/**
* Indicates whether this element is enabled in the given default state for a particular action.
*/
public static boolean isEnabled(State state) {
return (state.getDefaults().getElement(index) != null);
}
/** Returns the instance of this element in the passed State. */
public static ModelMatrixElement getInstance(State state) {
return (ModelMatrixElement) state.getElement(index);
}
/** Enables this element in the passed state, which should be the default for a given action. */
public static void enable(State defaultState) {
Element tmp = new ModelMatrixElement();
defaultState.setElement(tmp.getStateIndex(), tmp);
}
/** Represents the model matrix, which is the transformation applied to objects in the scene. */
public class ModelMatrixElement extends Element {
// Boilerplate
private static StateIndex index = State.registerElementType();
public StateIndex getStateIndex() {
return index;
}
public Element newInstance() {
return new ModelMatrixElement();
}
/** Returns the instance of this element in the passed State. */
public static ModelMatrixElement getInstance(State state) {
return (ModelMatrixElement) state.getElement(index);
}
/** Enables this element in the passed state, which should be the default for a given action. */
public static void enable(State defaultState) {
Element tmp = new ModelMatrixElement();
defaultState.setElement(tmp.getStateIndex(), tmp);
}
/**
* Indicates whether this element is enabled in the given default state for a particular action.
*/
public static boolean isEnabled(State state) {
return (state.getDefaults().getElement(index) != null);
}
// The matrix data
protected Mat4f matrix;
protected Mat4f temp = new Mat4f();
public ModelMatrixElement() {
matrix = new Mat4f();
matrix.makeIdent();
}
public void push(State state) {
ModelMatrixElement prev = (ModelMatrixElement) getNextInStack();
if (prev != null) {
matrix.set(prev.matrix);
}
}
/**
* Returns the current model matrix; callers should not mutate this directly but instead use the
* accessor methods to change it.
*/
public Mat4f getMatrix() {
return matrix;
}
/** Sets the current element to the identity matrix. */
public static void makeIdent(State state) {
ModelMatrixElement elt = getInstance(state);
elt.makeEltIdent();
}
/** Sets this element to the identity matrix. */
public void makeEltIdent() {
matrix.makeIdent();
}
/** Multiplies the current element by the given matrix. */
public static void mult(State state, Mat4f matrix) {
ModelMatrixElement elt = getInstance(state);
elt.multElt(matrix);
}
/** Multiplies this element by the given matrix. */
public void multElt(Mat4f matrix) {
temp.set(this.matrix);
this.matrix.mul(temp, matrix);
}
}