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#region File Description
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//-----------------------------------------------------------------------------
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// SpriteEffect.cs
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//
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// Microsoft XNA Community Game Platform
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// Copyright (C) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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#endregion
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namespace Microsoft.Xna.Framework.Graphics
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{
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/// <summary>
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/// The default effect used by SpriteBatch.
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/// </summary>
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internal class SpriteEffect : Effect
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{
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#region Effect Parameters
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EffectParameter matrixParam;
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#endregion
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#region Methods
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/// <summary>
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/// Creates a new SpriteEffect.
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/// </summary>
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public SpriteEffect(GraphicsDevice device)
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: base(device, Resources.SpriteEffect)
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{
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CacheEffectParameters();
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}
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/// <summary>
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/// Creates a new SpriteEffect by cloning parameter settings from an existing instance.
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/// </summary>
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protected SpriteEffect(SpriteEffect cloneSource)
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: base(cloneSource)
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{
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CacheEffectParameters();
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}
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/// <summary>
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/// Creates a clone of the current SpriteEffect instance.
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/// </summary>
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public override Effect Clone()
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{
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return new SpriteEffect(this);
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}
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/// <summary>
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/// Looks up shortcut references to our effect parameters.
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/// </summary>
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void CacheEffectParameters()
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{
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matrixParam = Parameters["MatrixTransform"];
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}
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/// <summary>
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/// Lazily computes derived parameter values immediately before applying the effect.
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/// </summary>
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protected internal override void OnApply()
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{
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Viewport viewport = GraphicsDevice.Viewport;
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Matrix projection = Matrix.CreateOrthographicOffCenter(0, viewport.Width, viewport.Height, 0, 0, 1);
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Matrix halfPixelOffset = Matrix.CreateTranslation(-0.5f, -0.5f, 0);
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matrixParam.SetValue(halfPixelOffset * projection);
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}
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#endregion
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}
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}
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