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#ifndef _PHYSICS_H
#define _PHYSICS_H
#include "common.h"
#include "itc.h"
typedef struct {
size_t width, height, depth;
size_t zstr, ystr, xstr, size; // strides in no. of points (not bytes)
size_t zstr1, ystr1, xstr1, size1; // same as above but for associated
// scalar fields
float spacing; // in meters
} phy_field_info;
typedef struct {
float *E;
float *H;
} phy_field_em;
enum {
PHY_CMD_QUIT,
PHY_CMD_PAUSE,
PHY_CMD_RESUME,
PHY_CMD_STEP,
PHY_CMD_RESET
};
typedef struct {
phy_field_info field_info;
phy_field_em fields[3];
float *field_eps, *field_mu; //permittivity and permeability
float time, time_delta;
// UI stuff
bool running;
itc_chan ctl;
SDL_mutex *rotate_lock;
int64_t frame_index; // to avoid re-drawing the same fields
int64_t step_real_time;
} phy_sim;
void phy_sim_destroy(phy_sim *sim);
int phy_sim_create(phy_sim *sim);
void phy_sim_compute_const_fields(phy_sim *sim);
void phy_sim_step(phy_sim *sim);
int phy_thread(phy_sim *sim);
#endif // _PHYSICS_H
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