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miyoo_a30_playground

My Miyoo A30 playground

Cross compile toolchain gcc

Not tested gcc

lv_port_linux_frame_buffer

> adb push lvgl_demo /tmp
> adb shell
...
# fbset -g 640 640 640 640 32
# killall -KILL main MainUI
# chmod +x /tmp/lvgl_demo
# /tmp/lvgl_demo  
640x640, 32bpp, yoffset=640  
The framebuffer device was mapped to memory successfully.  

#define LV_HOR_RES_MAX          (640)//(480)//(800)
#define LV_VER_RES_MAX          (480)//(640)//(480)//1280)

https://github.com/weimingtom/miyoo_a30_playground/blob/master/lv_port_linux_frame_buffer/lv_drivers/display/fbdev.c

//rotate and flip
//exchange x and y, and flip x
	int32_t x;
	uint32_t *color32 = (uint32_t *)color_p;
	for(y = act_y1; y <= act_y2; ++y) {
	    for (x = act_x1; x <= act_x2; ++x) {
if (y < 0 || y >= vinfo.xres) continue;
if ((vinfo.yres - x - 1) < 0 || (vinfo.yres - x - 1) >= vinfo.yres) continue;

if (x - act_x1 < 0 || x - act_x1 >= (act_x2 - act_x1 + 1)) continue;
if ((y - act_y1) < 0 || (y - act_y1) >= (act_y2 - act_y1 + 1)) continue;

            fbp32[(vinfo.yres - x - 1 + vinfo.yoffset) * vinfo.xres + y] =  
				color32[(act_x2 - act_x1 + 1) * (y - act_y1) + (x - act_x1)]; 
	    }
    }

sdltest for steward-fu/sdl static libsdl.a lib, need libEGL.so and libGLESv2.so (actually libMali.so), my sdl build no sound (?)

  • main.c from src_sdltest.7z of https://github.com/steward-fu/archives/releases?q=miyoo&expanded=true
  • graywin.c from libsdl-1 test code
  • sdl-main.zip from https://github.com/steward-fu/sdl
  • configure command like this: (need uncompress staging_dir.tgz from XK9274/a30-sdk-miyoo releases)
    CFLAGS=-I/home/wmt/work_a30/staging_dir/target/usr/include LDFLAGS=-L/home/wmt/work_a30/staging_dir/target/usr/lib PATH=/home/wmt/work_a30/gcc-linaro-7.5.0-arm-linux-gnueabihf/bin/:$PATH ./configure --prefix=/home/wmt/work_a30/sdl --host=arm-linux-gnueabihf --disable-pulseaudio --enable-video-a30
  • sdl-main patch see sdltest/sdl-main.tar.gz
//src/joystick/a30/SDL_a30_joystick.c:549
        static int xx = 320 / 2;
        static int yy = 240 / 2;
//src/video/a30/SDL_a30_video.c:71, '.rgb' -> '.bgr'
    "    if (s_alpha >= 2.0) {                                 \n"
    "        gl_FragColor = texture2D(s_texture, v_texCoord).bgra;  \n" //ori none
    "    }                                                     \n"
    "    else if (s_alpha > 0.0) {                             \n"
    "        vec3 tex = texture2D(s_texture, v_texCoord).bgr;  \n" //ori .rgb
    "        gl_FragColor = vec4(tex, s_alpha);                \n"
    "    }                                                     \n"
    "    else {                                                \n"
    "        vec3 tex = texture2D(s_texture, v_texCoord).bgr;  \n" //ori .rgb
    "        gl_FragColor = vec4(tex, 1.0);                    \n"
    "    }                                                     \n"
  • Usage:
> adb push graywin /mnt/SDCARD/
> adb push sdltest /mnt/SDCARD/
> adb shell
...
# /mnt/SDCARD/graywin
# /mnt/SDCARD/sdltest

flipClock from https://github.com/JaeSeoKim/sdl-flip-clock

int RenderPresent(SDL_Renderer *renderer, SDL_Window *window) {
#if defined SDL && SDL == 1
  return SDL_BlitSurface(renderer, NULL, window, NULL);
#else

#if 1
//see https://wiki.libsdl.org/SDL2/CategoryAPI
//see https://github.com/EXL/P2kElfs/blob/master/Yeti3D-Old/main_sdl2.c
SDL_UpdateTexture(_G.texture, NULL, _G.video->pixels, _G.video->pitch);
SDL_Rect rect = {0};
rect.x = (480 - 640) / 2; //-80;
rect.y = (640 - 480) / 2; //80;
rect.w = 640 * 1;
rect.h = 480 * 1;
SDL_Point p = {0};
p.x = 640 / 2;//320;
p.y = 480 / 2;//240;
SDL_RenderCopyEx(renderer, _G.texture, NULL, &rect, 270, &p, SDL_FLIP_NONE);
SDL_RenderPresent(renderer);
return 0;
#else

  SDL_RenderPresent(renderer);
  return 0;
#endif
#endif
}

int RenderFillRect(SDL_Renderer *dst, SDL_Rect *rect, Uint32 color) {
#if defined SDL && SDL == 1
  return SDL_FillRect(dst, rect, color);
#else

#if 1
SDL_FillRect(_G.video, rect, color);
#endif

  SDL_SetRenderDrawColor(dst, color >> 16 & 255, color >> 8 & 255, color & 255,
                         color >> 24 & 255);
  return SDL_RenderFillRect(dst, rect);
#endif
}

int RenderClear(SDL_Renderer *dst, Uint32 color) {
#if defined SDL && SDL == 1
  return RenderFillRect(dst, NULL, color);
#else

#if 1
return SDL_FillRect(_G.video, NULL, color);
#else

  SDL_SetRenderDrawColor(dst, color >> 16 & 255, color >> 8 & 255, color & 255,
                         color >> 24 & 255);
  return SDL_RenderClear(dst);
#endif

#endif
}


int BlitSurface(SDL_Surface *src, SDL_Rect *srcrect, SDL_Renderer *dst,
                SDL_Rect *dstrect) {
#if defined SDL && SDL == 1
  return SDL_BlitSurface(src, srcrect, dst, dstrect);
#else

#if 1
int ret = SDL_BlitSurface(src, srcrect, _G.video, dstrect);
return ret;
#else
  SDL_Texture *mTexture = SDL_CreateTextureFromSurface(dst, src);
  if (mTexture == NULL) {
    return -1;
  }
  int ret = SDL_RenderCopy(dst, mTexture, NULL, dstrect);
  SDL_DestroyTexture(mTexture);
  return ret;
#endif

#endif
};
  • src/init.c:
_G.video = SDL_CreateRGBSurface(0, 640, 480, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);
_G.texture = SDL_CreateTexture(_G.renderer, SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING, 640, 480);

不知道SDL_RenderCopyEx的原理是什么，反正好像是可以任意旋转角度，难道是软件实现仿射的吗？
如果这样就有点SDL1代码中影子缓冲的感觉，其实就是软件实现旋转，牺牲一下性能，
不过SDL1的shadow buffer比较麻烦，它是每次产生局部刷新的时候都要仿射一下，
不是说整个屏幕旋转一次

我初步猜测是这样，可能miyoo a30的SDL2程序是通过SDL_RenderCopyEx来旋转，
证据是我比较过我用JaeSeoKim/sdl-flip-clock编译出来的文件和原版掌机上的elf文件，
发现好像改变了这个API名称入口。如图右侧是原版横屏正常版本，
使用SDL_RenderCopyEx旋转回去，当然这只是猜测，以后找时间试验

我想换一种思路去解决SDL_RenderCopyEx旋转90度问题，根据上次的截图，
其实原版的flipClock还多用了这几个API：
SDL_UpdateTexture，SDL_CreateTexture，SDL_UpperBlit（即SDL_BlitSurface）。
SDL_CreateTexture和SDL_BlitSurface应该可以实现类似SDL1影子缓冲的效果
（只需要旋转一次），但目前还没有试验和头绪（最好能找到类似的代码）

(TODO) sdl2test, for testing libSDL2-2.0.so.0 in staging_dir

  • WIP

(TODO) SDL-1.2.15, with shadow buffer rotate

  • WIP
  • TODO:
> adb shell 
# getevent
# cat /dev/input/event3
# getevent /dev/input/event3 -t -l -v

src/video/fbcon/SDL_fbvideo.c
#define FBCON_DEBUG
SDL_VIDEO_FBCON_ROTATION=NONE,CW,CCW,UD

# killall -KILL main MainUI
# fbset -g 640 640 640 640 32
# /mnt/SDCARD/graywin1215 -width 640 -height 480

why use = (0xFF000000 | xxxx) ???

TODO

  • Copy sdl-flip-clock sdl2 include and lib stage files
  • (done)

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