GameEngine.cpp

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/*
Olympe Engine V2 2025
Nicolas Chereau
nchereau@gmail.com
 
Purpose:
- Class representing the core game engine
- Gamengine stores the list of all game objects
- Initializes core subsystems
- Manages the main game loop timing (delta time)
 
*/
#pragma once
 
#include "GameEngine.h"
#include "InputsManager.h"
#include "system/SystemMenu.h"
#include "VideoGame.h"
#include "OptionsManager.h"
#include "DataManager.h"
#include "PanelManager.h"
#include "World.h"
#include "system/CameraEventHandler.h"
#include "AI/BehaviorTree.h"
#include "Animation/AnimationManager.h"
 
float GameEngine::fDt = 0.0f;
SDL_Renderer* GameEngine::renderer = nullptr;
int GameEngine::screenWidth = 1280;
int GameEngine::screenHeight = 720;
//-------------------------------------------------------------
void GameEngine::Initialize()
{
    ptr_inputsmanager = &InputsManager::GetInstance();
    ptr_systemmenu = &SystemMenu::GetInstance();
    ptr_videogame = &VideoGame::GetInstance();
    ptr_optionsmanager = &OptionsManager::GetInstance();
    ptr_datamanager = &DataManager::GetInstance();
 
    // Preload system resources from olymp.ini
    DataManager::Get().PreloadSystemResources("./olympe.ini");
 
    // Create and initialize panel manager
    //PanelManager::Get().Initialize();
    //PanelManager::Get().CreateMainMenuWindow();
    //PanelManager::Get().CreateLogWindow();
    //PanelManager::Get().CreateObjectInspectorWindow();
    //PanelManager::Get().CreateTreeViewWindow();   
    //PanelManager::Get().CreateInputsInspectorWindow();
    // By default keep them hidden; can be shown by the UI later
    
    // Initialize camera event handler
    CameraEventHandler::Get().Initialize();
    
    // Load AI Behavior Trees
    //SYSTEM_LOG << "Loading AI Behavior Trees...\n";
    //BehaviorTreeManager::Get().LoadTreeFromFile("Blueprints/AI/idle.json", 1);
    //BehaviorTreeManager::Get().LoadTreeFromFile("Blueprints/AI/guard_patrol.json", 2);
    //BehaviorTreeManager::Get().LoadTreeFromFile("Blueprints/AI/guard_combat.json", 3);
    //BehaviorTreeManager::Get().LoadTreeFromFile("Blueprints/AI/investigate.json", 5);
    //SYSTEM_LOG << "AI Behavior Trees loaded.\n";
    
    // Initialize Animation System
    SYSTEM_LOG << "Initializing Animation System...\n";
    OlympeAnimation::AnimationManager::Get().Init();
    OlympeAnimation::AnimationManager::Get().LoadAnimationBanks("Gamedata/Animations/AnimationBanks");
    OlympeAnimation::AnimationManager::Get().LoadAnimationGraphs("Gamedata/Animations/AnimationGraphs");
    SYSTEM_LOG << "Animation System initialized.\n";
    
    // Create default camera for player 0 with keyboard controls
    CameraSystem* camSys = World::Get().GetSystem<CameraSystem>();
    if (camSys)
    {
        EntityID defaultCamera = camSys->CreateCameraForPlayer(-1, true); // true = bind to keyboard
        SYSTEM_LOG << "Created default ECS camera for player -1 (Entity " << defaultCamera << ")\n";
    }
}
//-------------------------------------------------------------
void GameEngine::Process()
{
    // Calculate Delta Time for th entire engine cycle
    const Uint64 now = SDL_GetTicks();
    static Uint64 last_time = 0;
    fDt = ((float)(now - last_time)) / 1000.0f;  /* seconds since last iteration */
    last_time = now;
}
//-------------------------------------------------------------