char: Add collision detection/handling

4 files changed, 39 insertions, 0 deletions

diff --git a/src/char/char.c b/src/char/char.c
index 0ab7145..4a4a4e7 100644
--- a/src/char/char.c
+++ b/src/char/char.c
@@ -126,6 +126,24 @@ mf_char_update(struct mf_char *c)
 }
 
 int
+mf_char_collision(struct mf_char *c1, struct mf_char *c2, int handle)
+{
+	if (c1->cur_x == c2->cur_x && c1->cur_y == c2->cur_y) goto hit;
+	if (c1->cur_x == c2->new_x && c1->cur_y == c2->new_y) goto hit;
+	if (c1->new_x == c2->cur_x && c1->new_y == c2->cur_y) goto hit;
+	if (c1->new_x == c2->new_x && c1->new_y == c2->new_y) goto hit;
+
+	return 0;
+
+ hit:
+	if (handle == SDL_TRUE) {
+		c1->collide(c1);
+		c2->collide(c2);
+	}
+	return 1;
+}
+
+int
 mf_char_render(struct mf_char *c, SDL_Renderer *renderer)
 {
 	int    e   = 0;
diff --git a/src/char/char.h b/src/char/char.h
index f5054d5..02bddaa 100644
--- a/src/char/char.h
+++ b/src/char/char.h
@@ -54,6 +54,7 @@ struct mf_char {
 	int               (*update)(struct mf_char *);
 	int               (*step)(struct mf_char *);
 	int               (*turn)(struct mf_char *);
+	void              (*collide)(struct mf_char *);
 	int               (*render)(struct mf_char *, SDL_Renderer *);
 	void              (*destroy)(struct mf_char *);
 };
@@ -70,6 +71,7 @@ mf_char_new(size_t size);
 		c->update  = &_mf_##name##_update; \
 		c->step    = &_mf_##name##_step; \
 		c->turn    = &_mf_##name##_turn; \
+		c->collide = &_mf_##name##_collide; \
 		c->render  = &_mf_##name##_render; \
 		c->destroy = &_mf_##name##_destroy; \
 		t_c = (struct mf_##name *) c; \
diff --git a/src/char/enemy.c b/src/char/enemy.c
index 82cc16b..fb259a2 100644
--- a/src/char/enemy.c
+++ b/src/char/enemy.c
@@ -97,6 +97,20 @@ _mf_enemy_turn(struct mf_char *c)
 	return 0;
 }
 
+static void
+_mf_enemy_collide(struct mf_char *c)
+{
+	/* Don't go forward unless necessary */
+	switch (c->cur_dir) {
+		case MF_CHAR_DIR_U_: c->cur_dir = MF_CHAR_DIR_D_; break;
+		case MF_CHAR_DIR_D_: c->cur_dir = MF_CHAR_DIR_U_; break;
+		case MF_CHAR_DIR_L_: c->cur_dir = MF_CHAR_DIR_R_; break;
+		case MF_CHAR_DIR_R_: c->cur_dir = MF_CHAR_DIR_L_; break;
+		default:             c->cur_dir = MF_CHAR_DIR_N_; break;
+	}
+	_mf_enemy_step(c);
+}
+
 static int
 _mf_enemy_render(struct mf_char *c __attribute__((__unused__)),
 		SDL_Renderer *renderer __attribute__((__unused__)))
diff --git a/src/char/player.c b/src/char/player.c
index eff0dbd..fdeac5c 100644
--- a/src/char/player.c
+++ b/src/char/player.c
@@ -74,6 +74,11 @@ _mf_player_render(struct mf_char *c __attribute__((__unused__)),
 }
 
 static void
+_mf_player_collide(struct mf_char *c __attribute__((__unused__)))
+{
+}
+
+static void
 _mf_player_destroy(struct mf_char *c __attribute__((__unused__)))
 {
 }