game/main.cpp

#include "sdlpp/sdlpp.hpp"
#include <thread>
#include <chrono>
#include <SDL2/SDL2_framerate.h>

#define PLAYER_ID 0x00000001
#define STONE_ID 0x00000002
#define DEATH 0x00000003

#define DESTROYABLE_DESTROY 0x00000001

bool pause = false;
int pause_select = 0;
int pause_max = 1;
std::vector< std::shared_ptr< SDLPP::RectangleRender > > pause_options;

std::shared_ptr< SDLPP::Font > font;
std::shared_ptr< SDLPP::Scene > active_scene;
std::shared_ptr< SDLPP::Scene > pause_scene;

void doInput( std::shared_ptr< SDLPP::Scene > scene );
void doInputPause();

class Player : public SDLPP::RectangleRender {
public:
    Player( double x, double y, double w, double h,
            std::shared_ptr< SDLPP::Renderer > &r, double _max_gravity = 1.0,
            uint32_t _max_gravity_time = 1000 )
            : SDLPP::RectangleRender( x, y, w, h, r ) {
        max_gravity = _max_gravity;
        jump_speed = 2.2 * max_gravity;
        max_gravity_time = _max_gravity_time;
        cur_gravity_time = max_gravity_time;
    }
    void setGravity( bool grav ) {
        gravity_enabled = grav;
    }
    void enableGravity() {
        gravity_enabled = true;
    }
    void disableGravity() {
        gravity_enabled = false;
    }
    bool isGravityEnabled() {
        return gravity_enabled;
    }
    bool isJumping() {
        return jumping;
    }
    void setLastStand() {
        cur_gravity_time = max_gravity_time;
        jumping = false;
    }
    void jump() {
        jumping = true;
    }
    virtual void custom_move( int ticks ) override {
        auto time_portion = ( static_cast< double >( ticks ) / 1000 );
        cur_gravity_time -= ticks;
        auto grav = gravity_enabled * max_gravity *
                    ( max_gravity_time - cur_gravity_time ) / max_gravity_time;
        if ( grav > max_gravity )
            grav = max_gravity;
        // percentage of how close we are to maximum velocity of gravity (0 =
        // we've reached max velocity, 1 = we've just started accelerating)
        double division = static_cast< double >( cur_gravity_time ) /
                          static_cast< double >( max_gravity_time );
        // current jump speed
        auto jump_ = jumping * jump_speed * division;
        if ( division < 0.75 && division >= 0.72 ) {
            // in this time frame, just hover in same place
            jump_ = jumping * grav;
        } else if ( division < 0.72 ) {
            // fall slowly
            jump_ = jumping * jump_speed * division * 0.15;
            if ( jump_ > grav )
                jump_ = grav;
        }
        if ( jump_ < 0 || jump_ > jump_speed )
            jump_ = 0;
        double addition = grav * time_portion - jump_ * time_portion;
        original += {0, addition};
    }

private:
    double max_gravity = 1.0;
    double jump_speed = 2.0;
    uint32_t max_gravity_time = 1000;
    uint32_t cur_gravity_time = 1000;
    bool gravity_enabled = false;
    bool jumping = false;
};

class Destroyable : public SDLPP::RectangleRender {
public:
    Destroyable( double x, double y, double w, double h,
                 std::shared_ptr< SDLPP::Renderer > &r )
            : SDLPP::RectangleRender( x, y, w, h, r ) {}
    Destroyable( double x, double y, double w, double h,
                 std::shared_ptr< SDLPP::Renderer > &r, int destruction_time )
            : SDLPP::RectangleRender( x, y, w, h, r ) {
        destruction_countdown = destruction_time;
    }
    virtual void specialAction( int code ) override {
        if ( code == DESTROYABLE_DESTROY )
            startDestruction();
    }
    virtual void custom_move( int ticks ) override {
        if ( destruction ) {
            destruction_countdown -= ticks;
            if ( destruction_countdown <= 0 )
                destroy();
        }
    }

private:
    void startDestruction() {
        destruction = true;
    }
    bool destruction = false;
    int destruction_countdown = 3000;
};

std::shared_ptr< Player > player;
bool quit = false;

void addStuff( SDLPP::Scene &scene, std::shared_ptr< SDLPP::Renderer > &r ) {
    auto bg = std::make_shared< SDLPP::RectangleRender >( 0, 0, 10, 10, r,
                                                          "#ebdbb2FF", true );
    bg->setId( 123 );
    bg->setPermanent( true );
    scene.addObject( bg );
    std::shared_ptr< Destroyable > stone;
    double posx = 0;
    while ( posx < 3 ) {
        stone =
            std::make_shared< Destroyable >( posx, 0.5, 0.15, 0.1, r, 1000 );
        stone->addCollision( SDLPP::RectColider( 0, 0, 1, 1 ) );
        stone->setColor( "#222222FF" );
        stone->setId( STONE_ID );
        stone->setColiderColor( "FF0000" );
        scene.addObject( stone );
        posx += 0.45;
    }
    auto x = std::make_shared< Player >( 0, 0, 0.2, 0.2, r );
    x->addCollision( SDLPP::RectColider( 0.3, 0.7, 0.05, 0.31 ) );
    x->addCollision( SDLPP::RectColider( 0.65, 0.7, 0.05, 0.31 ) );
    x->addCollision( SDLPP::RectColider( 0.2, 0.3, 0.6, 0.45 ) );
    x->addCollision( SDLPP::CircleColider( 0.5, 0.15, 0.3 ) );
    x->setColor( "E164B7" );
    x->setId( PLAYER_ID );
    x->setColiderColor( "00FF00" );
    scene.addObject( x );
    player = x;
    auto z = std::make_shared< SDLPP::RectangleRender >( 0, 2.5, 0, 0, r );
    auto z_col = SDLPP::RectColider( -1, 0, -1, -1 );
    z_col.setInfinite();
    z->addCollision( z_col );
    z->setId( DEATH );
    z->setColiderColor( "FF00FF" );
    scene.addObject( z );
    auto y = std::make_shared< SDLPP::TextRenderer >( 0, 0, 0.2, 0.1, r );
    y->setText( font, "DEMO", "#FFFFFF", "#000000", 5 );
    y->setPermanent( true );
    y->setId( 123 );
    scene.addObject( y );
}

void addPause( SDLPP::Scene &scene, std::shared_ptr< SDLPP::Renderer > &r ) {
    auto bg = std::make_shared< SDLPP::RectangleRender >( 0, 0, 10, 10, r,
                                                          "#00000080", true );
    bg->setId( 123 );
    bg->setPermanent( true );
    scene.addObject( bg );
    auto y = std::make_shared< SDLPP::TextRenderer >( 0.25, 0.1, 0.5, 0.3, r );
    y->setText( font, "PAUSED", "#FFFFFF", "#000000", 5 );
    y->setId( 0 );
    y->centerX();
    scene.addObject( y );
    auto resume =
        std::make_shared< SDLPP::TextRenderer >( 0.4, 0.5, 0.2, 0.1, r );
    resume->setText( font, "Resume", "#FFFFFF", "#000000", 5 );
    resume->setColor( "#FFFFFF40" );
    resume->centerX();
    scene.addObject( resume );
    pause_options.push_back( resume );
    auto quit =
        std::make_shared< SDLPP::TextRenderer >( 0.4, 0.7, 0.2, 0.1, r );
    quit->setText( font, "Quit Game", "#FFFFFF", "#000000", 5 );
    quit->centerX();
    scene.addObject( quit );
    pause_options.push_back( quit );
}

void quitGame() {
    std::cout << "Quitting!" << std::endl;
    quit = true;
}

void handleKeyDown( SDL_Keycode key, SDLPP::Scene &scene ) {
    switch ( key ) {
    case SDLK_ESCAPE: {
        pause = true;
        pause_scene->updateSizeAndPosition();
        player->resetMovementX();
        std::thread pauseThread( doInputPause );
        pauseThread.detach();
    } break;
    case SDLK_a:
        player->addMovement( -1, 0 );
        break;
    case SDLK_d:
        player->addMovement( 1, 0 );
        break;
    case SDLK_SPACE:
    case SDLK_w:
        if ( !player->isJumping() && !pause ) {
            player->setLastStand();
            player->jump();
        }
        break;
    case SDLK_s:
        break;
    case SDLK_r:
        scene.getRenderer().setRenderColiders(
            !scene.getRenderer().getRenderColiders() );
    default:
        break;
    }
}

void handleKeyDownPause( SDL_Keycode key ) {
    switch ( key ) {
    case SDLK_ESCAPE: {
        pause = false;
        active_scene->setPrevTicks( SDL_GetTicks() );
        std::thread inputThread( doInput, active_scene );
        inputThread.detach();
    } break;
    case SDLK_r:
        active_scene->getRenderer().setRenderColiders(
            !active_scene->getRenderer().getRenderColiders() );
        break;
    case SDLK_s:
    case SDLK_DOWN:
        pause_options[pause_select]->unsetColor();
        pause_select++;
        if ( pause_select > pause_max )
            pause_select = 0;
        pause_options[pause_select]->setColor( "FFFFFF40" );
        break;
    case SDLK_w:
    case SDLK_UP:
        pause_options[pause_select]->unsetColor();
        pause_select--;
        if ( pause_select < 0 )
            pause_select = pause_max;
        pause_options[pause_select]->setColor( "FFFFFF40" );
        break;
    case SDLK_RETURN:
        switch ( pause_select ) {
        case 0: {
            pause = false;
            active_scene->setPrevTicks( SDL_GetTicks() );
            std::thread inputThread( doInput, active_scene );
            inputThread.detach();
        } break;
        case 1:
            quitGame();
        default:
            break;
        }
    default:
        break;
    }
}

void handleKeyUp( SDL_Keycode key ) {
    switch ( key ) {
    case SDLK_a:
        player->addMovement( 1, 0 );
        break;
    case SDLK_d:
        player->addMovement( -1, 0 );
        break;
    case SDLK_w:
    case SDLK_s:
    default:
        break;
    }
}

void pollEvents( SDLPP::Scene &scene ) {
    SDL_Event event;
    while ( SDL_PollEvent( &event ) != 0 ) {
        switch ( event.type ) {
        case SDL_QUIT:
            quitGame();
            break;
        case SDL_KEYDOWN:
            if ( !event.key.repeat )
                handleKeyDown( event.key.keysym.sym, scene );
            break;
        case SDL_KEYUP:
            handleKeyUp( event.key.keysym.sym );
            break;
        case SDL_WINDOWEVENT:
            if ( event.window.event == SDL_WINDOWEVENT_RESIZED )
                scene.updateSizeAndPosition();
        default:
            break;
        }
    }
}

void pollEventsPause() {
    SDL_Event event;
    while ( SDL_PollEvent( &event ) != 0 ) {
        switch ( event.type ) {
        case SDL_QUIT:
            quitGame();
            break;
        case SDL_KEYDOWN:
            if ( !event.key.repeat )
                handleKeyDownPause( event.key.keysym.sym );
            break;
        case SDL_WINDOWEVENT:
            if ( event.window.event == SDL_WINDOWEVENT_RESIZED ) {
                active_scene->updateSizeAndPosition();
                pause_scene->updateSizeAndPosition();
            }
        default:
            break;
        }
    }
}

void doInput( std::shared_ptr< SDLPP::Scene > scene ) {
    FPSmanager gFPS;
    SDL_initFramerate( &gFPS );
    SDL_setFramerate( &gFPS, 200 );
    while ( !quit && !pause ) {
        SDL_framerateDelay( &gFPS );
        pollEvents( *scene );
        scene->movement();
        bool gravity = true;
        for ( auto &x : scene->getCollisions( *player ) ) {
            if ( x->getId() == STONE_ID ) {
                gravity = false;
                if ( player->isGravityEnabled() ) {
                    auto stoneRect = x->getDoubleRect();
                    auto playerPos = player->getDoubleRect();
                    auto newPX = playerPos.first.first;
                    auto newPY =
                        stoneRect.first.second - playerPos.second.second;
                    player->setPos( newPX, newPY );
                    player->setLastStand();
                }
                x->specialAction( DESTROYABLE_DESTROY );
            }
            if ( x->getId() == DEATH ) {
                std::cout << "Oh no, you died!" << std::endl;
                quitGame();
            }
        }
        player->setGravity( gravity );
        auto playerX = player->getRect().x;
        auto width = scene->getWidth();
        auto rightBarrier = width * 0.7;
        auto leftBarrier = width * 0.3;
        auto rightmostX =
            scene->rightmost()->getRect().x + scene->rightmost()->getRect().w;
        auto leftmostX = scene->leftmost()->getRect().x;
        scene->moveEverything(
            ( playerX > rightBarrier && rightmostX > width ) *
                ( rightBarrier - playerX ) / width,
            0 );
        scene->moveEverything( ( playerX < leftBarrier && leftmostX < 0 ) *
                                   ( leftBarrier - playerX ) / width,
                               0 );
    }
}

void doInputPause() {
    FPSmanager gFPS;
    SDL_initFramerate( &gFPS );
    SDL_setFramerate( &gFPS, 200 );
    while ( pause ) {
        SDL_framerateDelay( &gFPS );
        pollEventsPause();
        if ( !pause )
            break;
    }
}

int main() {
    SDLPP::init();
    SDLPP::Window w( "Oh yeah, boi!" );
    auto renderer = std::make_shared< SDLPP::Renderer >( w );
    renderer->setBlendMode( SDL_BLENDMODE_BLEND );
    auto main_scene = std::make_shared< SDLPP::Scene >( renderer );
    active_scene = main_scene;
    font = std::make_shared< SDLPP::Font >( "testfont.ttf", 96 );
    addStuff( *main_scene, renderer );
    player->setMovementSpeed( 0.3 );
    player->enableGravity();

    pause_scene = std::make_shared< SDLPP::Scene >( renderer );
    addPause( *pause_scene, renderer );

    int base = SDL_GetTicks();
    int frames = 0;

    FPSmanager gFPS;
    SDL_initFramerate( &gFPS );
    SDL_setFramerate( &gFPS, 60 );
    std::thread inputThread( doInput, main_scene );
    inputThread.detach();
    while ( !quit ) {
        //        SDL_framerateDelay(&gFPS);
        main_scene->renderScene();
        if ( pause ) {
            pause_scene->renderScene( false );
        }
        main_scene->presentScene();
        frames++;
        if ( SDL_GetTicks() - base >= 1000 ) {
            base = SDL_GetTicks();
            printf( "FPS: %d\n", frames );
            frames = 0;
        }
    }
}