gremlin/src/main.cpp

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

#include <enet/enet.h>
#include <GL/glfw.h>

#include "common.h"
#include "game.h"
#include "Explosion.h"

GLUquadricObj *quadratic;
ENetHost *host;
ENetPeer *client_peer;
player_t *local_player;
Explosion explosion;

void key_callback(int key, int state) {

}

void setup_opengl() {
	// Initialise GLFW
	if (!glfwInit()) {
		fprintf(stderr, "Failed to initialize GLFW\n");
		exit(EXIT_FAILURE);
	}

	// Open OpenGL window
	if (!glfwOpenWindow(640, 480, 0, 0, 0, 0, 0, 0, GLFW_WINDOW)) {
		fprintf(stderr, "Failed to open GLFW window\n");
		glfwTerminate();
		exit(EXIT_FAILURE);
	}
	//glfwDisable(GLFW_MOUSE_CURSOR);
	glfwSetWindowTitle("Gremlin Lan Party Game");
	glfwSetKeyCallback(key_callback);
	// Enable sticky keys
	glfwEnable(GLFW_STICKY_KEYS);

	// general settings
	glShadeModel( GL_SMOOTH);
	glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
	glEnable( GL_CULL_FACE);

	// setup depth buffer
	glClearDepth(1.0f);
	glEnable( GL_DEPTH_TEST);
	glDepthFunc( GL_LEQUAL);

	GLfloat LightAmbient[] = { 0.1f, 0.1f, 0.1f, 1.0f };
	GLfloat LightDiffuse[] = { 1.0f, 1.0f, 1.0f, 1.0f };
	GLfloat LightPosition[] = { 0.0f, 0.0f, 2.0f, 1.0f };

	// setup directional light
	glLightfv(GL_LIGHT1, GL_AMBIENT, LightAmbient);
	glLightfv(GL_LIGHT1, GL_DIFFUSE, LightDiffuse);
	glLightfv(GL_LIGHT1, GL_POSITION, LightPosition);
	glEnable( GL_LIGHT1);
	glEnable( GL_LIGHTING);

	// Enable vertical sync (on cards that support it)
	glfwSwapInterval(1);
}

void draw_team(team_t *team) {
	size_t i = 0;
	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, team->color);
	glMatrixMode( GL_MODELVIEW);
	glPushMatrix();
	glTranslated(team->x, team->y, team->z);
	gluSphere(quadratic, 50.f, 32, 32);
	glPopMatrix();
}

void draw_player(player_t *player) {
	if (player->status == 0)
		return;
	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, player->team->color);
	glMatrixMode( GL_MODELVIEW);
	glPushMatrix();
	glTranslated(player->x, player->y, player->z);
	gluSphere(quadratic, 10.f, 32, 32);
	glPopMatrix();
}

void draw_bomb(bomb_t *bomb) {
	if (bomb->status != 1)
		return;
	GLfloat red[] = { 1.0f, 0.0f, 0.0f, 1.0f };
	glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, red);
	glMatrixMode( GL_MODELVIEW);
	glPushMatrix();
	glTranslated(bomb->x, bomb->y, bomb->z);
	gluSphere(quadratic, 3.f, 32, 32);
	glPopMatrix();
}

void setup_network(const char *remote) {
	if (enet_initialize() != 0) {
		fprintf(stderr, "An error occurred while initializing ENet.\n");
		exit(EXIT_FAILURE);
	}

	if (remote == NULL) {
		ENetAddress address;

		address.host = ENET_HOST_ANY;
		address.port = 1234;

		host = enet_host_create(&address, 32, 2, 0, 0);
		if (host == NULL) {
			fprintf(stderr,
					"An error occurred while trying to create an ENet server host.\n");
			exit(EXIT_FAILURE);
		}
	} else {
		ENetAddress address;
		ENetEvent event;

		host = enet_host_create(NULL, 1, 2, 57600 / 8, 14400 / 8);
		if (host == NULL) {
			fprintf(stderr,
					"An error occurred while trying to create an ENet client host.\n");
			exit(EXIT_FAILURE);
		}

		enet_address_set_host(&address, remote);
		address.port = 1234;

		/* Initiate the connection, allocating the two channels 0 and 1. */
		client_peer = enet_host_connect(host, &address, 2, 0);

		if (client_peer == NULL) {
			fprintf(stderr,
					"No available peers for initiating an ENet connection.\n");
			exit(EXIT_FAILURE);
		}

		/* Wait up to 5 seconds for the connection attempt to succeed. */
		if (enet_host_service(host, &event, 5000) > 0 && event.type
				== ENET_EVENT_TYPE_CONNECT) {
			puts("Connection succeeded.");
		} else {
			/* Either the 5 seconds are up or a disconnect event was */
			/* received. Reset the peer in the event the 5 seconds   */
			/* had run out without any significant event.            */
			enet_peer_reset(client_peer);

			fprintf(stderr, "Connection to %s failed.", remote);
		}
	}

}

#define MESSAGE_PLAYER_SPAWN 0
#define MESSAGE_PLAYER_KILL 1
#define MESSAGE_ACCEPT 2
#define MESSAGE_PLAYER_UPDATE 3
#define MESSAGE_PLAYER_ACCELERATE 4
#define MESSAGE_BOMB_DROP 5
#define MESSAGE_BOMB_UPDATE 6

typedef struct message_t {
	uint16_t msg_id;
} message_t;

typedef struct player_spawn_message_t {
	uint16_t msg_id;
	uint8_t team_id;
	uint16_t player_id;
} player_spawn_message_t;

typedef struct player_kill_message_t {
	uint16_t msg_id;
	uint16_t player_id;
} player_kill_message_t;

typedef struct accept_message_t {
	uint16_t msg_id;
	uint16_t player_id;
} accept_message_t;

typedef struct player_update_message_t {
	uint16_t msg_id;
	uint16_t player_id;
	unsigned int session;
	double x, y, z;
	double vx, vy, vz;
} player_update_message_t;

typedef struct player_accelerate_message_t {
	uint16_t msg_id;
	uint16_t player_id;
	double x, y, z;
} player_accelerate_message_t;

typedef struct bomb_drop_meesage_t {
	uint16_t msg_id;
	double x, y, z;
	double vx, vy, vz;
	double ttl;
} bomb_drop_meesage_t;

typedef struct bomb_update_meesage_t {
	uint16_t msg_id;
	uint16_t bomb_index;
	double x, y, z;
	double vx, vy, vz;
	double ttl;
} bomb_update_meesage_t;

void send_player_updates(game_t *game) {
	size_t i;
	for (i = 0; i < GAME_PLAYER_COUNT; i++) {
		if (game->player[i].status == 0)
			continue;
		player_update_message_t msg;
		msg.msg_id = MESSAGE_PLAYER_UPDATE;
		msg.player_id = game->player[i].id;
		msg.x = game->player[i].x;
		msg.y = game->player[i].y;
		msg.z = game->player[i].z;
		msg.vx = game->player[i].vx;
		msg.vy = game->player[i].vy;
		msg.vz = game->player[i].vz;
		ENetPacket * packet = enet_packet_create(&msg, sizeof(msg), 0);
		enet_host_broadcast(host, 0, packet);
	}
}

void dispatch_message(enet_uint8 *data, size_t length, game_t *game) {
	message_t *msg = (message_t *) data;
	switch (msg->msg_id) {
	case MESSAGE_PLAYER_SPAWN: {
		player_spawn_message_t *sm = (player_spawn_message_t *) data;
		team_t *team = game_team(game, sm->team_id);
		player_t *player = game_spawn_player_id(game, team, sm->player_id);
		break;
	}
	case MESSAGE_PLAYER_KILL: {
		player_kill_message_t *sm = (player_kill_message_t *) data;
		player_t *player = game_player(game, sm->player_id);
		player->status = 0;
		player->team = 0;
		break;
	}
	case MESSAGE_ACCEPT: {
		accept_message_t *am = (accept_message_t *) data;
		local_player = game_player(game, am->player_id);
		printf("Spwan as %d.%d\n", local_player->team->id, local_player->id);
		break;
	}
	case MESSAGE_PLAYER_UPDATE: {
		player_update_message_t *um = (player_update_message_t *) data;
		player_t *player = game_player(game, um->player_id);
		player->x = um->x;
		player->y = um->y;
		player->z = um->z;
		player->vx = um->vx;
		player->vy = um->vy;
		player->vz = um->vz;
		break;
	}
	case MESSAGE_PLAYER_ACCELERATE: {
		player_accelerate_message_t *um = (player_accelerate_message_t *) data;
		player_t *player = game_player(game, um->player_id);
		player->vx += um->x;
		player->vy += um->y;
		player->vz += um->z;
		break;
	}
	case MESSAGE_BOMB_DROP: {
		bomb_drop_meesage_t *m = (bomb_drop_meesage_t *) data;
		bomb_t *bomb = game_spawn_bomb(game);
		if (bomb == NULL)
			return;
		bomb->x = m->x;
		bomb->y = m->y;
		bomb->z = m->z;
		bomb->vx = m->vx;
		bomb->vy = m->vy;
		bomb->vz = m->vz;
		bomb->ttl = m->ttl;
		if (client_peer == NULL) {
			ENetPacket * packet = enet_packet_create(data, length,
					ENET_PACKET_FLAG_RELIABLE);
			enet_host_broadcast(host, 0, packet);
		}
		break;
	}
	};
}
void service_network(game_t *game) {
	ENetEvent event;

	/* Wait up to 1000 milliseconds for an event. */
	while (enet_host_service(host, &event, 0) > 0) {
		switch (event.type) {
		case ENET_EVENT_TYPE_CONNECT:
			printf("A new client connected from %x:%u.\n",
					event.peer->address.host, event.peer->address.port);
			{
				// bring new client up to date
				size_t i;
				for (i = 0; i < GAME_PLAYER_COUNT; i++) {
					if (game->player[i].status == 0)
						continue;
					// send player spawn message
					player_spawn_message_t spwan_msg;
					spwan_msg.msg_id = MESSAGE_PLAYER_SPAWN;
					spwan_msg.team_id = game->player[i].team->id;
					spwan_msg.player_id = game->player[i].id;
					ENetPacket * packet = enet_packet_create(&spwan_msg,
							sizeof(spwan_msg), ENET_PACKET_FLAG_RELIABLE);
					enet_peer_send(event.peer, 0, packet);
				}

				team_t *team = game_team_with_least_players(game);
				player_t *player = game_spawn_player(game, team);
				printf("Spwan as %d.%d\n", team->id, player->id);
				event.peer->data = player;

				// send player spawn message
				player_spawn_message_t spwan_msg;
				spwan_msg.msg_id = MESSAGE_PLAYER_SPAWN;
				spwan_msg.team_id = team->id;
				spwan_msg.player_id = player->id;
				ENetPacket * packet = enet_packet_create(&spwan_msg,
						sizeof(spwan_msg), ENET_PACKET_FLAG_RELIABLE);
				enet_host_broadcast(host, 0, packet);

				// send team and player
				accept_message_t msg;
				msg.msg_id = MESSAGE_ACCEPT;
				msg.player_id = player->id;
				packet = enet_packet_create(&msg, sizeof(msg),
						ENET_PACKET_FLAG_RELIABLE);
				enet_peer_send(event.peer, 0, packet);

				// send state
			}
			break;

		case ENET_EVENT_TYPE_RECEIVE: {
			dispatch_message(event.packet->data, event.packet->dataLength, game);
			enet_packet_destroy(event.packet);
			break;
		}
		case ENET_EVENT_TYPE_DISCONNECT:
			printf("%s disconected.\n", event.peer -> data);
			{
				/* Reset the peer's client information. */
				player_t *player = (player_t *) event.peer->data;
				player->status = 0;
				player->team = 0;

				// send player spawn message
				player_kill_message_t msg;
				msg.msg_id = MESSAGE_PLAYER_KILL;
				msg.player_id = player->id;
				ENetPacket * packet = enet_packet_create(&msg, sizeof(msg),
						ENET_PACKET_FLAG_RELIABLE);
				enet_host_broadcast(host, 0, packet);
			}
			event.peer->data = NULL;
			break;
		}
	}

}

void accelerate(game_t *game, double x, double y, double z) {
	player_accelerate_message_t msg;
	msg.msg_id = MESSAGE_PLAYER_ACCELERATE;
	msg.player_id = local_player->id;
	msg.x = x;
	msg.y = y;
	msg.z = z;
	if (client_peer) {
		ENetPacket * packet = enet_packet_create(&msg, sizeof(msg),
				ENET_PACKET_FLAG_RELIABLE);
		enet_peer_send(client_peer, 0, packet);
	} else {
		dispatch_message((uint8_t*) &msg, sizeof(msg), game);
	}
}

void drop_bomb(game_t *game, double x, double y, double z, double ttl) {
	bomb_drop_meesage_t msg;
	msg.msg_id = MESSAGE_BOMB_DROP;
	msg.x = x;
	msg.y = y;
	msg.z = z;
	msg.vx = local_player->vx;
	msg.vy = local_player->vy;
	msg.vz = local_player->vz;
	msg.ttl = ttl;
	if (client_peer) {
		ENetPacket * packet = enet_packet_create(&msg, sizeof(msg),
				ENET_PACKET_FLAG_RELIABLE);
		enet_peer_send(client_peer, 0, packet);
	} else {
		dispatch_message((uint8_t*) &msg, sizeof(msg), game);
	}
}

void setup_explosion() {

	// Loads particle texture
	GLuint textures[5];

	glGenTextures(5, textures);

	glBindTexture(GL_TEXTURE_2D, textures[0]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glfwLoadTexture2D("data/explosion/explosion.tga", GLFW_ALPHA_MAP_BIT);

	glBindTexture(GL_TEXTURE_2D, textures[1]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glfwLoadTexture2D("data/explosion/flash.tga", 0);

	glBindTexture(GL_TEXTURE_2D, textures[2]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glfwLoadTexture2D("data/explosion/spark.tga", 0);

	glBindTexture(GL_TEXTURE_2D, textures[3]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glfwLoadTexture2D("data/explosion/point.tga", GLFW_ALPHA_MAP_BIT);

	glBindTexture(GL_TEXTURE_2D, textures[4]);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
	glfwLoadTexture2D("data/explosion/wave.tga", 0);

	explosion.initialize(textures[0], textures[1], textures[2], textures[3],
			textures[4]);
}

void explosion_callback(double x, double y, double z) {
	explosion.add(x, y, z);
}

int main(int argc, char ** argv) {
	int width, height, x, y, last_x, last_y;
	double time, last_time, phi = 0.0, theta = 0.0, last_player_update,
			last_bomb;
	GLboolean running;
	int server = 0;

	quadratic = gluNewQuadric();
	gluQuadricNormals(quadratic, GLU_SMOOTH);
	gluQuadricTexture(quadratic, GL_TRUE);

	game_t game;

	game_setup(&game);

	setup_opengl();

	setup_explosion();

	if (argc > 1) {
		server = 0;
		setup_network(argv[1]);
	} else {
		server = 1;
		setup_network(NULL);
		team_t *team = game_team(&game, 0);
		local_player = game_spawn_player(&game, team);
	}
	float plane_color[] = { 0.2f, 0.3f, 0.4f, 1.0f };
	size_t i;
	running = GL_TRUE;
	last_time = glfwGetTime();
	last_player_update = last_time;
	last_bomb = last_time;
	double camX, camY, camZ;
	glfwGetMousePos(&last_x, &last_y);
	while (running) {
		// Get time and mouse position
		time = glfwGetTime();
		double dt = time - last_time;
		glfwGetMousePos(&x, &y);
		if (glfwGetMouseButton(GLFW_MOUSE_BUTTON_2) == GLFW_PRESS) {
			phi += (x - last_x) * 0.01;
			theta += (y - last_y) * -0.01;
			if (theta > 1.5)
				theta = 1.5;
			if (theta < -1.5)
				theta = -1.5;
		}
		last_x = x;
		last_y = y;

		if (local_player) {
			camX = local_player->x;
			camY = local_player->y;
			camZ = local_player->z;
		} else {
			camX = 1000.0;
			camY = 1000.0;
			camZ = 1000.0;
		}

		double rx = cos(phi) * cos(theta);
		double ry = sin(theta);
		double rz = sin(phi) * cos(theta);
		double v = 50.0f * dt;
		if (glfwGetKey('W')) {
			accelerate(&game, rx * v, ry * v, rz * v);
		} else if (glfwGetKey('S')) {
			accelerate(&game, rx * -v, ry * -v, rz * -v);
		}

		if (glfwGetKey('A')) {
			accelerate(&game, rz * v, 0, -rx * v);
		} else if (glfwGetKey('D')) {
			accelerate(&game, -rz * v, 0, rx * v);
		}

		if (glfwGetKey(GLFW_KEY_SPACE)) {
			accelerate(&game, local_player->vx * -dt, local_player->vy * -dt,
					local_player->vz * -dt);
		}

		if (glfwGetKey(GLFW_KEY_LCTRL)) {
			if (time - last_bomb > 5.0) {
				last_bomb = time;
				drop_bomb(&game, local_player->x + rx - 20.0, local_player->y
						+ ry * -20.0, local_player->z + rz * -20.0, 5.0);
			}
		}

		if (glfwGetKey(GLFW_KEY_ENTER)) {
			explosion.add(200.0, 200.0, 200.0);
		}

		// Get window size (may be different than the requested size)
		glfwGetWindowSize(&width, &height);
		height = height > 0 ? height : 1;

		// Set viewport
		glViewport(0, 0, width, height);

		// Clear color buffer
		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

		// Select and setup the projection matrix
		glMatrixMode( GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(60.0f, (GLfloat) width / (GLfloat) height, 1.0f,
				10000.0f);

		// Select and setup the modelview matrix
		glMatrixMode( GL_MODELVIEW);
		glLoadIdentity();
		gluLookAt(camX, camY, camZ, camX + cos(phi) * cos(theta) * 10.0f, camY
				+ sin(theta) * 10.0f, camZ + sin(phi) * cos(theta) * 10.0f, // View-point
				0.0f, 1.0f, 0.0f); // Up-vector

		service_network(&game);
		if (server) {
			if (time > last_player_update + 0.1) {
				send_player_updates(&game);
				last_player_update = time;
			}
		}

		game_update_players(&game, dt);
		game_update_bombs(&game, dt, explosion_callback);

		glEnable( GL_LIGHT0);
		glEnable( GL_LIGHTING);
		glEnable( GL_CULL_FACE);

		glMaterialfv(GL_FRONT, GL_AMBIENT_AND_DIFFUSE, plane_color);
		// Draw a textured quad
		glBegin( GL_QUADS);
		glVertex3f(-5000.0f, 5000.0f, -5000.0f);
		glVertex3f(5000.0f, 5000.0f, -5000.0f);
		glVertex3f(5000.0f, 5000.0f, 5000.0f);
		glVertex3f(-5000.0f, 5000.0f, 5000.0f);
		glEnd();
		for (i = 0; i < GAME_TEAM_COUNT; i++)
			draw_team(&game.team[i]);

		for (i = 0; i < GAME_PLAYER_COUNT; i++)
			draw_player(&game.player[i]);

		for (i = 0; i < GAME_BOMB_COUNT; i++)
			draw_bomb(&game.bomb[i]);

		glDisable(GL_LIGHT0);
		glDisable(GL_LIGHTING);
		glDisable(GL_CULL_FACE);
		explosion.update(dt * 1000.0, camX, camY, camZ);
		explosion.render();

		// Swap buffers
		glfwSwapBuffers();

		// Check if the ESC key was pressed or the window was closed
		running = !glfwGetKey(GLFW_KEY_ESC) && glfwGetWindowParam(GLFW_OPENED);

		last_time = time;
	}

	gluDeleteQuadric(quadratic);

	enet_host_destroy(host);
	enet_deinitialize();

	// Close OpenGL window and terminate GLFW
	glfwTerminate();

	return 0;
}