1 files changed, 96 insertions, 0 deletions
diff --git a/debris.c b/debris.c
new file mode 100644
index 0000000..cf4a526
--- /dev/null
+++ b/debris.c
@@ -0,0 +1,96 @@
+#include "components.h"
+#include "map.h"
+#include "sprite.h"
+#include "standard.h"
+#include "world.h"
+
+Entity new_debris(
+	struct World* world,
+	int x,
+	int y,
+	int vx,
+	int vy,
+	Sprite_ID spr
+) {
+	Entity e;
+	CPosition* pos;
+	CDebris* debris;
+	CCollider* col;
+	CSprite* sprite;
+
+	e = new_entity(world);
+	add_components(
+		world,
+		e,
+		ctype_moveable |
+		ctype_collider |
+		ctype_debris |
+		ctype_position |
+		ctype_sprite
+	);
+
+	pos = &world->positions[e];
+	debris = &world->debris[e];
+	col = &world->colliders[e];
+	sprite = &world->sprites[e];
+
+	init_csprite(sprite, spr);
+	pos->x = x;
+	pos->y = y;
+	debris->vx = vx;
+	debris->vy = vy;
+	col->x = 0;
+	col->y = 0;
+	col->w = sprite->rect.w;
+	col->h = sprite->rect.h;
+
+	return e;
+}
+
+void debris_system(World* world) {
+	int i;
+	unsigned bits;
+	CPosition* pos;
+	CDebris* debris;
+	CSprite* sprite;
+	Bitmap map_bitmap;
+	const Bitmap* bmp;
+
+	get_map_bitmap(&world->map, &map_bitmap);
+
+	for (i = 0; i < world->entity_count; i++) {
+		bits = world->bitmask[i];
+		if (
+			(bits & ctype_debris) &&
+			(bits & ctype_position) &&
+			(bits & ctype_sprite)
+		) {
+			pos = &world->positions[i];
+			debris = &world->debris[i];
+			sprite = &world->sprites[i];
+
+			pos->x += debris->vx;
+			pos->y += debris->vy;
+			debris->vx = (debris->vx << fbits) / 600;
+			debris->vy = (debris->vy << fbits) / 600;
+
+			if (debris->vx == 0 && debris->vy == 0) {
+				/* Blit the motherfucker straight to the map
+				 * so that we don't have to keep updating it
+				 * when it's just sitting still. We can have
+				 * INFINITE debris now. */
+
+				bmp = get_bitmap(sprite->id);
+				blit(
+					&map_bitmap,
+					bmp,
+					pos->x >> fbits,
+					pos->y >> fbits,
+					&sprite->rect
+				);
+
+				destroy_entity(world, i);
+			}
+		}
+	}
+}