path: root/client/client.c

#include "queue.h"
#include "raylib.h"
#include "raymath.h"
#include "shared.h"
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "client.h"

PacketQueue incomingQueue;
ClientPacket latestPacket;
pthread_mutex_t packetLock = PTHREAD_MUTEX_INITIALIZER;
double lastSendTime = 0;
RemotePlayer remotePlayers[MAX_PLAYERS];  // add here
ClientNPC clientNPCs[MAX_VIEW_NPCS];

#define PING_SAMPLES 20
double pingSamples[PING_SAMPLES] = {0};
int pingSampleIndex = 0;
double pingMs = 0;

void SendPing() {
    PingPacket ping = {
        .type     = PACKET_PING,
        .sentTime = GetWallTime()
    };
    sendto(networkFd, &ping, sizeof(ping), 0,
           (struct sockaddr *)&server, sizeof(server));
}

float GetTerrainHeight(float x, float z) {
    Vector3 rayOrigin = { x, 99999.0f, z };
    Ray ray = { rayOrigin, (Vector3){0, -1, 0} };
    RayCollision hit = GetRayCollisionMesh(ray, terrainMesh, terrainTransform);
    if (hit.hit) return hit.point.y;
    return 0.0f; // fallback if miss
}

void PrintAddress(struct sockaddr_in *addr) {
    char ip[INET_ADDRSTRLEN];

    inet_ntop(AF_INET, &addr->sin_addr, ip, sizeof(ip));

    printf("IP: %s, Port: %d\n", ip, ntohs(addr->sin_port));
}

Vector3 ToRaylib(Vec3 v) {
    return (Vector3){ v.x, v.y, v.z };
}

Vec3 FromRaylib(Vector3 v) {
    return (Vec3){ v.x, v.y, v.z };
}

void NetworkInit() {
  net_init();

  networkFd = socket(AF_INET, SOCK_DGRAM, 0);

  if (networkFd == -1)
    err(EXIT_FAILURE, "socket failed");

  server.sin_family = AF_INET;
  server.sin_port = htons(8080);
  inet_pton(AF_INET, "10.148.10.109", &server.sin_addr);
}

void NetworkShutdown() {
  close(networkFd);
  net_cleanup();
}

void *RecvThread(void *arg) {
    uint8_t buffer[PACKET_MAX_SIZE];
    struct sockaddr_in from;
    socklen_t fromLen = sizeof(from);

    while (1) {
      int size = recvfrom(networkFd, (char *)buffer, sizeof(buffer), 0,
                          (struct sockaddr *)&from, &fromLen);

      if (size <= 0) continue;

        PacketType type = *(PacketType *)buffer;

        // handle pong immediately
        if (type == PACKET_PONG) {
	  PingPacket *pong = (PingPacket *)buffer;
	  double sample = (GetWallTime() - pong->sentTime) * 1000.0;

// update rolling average
	  pingSamples[pingSampleIndex % PING_SAMPLES] = sample;
	  pingSampleIndex++;
	  double total = 0;
	  int count = pingSampleIndex < PING_SAMPLES ? pingSampleIndex : PING_SAMPLES;
	  for (int i = 0; i < count; i++) total += pingSamples[i];
	  pingMs = total / count;
	  continue;
        }

	QueuePush(&incomingQueue, buffer, size);
    }
    return NULL;
}

// send thread - fires every 50ms
void *SendThread(void *arg) {
    double accumulator  = 0;
    double previousTime = GetWallTime();

    while (1) {
        double currentTime = GetWallTime();
        double elapsed     = currentTime - previousTime;
        previousTime       = currentTime;
        accumulator       += elapsed;

        while (accumulator >= NETWORK_RATE) {
            pthread_mutex_lock(&packetLock);
            lastSendTime = GetWallTime();
            sendto(networkFd, (const char *)&latestPacket, sizeof(latestPacket), 0,
                   (struct sockaddr *)&server, sizeof(server));

            pthread_mutex_unlock(&packetLock);
            accumulator -= NETWORK_RATE;
        }

        sleep_us(1000);
    }
    return NULL;
}

// main thread processes incoming queue each frame
void ProcessIncoming() {
    uint8_t buffer[PACKET_MAX_SIZE];
    int size;
    while (QueuePop(&incomingQueue, buffer, &size)) {
      PacketType type = *(PacketType *)buffer;
        switch (type) {
            case PACKET_SERVER_SNAPSHOT:
                HandleSnapshot((ServerSnapshot *)buffer);
                break;
            case PACKET_PLAYER_JOINED:
                HandlePlayerJoined((PlayerJoinedPacket *)buffer);
                break;
            case PACKET_PLAYER_LEFT:
                HandlePlayerLeft((PlayerJoinedPacket *)buffer);
                break;
            case PACKET_HANDSHAKE_RESPONSE:
                HandleHandshakeResponse((HandshakeResponsePacket *)buffer);
                break;
        }
    }
}


void HandleSnapshot(ServerSnapshot *snapshot) {
    for (int i = 0; i < snapshot->playerCount; i++) {
        int id = snapshot->players[i].id;
        if (id == player.id) {
            ReconcilePlayer(&player, ToRaylib(snapshot->players[i].position));
        } else {
            remotePlayers[id].active          = true;
            remotePlayers[id].serverPosition  = ToRaylib(snapshot->players[i].position);
            remotePlayers[id].serverYaw       = snapshot->players[i].yaw;
            remotePlayers[id].serverVelocityY = snapshot->players[i].velocity.y;
	    remotePlayers[id].serverOnGround = snapshot->players[i].onGround;            // add this
        }
    }
    for (int i = 0; i < snapshot->npcCount; i++) {
      clientNPCs[i].id = snapshot->npcs[i].id;
      clientNPCs[i].active = true;
      clientNPCs[i].serverPosition = ToRaylib(snapshot->npcs[i].position);
      clientNPCs[i].serverRotation = snapshot->npcs[i].rotation;
      clientNPCs[i].health = snapshot->npcs[i].health;
      clientNPCs[i].state = snapshot->npcs[i].state;
      clientNPCs[i].model = snapshot->npcs[i].model;
      clientNPCs[i].scale = (Vector3){snapshot->npcs[i].scale, snapshot->npcs[i].scale, snapshot->npcs[i].scale};
    }
}

void HandlePlayerJoined(PlayerJoinedPacket *packet) {
    int id = packet->playerId;
    remotePlayers[id].active = true;
    remotePlayers[id].id     = id;

    // set initial position so they don't lerp from 0,0,0
    remotePlayers[id].currentPosition = ToRaylib(packet->position);
    remotePlayers[id].serverPosition = ToRaylib(packet->position);
    remotePlayers[id].serverYaw       = 0;
    remotePlayers[id].currentYaw = 0;

    printf("remote character model %d\n", packet->characterClass);

    remotePlayers[id].characterClass = packet->characterClass;

    // load correct model based on their class
    switch (packet->characterClass) {
    case 0: remotePlayers[id].model = LoadModel("assets/dungeon/Models/GLB format/character-orc-f.glb"); break;
    case 1:
      remotePlayers[id].model = LoadModel("assets/dungeon/Models/GLB format/character-human.glb");
      break;
    case 2: remotePlayers[id].model = LoadModel("assets/arena/Models/GLB format/character-soldier.glb");    break;
    }

    TraceLog(LOG_INFO, "Player %d joined", id);
}

void HandlePlayerLeft(PlayerJoinedPacket *packet) {
    int id = packet->playerId;
    remotePlayers[id].active = false;

    // unload their model to free memory
    /* UnloadModel(remotePlayers[id].model); */

    TraceLog(LOG_INFO, "Player %d left", id);
}

void HandleHandshakeResponse(HandshakeResponsePacket *packet) {
    player.id = packet->playerId;
    latestPacket.playerId = packet->playerId;
    printf("assigned player id: %d\n", player.id);
    scene = 1;
    DisableCursor();
}

void ReconcilePlayer(Player *p, Vector3 serverPosition) {
    p->position.x = Lerp(p->position.x, serverPosition.x, 0.3f);
    p->position.z = Lerp(p->position.z, serverPosition.z, 0.3f);
}

void InitRemotePlayers() {
    for (int i = 0; i < MAX_PLAYERS; i++) {
        remotePlayers[i].active          = false;
        remotePlayers[i].currentPosition = (Vector3){600, GetTerrainHeight(600,-1200), -1200};
        remotePlayers[i].serverPosition  = (Vector3){600, GetTerrainHeight(600,-1200), -1200};
        remotePlayers[i].currentYaw      = 0;
        remotePlayers[i].serverYaw       = 0;
    }
}

// client.c
void UpdateRemotePlayer(RemotePlayer *p, float dt) {
    p->currentPosition.x = Lerp(p->currentPosition.x, p->serverPosition.x, 25.0f * dt);
    p->currentPosition.z = Lerp(p->currentPosition.z, p->serverPosition.z, 25.0f * dt);

    if (p->serverOnGround) {
        // on ground - snap Y to terrain
        float localY = GetTerrainHeight(p->currentPosition.x, p->currentPosition.z);
        if (localY != 0.0f)
            p->currentPosition.y = localY;
    } else {
        // in air - lerp Y toward server position for smooth arc
        p->currentPosition.y = Lerp(p->currentPosition.y, p->serverPosition.y, 15.0f * dt);
    }

    p->currentYaw = Lerp(p->currentYaw, p->serverYaw, 25.0f * dt);
}