initial commit.

1 files changed, 96 insertions, 0 deletions

diff --git a/ent.h b/ent.h
new file mode 100644
index 0000000..48ecbec
--- /dev/null
+++ b/ent.h
@@ -0,0 +1,96 @@
+#ifndef ENT_H
+#define ENT_H
+
+#include "common.h"
+#include "physics.h"
+
+#define ENTITY_INVALID_IDX UINT32_MAX
+
+// typedef enum {
+// 	ENT_COMP_TRANSFORM,
+// 	ENT_COMP_MODEL,
+// 	ENT_COMP_PHYSICS,
+// 	ENT_COMP_EDITOR,
+// 	ENT_COMP_CNT,
+// } EntityComponentType;
+
+typedef struct {
+	u64 parent;
+	u64 first_child;
+	u64 prev, next; // siblings
+	/* parent-local */
+	Vec3 pos, scale;
+	Quaternion rot;
+} TransformCmp;
+
+typedef struct {
+	char *key;
+	Model *mdl;
+	bool has, draw;
+} ModelCmp;
+
+typedef struct {
+	PhysicsBody *bodies;
+	PhysicsJoint *joints;
+	u32 body_cnt, joint_cnt;
+
+	struct {
+		PhysicsBodyRuntime *bodies;
+		b3JointId *joints;
+	} runtime;
+
+	bool has, debug_draw;
+} PhysicsCmp;
+
+typedef struct {
+	bool selected; 
+} EditorCmp; // transient data for non transient entities ^___^
+
+typedef struct {
+	TransformCmp tr;
+	ModelCmp mdl;
+	PhysicsCmp phys;
+	EditorCmp ed;
+
+	u64 pid; // persistent serialized id, not runtime entity id
+	char *name;
+} Entity;
+
+void		entity_system_init(void);
+void		entity_system_exit(void);
+void		entity_system_clear(void);
+void		entity_system_update(void);
+void		entity_system_draw_3d(void);
+void		entity_system_set_next_pid(u64);
+
+/* clears all entities of their selected flag */
+void		entities_clear_selected(void);
+
+u64		entity_create(bool transient); // transient means no pid
+u64		entity_restore(u64 pid);
+void		entity_delete(u64 id);
+void		entity_clean(Entity*); // clean entity data without removing
+Entity		entity_extract_now(u64 id); // removes, returns ownership
+bool		entity_valid(u64 id);
+
+Entity*		entity_get(u64 id);
+u64		entity_id_at(u32 dense_idx);
+u64		entity_id_from_pid(u64 pid);
+Entity*		entity_data(void);
+u32		entity_count(void);
+u64		entity_next_pid(void);
+
+bool		entity_set_parent(u64 id, u64 parent_id);
+
+/* transform component data */
+Matrix		entity_world_matrix(u64 id);
+/* space identifies the reference entity, 0 means world space. */
+Vec3		entity_point_to_world(u64 space, Vec3 point);
+bool		entity_point_to_local(u64 space, Vec3 point, Vec3 *out);
+
+Vec3		entity_world_pos(u64 id);
+Quaternion	entity_world_rot(u64 id);
+void		entity_set_world_pos(Entity*, Vec3);
+void		entity_set_world_rot(Entity*, Quaternion);
+
+#endif