💾 Archived View for thrig.me › blog › 2024 › 02 › 29 › animate.c captured on 2024-03-21 at 15:41:33.
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// animate - a different take on handling entities than ECS but still an
// integer energy system
#include "animate.h"
struct anivec *
ani_init(size_t count)
{
struct anivec *av = malloc(sizeof(struct anivec));
if (!av) abort();
struct ani *el = calloc(count, sizeof(struct ani));
if (!el) abort();
av->count = count;
av->entry = el;
return av;
}
struct ani *
ani_create(struct anivec *av, int disp, int energy, ani_update func)
{
size_t max = av->count;
for (size_t i = 0; i < max; ++i) {
if (!av->entry[i].alive) {
struct ani *ep = &av->entry[i];
ep->alive = ep->newbie = 1;
ep->disp = disp;
ep->energy = energy;
ep->pos.xx = ep->pos.yy = 0;
ep->update = func;
return ep;
}
}
abort(); // whoops, no space left
}
void
ani_murder(struct ani *ep)
{
ep->alive = 0;
// they are new at being dead (has energy system ramifications)
ep->newbie = 1;
}
void
anivec_update(struct anivec *av, size_t turn)
{
size_t avcnt = av->count;
int min = INT_MAX;
for (size_t i = 0; i < avcnt; ++i) {
if (av->entry[i].alive && av->entry[i].energy < min)
min = av->entry[i].energy;
}
assert(min < INT_MAX); // no animates or everything is dead??
for (size_t i = 0; i < avcnt; ++i) {
if (av->entry[i].alive ^ av->entry[i].newbie) {
if (!(av->entry[i].energy -= min)) {
int neweng =
av->entry[i].update(&av->entry[i], turn);
assert(neweng > 0);
av->entry[i].energy = neweng;
}
}
}
for (size_t i = 0; i < avcnt; ++i)
av->entry[i].newbie = 0;
}