SDL2.0的加载图片贴图

加载图片贴图，采用了SDL_Window、SDL_Renderer、SDL_Texture和SDL_Image库

实例：

 #include <stdio.h>

 #include <math.h>

 #include <string.h>

 #include <SDL2\SDL.h>

 #include <SDL2\SDL_image.h>

 #include <SDL2\ex\SDL_rectex.h>

 SDL_Window *sdlWindow = NULL;

 SDL_Renderer *sdlRender = NULL;

 SDL_Texture *sdlTexture = NULL;

 SDL_Rect srcRect;

 SDL_Rect dstRect;

 int w = ;

 int h = ;

 bool InitView(int width, int height, const char *iconName)

 {

     //初始化窗体

     SDL_Init(SDL_INIT_VIDEO);

     sdlWindow = SDL_CreateWindow(

         "The First SDL Program",

         SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, width, height,

         SDL_WINDOW_RESIZABLE);

     if (sdlWindow == NULL) return false;

     //加载窗体图标

     SDL_Surface *iconSurface = IMG_Load(iconName);

     if (iconSurface == NULL) return false;

     SDL_SetWindowIcon(sdlWindow, iconSurface);

     return true;

 }

 bool InitDraw(const char *imgName)

 {

     //加载渲染器

     sdlRender = SDL_CreateRenderer(sdlWindow, -, );

     if (sdlRender == NULL) return false;

     SDL_SetRenderDrawColor(sdlRender, , , , );

     //加载绘画图片

     SDL_Surface *sdlSurface = IMG_Load(imgName);

     if (sdlSurface == NULL) return false;

     //加载绘画纹理

     sdlTexture = SDL_CreateTextureFromSurface(sdlRender, sdlSurface);

     if (sdlTexture == NULL) return false;

     SDL_FreeSurface(sdlSurface);

     return true;

 }

 void UpdateDraw()

 {

     SDL_RenderClear(sdlRender);

     //分X宫格

     const int count = ;

     const int sqrtCount = (int)sqrt((double)count);

     for (int i = ; i < sqrtCount; i++)    {

         srcRect = SDL_RectMake(, , (w-sqrtCount)/sqrtCount, (h-sqrtCount)/sqrtCount);

         for (int j = ; j < sqrtCount; j++) {

             srcRect.x = srcRect.w*j+(j?*j:);

             srcRect.y = srcRect.h*i+(i?*i:);

             //SDL_RectPrint("srcRect", srcRect);

             SDL_RectCopy(&srcRect, &dstRect);

             //SDL_RectPrint("dstRect", dstRect);

             SDL_RenderCopy(sdlRender, sdlTexture, &srcRect, &dstRect);

         }

     }

     SDL_RenderPresent(sdlRender);

 }

 void Quit(int code)

 {

     const char *errMsg = SDL_GetError();

     if (errMsg && strlen(errMsg)) {

         SDL_Log("Error : %s\n", errMsg);

     }

     //销毁窗口、渲染器、纹理

     if (sdlWindow) SDL_DestroyWindow(sdlWindow);

     if (sdlRender) SDL_DestroyRenderer(sdlRender);

     if (sdlTexture) SDL_DestroyTexture(sdlTexture);

     SDL_Quit();

     exit(code);

 }

 void HandleKeyEvent(const SDL_Keysym* keysym)

 {

     int key = keysym->sym;

     switch(key)

     {

     case SDLK_ESCAPE:

         Quit();

         break;

     case SDLK_SPACE:

         break;

     case SDLK_UP:

     case SDLK_DOWN:

     case SDLK_LEFT:

     case SDLK_RIGHT:

         int x, y;

         SDL_GetWindowPosition(sdlWindow, &x, &y);

         x = (key == SDLK_LEFT ? x- : (key == SDLK_RIGHT ? x+ : x));

         y = (key == SDLK_UP ? y- : (key == SDLK_DOWN ? y+ : y));

         SDL_SetWindowPosition(sdlWindow, x, y);

         SDL_Log("x=%d, y=%d\n", x, y);

         break;

     case SDLK_KP_PLUS:

     case SDLK_KP_MINUS:

         w = (key == SDLK_KP_PLUS ? w+ : w-);

         h = (key == SDLK_KP_PLUS ? h+ : h-);

         SDL_SetWindowSize(sdlWindow, w, h);

         SDL_Log("w=%d, h=%d\n", w, h);

         break;

     default:

         break;

     }

 }

 void HandleEvents()

 {

     //Our SDL event placeholder.

     SDL_Event event;

     //Grab all the events off the queue.

     while(SDL_PollEvent(&event)) {

         switch(event.type) {

         case SDL_KEYDOWN:

             //Handle key Event

             HandleKeyEvent(&event.key.keysym);

             break;

         case SDL_QUIT:

             //Handle quit requests (like Ctrl-c).

             Quit();

             break;

         }

     }

 }

 int main(int argc, char* argv[])

 {

     printf("可以通过↑↓←→+ -按键控制移动和大小\n");

     if (InitView(w, h, "yp.ico") == false) {

         SDL_Log("sdlWindow is null @_@\n");

         Quit();

         return -;

     }

     char *imgName = "gril.jpg";

     if (InitDraw(imgName) == false) {

         SDL_Log("Init Fail @_@\n");

         Quit();

         return -;

     }

     //配置客户区大小

     SDL_QueryTexture(sdlTexture,NULL, NULL, &w, &h);

     SDL_SetWindowSize(sdlWindow, w, h);

     SDL_Log("w=%d, h=%d\n", w, h);

     while () {

         HandleEvents();

         UpdateDraw();

     }

     SDL_DestroyWindow(sdlWindow);

     SDL_Quit();

     return ;

 }

结果：