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#include "world.h"
#include "game.h"
void initWorld(World * world) {
world->entities = NULL;
world->entitiesCount = 0;
world->lookUp = NULL;
world->lookUpSize = 0;
world->vacantIds = NULL;
world->vacantIdsCount = 0;
// Set current fingerprint.
SetRandomSeed(time(NULL));
world->currentFingerprint = GetRandomValue(
FINGERPRINT_START_RANGE_MIN,
FINGERPRINT_START_RANGE_MAX
);
}
void freeWorld(World * world) {
int i;
if (world->entities == NULL)
return;
// Close entities.
for (i = 0; i < world->entitiesCount; ++i)
closeEntity(&world->entities[i]);
KF_FREE(world->entities);
KF_FREE(world->lookUp);
if (world->vacantIds != NULL)
KF_FREE(world->vacantIds);
}
// Not for direct use.
KfError pushVacantId(World * world, EntityId id) {
++world->vacantIdsCount;
// Allocate.
if (world->vacantIds == NULL)
world->vacantIds = (EntityId*)KF_CALLOC(1, sizeof(EntityId));
else
world->vacantIds = (EntityId*)KF_REALLOCARRAY(
world->vacantIds,
world->vacantIdsCount,
sizeof(EntityId)
);
if (world->vacantIds == NULL) {
ALLOCATION_ERROR;
return KFERROR;
}
world->vacantIds[world->vacantIdsCount - 1] = id;
return KFSUCCESS;
}
// Not for direct use.
EntityId popVacantId(World * world) {
EntityId id;
// Already empty.
if (world->vacantIds == NULL)
return ENTITY_ID_NONE;
id = world->vacantIds[world->vacantIdsCount - 1];
// Decrease count.
--world->vacantIdsCount;
// Free or recallocate.
if (world->vacantIdsCount == 0) {
KF_FREE(world->vacantIds);
world->vacantIds = NULL;
} else {
world->vacantIds = (EntityId*)KF_REALLOCARRAY(
world->vacantIds,
world->vacantIdsCount,
sizeof(EntityId)
);
}
return id;
}
Entity * getEntityFromWorld(World world, EntityId id) {
if (world.entities == NULL || id < 0 || id >= world.lookUpSize)
return NULL;
int pos = world.lookUp[id];
if (pos == ENTITY_ID_NONE)
return NULL;
return &world.entities[pos];
}
EntityId addEntityToWorld(World * world, Entity entity) {
EntityId id;
EntityId poppedId;
Entity entityCopy = entity;
// Set fingerprint.
entityCopy.fingerprint = world->currentFingerprint;
++world->currentFingerprint;
// Not allocated.
if (world->entities == NULL) {
// Allocate.
world->entities = (Entity*)KF_CALLOC(1, sizeof(Entity));
world->lookUp = (EntityId*)KF_CALLOC(1, sizeof(EntityId));
world->entitiesCount = 1;
world->lookUpSize = 1;
if (world->entities == NULL || world->lookUp == NULL) {
ALLOCATION_ERROR;
return ENTITY_ID_NONE;
}
// Set entity and id.
world->entities[0] = entityCopy;
world->entities[0].id = 0;
world->lookUp[0] = 0;
return 0;
}
++world->entitiesCount;
// Resize.
world->entities = (Entity*)KF_REALLOCARRAY(
world->entities,
world->entitiesCount,
sizeof(Entity)
);
if (world->entities == NULL) {
ALLOCATION_ERROR;
return ENTITY_ID_NONE;
}
// Set entity.
world->entities[world->entitiesCount - 1] = entityCopy;
// Set look up.
poppedId = popVacantId(world);
// Got popped id.
if (poppedId != ENTITY_ID_NONE) {
world->lookUp[poppedId] = world->entitiesCount - 1;
world->entities[world->entitiesCount - 1].id = poppedId;
return poppedId;
}
++world->lookUpSize;
world->lookUp = (EntityId*)KF_REALLOCARRAY(
world->lookUp,
world->lookUpSize,
sizeof(EntityId)
);
if (world->lookUp == NULL) {
ALLOCATION_ERROR;
return ENTITY_ID_NONE;
}
// Set id.
id = world->lookUpSize - 1;
world->entities[world->entitiesCount - 1].id = id;
world->lookUp[id] = world->entitiesCount - 1;
return id;
}
KfError removeEntityFromWorld(World * world, EntityId id) {
int i;
int pos;
if (world->entitiesCount == 1)
return KFERROR;
// Get position in list.
pos = world->lookUp[id];
if (pos == ENTITY_ID_NONE)
return KFSUCCESS;
// Close entity.
closeEntity(&world->entities[pos]);
// Push id.
if (pushVacantId(world, id) != KFSUCCESS)
return KFERROR;
// Move back entities.
for (i = pos; i < world->entitiesCount - 1; ++i)
world->entities[i] = world->entities[i + 1];
// Update lookup.
for (i = id + 1; i < world->lookUpSize; ++i)
--world->lookUp[i];
world->lookUp[id] = ENTITY_ID_NONE;
// Resize entities.
--world->entitiesCount;
world->entities = (Entity*)KF_REALLOCARRAY(
world->entities,
world->entitiesCount,
sizeof(Entity)
);
if (world->entities == NULL) {
ALLOCATION_ERROR;
return KFERROR;
}
return KFSUCCESS;
}
void updateWorld(World * world, Game * game) {
int i;
Entity * entity;
for (i = 0; i < world->entitiesCount; ++i) {
entity = &world->entities[i];
// Call update callback.
if (entity->updateCb != NULL)
entity->updateCb(game, entity, i);
}
}
void drawWorld(World * world, Game * game) {
int i;
Entity * entity;
for (i = 0; i < world->entitiesCount; ++i) {
entity = &world->entities[i];
// Call draw callback.
if (entity->drawCb != NULL)
entity->drawCb(game, entity, i);
}
}
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