Function Draw

test/browser/test_glfw.c:361–406

}

void Draw(void) {
  int width, height, x;
  double t;

  t = glfwGetTime ();
  glfwGetMousePos (&x, NULL);

  // Get window size (may be different than the requested size)
  glfwGetWindowSize (&width, &height);

  // Special case: avoid division by zero below
  height = height > 0 ? height : 1;

  glViewport (0, 0, width, height);
  // Clear color buffer to black
  glClearColor (0.1f, 0.2f, 0.3f, 0.0f);
  glClear (GL_COLOR_BUFFER_BIT);

  // Select and setup the projection matrix
  glMatrixMode (GL_PROJECTION);
  glLoadIdentity ();
  gluPerspective (65.0f, (GLfloat) width / (GLfloat) height, 1.0f, 100.0f);

  // Select and setup the modelview matrix
  glMatrixMode (GL_MODELVIEW);
  glLoadIdentity ();
  gluLookAt (0.0f, 1.0f, 0.0f,  // Eye-position
       0.0f, 20.0f, 0.0f, // View-point
       0.0f, 0.0f, 1.0f); // Up-vector

  // Draw a rotating colorful triangle
  //glTranslatef (0.0f, 14.0f, 0.0f);
  glTranslatef (0.0f, 1.0f, 0.0f);
  glRotatef (0.3f * (GLfloat) x + (GLfloat) t * 100.0f, 0.0f, 0.0f, 1.0f);
  glBegin (GL_TRIANGLES);
  glColor3f (1.0f, 0.0f, 0.0f);
  glVertex3f (-5.0f, 0.0f, -4.0f);
  glColor3f (0.0f, 1.0f, 0.0f);
  glVertex3f (5.0f, 0.0f, -4.0f);
  glColor3f (0.0f, 0.0f, 1.0f);
  glVertex3f (0.0f, 0.0f, 6.0f);
  glEnd ();

  // Swap buffers
  glfwSwapBuffers ();
}

// the time of the previous frame
double old_time;