add flying enemy

3 files changed, 473 insertions, 0 deletions

diff --git a/src/flier.c b/src/flier.c
new file mode 100644
index 0000000..bfce46a
--- /dev/null
+++ b/src/flier.c
@@ -0,0 +1,469 @@
+#include "main.h"
+#include "entity.h"
+#include "loader.h"
+#include "tilemap.h"
+#include <stdbool.h>
+#include <math.h>
+
+#define SIZE 4
+#define ACCELERATION 1
+#define FRICTION 2
+#define MAX_SPEED 16
+#define GRAVITY 1
+#define WALKABLE_CHECK_DISTANCE 10
+#define IDLE_TIME 90
+#define ATTACK_DELAY 120
+#define ATTACK_DELAY2 60
+#define ATTACK_REPEAT 60
+
+struct flier_ext {
+	unsigned idle_time, attack_delay, attack_delay2, attack_repeat;
+	signed facing_x, facing_y;
+	struct vec2 *path;
+	size_t current_node, path_length;
+	bool reached_x, reached_y;
+};
+
+enum {
+	FLIER_NONE,
+	FLIER_IDLE,
+	FLIER_PATROL,
+	FLIER_ALERT_IDLE,
+	FLIER_ALERT_CHASE,
+	FLIER_ALERT_RUN,
+	FLIER_ALERT_ATTACK,
+};
+
+enum {
+	FLIER_A_IDLE,
+	FLIER_A_IDLE2,
+	FLIER_A_IDLE3,
+	FLIER_A_IDLE4,
+	FLIER_A_WALK,
+	FLIER_A_WALK2,
+	FLIER_A_WALK3,
+	FLIER_A_WALK4,
+	FLIER_A_ATTACK,
+	FLIER_A_ATTACK2,
+};
+
+struct anim flier_anims[] = {
+	{FLIER_A_IDLE2, {0, 0, 16, 16}, 7},
+	{FLIER_A_IDLE3, {16, 0, 16, 16}, 7},
+	{FLIER_A_IDLE4, {32, 0, 16, 16}, 7},
+	{FLIER_A_IDLE, {16, 0, 16, 16}, 7},
+	{FLIER_A_WALK2, {0, 32, 16, 16}, 5},
+	{FLIER_A_WALK3, {16, 32, 16, 16}, 5},
+	{FLIER_A_WALK4, {32, 32, 16, 16}, 5},
+	{FLIER_A_WALK, {16, 32, 16, 16}, 5},
+	{FLIER_A_ATTACK2, {48, 0, 16, 16}, 3},
+	{FLIER_A_ATTACK, {48, 32, 16, 16}, 3},
+};
+
+static int bullet_update(struct projectile *self) {
+	self->x += self->velocity.x;
+	if (collision_solid(tilemap_tile(tilemap, from_fixed(self->x), from_fixed(self->y)))) {
+		self->velocity.x = -self->velocity.x;
+		self->x += self->velocity.x;
+	}
+		
+	self->y += self->velocity.y;
+	if (collision_solid(tilemap_tile(tilemap, from_fixed(self->x), from_fixed(self->y)))) {
+		self->velocity.y = -self->velocity.y;
+		self->y += self->velocity.y;
+	}
+
+	self->hp--;
+	int x = from_fixed(self->x);
+	int y = from_fixed(self->y);
+	self->hitbox = (struct hitbox) {.left = x, .right = x, .top = y, .bottom = y};
+	if (hitbox_overlap(self->hitbox, entities.player[0].hitbox)) {
+		entities.player[0].hurt(entities.player + 0, 1);
+		return 1;
+	}
+	if (self->hp == 0) {
+		return 1;
+		self->state = 0;
+	}
+	return 0;
+}
+
+static int bullet_draw(struct projectile *self, int camX, int camY) {
+	SDL_Rect rect = {4, 0, 4, 4};
+	SDL_RenderCopy(renderer, self->texture, &rect, &(SDL_Rect) {from_fixed(self->x) - camX - 1, from_fixed(self->y) - camY - 1, 4, 4});
+	SDL_RenderCopy(renderer, self->texture, &rect, &(SDL_Rect) {from_fixed(self->x - self->velocity.x) - camX - 1, from_fixed(self->y - self->velocity.y) - camY - 1, 4, 4});
+	return 0;
+}
+
+static void bullet_free(struct projectile *self) {}
+
+static collision_T collide(struct entity *self) {
+	return tilemap_area(tilemap, from_fixed(self->x) - SIZE / 2, from_fixed(self->y) - SIZE, from_fixed(self->x) + SIZE / 2, from_fixed(self->y));
+}
+
+static void move(struct entity *self, signed direction_x, signed direction_y, bool friction) {
+	int const dx = direction_x * ACCELERATION;
+	self->velocity.x += dx;
+	// deaccel
+	if (dx == 0 && friction) {
+		if (self->velocity.x < -FRICTION) {
+			self->velocity.x += FRICTION;
+		} else if (self->velocity.x > FRICTION) {
+			self->velocity.x -= FRICTION;
+		} else {
+			self->velocity.x = 0;
+		}
+	}
+	// speed cap
+	if (self->velocity.x > MAX_SPEED) {
+		self->velocity.x = MAX_SPEED;
+	} else if (self->velocity.x < -MAX_SPEED) {
+		self->velocity.x = -MAX_SPEED;
+	}
+	// x collision
+	self->x += self->velocity.x;
+	collision_T const cx = collide(self);
+	if (collision_solid(cx)) {
+		if (self->velocity.x < 0) {
+			self->x += to_fixed(8) - ((self->x - to_fixed(SIZE / 2)) % to_fixed(8)); // left
+		} else if (self->velocity.x == 0) {
+			//fputs("what?\n", stderr);
+		} else {
+			self->x -= ((self->x + to_fixed(SIZE / 2)) % to_fixed(8)); // right
+		}
+		self->velocity.x = -self->velocity.x;
+	}
+	#if 0
+	if (self->velocity.x < 0) {
+		self->facing = -1;
+	} else if (self->velocity.x > 0) {
+		self->facing = +1;
+	}
+	#endif
+	self->velocity.y += direction_y * ACCELERATION;
+	if (direction_y == 0 && friction) {
+		if (self->velocity.y < -FRICTION) {
+			self->velocity.y += FRICTION;
+		} else if (self->velocity.y > FRICTION) {
+			self->velocity.y -= FRICTION;
+		} else {
+			self->velocity.y = 0;
+		}
+	}
+	// speed cap
+	if (self->velocity.y > MAX_SPEED) {
+		self->velocity.y = MAX_SPEED;
+	} else if (self->velocity.y < -MAX_SPEED) {
+		self->velocity.y = -MAX_SPEED;
+	}
+	// y collision
+	self->y += self->velocity.y;
+	collision_T const cy = collide(self);
+	if (collision_solid(cy)) {
+		if (self->velocity.y < 0) {
+			self->y += to_fixed(8) - ((self->y - to_fixed(SIZE)) % to_fixed(8)); // up
+		} else if (self->velocity.y == 0) {
+			//fputs("what?\n", stderr);
+		} else {
+			self->y -= ((self->y) % to_fixed(8)); // down
+		}
+		self->velocity.y = -self->velocity.y;
+	}
+	
+	if (collision_hazard(cx | cy)) {
+		self->hurt(self, 1);
+	}
+	
+	self->hitbox.left = from_fixed(self->x) - SIZE / 2;
+	self->hitbox.right = from_fixed(self->x) + SIZE / 2;
+	self->hitbox.top = from_fixed(self->y) - SIZE;
+	self->hitbox.bottom = from_fixed(self->y);
+}
+
+static void move2(struct entity *self) {
+	int dx = 0, dy = 0;
+	struct flier_ext *const ext = self->ext;
+	struct vec2 const *node = ext->path + ext->current_node;
+	int const tx = node->x - self->x, ty = node->y - self->y;
+	if (ext->reached_x == false) {
+		dx = tx >= 0? 1: -1;
+	}
+	if (ext->reached_y == false) {
+		dy = ty >= 0? 1: -1;
+	}
+	move(self, dx, dy, true);
+	if (ext->reached_x == false) {
+		if (dx != (node->x - self->x >= 0? 1: -1)) {
+			ext->reached_x = true;
+		}
+	}
+	if (ext->reached_y == false) {
+		if (dy != (node->y - self->y >= 0? 1: -1)) {
+			ext->reached_y = true;
+		}
+	}
+}
+
+static void anim(struct entity *self, unsigned anim) {
+	self->anim = flier_anims[anim];
+}
+
+static void attack(struct entity const *const self) {
+	float const angle = atan2(entities.player[0].x - self->x, entities.player[0].y - self->y);
+	entities.projectile[entities.projectiles] = (struct projectile) {
+		.update = bullet_update,
+		.draw = bullet_draw,
+		.free = bullet_free,
+		.x = self->x, .y = self->y - to_fixed(3),
+		.velocity = (struct vec2) {to_fixed(sin(angle)), to_fixed(cos(angle))},
+		.hitbox = {
+			0, 0, 0, 0,
+		},
+		.state = FLIER_IDLE,
+		.hp = 300,
+		.timer = 0,
+		.facing = self->facing,
+		.faction = FACTION_ENEMY,
+		.iframes = 0,
+		.texture = NULL,
+		.ext = NULL,
+	};
+	//anim(entities->projectile + entities->projectiles, FLIER_A_IDLE);
+	entities.projectile[entities.projectiles].texture = res_get_texture("particles").data;
+	entities.projectiles++;
+}
+
+static void flier_free(struct entity *self) {
+	self->state = 0;
+	free(((struct flier_ext *) self->ext)->path);
+	free(self->ext), self->ext = NULL;
+}
+
+static int flier_update(struct entity *self) {
+	struct flier_ext *const ext = self->ext;
+	if (self->hp <= 0) {
+		flier_free(self);
+		entities.enemies--;
+		return 1;
+	}
+	switch (self->state) {
+		case FLIER_IDLE:
+			move(self, 0, 0, true);
+			self->timer--;
+			if (self->timer == 0) {
+				anim(self, FLIER_A_WALK);
+				self->state = FLIER_PATROL;
+			}
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) < to_fixed(64)) {
+				self->state = FLIER_ALERT_IDLE;
+				self->timer = ext->attack_delay;
+			}
+			break;
+
+		case FLIER_PATROL:
+			move2(self);
+			if (ext->reached_x && ext->reached_y) {
+				ext->current_node++;
+				if (ext->current_node == ext->path_length) {
+					ext->current_node = 0;
+				}
+				ext->reached_x = false;
+				ext->reached_y = false;
+				anim(self, FLIER_A_IDLE);
+				self->state = FLIER_IDLE;
+				self->timer = ext->idle_time;
+			}
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) < to_fixed(64)) {
+				anim(self, FLIER_A_IDLE);
+				self->state = FLIER_ALERT_IDLE;
+				self->timer = ext->attack_delay;
+			}
+			break;
+		
+		case FLIER_ALERT_IDLE:
+			move(self, 0, 0, false);
+			ext->facing_x = self->x > entities.player[0].x? -1: 1;
+			ext->facing_y = self->y > entities.player[0].y? -1: 1;
+			self->facing = ext->facing_x;
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) > to_fixed(64)) {
+				anim(self, FLIER_A_WALK);
+				self->state = FLIER_ALERT_CHASE;
+			}
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) > to_fixed(96)) {
+				self->state = FLIER_IDLE;
+			}
+			self->timer--;
+			if (self->timer == 0) {
+				anim(self, FLIER_A_ATTACK);
+				self->state = FLIER_ALERT_ATTACK;
+				self->timer = ext->attack_delay2;
+			}
+			break;
+
+		case FLIER_ALERT_CHASE:
+			ext->facing_x = self->x > entities.player[0].x? -1: 1;
+			ext->facing_y = self->y > entities.player[0].y? -1: 1;
+			move(self, ext->facing_x, ext->facing_y, true);
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) < to_fixed(64) /*|| !is_walkable(self->x + to_fixed(ext->facing * WALKABLE_CHECK_DISTANCE), self->y)*/) {
+				anim(self, FLIER_A_IDLE);
+				self->state = FLIER_ALERT_IDLE;
+				self->timer = ext->attack_delay;
+			}
+			break;
+
+		case FLIER_ALERT_ATTACK:
+			move(self, 0, 0, false);
+			ext->facing_x = self->x > entities.player[0].x? -1: 1;
+			self->facing = ext->facing_x;
+			if (self->timer > 0) {
+				self->timer--;
+			}
+			if (self->timer == 0) {
+				attack(self);
+				anim(self, FLIER_A_IDLE);
+				self->state = FLIER_ALERT_IDLE;
+				self->timer = ext->attack_repeat;
+			}
+			if (abs(entities.player[0].x - self->x) + abs(entities.player[0].y - self->y) > to_fixed(96)) {
+				anim(self, FLIER_A_IDLE);
+				self->state = FLIER_IDLE;
+				self->timer = ext->idle_time;
+			}
+			break;
+	}
+	if (self->iframes > 0) {
+		self->iframes--;
+	}
+	self->anim.length--;
+	if (self->anim.length == 0) {
+		anim(self, self->anim.frame);
+	}
+	return 0;
+}
+
+static int flier_init(struct entity *self) {
+	if (((struct flier_ext *) self->ext)->path == NULL) {
+		flier_free(self);
+		entities.enemies--;
+		return 1;
+	}
+	self->update = flier_update;
+	return flier_update(self);
+}
+
+static int flier_hurt(struct entity *self, int damage) {
+	if (self->iframes == 0) {
+		self->hp -= damage;
+		self->iframes = 60;
+		for (int x = -1; x <= 1; x += 2) {
+			for (int y = -1; y <= 1; y += 2) {
+				struct particle *part = entities.particle + entities.particles;
+				part->x = self->x;
+				part->y = self->y;
+				part->velocity = (struct vec2) {to_fixed(x), to_fixed(y) - 8};
+				part->rect = (SDL_Rect) {4, 0, 4, 4};
+				part->acceleration = (struct vec2) {0, 1};
+				part->hp = 30;
+				entities.particles++;
+			}
+		}
+	}
+	return 0;
+}
+
+static int flier_draw(struct entity *self, int camX, int camY) {
+	if (!(self->iframes & 0x4)) {
+		SDL_Rect rect = self->anim.rect;
+		if (self->facing == -1) {
+			rect.y += 16;
+		}
+		SDL_RenderCopy(renderer, self->texture, &rect, &(SDL_Rect) {from_fixed(self->x) - camX - 8, from_fixed(self->y) - camY - 12, 16, 16});
+	}
+	return 0;
+}
+
+struct entity *flier_new(struct entities *entities) {
+	struct entity *self = entities->enemy + entities->enemies;
+	*self = (struct entity) {
+		.update = flier_init,
+		.hurt = flier_hurt,
+		.draw = flier_draw,
+		.free = flier_free,
+		.x = 0, .y = 0,
+		.velocity = {.x = 0, .y = 0},
+		.hitbox = {
+			0, 0, 0, 0,
+		},
+		.state = FLIER_PATROL,
+		.hp = 3,
+		.timer = 0,
+		.facing = 1,
+		.faction = FACTION_ENEMY,
+		.iframes = 0,
+		.texture = NULL,
+		.ext = NULL,
+	};
+	self->ext = malloc(sizeof (struct flier_ext));
+	*(struct flier_ext *) self->ext = (struct flier_ext) {
+		.idle_time = IDLE_TIME,
+		.attack_delay = ATTACK_DELAY,
+		.attack_delay2 = ATTACK_DELAY2,
+		.attack_repeat = ATTACK_REPEAT,
+		.facing_x = 1,
+		.facing_y = 1,
+	};
+	anim(self, FLIER_A_WALK);
+	self->texture = res_get_texture("flier").data;
+	entities->enemies++;
+	return self;
+}
+
+int flier_property(struct entity *const restrict self, char const *const restrict property, char const *const restrict value) {
+	struct flier_ext *const ext = self->ext;
+	if (strcmp(property, "x") == 0) {
+		self->x = to_fixed(atoi(value));
+	} else if (strcmp(property, "y") == 0) {
+		self->y = to_fixed(atoi(value));
+	} else if (strcmp(property, "idle time") == 0) {
+		ext->idle_time = atoi(value);
+	} else if (strcmp(property, "attack delay") == 0) {
+		ext->attack_delay = atoi(value);
+	} else if (strcmp(property, "attack delay 2") == 0) {
+		ext->attack_delay2 = atoi(value);
+	} else if (strcmp(property, "attack repeat") == 0) {
+		ext->attack_repeat = atoi(value);
+	} else if (strcmp(property, "path") == 0) {
+		size_t spaces = 1, commas = 0;
+		for (size_t i = 0; value[i]; i++) {
+			if (value[i] == ' ') {
+				spaces++;
+			} else if (value[i] == ',') {
+				commas++;
+			}
+		}
+		if (spaces != commas) {
+			return 1;
+		}
+		ext->path = malloc(spaces * sizeof (*ext->path));
+		ext->path_length = spaces;
+		char *v = strdup(value), *vv = v; // stupid but it silences a warning
+		for (size_t i = 0; i < spaces; i++) {
+			ext->path[i].x = to_fixed(strtol(v, &v, 0)) + self->x;
+			if (*v != ',') {
+				return 1;
+			}
+			v++;
+			ext->path[i].y = to_fixed(strtol(v, &v, 0)) + self->y;
+			if (*v != ' ' && *v != 0) {
+				return 1;
+			}
+			v++;
+		}
+		free(vv);
+		self->x = ext->path[0].x;
+		self->y = ext->path[0].y;
+	} else {
+		return 1;
+	}
+	return 0;
+}
diff --git a/src/funsinit.c b/src/funsinit.c
index 264a653..8e5581a 100644
--- a/src/funsinit.c
+++ b/src/funsinit.c
@@ -4,10 +4,14 @@
 
 void *walker_new(struct entities *entities);
 int walker_property(void *const restrict entity, char const *const restrict property, char const *const restrict value);
+void *flier_new(struct entities *entities);
+int flier_property(void *const restrict entity, char const *const restrict property, char const *const restrict value);
+
 void *warp_new(struct entities *entities);
 int warp_property(void *const restrict entity, char const *const restrict property, char const *const restrict value);
 
 void funs_init(void) {
 	res_push_fun(walker_new, walker_property, "walker");
+	res_push_fun(flier_new, flier_property, "flier");
 	res_push_fun(warp_new, warp_property, "warp");
 }
diff --git a/src/res/flier.ase b/src/res/flier.ase
new file mode 100644
index 0000000..741409a
--- /dev/null
+++ b/src/res/flier.ase
Binary files differ