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main-wasm.cpp
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main-wasm.cpp
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#include <iostream>
#include <emscripten.h>
#include <memory>
#include <vector>
#include "body.h"
#include "quad.h"
#include "bhtree.h"
std::vector<std::shared_ptr<Body>> bodies;
double R;
void _init(int n_bodies, double *x_pos, double *y_pos, double *x_vel, double *y_vel, double *mass, double radius) {
bodies.clear();
R = radius;
for (int i = 0; i < n_bodies; i++) {
bodies.push_back(std::make_shared<Body>(x_pos[i], y_pos[i], x_vel[i], y_vel[i], mass[i]));
}
}
void _step(double dt) {
std::shared_ptr<Quad> quad = std::make_shared<Quad>(0, 0, R);
std::shared_ptr<BHTree> tree = std::make_shared<BHTree>(quad);
for (const auto &body : bodies) {
if (body->in(quad)) {
tree->insert(body);
}
}
for (const auto &body : bodies) {
body->resetForce();
tree->updateForce(body);
body->update(dt);
}
}
double *_getXPos() {
auto xPos = (double *) malloc(bodies.size() * sizeof(double));
for (int i = 0; i < bodies.size(); i++) {
xPos[i] = bodies[i]->x;
}
return xPos;
}
double *_getYPos() {
auto yPos = (double *) malloc(bodies.size() * sizeof(double));
for (int i = 0; i < bodies.size(); i++) {
yPos[i] = bodies[i]->y;
}
return yPos;
}
extern "C" {
void init(int n_bodies, double *x_pos, double *y_pos, double *x_vel, double *y_vel, double *mass, double radius) {
_init(n_bodies, x_pos, y_pos, x_vel, y_vel, mass, radius);
}
void step(double dt) {
_step(dt);
}
double *getXPos() {
return _getXPos();
}
double *getYPos() {
return _getYPos();
}
}
int main() {
emscripten_exit_with_live_runtime();
return 0;
}