52 lines
1.3 KiB
C#
52 lines
1.3 KiB
C#
|
using OpenTK.Mathematics;
|
||
|
|
|
||
|
|
namespace Dashboard.Drawing.OpenGL
|
||
|
|
{
|
||
|
|
/// <summary>
|
||
|
|
/// The current stack of transformations.
|
||
|
|
/// </summary>
|
||
|
|
public class TransformStack
|
||
|
|
{
|
||
|
|
private Matrix4 _top = Matrix4.Identity;
|
||
|
|
private readonly Stack<Matrix4> _stack = new Stack<Matrix4>();
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The top-most transform matrix.
|
||
|
|
/// </summary>
|
||
|
|
public ref readonly Matrix4 Top => ref _top;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// The number of matrices in the stack.
|
||
|
|
/// </summary>
|
||
|
|
public int Count => _stack.Count;
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Push a transform.
|
||
|
|
/// </summary>
|
||
|
|
/// <param name="transform">The transform to push.</param>
|
||
|
|
public void Push(in Matrix4 transform)
|
||
|
|
{
|
||
|
|
_stack.Push(_top);
|
||
|
|
_top = transform * _top;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Pop a transform.
|
||
|
|
/// </summary>
|
||
|
|
public void Pop()
|
||
|
|
{
|
||
|
|
if (!_stack.TryPop(out _top))
|
||
|
|
_top = Matrix4.Identity;
|
||
|
|
}
|
||
|
|
|
||
|
|
/// <summary>
|
||
|
|
/// Clear the stack of transformations.
|
||
|
|
/// </summary>
|
||
|
|
public void Clear()
|
||
|
|
{
|
||
|
|
_stack.Clear();
|
||
|
|
_top = Matrix4.Identity;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|