用 SDL2 显示一张图片
来源：
http://adolfans.github.io/sdltutorialcn/ （中文教程）
http://www.willusher.io/pages/sdl2/ （英文教程）
环境：SDL2 + VC++2015
下面的代码将打开一个窗口显示hello.bmp
1 #include <iostream> 2 #include <SDL.h> 3 4 int main(int argc, char** argv) 5 { 6 //初始化SDL 7 if (SDL_Init(SDL_INIT_VIDEO) != 0) 8 { 9 std::cout << "SDL_Init Error: " << SDL_GetError() << std::endl; 10 return 1; 11 } 12 13 //创建窗口 14 SDL_Window *win = nullptr; 15 win = SDL_CreateWindow("Hello World!", 16 SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 17 640, 480, SDL_WINDOW_SHOWN); 18 if (win == nullptr) 19 { 20 std::cout << SDL_GetError() << std::endl; 21 return 1; 22 } 23 24 //创建渲染器 25 SDL_Renderer *ren = nullptr; 26 ren = SDL_CreateRenderer(win, -1, 27 SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); 28 if (ren == nullptr) 29 { 30 std::cout << SDL_GetError() << std::endl; 31 return 1; 32 } 33 34 //创建表面 35 SDL_Surface *bmp = nullptr; 36 bmp = SDL_LoadBMP("hello.bmp"); 37 if (bmp == nullptr) { 38 std::cout << SDL_GetError() << std::endl; 39 return 1; 40 } 41 42 //创建材质 43 SDL_Texture *tex = nullptr; 44 tex = SDL_CreateTextureFromSurface(ren, bmp); 45 SDL_FreeSurface(bmp); 46 47 //清空渲染器 48 SDL_RenderClear(ren); 49 //将材质复制到渲染器 50 SDL_RenderCopy(ren, tex, NULL, NULL); 51 //呈现渲染器 52 SDL_RenderPresent(ren); 53 //窗口延时 54 SDL_Delay(2000); 55 56 //释放资源 57 SDL_DestroyTexture(tex); 58 SDL_DestroyRenderer(ren); 59 SDL_DestroyWindow(win); 60 //退出SDL 61 SDL_Quit(); 62 63 return 0; 64 }
