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Diffstat (limited to 'Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/Effects/MatrixChainEffect.cs')
| -rw-r--r-- | Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/Effects/MatrixChainEffect.cs | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/Effects/MatrixChainEffect.cs b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/Effects/MatrixChainEffect.cs new file mode 100644 index 0000000..046479f --- /dev/null +++ b/Plugins/MonoGame.Extended/source/MonoGame.Extended.Graphics/Effects/MatrixChainEffect.cs @@ -0,0 +1,155 @@ +using System.Collections.Specialized; +using Microsoft.Xna.Framework; +using Microsoft.Xna.Framework.Graphics; + +namespace MonoGame.Extended.Graphics.Effects +{ + /// <summary> + /// An <see cref="Effect" /> that uses the standard chain of matrix transformations to represent a 3D object on a 2D + /// monitor. + /// </summary> + /// <seealso cref="Effect" /> + /// <seealso cref="IEffectMatrices" /> + public abstract class MatrixChainEffect : Effect, IMatrixChainEffect + { + /// <summary> + /// The bitmask for use with <see cref="Flags"/> indicating wether <see cref="World"/>, <see cref="View"/>, or <see cref="Projection"/> has changed in the last frame. + /// </summary> + protected static int DirtyWorldViewProjectionBitMask = BitVector32.CreateMask(); + + /// <summary> + /// The bitmask for use with <see cref="Flags"/> indicating wether to use a default projection matrix or a custom projection matrix. + /// </summary> + protected static int UseDefaultProjectionBitMask = BitVector32.CreateMask(DirtyWorldViewProjectionBitMask); + + /// <summary> + /// The dirty flags associated with this <see cref="MatrixChainEffect"/>. + /// </summary> + protected BitVector32 Flags; + + private Matrix _projection = Matrix.Identity; + private Matrix _view = Matrix.Identity; + private Matrix _world = Matrix.Identity; + private EffectParameter _matrixParameter; + + /// <summary> + /// Gets or sets the model-to-world <see cref="Matrix" />. + /// </summary> + /// <value> + /// The model-to-world <see cref="Matrix" />. + /// </value> + public Matrix World + { + get { return _world; } + set { SetWorld(ref value); } + } + + /// <summary> + /// Gets or sets the world-to-view <see cref="Matrix" />. + /// </summary> + /// <value> + /// The world-to-view <see cref="Matrix" />. + /// </value> + public Matrix View + { + get { return _view; } + set { SetView(ref value); } + } + + /// <summary> + /// Gets or sets the view-to-projection <see cref="Matrix" />. + /// </summary> + /// <value> + /// The view-to-projection <see cref="Matrix" />. + /// </value> + public Matrix Projection + { + get { return _projection; } + set { SetProjection(ref value); } + } + + /// <summary> + /// Initializes a new instance of the <see cref="MatrixChainEffect" /> class. + /// </summary> + /// <param name="graphicsDevice">The graphics device.</param> + /// <param name="byteCode">The effect code.</param> + protected MatrixChainEffect(GraphicsDevice graphicsDevice, byte[] byteCode) + : base(graphicsDevice, byteCode) + { + Initialize(); + } + + /// <summary> + /// Initializes a new instance of the <see cref="MatrixChainEffect" /> class. + /// </summary> + /// <param name="cloneSource">The clone source.</param> + protected MatrixChainEffect(Effect cloneSource) + : base(cloneSource) + { + Initialize(); + } + + private void Initialize() + { + Flags[UseDefaultProjectionBitMask] = true; + + _matrixParameter = Parameters["WorldViewProjection"]; + } + + /// <summary> + /// Sets the model-to-world <see cref="Matrix" />. + /// </summary> + /// <param name="world">The model-to-world <see cref="Matrix" />.</param> + public void SetWorld(ref Matrix world) + { + _world = world; + Flags[DirtyWorldViewProjectionBitMask] = true; + } + + /// <summary> + /// Sets the world-to-view <see cref="Matrix" />. + /// </summary> + /// <param name="view">The world-to-view <see cref="Matrix" />.</param> + public void SetView(ref Matrix view) + { + _view = view; + Flags[DirtyWorldViewProjectionBitMask] = true; + } + + /// <summary> + /// Sets the view-to-projection <see cref="Matrix" />. + /// </summary> + /// <param name="projection">The view-to-projection <see cref="Matrix" />.</param> + public void SetProjection(ref Matrix projection) + { + _projection = projection; + Flags[DirtyWorldViewProjectionBitMask] = true; + Flags[UseDefaultProjectionBitMask] = false; + } + + /// <summary> + /// Computes derived parameter values immediately before applying the effect. + /// </summary> + protected override void OnApply() + { + base.OnApply(); + + // ReSharper disable once InvertIf + if (Flags[DirtyWorldViewProjectionBitMask] || Flags[UseDefaultProjectionBitMask]) + { + if (Flags[UseDefaultProjectionBitMask]) + { + var viewport = GraphicsDevice.Viewport; + _projection = Matrix.CreateOrthographicOffCenter(0, viewport.Width, viewport.Height, 0, 0, -1); + } + + Matrix worldViewProjection; + Matrix.Multiply(ref _world, ref _view, out worldViewProjection); + Matrix.Multiply(ref worldViewProjection, ref _projection, out worldViewProjection); + _matrixParameter.SetValue(worldViewProjection); + + Flags[DirtyWorldViewProjectionBitMask] = false; + } + } + } +}
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