#pragma once #include <SDL2/SDL.h> #include <SDL2/SDL_keycode.h> #include <SDL2/SDL_rect.h> #include <SDL2/SDL_render.h> #include <SDL2/SDL_video.h> #include <cmath> #include <functional> #include <memory> #include <string> #include <utility> #include "api/Camera.h" #include "api/Color.h" #include "api/Event.h" #include "api/KeyCodes.h" #include "api/Sprite.h" #include "api/Texture.h" #include "api/Transform.h" #include "types.h" namespace crepe { class LoopManager; class InputSystem; /** * \class SDLContext * \brief Facade for the SDL library * * SDLContext is a singleton that handles the SDL window and renderer, provides methods for * event handling, and rendering to the screen. It is never used directly by the user */ class SDLContext { public: struct RenderContext { const Sprite & sprite; const Camera & cam; const vec2 & cam_pos; const vec2 & pos; const double & angle; const double & scale; }; public: //! EventType enum for passing eventType enum EventType { NONE = 0, MOUSEDOWN, MOUSEUP, MOUSEMOVE, MOUSEWHEEL, KEYUP, KEYDOWN, SHUTDOWN, }; //! EventData struct for passing event data from facade struct EventData { SDLContext::EventType event_type = SDLContext::EventType::NONE; Keycode key = Keycode::NONE; bool key_repeat = false; MouseButton mouse_button = MouseButton::NONE; ivec2 mouse_position = {-1, -1}; int scroll_direction = -1; float scroll_delta = INFINITY; ivec2 rel_mouse_move = {-1, -1}; }; /** * \brief Gets the singleton instance of SDLContext. * \return Reference to the SDLContext instance. */ static SDLContext & get_instance(); SDLContext(const SDLContext &) = delete; SDLContext(SDLContext &&) = delete; SDLContext & operator=(const SDLContext &) = delete; SDLContext & operator=(SDLContext &&) = delete; private: //! will only use get_events friend class InputSystem; /** * \brief Retrieves a list of all events from the SDL context. * * This method retrieves all the events from the SDL context that are currently * available. It is primarily used by the InputSystem to process various * input events such as mouse clicks, mouse movements, and keyboard presses. * * \return Events that occurred since last call to `get_events()` */ std::vector<SDLContext::EventData> get_events(); /** * \brief Converts an SDL key code to the custom Keycode type. * * This method maps an SDL key code to the corresponding `Keycode` enum value, * which is used internally by the system to identify the keys. * * \param sdl_key The SDL key code to convert. * \return The corresponding `Keycode` value or `Keycode::NONE` if the key is unrecognized. */ Keycode sdl_to_keycode(SDL_Keycode sdl_key); /** * \brief Converts an SDL mouse button code to the custom MouseButton type. * * This method maps an SDL mouse button code to the corresponding `MouseButton` * enum value, which is used internally by the system to identify mouse buttons. * * \param sdl_button The SDL mouse button code to convert. * \return The corresponding `MouseButton` value or `MouseButton::NONE` if the key is unrecognized */ MouseButton sdl_to_mousebutton(Uint8 sdl_button); private: //! Will only use get_ticks friend class AnimatorSystem; //! Will only use delay friend class LoopTimer; /** * \brief Gets the current SDL ticks since the program started. * \return Current ticks in milliseconds as a constant uint64_t. */ uint64_t get_ticks() const; /** * \brief Pauses the execution for a specified duration. * * This function uses SDL's delay function to halt the program execution for a given number * of milliseconds, allowing for frame rate control or other timing-related functionality. * * \param ms Duration of the delay in milliseconds. */ void delay(int ms) const; private: /** * \brief Constructs an SDLContext instance. * Initializes SDL, creates a window and renderer. */ SDLContext(); /** * \brief Destroys the SDLContext instance. * Cleans up SDL resources, including the window and renderer. */ ~SDLContext(); private: //! Will use the funtions: texture_from_path, get_width,get_height. friend class Texture; /** * \brief Loads a texture from a file path. * \param path Path to the image file. * \return Pointer to the created SDL_Texture. */ std::unique_ptr<SDL_Texture, std::function<void(SDL_Texture *)>> texture_from_path(const std::string & path); /** * \brief Gets the size of a texture. * \param texture Reference to the Texture object. * \return Width and height of the texture as an integer. */ ivec2 get_size(const Texture & ctx); private: //! Will use draw,clear_screen, present_screen, camera. friend class RenderSystem; /** * \brief Draws a sprite to the screen using the specified transform and camera. * \param RenderCtx Reference to rendering data to draw */ void draw(const RenderContext & ctx); //! Clears the screen, preparing for a new frame. void clear_screen(); //! Presents the rendered frame to the screen. void present_screen(); /** * \brief sets the background of the camera (will be adjusted in future PR) * \param camera Reference to the Camera object. */ void set_camera(const Camera & camera); private: /** * \brief calculates the sqaure size of the image * * \param sprite Reference to the sprite to calculate the rectangle * \return sdl rectangle to draw a src image */ SDL_Rect get_src_rect(const Sprite & sprite) const; /** * \brief calculates the sqaure size of the image for destination * * \param sprite Reference to the sprite to calculate rectangle * \param pos the pos in world units * \param cam the camera of the current scene * \param cam_pos the current postion of the camera * \param img_scale the image multiplier for increasing img size * \return sdl rectangle to draw a dst image to draw on the screen */ SDL_Rect get_dst_rect(const Sprite & sprite, const vec2 & pos, const Camera & cam, const vec2 & cam_pos, const double & img_scale) const; /** * \brief Set an additional color value multiplied into render copy operations. * * \param texture the given texture to adjust * \param color the color data for the texture */ void set_color_texture(const Texture & texture, const Color & color); private: //! sdl Window std::unique_ptr<SDL_Window, std::function<void(SDL_Window *)>> game_window; //! renderer for the crepe engine std::unique_ptr<SDL_Renderer, std::function<void(SDL_Renderer *)>> game_renderer; }; } // namespace crepe