2dkg/2dgk_7/2dgk_7/KGame.cpp

#include "KGame.h"
#include "SDL.h"
#include <nlohmann/json.hpp>
#include <cstdio>
#include <cmath>
#include <string>
#include <fstream>
#include <vector>

#include "Utils.h"
#include "Constants.h"
#include "KTexture.h"
#include "KTile.h"
#include "KVector2d.h"

namespace KapitanGame {
	KGame::KGame() : HasSeparation(true), HasCollision(true) {
		//Initialize SDL
		if (SDL_Init(SDL_INIT_VIDEO) < 0)
		{
			throw std::runtime_error(Utils::StringFormat("SDL could not initialize! SDL_Error: %s", SDL_GetError()));
		}
		//Set texture filtering to linear
		if (!SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1"))
		{
			printf("Warning: Linear texture filtering not enabled!\n");
		}

		Input.Init();

		//Create window
		Window = SDL_CreateWindow(Constants::WINDOW_TITLE, SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, Constants::SCREEN_WIDTH, Constants::SCREEN_HEIGHT, SDL_WINDOW_SHOWN);
		if (Window == nullptr)
		{
			throw std::runtime_error(Utils::StringFormat("Window could not be created! SDL_Error: %s", SDL_GetError()));
		}
		//Create renderer for window
		Renderer = SDL_CreateRenderer(Window, -1, SDL_RENDERER_ACCELERATED);
		if (Renderer == nullptr)
		{
			throw std::runtime_error(Utils::StringFormat("Renderer could not be created! SDL Error: %s", SDL_GetError()));
		}
		//Initialize renderer color
		SDL_SetRenderDrawColor(Renderer, 0, 0xFF, 0, 0xFF);
	}

	KGame::~KGame() {
		//Free loaded images

		CircleTexture.Free();

		Input.Free();

		//Destroy window    
		SDL_DestroyRenderer(Renderer);
		SDL_DestroyWindow(Window);
		Window = nullptr;
		Renderer = nullptr;

		//Quit SDL subsystems
		SDL_Quit();
	}

	bool KGame::LoadMedia()
	{
		//Loading success flag
		bool success = true;

		if (!PlayerTexture.LoadFromFile("assets/textures/P1.bmp", Renderer))
		{
			printf("Failed to load player texture image!\n");
			success = false;
		}
		if (!PlayerTexture2.LoadFromFile("assets/textures/P2.bmp", Renderer))
		{
			printf("Failed to load player texture image!\n");
			success = false;
		}
		if (!WallTexture.LoadFromFile("assets/textures/wall.bmp", Renderer))
		{
			printf("Failed to load wall texture image!\n");
			success = false;
		}
		if (!ExitTexture.LoadFromFile("assets/textures/exit.bmp", Renderer))
		{
			printf("Failed to load exit texture image!\n");
			success = false;
		}

		std::ifstream configFile("config.json");
		if (configFile.fail()) {
			printf("Failed to load config.json!\n");
			success = false;
		}
		else {
			nlohmann::json configJson;
			configFile >> configJson;
			configFile.close();
			for (auto& player : configJson["Input"].items()) {
				const auto playerEnum = Utils::GetPlayerFromString(player.key());
				for (auto& axisMapping : player.value()["AxisMappings"]) {
					Input.AddAxisMapping(axisMapping["AxisName"].get<std::string>(), axisMapping["Scale"].get<float>(), axisMapping["Key"].get<std::string>(), playerEnum);
				}
				for (auto& actionMapping : player.value()["ActionMappings"]) {
					Input.AddActionMapping(actionMapping["ActionName"].get<std::string>(), actionMapping["Key"].get<std::string>(), playerEnum);
				}
			}
		}

		Tiles.clear();
		std::ifstream levelFile;
		levelFile.open("assets/level1.txt");
		if (levelFile.fail())
		{
			printf("Failed to load assets/level1.txt!\n");
			success = false;
		}
		else
		{
			int y = 0;
			std::string line;
			while (std::getline(levelFile, line)) {
				if (MapWidth < static_cast<int>(line.length() * Constants::TILE_WIDTH))
					MapWidth = static_cast<int>(line.length()) * Constants::TILE_WIDTH;
				for (auto i = 0ull; i < line.length(); ++i) {
					auto type = TileType::Default;
					switch (line[i])
					{
					case '#':
						type = TileType::Wall;
						break;
					default:
						continue;
					}
					Tiles.emplace_back(i * Constants::TILE_WIDTH, y * Constants::TILE_HEIGHT, type);
				}
				++y;
			}
			MapHeight = y * Constants::TILE_HEIGHT;
			levelFile.close();
		}
		return success;
	}

	SDL_Texture* KGame::LoadTexture(const std::string& path) const {
		//The final optimized image
		SDL_Texture* newTexture = nullptr;

		//Load image at specified path
		SDL_Surface* loadedSurface = SDL_LoadBMP(path.c_str());
		if (loadedSurface == nullptr)
		{
			printf("Unable to load image %s! SDL Error: %s\n", path.c_str(), SDL_GetError());
		}
		else
		{
			//Create texture from surface pixels
			newTexture = SDL_CreateTextureFromSurface(Renderer, loadedSurface);
			if (newTexture == nullptr)
			{
				printf("Unable to optimize image %s! SDL Error: %s\n", path.c_str(), SDL_GetError());
			}

			//Get rid of old loaded surface
			SDL_FreeSurface(loadedSurface);
		}

		return newTexture;
	}

	int KGame::Run(int argc, char* args[])
	{
		//Load media
		if (!LoadMedia())
		{
			printf("Failed to load media!\n");
		}
		else
		{
			//Main loop flag
			bool quit = false;

			//Event handler
			SDL_Event e;

			SDL_Rect map{ 0,0,Constants::SCREEN_WIDTH, Constants::SCREEN_HEIGHT };

			for (int i = 0; i < Constants::CIRCLES_COUNT; ++i) {
				KVector2D position(Utils::RandomNumber() * (Constants::SCREEN_WIDTH - 2 * CircleTexture.GetWidth()) + CircleTexture.GetWidth(), Utils::RandomNumber() * (Constants::SCREEN_HEIGHT - 2 * CircleTexture.GetHeight()) + CircleTexture.GetHeight());
				Circles.emplace_back(position, KVector2D(100.f, 100.f), CircleTexture.GetWidth() / 2, CircleTexture);
			}
			uint32_t previousTime;
			uint32_t time = previousTime = SDL_GetTicks();
			printf("\n");

			//While application is running
			while (!quit)
			{
				previousTime = time;
				time = SDL_GetTicks();

				Input.HandleInputPreEvents();

				//Handle events on queue
				while (SDL_PollEvent(&e))
				{
					//User requests quit
					if (e.type == SDL_QUIT)
					{
						quit = true;
						continue;
					}
					Input.HandleEvent(e);
				}
				Input.HandleInputPostEvents();

				if (Input.IsKeyboardButtonPressed(SDL_SCANCODE_S) || Input.IsControllerButtonPressed(Controllers::Controller1, SDL_CONTROLLER_BUTTON_START))
				{
					HasSeparation = !HasSeparation;
				}
				if (Input.IsKeyboardButtonPressed(SDL_SCANCODE_C) || Input.IsControllerButtonPressed(Controllers::Controller1, SDL_CONTROLLER_BUTTON_BACK))
				{
					HasCollision = !HasCollision;
				}


				for (auto& circle : Circles)
					circle.CollisionDetectionStep(Circles, HasSeparation, HasCollision);

				for (auto& circle : Circles)
					circle.CollisionDetectionWithMapStep(map);

				for (auto& circle : Circles)
					circle.MovementStep(static_cast<float>(time - previousTime) / 1000.f);

				//Clear screen
				SDL_SetRenderDrawColor(Renderer, 0, 0xFF, 0, 0xFF);
				SDL_RenderClear(Renderer);

				for (auto& circle : Circles)
					circle.Render(Renderer);

				//Update screen
				SDL_RenderPresent(Renderer);
			}
		}

		return 0;
	}
}