main.cpp

#include <SFML/System.hpp>
#include <SFML/Window.hpp>
#include <SFML/OpenGL.hpp>
#include <iostream>

const float vertexPositions[] = {
  0.75f, 0.75f, 0.0f, 0.2f,
  0.75f, -0.75f, 0.0f, 0.2f,
  -0.75f, -0.75f, 0.0f, 0.2f,
};

GLuint positionBufferObject;

void setClear() {
  glClearDepth(1.f);
  glClearColor(0.f, 0.f, 0.f, 0.f);
}

void init() {
  glGenBuffers(1, &positionBufferObject);
  glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
  glBufferData(GL_ARRAY_BUFFER, sizeof(vertexPositions), vertexPositions, GL_STATIC_DRAW);
  glBindBuffer(GL_ARRAY_BUFFER, 0);
}

void draw() {
  glBindBuffer(GL_ARRAY_BUFFER, positionBufferObject);
  glEnableVertexAttribArray(0);
  glVertexAttribPointer(0, 4, GL_FLOAT, GL_FALSE, 0, 0);

  glEnableClientState(GL_VERTEX_ARRAY);
  glDrawArrays(GL_TRIANGLES, 0, 2);
  glDisableClientState(GL_VERTEX_ARRAY);

  glDisableVertexAttribArray(0);
}

int main() {
  sf::Clock Clock;

  sf::Window App(sf::VideoMode(800, 600, 32), "SFML Window");

  glEnable(GL_DEPTH_TEST);
  glDepthMask(GL_TRUE);

  // Setup a perspective projection
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(90.f, 1.f, 1.f, 500.f);

  init();
  sf::Event Event;
  while(App.IsOpen()) {
    App.PollEvent(Event);
    if(Event.Type == sf::Event::Closed) {
      App.Close();
    }
    setClear();
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    draw();
    App.Display();
  }

  return 0;
}