SDL

Simple DirectMedia Layer - Homepage

GitHub - rubygame/ruby-sdl-ffi: Ruby-FFI binding to SDL multimedia libraries. (Still in alpha)
GitHub - jacius/nice-ffi: Nice-FFI: Convenience layer atop Ruby-FFI

これちゃんと動く。
しろま日記 : Linux - Ubuntu で初めてのSDLプログラミング
sdl_sample1.c

#include <stdlib.h>
#include <SDL/SDL.h>

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

  SDL_Surface *gScreenSurface;
  SDL_Event ev;

  // 初期化
  if(SDL_Init(SDL_INIT_VIDEO)){
    printf("初期化に失敗したっぽい\n");
    return 1;
  }

  // ウィンドウのタイトルとアイコン(→キャプション)を設定
  SDL_WM_SetCaption("HELLO SDL!", NULL);

  // ウィンドウの初期化
  gScreenSurface = SDL_SetVideoMode(300,200,24,SDL_SWSURFACE);

  // 終了イベント待ち
  while(1){
    SDL_PollEvent(&ev);
    if(ev.type == SDL_QUIT) break;
  }

  SDL_Quit();

  return 0;
}

コンパイルと実行。

$ gcc sdl_sample1.c -lSDL
$ ./a.out

SDL 2.0 日本語リファレンスマニュアル

コンパイルの仕方とか。
How to compile an example SDL program written in C? - Stack Overflow
　

SDL2

ははあ、わかったぞ。サンプルコード。
sdl2_sample1.c

#include <stdlib.h>
#include <SDL2/SDL.h>

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

    SDL_Window *window;                    // Declare a pointer

    SDL_Init(SDL_INIT_VIDEO);              // Initialize SDL2

    // Create an application window with the following settings:
    window = SDL_CreateWindow(
        "An SDL2 window",                  // window title
        SDL_WINDOWPOS_UNDEFINED,           // initial x position
        SDL_WINDOWPOS_UNDEFINED,           // initial y position
        640,                               // width, in pixels
        480,                               // height, in pixels
        SDL_WINDOW_OPENGL                  // flags - see below
    );

    // Check that the window was successfully created
    if (window == NULL) {
        // In the case that the window could not be made...
        printf("Could not create window: %s\n", SDL_GetError());
        return 1;
    }

    // The window is open: could enter program loop here (see SDL_PollEvent())

    SDL_Delay(3000);  // Pause execution for 3000 milliseconds, for example

    // Close and destroy the window
    SDL_DestroyWindow(window);

    // Clean up
    SDL_Quit();
    return 0;
}

コンパイルと実行。

$ gcc sdl2_sample1.c -lSDL2
$ ./a.out

ちなみに SDL2 は /usr/include にあった。

sdl2_sample2.c

#include <SDL2/SDL.h>

int main(int argc, char* argv[])
{
    if (SDL_Init(SDL_INIT_VIDEO) == 0) {
        SDL_Window* window = NULL;
        SDL_Renderer* renderer = NULL;

        if (SDL_CreateWindowAndRenderer(640, 480, 0, &window, &renderer) == 0) {
            SDL_bool done = SDL_FALSE;

            while (!done) {
                SDL_Event event;

                SDL_SetRenderDrawColor(renderer, 0, 0, 0, SDL_ALPHA_OPAQUE);
                SDL_RenderClear(renderer);

                SDL_SetRenderDrawColor(renderer, 255, 255, 255, SDL_ALPHA_OPAQUE);
                SDL_RenderDrawLine(renderer, 320, 200, 300, 240);
                SDL_RenderDrawLine(renderer, 300, 240, 340, 240);
                SDL_RenderDrawLine(renderer, 340, 240, 320, 200);
                SDL_RenderPresent(renderer);

                while (SDL_PollEvent(&event)) {
                    if (event.type == SDL_QUIT) {
                        done = SDL_TRUE;
                    }
                }
            }
        }

        if (renderer) {
            SDL_DestroyRenderer(renderer);
        }
        if (window) {
            SDL_DestroyWindow(window);
        }
    }
    SDL_Quit();
    return 0;
}

sdl2_gfx で円を描く方法。
Draw a filled circle with SDL2_gfx in C/C++ - Stack Overflow

はてなブックマーク - SDL2に関するmieki256のブックマーク

SDL2_gfx: SDL2_gfx - Graphics primitives and surface functions for SDL2