Joonas Rikkonen
115 lines
3.9 KiB
C#
115 lines
3.9 KiB
C#
// MonoGame - Copyright (C) The MonoGame Team
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// This file is subject to the terms and conditions defined in
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// file 'LICENSE.txt', which is part of this source code package.
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using System;
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namespace Microsoft.Xna.Framework.Graphics
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{
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public partial class OcclusionQuery : GraphicsResource
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{
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private bool _inBeginEndPair; // true if Begin was called and End was not yet called.
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private bool _queryPerformed; // true if Begin+End were called at least once.
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private bool _isComplete; // true if the result is available in _pixelCount.
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private int _pixelCount; // The query result.
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/// <summary>
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/// Gets a value indicating whether the occlusion query has completed.
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/// </summary>
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/// <value>
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/// <see langword="true"/> if the occlusion query has completed; otherwise,
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/// <see langword="false"/>.
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/// </value>
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public bool IsComplete
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{
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get
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{
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if (_isComplete)
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return true;
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if (!_queryPerformed || _inBeginEndPair)
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return false;
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_isComplete = PlatformGetResult(out _pixelCount);
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return _isComplete;
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}
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}
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/// <summary>
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/// Gets the number of visible pixels.
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/// </summary>
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/// <value>The number of visible pixels.</value>
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/// <exception cref="InvalidOperationException">
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/// The occlusion query has not yet completed. Check <see cref="IsComplete"/> before reading
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/// the result!
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/// </exception>
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public int PixelCount
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{
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get
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{
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if (!IsComplete)
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throw new InvalidOperationException("The occlusion query has not yet completed. Check IsComplete before reading the result.");
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return _pixelCount;
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}
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="OcclusionQuery"/> class.
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/// </summary>
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/// <param name="graphicsDevice">The graphics device.</param>
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/// <exception cref="ArgumentNullException">
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/// <paramref name="graphicsDevice"/> is <see langword="null"/>.
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/// </exception>
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/// <exception cref="NotSupportedException">
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/// The current graphics profile does not support occlusion queries.
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/// </exception>
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public OcclusionQuery(GraphicsDevice graphicsDevice)
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{
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if (graphicsDevice == null)
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throw new ArgumentNullException("graphicsDevice");
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if (graphicsDevice.GraphicsProfile == GraphicsProfile.Reach)
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throw new NotSupportedException("The Reach profile does not support occlusion queries.");
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GraphicsDevice = graphicsDevice;
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PlatformConstruct();
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}
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/// <summary>
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/// Begins the occlusion query.
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/// </summary>
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/// <exception cref="InvalidOperationException">
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/// <see cref="Begin"/> is called again before calling <see cref="End"/>.
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/// </exception>
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public void Begin()
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{
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if (_inBeginEndPair)
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throw new InvalidOperationException("End() must be called before calling Begin() again.");
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_inBeginEndPair = true;
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_isComplete = false;
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PlatformBegin();
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}
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/// <summary>
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/// Ends the occlusion query.
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/// </summary>
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/// <exception cref="InvalidOperationException">
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/// <see cref="End"/> is called before calling <see cref="Begin"/>.
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/// </exception>
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public void End()
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{
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if (!_inBeginEndPair)
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throw new InvalidOperationException("Begin() must be called before calling End().");
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_inBeginEndPair = false;
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_queryPerformed = true;
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PlatformEnd();
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}
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}
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}
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