Add unlockable explosive block

gamestate.c

@@ -471,11 +471,18 @@ static cpBool on_damage(cpArbiter* arb, cpSpace* space, cpDataPointer userData)
 	entity_b = cp_shape_entity(b);
 
 	float damage = V2length(cp_to_v2(cpArbiterTotalImpulse(arb))) * COLLISION_DAMAGE_SCALING;
+
+	if (entity_a->is_box && entity_a->box_type == BoxExplosive)
+		entity_a->damage += 2.0f*EXPLOSION_DAMAGE_THRESHOLD;
+	if (entity_b->is_box && entity_b->box_type == BoxExplosive)
+		entity_b->damage += 2.0f*EXPLOSION_DAMAGE_THRESHOLD;
+
 	if (damage > 0.05f)
 	{
 		// Log("Collision with damage %f\n", damage);
 		entity_a->damage += damage;
 		entity_b->damage += damage;
+
 	}
 
 	// b must be the key passed into the post step removed, the key is cast into its shape
@@ -515,12 +522,6 @@ V2 grid_com(Entity* grid)
 	return cp_to_v2(cpBodyLocalToWorld(grid->body, cpBodyGetCenterOfGravity(grid->body)));
 }
 
-V2 entity_pos(Entity* e)
-{
-	assert(!e->is_box);
-	// @Robust merge entity_pos with box_pos
-	return cp_to_v2(cpBodyGetPosition(e->body));
-}
 V2 grid_vel(Entity* grid)
 {
 	return cp_to_v2(cpBodyGetVelocity(grid->body));
@@ -568,15 +569,20 @@ float entity_shape_mass(Entity* box)
 	assert(box->shape != NULL);
 	return (float)cpShapeGetMass(box->shape);
 }
-V2 box_pos(Entity* box)
-{
-	assert(box->is_box);
-	return V2add(entity_pos(box_grid(box)), V2rotate(entity_shape_pos(box), entity_rotation(box_grid(box))));
-}
 float box_rotation(Entity* box)
 {
 	return (float)cpBodyGetAngle(cpShapeGetBody(box->shape));
 }
+V2 entity_pos(Entity* e)
+{
+	if (e->is_box) {
+		return V2add(entity_pos(box_grid(e)), V2rotate(entity_shape_pos(e), entity_rotation(box_grid(e))));
+	}
+	else {
+		assert(e->body != NULL);
+		return cp_to_v2(cpBodyGetPosition(e->body));
+	}
+}
 
 struct BodyData
 {
@@ -711,6 +717,7 @@ void ser_player(SerState* ser, Player* p)
 	SER_VAR(&p->connected);
 	if (p->connected)
 	{
+		SER_VAR(&p->unlocked_bombs);
 		ser_entityid(ser, &p->entity);
 		ser_inputframe(ser, &p->input);
 	}
@@ -779,6 +786,14 @@ void ser_entity(SerState* ser, GameState* gs, Entity* e)
 		SER_VAR(&e->goldness);
 	}
 
+	SER_VAR(&e->is_explosion);
+	if (e->is_explosion)
+	{
+		ser_V2(ser, &e->explosion_pos);
+		ser_V2(ser, &e->explosion_vel);
+		SER_VAR(&e->explosion_progresss);
+	}
+
 	SER_VAR(&e->is_grid);
 	if (e->is_grid)
 	{
@@ -955,6 +970,34 @@ Entity* closest_to_point_in_radius(GameState* gs, V2 point, float radius)
 	return NULL;
 }
 
+static float cur_explosion_damage = 0.0f;
+static V2 explosion_origin = { 0 };
+static void explosion_callback_func(cpShape* shape, cpContactPointSet* points, void* data)
+{
+	GameState* gs = (GameState*)data;
+	cp_shape_entity(shape)->damage += cur_explosion_damage;
+	Entity* parent = get_entity(gs, cp_shape_entity(shape)->shape_parent_entity);
+	V2 from_pos = entity_pos(cp_shape_entity(shape));
+	V2 impulse = V2scale(V2normalize(V2sub(from_pos, explosion_origin)), EXPLOSION_PUSH_STRENGTH);
+	assert(parent->body != NULL);
+	cpBodyApplyImpulseAtWorldPoint(parent->body, v2_to_cp(impulse), v2_to_cp(from_pos));
+
+}
+
+static void do_explosion(GameState* gs, Entity* explosion, float dt)
+{
+	cur_explosion_damage = dt * EXPLOSION_DAMAGE_PER_SEC;
+	explosion_origin = explosion->explosion_pos;
+
+	cpBody* tmpbody = cpBodyNew(0.0f, 0.0f);
+	cpShape* circle = cpCircleShapeNew(tmpbody, EXPLOSION_RADIUS, v2_to_cp(explosion_origin));
+
+	cpSpaceShapeQuery(gs->space, circle, explosion_callback_func, (void*)gs);
+
+	cpShapeFree(circle);
+	cpBodyFree(tmpbody);
+}
+
 V2 box_facing_vector(Entity* box)
 {
 	assert(box->is_box);
@@ -1029,7 +1072,7 @@ void process(GameState* gs, float dt)
 		assert(p->is_player);
 
 #ifdef INFINITE_RESOURCES
-		p->spice_taken_away = 0.0f;
+		p->damage = 0.0f;
 #endif
 		// update gold win condition
 		if (V2length(V2sub(cp_to_v2(cpBodyGetPosition(p->body)), gs->goldpos)) < GOLD_COLLECT_RADIUS)
@@ -1066,7 +1109,7 @@ void process(GameState* gs, float dt)
 			}
 			else
 			{
-				V2 pilot_seat_exit_spot = V2add(box_pos(the_seat), V2scale(box_facing_vector(the_seat), BOX_SIZE));
+				V2 pilot_seat_exit_spot = V2add(entity_pos(the_seat), V2scale(box_facing_vector(the_seat), BOX_SIZE));
 				cpBodySetPosition(p->body, v2_to_cp(pilot_seat_exit_spot));
 				cpBodySetVelocity(p->body, v2_to_cp(player_vel(gs, p)));
 				the_seat->player_who_is_inside_of_me = (EntityID){ 0 };
@@ -1095,7 +1138,7 @@ void process(GameState* gs, float dt)
 			{
 				assert(seat_inside_of->is_box);
 				cpShapeSetFilter(p->shape, CP_SHAPE_FILTER_NONE); // no collisions while in a seat
-				cpBodySetPosition(p->body, v2_to_cp(box_pos(seat_inside_of)));
+				cpBodySetPosition(p->body, v2_to_cp(entity_pos(seat_inside_of)));
 
 				// set thruster thrust from movement
 				if (seat_inside_of->box_type == BoxCockpit) {
@@ -1194,8 +1237,27 @@ void process(GameState* gs, float dt)
 			cpBodyUpdateVelocity(e->body, g, 1.0f, dt);
 		}
 
+		if (e->is_explosion)
+		{
+			e->explosion_progresss += dt;
+			e->explosion_pos = V2add(e->explosion_pos, V2scale(e->explosion_vel, dt));
+			do_explosion(gs, e, dt);
+			if (e->explosion_progresss >= EXPLOSION_TIME)
+			{
+				entity_destroy(gs, e);
+			}
+		}
+
 		if (e->is_box)
 		{
+			if (e->box_type == BoxExplosive && e->damage >= EXPLOSION_DAMAGE_THRESHOLD)
+			{
+				Entity* explosion = new_entity(gs);
+				explosion->is_explosion = true;
+				explosion->explosion_pos = entity_pos(e);
+				explosion->explosion_vel = grid_vel(box_grid(e));
+				grid_remove_box(gs, get_entity(gs, e->shape_parent_entity), e);
+			}
 			if (e->damage >= 1.0f)
 			{
 				grid_remove_box(gs, get_entity(gs, e->shape_parent_entity), e);
@@ -1208,7 +1270,7 @@ void process(GameState* gs, float dt)
 			BOXES_ITER(gs, cur, e)
 			{
 				if (cur->box_type == BoxSolarPanel) {
-					cur->sun_amount = clamp01(V2dot(box_facing_vector(cur), V2normalize(V2sub(SUN_POS, box_pos(cur)))));
+					cur->sun_amount = clamp01(V2dot(box_facing_vector(cur), V2normalize(V2sub(SUN_POS, entity_pos(cur)))));
 					energy_to_add += cur->sun_amount * SOLAR_ENERGY_PER_SECOND * dt;
 				}
 			}
@@ -1237,7 +1299,7 @@ void process(GameState* gs, float dt)
 					if (possibly_use_energy(gs, e, energy_to_consume))
 					{
 						cur->thrust = cur->wanted_thrust;
-						cpBodyApplyForceAtWorldPoint(e->body, v2_to_cp(thruster_force(cur)), v2_to_cp(box_pos(cur)));
+						cpBodyApplyForceAtWorldPoint(e->body, v2_to_cp(thruster_force(cur)), v2_to_cp(entity_pos(cur)));
 					}
 				}
 				if (cur->box_type == BoxMedbay)

main.c

@@ -54,6 +54,8 @@ static sg_image image_stars;
 static sg_image image_stars2;
 static sg_image image_sun;
 static sg_image image_medbay_used;
+static sg_image image_mystery;
+static sg_image image_explosion;
 static int cur_editing_boxtype = -1;
 static int cur_editing_rotation = 0;
 
@@ -61,6 +63,7 @@ static struct BoxInfo {
 	enum BoxType type;
 	const char* image_path;
 	sg_image image;
+	bool needs_tobe_unlocked;
 } boxes[] = {
 	// if added to here will show up in toolbar, is placeable
 	{
@@ -75,10 +78,6 @@ static struct BoxInfo {
 		.type = BoxBattery,
 		.image_path = "loaded/battery.png",
 	},
-	{
-		.type = BoxSolarPanel,
-		.image_path = "loaded/solarpanel.png",
-	},
 	{
 		.type = BoxCockpit,
 		.image_path = "loaded/cockpit.png",
@@ -87,6 +86,15 @@ static struct BoxInfo {
 		.type = BoxMedbay,
 		.image_path = "loaded/medbay.png",
 	},
+	{
+		.type = BoxSolarPanel,
+		.image_path = "loaded/solarpanel.png",
+	},
+	{
+		.type = BoxExplosive,
+		.image_path = "loaded/explosive.png",
+		.needs_tobe_unlocked = true,
+	},
 };
 const int boxes_len = sizeof(boxes) / sizeof(*boxes);
 
@@ -171,6 +179,8 @@ init(void)
 		image_stars2 = load_image("loaded/stars2.png");
 		image_sun = load_image("loaded/sun.png");
 		image_medbay_used = load_image("loaded/medbay_used.png");
+		image_mystery = load_image("loaded/mystery.png");
+		image_explosion = load_image("loaded/explosion.png");
 	}
 
 	// socket initialization
@@ -273,6 +283,22 @@ myentity()
 	return to_return;
 }
 
+bool can_build(int i)
+{
+	bool allow_building = true;
+	if (boxinfo((enum BoxType)i).needs_tobe_unlocked)
+	{
+		allow_building = gs.players[myplayer].unlocked_bombs;
+	}
+	return allow_building;
+}
+
+void attempt_to_build(int i)
+{
+	if (can_build(i))
+		cur_editing_boxtype = i;
+}
+
 static void
 ui(bool draw, float dt, float width, float height)
 {
@@ -326,8 +352,8 @@ ui(bool draw, float dt, float width, float height)
 				mouse_pos)
 				&& mouse_pressed) {
 				// "handle" mouse pressed
+				attempt_to_build(i);
 				mouse_pressed = false;
-				cur_editing_boxtype = i;
 			}
 
 			if (draw) {
@@ -339,7 +365,14 @@ ui(bool draw, float dt, float width, float height)
 					sgp_set_image(0, image_itemframe);
 				}
 				sgp_draw_textured_rect(x, y, itemframe_width, itemframe_height);
-				sgp_set_image(0, boxinfo((enum BoxType)i).image);
+				struct BoxInfo info = boxinfo((enum BoxType)i);
+				if (can_build(i))
+				{
+					sgp_set_image(0, info.image);
+				}
+				else {
+					sgp_set_image(0, image_mystery);
+				}
 				transform_scope
 				{
 					float item_x = x + item_offset_x;
@@ -706,8 +739,8 @@ frame(void)
 																			{
 																				if (b->type == BoxThruster)
 																				{
-																					dbg_rect(box_pos(b));
-																					dbg_line(box_pos(b), V2add(box_pos(b), V2scale(thruster_force(b), -1.0f)));
+																					dbg_rect(entity_pos(b));
+																					dbg_line(entity_pos(b), V2add(entity_pos(b), V2scale(thruster_force(b), -1.0f)));
 																				}
 																			}
 							#endif
@@ -721,8 +754,8 @@ frame(void)
 								transform_scope
 								{
 									sgp_rotate_at(entity_rotation(g) + rotangle(b->compass_rotation),
-										box_pos(b).x,
-										box_pos(b).y);
+										entity_pos(b).x,
+										entity_pos(b).y);
 
 									if (b->box_type == BoxThruster) {
 										transform_scope
@@ -735,8 +768,8 @@ frame(void)
 											// float scaling = 1.1;
 											// sgp_translate(-(scaling*BOX_SIZE - BOX_SIZE), 0.0);
 											// sgp_scale(scaling, 1.0);
-											sgp_scale_at(scaling, 1.0f, box_pos(b).x, box_pos(b).y);
-											draw_texture_centered(box_pos(b), BOX_SIZE);
+											sgp_scale_at(scaling, 1.0f, entity_pos(b).x, entity_pos(b).y);
+											draw_texture_centered(entity_pos(b), BOX_SIZE);
 											sgp_reset_image(0);
 										}
 									}
@@ -752,7 +785,7 @@ frame(void)
 											img = image_medbay_used;
 									}
 									sgp_set_image(0, img);
-									draw_texture_centered(box_pos(b), BOX_SIZE);
+									draw_texture_centered(entity_pos(b), BOX_SIZE);
 									sgp_reset_image(0);
 
 									if (b->box_type == BoxSolarPanel)
@@ -760,11 +793,11 @@ frame(void)
 										Color to_set = colhexcode(0xeb9834);
 										to_set.a = b->sun_amount * 0.5f;
 										set_color(to_set);
-										draw_color_rect_centered(box_pos(b), BOX_SIZE);
+										draw_color_rect_centered(entity_pos(b), BOX_SIZE);
 									}
 
 									sgp_set_color(0.5f, 0.1f, 0.1f, b->damage);
-									draw_color_rect_centered(box_pos(b), BOX_SIZE);
+									draw_color_rect_centered(entity_pos(b), BOX_SIZE);
 								}
 						}
 
@@ -784,7 +817,15 @@ frame(void)
 							sgp_reset_image(0);
 						}
 					}
+					if (e->is_explosion)
+					{
+						sgp_set_image(0, image_explosion);
+						sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f - (e->explosion_progresss / EXPLOSION_TIME));
+						draw_texture_centered(e->explosion_pos, EXPLOSION_RADIUS*2.0f);
+						sgp_reset_image(0);
+					}
 				}
+
 				// gold target
 				set_color(GOLD);
 				sgp_draw_filled_rect(gs.goldpos.x, gs.goldpos.y, 0.1f, 0.1f);
@@ -843,7 +884,7 @@ void event(const sapp_event* e)
 		int key_num = e->key_code - SAPP_KEYCODE_0;
 		int target_box = key_num - 1;
 		if (target_box < BoxLast) {
-			cur_editing_boxtype = target_box;
+			attempt_to_build(target_box);
 		}
 
 		if (!mouse_frozen) {

server.c

@@ -21,6 +21,11 @@ void server(void* data)
 	initialize(&gs, entity_data, entities_size);
 	Log("Allocated %zu bytes for entities\n", entities_size);
 
+	// unlock the explosive
+	if (true)
+	{
+	}
+
 	// one box policy
 	if (false)
 	{
@@ -122,6 +127,9 @@ void server(void* data)
 						event.peer->data = (void*)player_slot;
 						gs.players[player_slot] = (struct Player){ 0 };
 						gs.players[player_slot].connected = true;
+#ifdef UNLOCK_ALL
+						gs.players[player_slot].unlocked_bombs = true;
+#endif
 					}
 
 					break;

types.h

@@ -6,13 +6,12 @@
 #define PLAYER_SIZE ((V2){.x = BOX_SIZE, .y = BOX_SIZE})
 #define PLAYER_MASS 0.5f
 #define PLAYER_JETPACK_FORCE 2.0f
-//#define PLAYER_JETPACK_SPICE_PER_SECOND 0.3f
-#define PLAYER_JETPACK_SPICE_PER_SECOND 0.0f
+#define PLAYER_JETPACK_SPICE_PER_SECOND 0.3f
 #define MAX_HAND_REACH 1.0f
 #define GOLD_COLLECT_RADIUS 0.3f
 #define BUILD_BOX_SNAP_DIST_TO_SHIP 0.2f
 #define BOX_MASS 1.0f
-#define COLLISION_DAMAGE_SCALING 0.1f
+#define COLLISION_DAMAGE_SCALING 0.15f
 #define THRUSTER_FORCE 4.0f
 #define THRUSTER_ENERGY_USED_PER_SECOND 0.05f
 #define VISION_RADIUS 16.0f
@@ -25,6 +24,11 @@
 #define DAMAGE_TO_PLAYER_PER_BLOCK 0.1f
 #define BATTERY_CAPACITY DAMAGE_TO_PLAYER_PER_BLOCK
 #define PLAYER_ENERGY_RECHARGE_PER_SECOND 0.1f
+#define EXPLOSION_TIME 0.5f
+#define EXPLOSION_PUSH_STRENGTH 5.0f
+#define EXPLOSION_DAMAGE_PER_SEC 10.0f
+#define EXPLOSION_RADIUS 1.0f
+#define EXPLOSION_DAMAGE_THRESHOLD 0.2f // how much damage until it explodes
 
 #define TIMESTEP (1.0f / 60.0f) // not required to simulate at this, but this defines what tick the game is on
 #define TIME_BETWEEN_INPUT_PACKETS (1.0f / 20.0f)
@@ -86,6 +90,7 @@ enum BoxType
 	BoxCockpit,
 	BoxMedbay,
 	BoxSolarPanel,
+	BoxExplosive,
 	BoxLast,
 };
 
@@ -150,6 +155,12 @@ typedef struct Entity
 	EntityID currently_inside_of_box;
 	float goldness;         // how much the player is a winner
 
+	// explosion
+	bool is_explosion;
+	V2 explosion_pos;
+	V2 explosion_vel;
+	float explosion_progresss; // in seconds
+
 	// grids
 	bool is_grid;
 	float total_energy_capacity;
@@ -171,6 +182,7 @@ typedef struct Entity
 typedef struct Player
 {
 	bool connected;
+	bool unlocked_bombs;
 	EntityID entity;
 	InputFrame input;
 } Player;
@@ -269,7 +281,6 @@ V2 grid_world_to_local(Entity* grid, V2 world);
 V2 grid_snapped_box_pos(Entity* grid, V2 world); // returns the snapped pos in world coords
 float entity_angular_velocity(Entity* grid);
 V2 entity_shape_pos(Entity* box);
-V2 box_pos(Entity* box); // returns in world coords
 float box_rotation(Entity* box);
 
 // thruster