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#include "bullets.h"
#include "game.h"
Bullet createBullet(Entity entity, Vector3 direction, Vector3 offset, float damage) {
Bullet bullet = (Bullet){
.hit = false,
.ray = (Ray){
.position = Vector3Add(entity.position, offset),
.direction = direction,
},
.fromId = entity.id,
.fromFingerprint = entity.fingerprint,
.damage = damage
};
return bullet;
}
void initBullets(Bullets * bullets) {
bullets->bullets = NULL;
bullets->bulletsCount = 0;
}
void freeBullets(Bullets * bullets) {
if (bullets->bullets != NULL)
KF_FREE(bullets->bullets);
}
KfError addBullet(Bullets * bullets, Bullet bullet) {
// Not allocated yet.
if (bullets->bullets == NULL) {
bullets->bullets = (Bullet*)KF_CALLOC(1, sizeof(Bullet));
if (bullets->bullets == NULL) {
ALLOCATION_ERROR;
return KFERROR;
}
bullets->bulletsCount = 1;
bullets->bullets[0] = bullet;
return KFSUCCESS;
}
++bullets->bulletsCount;
// Reallocate.
bullets->bullets = (Bullet*)KF_REALLOCARRAY(
bullets->bullets,
bullets->bulletsCount,
sizeof(Bullet)
);
if (bullets->bullets == NULL) {
ALLOCATION_ERROR;
return KFERROR;
}
bullets->bullets[bullets->bulletsCount - 1] = bullet;
return KFSUCCESS;
}
KfError popBackBullets(Bullets * bullets) {
if (bullets->bullets == NULL)
return KFSUCCESS;
// At one.
if (bullets->bulletsCount == 1) {
KF_FREE(bullets->bullets);
bullets->bullets = NULL;
bullets->bulletsCount = 0;
return KFSUCCESS;
}
--bullets->bulletsCount;
// Reallocate.
bullets->bullets = (Bullet*)KF_REALLOCARRAY(
bullets->bullets,
bullets->bulletsCount,
sizeof(Bullet)
);
if (bullets->bullets == NULL) {
ALLOCATION_ERROR;
return KFERROR;
}
return KFSUCCESS;
}
void updateBullets(Game * game, Bullets * bullets) {
int i;
Bullet * last = NULL;
if (bullets->bullets == NULL)
return;
// Update each bullet.
for (i = 0; i < bullets->bulletsCount; ++i)
updateBullet(game, &bullets->bullets[i]);
// Remove end if hit or out of bounds.
last = &bullets->bullets[bullets->bulletsCount - 1];
if (last->hit)
popBackBullets(bullets);
else if (Vector3Length(last->ray.position) >= GAME_BOUNDS)
popBackBullets(bullets);
}
void updateBullet(Game * game, Bullet * bullet) {
int i, j;
RayCollision collision;
Ray ray;
Entity * currentEntity;
// Already hit.
if (bullet->hit)
return;
// Set direction.
ray.direction = bullet->ray.direction;
// Check collision.
for (i = 0; i < game->world.entitiesCount; ++i) {
currentEntity = &game->world.entities[i];
// This was the entity that shot it.
if (currentEntity->fingerprint == bullet->fromFingerprint)
continue;
else if (currentEntity->model == NULL) // Null model indeed.
continue;
// Set position relative to entity.
ray.position = Vector3Subtract(bullet->ray.position, currentEntity->position);
// Loop through meshes.
for (j = 0; j < currentEntity->model->meshCount; ++j) {
collision = GetRayCollisionMesh(
ray,
currentEntity->model->meshes[j],
currentEntity->model->transform
);
// Did hit.
if (!collision.hit)
continue;
currentEntity->health -= bullet->damage;
bullet->hit = true;
goto afterCollisionCheck;
}
}
afterCollisionCheck:
// Update position.
bullet->ray.position = Vector3Add(
bullet->ray.position,
bullet->ray.direction
);
// Debug ray (:
//DrawRay(bullet->ray, BLUE);
}
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