Add SDL to CMake

CMakeLists.txt

@@ -33,3 +33,15 @@ add_executable(robomastersh
 target_link_libraries(robomastersh
     robomaster
 )
+
+find_package(SDL2)
+
+if(SDL2_FOUND)
+    add_executable(robomasterapp
+        src/sdl.c
+    )
+    target_link_libraries(robomasterapp
+        robomaster
+	SDL2::SDL2
+    )
+endif()

src/sdl.c

@@ -0,0 +1,39 @@
+#include "robomaster.h"
+#include "SDL2/SDL.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char* argv[]) {
+    if(SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER) < 0) {
+        fprintf(stderr, "%s", SDL_GetError());
+	return 1;
+    }
+    SDL_Window* win = SDL_CreateWindow(
+		    "Robomaster",
+		    SDL_WINDOWPOS_UNDEFINED,
+		    SDL_WINDOWPOS_UNDEFINED,
+		    800, 300,
+		    SDL_WINDOW_RESIZABLE );
+    if(!win) {
+        fprintf(stderr, "%s", SDL_GetError());
+	return 1;
+    }
+
+    bool quit = false;
+    while(!quit) {
+        SDL_Event event;
+        while(SDL_PollEvent(&event)) {
+            switch(event.type) {
+                case SDL_WINDOWEVENT:
+                    if(event.window.event != SDL_WINDOWEVENT_CLOSE) break;
+                case SDL_QUIT:
+                    quit = true;
+	    }
+	}
+    }
+
+    SDL_Quit();
+    return 0;
+}
+