#include <cstdio>
#include <iostream>

#include <GL/glew.h>
#include <GLFW/glfw3.h>

using namespace std;

int main(int argc, char* argv[]) {
   cout << "New OpenGL Game" << endl;

   if (!glfwInit()) {
      fprintf(stderr, "ERROR: could not start GLFW3\n");
      return 1;
   }	

   GLFWwindow* window = glfwCreateWindow(640, 480, "Hello Triangle", NULL, NULL);
   if (!window) {
      fprintf(stderr, "ERROR: could not open window with GLFW3\n");
      glfwTerminate();
      return 1;
   }
   glfwMakeContextCurrent	(window);
   glewExperimental = GL_TRUE;
   glewInit();

   const GLubyte* renderer = glGetString(GL_RENDERER);
   const GLubyte* version = glGetString(GL_VERSION);
   printf("Renderer: %s\n", renderer);
   printf("OpenGL version supported %s\n", version);
   glEnable(GL_DEPTH_TEST);
   glDepthFunc(GL_LESS);

   GLfloat points[] = {
      0.0f,  0.5f,  0.0f,
      0.5f, -0.5f,  0.0f,
     -0.5f, -0.5f,  0.0f,
   };

   GLuint vbo = 0;
   glGenBuffers(1, &vbo);
   glBindBuffer(GL_ARRAY_BUFFER, vbo);
   glBufferData(GL_ARRAY_BUFFER, sizeof(points), points, GL_STATIC_DRAW);

   GLuint vao=0;
   glGenVertexArrays(1, &vao);
   glBindVertexArray(vao);
   glEnableVertexAttribArray(0);
   glBindBuffer(GL_ARRAY_BUFFER, vbo);
   glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, NULL);

   glfwTerminate();
   return 0;
}