49 lines
974 B
C
49 lines
974 B
C
#include "particle.h"
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#include "stb_ds.h"
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struct emitter make_emitter() {
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struct emitter e = {0};
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return e;
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}
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struct emitter set_emitter(struct emitter e) {
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arrsetlen(e.particles, e.max);
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e.first = &e.particles[0];
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for (int i = 0; i < arrlen(e.particles) - 1; i++) {
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e.particles[i].next = &e.particles[i + 1];
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}
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return e;
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}
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void free_emitter(struct emitter e) {
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arrfree(e.particles);
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}
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void start_emitter(struct emitter e) {
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}
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void pause_emitter(struct emitter e) {
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}
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void stop_emitter(struct emitter e) {
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}
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void emitter_step(struct emitter e, double dt) {
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for (int i = 0; i < arrlen(e.particles); i++) {
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if (e.particles[i].life <= 0)
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continue;
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e.particles[i].pos = cpvadd(e.particles[i].pos, cpvmult(e.particles[i].v, dt));
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e.particles[i].angle += e.particles[i].av * dt;
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e.particles[i].life -= dt;
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if (e.particles[i].life <= 0) {
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e.particles[i].next = e.first;
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e.first = &e.particles[i];
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}
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}
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}
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