game/sdlpp.hpp

#ifndef SDLPP_HPP
#define SDLPP_HPP

#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <iostream>
#include <memory>
#include <vector>

namespace SDLPP {

class Window {
public:
    Window() : Window("SDL Window", 640, 480, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED) {
    }
    Window(const std::string &window_name) : Window(window_name, 640, 480, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED) {
    }
    Window(const std::string &window_name, uint32_t width, uint32_t height) : Window(window_name, width, height, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED) {}
    Window(const std::string &window_name, uint32_t width, uint32_t height,
           uint32_t posx, uint32_t posy) {
        window = SDL_CreateWindow(window_name.c_str(), posx, posy, width, height, SDL_WINDOW_SHOWN);
        if( window == NULL ) {
            std::cerr << "SDL could not create a window! SDL_Error: " << SDL_GetError() << std::endl;
            throw "Couldn't create window";
        }
    }
    ~Window() {
        SDL_DestroyWindow(window);
    }
    SDL_Window *getWindowPtr() {
        return window;
    }
private:
    SDL_Window *window = NULL;
};

class Renderer {
public:
    Renderer() = delete;
    Renderer(Window &window) {
        renderer = SDL_CreateRenderer(window.getWindowPtr(), -1, SDL_RENDERER_ACCELERATED);
        if(renderer == NULL ) {
            std::cerr << "SDL could not create a renderer! SDL_Error: " << SDL_GetError();
            throw "Couldn't create renderer";
        }
        SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);
    }
    ~Renderer() {
        SDL_DestroyRenderer(renderer);
    }
    SDL_Renderer *getRendererPtr() {
        return renderer;
    }
    std::pair<int, int> getDimensions() {
        int width = 0, height = 0;
        SDL_GetRendererOutputSize(renderer, &width, &height);
        return {width, height};
    }
private:
    SDL_Renderer *renderer = NULL;
};

class Texture {
public:
    Texture() = delete;
    Texture(std::shared_ptr<Renderer> &renderer, const std::string &img_path) : Texture(renderer, img_path, "") {}
    Texture(std::shared_ptr<Renderer> &renderer, const std::string &img_path, const std::string &color_key) {
        SDL_Surface *surface = IMG_Load(img_path.c_str());
        if( surface == NULL ) {
            std::cerr << "Unable to load image '" << img_path << "': IMG Error: " << IMG_GetError() << std::endl;
            throw "IMG_Load error";
        }
        if( !color_key.empty() ) {
            auto colors = getColorsHEX(color_key);
            SDL_SetColorKey(surface, SDL_TRUE, SDL_MapRGB(surface->format, std::get<0>(colors), std::get<1>(colors), std::get<2>(colors)));
        }
        texture = SDL_CreateTextureFromSurface(renderer->getRendererPtr(), surface);
        if( texture == NULL ) {
            std::cerr << "Unable to create texture from '" << img_path << "'! SDL Error: " << SDL_GetError() << std::endl;
            throw "Texture error";
        }
        SDL_FreeSurface(surface);
    }
    ~Texture() {
        SDL_DestroyTexture(texture);
    }
    SDL_Texture *getTexturePtr() {
        return texture;
    }
private:
    int hex2num(char c) {
        if(c <= '9')
            return c - '0';
        switch(c) {
            case 'a':
            case 'A':
                return 10;
            case 'b':
            case 'B':
                return 11;
            case 'c':
            case 'C':
                return 12;
            case 'd':
            case 'D':
                return 13;
            case 'e':
            case 'E':
                return 14;
            default:
                return 15;
        }
    }

    std::tuple<int, int, int> getColorsHEX(const std::string &color) {
        int red = 0, green = 0, blue = 0;
        const char *color_ptr = color.c_str();
        if(color_ptr[0] == '#')
            color_ptr++;
        red = hex2num(color_ptr[0])*16 + hex2num(color_ptr[1]);
        green = hex2num(color_ptr[2])*16 + hex2num(color_ptr[3]);
        blue = hex2num(color_ptr[4])*16 + hex2num(color_ptr[5]);
        return {red, green, blue};
    }

    SDL_Texture *texture = NULL;
};

class CollisionPolygon {
public:
    CollisionPolygon(double x, double y) {
        original_x = x;
        original_y = y;
        position_x = 0;
        position_y = 0;
    }
    virtual ~CollisionPolygon() {}
    virtual bool colidesWith(const CollisionPolygon &other) const = 0;
    virtual bool isCircle() const = 0;
    virtual bool isInfinite() const = 0;
    virtual int topmost() const = 0;
    virtual int bottommost() const = 0;
    virtual int leftmost() const = 0;
    virtual int rightmost() const = 0;
    virtual void updateCollision(int x, int y, int w, int h) {
        position_x = original_x * w + x;
        position_y = original_y * h + y;
    }
    int getX() const {
        return position_x;
    }
    int getY() const {
        return position_y;
    }
protected:
    double original_x;
    double original_y;
    int position_x;
    int position_y;
};

class RenderObject {
public:
    RenderObject(std::shared_ptr<Renderer> &r) : renderer(r) {}
    virtual ~RenderObject() {}
    virtual void render() = 0;
    virtual int leftmost() = 0;
    virtual int topmost() = 0;
    virtual int collisionPushX() = 0;
    virtual int collisionPushY() = 0;
    virtual int collisionWidth() = 0;
    virtual int collisionHeight() = 0;
    bool colidesWith(const RenderObject &other) const {
        if(!hasCollisions() || !other.hasCollisions()) {
            return false;
        }
        for( const auto &x : collisions ) {
            for( const auto &y : other.getCollisions() ) {
                if(x->colidesWith(*y))
                    return true;
            }
        }
        return false;
    }
    template<class T>
    void addCollision(const T &p) {
        collisions.push_back(std::make_shared<T>(p));
        collisions.back()->updateCollision(collisionPushX(), collisionPushY(), collisionWidth(), collisionHeight());
    }
    bool hasCollisions() const {
        return !collisions.empty();
    }
    const std::vector<std::shared_ptr<CollisionPolygon>> &getCollisions() const {
        return collisions;
    }
    void setTexture(std::shared_ptr<Texture> &t) {
        texture = t;
    }
    void setTexture(const std::string &img_path) {
        texture = std::make_shared<Texture>(renderer, img_path);
    }
    // per second, relative to window width
    void setMovementSpeed(double speed) {
        movementSpeed = speed;
    }
    void addMovement(int x, int y) {
        movementDirection.first += x;
        movementDirection.second += y;
    }
    void clearColided() {
        colidedWith.clear();
    }
    void addColided(std::shared_ptr<RenderObject> &obj) {
        colidedWith.push_back(obj);
    }
    std::vector<std::shared_ptr<RenderObject>> &getColidedWith() {
        return colidedWith;
    }
    void setId(uint64_t input_id) {
        id = input_id;
    }
    uint64_t getId() {
        return id;
    }
    virtual void move(int ticks) = 0;
    virtual void updateSizeAndPosition() = 0;
protected:
    std::vector<std::shared_ptr<CollisionPolygon>> collisions;
    std::shared_ptr<Texture> texture;
    std::shared_ptr<Renderer> renderer;
    double movementSpeed;
    std::pair<int,int> movementDirection;
    std::vector<std::shared_ptr<RenderObject>> colidedWith;
    uint64_t id;
};

class Scene {
public:
    Scene(std::shared_ptr<Renderer> &r) : renderer(r) {
        SDL_SetRenderDrawColor(renderer->getRendererPtr(), 0xFF, 0xFF, 0xFF, 0xFF);
        prev_ticks = SDL_GetTicks();
    }
    template<class T>
    void addObject(std::shared_ptr<T> &obj) {
        renderObjects.push_back(obj);
        if(obj->hasCollisions()) {
            collisionObjects.push_back(obj);
        }
    }
    std::shared_ptr<RenderObject> getObject(int index) {
        return renderObjects[index];
    }
    void movement() {
        int now_ticks = SDL_GetTicks();
        for( const auto &x : renderObjects ) {
            x->move(now_ticks - prev_ticks);
        }
        prev_ticks = now_ticks;
    }
    std::vector<std::shared_ptr<RenderObject>> getCollisions(RenderObject &r) {
        std::vector<std::shared_ptr<RenderObject>> ret{};
        for(const auto &x : collisionObjects) {
            if(x->colidesWith(r)) {
                ret.push_back(x);
            }
        }
        return ret;
    }
    void renderScene() {
        SDL_RenderClear(renderer->getRendererPtr());
        SDL_RenderCopy(renderer->getRendererPtr(), background->getTexturePtr(), NULL, NULL);
        for( const auto &x : renderObjects ) {
            x->render();
        }
    }
    void presentScene() {
        SDL_RenderPresent(renderer->getRendererPtr());
    }
    void setBackground(std::shared_ptr<Texture> bg) {
        background = bg;
    }
    void setBackground(const std::string &img_path) {
        background = std::make_shared<Texture>(renderer, img_path);
    }
    void updateSizeAndPosition() {
        for( auto &x : renderObjects ) {
            x->updateSizeAndPosition();
        }
    }
private:
    std::vector<std::shared_ptr<RenderObject>> renderObjects;
    std::vector<std::shared_ptr<RenderObject>> collisionObjects;
    std::shared_ptr<Renderer> renderer;
    std::shared_ptr<Texture> background;
    int prev_ticks = 0;
};

class RectangleRender : public RenderObject {
public:
    RectangleRender() = delete;
    virtual ~RectangleRender() {};
    RectangleRender(double x, double y, double w, double h, std::shared_ptr<Renderer> &r) : RenderObject(r) {
        auto dimensions = renderer->getDimensions();
        auto smaller_dimension = dimensions.first < dimensions.second ? dimensions.first : dimensions.second;
        rect.x = x * dimensions.first;
        rect.y = y * dimensions.second;
        rect.w = w * smaller_dimension;
        rect.h = h * smaller_dimension;
        x_ = x;
        y_ = y;
        w_ = w;
        h_ = h;
    }
    RectangleRender(int x, int y, int w, int h, std::shared_ptr<Renderer> &r, std::shared_ptr<Texture> &t) : RectangleRender(x, y, w, h, r) {
        setTexture(t);
    }
    RectangleRender(int x, int y, int w, int h, std::shared_ptr<Renderer> &r, const std::string &img_path) : RectangleRender(x,y,w,h,r) {
        auto texture = std::make_shared<Texture>(r, img_path);
        setTexture(texture);
    }
    virtual void render() {
        SDL_RenderCopy(renderer->getRendererPtr(), texture->getTexturePtr(), NULL, &rect);
    }
    virtual void move(int ticks) {
        auto dimensions = renderer->getDimensions();
        auto addx = static_cast<double>(movementSpeed * movementDirection.first)*(static_cast<double>(ticks)/1000);
        auto addy = static_cast<double>(movementSpeed * movementDirection.second)*(static_cast<double>(ticks)/1000);
        x_ += addx;
        y_ += addy;
        rect.x = x_ * dimensions.first;
        rect.y = y_ * dimensions.second;
        for( auto &x : collisions ) {
            x->updateCollision(collisionPushX(), collisionPushY(), collisionWidth(), collisionHeight());
        }
    }
    virtual int leftmost() {
        return rect.x;
    }
    virtual int topmost() {
        return rect.y;
    }
    virtual int collisionPushX() {
        return rect.x;
    }
    virtual int collisionPushY() {
        return rect.y;
    }
    virtual int collisionWidth() {
        return rect.w;
    }
    virtual int collisionHeight() {
        return rect.h;
    }
    virtual void updateSizeAndPosition() {
        auto dimensions = renderer->getDimensions();
        auto smaller_dimension = dimensions.first < dimensions.second ? dimensions.first : dimensions.second;
        rect.x = x_ * dimensions.first;
        rect.y = y_ * dimensions.second;
        rect.w = w_ * smaller_dimension;
        rect.h = h_ * smaller_dimension;
    }
private:
    double x_;
    double y_;
    double w_;
    double h_;
    SDL_Rect rect;
};

class CircleRender : public RenderObject {
public:
    CircleRender() = delete;
    virtual ~CircleRender() {};
    CircleRender(int x, int y, int rad, std::shared_ptr<Renderer> &r) : RenderObject(r) {
        x_ = x;
        y_ = y;
        rad_ = rad;
    }
    CircleRender(int x, int y, int rad, std::shared_ptr<Renderer> &r, std::shared_ptr<Texture> &t) : CircleRender(x,y,rad,r) {
        setTexture(t);
    }
    CircleRender(int x, int y, int rad, std::shared_ptr<Renderer> &r, const std::string &img_path) : CircleRender(x,y,rad,r) {
        auto texture = std::make_shared<Texture>(r, img_path);
        setTexture(texture);
    }
    virtual void render();
    virtual int leftmost() {
        return x_-rad_;
    }
    virtual int topmost() {
        return y_-rad_;
    }
    virtual int collisionPushX() {
        return x_;
    }
    virtual int collisionPushY() {
        return y_;
    }
private:
    int x_;
    int y_;
    int rad_;
};

class Rect : public CollisionPolygon {
public:
    Rect(int x, int y, int w, int h) : CollisionPolygon(x, y) {
        w_ = w;
        h_ = h;
    }
    virtual ~Rect() {}
    virtual bool colidesWith(const CollisionPolygon &other) const override;
    virtual bool isCircle() const override { return false; }
    virtual bool isInfinite() const override { return false; }
    virtual int topmost() const override { return getY(); }
    virtual int bottommost() const override { return getY() + pixel_h; };
    virtual int leftmost() const override { return getX(); }
    virtual int rightmost() const override { return getX() + pixel_w; }
    virtual void updateCollision(int x, int y, int w, int h) override {
        position_x = original_x * w + x;
        position_y = original_y * h + y;
        pixel_w = w_ * w;
        pixel_h = h_ * h;
    }
private:
    double w_;
    double h_;
    int pixel_w;
    int pixel_h;
};

class Circle : public CollisionPolygon {
public:
    Circle(int x, int y, int rad) : CollisionPolygon(x, y) {
        rad_ = rad;
    }
    virtual ~Circle() {}
    virtual bool colidesWith(const CollisionPolygon &other) const;
    virtual bool isCircle() const { return true; }
    virtual bool isInfinite() const { return false; }
    virtual int topmost() const { return getY() - rad_; }
    virtual int bottommost() const { return getY() + rad_; };
    virtual int leftmost() const { return getX() - rad_; }
    virtual int rightmost() const { return getX() + rad_; }
private:
    int getRadius() const {
        return rad_;
    }
    int rad_;
};

bool init();
bool init(uint32_t SDL_OPTIONS);
bool init(uint32_t SDL_OPTIONS, int IMAGE_OPTIONS);

template<class T>
void testPolymorphism(T &obj);

} // end of namespace SDLPP

#endif