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/*------------------------------------------------------------------------
 * Copyright (C) 2011 For the list of authors, see file AUTHORS.
 *
 * This file is part of SOFI3D.
 * 
 * SOFI3D is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 2.0 of the License only.
 * 
 * SOFI3D is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with SOFI3D. See file COPYING and/or 
  * <http://www.gnu.org/licenses/gpl-2.0.html>.
--------------------------------------------------------------------------*/
/*------------------------------------------------------------------------
 *   Read elastic model properties (vp,vs,density) from files
 *   if L>0 damping model (qp and qs) are from file read, too
 *
 *  ----------------------------------------------------------------------*/
#include "fd.h"

void readmod(float  ***  rho, float ***  pi, float ***  u, 
		float ***  taus, float ***  taup, float *  eta){


	extern float DT, *FL, TAU, TS, FREF;
	extern int NX, NY, NZ, NXG, NYG, NZG, POS[4], L, MYID;
	extern int WRITE_MODELFILES;
	extern char  MFILE[STRING_SIZE];
	extern FILE *FP;


	/* local variables */
	float Rho=0.0, Vp=0.0, Vs=0.0, Qp=0.0, Qs=0.0;
	float muv=0.0, piv=0.0;
	float *pts=NULL, sumu=0.0, sumpi=0.0, ws=0.0;
	float *** pwavemod=NULL, *** swavemod=NULL;
	float *** qpmod=NULL, *** qsmod=NULL;
	int i, j, l, k, ii, jj, kk;
	FILE *fp_vs, *fp_vp, *fp_rho, *fp_qp=NULL ,*fp_qs=NULL;
	char filename[STRING_SIZE];

	/* choose data format: ASCII: format=2, BINARY: format=3*/
	const int format=3; 

	/*internal switch for writing all models to file (WRITE_MODELFILES=1)
	 * or just density (WRITE_MODELFILES=0)
	 * BE AWARE that the output of additional models besides density
	 * cause extra but temporal memory allocation of the size of the
	 * local subgrid times the number of models!!!!!!!!!! */


	if (WRITE_MODELFILES) {
		pwavemod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
		swavemod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
		qpmod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
		qsmod  =  f3tensor(0,NY+1,0,NX+1,0,NZ+1);
	}


	fprintf(FP,"\n...reading modell information from model-files...\n");

	fprintf(FP,"\t P-wave velocities:\n\t %s.vp\n\n",MFILE);
	sprintf(filename,"%s.vp",MFILE);
	fp_vp=fopen(filename,"r");
	if (fp_vp==NULL) err(" Could not open model file for P velocities ! ");

	fprintf(FP,"\t Shear wave velocities:\n\t %s.vs\n\n",MFILE);
	sprintf(filename,"%s.vs",MFILE);
	fp_vs=fopen(filename,"r");
	if (fp_vs==NULL) err(" Could not open model file for shear velocities ! ");

	fprintf(FP,"\t Density:\n\t %s.rho\n\n",MFILE);
	sprintf(filename,"%s.rho",MFILE);
	fp_rho=fopen(filename,"r");
	if (fp_rho==NULL) err(" Could not open model file for densities ! ");

	/*elastic simulation */
	if (L==0) {
		/* loop over global grid */
		for (k=1;k<=NZG;k++){
			for (i=1;i<=NXG;i++){
				for (j=1;j<=NYG;j++){
					Vp=readdsk(fp_vp, format);
					Vs=readdsk(fp_vs, format);
					Rho=readdsk(fp_rho , format);

					muv=Vs*Vs*Rho;
					piv=Vp*Vp*Rho;

					/* only the PE which belongs to the current global gridpoint
						is saving model parameters in his local arrays */
					if ((POS[1]==((i-1)/NX)) &&
							(POS[2]==((j-1)/NY)) &&
							(POS[3]==((k-1)/NZ))){
						ii=i-POS[1]*NX;
						jj=j-POS[2]*NY;
						kk=k-POS[3]*NZ;

						u[jj][ii][kk]=muv;
						rho[jj][ii][kk]=Rho;
						pi[jj][ii][kk]=piv;

						if (WRITE_MODELFILES) {
							pwavemod[jj][ii][kk]=Vp;
							swavemod[jj][ii][kk]=Vs;
						}
					}
				}
			}
		}
	}

	if (L){  /*viscoelastic simulation */


		/* if TAU is specified in input file, q-files will NOT be read-in separately
		thus a constant q-model will be assumed */
		if (TAU==0.0) {
			fprintf(FP,"\t Qp:\n\t %s.qp\n\n",MFILE);
			sprintf(filename,"%s.qp",MFILE);
			fp_qp=fopen(filename,"r");
			if (fp_qp==NULL) err(" Could not open model file for Qp-values ! ");

			fprintf(FP,"\t Qs:\n\t %s.qs\n\n",MFILE);
			sprintf(filename,"%s.qs",MFILE);
			fp_qs=fopen(filename,"r");
			if (fp_qs==NULL) err(" Could not open model file for Qs-values ! ");
		}

		/* vector for maxwellbodies */
		pts=vector(1,L);
		for (l=1;l<=L;l++) {
			pts[l]=1.0/(2.0*PI*FL[l]);
			eta[l]=DT/pts[l];
		}

		//previously : ws=2.0*PI*FL[1];
		/* in the viscoelastic case : reference frequency where no velocity dispersion occurs.
		 * if FREF is not given in input file, the largest center source frequency FC
		 * as specified in input file is used (not that the relation : FC=1/TS) is used here)*/

		if (FREF==0.0) ws=2.0*PI/TS;
		else ws=2.0*PI*FREF;


		//fprintf(FP,"MYID=%d \t\t ws=%5.5f \t pts=%5.5f \t FL=%5.5f \n ",MYID,ws,pts[l],FL[l]);

		/* loop over global grid */
		for (k=1;k<=NZG;k++){
			for (i=1;i<=NXG;i++){
				for (j=1;j<=NYG;j++){
					Vp=readdsk(fp_vp, format);
					Vs=readdsk(fp_vs, format);
					Rho=readdsk(fp_rho , format);

					/*calculation of taus and taup by read-in q-files*/
					if (TAU==0.0) {
						Qp=readdsk(fp_qp, format);
						Qs=readdsk(fp_qs, format);
					}
					else {
						/*constant q (damping) case:*/
						Qp=2.0/TAU;
						Qs=2.0/TAU;
					}

					sumu=0.0;
					sumpi=0.0;
					for (l=1;l<=L;l++){
						sumu=sumu+((ws*ws*pts[l]*pts[l]*(2/Qs))/(1.0+ws*ws*pts[l]*pts[l]));
						sumpi=sumpi+((ws*ws*pts[l]*pts[l]*(2/Qp))/(1.0+ws*ws*pts[l]*pts[l]));
					}

					muv=Vs*Vs*Rho/(1.0+sumu);
					piv=Vp*Vp*Rho/(1.0+sumpi);

					/* only the PE which belongs to the current global gridpoint
						is saving model parameters in his local arrays */
					if ((POS[1]==((i-1)/NX)) &&
							(POS[2]==((j-1)/NY)) &&
							(POS[3]==((k-1)/NZ))){
						ii=i-POS[1]*NX;
						jj=j-POS[2]*NY;
						kk=k-POS[3]*NZ;

						u[jj][ii][kk]=muv;
						rho[jj][ii][kk]=Rho;
						pi[jj][ii][kk]=piv;

						taus[jj][ii][kk]=2.0/Qs;
						taup[jj][ii][kk]=2.0/Qp;

						if (WRITE_MODELFILES) {
							pwavemod[jj][ii][kk]=Vp;
							swavemod[jj][ii][kk]=Vs;
							qsmod[jj][ii][kk]=2/taus[jj][ii][kk];
							qpmod[jj][ii][kk]=2/taup[jj][ii][kk];
						}
					}
				}
			}
		}
	}




	fclose(fp_vp);
	fclose(fp_vs);
	fclose(fp_rho);
	if ((L) && (TAU==0.0)) {
		fclose(fp_qp);
		fclose(fp_qs);
	}

	/* each PE writes his model to disk */

	if (WRITE_MODELFILES) {
		sprintf(filename,"%s.SOFI3D.pi",MFILE);
		writemod(filename,pi,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.u",MFILE);
		writemod(filename,u,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.vp",MFILE);
		writemod(filename,pwavemod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.vs",MFILE);
		writemod(filename,swavemod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);
	}

	sprintf(filename,"%s.SOFI3D.rho",MFILE);
	writemod(filename,rho,3);
	MPI_Barrier(MPI_COMM_WORLD);
	if (MYID==0) mergemod(filename,3);

	if ((L) && (WRITE_MODELFILES)) {
		sprintf(filename,"%s.SOFI3D.qp",MFILE);
		writemod(filename,qpmod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);

		sprintf(filename,"%s.SOFI3D.qs",MFILE);
		writemod(filename,qsmod,3);
		MPI_Barrier(MPI_COMM_WORLD);
		if (MYID==0) mergemod(filename,3);
	}


	free_vector(pts,1,L);
	if (WRITE_MODELFILES) {
		free_f3tensor(pwavemod,0,NY+1,0,NX+1,0,NZ+1);
		free_f3tensor(swavemod,0,NY+1,0,NX+1,0,NZ+1);
		if ((L) && (TAU==0.0)){
			free_f3tensor(qpmod,0,NY+1,0,NX+1,0,NZ+1);
			free_f3tensor(qsmod,0,NY+1,0,NX+1,0,NZ+1);
		}
	}

}