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Chapter5: Play and Exit buttons
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‎Chapter5.1/SDL_game.sln

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Microsoft Visual Studio Solution File, Format Version 12.00
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# Visual Studio 15
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VisualStudioVersion = 15.0.28307.645
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MinimumVisualStudioVersion = 10.0.40219.1
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Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "SDL_game", "SDL_game\SDL_game.vcxproj", "{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|x64 = Debug|x64
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Debug|x86 = Debug|x86
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Release|x64 = Release|x64
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Release|x86 = Release|x86
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EndGlobalSection
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GlobalSection(ProjectConfigurationPlatforms) = postSolution
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Debug|x64.ActiveCfg = Debug|x64
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Debug|x64.Build.0 = Debug|x64
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Debug|x86.ActiveCfg = Debug|Win32
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Debug|x86.Build.0 = Debug|Win32
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Release|x64.ActiveCfg = Release|x64
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Release|x64.Build.0 = Release|x64
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Release|x86.ActiveCfg = Release|Win32
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{9CF7E47B-7AD3-4297-9BC4-76D4652359C5}.Release|x86.Build.0 = Release|Win32
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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EndGlobalSection
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GlobalSection(ExtensibilityGlobals) = postSolution
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SolutionGuid = {62EC434C-F3A8-4ECE-8EF9-A9120020982B}
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EndGlobalSection
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EndGlobal

‎Chapter5.1/SDL_game/Enemy.cpp

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#include "Enemy.h"
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Enemy::Enemy(const LoaderParams* pParams) : SDLGameObject(pParams)
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{
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}
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void Enemy::draw()
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{
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SDLGameObject::draw(); // we now use SDLGameObject
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}
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void Enemy::update()
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{
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m_position.setX(m_position.getX() + 1);
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m_position.setY(m_position.getY() + 1);
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m_currentFrame = int(((SDL_GetTicks() / 100) % 6));
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}
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void Enemy::clean()
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{
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}
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‎Chapter5.1/SDL_game/Enemy.h

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#pragma once
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#include "SDLGameObject.h"
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class Enemy : public SDLGameObject
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{
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public:
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Enemy(const LoaderParams* pParams);
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virtual void draw();
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virtual void update();
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virtual void clean();
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};
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‎Chapter5.1/SDL_game/Game.cpp

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#include <SDL.h>
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#include <SDL_image.h>
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#include "Game.h"
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#include "InputHandler.h"
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#include "MenuState.h"
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#include "PlayState.h"
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Game* Game::s_pInstance = 0;
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bool Game::init(const char *title, int xpos, int ypos, int height, int width, int flags)
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{
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if (SDL_Init(SDL_INIT_EVERYTHING) >= 0) {
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m_pWindow = SDL_CreateWindow(title, xpos, ypos, height, width, flags);
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if (m_pWindow != 0)
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{
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m_pRenderer = SDL_CreateRenderer(m_pWindow, -1, 0);
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m_pGameStateMachine = new GameStateMachine();
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m_pGameStateMachine->changeState(new MenuState());
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TheTextureManager::Instance()->load("assets/animate-alpha.png", "animate", m_pRenderer);
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//m_gameObjects.push_back(new Player(new LoaderParams(100, 100, 128, 82, "animate")));
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//m_gameObjects.push_back(new Enemy(new LoaderParams(300, 300, 128, 82, "animate")));
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m_bRunning = true;
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return true;
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}
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}
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return false;
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}
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void Game::render()
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{
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SDL_SetRenderDrawColor(m_pRenderer, 0, 100, 0, 255);
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SDL_RenderClear(m_pRenderer);
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m_pGameStateMachine->render();
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for (vector<GameObject*>::size_type i = 0; i != m_gameObjects.size(); i++)
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{
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m_gameObjects[i]->draw();
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}
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SDL_RenderPresent(m_pRenderer);
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}
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void Game::update()
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{
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for (vector<GameObject*>::size_type i = 0; i != m_gameObjects.size(); i++)
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{
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m_gameObjects[i]->update();
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}
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m_pGameStateMachine->update();
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}
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void Game::handleEvents()
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{
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TheInputHandler::Instance()->update();
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if (TheInputHandler::Instance()->isKeyDown(SDL_SCANCODE_RETURN))
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{
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m_pGameStateMachine->changeState(new PlayState());
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}
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}
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void Game::clean()
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{
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SDL_DestroyRenderer(m_pRenderer);
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SDL_DestroyWindow(m_pWindow);
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}
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bool Game::running() { return m_bRunning; }
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void Game::quit() {
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m_bRunning = false;
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}

‎Chapter5.1/SDL_game/Game.h

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#pragma once
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#ifndef __GAME__
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#define __GAME__
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#include <SDL.h>
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#include <vector>
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#include "TextureManager.h"
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#include "GameObject.h"
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#include "Player.h"
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#include "Enemy.h"
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#include "GameStateMachine.h"
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enum game_states
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{
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MENU = 0,
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PLAY = 1,
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GAMEOVER = 2
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};
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class Game
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{
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public:
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bool init(const char *title, int xpos, int ypos, int height, int width, int flags);
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void render();
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void update();
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void handleEvents();
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void clean();
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bool running();
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void quit();
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int m_currentFrame;
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GameObject *m_go;
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GameObject *m_player;
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GameObject *m_enemy;
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vector<GameObject*> m_gameObjects;
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static Game *Instance()
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{
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if (s_pInstance == 0)
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{
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s_pInstance = new Game();
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return s_pInstance;
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}
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return s_pInstance;
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}
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SDL_Renderer* getRenderer() const { return m_pRenderer; }
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private:
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SDL_Window* m_pWindow;
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SDL_Renderer* m_pRenderer;
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bool m_bRunning;
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static Game *s_pInstance;
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GameStateMachine *m_pGameStateMachine;
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};
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typedef Game TheGame;
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#endif // !__GAME__
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‎Chapter5.1/SDL_game/GameObject.cpp

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#include "GameObject.h"
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#include "TextureManager.h"
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void GameObject::draw() { cout << "draw game object"; }
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void GameObject::update() { cout << "update game object"; }
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void GameObject::clean() { cout << "clean game object"; }

‎Chapter5.1/SDL_game/GameObject.h

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#pragma once
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#ifndef __GAMEOBJECT__
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#define __GAMEOBJECT__
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#include <iostream>
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#include <SDL.h>
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#include "LoaderParams.h"
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using namespace std;
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class GameObject
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{
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public:
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virtual void draw();
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virtual void update();
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virtual void clean();
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protected:
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GameObject(const LoaderParams *pParams) {}
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virtual ~GameObject() {}
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};
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#endif // !__GAMEOBJECT__
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‎Chapter5.1/SDL_game/GameState.h

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#pragma once
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#ifndef __GAMESTATE__
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#define __GAMESTATE__
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#include <iostream>
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#include <string>
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using namespace std;
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class GameState
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{
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public:
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virtual void update() = 0;
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virtual void render() = 0;
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virtual bool onEnter() = 0;
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virtual bool onExit() = 0;
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virtual string getStateID() const = 0;
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};
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#endif // !__GAMESTATE__
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‎Chapter5.1/SDL_game/GameStateMachine.cpp

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#include "GameStateMachine.h"
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void GameStateMachine::pushState(GameState * pState)
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{
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m_gameStates.push_back(pState);
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m_gameStates.back()->onEnter();
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}
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void GameStateMachine::changeState(GameState * pState)
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{
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if (!m_gameStates.empty())
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{
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if (m_gameStates.back()->getStateID() == pState->getStateID())
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{
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return; // do nothing
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}
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if (m_gameStates.back()->onExit())
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{
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delete m_gameStates.back();
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m_gameStates.pop_back();
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}
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}
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m_gameStates.push_back(pState);
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m_gameStates.back()->onEnter();
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}
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void GameStateMachine::popState()
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{
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if (!m_gameStates.empty())
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{
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if (m_gameStates.back()->onExit())
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{
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delete m_gameStates.back();
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m_gameStates.pop_back();
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}
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}
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}
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void GameStateMachine::update()
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{
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if (!m_gameStates.empty())
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{
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m_gameStates.back()->update();
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}
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}
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void GameStateMachine::render()
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{
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if (!m_gameStates.empty())
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{
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m_gameStates.back()->render();
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}
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}

‎Chapter5.1/SDL_game/GameStateMachine.h

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#pragma once
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#ifndef __GAMESTATEMACHINE__
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#define __GAMESTATEMACHINE__
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#include <vector>
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#include"GameState.h"
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class GameStateMachine
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{
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public:
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void pushState(GameState *pState);
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void changeState(GameState *pState);
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void popState();
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void update();
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void render();
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private:
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vector<GameState *> m_gameStates;
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};
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#endif // !__GAMESTATEMACHINE__
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