MD-Bench/lammps/atom.c
Rafael Ravedutti 1a708f2d3b Add PDB reading functions to lammps variant
Signed-off-by: Rafael Ravedutti <rafaelravedutti@gmail.com>
2022-02-24 15:17:51 +01:00

378 lines
14 KiB
C

/*
* =======================================================================================
*
* Authors: Jan Eitzinger (je), jan.eitzinger@fau.de
* Rafael Ravedutti (rr), rafaelravedutti@gmail.com
*
* Copyright (c) 2021 RRZE, University Erlangen-Nuremberg
*
* This file is part of MD-Bench.
*
* MD-Bench is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* MD-Bench 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 Lesser General Public License for more
* details.
*
* You should have received a copy of the GNU Lesser General Public License along
* with MD-Bench. If not, see <https://www.gnu.org/licenses/>.
* =======================================================================================
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <atom.h>
#include <allocate.h>
#include <util.h>
#define DELTA 20000
#ifndef MAXLINE
#define MAXLINE 4096
#endif
#ifndef MAX
#define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
void initAtom(Atom *atom)
{
atom->x = NULL; atom->y = NULL; atom->z = NULL;
atom->vx = NULL; atom->vy = NULL; atom->vz = NULL;
atom->fx = NULL; atom->fy = NULL; atom->fz = NULL;
atom->Natoms = 0;
atom->Nlocal = 0;
atom->Nghost = 0;
atom->Nmax = 0;
atom->type = NULL;
atom->ntypes = 0;
atom->epsilon = NULL;
atom->sigma6 = NULL;
atom->cutforcesq = NULL;
atom->cutneighsq = NULL;
}
void createAtom(Atom *atom, Parameter *param)
{
MD_FLOAT xlo = 0.0; MD_FLOAT xhi = param->xprd;
MD_FLOAT ylo = 0.0; MD_FLOAT yhi = param->yprd;
MD_FLOAT zlo = 0.0; MD_FLOAT zhi = param->zprd;
atom->Natoms = 4 * param->nx * param->ny * param->nz;
atom->Nlocal = 0;
atom->ntypes = param->ntypes;
atom->epsilon = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->sigma6 = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutforcesq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutneighsq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
for(int i = 0; i < atom->ntypes * atom->ntypes; i++) {
atom->epsilon[i] = param->epsilon;
atom->sigma6[i] = param->sigma6;
atom->cutneighsq[i] = param->cutneigh * param->cutneigh;
atom->cutforcesq[i] = param->cutforce * param->cutforce;
}
MD_FLOAT alat = pow((4.0 / param->rho), (1.0 / 3.0));
int ilo = (int) (xlo / (0.5 * alat) - 1);
int ihi = (int) (xhi / (0.5 * alat) + 1);
int jlo = (int) (ylo / (0.5 * alat) - 1);
int jhi = (int) (yhi / (0.5 * alat) + 1);
int klo = (int) (zlo / (0.5 * alat) - 1);
int khi = (int) (zhi / (0.5 * alat) + 1);
ilo = MAX(ilo, 0);
ihi = MIN(ihi, 2 * param->nx - 1);
jlo = MAX(jlo, 0);
jhi = MIN(jhi, 2 * param->ny - 1);
klo = MAX(klo, 0);
khi = MIN(khi, 2 * param->nz - 1);
MD_FLOAT xtmp, ytmp, ztmp, vxtmp, vytmp, vztmp;
int i, j, k, m, n;
int sx = 0; int sy = 0; int sz = 0;
int ox = 0; int oy = 0; int oz = 0;
int subboxdim = 8;
while(oz * subboxdim <= khi) {
k = oz * subboxdim + sz;
j = oy * subboxdim + sy;
i = ox * subboxdim + sx;
if(((i + j + k) % 2 == 0) &&
(i >= ilo) && (i <= ihi) &&
(j >= jlo) && (j <= jhi) &&
(k >= klo) && (k <= khi)) {
xtmp = 0.5 * alat * i;
ytmp = 0.5 * alat * j;
ztmp = 0.5 * alat * k;
if( xtmp >= xlo && xtmp < xhi &&
ytmp >= ylo && ytmp < yhi &&
ztmp >= zlo && ztmp < zhi ) {
n = k * (2 * param->ny) * (2 * param->nx) +
j * (2 * param->nx) +
i + 1;
for(m = 0; m < 5; m++) {
myrandom(&n);
}
vxtmp = myrandom(&n);
for(m = 0; m < 5; m++){
myrandom(&n);
}
vytmp = myrandom(&n);
for(m = 0; m < 5; m++) {
myrandom(&n);
}
vztmp = myrandom(&n);
if(atom->Nlocal == atom->Nmax) {
growAtom(atom);
}
atom_x(atom->Nlocal) = xtmp;
atom_y(atom->Nlocal) = ytmp;
atom_z(atom->Nlocal) = ztmp;
atom->vx[atom->Nlocal] = vxtmp;
atom->vy[atom->Nlocal] = vytmp;
atom->vz[atom->Nlocal] = vztmp;
atom->type[atom->Nlocal] = rand() % atom->ntypes;
atom->Nlocal++;
}
}
sx++;
if(sx == subboxdim) { sx = 0; sy++; }
if(sy == subboxdim) { sy = 0; sz++; }
if(sz == subboxdim) { sz = 0; ox++; }
if(ox * subboxdim > ihi) { ox = 0; oy++; }
if(oy * subboxdim > jhi) { oy = 0; oz++; }
}
}
int type_str2int(const char *type) {
if(strncmp(type, "Ar", 2) == 0) { return 0; } // Argon
fprintf(stderr, "Invalid atom type: %s\n", type);
exit(-1);
return -1;
}
int readAtom(Atom* atom, Parameter* param) {
int len = strlen(param->input_file);
if(strncmp(&param->input_file[len - 4], ".pdb", 4) == 0) { return readAtom_pdb(atom, param); }
if(strncmp(&param->input_file[len - 4], ".dmp", 4) == 0) { return readAtom_dmp(atom, param); }
fprintf(stderr, "Invalid input file extension: %s\nValid choices are: pdb, dmp\n", param->input_file);
exit(-1);
return -1;
}
int readAtom_pdb(Atom* atom, Parameter* param) {
FILE *fp = fopen(param->input_file, "r");
char line[MAXLINE];
int read_atoms = 0;
if(!fp) {
fprintf(stderr, "Could not open input file: %s\n", param->input_file);
exit(-1);
return -1;
}
while(!feof(fp)) {
fgets(line, MAXLINE, fp);
char *item = strtok(line, " ");
if(strncmp(item, "CRYST1", 6) == 0) {
param->xlo = 0.0;
param->xhi = atof(strtok(NULL, " "));
param->ylo = 0.0;
param->yhi = atof(strtok(NULL, " "));
param->zlo = 0.0;
param->zhi = atof(strtok(NULL, " "));
param->xprd = param->xhi - param->xlo;
param->yprd = param->yhi - param->ylo;
param->zprd = param->zhi - param->zlo;
// alpha, beta, gamma, sGroup, z
} else if(strncmp(item, "ATOM", 4) == 0) {
char *label;
int atom_id, comp_id;
MD_FLOAT occupancy, charge;
atom_id = atoi(strtok(NULL, " ")) - 1;
while(atom_id + 1 >= atom->Nmax) {
growAtom(atom);
}
atom->type[atom_id] = type_str2int(strtok(NULL, " "));
label = strtok(NULL, " ");
comp_id = atoi(strtok(NULL, " "));
atom_x(atom_id) = atof(strtok(NULL, " "));
atom_y(atom_id) = atof(strtok(NULL, " "));
atom_z(atom_id) = atof(strtok(NULL, " "));
atom->vx[atom_id] = 0.0;
atom->vy[atom_id] = 0.0;
atom->vz[atom_id] = 0.0;
occupancy = atof(strtok(NULL, " "));
charge = atof(strtok(NULL, " "));
atom->ntypes = MAX(atom->type[atom_id] + 1, atom->ntypes);
atom->Natoms++;
atom->Nlocal++;
read_atoms++;
} else if(strncmp(item, "HEADER", 6) == 0 ||
strncmp(item, "REMARK", 6) == 0 ||
strncmp(item, "MODEL", 5) == 0 ||
strncmp(item, "TER", 3) == 0 ||
strncmp(item, "ENDMDL", 6) == 0) {
// Do nothing
} else {
fprintf(stderr, "Invalid item: %s\n", item);
exit(-1);
return -1;
}
}
if(!read_atoms) {
fprintf(stderr, "Input error: No atoms read!\n");
exit(-1);
return -1;
}
atom->epsilon = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->sigma6 = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutforcesq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutneighsq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
for(int i = 0; i < atom->ntypes * atom->ntypes; i++) {
atom->epsilon[i] = param->epsilon;
atom->sigma6[i] = param->sigma6;
atom->cutneighsq[i] = param->cutneigh * param->cutneigh;
atom->cutforcesq[i] = param->cutforce * param->cutforce;
}
fprintf(stdout, "Read %d atoms from %s\n", read_atoms, param->input_file);
fclose(fp);
return read_atoms;
}
int readAtom_dmp(Atom* atom, Parameter* param)
{
FILE *fp = fopen(param->input_file, "r");
char line[MAXLINE];
int natoms = 0;
int read_atoms = 0;
int atom_id = -1;
int ts = -1;
if(!fp) {
fprintf(stderr, "Could not open input file: %s\n", param->input_file);
exit(-1);
return -1;
}
while(!feof(fp) && ts < 1 && !read_atoms) {
fgets(line, MAXLINE, fp);
if(strncmp(line, "ITEM: ", 6) == 0) {
char *item = &line[6];
if(strncmp(item, "TIMESTEP", 8) == 0) {
fgets(line, MAXLINE, fp);
ts = atoi(line);
} else if(strncmp(item, "NUMBER OF ATOMS", 15) == 0) {
fgets(line, MAXLINE, fp);
natoms = atoi(line);
atom->Natoms = natoms;
atom->Nlocal = natoms;
while(atom->Nlocal >= atom->Nmax) {
growAtom(atom);
}
} else if(strncmp(item, "BOX BOUNDS pp pp pp", 19) == 0) {
fgets(line, MAXLINE, fp);
param->xlo = atof(strtok(line, " "));
param->xhi = atof(strtok(NULL, " "));
param->xprd = param->xhi - param->xlo;
fgets(line, MAXLINE, fp);
param->ylo = atof(strtok(line, " "));
param->yhi = atof(strtok(NULL, " "));
param->yprd = param->yhi - param->ylo;
fgets(line, MAXLINE, fp);
param->zlo = atof(strtok(line, " "));
param->zhi = atof(strtok(NULL, " "));
param->zprd = param->zhi - param->zlo;
} else if(strncmp(item, "ATOMS id type x y z vx vy vz", 28) == 0) {
for(int i = 0; i < natoms; i++) {
fgets(line, MAXLINE, fp);
atom_id = atoi(strtok(line, " ")) - 1;
atom->type[atom_id] = atoi(strtok(NULL, " "));
atom_x(atom_id) = atof(strtok(NULL, " "));
atom_y(atom_id) = atof(strtok(NULL, " "));
atom_z(atom_id) = atof(strtok(NULL, " "));
atom->vx[atom_id] = atof(strtok(NULL, " "));
atom->vy[atom_id] = atof(strtok(NULL, " "));
atom->vz[atom_id] = atof(strtok(NULL, " "));
atom->ntypes = MAX(atom->type[atom_id], atom->ntypes);
read_atoms++;
}
} else {
fprintf(stderr, "Invalid item: %s\n", item);
exit(-1);
return -1;
}
} else {
fprintf(stderr, "Invalid input from file, expected item reference but got:\n%s\n", line);
exit(-1);
return -1;
}
}
if(ts < 0 || !natoms || !read_atoms) {
fprintf(stderr, "Input error: atom data was not read!\n");
exit(-1);
return -1;
}
atom->epsilon = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->sigma6 = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutforcesq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
atom->cutneighsq = allocate(ALIGNMENT, atom->ntypes * atom->ntypes * sizeof(MD_FLOAT));
for(int i = 0; i < atom->ntypes * atom->ntypes; i++) {
atom->epsilon[i] = param->epsilon;
atom->sigma6[i] = param->sigma6;
atom->cutneighsq[i] = param->cutneigh * param->cutneigh;
atom->cutforcesq[i] = param->cutforce * param->cutforce;
}
fprintf(stdout, "Read %d atoms from %s\n", natoms, param->input_file);
return natoms;
}
void growAtom(Atom *atom)
{
int nold = atom->Nmax;
atom->Nmax += DELTA;
#ifdef AOS
atom->x = (MD_FLOAT*) reallocate(atom->x, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT) * 3, nold * sizeof(MD_FLOAT) * 3);
#else
atom->x = (MD_FLOAT*) reallocate(atom->x, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->y = (MD_FLOAT*) reallocate(atom->y, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->z = (MD_FLOAT*) reallocate(atom->z, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
#endif
atom->vx = (MD_FLOAT*) reallocate(atom->vx, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->vy = (MD_FLOAT*) reallocate(atom->vy, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->vz = (MD_FLOAT*) reallocate(atom->vz, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->fx = (MD_FLOAT*) reallocate(atom->fx, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->fy = (MD_FLOAT*) reallocate(atom->fy, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->fz = (MD_FLOAT*) reallocate(atom->fz, ALIGNMENT, atom->Nmax * sizeof(MD_FLOAT), nold * sizeof(MD_FLOAT));
atom->type = (int *) reallocate(atom->type, ALIGNMENT, atom->Nmax * sizeof(int), nold * sizeof(int));
}