title: Triangle drawing order in DirectX/OpenGL
body: <p>Is the order of drawing triangles in a 3D APIs guaranteed to be the same as their order in the index buffer?</p>
  <p>For example if I have two overlapping triangles in a single draw call, and depth testing is disabled, will the first or second triangle be visible in the end?</p>
  <p>Or do I need to issue separate draw calls to be sure that the 2nd triangle appears on top of the 1st?</p>