game/main.cpp

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

#define PLAYER_ID 0x00000001
#define STONE_ID 0x00000002

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 = 1.5*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 move(int ticks) {
        auto dimension = renderer->getSmallerSide();
        auto time_portion = (static_cast<double>(ticks)/1000);
        auto addx = static_cast<double>(movementSpeed * movementDirection.first)*time_portion;
        auto addy = static_cast<double>(movementSpeed * movementDirection.second)*time_portion;
        x_ += addx;
        y_ += addy;
        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;
        auto jump_ = jumping * jump_speed * cur_gravity_time/max_gravity_time;
        if(jump_ < 0 || jump_ > jump_speed)
            jump_ = 0;
        y_ += grav * time_portion;
        y_ -= jump_ * time_portion;
        rect.x = x_ * dimension;
        rect.y = y_ * dimension;
        for( auto &x : collisions ) {
            x->updateCollision(collisionPushX(), collisionPushY(), collisionWidth(), collisionHeight());
        }
    }
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;
};

std::shared_ptr<Player> player;
std::vector<std::shared_ptr<SDLPP::Texture>> bgtextures;
bool quit = false;

void addStuff(SDLPP::Scene &scene, std::shared_ptr<SDLPP::Renderer> &r) {
    std::shared_ptr<SDLPP::RectangleRender> stone;
    double posx = 0;
    while(posx < 1) {
        stone = std::make_shared<SDLPP::RectangleRender>(posx,0.5,0.15,0.1,r);
        stone->addCollision(SDLPP::Rect(0,0,1,1));
        stone->setTexture("stone.png");
        stone->setId(STONE_ID);
        scene.addObject(stone);
        posx += 0.15;
    }
    auto x = std::make_shared<Player>(0,0,0.2,0.2, r);
    x->addCollision(SDLPP::Rect(0,0,1,1));
    x->setTexture("5.png");
    x->setId(PLAYER_ID);
    scene.addObject(x);
    player = x;
}

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

void handleKeyDown(SDL_Keycode key, SDLPP::Scene &scene) {
    switch(key) {
        case SDLK_UP:
            scene.setBackground(bgtextures[0]);
            break;
        case SDLK_DOWN:
            scene.setBackground(bgtextures[1]);
            break;
        case SDLK_RIGHT:
            scene.setBackground(bgtextures[2]);
            break;
        case SDLK_LEFT:
            scene.setBackground(bgtextures[3]);
            break;
        case SDLK_ESCAPE:
            quitGame();
            break;
        case SDLK_a:
            player->addMovement(-1,0);
            break;
        case SDLK_d:
            player->addMovement(1,0);
            break;
        case SDLK_w:
            if(!player->isJumping()) {
                player->setLastStand();
                player->jump();
            }
            break;
        case SDLK_s:
            break;
        default:
            scene.setBackground(bgtextures[4]);
            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:
            break;
        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 doInput(std::shared_ptr<SDLPP::Scene> scene) {
    FPSmanager gFPS;
    SDL_initFramerate(&gFPS);
    SDL_setFramerate(&gFPS, 200);
    int base = SDL_GetTicks();
    int frames = 0;
    while(!quit) {
        SDL_framerateDelay(&gFPS);
        pollEvents(*scene);
        scene->movement();
        bool gravity = true;
        for( auto &x : scene->getCollisions(*player) ) {
            if( x->getId() == STONE_ID ) {
                gravity = false;
                auto stoneRect = x->getDoubleRect();
                auto playerPos = player->getDoubleRect();
                auto newPX = playerPos.first.first;
                auto newPY = playerPos.first.second;
                newPY = stoneRect.first.second - playerPos.second.second;
                player->setPos(newPX, newPY);
                if(player->isGravityEnabled())
                    player->setLastStand();
            }
        }
        player->setGravity(gravity);
        frames++;
        if(SDL_GetTicks() - base >= 1000) {
            base = SDL_GetTicks();
            printf("FPS: %d\n", frames);
            frames = 0;
        }
    }
}

int main() {
    SDLPP::init();
    SDLPP::Window w("Oh yeah, boi!");
    auto renderer = std::make_shared<SDLPP::Renderer>(w);
    auto main_scene = std::make_shared<SDLPP::Scene>(renderer);
    bgtextures.push_back(std::make_shared<SDLPP::Texture>(renderer, "1.bmp"));
    bgtextures.push_back(std::make_shared<SDLPP::Texture>(renderer, "2.bmp"));
    bgtextures.push_back(std::make_shared<SDLPP::Texture>(renderer, "3.png"));
    bgtextures.push_back(std::make_shared<SDLPP::Texture>(renderer, "4.png"));
    bgtextures.push_back(std::make_shared<SDLPP::Texture>(renderer, "test.bmp"));
    main_scene->setBackground(bgtextures[0]);
    addStuff(*main_scene, renderer);
    player->setMovementSpeed(0.3);
    player->enableGravity();

    FPSmanager gFPS;
    SDL_initFramerate(&gFPS);
    SDL_setFramerate(&gFPS, 60);
    std::thread inputThread(doInput, main_scene);
    while( !quit ) {
        SDL_framerateDelay(&gFPS);
        main_scene->renderScene();
        main_scene->presentScene();
    }
    inputThread.join();
}