SDL2贴图初探1

SDL2贴图初探1

SDL2改动比较大，随便玩玩高手勿喷。此代码是官方wiki给出的。
地址:http://wiki.libsdl.org/SDL_CreateRenderer

#include "SDL.h"

int main( int argc,  char *argv[]) {
    SDL_Window *win = NULL;
    SDL_Renderer *renderer = NULL;
    SDL_Texture *bitmapTex = NULL;
    SDL_Surface *bitmapSurface = NULL;
     int posX = 100, posY = 100, width = 320, height = 240;

    SDL_Init(SDL_INIT_VIDEO);

    win = SDL_CreateWindow("Hello World", posX, posY, width, height, 0);

    renderer = SDL_CreateRenderer(win, -1, SDL_RENDERER_ACCELERATED);

    bitmapSurface = SDL_LoadBMP("img/hello.bmp");
    bitmapTex = SDL_CreateTextureFromSurface(renderer, bitmapSurface);
    SDL_FreeSurface(bitmapSurface);

     while (1) {
        SDL_Event e;
         if (SDL_PollEvent(&e)) {
             if (e.type == SDL_QUIT) {
                 break;
            }
        }

        SDL_RenderClear(renderer);
        SDL_RenderCopy(renderer, bitmapTex, NULL, NULL);
        SDL_RenderPresent(renderer);
    }

    SDL_DestroyTexture(bitmapTex);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(win);

    SDL_Quit();

     return 0;
}

下面看看SDL Game Development给出的代码，我摘录了一小段

     if(m_pRenderer != 0)
            {
                cout<<"renderer creation success\n";
                SDL_SetRenderDrawColor(m_pRenderer,0,0,0,255);
                m_pTexture = SDL_CreateTextureFromSurface(m_pRenderer,pTempSurface);
                SDL_FreeSurface(pTempSurface);
                SDL_QueryTexture(m_pTexture,NULL,NULL,&m_sourceRectangle.w,&m_sourceRectangle.h);
                m_sourceRectangle.w=50;
                m_sourceRectangle.h=50;

                m_destinationRectangle.x=m_sourceRectangle.x=0;
                m_destinationRectangle.y=m_sourceRectangle.y=0;
                m_destinationRectangle.x=100;
                m_destinationRectangle.y=100;
                m_sourceRectangle.x=50;
                m_sourceRectangle.y=50;
                m_destinationRectangle.w=m_sourceRectangle.w;
                m_destinationRectangle.h=m_sourceRectangle.h;

            }

1  void Game::render()
2 {
3     SDL_RenderClear(m_pRenderer);
4      // SDL_RenderCopy(m_pRenderer,m_pTexture,&m_sourceRectangle,&m_destinationRectangle);
5      SDL_RenderCopy(m_pRenderer,m_pTexture,NULL,NULL);
6     SDL_RenderPresent(m_pRenderer);
7 }

截图如下: