i'm not sorry

src/background.c

@@ -15,7 +15,7 @@ draw_square(double size, double angle)
 void
 background_update(Game *g)
 {
-	if (game_entity_count(g, ET_player) > 0)
+	if (game_entity_count(g, entity_type("player")) > 0)
 		tick += 1.0;
 	else
 		tick += 0.25;

src/entity.c

@@ -2,9 +2,12 @@
 #include "game.h"
 #include "map.h"
 #include "cfg.h"
+#include "entitytag.h"
 #include <stddef.h>
+#include <string.h>
+#include <stdio.h>
 
-void
+static void
 _points(Entity *this, int ox, int oy, int *x0, int *x1, int *y0, int *y1)
 {
 	*x0 = this->pos[0] - this->width / 2 + ox;
@@ -13,6 +16,15 @@ _points(Entity *this, int ox, int oy, int *x0, int *x1, int *y0, int *y1)
 	*y1 = *y0 + this->height - 1;
 }
 
+unsigned int
+entity_type(const char *type)
+{
+	for (unsigned int i = 0; i < num_entitytags; i++)
+		if (strcmp(type, entitytags[i]) == 0)
+			return i + 1;
+	fprintf(stderr, "unknown type '%s'\n", type);
+	return 0;
+}
 
 bool
 entity_collide(Entity *this, Game *g, int ox, int oy)

src/entity.h

@@ -2,18 +2,11 @@
 #include "player.h"
 #include "exit.h"
 #include "deathpart.h"
-#include "spike.h"
 #include <stdbool.h>
 
 struct Game;
 
-enum {
-	ET_NONE,
-	ET_player,
-	ET_exit,
-	ET_deathpart,
-	ET_spike,
-};
+enum { ET_NONE = 0 };
 
 typedef struct Entity Entity;
 struct Entity {
@@ -36,6 +29,7 @@ struct Entity {
 	};
 };
 
+unsigned int entity_type(const char *type);
 bool entity_collide(Entity *this, struct Game *g, int ox, int oy);
 bool entity_meet(Entity *this, Entity *other);
 Entity *entity_place_meeting(Entity *this, struct Game *g, unsigned int type);

src/entityimpl.h

@@ -2,17 +2,21 @@
 #include "game.h"
 #include "cfg.h"
 #include "lzy.h"
+#include "entitytag.h"
 #include <string.h>
 
 #define IMPL_UPDATE() static Entity*update(Entity*this,Game*g){(void)this,(void)g;
 #define IMPL_DRAW() static Entity*draw(Entity*this,Game*g){(void)this,(void)g;
-#define IMPL_INIT(X) Entity *X##_init(Entity *this, int x, int y) { do { \
+#define IMPL_INIT(X) __attribute__((constructor)) static void init_tag() { \
+	entitytags[num_entitytags++] = #X; \
+} \
+Entity *X##_init(Entity *this, int x, int y) { do { \
 	memset(this, 0, sizeof(*this)); \
 	this->update = update; \
 	this->draw = draw; \
 	this->pos[0] = x; \
 	this->pos[1] = y; \
-	this->type = ET_##X; \
+	this->type = entity_type(#X); \
 } while(0);
 #define IMPL_INIT_END
 #define IMPL_END return this; }

src/entitytag.c

@@ -0,0 +1,4 @@
+#include "entitytag.h"
+
+unsigned int num_entitytags = 0;
+const char *entitytags[256] = {0};

src/entitytag.h

@@ -0,0 +1,4 @@
+#pragma once
+
+extern unsigned int num_entitytags;
+extern const char *entitytags[256];

src/game.c

@@ -31,7 +31,8 @@ game_update(Game *this)
 	}
 	if (this->queue_next_scene) {
 		this->queue_next_scene = false;
-		this->player_dir = game_get_entity(this, ET_exit)->exit.dir;
+		this->player_dir = game_get_entity(this,
+		                                   entity_type("exit"))->exit.dir;
 		map_next();
 		game_restart_scene(this);
 		return;

src/player.c

@@ -54,7 +54,7 @@ IMPL_UPDATE() {
 		this->player.dirx *= -1;
 
 	if (this->bonk_ceiling ||
-	    entity_place_meeting(this, g, ET_spike) != NULL) {
+	    entity_place_meeting(this, g, entity_type("spike")) != NULL) {
 		int dy = this->pos[1] - 6;
 		for (int y = 0; y < 7; y++) {
 			int dx = this->pos[0] - 6;
@@ -68,7 +68,7 @@ IMPL_UPDATE() {
 		g->queue_restart_scene = 45;
 	}
 
-	if (entity_place_meeting(this, g, ET_exit) != NULL)
+	if (entity_place_meeting(this, g, entity_type("exit")) != NULL)
 		g->queue_next_scene = true;
 } IMPL_END