Implement networking layer

README.md

@@ -42,7 +42,6 @@ In the abstract sense, we call the Server the game master hosting all gameplay r
 
 ## Major things to do
 * More believable world generation.
-* Networking implementation, the communication part is done, but there's currently no way to start a headless server or connect to it anyhow.
 * Improved rendering - the current world structure does not allow for layered blocks, but it's something worth looking into.
 * UI and visual effects
 

code/game/src/debug_draw.c

@@ -1,4 +1,5 @@
 #include "debug_draw.h"
+#include "game.h"
 
 static debug_draw_queue draw_queue = {0};
 
@@ -26,6 +27,7 @@ bool debug_draw_state(void) {
 
 inline void debug_push_entry(debug_draw_entry entry) {
     if (!draw_is_enabled) return;
+    if (game_get_kind() == GAMEKIND_HEADLESS) return;
     ZPL_ASSERT(draw_queue.num_entries < DEBUG_DRAW_MAX_ENTRIES);
     draw_queue.entries[draw_queue.num_entries++] = entry;
 }

code/game/src/debug_ui.c

@@ -57,6 +57,7 @@ typedef struct debug_item {
         struct {
             struct debug_item *items;
             uint8_t is_collapsed;
+            uint8_t is_sp_only;
         } list;
         
         struct {
@@ -118,7 +119,8 @@ static debug_item items[] = {
                     }
                 },
                 { .kind = DITEM_END },
-            }
+            },
+            .is_sp_only = true,
         }
     },
     {
@@ -153,7 +155,8 @@ static debug_item items[] = {
                 { .kind = DITEM_BUTTON, .name = "save as...", .on_click = ActReplaySaveAs },
                 
                 { .kind = DITEM_END },
-            }
+            },
+            .is_sp_only = true,
         }
     },
     {
@@ -209,6 +212,7 @@ debug_draw_result debug_draw_list(debug_item *list, float xpos, float ypos, bool
                 UIDrawText(it->name, xpos, ypos, DBG_FONT_SIZE, color);
                 ypos += DBG_FONT_SPACING;
                 if (it->list.is_collapsed) break;
+                if (it->list.is_sp_only && game_get_kind() != GAMEKIND_SINGLE) break;
                 debug_draw_result res = debug_draw_list(it->list.items, xpos+DBG_LIST_XPOS_OFFSET, ypos, is_shadow);
                 ypos = res.y;
             }break;

code/game/src/game.c

@@ -47,12 +47,21 @@ static WORLD_PKT_WRITER(sp_pkt_writer) {
 }
 
 static WORLD_PKT_WRITER(mp_pkt_writer) {
-    (void)udata;
     if (pkt->is_reliable) {
-        return network_msg_send(pkt->data, pkt->datalen);
+        return network_msg_send(udata, pkt->data, pkt->datalen);
     }
     else {
-        return network_msg_send_unreliable(pkt->data, pkt->datalen);
+        return network_msg_send_unreliable(udata, pkt->data, pkt->datalen);
+    }
+}
+
+static WORLD_PKT_WRITER(mp_cli_pkt_writer) {
+    (void)udata;
+    if (pkt->is_reliable) {
+        return network_msg_send(0, pkt->data, pkt->datalen);
+    }
+    else {
+        return network_msg_send_unreliable(0, pkt->data, pkt->datalen);
     }
 }
 
@@ -130,17 +139,25 @@ void game_init(game_kind play_mode, uint32_t num_viewers, int32_t seed, uint16_t
     }
     
     if (game_mode == GAMEKIND_CLIENT) {
-        world_setup_pkt_handlers(pkt_reader, mp_pkt_writer);
+        world_setup_pkt_handlers(pkt_reader, mp_cli_pkt_writer);
+#ifndef _DEBUG
+        network_client_connect("lab.zakto.pw", 27000);
+#else
         network_client_connect("127.0.0.1", 27000);
+#endif
     } else {
         stdcpp_set_os_api();
-        world_setup_pkt_handlers(pkt_reader, sp_pkt_writer);
+        world_setup_pkt_handlers(pkt_reader, game_mode == GAMEKIND_SINGLE ? sp_pkt_writer : mp_pkt_writer);
         world_init(seed, chunk_size, chunk_amount);
         if (is_dash_enabled) flecs_dash_init();
         //ecs_set_target_fps(world_ecs(), 60);
+        
+        if (game_mode == GAMEKIND_HEADLESS) {
+            network_server_start(0, 27000);
+        }
     }
     
-    if (game_mode != GAMEKIND_HEADLESS) {
+    if (game_mode == GAMEKIND_SINGLE) {
         for (uint32_t i = 0; i < num_viewers; i++) {
             pkt_00_init_send(i);
         }
@@ -157,6 +174,10 @@ void game_shutdown() {
         network_client_disconnect();
     } else {
         world_destroy();
+        
+        if (game_mode == GAMEKIND_HEADLESS) {
+            network_server_stop();
+        }
     }
     
     if (game_mode != GAMEKIND_SINGLE) {
@@ -187,7 +208,13 @@ void game_update() {
     if (game_mode == GAMEKIND_CLIENT) {
         network_client_tick();
     }
-    else world_update();
+    else {
+        world_update();
+        
+        if (game_mode == GAMEKIND_HEADLESS) {
+            network_server_tick();
+        }
+    }
     
     if (game_mode != GAMEKIND_HEADLESS) {
         game_world_cleanup_entities();

code/game/src/network.c

@@ -11,10 +11,13 @@
 #include "network.h"
 #include "packet.h"
 #include "world/world.h"
+#include "game.h"
+#include "player.h"
 
 #define NETWORK_UPDATE_DELAY 0.100
 
 static ENetHost *host = NULL;
+static ENetHost *server = NULL;
 static ENetPeer *peer = NULL;
 static librg_world *world = NULL;
 
@@ -28,6 +31,7 @@ int32_t network_destroy() {
     
 }
 
+//~ NOTE(zaklaus): client
 
 int32_t network_client_connect(const char *hostname, uint16_t port) {
     ENetAddress address = {0}; address.port = port;
@@ -44,12 +48,6 @@ int32_t network_client_connect(const char *hostname, uint16_t port) {
     world = librg_world_create();
     librg_world_userdata_set(world, peer);
     
-#if 0
-    librg_event_set(world, LIBRG_READ_CREATE, client_read_create);
-    librg_event_set(world, LIBRG_READ_UPDATE, client_read_update);
-    librg_event_set(world, LIBRG_READ_REMOVE, client_read_remove);
-#endif
-
     return 0;
 }
 
@@ -73,6 +71,7 @@ int32_t network_client_tick() {
         switch (event.type) {
             case ENET_EVENT_TYPE_CONNECT: {
                 zpl_printf("[INFO] We connected to the server.\n");
+                pkt_00_init_send(0);
             } break;
             case ENET_EVENT_TYPE_DISCONNECT:
             case ENET_EVENT_TYPE_DISCONNECT_TIMEOUT: {
@@ -80,7 +79,7 @@ int32_t network_client_tick() {
             } break;
             
             case ENET_EVENT_TYPE_RECEIVE: {
-                if (!world_read(event.packet->data, event.packet->dataLength, NULL)) {
+                if (!world_read(event.packet->data, event.packet->dataLength, event.peer)) {
                     zpl_printf("[INFO] Server sent us an unsupported packet.\n");
                 }
                 
@@ -99,15 +98,91 @@ bool network_client_is_connected() {
     return peer ? enet_peer_get_state(peer) == ENET_PEER_STATE_CONNECTED : false;
 }
 
-static int32_t network_msg_send_raw(uint16_t peer_id, void *data, size_t datalen, uint32_t flags) {
+//~ NOTE(zaklaus): server
+
+int32_t network_server_start(const char *host, uint16_t port) {
+    (void)host;
+    
+    ENetAddress address = {0};
+    
+    address.host = ENET_HOST_ANY;
+    address.port = port;
+    
+    server = enet_host_create(&address, 100, 2, 0, 0);
+    
+    if (server == NULL) {
+        zpl_printf("[ERROR] An error occured while trying to create a server host.\n");
+        return 1;
+    }
+    
+    return 0;
+}
+
+int32_t network_server_stop(void) {
+    enet_host_destroy(server);
+    server = 0;
+    return 0;
+}
+
+int32_t network_server_tick(void) {
+    ENetEvent event = {0};
+    while (enet_host_service(server, &event, 1) > 0) {
+        switch (event.type) {
+            case ENET_EVENT_TYPE_CONNECT: {
+                zpl_printf("[INFO] A new user %d connected.\n", event.peer->incomingPeerID);
+            } break;
+            case ENET_EVENT_TYPE_DISCONNECT:
+            case ENET_EVENT_TYPE_DISCONNECT_TIMEOUT: {
+                zpl_printf("[INFO] A user %d disconnected.\n", event.peer->incomingPeerID);
+                
+                if (event.peer->data) {
+                    player_despawn((ecs_entity_t)event.peer->data);
+                    event.peer->data = 0;
+                }
+            } break;
+            
+            case ENET_EVENT_TYPE_RECEIVE: {
+                if (!world_read(event.packet->data, event.packet->dataLength, event.peer)) {
+                    zpl_printf("[INFO] User %d sent us a malformed packet.\n", event.peer->incomingPeerID);
+                }
+                
+                /* Clean up the packet now that we're done using it. */
+                enet_packet_destroy(event.packet);
+            } break;
+            
+            case ENET_EVENT_TYPE_NONE: break;
+        }
+    }
+    
+    return 0;
+}
+
+void network_server_assign_entity(void *peer_id, uint64_t ent_id) {
+    ENetPeer *peer = (ENetPeer *)peer_id;
+    peer->data = (void*)ent_id;
+}
+
+uint64_t network_server_get_entity(void *peer_id) {
+    if (game_get_kind() == GAMEKIND_SINGLE) {
+        return (uint64_t)peer_id;
+    }
+    ENetPeer *peer = (ENetPeer *)peer_id;
+    ZPL_ASSERT(peer->data);
+    return (uint64_t)peer->data;
+}
+
+//~ NOTE(zaklaus): messaging
+
+static int32_t network_msg_send_raw(ENetPeer *peer_id, void *data, size_t datalen, uint32_t flags) {
+    if (peer_id == 0) peer_id = peer;
     ENetPacket *packet = enet_packet_create(data, datalen, flags);
-    return enet_peer_send(peer, 0, packet);
+    return enet_peer_send(peer_id, 0, packet);
 }
 
-int32_t network_msg_send(void *data, size_t datalen) {
-    return network_msg_send_raw(0, data, datalen, ENET_PACKET_FLAG_RELIABLE);
+int32_t network_msg_send(void *peer_id, void *data, size_t datalen) {
+    return network_msg_send_raw(peer_id, data, datalen, ENET_PACKET_FLAG_RELIABLE);
 }
 
-int32_t network_msg_send_unreliable(void *data, size_t datalen) {
-    return network_msg_send_raw(0, data, datalen, 0);
+int32_t network_msg_send_unreliable(void *peer_id, void *data, size_t datalen) {
+    return network_msg_send_raw(peer_id, data, datalen, 0);
 }

code/game/src/network.h

@@ -4,11 +4,20 @@
 int32_t network_init(void);
 int32_t network_destroy(void);
 
+// NOTE(zaklaus): client
 int32_t network_client_connect(const char *host, uint16_t port);
 int32_t network_client_disconnect(void);
 int32_t network_client_tick(void);
 void    network_client_update(void *data);
 bool    network_client_is_connected();
 
-int32_t network_msg_send(void *data, size_t datalen);
-int32_t network_msg_send_unreliable(void *data, size_t datalen);
+// NOTE(zaklaus): server
+int32_t network_server_start(const char *host, uint16_t port);
+int32_t network_server_stop(void);
+int32_t network_server_tick(void);
+void    network_server_assign_entity(void *peer_id, uint64_t ent_id);
+uint64_t network_server_get_entity(void *peer_id);
+
+// NOTE(zaklaus): messaging
+int32_t network_msg_send(void *peer_id, void *data, size_t datalen);
+int32_t network_msg_send_unreliable(void *peer_id, void *data, size_t datalen);

code/game/src/packet_utils.h

@@ -109,10 +109,6 @@ static inline int32_t pkt_world_write(pkt_messages id, size_t pkt_size, int8_t i
 #define PKT_END .type = CWP_NOT_AN_ITEM
 #endif
 
-#ifndef PKT_GET_ENT
-#define PKT_GET_ENT(h) (ecs_entity_t)(h->udata)
-#endif
-
 typedef struct pkt_desc {
     const char *name;
     cwpack_item_types type;

code/game/src/packets/pkt_00_init.c

@@ -3,6 +3,7 @@
 #include "packet.h"
 #include "world/world.h"
 #include "game.h"
+#include "network.h"
 #include "entity_view.h"
 #include "camera.h"
 #include "player.h"
@@ -33,7 +34,16 @@ int32_t pkt_00_init_handler(pkt_header *header) {
     
     uint64_t peer_id = (uint64_t)header->udata;
     uint64_t ent_id = player_spawn(NULL);
-    ecs_set(world_ecs(), ent_id, ClientInfo, {.peer = ent_id, .view_id = header->view_id });
+    
+    Position *pos = ecs_get_mut(world_ecs(), ent_id, Position, NULL);
+    pos->x = world_dim()/2.0f + rand()%15*15.0f;
+    pos->y = world_dim()/2.0f + rand()%15*15.0f;
+    
+    
+    if (game_get_kind() == GAMEKIND_SINGLE) peer_id = ent_id;
+    else network_server_assign_entity(header->udata, ent_id);
+    
+    ecs_set(world_ecs(), ent_id, ClientInfo, {.peer = peer_id, .view_id = header->view_id });
     pkt_01_welcome_send(world_seed(), peer_id, header->view_id, ent_id, world_chunk_size(), world_chunk_amount());
     return 0;
 }

code/game/src/packets/pkt_send_keystate.c

@@ -1,4 +1,5 @@
 #include "packet_utils.h"
+#include "network.h"
 #include "packets/pkt_send_keystate.h"
 #include "modules/components.h"
 #include "modules/systems.h"
@@ -49,7 +50,10 @@ size_t pkt_send_keystate_encode(pkt_send_keystate *table) {
 int32_t pkt_send_keystate_handler(pkt_header *header) {
     pkt_send_keystate table;
     PKT_IF(pkt_msg_decode(header, pkt_send_keystate_desc, pkt_pack_desc_args(pkt_send_keystate_desc), PKT_STRUCT_PTR(&table)));
-    ecs_entity_t e = PKT_GET_ENT(header);
+    ecs_entity_t e = network_server_get_entity(header->udata);
+    
+    if (!world_entity_valid(e))
+        return 1;
     
     Input *i = ecs_get_mut(world_ecs(), e, Input, NULL);
     if (i && !i->is_blocked) {

code/game/src/world/world.c

@@ -261,7 +261,7 @@ static void world_tracker_update(uint8_t ticker, uint32_t freq, uint8_t radius)
                     librg_entity_radius_set(world_tracker(), p[i].peer, radius);
                 }
                 // TODO(zaklaus): push radius once librg patch comes in
-                int32_t result = librg_world_write(world_tracker(), p[i].peer, buffer, &datalen, NULL);
+                int32_t result = librg_world_write(world_tracker(), it.entities[i], buffer, &datalen, NULL);
                 
                 if (result > 0) {
                     zpl_printf("[info] buffer size was not enough, please increase it by at least: %d\n", result);

code/game/src/world/worldgen/worldgen_test.c

@@ -7,6 +7,10 @@
 #include "world/blocks.h"
 #include "world/perlin.h"
 
+#include "modules/components.h"
+#include "vehicle.h"
+#include "items.h"
+
 #define WORLD_BLOCK_OBSERVER(name) uint8_t name(uint8_t id, uint32_t block_idx)
 typedef WORLD_BLOCK_OBSERVER(world_block_observer_proc);
 
@@ -173,5 +177,27 @@ int32_t worldgen_test(world_data *wld) {
     }
 #endif
     
+    // vehicles
+#if 1
+    for (int i=0; i<RAND_RANGE(258, 1124); i++) {
+        uint64_t e = vehicle_spawn();
+        
+        Position *dest = ecs_get_mut(world_ecs(), e, Position, NULL);
+        dest->x = RAND_RANGE(0, world->dim*WORLD_BLOCK_SIZE);
+        dest->y = RAND_RANGE(0, world->dim*WORLD_BLOCK_SIZE);
+    }
+#endif
+    
+    // items
+#if 1
+    for (int i=0; i<RAND_RANGE(328, 164); i++) {
+        uint64_t e = item_spawn(IKIND_DEMO_ICEMAKER, 32);
+        
+        Position *dest = ecs_get_mut(world_ecs(), e, Position, NULL);
+        dest->x = RAND_RANGE(0, world->dim*WORLD_BLOCK_SIZE);
+        dest->y = RAND_RANGE(0, world->dim*WORLD_BLOCK_SIZE);
+    }
+#endif
+    
     return WORLD_ERROR_NONE;
 }

run_client.bat

@@ -0,0 +1,3 @@
+@echo off
+
+build\Debug\eco2d.exe -v %*

run_client_remote.bat

@@ -0,0 +1,5 @@
+@echo off
+
+call package.bat
+
+pkg\eco2d.exe -v %*