1 files changed, 104 insertions, 0 deletions
diff --git a/lib/world.c b/lib/world.c
new file mode 100644
index 0000000..954aa94
--- /dev/null
+++ b/lib/world.c
@@ -0,0 +1,104 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "types.h"
+#include "world.h"
+
+struct world {
+	struct entity entities[WORLD_MAX_ENTITIES];
+};
+
+struct world *
+dp_world_create()
+{
+	struct world *w;
+
+	if (!(w = malloc(sizeof(*w))))
+		return NULL;
+	memset(w, 0, sizeof(*w));
+
+	return w;
+}
+
+void
+dp_free_world(struct world *w)
+{
+	if (w)
+		free(w);
+}
+
+int
+dp_world_create_entity(struct world *w, int kind)
+{
+	int i;
+	struct entity *e;
+
+	if (!w)
+		return -1;
+	if (kind == ENTITY_NONE)
+		return -1;
+	
+	for (i = 0; i < WORLD_MAX_ENTITIES; i++) {
+		e = &w->entities[i];
+		if (e->kind != ENTITY_NONE)
+			continue;
+		e->kind = kind;
+		return i;
+	}
+
+	return -1;
+}
+
+struct entity *
+dp_world_find_entity(struct world *w, int entity_id)
+{
+	struct entity *e;
+
+	if (!w || entity_id < 0)
+		return NULL;
+	if (entity_id >= WORLD_MAX_ENTITIES)
+		return NULL;
+
+	e = &w->entities[entity_id];
+	
+	if (e->kind == ENTITY_NONE)
+		return NULL;
+
+	return e;
+}
+
+int
+dp_world_remove_entity(struct world *w, int entity_id)
+{
+	struct entity *e;
+
+	if (!(e = dp_world_find_entity(w, entity_id)))
+		return -1;
+
+	memset(e, 0, sizeof(*e));
+	e->kind = ENTITY_NONE;
+	return 0;
+}
+
+int
+dp_world_tick(struct world *w, double delta)
+{
+	int i;
+	struct entity *e;
+	struct entity_ball *ball;
+	
+	for (i = 0; i < WORLD_MAX_ENTITIES; i++)
+	{
+		e = &w->entities[i];
+		switch (e->kind) {
+		case ENTITY_BALL:
+			ball = &e->e.ball;
+			/*ball->pos = dp_vec2_new(500.0, 500.0);*/
+			ball->pos = dp_vec2_add(ball->pos, dp_vec2_mul(ball->vel, delta));
+			break;
+		default:
+			break;
+		}
+	}
+	return 0;
+}