Add pre/post logic/draw handlers

src/internal.c

@@ -28,6 +28,9 @@ SYMBOL_INTERNAL void DrawGamestates(struct Game* game) {
 	ClearScreen(game);
 	al_set_target_backbuffer(game->display);
 	struct Gamestate* tmp = game->_priv.gamestates;
+	if (game->handlers.predraw) {
+		(*game->handlers.predraw)(game);
+	}
 	while (tmp) {
 		if ((tmp->loaded) && (tmp->started)) {
 			game->_priv.current_gamestate = tmp;
@@ -35,10 +38,16 @@ SYMBOL_INTERNAL void DrawGamestates(struct Game* game) {
 		}
 		tmp = tmp->next;
 	}
+	if (game->handlers.postdraw) {
+		(*game->handlers.postdraw)(game);
+	}
 }
 
 SYMBOL_INTERNAL void LogicGamestates(struct Game* game, double delta) {
 	struct Gamestate* tmp = game->_priv.gamestates;
+	if (game->handlers.prelogic) {
+		(*game->handlers.prelogic)(game, delta);
+	}
 	while (tmp) {
 		if ((tmp->loaded) && (tmp->started) && (!tmp->paused)) {
 			game->_priv.current_gamestate = tmp;
@@ -46,6 +55,9 @@ SYMBOL_INTERNAL void LogicGamestates(struct Game* game, double delta) {
 		}
 		tmp = tmp->next;
 	}
+	if (game->handlers.postlogic) {
+		(*game->handlers.postlogic)(game, delta);
+	}
 }
 
 SYMBOL_INTERNAL void ReloadGamestates(struct Game* game) {

src/libsuperderpy.c

@@ -76,6 +76,10 @@ SYMBOL_EXPORT struct Game* libsuperderpy_init(int argc, char** argv, const char*
 
 	game->handlers.event = NULL;
 	game->handlers.destroy = NULL;
+	game->handlers.prelogic = NULL;
+	game->handlers.postlogic = NULL;
+	game->handlers.predraw = NULL;
+	game->handlers.postdraw = NULL;
 
 	game->config.fullscreen = strtol(GetConfigOptionDefault(game, "SuperDerpy", "fullscreen", "1"), NULL, 10);
 	game->config.music = strtol(GetConfigOptionDefault(game, "SuperDerpy", "music", "10"), NULL, 10);

src/libsuperderpy.h

@@ -143,6 +143,10 @@ struct Game {
 	struct {
 		bool (*event)(struct Game* game, ALLEGRO_EVENT* ev);
 		void (*destroy)(struct Game* game);
+		void (*prelogic)(struct Game* game, double delta);
+		void (*postlogic)(struct Game* game, double delta);
+		void (*predraw)(struct Game* game);
+		void (*postdraw)(struct Game* game);
 	} handlers;
 
 	LIBSUPERDERPY_DATA_TYPE* data;