From 9add408984464bd6b3cc018bb14c3d69ad0a2898 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Tue, 8 Oct 2024 19:56:08 +1100
Subject: New flying enemy that drops arrows

---
 Makefile                   |   4 +++
 config.h                   |   2 ++
 enemy.c                    |  74 +++++++++++++++++++++++++++++++++++++++++++++
 intermediate/arms.bmp      | Bin 41538 -> 41538 bytes
 intermediate/arrow.anm     |   2 ++
 intermediate/fly_left.anm  |  11 +++++++
 intermediate/fly_right.anm |  11 +++++++
 intermediate/npc.bmp       | Bin 37002 -> 49290 bytes
 map.c                      |  34 +++++++++++++++++++++
 obj.h                      |  24 +++++++++++++--
 player.c                   |  13 ++++++++
 projectile.c               |  59 ++++++++++++++++++++++++++++++++++++
 world.c                    |  20 ++++++++++++
 world.h                    |  13 ++++++--
 14 files changed, 263 insertions(+), 4 deletions(-)
 create mode 100644 intermediate/arrow.anm
 create mode 100644 intermediate/fly_left.anm
 create mode 100644 intermediate/fly_right.anm
 create mode 100644 projectile.c

diff --git a/Makefile b/Makefile
index 61b0cf4..d91d34e 100644
--- a/Makefile
+++ b/Makefile
@@ -58,6 +58,7 @@ sources = \
 	physics.c \
 	plat.c \
 	player.c \
+	projectile.c \
 	random.c \
 	rect.c \
 	render.c \
@@ -73,6 +74,7 @@ image_sources = \
 	$(int_dir)/rooms.bmp \
 
 anim_sources = \
+	$(int_dir)/arrow.anm \
 	$(int_dir)/demon_fly_left.anm \
 	$(int_dir)/demon_fly_right.anm \
 	$(int_dir)/demon_idle_left.anm \
@@ -83,6 +85,8 @@ anim_sources = \
 	$(int_dir)/demon_walk_right.anm \
 	$(int_dir)/fade_in.anm \
 	$(int_dir)/fade_out.anm \
+	$(int_dir)/fly_left.anm \
+	$(int_dir)/fly_right.anm \
 	$(int_dir)/guy_fall_left.anm \
 	$(int_dir)/guy_fall_right.anm \
 	$(int_dir)/guy_idle_left.anm \
diff --git a/config.h b/config.h
index 906f097..5a0ccb9 100644
--- a/config.h
+++ b/config.h
@@ -53,5 +53,7 @@
 #define enemy_touch_damage 1
 #define enemy_knockback (4 << fbits)
 #define enemy_hurt_freeze 1
+#define enemy_arrow_cooldown 60
+#define enemy_arrow_damage 2
 
 #endif
diff --git a/enemy.c b/enemy.c
index 5901445..467b45c 100644
--- a/enemy.c
+++ b/enemy.c
@@ -18,6 +18,8 @@ int get_enemy_hp(Enemy_Type t) {
 	switch (t) {
 		case enemy_demon:
 			return 3;
+		case enemy_fly:
+			return 2;
 	}
 	return 0;
 }
@@ -30,6 +32,12 @@ void get_enemy_rect(Enemy_Type t, Rect* d) {
 			d->w = 12;
 			d->h = 14;
 			break;
+		case enemy_fly:
+			d->x = 2;
+			d->y = 6;
+			d->w = 11;
+			d->h = 7;
+			break;
 	}
 }
 
@@ -45,6 +53,7 @@ void init_enemy(Enemy* e, Enemy_Type t, int x, int y) {
 	e->face = face_left;
 	e->state = enemy_state_patrol;
 	e->inv = 0;
+	e->timer = 0;
 }
 
 void update_enemy_anim(Enemy* e) {
@@ -214,11 +223,75 @@ void update_demon_move(Enemy* e, World* w) {
 	}
 }
 
+void update_fly_move(Enemy* e, World* w) {
+	(void)e;
+	(void)w;
+	if (e->state == enemy_state_patrol) {
+		const Map* m = &w->map;
+		const Player* p = &w->player;
+		int d2g = 0, d2c = 0, y;
+		int tx = (e->x >> fbits) / map_tile_size;
+		int ty = (e->y >> fbits) / map_tile_size;
+		for (y = ty; y < map_h; y++, d2g++)
+			if (m->collision[tx + y * map_w])
+				break;
+		for (y = ty; y >= 0; y--, d2c++)
+			if (m->collision[tx + y * map_w])
+				break;
+		ty =
+			((e->y >> fbits) + (map_tile_size >> 1)) /
+			map_tile_size;
+		if (e->face == face_left) {
+			tx = (
+				(e->x >> fbits) - (map_tile_size >> 1)) /
+				map_tile_size;
+		} else {
+			tx = (
+				(e->x >> fbits) + map_tile_size +
+				(map_tile_size >> 1)) /
+				map_tile_size;
+		}
+		if (tile_at(m, tx, ty))
+			e->face = !e->face;
+		if (d2g < 3 && d2c > 2)
+			e->vy -= 3 * (f1 / (d2g + 1));
+		e->vx = e->face == face_right? f1: -f1;
+		if (!e->grounded)
+			e->vx = (e->vx << fbits) / f1;
+		if (
+			e->timer > enemy_arrow_cooldown &&
+			p->y > e->y &&
+			absolute((e->x + f1 * 8) - (p->x + f1 * 8)) < f1 * 8
+		) {
+			Rect r;
+			r.x = 0;
+			r.y = 0;
+			r.w = 3;
+			r.h = 12;
+			e->timer = 0;
+			inst_projectile(
+				w,
+				e->x + f1 * 8,
+				e->y,
+				&r,
+				asset_id_arrow_anm
+			);
+		}
+	}
+	e->anim =
+		e->face == face_left?
+		asset_id_fly_left_anm:
+		asset_id_fly_right_anm;
+}
+
 void update_enemy_move(Enemy* e, World* w) {
 	switch (e->t) {
 		case enemy_demon:
 			update_demon_move(e, w);
 			break;
+		case enemy_fly:
+			update_fly_move(e, w);
+			break;
 	}
 }
 
@@ -227,6 +300,7 @@ int update_enemy(Enemy* e, World* w) {
 	update_enemy_hurt(e, w);
 	update_enemy_move(e, w);
 	update_enemy_phys(e, &w->map);
+	e->timer++;
 	return e->hp <= 0;
 }
 
diff --git a/intermediate/arms.bmp b/intermediate/arms.bmp
index 4a0664f..299bd16 100644
Binary files a/intermediate/arms.bmp and b/intermediate/arms.bmp differ
diff --git a/intermediate/arrow.anm b/intermediate/arrow.anm
new file mode 100644
index 0000000..52447af
--- /dev/null
+++ b/intermediate/arrow.anm
@@ -0,0 +1,2 @@
+1
+{ 222, 34, 3, 12 }
diff --git a/intermediate/fly_left.anm b/intermediate/fly_left.anm
new file mode 100644
index 0000000..9fc3735
--- /dev/null
+++ b/intermediate/fly_left.anm
@@ -0,0 +1,11 @@
+1
+{ 0,  112, 16, 16 }
+{ 16, 112, 16, 16 }
+{ 32, 112, 16, 16 }
+{ 48, 112, 16, 16 }
+{ 64, 112, 16, 16 }
+{ 80, 112, 16, 16 }
+{ 64, 112, 16, 16 }
+{ 48, 112, 16, 16 }
+{ 32, 112, 16, 16 }
+{ 16, 112, 16, 16 }
diff --git a/intermediate/fly_right.anm b/intermediate/fly_right.anm
new file mode 100644
index 0000000..ae4ef6c
--- /dev/null
+++ b/intermediate/fly_right.anm
@@ -0,0 +1,11 @@
+1
+{ 0,  96, 16, 16 }
+{ 16, 96, 16, 16 }
+{ 32, 96, 16, 16 }
+{ 48, 96, 16, 16 }
+{ 64, 96, 16, 16 }
+{ 80, 96, 16, 16 }
+{ 64, 96, 16, 16 }
+{ 48, 96, 16, 16 }
+{ 32, 96, 16, 16 }
+{ 16, 96, 16, 16 }
diff --git a/intermediate/npc.bmp b/intermediate/npc.bmp
index 9a961a7..ebcd40a 100644
Binary files a/intermediate/npc.bmp and b/intermediate/npc.bmp differ
diff --git a/map.c b/map.c
index 2acd988..5c0cf78 100644
--- a/map.c
+++ b/map.c
@@ -152,6 +152,7 @@ void generate_enemies(const Map* m, World* w) {
 	(m->collision[x + y * map_w] == 1 && \
 	 m->collision[x + (y - 1) * map_w] == 0)
 	int x, y, ex = map_w - 1, ey = map_h - 1;
+	/* enemies on platforms */
 	for (y = 1; y < ey; y++) {
 		for (x = 1; x < ex; x++) {
 			int plat = -1;
@@ -176,6 +177,39 @@ void generate_enemies(const Map* m, World* w) {
 			for (; check && x < ex; x++);
 		}
 	}
+	/* flying enemies */
+	for (y = 1; y < ey; y++)
+		for (x = 1; x < ex; x++) {
+			Rect rect = { 0 };
+			int i, j;
+			rect.x = x;
+			rect.y = y;
+			for (j = y; j < ey; j++) {
+				if (m->collision[i + j * map_w])
+					rect.h = 0;
+				for (i = x, rect.w = 0; i < ex && rect.h > 3; i++) {
+					if (!m->collision[i + j * map_w])
+						rect.w++;
+					if (rect.w > 4) {
+						Enemy* e;
+						e = inst_enemy(
+							w,
+							enemy_fly,
+							((x + (rect.w >> 1)) * map_tile_size) << fbits,
+							((y + (rect.h >> 1)) * map_tile_size) << fbits
+						);
+						e->face = get_r() & 1;
+						x = i;
+						y = j;
+						rect.w = 0;
+						rect.h = 0;
+						goto found;
+					}
+				}
+				rect.h++;
+			}
+			found:;
+		}
 }
 
 void generate_floor(Map* m, World* w) {
diff --git a/obj.h b/obj.h
index 98f2ebf..2227a64 100644
--- a/obj.h
+++ b/obj.h
@@ -79,7 +79,8 @@ int update_effect(Effect* e);
 void ren_effect(const Effect* e, struct Renderer* r);
 
 typedef enum {
-	enemy_demon
+	enemy_demon,
+	enemy_fly
 } Enemy_Type;
 
 typedef struct {
@@ -87,7 +88,7 @@ typedef struct {
 	int x, y, vx, vy;
 	int hp, frame, anim;
 	int grounded, headbutted, on_ramp;
-	int state, inv;
+	int state, inv, timer;
 	Face face;
 	Rect rect;
 } Enemy;
@@ -116,4 +117,23 @@ int update_deathzone(Deathzone* d);
 
 void ren_hud(const struct World* w, struct Renderer* r);
 
+typedef struct {
+	Rect r, s;
+	int anim, frame;
+	int x, y, vx, vy;
+} Projectile;
+
+void init_projectile(
+	Projectile* p,
+	int x,
+	int y,
+	const Rect* r,
+	int anim
+);
+int update_projectile(
+	Projectile* p,
+	const struct World* w
+);
+void ren_projectile(const Projectile* p, struct Renderer* r);
+
 #endif
diff --git a/player.c b/player.c
index 4a83a91..40ab92b 100644
--- a/player.c
+++ b/player.c
@@ -201,6 +201,19 @@ void update_player_hurt(Player* p, World* w) {
 			goto took_damage;
 		}
 	}
+	for (i = 0; i < w->projectile_count; i++) {
+		const Projectile* pr = &w->projectiles[i];
+		Rect r2;
+		r2.x = pr->x >> fbits;
+		r2.y = pr->y >> fbits;
+		r2.w = pr->r.w;
+		r2.h = pr->r.h;
+		if (rects_overlap(&r, &r2)) {
+			p->hp -= enemy_arrow_damage;
+			inst_effect(w, cx, cy, 0, 0, 32);
+			goto took_damage;
+		}
+	}
 	return;
 took_damage:
 	p->inv = player_inv_frames;
diff --git a/projectile.c b/projectile.c
new file mode 100644
index 0000000..ce68e8f
--- /dev/null
+++ b/projectile.c
@@ -0,0 +1,59 @@
+#include "animation.h"
+#include "asset.h"
+#include "maths.h"
+#include "obj.h"
+#include "physics.h"
+#include "render.h"
+#include "world.h"
+
+void init_projectile(
+	Projectile* p,
+	int x,
+	int y,
+	const Rect* r,
+	int anim
+) {
+	p->r = *r;
+	p->frame = 0;
+	p->anim = anim;
+	p->x = x;
+	p->y = y;
+	p->vx = 0;
+	p->vy = 0;
+	p->s.x = 0;
+	p->s.y = 0;
+	p->s.w = 0;
+	p->s.h = 0;
+}
+
+int update_projectile(
+	Projectile* p,
+	const World* w
+) {
+	Rect r = p->r;
+	int grounded = 1, headbutted = 1, on_ramp = 0;
+	const Animation* a = get_animation(p->anim);
+	r.x <<= fbits;
+	r.y <<= fbits;
+	r.w <<= fbits;
+	r.h <<= fbits;
+	update_body(
+		&w->map,
+		&p->x,
+		&p->y,
+		&p->vx,
+		&p->vy,
+		&grounded,
+		&headbutted,
+		&on_ramp,
+		&r
+	);
+	update_anim(a, &p->frame, &p->s);
+	return !grounded;
+}
+
+void ren_projectile(const Projectile* p, Renderer* r) {
+	const Bitmap* bm = get_bitmap(asset_id_arms_img);
+	ren_map(r, p->x >> fbits, p->y >> fbits, &p->s, bm);
+}
+
diff --git a/world.c b/world.c
index 52e2c5a..8d34b21 100644
--- a/world.c
+++ b/world.c
@@ -6,6 +6,7 @@ void init_world(World* w) {
 	w->enemy_count = 0;
 	w->deathzone_count = 0;
 	w->effect_count = 0;
+	w->projectile_count = 0;
 	w->frame = 0;
 	w->freeze = 0;
 	init_player(&w->player);
@@ -70,6 +71,20 @@ Effect* inst_effect(
 	return e;
 }
 
+Projectile* inst_projectile(
+	World* w,
+	int x,
+	int y,
+	const Rect* r,
+	int anim
+) {
+	Projectile* p;
+	assert(w->projectile_count < max_projectiles);
+	p = &w->projectiles[w->projectile_count++];
+	init_projectile(p, x, y, r, anim);
+	return p;
+}
+
 void update_world(World* w, const App* a) {
 	int i;
 	if (w->laser.life)
@@ -91,6 +106,9 @@ void update_world(World* w, const App* a) {
 	for (i = w->enemy_count - 1; i >= 0; i--)
 		if (update_enemy(&w->enemies[i], w))
 			w->enemies[i] = w->enemies[--w->enemy_count];
+	for (i = w->projectile_count - 1; i >= 0; i--)
+		if (update_projectile(&w->projectiles[i], w))
+			w->projectiles[i] = w->projectiles[--w->projectile_count];
 	w->frame++;
 }
 
@@ -104,6 +122,8 @@ void ren_world(const World* w, struct Renderer* r) {
 		ren_effect(&w->effects[i], r);
 	for (i = 0; i < w->enemy_count; i++)
 		ren_enemy(&w->enemies[i], r);
+	for (i = 0; i < w->projectile_count; i++)
+		ren_projectile(&w->projectiles[i], r);
 	if (w->laser.life)
 		ren_laser(&w->laser, r);
 	ren_hud(w, r);
diff --git a/world.h b/world.h
index 81feb6f..a0f6506 100644
--- a/world.h
+++ b/world.h
@@ -4,10 +4,11 @@
 #include "map.h"
 #include "obj.h"
 
-#define max_particles 32
+#define max_particles 16
 #define max_enemies 16
 #define max_deathzones 16
 #define max_effects 16
+#define max_projectiles 16
 
 struct Renderer;
 
@@ -16,8 +17,9 @@ typedef struct World {
 	Enemy enemies[max_enemies];
 	Deathzone deathzones[max_deathzones];
 	Effect effects[max_effects];
+	Projectile projectiles[max_projectiles];
 	int particle_count, enemy_count, effect_count;
-	int deathzone_count;
+	int deathzone_count, projectile_count;
 	Player player;
 	Laser laser;
 	Map map;
@@ -55,6 +57,13 @@ Effect* inst_effect(
 	int vy,
 	int c
 );
+Projectile* inst_projectile(
+	World* w,
+	int x,
+	int y,
+	const Rect* r,
+	int anim
+);
 void update_world(World* w, const struct App* a);
 void ren_world(const World* w, struct Renderer* r);
 
-- 
cgit v1.2.3-54-g00ecf