Enabled MSAA.

src/main.cc

@@ -150,6 +150,7 @@ int main() {
   glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GLFW_TRUE);
   glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
   glfwWindowHint(GLFW_COCOA_RETINA_FRAMEBUFFER, GLFW_FALSE);
+  glfwWindowHint(GLFW_SAMPLES, 16);
   GLFWwindow* w = glfwCreateWindow(Width, Height, "AnimTestbed", 0, 0);
   glfwMakeContextCurrent(w);
   glfwSwapInterval(1);