Add shooting.

1 files changed, 80 insertions, 0 deletions

diff --git a/bullet.c b/bullet.c
new file mode 100644
index 0000000..f2e1a2e
--- /dev/null
+++ b/bullet.c
@@ -0,0 +1,80 @@
+#include "bullet.h"
+#include "components.h"
+#include "error.h"
+#include "platform.h"
+#include "sprite.h"
+#include "world.h"
+
+Entity new_player_bullet(
+	World* world,
+	int x,
+	int y,
+	int vx,
+	int vy,
+	int life
+) {
+	Entity e;
+	CBullet* bullet;
+	CPosition* pos;
+	CSprite* sprite;
+	Sprite_ID sprid;
+
+	e = new_entity(world);
+
+	add_components(
+		world,
+		e,
+		ctype_sprite        |
+		ctype_position      |
+		ctype_bullet        |
+		ctype_player_bullet
+	);
+	pos = &world->positions[e];
+	sprite = &world->sprites[e];
+	bullet = &world->bullets[e];
+	pos->x = x;
+	pos->y = y;
+
+	bullet->vx = vx;
+	bullet->vy = vy;
+	bullet->life = life;
+
+	if (vx < 0) {
+		sprid = sprite_player_bullet_left;
+	} else if (vx > 0) {
+		sprid = sprite_player_bullet_right;
+	} else if (vy < 0) {
+		sprid = sprite_player_bullet_up;
+	} else if (vy > 0) {
+		sprid = sprite_player_bullet_down;
+	}
+#ifdef DEBUG
+	else {
+		platform_log("Player bullets must have velocity\n");
+		platform_abort(error_gameplay_error);
+	}
+#endif
+
+	init_csprite(sprite, sprid);
+
+	return e;
+}
+
+void bullet_system(World* world) {
+	int i;
+	unsigned bits;
+	CPosition* pos;
+	CBullet* bullet;
+
+	for (i = 0; i < world->entity_count; i++) {
+		bits = world->bitmask[i];
+		if ((bits & ctype_position) && (bits & ctype_bullet)) {
+			pos    = &world->positions[i];
+			bullet = &world->bullets[i];
+
+			pos->x += bullet->vx;
+			pos->y += bullet->vy;
+			bullet->life--;
+		}
+	}
+}