330 lines
10 KiB
C#
330 lines
10 KiB
C#
#region License
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//
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// The Open Toolkit Library License
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//
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// Copyright (c) 2006 - 2009 the Open Toolkit library.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do
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// so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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// OTHER DEALINGS IN THE SOFTWARE.
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//
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#endregion
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using System;
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using System.Collections.Specialized;
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using System.Text;
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namespace OpenTK.Input
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{
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/// <summary>
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/// Encapsulates the state of a Keyboard device.
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/// </summary>
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public struct KeyboardState : IEquatable<KeyboardState>
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{
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#region Fields
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// Allocate enough ints to store all keyboard keys
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const int IntSize = sizeof(int);
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const int NumInts = ((int)Key.LastKey + IntSize - 1) / IntSize;
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// The following line triggers bogus CS0214 in gmcs 2.0.1, sigh...
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unsafe fixed int Keys[NumInts];
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const int CodesSize = 256;
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unsafe fixed int Codes[CodesSize];
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bool is_connected;
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#endregion
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#region Public Members
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the specified
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/// <see cref="OpenTK.Input.Key"/> is pressed.
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/// </summary>
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/// <param name="key">The <see cref="OpenTK.Input.Key"/> to check.</param>
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/// <returns>True if key is pressed; false otherwise.</returns>
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public bool this[Key key]
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{
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get { return IsKeyDown(key); }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether the specified
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/// <see cref="OpenTK.Input.Key"/> is pressed.
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/// </summary>
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/// <param name="code">The scancode to check.</param>
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/// <returns>True if code is pressed; false otherwise.</returns>
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public bool this[short code]
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{
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get { return IsKeyDown(code); }
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this key is down.
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/// </summary>
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/// <param name="key">The <see cref="OpenTK.Input.Key"/> to check.</param>
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public bool IsKeyDown(Key key)
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{
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return ReadBit((int)key);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this scan code is down.
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/// </summary>
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/// <param name="code">The scan code to check.</param>
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public bool IsKeyDown(short code)
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{
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return ReadBit(code,true);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this key is up.
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/// </summary>
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/// <param name="key">The <see cref="OpenTK.Input.Key"/> to check.</param>
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public bool IsKeyUp(Key key)
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{
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return !ReadBit((int)key);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this scan code is down.
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/// </summary>
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/// <param name="code">The scan code to check.</param>
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public bool IsKeyUp(short code)
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{
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return !ReadBit(code,true);
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}
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/// <summary>
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/// Gets a <see cref="System.Boolean"/> indicating whether this keyboard
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/// is connected.
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/// </summary>
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public bool IsConnected
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{
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get { return is_connected; }
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internal set { is_connected = value; }
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}
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#if false
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// Disabled until the correct cross-platform API can be determined.
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public bool IsLedOn(KeyboardLeds led)
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{
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return false;
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}
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public bool IsLedOff(KeyboardLeds led)
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{
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return false;
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}
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#endif
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/// <summary>
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/// Checks whether two <see cref="KeyboardState" /> instances are equal.
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/// </summary>
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/// <param name="left">
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/// A <see cref="KeyboardState"/> instance.
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/// </param>
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/// <param name="right">
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/// A <see cref="KeyboardState"/> instance.
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/// </param>
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/// <returns>
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/// True if both left is equal to right; false otherwise.
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/// </returns>
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public static bool operator ==(KeyboardState left, KeyboardState right)
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{
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return left.Equals(right);
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}
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/// <summary>
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/// Checks whether two <see cref="KeyboardState" /> instances are not equal.
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/// </summary>
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/// <param name="left">
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/// A <see cref="KeyboardState"/> instance.
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/// </param>
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/// <param name="right">
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/// A <see cref="KeyboardState"/> instance.
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/// </param>
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/// <returns>
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/// True if both left is not equal to right; false otherwise.
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/// </returns>
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public static bool operator !=(KeyboardState left, KeyboardState right)
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{
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return !left.Equals(right);
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}
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/// <summary>
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/// Compares to an object instance for equality.
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/// </summary>
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/// <param name="obj">
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/// The <see cref="System.Object"/> to compare to.
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/// </param>
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/// <returns>
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/// True if this instance is equal to obj; false otherwise.
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/// </returns>
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public override bool Equals(object obj)
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{
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if (obj is KeyboardState)
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{
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return this == (KeyboardState)obj;
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}
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else
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{
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return false;
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}
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}
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/// <summary>
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/// Generates a hashcode for the current instance.
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/// </summary>
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/// <returns>
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/// A <see cref="System.Int32"/> represting the hashcode for this instance.
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/// </returns>
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public override int GetHashCode()
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{
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unsafe
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{
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fixed (int* k = Keys)
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{
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int hashcode = 0;
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for (int i = 0; i < NumInts; i++)
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hashcode ^= (k + i)->GetHashCode();
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return hashcode;
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}
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}
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}
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#endregion
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#region Internal Members
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internal void SetKeyState(Key key, byte code, bool down)
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{
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if (down)
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{
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EnableBit((int)key);
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EnableBit(code,true);
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}
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else
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{
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DisableBit((int)key);
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DisableBit(code, true);
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}
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}
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internal bool ReadBit(int offset, bool ScanCode = false)
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{
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ValidateOffset(offset, ScanCode);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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if (ScanCode)
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fixed (int* c = Codes) { return (*(c + int_offset) & (1 << bit_offset)) != 0u; }
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else
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fixed (int* k = Keys) { return (*(k + int_offset) & (1 << bit_offset)) != 0u; }
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}
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}
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internal void EnableBit(int offset, bool ScanCode = false)
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{
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ValidateOffset(offset, ScanCode);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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if (ScanCode)
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fixed (int* c = Codes) { *(c + int_offset) |= 1 << bit_offset; }
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else
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fixed (int* k = Keys) { *(k + int_offset) |= 1 << bit_offset; }
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}
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}
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internal void DisableBit(int offset, bool ScanCode = false)
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{
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ValidateOffset(offset, ScanCode);
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int int_offset = offset / 32;
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int bit_offset = offset % 32;
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unsafe
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{
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if (ScanCode)
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fixed (int* c = Codes) { *(c + int_offset) &= ~(1 << bit_offset); }
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else
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fixed (int* k = Keys) { *(k + int_offset) &= ~(1 << bit_offset); }
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}
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}
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internal void MergeBits(KeyboardState other)
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{
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unsafe
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{
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int* k2 = other.Keys;
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fixed (int* k1 = Keys)
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{
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for (int i = 0; i < NumInts; i++)
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*(k1 + i) |= *(k2 + i);
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}
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int* c2 = other.Codes;
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fixed (int* c1 = Codes)
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{
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for (int i = 0; i < CodesSize; i++)
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*(c1 + i) |= *(c2 + i);
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}
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}
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IsConnected |= other.IsConnected;
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}
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#endregion
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#region Private Members
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static void ValidateOffset(int offset, bool ScanCode)
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{
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if (offset < 0 || offset >= (ScanCode ? 256 : NumInts * IntSize))
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throw new ArgumentOutOfRangeException("offset");
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}
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#endregion
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#region IEquatable<KeyboardState> Members
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/// <summary>
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/// Compares two KeyboardState instances.
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/// </summary>
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/// <param name="other">The instance to compare two.</param>
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/// <returns>True, if both instances are equal; false otherwise.</returns>
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public bool Equals(KeyboardState other)
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{
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bool equal = true;
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unsafe
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{
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int* k2 = other.Keys;
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fixed (int* k1 = Keys)
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{
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for (int i = 0; equal && i < NumInts; i++)
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equal &= *(k1 + i) == *(k2 + i);
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}
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}
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return equal;
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}
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#endregion
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}
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}
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