Posted By: Scorpion
let the server do the work - 07/17/10 13:27
hello everyone,
I just tried to put my hands on the gamestudio multiplayer engine again. The last time I did that, I ended up nearly exclusively using send_data - only to get something in the direction of client side prediction working. But now I found the new 3rd value for dplay_smooth, which stops the engine predicting the players movement. So I wrote a small code, that lets you control a player with your keyboard.
The only problem is, that I give the client too much power by letting him choose the position he wants to spawn. Whats the best way to avoid that? The greatest problem I see is that you can only use some handy functions like proc_client and everything that is related to checking where the entity belongs to, when you executed that ent_create on a client - what I think is a no go...
How should I rewrite my code to conform with these conditions?
Thank you
Scorpion
Here's the code I hacked together:
I just tried to put my hands on the gamestudio multiplayer engine again. The last time I did that, I ended up nearly exclusively using send_data - only to get something in the direction of client side prediction working. But now I found the new 3rd value for dplay_smooth, which stops the engine predicting the players movement. So I wrote a small code, that lets you control a player with your keyboard.
The only problem is, that I give the client too much power by letting him choose the position he wants to spawn. Whats the best way to avoid that? The greatest problem I see is that you can only use some handy functions like proc_client and everything that is related to checking where the entity belongs to, when you executed that ent_create on a client - what I think is a no go...
How should I rewrite my code to conform with these conditions?
Thank you
Scorpion
Here's the code I hacked together:
Code:
#define rand_area(x) vector(x-2*random(x),x-2*random(x),x-2*random(x))
#define KEYS skill1
#define SPEED skill2
#define ASPEED skill3
#define KEY_FORWARD (1<<0)
#define KEY_BACKWARD (1<<1)
#define KEY_LEFT (1<<2)
#define KEY_RIGHT (1<<3)
#define KEY_SHOOT (1<<4)
#define k(x) sign(my.KEYS & (x)) //is key pressed?
//movement code for player - executed on server and client
void player_move(){
var dirX = k(KEY_FORWARD) - k(KEY_BACKWARD);
DEBUG_VAR(dirX, 30);
var dirY = k(KEY_LEFT) - k(KEY_RIGHT);
my.pan += accelerate(my.ASPEED, dirY*10, 0.7);
c_move(me, vector(accelerate(my.SPEED, dirX*10, 0.7), 0, 0), nullvector, IGNORE_PASSABLE);
}
//player action on client
void player_main_client(){
while(1){
//store keys in skill
my.KEYS = key_w *KEY_FORWARD
| key_s *KEY_BACKWARD
| key_a *KEY_LEFT
| key_d *KEY_RIGHT
| mouse_left *KEY_SHOOT;
send_skill(my.KEYS, SEND_VEC|SEND_UNRELIABLE);
player_move();
//adapt camera to new position
vec_set(camera.x, my.x);
vec_set(camera.pan, my.pan);
wait(1);
}
}
//player action on server
action player_main(){
proc_client(me, player_main_client);
while(1){
player_move();
wait(1);
}
}
int main(){
dplay_smooth = 3;//client side player-entity is not updated
while(1){
if(key_1){//server
if(!session_open("ilovecake")){
sys_exit("Couldn't create session!");
}
level_load(NULL);
break;
}
if(key_2){//client
session_connect("ilovecake", "127.0.0.1");
while(!connection) wait(1);
level_load(NULL);
randomize();
player = ent_create(SPHERE_MDL, vec_add(rand_area(50),vector(0,0,50)), player_main);
break;
}
wait(1);
}
return 0;
}
