sdl2-2.04 读取位图并显示

最新推荐文章于 2024-05-15 18:29:37 发布

转载最新推荐文章于 2024-05-15 18:29:37 发布 · 123 阅读

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CC 4.0 BY-SA版权

原文链接：http://www.cnblogs.com/agnt/p/5134245.html

本文介绍了一个使用SDL2库创建简单窗口并显示图片的基本示例。通过初始化SDL库、设置视频模式、加载位图文件、将位图绘制到窗口表面等步骤，实现了基本的图形显示功能，并通过监听键盘事件来控制程序退出。

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// sdl2_win32.cpp : Defines the entry point for the console application.
//
// 假定SDL的库文件和头文件和VC的工程文件在一起.
#include "stdafx.h"
#include "SDL2-2.0.4/include/SDL.h"
#pragma comment(lib, "SDL2-2.0.4/lib/x86/sdl2.lib")

#include <iostream>

void pressESCtoQuit();

int _tmain(int argc, _TCHAR* argv[])
{
   try {
       if ( SDL_Init(SDL_INIT_VIDEO) != 0 )
           throw SDL_GetError();
   }
   catch ( const char* s ) {
       std::cerr << "SDL_Init() failed!\n" << s << std::endl;
       return -1;
   }

   const int SCREEN_WIDTH = 640;    // 0 means use current width.
   const int SCREEN_HEIGHT = 480;    // 0 means use current height.
   const int SCREEN_BPP = 32;        // 0 means use current bpp.
   const Uint32 SCREEN_FLAGS = SDL_SWSURFACE;    // SDL_SWSURFACE == 0,surface in system memory.

   SDL_Surface* pScreen = 0;
   SDL_Window* win = SDL_CreateWindow("title", 0,0,SCREEN_WIDTH, SCREEN_HEIGHT, SCREEN_FLAGS); // SDL1.X叫SDL_SetVideoMode()
   pScreen = SDL_GetWindowSurface(win); // 相比SDL1.X多一步
   try {
       if ( pScreen == 0 )
           throw SDL_GetError();
   }
   catch ( const char* s ) {
       std::cerr << "SDL_SetVideoMode() failed!\n" << s << std::endl;
       SDL_Quit();
       return -1;
   }

   SDL_Surface* pShownBMP = 0;
   pShownBMP = SDL_LoadBMP("hello.bmp"); // Load a BMP file, and convert it as a surface.
   try {
       if ( pShownBMP == 0 )
           throw SDL_GetError();
   }
   catch ( const char* s ) {
       std::cerr << "SDL_LoadBMP() failed!\n" << s << std::endl;
       SDL_Quit();
       return -1;
   }

   SDL_Rect* pSrcRect = 0;    // If pSrcRect is NULL, the entire source surface is copied.

   SDL_Rect* pDstRect = 0;    // If pDstRect is NULL, then the destination position (upper left corner) is (0, 0).
   try {
       if ( SDL_BlitSurface(pShownBMP, pSrcRect, pScreen, pDstRect) != 0 )    // Put the BMP's surface on the SDL window's surface.
           throw SDL_GetError();
   }
   catch ( const char* s ) {
       std::cerr << "SDL_BlitSurface() failed!\n" << s << std::endl;
       SDL_Quit();
       return -1;
   }

   try {
       if ( SDL_UpdateWindowSurface(win) != 0 )    // Show the SDL window's surface. SDL1.X叫SDL_Flip
          throw SDL_GetError();
   }
   catch ( const char* s ) {
       std::cerr << "SDL_Flip() failed!\n" << s << std::endl;
       SDL_Quit();
       return -1;
   }

   pressESCtoQuit();
   SDL_Quit();

   return 0;
}

void pressESCtoQuit()
{
   bool gameOver = false;
   while( gameOver == false ){
       SDL_Event gameEvent;
       while ( SDL_PollEvent(&gameEvent) != 0 ){
           if ( gameEvent.type == SDL_QUIT ){
               gameOver = true;
           }
           if ( gameEvent.type == SDL_KEYUP ){
               if ( gameEvent.key.keysym.sym == SDLK_ESCAPE ){
                   gameOver = true;
               }
           }
       }
   }
   return;
}