系列二：窗体出世

系列一完成后，总想跃跃欲试地看到怎么出现一个窗体

1.窗体的第一个版本

MainGame.h

#pragma once
#include <SDL/SDL.h>
#include <GL/glew.h>

class MainGame
{
public:
    MainGame();
    ~MainGame();

    void run();
    void initSystems();

private:
    SDL_Window* m_pWindow;
    int m_nScreenWidth;
    int m_nScreenHeight;
};

MainGame.cpp

#include "MainGame.h"


MainGame::MainGame() :m_pWindow(nullptr), m_nScreenWidth(1024), m_nScreenHeight(768)
{

}


MainGame::~MainGame()
{
}

void MainGame::run()
{
    initSystems();
}

void MainGame::initSystems()
{
    //Initialize SDL
    SDL_Init(SDL_INIT_EVERYTHING);
    m_pWindow = SDL_CreateWindow("GraphicToturial", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, m_nScreenWidth, m_nScreenHeight, SDL_WINDOW_OPENGL);
}

 

 

2.第一个窗体的版本仅仅是一个无法控制的版本，让咱们加点元素给他，让他能够控制

这里用到了SDL_PollEvent 

当事件为SDL_QUIT：可以退出程序， 为SDL_MOUSEMOTION：可以捕捉鼠标移动的坐标

MainGame.h

#pragma once
#include <SDL/SDL.h>
#include <GL/glew.h>

enum class GameState{PLAY, EXIT};

class MainGame
{
public:
    MainGame();
    ~MainGame();

    void run();
    

private:
    void initSystems();
    void gameLoop();
    void processInput();

    SDL_Window* m_pWindow;
    int m_nScreenWidth;
    int m_nScreenHeight;
    GameState m_gameState;
};

 

 

MainGame.cpp

#pragma once
#include <SDL/SDL.h>
#include <GL/glew.h>

enum class GameState{PLAY, EXIT};

class MainGame
{
public:
    MainGame();
    ~MainGame();

    void run();
    

private:
    void initSystems();
    void gameLoop();
    void processInput();

    SDL_Window* m_pWindow;
    int m_nScreenWidth;
    int m_nScreenHeight;
    GameState m_gameState;
};