IAEngine/Src/IAEngine/imp/cpp/IAEngine.cpp

// IAEngine: 2D Game Engine by IA
// Copyright (C) 2025 IASoft (PVT) LTD (oss@iasoft.dev)
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

// #include <EmbeddedResources.hpp>
#include <GameData.hpp>
#include <IAEngine/LibInterface.hpp>

#include <RenderCore/RenderCore.hpp>

namespace ia::iae
{
    Asset_Scene *g_activeScene{};

    String g_gameName;
    String g_gamePackageName;
    String g_gameDeveloperName;
    String g_gamePublisherName;
    IA_VERSION_TYPE g_gameVersion{};

    Vec2 g_designViewport;
    SDL_Window *g_windowHandle{};

    Vector<Asset_Plugin *> g_plugins;

    AssetManager* g_assetManager{};
    AssetManager* g_defaultAssetManager{};

#if defined(__IA_DEBUG) && __IA_DEBUG
    BOOL g_isDebugMode = true;
#else
    BOOL g_isDebugMode = false;
#endif

    BOOL g_isHeadlessMode = false;

    INT32 Run(IN CONST String &name, IN CONST String &packageName, IN CONST String &developerName,
              IN CONST String &publisherName, IN IA_VERSION_TYPE version)
    {
        INT32 frameCounter{0};

        g_gameName = name;
        g_gameVersion = version;
        g_gamePackageName = packageName;
        g_gameDeveloperName = developerName;
        g_gamePublisherName = publisherName;

        const auto config = Game_GetConfigRequest();

        g_designViewport.x = config->DesignWidth;
        g_designViewport.y = config->DesignHeight;

        IAE_LOG_INFO("Booting IAEngine for ", g_gameName);

        SDL_SetHint(SDL_HINT_ORIENTATIONS, "LandscapeRight");

        if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_GAMEPAD))
            THROW_UNKNOWN("Failed to intialize SDL: ", SDL_GetError());

        if (!(g_windowHandle = SDL_CreateWindow(g_gameName.c_str(), config->WindowWidth, config->WindowHeight,
                                                SDL_WINDOW_RESIZABLE)))
            THROW_UNKNOWN("Failed to create the SDL window: ", SDL_GetError());

#if __ANDROID__
        SDL_SetWindowFullscreen(g_windowHandle, true);
#endif

        const auto gameVersion = g_gameVersion;
        SDL_SetAppMetadata(g_gameName.c_str(), IA_STRINGIFY_VERSION(gameVersion).c_str(), g_gamePackageName.c_str());

        // EmbeddedResources::Initialize();

        IAEngine::__Initialize("./Assets/");

        SDL_Event event{};
        while (true)
        {
            SDL_PollEvent(&event);
            if (event.type == SDL_EVENT_QUIT)
                break;
            IAEngine::__ProcessEvent(&event);
            IAEngine::__Update();

            frameCounter++;
            if (frameCounter >= 60)
            {
                frameCounter = 0;
                IAEngine::__FixedUpdate();
            }

            IAEngine::__RenderToWindow();
        }

        IAEngine::__Terminate();

        // EmbeddedResources::Terminate();

        SDL_DestroyWindow(g_windowHandle);

        IAE_LOG_INFO("Shutting down IAEngine");

        return 0;
    }
} // namespace ia::iae

namespace ia::iae
{
    VOID IAEngine::__Initialize(IN CONST String& assetDirectory)
    {
        g_isHeadlessMode = false;

        RDC::Initialize(IVec2{g_designViewport.x, g_designViewport.y}, g_windowHandle, g_isDebugMode);

        g_defaultAssetManager = new AssetManager();
        g_assetManager = g_defaultAssetManager;
        g_assetManager->SetAssetDirectory(assetDirectory);

        GameData::Initialize();

        ChangeActiveScene(GameData::GetEntryScene()
                              ? GameData::GetEntryScene()
                              : g_assetManager->CreateScene({g_designViewport.x, g_designViewport.y}));

        Game_OnInitialize();

        for (auto &p : g_plugins)
            p->OnInitialize();
    }

    VOID IAEngine::__InitializeHeadless(IN CONST String& assetDirectory)
    {
        g_isHeadlessMode = true;

        if (!g_designViewport.x || !g_designViewport.y)
            g_designViewport = {800, 600};

        g_defaultAssetManager = new AssetManager();
        g_assetManager = g_defaultAssetManager;
        g_assetManager->SetAssetDirectory(assetDirectory);

        GameData::Initialize();

        ChangeActiveScene(GameData::GetEntryScene()
                              ? GameData::GetEntryScene()
                              : g_assetManager->CreateScene({g_designViewport.x, g_designViewport.y}));

        Game_OnInitialize();

        for (auto &p : g_plugins)
            p->OnInitialize();
    }

    VOID IAEngine::__Terminate()
    {
        for (auto &p : g_plugins)
            p->OnTerminate();

        Game_OnTerminate();

        GameData::Terminate();

        delete g_defaultAssetManager;

        RDC::Terminate();
    }

    VOID IAEngine::__RenderToWindow()
    {
        g_activeScene->GetScene().OnDraw();
        RDC::RenderToWindow();

        g_activeScene->GetScene().OnDebugDraw();
        Game_OnDebugDraw();

        for (auto &p : g_plugins)
            p->OnDebugDraw();
    }

    VOID IAEngine::__RenderToTexture(IN PVOID textureHandle)
    {
        g_activeScene->GetScene().OnDraw();
        RDC::RenderToTexture((SDL_GPUTexture *) textureHandle);

        g_activeScene->GetScene().OnDebugDraw();
        Game_OnDebugDraw();

        for (auto &p : g_plugins)
            p->OnDebugDraw();
    }

    VOID IAEngine::__Update()
    {
        FLOAT32 deltaTime = 0;

        g_activeScene->GetScene().OnUpdate(deltaTime);
        Game_OnUpdate(deltaTime);

        for (auto &p : g_plugins)
            p->OnUpdate(deltaTime);
    }

    VOID IAEngine::__FixedUpdate()
    {
        g_activeScene->GetScene().OnFixedUpdate();
        Game_OnFixedUpdate();

        for (auto &p : g_plugins)
            p->OnFixedUpdate();
    }

    VOID IAEngine::__ProcessEvent(IN PVOID _event)
    {
        const auto event = (SDL_Event *) _event;
    }

    VOID IAEngine::AddPlugin(IN Asset_Plugin *plugin)
    {
        g_plugins.pushBack(plugin);
    }

    AssetManager* IAEngine::GetAssetManager()
    {
        return g_assetManager;
    }

    VOID IAEngine::SetAssetManager(IN AssetManager *instance)
    {
        g_assetManager = instance;
    }
} // namespace ia::iae

namespace ia::iae
{
    VOID IAEngine::DrawTile(IN Asset_TileSheet *tileSheet, IN INT32 tileIndexX, IN INT32 tileIndexY, IN Vec2 position,
                            IN Vec2 scale, IN FLOAT32 rotation, IN BOOL flipH, IN BOOL flipV, IN Vec2 uvOffset)
    {
        RDC::DrawSpriteTopLeft(tileSheet->GetTexture(), tileIndexX, tileIndexY, position, scale, rotation, flipH, flipV,
                               uvOffset);
    }

    VOID IAEngine::DrawSprite(IN Asset_Sprite *sprite, IN Vec2 position, IN Vec2 scale, IN FLOAT32 rotation,
                              IN BOOL flipH, IN BOOL flipV, IN Vec2 uvOffset)
    {
        RDC::DrawSpriteTopLeft(sprite->GetTexture(), 0, 0, position, scale, rotation, flipH, flipV, uvOffset);
    }

    VOID IAEngine::DrawSprite(IN Asset_SpriteSheet *spriteSheet, IN INT32 animationIndex, IN INT32 frameIndex,
                              IN Vec2 position, IN Vec2 scale, IN FLOAT32 rotation, IN BOOL flipH, IN BOOL flipV,
                              IN Vec2 uvOffset)
    {
        RDC::DrawSpriteTopLeft(spriteSheet->GetTexture(), frameIndex, animationIndex, position, scale, rotation, flipH,
                               flipV, uvOffset);
    }
} // namespace ia::iae

namespace ia::iae
{
    Asset_Scene *IAEngine::GetActiveScene()
    {
        return g_activeScene;
    }

    VOID IAEngine::ChangeActiveScene(IN Asset_Scene *scene)
    {
        g_activeScene = scene;
    }
} // namespace ia::iae