fsrf)) fsrf=false; /* Free surface flag */
if (!sf_getint("nbell",&nbell)) nbell=5; /* gaussian for source injection */
if (!sf_getbool("optfd",&optfd)) optfd=false; /* optimized FD coefficients flag */
if (!sf_getint("fdorder",&fdorder)) fdorder=4; /* spatial FD order */
if (!sf_getbool("hybridbc",&hybrid)) hybrid=false; /* hybrid Absorbing BC */
if (!sf_getbool("sinc",&sinc)) sinc=false; /* sinc source injection */
/* Initialize variables */
file_wav = sf_input("in"); /* wavelet */
file_vel = sf_input("vel"); /* velocity */
file_src = sf_input("sou"); /* sources */
file_rec = sf_input("rec"); /* receivers */
file_dat = sf_output("out"); /* data */
if (snap) file_wfl = sf_output("wfl"); /* wavefield */
if (!cden) {
if (sf_getstring("cden")) {
file_den = sf_input ("den"); /* density */
} else {
cden = true;
if (verb) sf_warning("No density file provided, running with constant density");
}
}
at = sf_iaxa(file_wav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(file_vel,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(file_vel,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space */
ay = sf_iaxa(file_vel,3); sf_setlabel(ay,"y"); if(verb) sf_raxa(ay); /* space */
as = sf_iaxa(file_src,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(file_rec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ny = sf_n(ay); dy = sf_d(ay);
ns = sf_n(as);
nr = sf_n(ar);
/* other execution parameters */
if (snap) {
if (!sf_getint("jsnap",&jsnap)) jsnap=nt;
/* # of t steps at which to save wavefield */
}
if (!sf_getint("jdata",&jdata)) jdata=1;
/* # of t steps at which to save receiver data */
/* setup output data header */
sf_oaxa(file_dat,ar,1);
sf_setn(at,(nt-1)/jdata+1);
sf_setd(at,dt*jdata);
sf_oaxa(file_dat,at,2);
/* wavefield cut params */
/* setup output wavefield header */
if (snap) {
if (!sf_getint ("nqz",&nqz)) nqz=sf_n(az); /* Saved wfld window nz */
if (!sf_getint ("nqx",&nqx)) nqx=sf_n(ax); /* Saved wfld window nx */
if (!sf_getint ("nqy",&nqy)) nqy=sf_n(ay); /* Saved wfld window ny */
if (!sf_getfloat("oqz",&oqz)) oqz=sf_o(az); /* Saved wfld window oz */
if (!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax); /* Saved wfld window ox */
if (!sf_getfloat("oqy",&oqy)) oqy=sf_o(ay); /* Saved wfld window oy */
if (!sf_getfloat("dqz",&dqz)) dqz=sf_d(az); /* Saved wfld window dz */
if (!sf_getfloat("dqx",&dqx)) dqx=sf_d(ax); /* Saved wfld window dx */
if (!sf_getfloat("dqy",&dqy)) dqy=sf_d(ay); /* Saved wfld window dy */
acz = sf_maxa(nqz,oqz,dqz); if (verb) sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); if (verb) sf_raxa(acx);
acy = sf_maxa(nqy,oqy,dqy); if (verb) sf_raxa(acy);
/* check if the imaging window fits in the wavefield domain */
sf_setn(at,(nt-1)/jsnap+1);
sf_setd(at,dt*jsnap);
if (verb) sf_raxa(at);
sf_oaxa(file_wfl,acz,1);
sf_oaxa(file_wfl,acx,2);
sf_oaxa(file_wfl,acy,3);
sf_oaxa(file_wfl,at,4);
}
/* 2-2N finite difference coefficient */
nop = fdorder/2; /* fd half-length stencil */
if (!sf_getint("nb",&nbd) || nbd<nop) nbd=nop;
if (dabc && hybrid && nbd<=nop) nbd = 2*nop;
/* expand domain for FD operators and ABC */
fdm = fdutil3d_init(verb,fsrf,az,ax,ay,nbd,1);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if (verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if (verb) sf_raxa(ax);
sf_setn(ay,fdm->nypad); sf_seto(ay,fdm->oypad); if (verb) sf_raxa(ay);
/* Precompute coefficients */
dt2 = dt*dt;
nzpad = nz+2*nbd; nxpad = nx+2*nbd; nypad = ny+2*nbd;
fdcoef_d2 = compute_fdcoef(nop,dz,dx,dy,optfd,SECOND_DERIV);
fdcoef_d1 = compute_fdcoef(nop,dz,dx,dy,optfd,FIRST_DERIV);
/* Allocate memories */
if (expl) ws = sf_floatalloc(1);
else ws = sf_floatalloc(ns);
vel = sf_floatalloc3(nzpad,nxpad,nypad);
if (!cden) rho = sf_floatalloc3(nzpad,nxpad,nypad);
u_dat = sf_floatalloc(nr);
src3d = pt3dalloc1(ns);
rec3d = pt3dalloc1(nr);
if (snap) oslice = sf_floatalloc2(sf_n(acz),sf_n(acx));
/* source and receiver position */
pt3dread1(file_src,src3d,ns,3); /* read format: (x,y,z) */
if (sinc) cssinc = sinc3d_make(ns,src3d,fdm);
else cslint = lint3d_make(ns,src3d,fdm);
pt3dread1(file_rec,rec3d,nr,3); /* read format: (x,y,z) */
if (sinc) crsinc = sinc3d_make(nr,rec3d,fdm);
else crlint = lint3d_make(nr,rec3d,fdm);
if (!sinc) fdbell3d_init(nbell);
/* temperary array */
tmp_array = sf_floatalloc3(nz,nx,ny);
/* read velocity and pad */
sf_floatread(tmp_array[0][0],nz*nx*ny,file_vel);
expand3d(tmp_array,vel,fdm);
/* read density and pad */
if (!cden) {
sf_floatread(tmp_array[0][0],nz*nx*ny,file_den);
expand3d(tmp_array,rho,fdm);
}
free(**tmp_array); free(*tmp_array); free(tmp_array);
/* A1 one-way ABC implicit scheme coefficients */
if (dabc) {
abc = abcone3d_make(nbd,dt,vel,fsrf,fdm);
if (hybrid)
damp = damp_make(nbd-nop); /* compute damping profiles for hybrid bc */
else
spo = sponge_make(fdm->nb);
}
/* allocate memory for wavefield variables */
u0 = sf_floatalloc3(nzpad,nxpad,nypad);
u1 = sf_floatalloc3(nzpad,nxpad,nypad);
/* initialize variables */
memset(u0[0][0],0,sizeof(float)*nzpad*nxpad*nypad);
memset(u1[0][0],0,sizeof(float)*nzpad*nxpad*nypad);
memset(u_dat,0,sizeof(float)*nr);
/* v = (v*dt)^2 */
for (ix=0;ix<nzpad*nxpad*nypad;ix++)
*(vel[0][0]+ix) *= *(vel[0][0]+ix)*dt2;
if (fsrf && !hybrid) {
for (iy=0; iy<nypad; iy++)
for (ix=0; ix<nxpad; ix++)
memset(vel[iy][ix],0,sizeof(float)*fdm->nb);
}
for (it=0; it<nt; it++) {
if (verb) sf_warning("it=%d;",it+1);
#if defined _OPENMP && _DEBUG
tic=omp_get_wtime();
#endif
step_forward(u0,u1,vel,rho,fdcoef_d2,fdcoef_d1,nop,nzpad,nxpad,nypad);
if (adj) { /* backward inject source wavelet */
if (expl) {
sf_seek(file_wav,(off_t)(nt-it-1)*sizeof(float),SEEK_SET);
sf_floatread(ws,1,file_wav);
ws[0] *= dt2;
if (sinc) sinc3d_inject1(u0,ws[0],cssinc);
else lint3d_inject1(u0,ws[0],cslint);
} else {
sf_seek(file_wav,(off_t)(nt-it-1)*ns*sizeof(float),SEEK_SET);
sf_floatread(ws,ns,file_wav);
for (is=0; is<ns; is++) ws[is] *= dt2;
if (sinc) sinc3d_inject(u0,ws,cssinc);
else lint3d_inject(u0,ws,cslint);
}
} else { /* forward inject source wavelet */
if (expl) {
sf_floatread(ws,1,file_wav);
ws[0] *= dt2;
if (sinc) sinc3d_inject1(u0,ws[0],cssinc);
else lint3d_inject1(u0,ws[0],cslint);
} else {
sf_floatread(ws,ns,file_wav);
for (is=0; is<ns; is++) ws[is] *= dt2;
if (sinc) sinc3d_inject(u0,ws,cssinc);
else lint3d_inject(u0,ws,cslint);
}
}
/* apply abc */
if (dabc) {
if (hybrid) apply_abc(u0,u1,nz,nx,ny,nbd,abc,nop,damp);
else {
abcone3d_apply(u0,u1,nop,abc,fdm);
sponge3d_apply(u0,spo,fdm);
sponge3d_apply(u1,spo,fdm);
}
}
/* loop over pointers */
ptr_tmp = u0; u0 = u1; u1 = ptr_tmp;
/* extract snapshot */
if (snap && it%jsnap==0) {
int fy = (floor)((sf_o(acy)-fdm->oypad)/fdm->dy);
int jy = floor(sf_d(acy)/fdm->dy);
float **ptr_slice;
for (iy=0; iy<sf_n(acy); iy++) {
ptr_slice = u0[fy+iy*jy];
cut3d_slice(ptr_slice,oslice,fdm,acz,acx);
sf_floatwrite(oslice[0],sf_n(acz)*sf_n(acx),file_wfl);
}
}
/* extract receiver data */
if (sinc) sinc3d_extract(u0,u_dat,crsinc);
else lint3d_extract(u0,u_dat,crlint);
sf_floatwrite(u_dat,nr,file_dat);
#if defined _OPENMP && _DEBUG
toc=omp_get_wtime();
fprintf(stderr,"%5.2gs",(float)(toc-tic));
#endif
}
#ifdef _OPENMP
wall_clock_time_e = omp_get_wtime();
#else
wall_clock_time_e = (double) clock() / CLOCKS_PER_SEC;
#endif
if (verb)
fprintf(stderr,"\nElapsed time: %lf s\n",wall_clock_time_e-wall_clock_time_s);
free(**u0); free(*u0); free(u0);
free(**u1); free(*u1); free(u1);
free(**vel); free(*vel); free(vel);
free(u_dat);
free(ws);
free(fdcoef_d2); free(fdcoef_d1);
if (snap) { free(*oslice); free(oslice); }
if(!cden) { free(**rho); free(*rho); free(rho); }
if (hybrid) free(damp);
free(src3d); free(rec3d);
return 0;
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,expl,dabc;
int jsnap,ntsnap,jdata;
/* OMP parameters */
#ifdef _OPENMP
int ompnth;
#endif
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fmag=NULL; /* magnetic permitivity */
sf_file Fele=NULL; /* electric susceptibility */
sf_file Fcdt=NULL; /* conductivity */
sf_file Fdat=NULL; /* data */
sf_file Fwfl=NULL; /* wavefield */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* cube axes */
sf_axis at,az,ax;
sf_axis as,ar;
int nt,nz,nx,ns,nr,nb;
int it,iz,ix;
float dt,dz,dx,idz,idx;
/* FDM structure */
fdm2d fdm=NULL;
abcone2d abc=NULL;
sponge spo=NULL;
/* I/O arrays */
float *ww=NULL; /* wavelet */
pt2d *ss=NULL; /* sources */
pt2d *rr=NULL; /* receivers */
float *dd=NULL; /* data */
float **tt=NULL;
float **vel=NULL; /* velocity */
float **mag=NULL;
float **ele=NULL;
float **cdt=NULL;
float **cdtele=NULL; /* temporary cdt*dt/2*ele */
float **magele=NULL; /* temporary dt*dt/mag*ele */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
float **um,**uo,**up,**ua,**ut; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
/* linear interpolation weights/indices */
lint2d cs,cr;
/* FD operator size */
float co,cax,cbx,caz,cbz;
/* wavefield cut params */
sf_axis acz=NULL,acx=NULL;
int nqz,nqx;
float oqz,oqx;
float dqz,dqx;
float **uc=NULL;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
/*------------------------------------------------------------*/
/* OMP parameters */
#ifdef _OPENMP
ompnth=omp_init();
#endif
/*------------------------------------------------------------*/
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
if(! sf_getbool("expl",&expl)) expl=false; /* "exploding reflector" */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* absorbing BC */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* I/O files */
Fwav = sf_input ("in" ); /* wavelet */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
/*------------------------------------------------------------*/
Fmag = sf_input ("mag"); /* magnetic permitivity */
Fele = sf_input ("ele"); /* electric susceptibility */
Fcdt = sf_input ("cdt"); /* conductivity */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* axes */
at = sf_iaxa(Fwav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(Fmag,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(Fmag,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ns = sf_n(as);
nr = sf_n(ar);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* other execution parameters */
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC
we exclude some of the code to maintain the same size of velocity model*/
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil_init(verb,fsrf,az,ax,nb,1);
/*sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);*/
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
dqz=sf_d(az);
dqx=sf_d(ax);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
/* check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc2(sf_n(acz),sf_n(acx));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,at, 3);
}
if(expl) {
ww = sf_floatalloc( 1);
} else {
ww = sf_floatalloc(ns);
}
dd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt2d*) sf_alloc(ns,sizeof(*ss));
rr = (pt2d*) sf_alloc(nr,sizeof(*rr));
pt2dread1(Fsou,ss,ns,2); /* read (x,z) coordinates */
pt2dread1(Frec,rr,nr,2); /* read (x,z) coordinates */
cs = lint2d_make(ns,ss,fdm);
cr = lint2d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
idz = 1/dz;
idx = 1/dx;
co = C0 * (idx*idx+idz*idz);
cax= CA * idx*idx;
cbx= CB * idx*idx;
caz= CA * idz*idz;
cbz= CB * idz*idz;
/*------------------------------------------------------------*/
tt = sf_floatalloc2(nz,nx);
vel = sf_floatalloc2(fdm->nzpad,fdm->nxpad);
mag = sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ele = sf_floatalloc2(fdm->nzpad,fdm->nxpad);
cdt = sf_floatalloc2(fdm->nzpad,fdm->nxpad);
cdtele =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
magele =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* input magnetic susceptibility*/
sf_floatread(tt[0],nz*nx,Fmag ); expand(tt,mag,fdm);
/* input electric susceptibility*/
sf_floatread(tt[0],nz*nx,Fele ); expand(tt,ele,fdm);
/* input conductivity*/
sf_floatread(tt[0],nz*nx,Fcdt ); expand(tt,cdt,fdm);
/*------------------------------------------------------------*/
/* cdtele = sigma*dt/2*epsilon */
/* magele = dt*dt/mu*epsilon */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
cdtele[ix][iz] = cdt[ix][iz]*dt/(2*(ele[ix][iz]));
magele[ix][iz] = dt*dt/(mag[ix][iz]*ele[ix][iz]);
vel[ix][iz] = 1./(sqrt(mag[ix][iz]*ele[ix][iz]));
}
}
if(fsrf) { /* free surface */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
cdtele[ix][iz]=0;
magele[ix][iz]=0;
}
}
}
/*------------------------------------------------------------*/
free(*tt); free(tt);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
um=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
uo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
up=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ua=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
um[ix][iz]=0;
uo[ix][iz]=0;
up[ix][iz]=0;
ua[ix][iz]=0;
}
}
/*------------------------------------------------------------*/
if(dabc) {
/* one-way abc setup */
abc = abcone2d_make(NOP,dt,vel,fsrf,fdm);
/* sponge abc setup */
spo = sponge_make(fdm->nb);
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"\b\b\b\b\b%d",it);
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,ua,uo,co,cax,caz,cbx,cbz,idx,idz)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
/* 4th order Laplacian operator */
ua[ix][iz] =
co * uo[ix ][iz ] +
cax*(uo[ix-1][iz ] + uo[ix+1][iz ]) +
cbx*(uo[ix-2][iz ] + uo[ix+2][iz ]) +
caz*(uo[ix ][iz-1] + uo[ix ][iz+1]) +
cbz*(uo[ix ][iz-2] + uo[ix ][iz+2]);
}
}
/* inject acceleration source */
if(expl) {
sf_floatread(ww, 1,Fwav);
lint2d_inject1(ua,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint2d_inject(ua,ww,cs);
}
/* step forward in time */
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,ua,uo,um,up,cdtele,magele)
#endif
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
up[ix][iz] = (2*uo[ix][iz]
- (1-cdtele[ix][iz])*um[ix][iz]
+ ua[ix][iz]*(magele[ix][iz]))/(1+cdtele[ix][iz]);
}
}
/* circulate wavefield arrays */
ut=um;
um=uo;
uo=up;
up=ut;
if(dabc) {
/* one-way abc apply */
abcone2d_apply(uo,um,NOP,abc,fdm);
sponge2d_apply(um,spo,fdm);
sponge2d_apply(uo,spo,fdm);
sponge2d_apply(up,spo,fdm);
}
/* extract data */
lint2d_extract(uo,dd,cr);
if(snap && it%jsnap==0) {
cut2d(uo,uc,fdm,acz,acx);
sf_floatwrite(uc[0],sf_n(acz)*sf_n(acx),Fwfl);
}
if( it%jdata==0)
sf_floatwrite(dd,nr,Fdat);
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(*um); free(um);
free(*up); free(up);
free(*uo); free(uo);
free(*ua); free(ua);
free(*uc); free(uc);
free(*mag); free(mag);
free(*ele); free(ele);
free(*cdt); free(cdt);
free(*vel); free(vel);
free(*cdtele); free(cdtele);
free(*magele); free(magele);
/*------------------------------------------------------------*/
free(ww);
free(ss);
free(rr);
free(dd);
/*------------------------------------------------------------*/
sf_close();
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,expl;
int jsnap,ntsnap;
int jdata;
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fvel=NULL; /* velocity */
sf_file Fref=NULL; /* reflectivity */
sf_file Fden=NULL; /* density */
sf_file Fdat=NULL; /* data (background) */
sf_file Fwfl=NULL; /* wavefield (background) */
sf_file Flid=NULL; /* data (scattered) */
sf_file Fliw=NULL; /* wavefield (scattered) */
/* I/O arrays */
float *ww=NULL; /* wavelet */
pt2d *ss=NULL; /* sources */
pt2d *rr=NULL; /* receivers */
float **vpin=NULL; /* velocity */
float **roin=NULL; /* density */
float **rfin=NULL; /* reflectivity */
float **vp=NULL; /* velocity in expanded domain */
float **ro=NULL; /* density in expanded domain */
float **ro1=NULL; /* normalized 1st derivative of density on axis 1 */
float **ro2=NULL; /* normalized 1st derivative of density on axis 2 */
float **rf=NULL; /* reflectivity in expanded domain */
float *bdd=NULL; /* data (background) */
float *sdd=NULL; /* data (scattered) */
float **vt=NULL; /* temporary vp*vp * dt*dt */
float **bum,**buo,**bup,**bua,**but; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
float **sum,**suo,**sup,**sua,**sut; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
/* cube axes */
sf_axis at,a1,a2,as,ar;
int nt,n1,n2,ns,nr,nb;
int it,i1,i2;
float dt,d1,d2,id1,id2,dt2;
/* linear interpolation weights/indices */
lint2d cs,cr;
fdm2d fdm;
abcone2d abc; /* abc */
sponge spo;
/* FD operator size */
float co,ca2,cb2,ca1,cb1;
int ompchunk;
#ifdef _OPENMP
int ompnth,ompath;
#endif
sf_axis ac1=NULL,ac2=NULL;
int nqz,nqx;
float oqz,oqx;
float dqz,dqx;
float **uc=NULL;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
if(! sf_getint("ompchunk",&ompchunk)) ompchunk=1;
/* OpenMP data chunk size */
#ifdef _OPENMP
if(! sf_getint("ompnth", &ompnth)) ompnth=0;
/* OpenMP available threads */
#pragma omp parallel
ompath=omp_get_num_threads();
if(ompnth<1) ompnth=ompath;
omp_set_num_threads(ompnth);
sf_warning("using %d threads of a total of %d",ompnth,ompath);
#endif
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
if(! sf_getbool("expl",&expl)) expl=false; /* "exploding reflector" */
Fwav = sf_input ("in" ); /* wavelet */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fvel = sf_input ("vel"); /* velocity */
Fden = sf_input ("den"); /* density */
Fref = sf_input ("ref"); /* reflectivity */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
Fliw = sf_output("liw"); /* wavefield (scattered) */
Flid = sf_output("lid"); /* data (scattered) */
/* axes */
at = sf_iaxa(Fwav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
a1 = sf_iaxa(Fvel,1); sf_setlabel(a1,"z"); if(verb) sf_raxa(a1); /* depth */
a2 = sf_iaxa(Fvel,2); sf_setlabel(a2,"x"); if(verb) sf_raxa(a2); /* space */
nt = sf_n(at); dt = sf_d(at);
ns = sf_n(as);
nr = sf_n(ar);
n1 = sf_n(a1); d1 = sf_d(a1);
n2 = sf_n(a2); d2 = sf_d(a2);
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_oaxa(Flid,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
sf_oaxa(Flid,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(a1);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(a2);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(a1);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(a2);
dqz=sf_d(a1);
dqx=sf_d(a2);
ac1 = sf_maxa(nqz,oqz,dqz);
ac2 = sf_maxa(nqx,oqx,dqx);
/* check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc2(sf_n(ac1),sf_n(ac2));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
/* sf_setn(at,nt/jsnap);
sf_setd(at,dt*jsnap); */
sf_oaxa(Fwfl,ac1,1);
sf_oaxa(Fwfl,ac2,2);
sf_oaxa(Fwfl,at, 3);
sf_oaxa(Fliw,ac1,1);
sf_oaxa(Fliw,ac2,2);
sf_oaxa(Fliw,at, 3);
}
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil_init(verb,fsrf,a1,a2,nb,ompchunk);
sf_setn(a1,fdm->nzpad); sf_seto(a1,fdm->ozpad); if(verb) sf_raxa(a1);
sf_setn(a2,fdm->nxpad); sf_seto(a2,fdm->oxpad); if(verb) sf_raxa(a2);
/*------------------------------------------------------------*/
if(expl) ww = sf_floatalloc( 1);
else ww = sf_floatalloc(ns);
bdd =sf_floatalloc(nr);
sdd =sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt2d*) sf_alloc(ns,sizeof(*ss));
rr = (pt2d*) sf_alloc(nr,sizeof(*rr));
pt2dread1(Fsou,ss,ns,2); /* read (x,z) coordinates */
pt2dread1(Frec,rr,nr,2); /* read (x,z) coordinates */
cs = lint2d_make(ns,ss,fdm);
cr = lint2d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
dt2 = dt*dt;
id1 = 1/d1;
id2 = 1/d2;
co = C0 * (id2*id2+id1*id1);
ca2= CA * id2*id2;
cb2= CB * id2*id2;
ca1= CA * id1*id1;
cb1= CB * id1*id1;
/*------------------------------------------------------------*/
/* input density */
roin=sf_floatalloc2(n1, n2 );
ro =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ro1 =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ro2 =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(roin[0],n1*n2,Fden);
expand(roin,ro,fdm);
/* normalized density derivatives */
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for(i1=NOP; i1<fdm->nzpad-NOP; i1++) {
ro1[i2][i1] = D1(ro,i2,i1,id1) / ro[i2][i1];
ro2[i2][i1] = D2(ro,i2,i1,id2) / ro[i2][i1];
}
}
free(*roin); free(roin);
/*------------------------------------------------------------*/
/* input velocity */
vpin=sf_floatalloc2(n1, n2 );
vp =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vt =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(vpin[0],n1*n2,Fvel);
expand(vpin,vp,fdm);
free(*vpin); free(vpin);
/*------------------------------------------------------------*/
/* input reflectivity */
rfin=sf_floatalloc2(n1, n2 );
rf =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(rfin[0],n1*n2,Fref);
expand(rfin,rf,fdm);
free(*rfin); free(rfin);
for (i2=0; i2<fdm->nxpad; i2++) {
for(i1=0; i1<fdm->nzpad; i1++) {
vt[i2][i1] = vp[i2][i1] * vp[i2][i1] * dt2;
}
}
/* free surface */
if(fsrf) {
for (i2=0; i2<fdm->nxpad; i2++) {
for(i1=0; i1<fdm->nb; i1++) {
vt[i2][i1]=0;
}
}
}
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
bum=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
buo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
bup=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
bua=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sum=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
suo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sup=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sua=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (i2=0; i2<fdm->nxpad; i2++) {
for(i1=0; i1<fdm->nzpad; i1++) {
bum[i2][i1]=0;
buo[i2][i1]=0;
bup[i2][i1]=0;
bua[i2][i1]=0;
sum[i2][i1]=0;
suo[i2][i1]=0;
sup[i2][i1]=0;
sua[i2][i1]=0;
}
}
/*------------------------------------------------------------*/
/* one-way abc setup */
abc = abcone2d_make(NOP,dt,vp,fsrf,fdm);
/* sponge abc setup */
spo = sponge_make(fdm->nb);
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"\b\b\b\b\b%d",it);
#ifdef _OPENMP
#pragma omp parallel for schedule(dynamic,fdm->ompchunk) private(i2,i1) shared(fdm,bua,buo,sua,suo,co,ca2,ca1,cb2,cb1,id2,id1)
#endif
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for(i1=NOP; i1<fdm->nzpad-NOP; i1++) {
/* 4th order Laplacian operator */
bua[i2][i1] =
co * buo[i2 ][i1 ] +
ca2*(buo[i2-1][i1 ] + buo[i2+1][i1 ]) +
cb2*(buo[i2-2][i1 ] + buo[i2+2][i1 ]) +
ca1*(buo[i2 ][i1-1] + buo[i2 ][i1+1]) +
cb1*(buo[i2 ][i1-2] + buo[i2 ][i1+2]);
sua[i2][i1] =
co * suo[i2 ][i1 ] +
ca2*(suo[i2-1][i1 ] + suo[i2+1][i1 ]) +
cb2*(suo[i2-2][i1 ] + suo[i2+2][i1 ]) +
ca1*(suo[i2 ][i1-1] + suo[i2 ][i1+1]) +
cb1*(suo[i2 ][i1-2] + suo[i2 ][i1+2]);
/* density term */
bua[i2][i1] -= (
D1(buo,i2,i1,id1) * ro1[i2][i1] +
D2(buo,i2,i1,id2) * ro2[i2][i1] );
sua[i2][i1] -= (
D1(suo,i2,i1,id1) * ro1[i2][i1] +
D2(suo,i2,i1,id2) * ro2[i2][i1] );
}
}
/* inject acceleration source */
if(expl) {
sf_floatread(ww, 1,Fwav);
lint2d_inject1(bua,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint2d_inject(bua,ww,cs);
}
/* single scattering */
#ifdef _OPENMP
#pragma omp parallel for schedule(dynamic,ompchunk) private(i2,i1) shared(fdm,buo,sua,rf)
#endif
for (i2=0; i2<fdm->nxpad; i2++) {
for (i1=0; i1<fdm->nzpad; i1++) {
sua[i2][i1] -= bua[i2][i1] * 2*rf[i2][i1];
}
}
/* step forward in time */
#ifdef _OPENMP
#pragma omp parallel for schedule(dynamic,fdm->ompchunk) private(i2,i1) shared(fdm,bua,buo,bum,bup,sua,suo,sum,sup,vt,dt2)
#endif
for (i2=0; i2<fdm->nxpad; i2++) {
for(i1=0; i1<fdm->nzpad; i1++) {
bup[i2][i1] = 2*buo[i2][i1]
- bum[i2][i1]
+ bua[i2][i1] * vt[i2][i1];
sup[i2][i1] = 2*suo[i2][i1]
- sum[i2][i1]
+ sua[i2][i1] * vt[i2][i1];
}
}
/* circulate wavefield arrays */
but=bum;
bum=buo;
buo=bup;
bup=but;
sut=sum;
sum=suo;
suo=sup;
sup=sut;
/* one-way abc apply*/
abcone2d_apply(buo,bum,NOP,abc,fdm);
sponge2d_apply(bum, spo,fdm);
sponge2d_apply(buo, spo,fdm);
abcone2d_apply(suo,sum,NOP,abc,fdm);
sponge2d_apply(sum, spo,fdm);
sponge2d_apply(suo, spo,fdm);
/* extract data at receivers */
lint2d_extract(buo,bdd,cr);
lint2d_extract(suo,sdd,cr);
if( it%jdata==0) {
sf_floatwrite(bdd,nr,Fdat);
sf_floatwrite(sdd,nr,Flid);
}
/* extract wavefield in the "box" */
if(snap && it%jsnap==0) {
cut2d(buo,uc,fdm,ac1,ac2);
sf_floatwrite(uc[0],sf_n(ac1)*sf_n(ac2),Fwfl);
cut2d(suo,uc,fdm,ac1,ac2);
sf_floatwrite(uc[0],sf_n(ac1)*sf_n(ac2),Fliw);
}
}
if(verb) fprintf(stderr,"\n");
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,ssou,dabc,opot;
int jsnap,ntsnap,jdata;
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fccc=NULL; /* velocity */
sf_file Fden=NULL; /* density */
sf_file Fdat=NULL; /* data */
sf_file Fwfl=NULL; /* wavefield */
/* cube axes */
sf_axis at,ax,ay,az;
sf_axis as,ar,ac;
int nt,nz,nx,ny,ns,nr,nc,nb;
int it,iz,ix,iy;
float dt,dz,dx,dy,idz,idx,idy;
/* FDM structure */
fdm3d fdm=NULL;
abcone3d /* abcp=NULL, */ abcs=NULL;
sponge spo=NULL;
/* I/O arrays */
float***ww=NULL; /* wavelet */
pt3d *ss=NULL; /* sources */
pt3d *rr=NULL; /* receivers */
float **dd=NULL; /* data */
/*------------------------------------------------------------*/
float ***tt=NULL;
float ***ro=NULL; /* density */
/* orthorombic footprint - 9 coefficients */
/* c11 c12 c13
. c22 c23
. . c33
c44
c55
c66 */
float ***c11=NULL;
float ***c22=NULL;
float ***c33=NULL;
float ***c44=NULL;
float ***c55=NULL;
float ***c66=NULL;
float ***c12=NULL;
float ***c13=NULL;
float ***c23=NULL;
float ***vp,***vs;
float ***qp=NULL,***qsx=NULL,***qsy=NULL,***qsz=NULL;
/*------------------------------------------------------------*/
/* displacement: um = U @ t-1; uo = U @ t; up = U @ t+1 */
float ***umz,***uoz,***upz,***uaz,***utz;
float ***umx,***uox,***upx,***uax,***utx;
float ***umy,***uoy,***upy,***uay,***uty;
/* stress/strain tensor */
float ***tzz,***txx,***tyy,***txy,***tyz,***tzx;
float szz, sxx, syy, sxy, syz, szx;
/*------------------------------------------------------------*/
/* linear interpolation weights/indices */
lint3d cs,cr;
/* Gaussian bell */
int nbell;
/* wavefield cut params */
sf_axis acz=NULL,acx=NULL,acy=NULL;
int nqz,nqx,nqy;
float oqz,oqx,oqy;
float dqz,dqx,dqy;
float ***uc=NULL;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
/*------------------------------------------------------------*/
/* OMP parameters */
#ifdef _OPENMP
omp_init();
#endif
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* execution flags */
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
if(! sf_getbool("ssou",&ssou)) ssou=false; /* stress source */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* absorbing BC */
if(! sf_getbool("opot",&opot)) opot=false; /* output potentials */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* I/O files */
Fwav = sf_input ("in" ); /* wavelet */
Fccc = sf_input ("ccc"); /* stiffness */
Fden = sf_input ("den"); /* density */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* axes */
at = sf_iaxa(Fwav,3); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(Fccc,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(Fccc,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space x */
ay = sf_iaxa(Fccc,3); sf_setlabel(ay,"y"); if(verb) sf_raxa(ay); /* space y */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ny = sf_n(ay); dy = sf_d(ay);
ns = sf_n(as);
nr = sf_n(ar);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* other execution parameters */
if(! sf_getint("nbell",&nbell)) nbell=5; /* bell size */
if(verb) sf_warning("nbell=%d",nbell);
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil3d_init(verb,fsrf,az,ax,ay,nb,1);
fdbell3d_init(nbell);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);
sf_setn(ay,fdm->nypad); sf_seto(ay,fdm->oypad); if(verb) sf_raxa(ay);
/*------------------------------------------------------------*/
/* 3D vector components */
nc=3;
if(opot) {
ac=sf_maxa(nc+1,0,1);
} else {
ac=sf_maxa(nc ,0,1);
}
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_oaxa(Fdat,ac,2);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,3);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getint ("nqy",&nqy)) nqy=sf_n(ay);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
if(!sf_getfloat("oqy",&oqy)) oqy=sf_o(ay);
dqz=sf_d(az);
dqx=sf_d(ax);
dqy=sf_d(ay);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
acy = sf_maxa(nqy,oqy,dqy); sf_raxa(acy);
/* TODO: check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc3(sf_n(acz),sf_n(acx),sf_n(acy));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,acy,3);
sf_oaxa(Fwfl,ac, 4);
sf_oaxa(Fwfl,at, 5);
}
/*------------------------------------------------------------*/
/* source array */
ww=sf_floatalloc3(ns,nc,nt);
sf_floatread(ww[0][0],nt*nc*ns,Fwav);
/* data array */
if(opot) {
dd=sf_floatalloc2(nr,nc+1);
} else {
dd=sf_floatalloc2(nr,nc );
}
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt3d*) sf_alloc(ns,sizeof(*ss));
rr = (pt3d*) sf_alloc(nr,sizeof(*rr));
pt3dread1(Fsou,ss,ns,3); /* read (x,y,z) coordinates */
pt3dread1(Frec,rr,nr,3); /* read (x,y,z) coordinates */
cs = lint3d_make(ns,ss,fdm);
cr = lint3d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
/* idz = 2/dz;*/
/* idx = 2/dx;*/
/* idy = 2/dy;*/
idz = 1/dz;
idx = 1/dx;
idy = 1/dy;
/*------------------------------------------------------------*/
tt = sf_floatalloc3(nz,nx,ny);
ro =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c11=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c22=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c33=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c44=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c55=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c66=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c12=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c13=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
c23=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
/* input density */
sf_floatread(tt[0][0],nz*nx*ny,Fden); expand3d(tt,ro ,fdm);
/* input stiffness */
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c11,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c22,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c33,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c44,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c55,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c66,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c12,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c13,fdm);
sf_floatread(tt[0][0],nz*nx*ny,Fccc ); expand3d(tt,c23,fdm);
free(**tt); free(*tt); free(tt);
/*------------------------------------------------------------*/
if(dabc) {
/* one-way abc setup */
vp = sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
vs = sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vp[iy][ix][iz] = sqrt( c11[iy][ix][iz]/ro[iy][ix][iz] );
vs[iy][ix][iz] = sqrt( c55[iy][ix][iz]/ro[iy][ix][iz] );
}
}
}
/* abcp = abcone3d_make(NOP,dt,vp,fsrf,fdm); */
abcs = abcone3d_make(NOP,dt,vs,fsrf,fdm);
free(**vp); free(*vp); free(vp);
free(**vs); free(*vs); free(vs);
/* sponge abc setup */
spo = sponge_make(fdm->nb);
}
/*------------------------------------------------------------*/
/* precompute 1/ro * dt^2 */
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
ro[iy][ix][iz] = dt*dt/ro[iy][ix][iz];
}
}
}
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
umz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uoz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
upz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uaz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
umx=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uox=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
upx=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uax=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
umy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uoy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
upy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uay=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
tzz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
tyy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
txx=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
txy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
tyz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
tzx=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
umz[iy][ix][iz]=0; umx[iy][ix][iz]=0; umy[iy][ix][iz]=0;
uoz[iy][ix][iz]=0; uox[iy][ix][iz]=0; uoy[iy][ix][iz]=0;
upz[iy][ix][iz]=0; upx[iy][ix][iz]=0; upy[iy][ix][iz]=0;
uaz[iy][ix][iz]=0; uax[iy][ix][iz]=0; uay[iy][ix][iz]=0;
}
}
}
if(opot) {
qp =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
qsx=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
qsy=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
qsz=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"\b\b\b\b\b%d",it);
/*------------------------------------------------------------*/
/* from displacement to strain */
/*------------------------------------------------------------*/
/*
* exx = Fx(ux)
* eyy = Fy(uy)
* ezz = Fz(uz)
* exy = By(ux) + Bx(uy)
* eyz = Bz(uy) + By(uz)
* ezx = Bx(uz) + Bz(ux)
*/
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz) \
shared(fdm,txx,tyy,tzz,txy,tyz,tzx,uox,uoy,uoz,idx,idy,idz)
#endif
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
txx[iy][ix][iz] = Dx(uox,ix,iy,iz,idx);
tyy[iy][ix][iz] = Dy(uoy,ix,iy,iz,idy);
tzz[iy][ix][iz] = Dz(uoz,ix,iy,iz,idz);
txy[iy][ix][iz] = Dy(uox,ix,iy,iz,idy) + Dx(uoy,ix,iy,iz,idx);
tyz[iy][ix][iz] = Dz(uoy,ix,iy,iz,idz) + Dy(uoz,ix,iy,iz,idy);
tzx[iy][ix][iz] = Dx(uoz,ix,iy,iz,idx) + Dz(uox,ix,iy,iz,idz);
}
}
}
/*------------------------------------------------------------*/
/* from strain to stress */
/*------------------------------------------------------------*/
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz,sxx,syy,szz,sxy,syz,szx) \
shared(fdm,txx,tyy,tzz,txy,tyz,tzx,c11,c22,c33,c44,c55,c66,c12,c13,c23)
#endif
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
sxx = c11[iy][ix][iz] * txx[iy][ix][iz]
+ c12[iy][ix][iz] * tyy[iy][ix][iz]
+ c13[iy][ix][iz] * tzz[iy][ix][iz];
syy = c12[iy][ix][iz] * txx[iy][ix][iz]
+ c22[iy][ix][iz] * tyy[iy][ix][iz]
+ c23[iy][ix][iz] * tzz[iy][ix][iz];
szz = c13[iy][ix][iz] * txx[iy][ix][iz]
+ c23[iy][ix][iz] * tyy[iy][ix][iz]
+ c33[iy][ix][iz] * tzz[iy][ix][iz];
sxy = c66[iy][ix][iz] * txy[iy][ix][iz];
syz = c44[iy][ix][iz] * tyz[iy][ix][iz];
szx = c55[iy][ix][iz] * tzx[iy][ix][iz];
txx[iy][ix][iz] = sxx;
tyy[iy][ix][iz] = syy;
tzz[iy][ix][iz] = szz;
txy[iy][ix][iz] = sxy;
tyz[iy][ix][iz] = syz;
tzx[iy][ix][iz] = szx;
}
}
}
/*------------------------------------------------------------*/
/* free surface */
/*------------------------------------------------------------*/
if(fsrf) {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz) \
shared(fdm,txx,tyy,tzz,txy,tyz,tzx)
#endif
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
txx[iy][ix][iz]=0;
tyy[iy][ix][iz]=0;
tzz[iy][ix][iz]=0;
txy[iy][ix][iz]=0;
tyz[iy][ix][iz]=0;
tzx[iy][ix][iz]=0;
}
}
}
}
/*------------------------------------------------------------*/
/* inject stress source */
/*------------------------------------------------------------*/
if(ssou) {
lint3d_bell(tzz,ww[it][0],cs);
lint3d_bell(txx,ww[it][1],cs);
lint3d_bell(tyy,ww[it][2],cs);
}
/*------------------------------------------------------------*/
/* from stress to acceleration */
/*------------------------------------------------------------*/
/*
* ax = Bx(txx) + Fy(txy) + Fz(txz)
* ay = Fx(txy) + By(tyy) + Fz(tyz)
* az = Fx(txz) + Fy(tyz) + Bz(tzz)
*/
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz) \
shared(fdm,txx,tyy,tzz,txy,tyz,tzx,uax,uay,uaz,idx,idy,idz)
#endif
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
uax[iy][ix][iz] = Dx( txx,ix,iy,iz,idx ) + Dy( txy,ix,iy,iz,idy ) + Dz( tzx,ix,iy,iz,idz ) ;
uay[iy][ix][iz] = Dx( txy,ix,iy,iz,idx ) + Dy( tyy,ix,iy,iz,idy ) + Dz( tyz,ix,iy,iz,idz ) ;
uaz[iy][ix][iz] = Dx( tzx,ix,iy,iz,idx ) + Dy( tyz,ix,iy,iz,idy ) + Dz( tzz,ix,iy,iz,idz ) ;
}
}
}
/*------------------------------------------------------------*/
/* inject acceleration source */
/*------------------------------------------------------------*/
if(!ssou) {
lint3d_bell(uaz,ww[it][0],cs);
lint3d_bell(uax,ww[it][1],cs);
lint3d_bell(uay,ww[it][2],cs);
}
/*------------------------------------------------------------*/
/* step forward in time */
/*------------------------------------------------------------*/
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz) \
shared(fdm,uox,uoy,uoz,umx,umy,umz,upx,upy,upz,uax,uay,uaz,ro)
#endif
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
upx[iy][ix][iz] = 2*uox[iy][ix][iz]
- umx[iy][ix][iz]
+ uax[iy][ix][iz] * ro[iy][ix][iz];
upy[iy][ix][iz] = 2*uoy[iy][ix][iz]
- umy[iy][ix][iz]
+ uay[iy][ix][iz] * ro[iy][ix][iz];
upz[iy][ix][iz] = 2*uoz[iy][ix][iz]
- umz[iy][ix][iz]
+ uaz[iy][ix][iz] * ro[iy][ix][iz];
}
}
}
/* circulate wavefield arrays */
utz=umz; uty=umy; utx=umx;
umz=uoz; umy=uoy; umx=uox;
uoz=upz; uoy=upy; uox=upx;
upz=utz; upy=uty; upx=utx;
if(dabc) {
/* one-way ABC */
/* abcone3d_apply(uoz,umz,NOP,abcp,fdm); */
/* abcone3d_apply(uox,umx,NOP,abcp,fdm); */
/* abcone3d_apply(uoy,umy,NOP,abcp,fdm); */
abcone3d_apply(uoz,umz,NOP,abcs,fdm);
abcone3d_apply(uox,umx,NOP,abcs,fdm);
abcone3d_apply(uoy,umy,NOP,abcs,fdm);
/* sponge ABC */
sponge3d_apply(umz,spo,fdm);
sponge3d_apply(uoz,spo,fdm);
sponge3d_apply(umx,spo,fdm);
sponge3d_apply(uox,spo,fdm);
sponge3d_apply(umy,spo,fdm);
sponge3d_apply(uoy,spo,fdm);
}
/*------------------------------------------------------------*/
/* cut wavefield and save */
/*------------------------------------------------------------*/
if(opot) {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iy,iz) \
shared(fdm,uox,uoy,uoz,idx,idy,idz)
#endif
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
qp [iy][ix][iz] = Dx( uox,ix,iy,iz,idx )
+ Dy( uoy,ix,iy,iz,idy )
+ Dz( uoz,ix,iy,iz,idz );
qsx[iy][ix][iz] = Dy( uoz,ix,iy,iz,idy ) - Dz( uoy,ix,iy,iz,idz );
qsy[iy][ix][iz] = Dz( uox,ix,iy,iz,idz ) - Dx( uoz,ix,iy,iz,idx );
qsz[iy][ix][iz] = Dx( uoy,ix,iy,iz,idx ) - Dy( uox,ix,iy,iz,idy );
}
}
}
if(snap && it%jsnap==0) {
cut3d(qp ,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
cut3d(qsz,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
cut3d(qsx,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
cut3d(qsy,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
}
lint3d_extract(qp , dd[0],cr);
lint3d_extract(qsx, dd[1],cr);
lint3d_extract(qsy, dd[2],cr);
lint3d_extract(qsz, dd[3],cr);
if(it%jdata==0) sf_floatwrite(dd[0],nr*(nc+1),Fdat);
} else {
if(snap && it%jsnap==0) {
cut3d(uoz,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
cut3d(uox,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
cut3d(uoy,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acx)*sf_n(acy)*sf_n(acz),Fwfl);
}
lint3d_extract(uoz,dd[0],cr);
lint3d_extract(uox,dd[1],cr);
lint3d_extract(uoy,dd[2],cr);
if(it%jdata==0) sf_floatwrite(dd[0],nr*nc,Fdat);
}
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(**ww); free(*ww); free(ww);
free(ss);
free(rr);
free(*dd); free(dd);
free(**ro); free(*ro); free(ro);
free(**c11); free(*c11); free(c11);
free(**c22); free(*c22); free(c22);
free(**c33); free(*c33); free(c33);
free(**c44); free(*c44); free(c44);
free(**c55); free(*c55); free(c55);
free(**c66); free(*c66); free(c66);
free(**c12); free(*c12); free(c12);
free(**c13); free(*c13); free(c13);
free(**c23); free(*c23); free(c23);
free(**umz); free(*umz); free(umz);
free(**uoz); free(*uoz); free(uoz);
free(**upz); free(*upz); free(upz);
free(**uaz); free(*uaz); free(uaz);
free(**umx); free(*umx); free(umx);
free(**uox); free(*uox); free(uox);
free(**upx); free(*upx); free(upx);
free(**uax); free(*uax); free(uax);
free(**umy); free(*umy); free(umy);
free(**uoy); free(*uoy); free(uoy);
free(**upy); free(*upy); free(upy);
free(**uay); free(*uay); free(uay);
free(**tzz); free(*tzz); free(tzz);
free(**txx); free(*txx); free(txx);
free(**tyy); free(*tyy); free(tyy);
free(**txy); free(*txy); free(txy);
free(**tyz); free(*tyz); free(tyz);
free(**tzx); free(*tzx); free(tzx);
if (snap) {
free(**uc); free(*uc); free(uc);
}
if(opot) {
free(**qp); free(*qp); free(qp);
free(**qsx); free(*qsx); free(qsx);
free(**qsy); free(*qsy); free(qsy);
free(**qsz); free(*qsz); free(qsz);
}
/*------------------------------------------------------------*/
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,expl,dabc,sout,uses;
int jsnap,ntsnap,jdata;
char *atype;
#ifdef _OPENMP
int ompnth=1;
#endif
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fvel=NULL; /* velocity */
sf_file Fang=NULL; /* angles */
sf_file Fdat=NULL; /* data */
sf_file Fwfl=NULL; /* wavefield */
/* cube axes */
sf_axis at,az,ax;
sf_axis as,ar;
int nt,nz,nx,ns,nr,nb;
int it,iz,ix;
float dt,dz,dx,dt2;
/* FDM structure */
fdm2d fdm=NULL;
abcone2d abc=NULL;
sponge spo=NULL;
/* I/O arrays */
float *ww=NULL; /* wavelet */
pt2d *ss=NULL; /* sources */
pt2d *rr=NULL; /* receivers */
float *dd=NULL; /* data */
float **tt=NULL;
float **vp=NULL; /* velocity */
float **vpn=NULL;
float **vpz=NULL;
float **vpx=NULL;
float **vsz=NULL;
float **tht=NULL,**sit=NULL,**cot=NULL;
float st,ct;
float **pm=NULL,**po=NULL,**pp=NULL,**pa=NULL,**pt=NULL; /* main wavefield */
float **qm=NULL,**qo=NULL,**qp=NULL,**qa=NULL,**qt=NULL; /* auxiliary wavefield */
float **sf=NULL; /* "stress" field */
/* linear inteppolation weights/indices */
lint2d cs,cr;
/* FD operator size */
float cox,cax,cbx,c1x,c2x;
float coz,caz,cbz,c1z,c2z;
/* wavefield cut params */
sf_axis acz=NULL,acx=NULL;
int nqz,nqx;
float oqz,oqx;
float dqz,dqx;
float **pc=NULL;
float H1p,H2p,H1q,H2q;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
/* select anisotropy model */
if (NULL == (atype = sf_getstring("atype"))) atype = "i";
switch(atype[0]) {
case 't':
sf_warning("TTI model");
break;
case 'v':
sf_warning("VTI model");
break;
case 'i':
default:
sf_warning("ISO model");
break;
}
/*------------------------------------------------------------*/
/* OMP parameters */
#ifdef _OPENMP
ompnth=omp_init();
#endif
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface */
if(! sf_getbool("expl",&expl)) expl=false; /* "exploding reflector" */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* absorbing BC */
if(! sf_getbool("sout",&sout)) sout=false; /* stress output */
if(! sf_getbool("uses",&uses)) uses=false; /* use vsz */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* I/O files */
Fwav = sf_input ("in" ); /* wavelet */
Fvel = sf_input ("vel"); /* velocity */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fang = sf_input ("ang"); /* angles */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
/*------------------------------------------------------------*/
/* axes */
at = sf_iaxa(Fwav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(Fvel,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(Fvel,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ns = sf_n(as);
nr = sf_n(ar);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* other execution parameters */
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
dqz=sf_d(az);
dqx=sf_d(ax);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
/* check if the imaging window fits in the wavefield domain */
pc=sf_floatalloc2(sf_n(acz),sf_n(acx));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,at, 3);
}
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil_init(verb,fsrf,az,ax,nb,1);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);
/*------------------------------------------------------------*/
if(expl) {
ww = sf_floatalloc( 1);
} else {
ww = sf_floatalloc(ns);
}
dd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt2d*) sf_alloc(ns,sizeof(*ss));
rr = (pt2d*) sf_alloc(nr,sizeof(*rr));
pt2dread1(Fsou,ss,ns,2); /* read (x,z) coordinates */
pt2dread1(Frec,rr,nr,2); /* read (x,z) coordinates */
cs = lint2d_make(ns,ss,fdm);
cr = lint2d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
cox = C0 / (dx*dx);
cax = CA / (dx*dx);
cbx = CB / (dx*dx);
c1x = C1 / dx;
c2x = C2 / dx;
coz = C0 / (dz*dz);
caz = CA / (dz*dz);
cbz = CB / (dz*dz);
c1z = C1 / dz;
c2z = C2 / dz;
/* precompute dt^2*/
dt2 = dt*dt;
/*------------------------------------------------------------*/
tt = sf_floatalloc2(nz,nx);
/*------------------------------------------------------------*/
/* input velocity */
vp =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vpz =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fvel );
expand(tt,vpz,fdm); /* VPz */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vp [ix][iz] = vpz[ix][iz];
vpz[ix][iz] = vpz[ix][iz] * vpz[ix][iz];
}
}
if(fsrf) { /* free surface */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
vpz[ix][iz]=0;
}
}
}
if(atype[0] != 'i') {
vpn =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fvel );
expand(tt,vpn,fdm); /* VPn */
vpx =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fvel );
expand(tt,vpx,fdm); /* VPx */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vpn[ix][iz] = vpn[ix][iz] * vpn[ix][iz];
vpx[ix][iz] = vpx[ix][iz] * vpx[ix][iz];
}
}
if(fsrf) { /* free surface */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
vpn[ix][iz]=0;
vpx[ix][iz]=0;
}
}
}
if(uses) {
vsz =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fvel );
expand(tt,vsz,fdm); /* VSz */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vsz[ix][iz] = vsz[ix][iz] * vsz[ix][iz];
}
}
}
}
/*------------------------------------------------------------*/
if( atype[0]=='t') {
/* input tilt angle */
tht =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sit =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
cot =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fang);
expand(tt,tht,fdm);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
tht[ix][iz] *= SF_PI/180.;
sit[ix][iz] = sinf(tht[ix][iz]);
cot[ix][iz] = cosf(tht[ix][iz]);
}
}
free(*tht); free(tht);
}
/*------------------------------------------------------------*/
free(*tt); free(tt);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
pm=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
po=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
pp=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
pa=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
pm[ix][iz]=0;
po[ix][iz]=0;
pp[ix][iz]=0;
pa[ix][iz]=0;
}
}
if(atype[0] != 'i') {
qm=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qp=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qa=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
qm[ix][iz]=0;
qo[ix][iz]=0;
qp[ix][iz]=0;
qa[ix][iz]=0;
}
}
if(sout) sf=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
}
/*------------------------------------------------------------*/
if(dabc) {
abc = abcone2d_make(NOP,dt,vp,fsrf,fdm); /* one-way */
spo = sponge_make(fdm->nb); /* sponge */
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"\b\b\b\b\b%d",it);
/* compute acceleration */
switch(atype[0]) {
case 't':
if(uses) {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz,H1p,H2p,H1q,H2q,st,ct) \
shared(fdm,pa,po,qa,qo, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z, \
vpn,vpz,vpx,vsz, \
sit,cot)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
st=sit[ix][iz];
ct=cot[ix][iz];
H1p = H1(po,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
H2p = H2(po,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
H1q = H1(qo,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
H2q = H2(qo,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
/* p - main field */
pa[ix][iz] =
H1p * vsz[ix][iz] +
H2p * vpx[ix][iz] +
H1q * vpz[ix][iz] -
H1q * vsz[ix][iz];
/* q - auxiliary field */
qa[ix][iz] =
H2p * vpn[ix][iz] -
H2p * vsz[ix][iz] +
H1q * vpz[ix][iz] +
H2q * vsz[ix][iz];
}
}
} else {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz,H2p,H1q,st,ct) \
shared(fdm,pa,po,qa,qo, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z, \
vpn,vpz,vpx, \
sit,cot)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
st=sit[ix][iz];
ct=cot[ix][iz];
H2p = H2(po,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
H1q = H1(qo,ix,iz, \
st,ct, \
cox,cax,cbx,c1x,c2x, \
coz,caz,cbz,c1z,c2z);
/* p - main field */
pa[ix][iz] =
H2p * vpx[ix][iz] +
H1q * vpz[ix][iz];
/* q - auxiliary field */
qa[ix][iz] =
H2p * vpn[ix][iz] +
H1q * vpz[ix][iz];
}
}
}
break;
case 'v':
if(uses) {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz,H1p,H2p,H1q,H2q) \
shared(fdm,pa,po,qa,qo, \
cox,cax,cbx, \
coz,caz,cbz, \
vpn,vpz,vpx,vsz)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
H1p = Dzz(po,ix,iz,coz,caz,cbz);
H1q = Dzz(qo,ix,iz,coz,caz,cbz);
H2p = Dxx(po,ix,iz,cox,cax,cbx);
H2q = Dxx(qo,ix,iz,cox,cax,cbx);
/* p - main field */
pa[ix][iz] =
H1p * vsz[ix][iz] +
H2p * vpx[ix][iz] +
H1q * vpz[ix][iz] -
H1q * vsz[ix][iz];
/* q - auxiliary field */
qa[ix][iz] =
H2p * vpn[ix][iz] -
H2p * vsz[ix][iz] +
H1q * vpz[ix][iz] +
H2q * vsz[ix][iz];
}
}
} else {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz,H2p,H1q) \
shared(fdm,pa,po,qa,qo, \
cox,cax,cbx, \
coz,caz,cbz, \
vpn,vpx,vpz)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
H1q = Dzz(qo,ix,iz,coz,caz,cbz);
H2p = Dxx(po,ix,iz,cox,cax,cbx);
/* p - main field */
pa[ix][iz] =
H2p * vpx[ix][iz] +
H1q * vpz[ix][iz];
/* q - auxiliary field */
qa[ix][iz] =
H2p * vpn[ix][iz] +
H1q * vpz[ix][iz];
}
}
}
break;
case 'i':
default:
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,pa,po, \
cox,cax,cbx, \
coz,caz,cbz, \
vpz)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
pa[ix][iz] = ( Dxx(po,ix,iz,cox,cax,cbx) +
Dzz(po,ix,iz,coz,caz,cbz) ) * vpz[ix][iz];
}
}
break;
}
/* inject acceleration source */
if(expl) {
sf_floatread(ww, 1,Fwav);
; lint2d_inject1(pa,ww[0],cs);
if(atype[0] != 'i') lint2d_inject1(qa,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
; lint2d_inject(pa,ww,cs);
if(atype[0] != 'i') lint2d_inject(qa,ww,cs);
}
/* step forward in time */
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,pa,po,pm,pp,dt2)
#endif
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
pp[ix][iz] = 2*po[ix][iz]
- pm[ix][iz]
+ pa[ix][iz] * dt2;
}
}
/* circulate wavefield arrays */
pt=pm;
pm=po;
po=pp;
pp=pt;
if(atype[0] != 'i') {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,qa,qo,qm,qp,dt2)
#endif
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
qp[ix][iz] = 2*qo[ix][iz]
- qm[ix][iz]
+ qa[ix][iz] * dt2;
}
}
/* circulate wavefield arrays */
qt=qm;
qm=qo;
qo=qp;
qp=qt;
}
/* one-way abc apply */
if(dabc) {
abcone2d_apply(po,pm,NOP,abc,fdm);
sponge2d_apply(pm,spo,fdm);
sponge2d_apply(po,spo,fdm);
if(atype[0] != 'i') {
abcone2d_apply(qo,qm,NOP,abc,fdm);
sponge2d_apply(qm,spo,fdm);
sponge2d_apply(qo,spo,fdm);
}
}
/* compute stress */
if(sout && (atype[0] != 'i')) {
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,po,qo,sf)
#endif
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
sf[ix][iz] = po[ix][iz] + qo[ix][iz];
}
}
}
/* extract data at receivers */
if(sout && (atype[0] != 'i')) {lint2d_extract(sf,dd,cr);
} else { lint2d_extract(po,dd,cr);}
if(it%jdata==0) sf_floatwrite(dd,nr,Fdat);
/* extract wavefield in the "box" */
if(snap && it%jsnap==0) {
if(sout && (atype[0] != 'i')) {cut2d(sf,pc,fdm,acz,acx);
} else { cut2d(po,pc,fdm,acz,acx);}
sf_floatwrite(pc[0],sf_n(acz)*sf_n(acx),Fwfl);
}
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(*pm); free(pm);
free(*pp); free(pp);
free(*po); free(po);
free(*pa); free(pa);
free(*pc); free(pc);
free(*vp); free(vp);
free(*vpz); free(vpz);
if(atype[0] != 'i') {
free(*qm); free(qm);
free(*qp); free(qp);
free(*qo); free(qo);
free(*qa); free(qa);
free(*vpn); free(vpn);
free(*vpx); free(vpx);
if(uses){ free(*vsz); free(vsz); }
if(sout){ free(*sf); free(sf); }
}
if(atype[0] == 't') {
free(*sit); free(sit);
free(*cot); free(cot);
}
free(ww);
free(ss);
free(rr);
free(dd);
/*------------------------------------------------------------*/
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,expl,dabc;
int jsnap,ntsnap,jdata;
/* OMP parameters */
#ifdef _OPENMP
int ompnth;
#endif
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fvel=NULL; /* velocity */
sf_file Fdat=NULL; /* data */
sf_file Fwfl=NULL; /* wavefield */
/* cube axes */
sf_axis at,az,ax;
sf_axis as,ar;
int nt,nz,nx,ns,nr,nb;
int it,iz,ix;
float dt,dz,dx,idz,idx,dt2;
/* FDM structure */
fdm2d fdm=NULL;
abcone2d abc=NULL;
sponge spo=NULL;
/* I/O arrays */
float *ww=NULL; /* wavelet */
pt2d *ss=NULL; /* sources */
pt2d *rr=NULL; /* receivers */
float *dd=NULL; /* data */
float **tt=NULL;
float **vp=NULL; /* velocity */
float **vp2=NULL;
float **vv2=NULL;
float **vh2=NULL;
float **rm,**ro,**rp,**ra,**rt; /* main wavefield */
float **qm,**qo,**qp,**qa,**qt; /* auxiliary wavefield */
/* linear interpolation weights/indices */
lint2d cs,cr;
/* FD operator size */
float cox,coz,cax,cbx,caz,cbz;
/* wavefield cut params */
sf_axis acz=NULL,acx=NULL;
int nqz,nqx;
float oqz,oqx;
float dqz,dqx;
float **qc=NULL;
float H2q,H1r;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
/*------------------------------------------------------------*/
/* OMP parameters */
#ifdef _OPENMP
ompnth=omp_init();
#endif
/*------------------------------------------------------------*/
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
if(! sf_getbool("expl",&expl)) expl=false; /* "exploding reflector" */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* absorbing BC */
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* I/O files */
Fwav = sf_input ("in" ); /* wavelet */
Fvel = sf_input ("vel"); /* velocity */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
/*------------------------------------------------------------*/
/* axes */
at = sf_iaxa(Fwav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(Fvel,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(Fvel,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ns = sf_n(as);
nr = sf_n(ar);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* other execution parameters */
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil_init(verb,fsrf,az,ax,nb,1);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
dqz=sf_d(az);
dqx=sf_d(ax);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
/* check if the imaging window fits in the wavefield domain */
qc=sf_floatalloc2(sf_n(acz),sf_n(acx));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,at, 3);
}
if(expl) {
ww = sf_floatalloc( 1);
} else {
ww = sf_floatalloc(ns);
}
dd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt2d*) sf_alloc(ns,sizeof(*ss));
rr = (pt2d*) sf_alloc(nr,sizeof(*rr));
pt2dread1(Fsou,ss,ns,2); /* read (x,z) coordinates */
pt2dread1(Frec,rr,nr,2); /* read (x,z) coordinates */
cs = lint2d_make(ns,ss,fdm);
cr = lint2d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
idz = 1/dz;
idx = 1/dx;
cox= C0 * (idx*idx);
cax= CA * idx*idx;
cbx= CB * idx*idx;
coz= C0 * (idz*idz);
caz= CA * idz*idz;
cbz= CB * idz*idz;
/* precompute dt^2*/
dt2 = dt*dt;
/*------------------------------------------------------------*/
tt = sf_floatalloc2(nz,nx);
/*------------------------------------------------------------*/
/* input velocity */
vp =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vp2 =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vv2 =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vh2 =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
sf_floatread(tt[0],nz*nx,Fvel ); expand(tt,vv2,fdm); /* vertical v */
sf_floatread(tt[0],nz*nx,Fvel ); expand(tt,vp2,fdm); /* NMO v */
sf_floatread(tt[0],nz*nx,Fvel ); expand(tt,vh2,fdm); /* horizontal v */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vp2[ix][iz] = vp2[ix][iz] * vp2[ix][iz];
vv2[ix][iz] = vv2[ix][iz] * vv2[ix][iz];
vh2[ix][iz] = vh2[ix][iz] * vh2[ix][iz];
}
}
if(fsrf) { /* free surface */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
vp2[ix][iz]=0;
vv2[ix][iz]=0;
vh2[ix][iz]=0;
}
}
}
/*------------------------------------------------------------*/
free(*tt); free(tt);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
qm=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qp=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
qa=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
rm=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ro=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
rp=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ra=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
qm[ix][iz]=0;
qo[ix][iz]=0;
qp[ix][iz]=0;
qa[ix][iz]=0;
rm[ix][iz]=0;
ro[ix][iz]=0;
rp[ix][iz]=0;
ra[ix][iz]=0;
}
}
/*------------------------------------------------------------*/
if(dabc) {
/* one-way abc setup */
abc = abcone2d_make(NOP,dt,vp,fsrf,fdm);
/* sponge abc setup */
spo = sponge_make(fdm->nb);
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"\b\b\b\b\b%d",it);
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz,H2q,H1r) \
shared(fdm,ra,ro,qa,qo,cox,coz,cax,caz,cbx,cbz,idx,idz,vp2)
#endif
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
H2q = Dxx(qo,ix,iz,cox,cax,cbx);
H1r = Dzz(ro,ix,iz,coz,caz,cbz);
/* main field - q */
qa[ix][iz] = H2q * vh2[ix][iz] + H1r * vv2[ix][iz] ;
/* auxiliary field - r */
ra[ix][iz] = H2q * vp2[ix][iz] + H1r * vv2[ix][iz] ;
}
}
/* inject acceleration source */
if(expl) {
sf_floatread(ww, 1,Fwav);
lint2d_inject1(ra,ww[0],cs);
lint2d_inject1(qa,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint2d_inject(ra,ww,cs);
lint2d_inject(qa,ww,cs);
}
/* step forward in time */
#ifdef _OPENMP
#pragma omp parallel for \
schedule(dynamic,fdm->ompchunk) \
private(ix,iz) \
shared(fdm,ra,ro,rm,rp,qa,qo,qm,qp,dt2)
#endif
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
qp[ix][iz] = 2*qo[ix][iz]
- qm[ix][iz]
+ qa[ix][iz] * dt2;
rp[ix][iz] = 2*ro[ix][iz]
- rm[ix][iz]
+ ra[ix][iz] * dt2;
}
}
/* circulate wavefield arrays */
qt=qm;
qm=qo;
qo=qp;
qp=qt;
rt=rm;
rm=ro;
ro=rp;
rp=rt;
if(dabc) {
/* one-way abc apply */
abcone2d_apply(qo,qm,NOP,abc,fdm);
sponge2d_apply(qm,spo,fdm);
sponge2d_apply(qo,spo,fdm);
sponge2d_apply(qp,spo,fdm);
/* one-way abc apply */
abcone2d_apply(ro,rm,NOP,abc,fdm);
sponge2d_apply(rm,spo,fdm);
sponge2d_apply(ro,spo,fdm);
sponge2d_apply(rp,spo,fdm);
}
/* extract data */
lint2d_extract(qo,dd,cr);
if(snap && it%jsnap==0) {
cut2d(qo,qc,fdm,acz,acx);
sf_floatwrite(qc[0],sf_n(acz)*sf_n(acx),Fwfl);
}
if( it%jdata==0)
sf_floatwrite(dd,nr,Fdat);
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(*rm); free(rm);
free(*rp); free(rp);
free(*ro); free(ro);
free(*ra); free(ra);
free(*qm); free(qm);
free(*qp); free(qp);
free(*qo); free(qo);
free(*qa); free(qa);
free(*qc); free(qc);
free(*vp); free(vp);
free(*vp2); free(vp2);
free(*vh2); free(vh2);
free(*vv2); free(vv2);
free(ww);
free(ss);
free(rr);
free(dd);
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,dabc;
int jsnap,ntsnap;
int jdata;
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fvel=NULL; /* velocity */
sf_file Fref=NULL; /* reflectivity */
sf_file Fden=NULL; /* density */
sf_file Fdat=NULL; /* data (background) */
sf_file Fwfl=NULL; /* wavefield (background) */
sf_file Flid=NULL; /* data (scattered) */
sf_file Fliw=NULL; /* wavefield (scattered) */
/* I/O arrays */
float *ww=NULL; /* wavelet */
pt3d *ss=NULL; /* sources */
pt3d *rr=NULL; /* receivers */
float ***vpin=NULL; /* velocity */
float ***roin=NULL; /* density */
float ***rfin=NULL; /* reflectivity */
float ***vp=NULL; /* velocity in expanded domain */
float ***ro=NULL; /* density in expanded domain */
float ***iro=NULL; /* buoyancy in the expanded domain */
float ***rf=NULL; /* reflectivity in expanded domain */
float *bdd=NULL; /* data (background) */
float *sdd=NULL; /* data (scattered) */
float ***vt=NULL; /* temporary vp*vp * dt*dt */
float ***fsrfbck=NULL; /* ghost cells for free surface BC */
float ***fsrfsct=NULL; /* ghost cells for free surface BC */
float ***bum,***buo,***bup,***bua,***buat,***but; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
float ***sum,***suo,***sup,***sua,***suat,***sut; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
/* cube axes */
sf_axis at,a1,a2,a3,as,ar;
int nt,n1,n2,n3,ns,nr,nb;
int it,i1,i2,i3;
float dt,d1,d2,d3,id1,id2,id3,dt2;
/* linear interpolation weights/indices */
lint3d cs,cr;
fdm3d fdm;
abcone3d abc; /* abc */
sponge spo;
/* FD coefficients */
float c1x,c1y,c1z,
c2x,c2y,c2z,
c3x,c3y,c3z;
int ompchunk;
#ifdef _OPENMP
int ompnth,ompath;
#endif
sf_axis ac1=NULL,ac2=NULL,ac3=NULL;
int nqz,nqx,nqy;
float oqz,oqx,oqy;
float dqz,dqx,dqy;
float ***uc=NULL;
/* for benchmarking */
clock_t start_t, end_t;
float total_t;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
if(! sf_getint("ompchunk",&ompchunk)) ompchunk=1;
/* OpenMP data chunk size */
#ifdef _OPENMP
if(! sf_getint("ompnth", &ompnth)) ompnth=0;
/* OpenMP available threads */
#pragma omp parallel
ompath=omp_get_num_threads();
if(ompnth<1) ompnth=ompath;
omp_set_num_threads(ompnth);
sf_warning("using %d threads of a total of %d",ompnth,ompath);
#endif
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* Absorbing BC */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
Fwav = sf_input ("in" ); /* wavelet */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fvel = sf_input ("vel"); /* velocity */
Fden = sf_input ("den"); /* density */
Fref = sf_input ("ref"); /* reflectivity */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
Fliw = sf_output("liw"); /* wavefield (scattered) */
Flid = sf_output("lid"); /* data (scattered) */
/* axes */
at = sf_iaxa(Fwav,2);
sf_setlabel(at,"t");
if(verb) sf_raxa(at); /* time */
as = sf_iaxa(Fsou,2);
sf_setlabel(as,"s");
if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2);
sf_setlabel(ar,"r");
if(verb) sf_raxa(ar); /* receivers */
a1 = sf_iaxa(Fvel,1);
sf_setlabel(a1,"z");
if(verb) sf_raxa(a1); /* z */
a2 = sf_iaxa(Fvel,2);
sf_setlabel(a2,"x");
if(verb) sf_raxa(a2); /* x */
a3 = sf_iaxa(Fvel,3);
sf_setlabel(a3,"y");
if(verb) sf_raxa(a3); /* y */
nt = sf_n(at);
dt = sf_d(at);
ns = sf_n(as);
nr = sf_n(ar);
n1 = sf_n(a1);
d1 = sf_d(a1);
n2 = sf_n(a2);
d2 = sf_d(a2);
n3 = sf_n(a3);
d3 = sf_d(a3);
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil3d_init(verb,fsrf,a1,a2,a3,nb,ompchunk);
sf_setn(a1,fdm->nzpad);
sf_seto(a1,fdm->ozpad);
if(verb) sf_raxa(a1);
sf_setn(a2,fdm->nxpad);
sf_seto(a2,fdm->oxpad);
if(verb) sf_raxa(a2);
sf_setn(a3,fdm->nypad);
sf_seto(a3,fdm->oypad);
if(verb) sf_raxa(a3);
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_oaxa(Flid,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
sf_oaxa(Flid,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(a1);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(a2);
if(!sf_getint ("nqy",&nqy)) nqy=sf_n(a3);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(a1);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(a2);
if(!sf_getfloat("oqy",&oqy)) oqy=sf_o(a3);
dqz=sf_d(a1);
dqx=sf_d(a2);
dqy=sf_d(a3);
ac1 = sf_maxa(nqz,oqz,dqz);
ac2 = sf_maxa(nqx,oqx,dqx);
ac3 = sf_maxa(nqy,oqy,dqy);
/* check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc3(sf_n(ac1),sf_n(ac2),sf_n(ac3));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
/* sf_setn(at,nt/jsnap);
sf_setd(at,dt*jsnap); */
sf_oaxa(Fwfl,ac1,1);
sf_oaxa(Fwfl,ac2,2);
sf_oaxa(Fwfl,ac3,3);
sf_oaxa(Fwfl,at, 4);
sf_oaxa(Fliw,ac1,1);
sf_oaxa(Fliw,ac2,2);
sf_oaxa(Fliw,ac3,3);
sf_oaxa(Fliw,at, 4);
}
/* source wavelet array allocation */
ww = sf_floatalloc(ns);
/* data array allocation*/
bdd = sf_floatalloc(nr);
sdd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt3d*) sf_alloc(ns,sizeof(*ss));
rr = (pt3d*) sf_alloc(nr,sizeof(*rr));
pt3dread1(Fsou,ss,ns,3); /* read (x,y,z) coordinates */
pt3dread1(Frec,rr,nr,3); /* read (x,y,z) coordinates */
cs = lint3d_make(ns,ss,fdm);
cr = lint3d_make(nr,rr,fdm);
fdbell3d_init(1);
/*------------------------------------------------------------*/
/* setup FD coefficients */
dt2 = dt*dt;
id1 = 1/d1;
id2 = 1/d2;
id3 = 1/d3;
c1x = C1*id2;
c1y = C1*id3;
c1z = C1*id1;
c2x = C2*id2;
c2y = C2*id3;
c2z = C2*id1;
c3x = C3*id2;
c3y = C3*id3;
c3z = C3*id1;
/*------------------------------------------------------------*/
/* input density */
roin = sf_floatalloc3(n1, n2, n3);
ro = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
iro = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sf_floatread(roin[0][0],n1*n2*n3,Fden);
expand3d(roin,ro,fdm);
/* inverse density to avoid computation on the fly */
/*
there is 1 shell for i1=0 || i2=0 || i3=0 that is zero,
no big deal but better to fix it
*/
for (i3=1; i3<fdm->nypad; i3++) {
for (i2=1; i2<fdm->nxpad; i2++) {
for (i1=1; i1<fdm->nzpad; i1++) {
iro[i3][i2][i1] = 6./( 3*ro[i3 ][i2 ][i1 ] +
ro[i3 ][i2 ][i1-1] +
ro[i3 ][i2-1][i1 ] +
ro[i3-1][i2 ][i1 ] );
}
}
}
free(**roin);
free(*roin);
free(roin);
/*------------------------------------------------------------*/
/* input velocity */
vpin = sf_floatalloc3(n1, n2, n3);
vp = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
vt = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sf_floatread(vpin[0][0],n1*n2*n3,Fvel);
expand3d(vpin,vp,fdm);
free(**vpin);
free(*vpin);
free(vpin);
/*------------------------------------------------------------*/
/* input reflectivity */
rfin = sf_floatalloc3(n1, n2, n3);
rf = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sf_floatread(rfin[0][0],n1*n2*n3,Fref);
expand3d(rfin,rf,fdm);
free(**rfin);
free(*rfin);
free(rfin);
for (i3=0; i3<fdm->nypad; i3++) {
for (i2=0; i2<fdm->nxpad; i2++) {
for (i1=0; i1<fdm->nzpad; i1++) {
vt[i3][i2][i1] = vp[i3][i2][i1] * vp[i3][i2][i1] * dt2;
}
}
}
/* free surface */
if(fsrf) {
fsrfbck = sf_floatalloc3(4*NOP, fdm->nxpad, fdm->nypad);
fsrfsct = sf_floatalloc3(4*NOP, fdm->nxpad, fdm->nypad);
}
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
bum = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
buo = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
bup = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
bua = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
buat = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sum = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
suo = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sup = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
sua = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
suat = sf_floatalloc3(fdm->nzpad, fdm->nxpad, fdm->nypad);
for (i3=0; i3<fdm->nypad; i3++) {
for (i2=0; i2<fdm->nxpad; i2++) {
for (i1=0; i1<fdm->nzpad; i1++) {
bum[i3][i2][i1]=0;
buo[i3][i2][i1]=0;
bup[i3][i2][i1]=0;
bua[i3][i2][i1]=0;
sum[i3][i2][i1]=0;
suo[i3][i2][i1]=0;
sup[i3][i2][i1]=0;
sua[i3][i2][i1]=0;
}
}
}
/*------------------------------------------------------------*/
/* one-way abc setup */
abc = abcone3d_make(NOP,dt,vp,fsrf,fdm);
/* sponge abc setup */
spo = sponge_make(fdm->nb);
free(**vp);
free(*vp);
free(vp);
/*--------------------------------------------------------------*/
/* */
/* MAIN LOOP */
/* */
/*--------------------------------------------------------------*/
if(verb) fprintf(stderr,"\nFORWARD BORN ACOUSTIC VARIABLE-DENSITY WAVE EXTRAPOLATION \n");
/* extrapolation */
start_t = clock();
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"%d/%d \r",it,nt);
#ifdef _OPENMP
#pragma omp parallel private(i3,i2,i1)
#endif
{
if (fsrf) {
/* free surface */
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=0; i3<fdm->nypad; i3++) {
for (i2=0; i2<fdm->nxpad; i2++) {
for (i1=nb; i1<nb+2*NOP; i1++) {
fsrfbck[i3][i2][2*NOP+(i1-nb) ] = buo[i3][i2][i1];
fsrfbck[i3][i2][2*NOP-(i1-nb)-1] = -buo[i3][i2][i1];
fsrfsct[i3][i2][2*NOP+(i1-nb) ] = suo[i3][i2][i1];
fsrfsct[i3][i2][2*NOP-(i1-nb)-1] = -suo[i3][i2][i1];
}
}
}
}
// spatial derivatives z
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// gather
buat[i3][i2][i1] = iro[i3][i2][i1]*(
c3z*(buo[i3][i2][i1+2] - buo[i3][i2][i1-3]) +
c2z*(buo[i3][i2][i1+1] - buo[i3][i2][i1-2]) +
c1z*(buo[i3][i2][i1 ] - buo[i3][i2][i1-1])
);
suat[i3][i2][i1] = iro[i3][i2][i1]*(
c3z*(suo[i3][i2][i1+2] - suo[i3][i2][i1-3]) +
c2z*(suo[i3][i2][i1+1] - suo[i3][i2][i1-2]) +
c1z*(suo[i3][i2][i1 ] - suo[i3][i2][i1-1])
);
}
}
}
if (fsrf) {
// free surface
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=nb-NOP; i1<nb+NOP; i1++) {
buat[i3][i2][i1] = iro[i3][i2][i1]*(
c3z*(fsrfbck[i3][i2][2*NOP+(i1-nb)+2] - fsrfbck[i3][i2][2*NOP+(i1-nb)-3]) +
c2z*(fsrfbck[i3][i2][2*NOP+(i1-nb)+1] - fsrfbck[i3][i2][2*NOP+(i1-nb)-2]) +
c1z*(fsrfbck[i3][i2][2*NOP+(i1-nb) ] - fsrfbck[i3][i2][2*NOP+(i1-nb)-1])
);
suat[i3][i2][i1] = iro[i3][i2][i1]*(
c3z*(fsrfsct[i3][i2][2*NOP+(i1-nb)+2] - fsrfsct[i3][i2][2*NOP+(i1-nb)-3]) +
c2z*(fsrfsct[i3][i2][2*NOP+(i1-nb)+1] - fsrfsct[i3][i2][2*NOP+(i1-nb)-2]) +
c1z*(fsrfsct[i3][i2][2*NOP+(i1-nb) ] - fsrfsct[i3][i2][2*NOP+(i1-nb)-1])
);
}
}
}
}
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// scatter
bua[i3][i2][i1] = c1z*( buat[i3][i2][i1 ] -
buat[i3][i2][i1+1]) +
c2z*( buat[i3][i2][i1-1] -
buat[i3][i2][i1+2]) +
c3z*( buat[i3][i2][i1-2] -
buat[i3][i2][i1+3]);
sua[i3][i2][i1] = c1z*( suat[i3][i2][i1 ] -
suat[i3][i2][i1+1]) +
c2z*( suat[i3][i2][i1-1] -
suat[i3][i2][i1+2]) +
c3z*( suat[i3][i2][i1-2] -
suat[i3][i2][i1+3]);
}
}
}
// spatial derivatives x
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// gather
buat[i3][i2][i1] = iro[i3][i2][i1]*(
c3x*(buo[i3][i2+2][i1] - buo[i3][i2-3][i1]) +
c2x*(buo[i3][i2+1][i1] - buo[i3][i2-2][i1]) +
c1x*(buo[i3][i2 ][i1] - buo[i3][i2-1][i1])
);
suat[i3][i2][i1] = iro[i3][i2][i1]*(
c3x*(suo[i3][i2+2][i1] - suo[i3][i2-3][i1]) +
c2x*(suo[i3][i2+1][i1] - suo[i3][i2-2][i1]) +
c1x*(suo[i3][i2 ][i1] - suo[i3][i2-1][i1])
);
}
}
}
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// scatter
bua[i3][i2 ][i1] += c1x*(buat[i3][i2 ][i1] -
buat[i3][i2+1][i1]) +
c2x*(buat[i3][i2-1][i1] -
buat[i3][i2+2][i1]) +
c3x*(buat[i3][i2-2][i1] -
buat[i3][i2+3][i1]);
sua[i3][i2 ][i1] += c1x*(suat[i3][i2 ][i1] -
suat[i3][i2+1][i1]) +
c2x*(suat[i3][i2-1][i1] -
suat[i3][i2+2][i1]) +
c3x*(suat[i3][i2-2][i1] -
suat[i3][i2+3][i1]);
}
}
}
// spatial derivatives y
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// gather
buat[i3][i2][i1] = iro[i3][i2][i1]*(
c3x*(buo[i3+2][i2][i1] - buo[i3-3][i2][i1]) +
c2x*(buo[i3+1][i2][i1] - buo[i3-2][i2][i1]) +
c1x*(buo[i3 ][i2][i1] - buo[i3-1][i2][i1])
);
suat[i3][i2][i1] = iro[i3][i2][i1]*(
c3x*(suo[i3+2][i2][i1] - suo[i3-3][i2][i1]) +
c2x*(suo[i3+1][i2][i1] - suo[i3-2][i2][i1]) +
c1x*(suo[i3 ][i2][i1] - suo[i3-1][i2][i1])
);
}
}
}
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
// scatter
bua[i3][i2][i1] += c1y*(buat[i3 ][i2][i1] -
buat[i3+1][i2][i1]) +
c2y*( buat[i3-1][i2][i1] -
buat[i3+2][i2][i1]) +
c3y*( buat[i3-2][i2][i1] -
buat[i3+3][i2][i1]);
sua[i3][i2][i1] += c1y*(suat[i3 ][i2][i1] -
suat[i3+1][i2][i1]) +
c2y*( suat[i3-1][i2][i1] -
suat[i3+2][i2][i1]) +
c3y*( suat[i3-2][i2][i1] -
suat[i3+3][i2][i1]);
}
}
}
/* step forward in time */
#ifdef _OPENMP
#pragma omp for schedule(dynamic,fdm->ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
bup[i3][i2][i1] = 2*buo[i3][i2][i1]
- bum[i3][i2][i1]
- ro[i3][i2][i1]*vt[i3][i2][i1]*bua[i3][i2][i1];
sup[i3][i2][i1] = 2*suo[i3][i2][i1]
- sum[i3][i2][i1]
- ro[i3][i2][i1]*vt[i3][i2][i1]*sua[i3][i2][i1];
}
}
}
/* single scattering */
#ifdef _OPENMP
#pragma omp for schedule(dynamic,ompchunk)
#endif
for (i3=NOP; i3<fdm->nypad-NOP; i3++) {
for (i2=NOP; i2<fdm->nxpad-NOP; i2++) {
for (i1=NOP; i1<fdm->nzpad-NOP; i1++) {
sup[i3][i2][i1] -= 2*rf[i3][i2][i1]*ro[i3][i2][i1]*bua[i3][i2][i1]*dt2;
}
}
}
} /* end of the parallel section */
/* inject acceleration source */
sf_floatread(ww,ns,Fwav);
lint3d_bell(bup,ww,cs);
/* extract data */
lint3d_extract(bup,bdd,cr);
lint3d_extract(sup,sdd,cr);
if(snap && it%jsnap==0) {
cut3d(bup,uc,fdm,ac1,ac2,ac3);
sf_floatwrite(uc[0][0],sf_n(ac1)*sf_n(ac2)*sf_n(ac3),Fwfl);
cut3d(sup,uc,fdm,ac1,ac2,ac3);
sf_floatwrite(uc[0][0],sf_n(ac1)*sf_n(ac2)*sf_n(ac3),Fliw);
}
if( it%jdata==0) {
sf_floatwrite(bdd,nr,Fdat);
sf_floatwrite(sdd,nr,Flid);
}
/* one-way abc apply*/
if (dabc) {
abcone3d_apply(bup,buo,NOP,abc,fdm);
sponge3d_apply(bup, spo,fdm);
sponge3d_apply(buo, spo,fdm);
abcone3d_apply(sup,suo,NOP,abc,fdm);
sponge3d_apply(sup, spo,fdm);
sponge3d_apply(suo, spo,fdm);
}
/* circulate wavefield arrays */
but=bum;
bum=buo;
buo=bup;
bup=but;
sut=sum;
sum=suo;
suo=sup;
sup=sut;
} /* end time loop */
end_t = clock();
if(verb) fprintf(stderr,"\n");
if (verb) {
total_t = (float)(end_t - start_t) / CLOCKS_PER_SEC;
fprintf(stderr,"Total time taken by CPU: %g\n", total_t );
fprintf(stderr,"Exiting of the program...\n");
}
/*------------------------------------------------------------*/
/* deallocate arrays */
free(**bum);
free(*bum);
free(bum);
free(**buo);
free(*buo);
free(buo);
free(**bup);
free(*bup);
free(bup);
free(**bua);
free(*bua);
free(bua);
free(**buat);
free(*buat);
free(buat);
free(**sum);
free(*sum);
free(sum);
free(**suo);
free(*suo);
free(suo);
free(**sup);
free(*sup);
free(sup);
free(**sua);
free(*sua);
free(sua);
free(**suat);
free(*suat);
free(suat);
if(snap) {
free(**uc);
free(*uc);
free(uc);
}
if (fsrf) {
free(**fsrfbck);
free(*fsrfbck);
free(fsrfbck);
free(**fsrfsct);
free(*fsrfsct);
free(fsrfsct);
}
free(**vt);
free(*vt);
free(vt);
free(**ro);
free(*ro);
free(ro);
free(**iro);
free(*iro);
free(iro);
free(**rf);
free(*rf);
free(rf);
free(ww);
free(ss);
free(rr);
free(bdd);
free(sdd);
if (dabc) {
free(spo);
free(abc);
}
free(fdm);
/* ------------------------------------------------------------------------------------------ */
/* CLOSE FILES AND EXIT */
if (Fwav!=NULL) sf_fileclose(Fwav);
if (Fsou!=NULL) sf_fileclose(Fsou);
if (Frec!=NULL) sf_fileclose(Frec);
if (Fvel!=NULL) sf_fileclose(Fvel);
if (Fden!=NULL) sf_fileclose(Fden);
if (Fref!=NULL) sf_fileclose(Fref);
if (Fdat!=NULL) sf_fileclose(Fdat);
if (Fwfl!=NULL) sf_fileclose(Fwfl);
if (Fliw!=NULL) sf_fileclose(Fliw);
if (Flid!=NULL) sf_fileclose(Flid);
exit (0);
}
int main(int argc, char* argv[])
{
bool verb,fsrf,snap,expl,dabc,abcone,is2D,cfl;
bool ignore_interpolation = false; /* ignore interpolation for receivers - makes code faster, but only works when receivers are on grid points */
int jsnap,ntsnap,jdata;
float fmax, safety;
enum SourceType srctype;
/* I/O files */
sf_file Fwav=NULL; /* wavelet */
sf_file Fsou=NULL; /* sources */
sf_file Frec=NULL; /* receivers */
sf_file Fvel=NULL; /* velocity */
sf_file Fden=NULL; /* density */
sf_file Fdat=NULL; /* data */
sf_file Fwfl=NULL; /* wavefield */
/*set all y variables to be either zero or null to avoid compiler warnings
about being uninitialized */
/* cube axes */
sf_axis at,az,ax,ay=NULL;
sf_axis as,ar;
int nt,nz,nx,ny=0,ns,nr,nb;
int it,iz,ix,iy=0;
float dt,dz,dx,dy=0,idz,idx,idy=0;
/* I/O arrays */
float *ww=NULL; /* wavelet */
float *dd=NULL; /* data */
/* FD operator size */
float co,cax,cbx,cay,cby,caz,cbz;
/* wavefield cut params */
sf_axis acz=NULL,acx=NULL,acy=NULL;
int nqz,nqx,nqy;
float oqz,oqx,oqy;
float dqz,dqx,dqy;
/*------------------------------------------------------------*/
/* init RSF */
sf_init(argc,argv);
/*------------------------------------------------------------*/
/* OMP parameters */
if( !sf_getbool("ignint",&ignore_interpolation)) ignore_interpolation = false;
if(! sf_getbool("verb",&verb)) verb=false; /* verbosity flag */
if(! sf_getbool("snap",&snap)) snap=false; /* wavefield snapshots flag */
if(! sf_getbool("free",&fsrf)) fsrf=false; /* free surface flag */
if(! sf_getbool("expl",&expl)) expl=false; /* "exploding reflector" */
if(! sf_getbool("dabc",&dabc)) dabc=false; /* absorbing BC */
if(! sf_getbool("cfl",&cfl)) cfl=false; /* Use CFL check */
if(! sf_getbool("abcone",&abcone)) abcone=false; /* Use Zero-incident boundary condition*/
int ttype = 0;
if(! sf_getint("srctype",&ttype)) ttype = 0; /* source type, see comments */
if(ttype < 0 || ttype > 1) sf_error("Invalid source type specified");
srctype = ttype;
if (cfl) {
if(! sf_getfloat("fmax",&fmax)) { /* max frequency for cfl check */
sf_error("CFL: Must specify fmax for CFL check");
}
if(! sf_getfloat("safety",&safety) || safety < 0.0) safety= 0.8; /*safety factor for cfl check*/
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* I/O files */
Fwav = sf_input ("in" ); /* wavelet */
Fvel = sf_input ("vel"); /* velocity */
Fsou = sf_input ("sou"); /* sources */
Frec = sf_input ("rec"); /* receivers */
Fwfl = sf_output("wfl"); /* wavefield */
Fdat = sf_output("out"); /* data */
Fden = sf_input ("den"); /* density */
/* Determine dimensionality, if 2D then axis 3 has n size of 1 */
sf_axis test = sf_iaxa(Fvel,3);
if(sf_n(test) == 1) is2D = true;
else is2D = false;
/*------------------------------------------------------------*/
/* axes */
at = sf_iaxa(Fwav,2); sf_setlabel(at,"t"); if(verb) sf_raxa(at); /* time */
az = sf_iaxa(Fvel,1); sf_setlabel(az,"z"); if(verb) sf_raxa(az); /* depth */
ax = sf_iaxa(Fvel,2); sf_setlabel(ax,"x"); if(verb) sf_raxa(ax); /* space */
as = sf_iaxa(Fsou,2); sf_setlabel(as,"s"); if(verb) sf_raxa(as); /* sources */
ar = sf_iaxa(Frec,2); sf_setlabel(ar,"r"); if(verb) sf_raxa(ar); /* receivers */
nt = sf_n(at); dt = sf_d(at);
nz = sf_n(az); dz = sf_d(az);
nx = sf_n(ax); dx = sf_d(ax);
ns = sf_n(as);
nr = sf_n(ar);
if(!is2D){ /*If 3D*/
ay=sf_iaxa(Fvel,3); sf_setlabel(ay,"y"); if(verb) sf_raxa(ay); /*space*/
ny=sf_n(ay); dy=sf_d(ay);
}
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* other execution parameters */
if(! sf_getint("jdata",&jdata)) jdata=1;
if(snap) { /* save wavefield every *jsnap* time steps */
if(! sf_getint("jsnap",&jsnap)) jsnap=nt;
}
/*------------------------------------------------------------*/
if(is2D){
/* Begin 2d code */
/* FDM structure */
fdm2d fdm=NULL;
abcone2d abc=NULL;
sponge spo=NULL;
pt2d *ss=NULL; /* sources */
pt2d *rr=NULL; /* receivers */
float **tt=NULL;
float **ro=NULL; /* density */
float **roz=NULL; /* normalized 1st derivative of density on axis 1 */
float **rox=NULL; /* normalized 1st derivative of density on axis 2 */
float **vp=NULL; /* velocity */
float **vt=NULL; /* temporary vp*vp * dt*dt */
float **um,**uo,**up,**ua,**ut; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
/* linear interpolation weights/indices */
lint2d cs,cr;
float **uc=NULL;
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil_init(verb,fsrf,az,ax,nb,1);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);
dqz=sf_d(az);
dqx=sf_d(ax);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
/* check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc2(sf_n(acz),sf_n(acx));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,at, 3);
}
if(expl) {
ww = sf_floatalloc( 1);
} else {
ww = sf_floatalloc(ns);
}
dd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt2d*) sf_alloc(ns,sizeof(*ss));
rr = (pt2d*) sf_alloc(nr,sizeof(*rr));
pt2dread1(Fsou,ss,ns,2); /* read (x,z) coordinates */
pt2dread1(Frec,rr,nr,2); /* read (x,z) coordinates */
cs = lint2d_make(ns,ss,fdm);
cr = lint2d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
idz = 1/dz;
idx = 1/dx;
co = C0 * (idx*idx+idz*idz);
cax= CA * idx*idx;
cbx= CB * idx*idx;
caz= CA * idz*idz;
cbz= CB * idz*idz;
/*------------------------------------------------------------*/
tt = sf_floatalloc2(nz,nx);
ro =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
roz =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
rox =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vp =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
vt =sf_floatalloc2(fdm->nzpad,fdm->nxpad);
/* input density */
sf_floatread(tt[0],nz*nx,Fden); expand(tt,ro ,fdm);
/* normalized density derivatives */
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
roz[ix][iz] = DZ(ro,ix,iz,idz) / ro[ix][iz];
rox[ix][iz] = DX(ro,ix,iz,idx) / ro[ix][iz];
}
}
free(*ro); free(ro);
/* input velocity */
sf_floatread(tt[0],nz*nx,Fvel ); expand(tt,vp,fdm);
float vpmax = 0.0; float vpmin = 10000000000000000;
/* precompute vp^2 * dt^2 */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
vt[ix][iz] = vp[ix][iz] * vp[ix][iz] * dt*dt;
if (vp[ix][iz] < vpmin) vpmin = vp[ix][iz];
else if (vp[ix][iz] > vpmax) vpmax = vp[ix][iz];
}
}
if (cfl) cfl_acoustic(vpmin,vpmax,dx,-1.0f,dz,dt,fmax,safety,NUM_INTERVALS);
if(fsrf) { /* free surface */
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
vt[ix][iz]=0;
}
}
}
free(*tt); free(tt);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
um=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
uo=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
up=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
ua=sf_floatalloc2(fdm->nzpad,fdm->nxpad);
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
um[ix][iz]=0;
uo[ix][iz]=0;
up[ix][iz]=0;
ua[ix][iz]=0;
}
}
/*------------------------------------------------------------*/
if (abcone) abc = abcone2d_make(NOP,dt,vp,fsrf,fdm);
if(dabc) {
/* one-way abc setup */
/* sponge abc setup */
spo = sponge_make(fdm->nb);
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"%d/%d \r",it,nt);
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iz) \
shared(fdm,ua,uo,co,caz,cbz)
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
/* 4th order Laplacian operator */
ua[ix][iz] =
co * uo[ix ][iz ] +
caz*(uo[ix ][iz-1] + uo[ix ][iz+1]) +
cbz*(uo[ix ][iz-2] + uo[ix ][iz+2]) ;
/* density term */
/*ua[ix][iz] -= (
DZ(uo,ix,iz,idz) * roz[ix][iz] +
DX(uo,ix,iz,idx) * rox[ix][iz] );
*/
}
}
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iz) \
shared(fdm,ua,uo,co,cax,cbx)
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
ua[ix][iz] = ua[ix][iz] +
cax*(uo[ix-1][iz ] + uo[ix+1][iz ]) +
cbx*(uo[ix-2][iz ] + uo[ix+2][iz ]);
}
}
/* inject acceleration source */
if (srctype == ACCELERATION){
if(expl) {
sf_floatread(ww, 1,Fwav);
lint2d_inject1(ua,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint2d_inject(ua,ww,cs);
}
}
/* step forward in time */
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iz) \
shared(fdm,ua,uo,um,up,vt)
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
up[ix][iz] = 2*uo[ix][iz]
- um[ix][iz]
+ ua[ix][iz] * vt[ix][iz];
}
}
if(srctype == DISPLACEMENT){
if(expl) {
sf_floatread(ww, 1,Fwav);
lint2d_inject1(up,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint2d_inject(up,ww,cs);
}
}
/* circulate wavefield arrays */
ut=um;
um=uo;
uo=up;
up=ut;
if (abcone) abcone2d_apply(uo,um,NOP,abc,fdm);
if(dabc) {
/* one-way abc apply */
sponge2d_apply(um,spo,fdm);
sponge2d_apply(uo,spo,fdm);
sponge2d_apply(up,spo,fdm);
}
/* extract data */
if(ignore_interpolation){
cut2d_extract(uo,dd,cr);
} else {
lint2d_extract(uo,dd,cr);
}
if(snap && it%jsnap==0) {
cut2d(uo,uc,fdm,acz,acx);
sf_floatwrite(uc[0],sf_n(acz)*sf_n(acx),Fwfl);
}
if( it%jdata==0)
sf_floatwrite(dd,nr,Fdat);
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(*um); free(um);
free(*up); free(up);
free(*uo); free(uo);
free(*ua); free(ua);
if(snap) { free(*uc); free(uc); }
free(*rox); free(rox);
free(*roz); free(roz);
free(*vp); free(vp);
free(*vt); free(vt);
free(ww);
free(ss);
free(rr);
free(dd);
exit (0);
} else {
/* FDM structure */
fdm3d fdm=NULL;
abcone3d abc=NULL;
sponge spo=NULL;
/* I/O arrays */
pt3d *ss=NULL; /* sources */
pt3d *rr=NULL; /* receivers */
/* Non-universal arrays */
float***tt=NULL;
float***ro=NULL; /* density */
float***roz=NULL; /* normalized 1st derivative of density on axis 1 */
float***rox=NULL; /* normalized 1st derivative of density on axis 2 */
float***roy=NULL; /* normalized 1st derivative of density on axis 3 */
float***vp=NULL; /* velocity */
float***vt=NULL; /* temporary vp*vp * dt*dt */
float***um,***uo,***up,***ua,***ut; /* wavefield: um = U @ t-1; uo = U @ t; up = U @ t+1 */
/* linear interpolation weights/indices */
lint3d cs,cr;
/* Wavefield cut params that are not universal */
float ***uc=NULL;
/*------------------------------------------------------------*/
/* expand domain for FD operators and ABC */
if( !sf_getint("nb",&nb) || nb<NOP) nb=NOP;
fdm=fdutil3d_init(verb,fsrf,az,ax,ay,nb,1);
sf_setn(az,fdm->nzpad); sf_seto(az,fdm->ozpad); if(verb) sf_raxa(az);
sf_setn(ax,fdm->nxpad); sf_seto(ax,fdm->oxpad); if(verb) sf_raxa(ax);
sf_setn(ay,fdm->nypad); sf_seto(ay,fdm->oypad); if(verb) sf_raxa(ay);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* setup output data header */
sf_oaxa(Fdat,ar,1);
sf_setn(at,nt/jdata);
sf_setd(at,dt*jdata);
sf_oaxa(Fdat,at,2);
/* setup output wavefield header */
if(snap) {
if(!sf_getint ("nqz",&nqz)) nqz=sf_n(az);
if(!sf_getint ("nqx",&nqx)) nqx=sf_n(ax);
if(!sf_getint ("nqy",&nqy)) nqy=sf_n(ay);
if(!sf_getfloat("oqz",&oqz)) oqz=sf_o(az);
if(!sf_getfloat("oqx",&oqx)) oqx=sf_o(ax);
if(!sf_getfloat("oqy",&oqy)) oqy=sf_o(ay);
dqz=sf_d(az);
dqx=sf_d(ax);
dqy=sf_d(ay);
acz = sf_maxa(nqz,oqz,dqz); sf_raxa(acz);
acx = sf_maxa(nqx,oqx,dqx); sf_raxa(acx);
acy = sf_maxa(nqy,oqy,dqy); sf_raxa(acy);
/* check if the imaging window fits in the wavefield domain */
uc=sf_floatalloc3(sf_n(acz),sf_n(acx),sf_n(acy));
ntsnap=0;
for(it=0; it<nt; it++) {
if(it%jsnap==0) ntsnap++;
}
sf_setn(at, ntsnap);
sf_setd(at,dt*jsnap);
if(verb) sf_raxa(at);
sf_oaxa(Fwfl,acz,1);
sf_oaxa(Fwfl,acx,2);
sf_oaxa(Fwfl,acy,3);
sf_oaxa(Fwfl,at, 4);
}
if(expl) {
ww = sf_floatalloc( 1);
} else {
ww = sf_floatalloc(ns);
}
dd = sf_floatalloc(nr);
/*------------------------------------------------------------*/
/* setup source/receiver coordinates */
ss = (pt3d*) sf_alloc(ns,sizeof(*ss));
rr = (pt3d*) sf_alloc(nr,sizeof(*rr));
pt3dread1(Fsou,ss,ns,3); /* read (x,y,z) coordinates */
pt3dread1(Frec,rr,nr,3); /* read (x,y,z) coordinates */
cs = lint3d_make(ns,ss,fdm);
cr = lint3d_make(nr,rr,fdm);
/*------------------------------------------------------------*/
/* setup FD coefficients */
idz = 1/dz;
idx = 1/dx;
idy = 1/dy;
co = C0 * (idx*idx+idy*idy+idz*idz);
cax= CA * idx*idx;
cbx= CB * idx*idx;
cay= CA * idy*idy;
cby= CB * idy*idy;
caz= CA * idz*idz;
cbz= CB * idz*idz;
/*------------------------------------------------------------*/
tt = sf_floatalloc3(nz,nx,ny);
ro =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
roz =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
rox =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
roy =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
vp =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
vt =sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
/* input density */
sf_floatread(tt[0][0],nz*nx*ny,Fden); expand3d(tt,ro ,fdm);
/* normalized density derivatives */
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
roz[iy][ix][iz] = DZ3(ro,ix,iy,iz,idz) / ro[iy][ix][iz];
rox[iy][ix][iz] = DX3(ro,ix,iy,iz,idx) / ro[iy][ix][iz];
roy[iy][ix][iz] = DY3(ro,ix,iy,iz,idy) / ro[iy][ix][iz];
}
}
}
free(**ro); free(*ro); free(ro);
/* input velocity */
sf_floatread(tt[0][0],nz*nx*ny,Fvel ); expand3d(tt,vp,fdm);
/* precompute vp^2 * dt^2 */
float vpmin = 1000000000000; float vpmax = 0.0;
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
float vpt = vp[iy][ix][iz];
vt[iy][ix][iz] = vp[iy][ix][iz] * vp[iy][ix][iz] * dt*dt;
if (vpt > vpmax) vpmax = vpt;
else if (vpt < vpmin) vpmin = vpt;
}
}
}
if (cfl) cfl_acoustic(vpmin,vpmax,dx,dy,dz,dt,fmax,safety,NUM_INTERVALS);
if(fsrf) { /* free surface */
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nb; iz++) {
vt[iy][ix][iz]=0;
}
}
}
}
free(**tt); free(*tt); free(tt);
/*------------------------------------------------------------*/
/*------------------------------------------------------------*/
/* allocate wavefield arrays */
um=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
uo=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
up=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
ua=sf_floatalloc3(fdm->nzpad,fdm->nxpad,fdm->nypad);
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
um[iy][ix][iz]=0;
uo[iy][ix][iz]=0;
up[iy][ix][iz]=0;
ua[iy][ix][iz]=0;
}
}
}
/*------------------------------------------------------------*/
if (abcone) abc = abcone3d_make(NOP,dt,vp,fsrf,fdm);
if(dabc) {
/* one-way abc setup */
/* sponge abc setup */
spo = sponge_make(fdm->nb);
}
/*------------------------------------------------------------*/
/*
* MAIN LOOP
*/
/*------------------------------------------------------------*/
if(verb) fprintf(stderr,"\n");
for (it=0; it<nt; it++) {
if(verb) fprintf(stderr,"%d/%d \r",it,nt);
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iy,iz) \
shared(fdm,ua,uo,co,cax,cay,caz,cbx,cby,cbz,idx,idy,idz)
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
/* 4th order Laplacian operator */
ua[iy][ix][iz] =
co * uo[iy ][ix ][iz ] +
caz*(uo[iy ][ix ][iz-1] + uo[iy ][ix ][iz+1]) +
cbz*(uo[iy ][ix ][iz-2] + uo[iy ][ix ][iz+2]);
/* density term */
/*ua[iy][ix][iz] -= (
DZ3(uo,ix,iy,iz,idz) * roz[iy][ix][iz] +
DX3(uo,ix,iy,iz,idx) * rox[iy][ix][iz] +
DY3(uo,ix,iy,iz,idy) * roy[iy][ix][iz] );
*/
}
}
}
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iy,iz) \
shared(fdm,ua,uo,co,cax,cay,caz,cbx,cby,cbz,idx,idy,idz)
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
ua[iy][ix][iz] = ua[iy][ix][iz] +
cax*(uo[iy ][ix-1][iz ] + uo[iy ][ix+1][iz ]) +
cbx*(uo[iy ][ix-2][iz ] + uo[iy ][ix+2][iz ]) ;
}
}
}
#pragma omp parallel for \
schedule(dynamic) \
private(ix,iy,iz) \
shared(fdm,ua,uo,co,cax,cay,caz,cbx,cby,cbz,idx,idy,idz)
for (iy=NOP; iy<fdm->nypad-NOP; iy++) {
for (ix=NOP; ix<fdm->nxpad-NOP; ix++) {
for(iz=NOP; iz<fdm->nzpad-NOP; iz++) {
ua[iy][ix][iz] = ua[iy][ix][iz] +
cay*(uo[iy-1][ix ][iz ] + uo[iy+1][ix ][iz ]) +
cby*(uo[iy-2][ix ][iz ] + uo[iy+2][ix ][iz ]);
}
}
}
/* inject acceleration source */
if (srctype == ACCELERATION){
if(expl) {
sf_floatread(ww, 1,Fwav);
lint3d_inject1(ua,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint3d_inject(ua,ww,cs);
}
}
/* step forward in time */
#pragma omp parallel for \
schedule(static) \
private(ix,iy,iz) \
shared(fdm,ua,uo,um,up,vt)
for (iy=0; iy<fdm->nypad; iy++) {
for (ix=0; ix<fdm->nxpad; ix++) {
for(iz=0; iz<fdm->nzpad; iz++) {
up[iy][ix][iz] = 2*uo[iy][ix][iz]
- um[iy][ix][iz]
+ ua[iy][ix][iz] * vt[iy][ix][iz];
}
}
}
if (srctype == DISPLACEMENT) {
if(expl) {
sf_floatread(ww, 1,Fwav);
lint3d_inject1(up,ww[0],cs);
} else {
sf_floatread(ww,ns,Fwav);
lint3d_inject(up,ww,cs);
}
}
/* circulate wavefield arrays */
ut=um;
um=uo;
uo=up;
up=ut;
if(abcone) abcone3d_apply(uo,um,NOP,abc,fdm);
if(dabc) {
/* one-way abc apply */
sponge3d_apply(um,spo,fdm);
sponge3d_apply(uo,spo,fdm);
sponge3d_apply(up,spo,fdm);
}
/* extract data */
if (ignore_interpolation) {
cut3d_extract(uo,dd,cr);
} else {
lint3d_extract(uo,dd,cr);
}
if(snap && it%jsnap==0) {
cut3d(uo,uc,fdm,acz,acx,acy);
sf_floatwrite(uc[0][0],sf_n(acz)*sf_n(acx)*sf_n(acy),Fwfl);
}
if(it%jdata==0)
sf_floatwrite(dd,nr,Fdat);
}
if(verb) fprintf(stderr,"\n");
/*------------------------------------------------------------*/
/* deallocate arrays */
free(**um); free(*um); free(um);
free(**up); free(*up); free(up);
free(**uo); free(*uo); free(uo);
free(**ua); free(*ua); free(ua);
if (snap) { free(**uc); free(*uc); free(uc); }
free(**rox); free(*rox); free(rox);
free(**roy); free(*roy); free(roy);
free(**roz); free(*roz); free(roz);
free(**vp); free(*vp); free(vp);
free(**vt); free(*vt); free(vt);
free(ss);
free(rr);
free(dd);
free(ww);
exit (0);
}
}
