Add gold unlock

gamestate.c

@@ -805,6 +805,7 @@ void ser_entity(SerState* ser, GameState* gs, Entity* e)
 	if (e->is_box)
 	{
 		SER_VAR(&e->box_type);
+		SER_VAR(&e->is_explosion_unlock);
 		ser_entityid(ser, &e->next_box);
 		ser_entityid(ser, &e->prev_box);
 		SER_VAR(&e->compass_rotation);
@@ -1045,6 +1046,14 @@ bool possibly_use_energy(GameState* gs, Entity* grid, float wanted_energy)
 	return false;
 }
 
+void entity_ensure_in_orbit(Entity* e)
+{
+	cpVect pos = v2_to_cp(V2sub(entity_pos(e), SUN_POS));
+	cpFloat r = cpvlength(pos);
+	cpFloat v = cpfsqrt(SUN_GRAVITY_STRENGTH / r) / r;
+	cpBodySetVelocity(e->body, cpvmult(cpvperp(pos), v));
+}
+
 void process(GameState* gs, float dt)
 {
 	assert(gs->space != NULL);
@@ -1053,21 +1062,15 @@ void process(GameState* gs, float dt)
 	gs->time += dt;
 
 	// process input
-	for (int i = 0; i < MAX_PLAYERS; i++)
+	PLAYERS_ITER(gs->players, player)
 	{
-		struct Player* player = &gs->players[i];
-		if (!player->connected)
-			continue;
 		Entity* p = get_entity(gs, player->entity);
 		if (p == NULL)
 		{
 			p = new_entity(gs);
 			create_player(gs, p);
 			player->entity = get_id(gs, p);
-			cpVect pos = v2_to_cp(V2sub(entity_pos(p), SUN_POS));
-			cpFloat r = cpvlength(pos);
-			cpFloat v = cpfsqrt(SUN_GRAVITY_STRENGTH / r) / r;
-			cpBodySetVelocity(p->body, cpvmult(cpvperp(pos), v));
+			entity_ensure_in_orbit(p);
 		}
 		assert(p->is_player);
 
@@ -1218,6 +1221,18 @@ void process(GameState* gs, float dt)
 		if (!e->exists)
 			continue;
 
+		if (e->is_explosion_unlock)
+		{
+			PLAYERS_ITER(gs->players, player)
+			{
+				Entity* player_entity = get_entity(gs, player->entity);
+				if (player_entity != NULL && V2length(V2sub(entity_pos(player_entity), entity_pos(e))) < GOLD_UNLOCK_RADIUS)
+				{
+					player->unlocked_bombs = true;
+				}
+			}
+		}
+
 		if (e->body != NULL)
 		{
 			cpVect p = cpvsub(cpBodyGetPosition(e->body), v2_to_cp(SUN_POS));

main.c

@@ -728,11 +728,17 @@ frame(void)
 					Entity* e = &gs.entities[i];
 					if (!e->exists)
 						continue;
-					if (e->is_grid) // grid drawing
+					// draw grid
+					if (e->is_grid)
 					{
 						Entity* g = e;
 						BOXES_ITER(&gs, b, g)
 						{
+							if (b->is_explosion_unlock)
+							{
+								set_color(colhexcode(0xfcba03));
+								draw_circle(entity_pos(b), GOLD_UNLOCK_RADIUS);
+							}
 							sgp_set_color(1.0f, 1.0f, 1.0f, 1.0f);
 							// debug draw force vectors for thrusters
 							#if 0

server.c

@@ -21,9 +21,17 @@ void server(void* data)
 	initialize(&gs, entity_data, entities_size);
 	Log("Allocated %zu bytes for entities\n", entities_size);
 
-	// unlock the explosive
+#define BOX_AT(grid, pos) { Entity* box = new_entity(&gs); box_create(&gs, box, grid, pos); }
+	// space station with explosion unlock
 	if (true)
 	{
+		Entity* grid = new_entity(&gs);
+		grid_create(&gs, grid);
+		entity_set_pos(grid, (V2) { -10.0f, 0.0f });
+		entity_ensure_in_orbit(grid);
+		Entity* explosion_box = new_entity(&gs);
+		box_create(&gs, explosion_box, grid, (V2) { 0 });
+		explosion_box->is_explosion_unlock = true;
 	}
 
 	// one box policy
@@ -46,12 +54,11 @@ void server(void* data)
 		cpBodySetVelocity(grid->body, cpv(-0.1, 0.0));
 		cpBodySetAngularVelocity(grid->body, 1.0f);
 		
-#define BOX_AT(pos) { Entity* box = new_entity(&gs); box_create(&gs, box, grid, pos); }
-		BOX_AT(((V2) { 0 }));
-		BOX_AT(((V2) { BOX_SIZE, 0 }));
-		BOX_AT(((V2) { 2.0*BOX_SIZE, 0 }));
-		BOX_AT(((V2) { 2.0*BOX_SIZE, BOX_SIZE }));
-		BOX_AT(((V2) { 0.0*BOX_SIZE, -BOX_SIZE }));
+		BOX_AT(grid,((V2) { 0 }));
+		BOX_AT(grid,((V2) { BOX_SIZE, 0 }));
+		BOX_AT(grid,((V2) { 2.0*BOX_SIZE, 0 }));
+		BOX_AT(grid,((V2) { 2.0*BOX_SIZE, BOX_SIZE }));
+		BOX_AT(grid,((V2) { 0.0*BOX_SIZE, -BOX_SIZE }));
 	}
 
 	if (enet_initialize() != 0)

types.h

@@ -29,6 +29,7 @@
 #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 GOLD_UNLOCK_RADIUS 1.0f
 
 #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)
@@ -169,6 +170,7 @@ typedef struct Entity
 	// boxes
 	bool is_box;
 	enum BoxType box_type;
+	bool is_explosion_unlock;
 	EntityID next_box;
 	EntityID prev_box; // doubly linked so can remove in middle of chain
 	enum CompassRotation compass_rotation;
@@ -207,6 +209,8 @@ typedef struct GameState
 	EntityID free_list;
 } GameState;
 
+#define PLAYERS_ITER(players, cur) for(Player * cur = players; cur < players+MAX_PLAYERS; cur++) if(cur->connected)
+
 #define PI 3.14159f
 
 // returns in radians
@@ -264,6 +268,7 @@ V2 entity_pos(Entity* e);
 void entity_set_rotation(Entity* e, float rot);
 void entity_set_pos(Entity* e, V2 pos);
 float entity_rotation(Entity* e);
+void entity_ensure_in_orbit(Entity* e);
 #define BOX_CHAIN_ITER(gs, cur, starting_box) for (Entity *cur = get_entity(gs, starting_box); cur != NULL; cur = get_entity(gs, cur->next_box))
 #define BOXES_ITER(gs, cur, grid_entity_ptr) BOX_CHAIN_ITER(gs, cur, (grid_entity_ptr)->boxes)