Load sdl and gl into cling

p.c

#include "cling/Interpreter/Interpreter.h"
#include "SDL2/SDL.h"
#include "GL/gl.h"

SDL_GLContext ctx;
SDL_Window* win;

bool loadSDL();
bool loadGL();

bool sdlLoaded = false;
bool glLoaded = false;

void p()
{
  sdlLoaded = loadSDL();
  if (sdlLoaded)
  {
    gCling->execute("SDL_Init(SDL_INIT_VIDEO);");
  }
  glLoaded = loadGL();

  if (glLoaded && sdlLoaded)
  {
    gCling->execute("win = SDL_CreateWindow(\"Hello Cling\", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1024, 786, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);");
    gCling->execute("ctx = SDL_GL_CreateContext(win)");
  }
}



void swap()
{
    gCling->execute("glEnd(); SDL_GL_SwapWindow(win);");
}

bool loadSDL()
{
  return (gCling->loadLibrary("SDL2") == 
    cling::Interpreter::CompilationResult::kSuccess
  );
}

bool loadGL()
{
  return (gCling->loadLibrary("GL") == 
    cling::Interpreter::CompilationResult::kSuccess
  );
}