掌機 - Miyoo A30 - C/C++ - SDL v2.0 - Rotate Text


main.c

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#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>
#include <SDL2_gfxPrimitives.h>
  
int main(int argc, char **argv)
{
    const int w = 640;
    const int h = 480;
    const int bpp = 32;
    SDL_Window *window = NULL;
    SDL_Renderer *renderer = NULL;
  
    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("main", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
 
    SDL_RenderClear(renderer);
    gfxPrimitivesSetFontRotation(135);
    stringRGBA(renderer, h / 2, w / 2, "hello, world!", 0xff, 0xff, 0xff, 0xff);
    SDL_RenderPresent(renderer);
  
    SDL_Delay(3000);
  
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

編譯、執行 

$ /opt/a30/bin/arm-linux-gcc \
    -I/opt/a30/arm-a30-linux-gnueabihf/sysroot/usr/include/SDL2 \
    -lSDL2 -lSDL2_gfx -lSDL2_image -lSDL2_ttf -lSDL2_mixer \
    -lGLESv2 main.c -o main

/mnt/SDCARD# export LD_LIBRARY_PATH=.:/config/lib:/customer/lib:/usr/miyoo/lib
/mnt/SDCARD# ./main