93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
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#include "particle.h"
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#include "types.h"
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#include "util/tree.h"
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#include "util/vector.h"
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#include "util/assert.h"
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#include <stdio.h>
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System_Particle *particle_NewSystem(App *super) {
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System_Particle *sys = zero_malloc(sizeof(System_Particle));
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sys->super = super;
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sys->parts = tree_Create(sizeof(Particle));
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sys->deleted_ids = vector_Create(sizeof(uintptr_t));
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sys->maxID = 0;
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return sys;
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}
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void particle_DeleteSystem(System_Particle *sys) {
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tree_Destroy(sys->parts);
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vector_Destroy(sys->deleted_ids);
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free(sys);
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}
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static void _particle_AdvancePart(System_Particle *sys, Particle *p, Duration deltaTime) {
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p->size -= p->sizedec * duration_Seconds(deltaTime);
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if ((p->tolive.microseconds != 0 &&
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time_Since(p->addtime).microseconds > p->tolive.microseconds) ||
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p->size < EPS) { // vanished
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particle_Delete(sys, p->id);
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return;
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}
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// Move
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Vec2 delta = vec2_Scale(p->vec, duration_Seconds(deltaTime));
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p->pos = vec2_Add(p->pos, delta);
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// Move slower
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Vec2 delta_vec = vec2_Scale(p->vec, -p->vec_friction * duration_Seconds(deltaTime));
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p->vec = vec2_Add(p->vec, delta_vec);
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}
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void particle_Advance(System_Particle *sys, Duration deltaTime) {
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// Clear particles marked as deleted
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for (int i = 0; i < vector_Size(sys->deleted_ids); i++) {
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uintptr_t id = *(uintptr_t *)vector_At(sys->deleted_ids, i);
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tree_Node *n = tree_FindNode(sys->parts, id);
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if (n != NULL)
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tree_Delete(sys->parts, n);
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else
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fprintf(stderr, "[particle_Delete][WARN] Missing particle ID [%d]\n", id);
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}
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vector_Clear(sys->deleted_ids);
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for (tree_Node *i = tree_FirstNode(sys->parts);
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i != NULL;
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i = tree_Node_Next(i)) {
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Particle *p = (Particle *)i->data;
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_particle_AdvancePart(sys, p, deltaTime);
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}
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}
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void particle_Delete(System_Particle *sys, uintptr_t id) {
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vector_Push(sys->deleted_ids, &id);
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}
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void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill) {
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uintptr_t id = ++sys->maxID;
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Particle *p = tree_Insert(sys->parts, id, NULL);
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memset(p, 0, sizeof(Particle));
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p->id = id;
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p->addtime = time_Now();
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p->tolive = tolive;
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p->pos = pos;
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p->vec = vec;
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p->vec_friction = vec_friction;
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p->size = size;
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p->sizedec = sizedec;
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p->mode = fill;
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}
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void particle_Clear(System_Particle *sys) {
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vector_Clear(sys->deleted_ids);
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// Delete every first node
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int count = tree_Count(sys->parts);
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while (count--)
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tree_Delete(sys->parts, tree_FirstNode(sys->parts));
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ASSERT(tree_Count(sys->parts) == 0);
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}
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