From 5ef6a71e935e2c3d1e5f9828e8cdbd78403a06a0 Mon Sep 17 00:00:00 2001
From: quou <quou@disroot.org>
Date: Sun, 7 May 2023 09:46:39 +1000
Subject: Add some frames where the skulls are red after being damaged.

---
 collision_system.c     |   2 ++
 components.h           |   1 +
 enemy.c                |  18 ++++++++++++++----
 game_config.h          |   2 ++
 intermediate/enemy.bmp | Bin 8330 -> 8330 bytes
 sprite.c               |   8 ++++----
 sprite.h               |   4 ++--
 7 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/collision_system.c b/collision_system.c
index ed05817..2bb8cdb 100644
--- a/collision_system.c
+++ b/collision_system.c
@@ -6,6 +6,7 @@
 #include "components.h"
 #include "config.h"
 #include "fx.h"
+#include "game_config.h"
 #include "rect.h"
 #include "standard.h"
 #include "world.h"
@@ -62,6 +63,7 @@ static void handle_bullet_vs_enemy(
 
 	pos = &world->positions[bullet];
 	e = &world->enemies[enemy];
+	e->being_damaged = enemy_hit_frames;
 	e->hp--;
 	destroy_entity(world, bullet);
 	new_player_bullet_explosion(world, pos->x, pos->y);
diff --git a/components.h b/components.h
index 4c1b950..fb0df18 100644
--- a/components.h
+++ b/components.h
@@ -36,6 +36,7 @@ typedef struct {
 	int hp;
 	int backpedal;
 	int shoot_timer;
+	int being_damaged;
 } CEnemy;
 
 typedef struct {
diff --git a/enemy.c b/enemy.c
index 710a280..04baec4 100644
--- a/enemy.c
+++ b/enemy.c
@@ -37,7 +37,7 @@ Entity new_skull(World* world, int x, int y) {
 	col->w = 14 << fbits;
 	col->h = 14 << fbits;
 
-	init_csprite(sprite, sprite_skull_right);
+	init_csprite(sprite, sprite_skull);
 
 	enemy->hp = skull_hp;
 	enemy->shoot_timer = 0;
@@ -91,6 +91,7 @@ void enemy_system(World* world) {
 	unsigned bits;
 	CPosition* pos;
 	CEnemy* enemy;
+	CSprite* sprite;
 	Player* player;
 	CPosition* ppos;
 	int dpx, dpy, tpx, tpy, d;
@@ -118,10 +119,12 @@ void enemy_system(World* world) {
 		if (
 			(bits & ctype_position) &&
 			(bits & ctype_enemy) &&
-			(bits & ctype_skull)
+			(bits & ctype_skull) &&
+			(bits & ctype_sprite)
 		) {
-			pos = &world->positions[i];
-			enemy = &world->enemies[i];
+			pos    = &world->positions[i];
+			enemy  = &world->enemies[i];
+			sprite = &world->sprites[i];
 
 			dpx = ((ppos->x - pos->x) >> 4) + 256;
 			dpy = ((ppos->y - pos->y) >> 4) + 256;
@@ -129,6 +132,13 @@ void enemy_system(World* world) {
 			tpy = dpy;
 			d = ((dpx * dpx) >> fbits) + ((dpy * dpy) >> fbits);
 
+			if (enemy->being_damaged) {
+				enemy->being_damaged--;
+				init_csprite(sprite, sprite_skull_damaged);
+			} else {
+				init_csprite(sprite, sprite_skull);
+			}
+
 			if (d < 10 << fbits) {
 				dpx = -dpx;
 				dpy = -dpy;
diff --git a/game_config.h b/game_config.h
index 4e955a9..3b0f9d3 100644
--- a/game_config.h
+++ b/game_config.h
@@ -6,6 +6,8 @@
 #define player_max_hp 3
 #define player_invul_frames 50
 
+#define enemy_hit_frames 10
+
 #define skull_hp 3
 #define skull_speed (1 << fbits)
 
diff --git a/intermediate/enemy.bmp b/intermediate/enemy.bmp
index da1e068..ee0df40 100644
Binary files a/intermediate/enemy.bmp and b/intermediate/enemy.bmp differ
diff --git a/sprite.c b/sprite.c
index e2914ce..2b5647a 100644
--- a/sprite.c
+++ b/sprite.c
@@ -21,15 +21,15 @@ static const Sprite sprites[] = {
 		asset_id_bullet,
 		{ 14, 14, 14, 9 }
 	},
-	/* sprite_skull_left */
+	/* sprite_skull */
 	{
 		asset_id_enemy,
-		{ 16, 0, 16, 16 }
+		{ 0, 0, 16, 16 }
 	},
-	/* sprite_skull_right */
+	/* sprite_skull_damaged */
 	{
 		asset_id_enemy,
-		{ 0, 0, 16, 16 }
+		{ 16, 0, 16, 16 }
 	},
 	/* sprite_skull_debris_1 */
 	{
diff --git a/sprite.h b/sprite.h
index 5fd6b2a..8f9f736 100644
--- a/sprite.h
+++ b/sprite.h
@@ -10,8 +10,8 @@ typedef enum {
 	sprite_player_bullet_right,
 	sprite_player_bullet_up,
 	sprite_player_bullet_down,
-	sprite_skull_left,
-	sprite_skull_right,
+	sprite_skull,
+	sprite_skull_damaged,
 	sprite_skull_debris_1,
 	sprite_skull_debris_2,
 	sprite_skull_debris_3,
-- 
cgit v1.2.3-54-g00ecf