OpenGL with SDL and GLFW

glfw.cpp

// Code taken from GLFW documentation: https://www.glfw.org/documentation.html
#include <GLFW/glfw3.h>

int main(void)
{
    GLFWwindow* window;

    /* Initialize the library */
    if (!glfwInit())
        return -1;

    /* Create a windowed mode window and its OpenGL context */
    window = glfwCreateWindow(640, 480, "Hello World", NULL, NULL);
    if (!window)
    {
        glfwTerminate();
        return -1;
    }

    /* Make the window's context current */
    glfwMakeContextCurrent(window);

    /* Loop until the user closes the window */
    while (!glfwWindowShouldClose(window))
    {
        /* Render here */
        glClear(GL_COLOR_BUFFER_BIT);
      
        // OpenGL rendering goes here

        /* Swap front and back buffers */
        glfwSwapBuffers(window);

        /* Poll for and process events */
        glfwPollEvents();
    }

    glfwTerminate();
    return 0;
}

sdl.cpp

// Code taken from https://gist.github.com/jordandee/94b187bcc51df9528a2f and modified very slightly

#include <SDL2/SDL.h>
#include <SDL2/SDL_opengl.h>
#include <GL/gl.h>

int main (int argc, char** argv)
{
  if (SDL_Init(SDL_INIT_VIDEO) < 0) {
      return -1;
  }
  // Open Window
  SDL_Window* window = SDL_CreateWindow("OpenGL Test", 0, 0, 640, 480, SDL_WINDOW_OPENGL);
  if (!window) {
    return -1;
  }
  // OpenGL attributes
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
  SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 1);
  SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
  // Create OpenGL context
  SDL_GLContext Context = SDL_GL_CreateContext(window);
  
  bool running = true;
  while (running)
  {
    SDL_Event event;
    while (SDL_PollEvent(&event))
    {
      if (event.type == SDL_KEYDOWN)
      {
        switch (event.key.keysym.sym)
        {
          case SDLK_ESCAPE:
            running = false;
            break;
          // Other input here
          default:
            break;
        }
      }
      else if (Event.type == SDL_QUIT)
      {
        running = 0;
      }
    }

    glViewport(0, 0, 640, 480);
    glClearColor(1.f, 0.f, 1.f, 0.f);
    glClear(GL_COLOR_BUFFER_BIT);
    
    // OpenGL rendering goes here
    
    SDL_GL_SwapWindow(window);
  }
  SDL_Quit();
  return 0;
}