gremlin/src/game.cpp

#include "game.h"

#include <stdlib.h>
#include <math.h>

void game_setup_team(team_t *team, uint8_t id) {
	team->id = id;
	team->color[0] = .5f + .5f * (id & (1 << 0));
	team->color[1] = .5f + .5f * (id & (1 << 1));
	team->color[2] = .5f + .5f * (id & (1 << 2));
	team->color[3] = 1.0f;

	team->x = 2000.0 * (id & (1 << 0));
	team->y = 2000.0 * (id & (1 << 1));
	team->z = 2000.0 * (id & (1 << 2));
}

void game_setup_player(player_t *player) {
	player->id = 0;
	player->status = 0;
	player->team = NULL;
}

void game_setup(game_t *game) {
	size_t i;

	for (i = 0; i < GAME_TEAM_COUNT; i++)
		game_setup_team(&game->team[i], i);

	for (i = 0; i < GAME_PLAYER_COUNT; i++)
		game_setup_player(&game->player[i]);

	game->max_player_id = 0;
}

player_t *_game_free_player(game_t *game) {
	size_t i;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		if (game->player[i].status == 0)
			return &game->player[i];
	}
	return NULL;
}

player_t *game_spawn_player(game_t *game, team_t *team) {
	player_t *player = _game_free_player(game);
	player->team = team;
	player->id = game->max_player_id++;
	player->status = 1;
	player->x = team->x + 100;
	player->y = team->y;
	player->z = team->z;
	player->vx = 0.;
	player->vy = 0.;
	player->vz = 0.;
	return player;
}

player_t *game_spawn_player_id(game_t *game, team_t *team, uint16_t id) {
	player_t *player = _game_free_player(game);
	player->team = team;
	player->id = id;
	if (game->max_player_id < id)
		game->max_player_id = id;
	player->status = 1;
	player->x = team->x + 100;
	player->y = team->y;
	player->z = team->z;
	player->vx = 0.;
	player->vy = 0.;
	player->vz = 0.;
	return player;
}

void game_update_players(game_t *game, double dt) {
	size_t i;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		player_t *player = &game->player[i];
		if (player->status == 0)
			return;
		player->x += player->vx * dt;
		player->y += player->vy * dt;
		player->z += player->vz * dt;
	}
}

void _explode_bomb(game_t *game, bomb_t *bomb, void(*explosion_callback)(
		double x, double y, double z)) {
	size_t i;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		player_t *player = &game->player[i];
		if (player->status == 0)
			return;
		double distance2 = pow(player->x - bomb->x, 2) + pow(player->y
				- bomb->y, 2) + pow(player->z - bomb->z, 2);
		if (distance2 < 10000.0) {
			explosion_callback(player->x, player->y, player->z);
			player->x = player->team->x + 100;
			player->y = player->team->y;
			player->z = player->team->z;
			player->vx = 0.;
			player->vy = 0.;
			player->vz = 0.;
		}
	}
}

void game_update_bombs(game_t *game, double dt, void(*explosion_callback)(
		double x, double y, double z)) {
	size_t i;
	for (i = 0; i < GAME_BOMB_COUNT; i++) {
		bomb_t *bomb = &game->bomb[i];
		if (bomb->status == 0)
			return;
		bomb->x += bomb->vx * dt;
		bomb->y += bomb->vy * dt;
		bomb->z += bomb->vz * dt;
		bomb->ttl -= dt;
		if (bomb->ttl < 0) {
			if (bomb->status == 1) {
				explosion_callback(bomb->x, bomb->y, bomb->z);
				bomb->status = 2;
			} else if (bomb->ttl < 0.8) {
				_explode_bomb(game, bomb, explosion_callback);
				bomb->status = 0;
			}
		}
	}
}

size_t game_active_team_players(game_t *game, team_t *team) {
	size_t i, count = 0;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		if (game->player[i].status == 0)
			continue;
		if (game->player[i].team == team)
			count++;
	}
	return count;
}

team_t *game_team_with_least_players(game_t *game) {
	size_t i, count = -1;
	team_t *team = NULL;
	for (i = 0; i < GAME_TEAM_COUNT; i++) {
		size_t players = game_active_team_players(game, &game->team[i]);
		if (players < count) {
			count = players;
			team = &game->team[i];
		}
	}
	return team;
}

team_t *game_team(game_t *game, uint16_t id) {
	size_t i;
	for (i = 0; i < GAME_TEAM_COUNT; i++) {
		if (game->team[i].id == id) {
			return &game->team[i];
		}
	}
	return NULL;
}

player_t *game_player(game_t *game, uint16_t id) {
	size_t i;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		if (game->player[i].id == id) {
			return &game->player[i];
		}
	}
	return NULL;
}

bomb_t *game_spawn_bomb(game_t *game) {
	size_t i;
	for (i = 0; i < GAME_BOMB_COUNT; i++) {
		if (game->bomb[i].status == 0) {
			game->bomb[i].status = 1;
			return &game->bomb[i];
		}
	}
	return NULL;
}