/// <summary>
/// Merge this state with another one.
/// </summary>
/// <param name="state">
/// A <see cref="IGraphicsState"/> having the same <see cref="StateIdentifier"/> of this state.
/// </param>
public override void Merge(IGraphicsState state)
{
if (state == null)
{
throw new ArgumentNullException(nameof(state));
}
try {
TransformState otherState = (TransformState)state;
if (otherState.Projection.HasValue)
{
Projection = otherState.Projection.Value;
}
ModelView = ModelView * otherState.ModelView;
if (_ModelViewProjection.HasValue && !otherState.Projection.HasValue)
{
_ModelViewProjection = _ModelViewProjection.Value * otherState.ModelView;
}
else
{
_ModelViewProjection = otherState.ModelViewProjection.Value;
}
Debug.Assert(_ModelViewProjection.HasValue);
Debug.Assert(_ModelViewProjection.Value.Equals((Matrix4x4f)(Projection * ModelView), 1e-3f));
} catch (InvalidCastException) {
throw new ArgumentException("not a TransformState", nameof(state));
}
}
/// <summary>
/// Performs a deep copy of this <see cref="IGraphicsState"/>.
/// </summary>
/// <returns>
/// It returns the equivalent of this <see cref="IGraphicsState"/>, but all objects referenced
/// are not referred by both instances.
/// </returns>
public override IGraphicsState Push()
{
TransformState copiedState = (TransformState)base.Push();
if (_LocalProjection != null)
{
copiedState._LocalProjection = (ProjectionMatrix)_LocalProjection.Clone();
}
copiedState._LocalModel = new ModelMatrix(_LocalModel);
return(copiedState);
}
/// <summary>
/// Merge this state with another one.
/// </summary>
/// <param name="state">
/// A <see cref="IGraphicsState"/> having the same <see cref="StateIdentifier"/> of this state.
/// </param>
public override void Merge(IGraphicsState state)
{
if (state == null)
{
throw new ArgumentNullException("state");
}
TransformState otherState = state as TransformState;
if (otherState == null)
{
throw new ArgumentException("not a TransformState", "state");
}
}