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[ART smart 开发板] SDL测试

发布于 2022-06-26 23:36:18 浏览：683 订阅该版

关于SDL2的移植我参考的是这个大佬的文章，他的教程也得到官方背书了，被官方放到教程里面去了。
![VF6T10(A`E~R}[1A]THP0(1.png](https://oss-club.rt-thread.org/uploads/20220626/50fa4dcfa52089b708d61bec52398d55.png "VF6T10(A`E~R}[1A]THP0(1.png")
 
 https://club.rt-thread.org/ask/article/ea69b90a0e576dfa.html
 
 https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-smart/application-note/sdl2_ffmpeg/sdl2_ffmpeg
 
 p.s 本文的环境是基于linux的，ubuntu20.04
 
 1、因为新版本的ART-Pi-smart，改了一下库的路径，但是里面一些脚本还没有做同步的更新，所以需要我们手动去修改一下脚本适配一下。
  首先先进入ART-Pi-smar 所在的目录
  `gedit userapps/gnu-apps/sdl/build_sdl.sh
  ![RD[{%P[]J)L2{N~EF%PJ5EW.png](https://oss-club.rt-thread.org/uploads/20220626/2d73f03851654b966a0436199ae8488a.png.webp "RD[{%P[]J)L2{N~EF%PJ5EW.png")
  
  此时在重新执行一下 ./build_sdl.sh 即可，如果需要用到的buidl_test.sh的话同样进去修改即可。
  
  还有按照那个大佬的文章，里面关于makefile脚本的那一段，在链接库的时候少链接了sdl，所以如果完全按照那篇文章来执行的话会报错，提示没有找到相应的函数定义，需要做如下修改
  ![M%W0`MN[V[_BE(M_U6)_TGY.png](https://oss-club.rt-thread.org/uploads/20220626/3918da509b654d037f135b4e70d3a878.png.webp "M%W0`MN[V[_BE(M_U6)_TGY.png")
  
  跑一下大佬的程序
  ![IMG_20220626_230130.jpg](https://oss-club.rt-thread.org/uploads/20220626/74b01c413e54d4a285febbb55d724e90.jpg.webp "IMG_20220626_230130.jpg")
  
  自己写的一个demo，本来想基于此来控制硬件点灯啥的，但不知道为啥加入rtthread.h头文件就会报错，用linux控制io的方式好像也不行，就放弃，实现触摸屏幕会改变方框的颜色。
  ![1656256596021.jpg](https://oss-club.rt-thread.org/uploads/20220626/085c984a0b2419f026e6981e9f4cb262.jpg.webp "1656256596021.jpg")
  
  ```c
#include <SDL.h>
#include <stdio.h>
#include <signal.h>

extern Uint32 rtt_screen_width;
extern Uint32 rtt_screen_heigth;

static SDL_Rect rect = { 100, 100, 30, 30};

void signalHandler( int signum )
{
    printf("Interrupt signal %d  received.\n", signum);

SDL_Quit();

// exit(signum);  
}

int main(void)
{
    signal(SIGINT, signalHandler);  //ctrl+c  signalHandler
    //The window we'll be rendering to
    SDL_Window* window = NULL;

//The surface contained by the window
    SDL_Renderer *renderer;

//use dummy video driver
    SDL_setenv("SDL_VIDEODRIVER","rtt",1);
    //Initialize SDL
    if( SDL_Init( SDL_INIT_VIDEO ) < 0 )
    {
        printf( "SDL could not initialize! SDL_Error: %s\n", SDL_GetError() );
        return -1;
    }

window = SDL_CreateWindow( "Home", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, rtt_screen_width, rtt_screen_heigth, SDL_WINDOW_SHOWN );
    if( window == NULL )
    {
        printf( "Window could not be created! SDL_Error: %s\n", SDL_GetError() );
        return -1;
    }

renderer = SDL_CreateRenderer(window, -1, 0);

SDL_Surface *surface = SDL_LoadBMP("home.bmp");
    SDL_Texture *texture = SDL_CreateTextureFromSurface(renderer, surface);
    SDL_SetRenderTarget(renderer, texture);
    SDL_RenderCopy(renderer, texture, NULL, NULL);

SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
    // SDL_RenderDrawLine(renderer, 0, 0,320, 200);

//SDL_RenderDrawLine(renderer, 320, 0, 320, 480);
    // SDL_RenderDrawLines(renderer, points, POINTS_COUNT);
    SDL_RenderDrawRect(renderer, &rect);

SDL_RenderPresent(renderer);

while(1)
    {
        SDL_Event event;
        if(SDL_PollEvent(&event) >= 0)
        {
            if(event.type == SDL_QUIT)
                goto end;
            else if(event.type == SDL_FINGERDOWN)
            {
                SDL_SetRenderDrawColor(renderer, 255, 0, 0, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawRect(renderer, &rect);
                SDL_RenderPresent(renderer);
            }
            else if(event.type == SDL_FINGERUP)
            {
                SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawRect(renderer, &rect);
                SDL_RenderPresent(renderer);
            }
        }
    }

end:
    //destory renderer
    if (renderer) {
        SDL_DestroyRenderer(renderer);
    }
     //Destroy window
    SDL_DestroyWindow( window );

//Quit SDL subsystems
    SDL_Quit();

return 0;
}

```