func TestStackNew(t *testing.T) {
stack := NewTransformStack()
if !(*stack)[0].ApproxEqual(mgl64.Ident4()) {
t.Errorf("Cannot construct stack correctly")
}
}
func TestStackPushPopPeek(t *testing.T) {
stack := NewTransformStack()
if !stack.Peek().ApproxEqual(mgl64.Ident4()) {
t.Errorf("Peek not working")
}
stack.Push(mgl64.HomogRotate3DY(mgl64.DegToRad(90)))
if !stack.Peek().ApproxEqual(mgl64.HomogRotate3DY(mgl64.DegToRad(90))) {
t.Errorf("Peek not working")
}
if stack.Len() != 2 {
t.Errorf("Peek alters stack length")
}
pop, err := stack.Pop()
if err != nil || !pop.ApproxEqual(mgl64.HomogRotate3DY(mgl64.DegToRad(90))) {
t.Errorf("Pop is unsuccessful")
}
if stack.Len() != 1 {
t.Errorf("Pop does not actually shorten stack")
}
_, err = stack.Pop()
if err == nil {
t.Errorf("Popping stack with 1 element does not return error as expected")
}
}
// A shortcut for Load(mgl.Ident4())
func (ms *MatStack) LoadIdent() {
(*ms)[len(*ms)-1] = mgl64.Ident4()
}
func NewMatStack() *MatStack {
return &MatStack{mgl64.Ident4()}
}
// Returns a matrix stack where the top element is the identity.
func NewTransformStack() *TransformStack {
ms := make(TransformStack, 1)
ms[0] = mgl64.Ident4()
return &ms
}