296 lines
13 KiB
C#
296 lines
13 KiB
C#
using System.Runtime.InteropServices;
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using System.Text;
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using SDL2;
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namespace Nerfed.Runtime;
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public static class Keyboard
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{
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private static readonly List<char> textInput = new List<char>();
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private const int maxPressedKeys = 8;
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private static readonly List<Key> keys = new List<Key>(maxPressedKeys);
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private static readonly List<Key> lastKeys = new List<Key>(maxPressedKeys);
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/// <summary>
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/// True if the key was pressed or continued to be held down this frame.
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/// </summary>
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/// <param name="key"></param>
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/// <returns></returns>
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public static bool IsKeyDown(Key key)
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{
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return HasKey(keys, key);
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}
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/// <summary>
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/// True if the key was pressed this frame.
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/// </summary>
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public static bool IsKeyPressed(Key key)
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{
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return HasKey(keys, key) && !HasKey(lastKeys, key);
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}
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/// <summary>
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/// True if the key was released or continued to be released this frame.
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/// </summary>
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public static bool IsKeyUp(Key key)
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{
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return !HasKey(keys, key);
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}
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/// <summary>
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/// True if the key was released this frame.
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/// </summary>
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public static bool IsKeyReleased(Key key)
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{
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return !HasKey(keys, key) && HasKey(lastKeys, key);
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}
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public static ReadOnlySpan<Key> GetPressedKeys()
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{
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return CollectionsMarshal.AsSpan(keys);
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}
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public static ReadOnlySpan<char> GetTextInput()
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{
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return CollectionsMarshal.AsSpan(textInput);
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}
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internal static void Update()
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{
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textInput.Clear();
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lastKeys.Clear();
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if (keys.Count > 0)
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{
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lastKeys.AddRange(keys);
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}
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}
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private static bool HasKey(List<Key> list, Key key)
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{
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for (int i = 0; i < list.Count; i++)
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{
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if (keys[i] == key)
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{
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return true;
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}
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}
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return false;
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}
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internal static void ProcessEvent(ref SDL.SDL_Event ev)
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{
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switch (ev.type)
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{
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case SDL.SDL_EventType.SDL_TEXTINPUT:
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ProcessTextInputEvent(ref ev.text);
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break;
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case SDL.SDL_EventType.SDL_KEYDOWN:
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ProcessKeyDownEvent(ref ev.key);
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break;
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case SDL.SDL_EventType.SDL_KEYUP:
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ProcessKeyUpEvent(ref ev.key);
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break;
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}
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}
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private static unsafe void ProcessTextInputEvent(ref SDL.SDL_TextInputEvent evt)
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{
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// Based on the SDL2# LPUtf8StrMarshaler
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int MeasureStringLength(byte* ptr)
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{
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int bytes;
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for (bytes = 0; *ptr != 0; ptr += 1, bytes += 1) ;
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return bytes;
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}
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fixed (byte* textPtr = evt.text)
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{
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int bytes = MeasureStringLength(textPtr);
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if (bytes > 0)
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{
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/* UTF8 will never encode more characters
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* than bytes in a string, so bytes is a
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* suitable upper estimate of size needed
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*/
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char* charsBuffer = stackalloc char[bytes];
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int chars = Encoding.UTF8.GetChars(
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textPtr,
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bytes,
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charsBuffer,
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bytes
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);
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if (chars > 0)
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{
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textInput.AddRange(new ReadOnlySpan<char>(charsBuffer, chars));
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}
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}
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}
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}
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private static void ProcessKeyDownEvent(ref SDL.SDL_KeyboardEvent ev)
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{
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Key key = ConvertScancode(ev.keysym.scancode);
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SetKeyState(key, KeyState.Down);
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}
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private static void ProcessKeyUpEvent(ref SDL.SDL_KeyboardEvent ev)
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{
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Key key = ConvertScancode(ev.keysym.scancode);
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SetKeyState(key, KeyState.Up);
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}
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public static void SetKeyState(Key key, KeyState state)
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{
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if (keys.Count >= maxPressedKeys)
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{
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return;
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}
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if (state == KeyState.Down)
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{
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if (!keys.Contains(key))
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{
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keys.Add(key);
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}
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}
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else if (state == KeyState.Up)
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{
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keys.Remove(key);
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}
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}
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private static Key ConvertScancode(SDL.SDL_Scancode scancode)
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{
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switch (scancode)
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{
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case SDL.SDL_Scancode.SDL_SCANCODE_A: return Key.A;
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case SDL.SDL_Scancode.SDL_SCANCODE_B: return Key.B;
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case SDL.SDL_Scancode.SDL_SCANCODE_C: return Key.C;
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case SDL.SDL_Scancode.SDL_SCANCODE_D: return Key.D;
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case SDL.SDL_Scancode.SDL_SCANCODE_E: return Key.E;
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case SDL.SDL_Scancode.SDL_SCANCODE_F: return Key.F;
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case SDL.SDL_Scancode.SDL_SCANCODE_G: return Key.G;
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case SDL.SDL_Scancode.SDL_SCANCODE_H: return Key.H;
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case SDL.SDL_Scancode.SDL_SCANCODE_I: return Key.I;
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case SDL.SDL_Scancode.SDL_SCANCODE_J: return Key.J;
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case SDL.SDL_Scancode.SDL_SCANCODE_K: return Key.K;
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case SDL.SDL_Scancode.SDL_SCANCODE_L: return Key.L;
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case SDL.SDL_Scancode.SDL_SCANCODE_M: return Key.M;
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case SDL.SDL_Scancode.SDL_SCANCODE_N: return Key.N;
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case SDL.SDL_Scancode.SDL_SCANCODE_O: return Key.O;
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case SDL.SDL_Scancode.SDL_SCANCODE_P: return Key.P;
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case SDL.SDL_Scancode.SDL_SCANCODE_Q: return Key.Q;
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case SDL.SDL_Scancode.SDL_SCANCODE_R: return Key.R;
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case SDL.SDL_Scancode.SDL_SCANCODE_S: return Key.S;
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case SDL.SDL_Scancode.SDL_SCANCODE_T: return Key.T;
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case SDL.SDL_Scancode.SDL_SCANCODE_U: return Key.U;
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case SDL.SDL_Scancode.SDL_SCANCODE_V: return Key.V;
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case SDL.SDL_Scancode.SDL_SCANCODE_W: return Key.W;
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case SDL.SDL_Scancode.SDL_SCANCODE_X: return Key.X;
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case SDL.SDL_Scancode.SDL_SCANCODE_Y: return Key.Y;
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case SDL.SDL_Scancode.SDL_SCANCODE_Z: return Key.Z;
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case SDL.SDL_Scancode.SDL_SCANCODE_1: return Key.D1;
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case SDL.SDL_Scancode.SDL_SCANCODE_2: return Key.D2;
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case SDL.SDL_Scancode.SDL_SCANCODE_3: return Key.D3;
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case SDL.SDL_Scancode.SDL_SCANCODE_4: return Key.D4;
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case SDL.SDL_Scancode.SDL_SCANCODE_5: return Key.D5;
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case SDL.SDL_Scancode.SDL_SCANCODE_6: return Key.D6;
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case SDL.SDL_Scancode.SDL_SCANCODE_7: return Key.D7;
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case SDL.SDL_Scancode.SDL_SCANCODE_8: return Key.D8;
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case SDL.SDL_Scancode.SDL_SCANCODE_9: return Key.D9;
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case SDL.SDL_Scancode.SDL_SCANCODE_0: return Key.D0;
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case SDL.SDL_Scancode.SDL_SCANCODE_RETURN: return Key.Enter;
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case SDL.SDL_Scancode.SDL_SCANCODE_ESCAPE: return Key.Escape;
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case SDL.SDL_Scancode.SDL_SCANCODE_BACKSPACE: return Key.Backspace;
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case SDL.SDL_Scancode.SDL_SCANCODE_TAB: return Key.Tab;
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case SDL.SDL_Scancode.SDL_SCANCODE_SPACE: return Key.Space;
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case SDL.SDL_Scancode.SDL_SCANCODE_MINUS: return Key.Minus;
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case SDL.SDL_Scancode.SDL_SCANCODE_EQUALS: return Key.Equals;
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case SDL.SDL_Scancode.SDL_SCANCODE_LEFTBRACKET: return Key.LeftBracket;
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case SDL.SDL_Scancode.SDL_SCANCODE_RIGHTBRACKET: return Key.RightBracket;
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case SDL.SDL_Scancode.SDL_SCANCODE_BACKSLASH: return Key.Backslash;
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case SDL.SDL_Scancode.SDL_SCANCODE_SEMICOLON: return Key.Semicolon;
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case SDL.SDL_Scancode.SDL_SCANCODE_APOSTROPHE: return Key.Apostrophe;
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case SDL.SDL_Scancode.SDL_SCANCODE_GRAVE: return Key.Tilde;
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case SDL.SDL_Scancode.SDL_SCANCODE_COMMA: return Key.Comma;
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case SDL.SDL_Scancode.SDL_SCANCODE_PERIOD: return Key.Period;
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case SDL.SDL_Scancode.SDL_SCANCODE_SLASH: return Key.Slash;
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case SDL.SDL_Scancode.SDL_SCANCODE_CAPSLOCK: return Key.CapsLock;
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case SDL.SDL_Scancode.SDL_SCANCODE_F1: return Key.F1;
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case SDL.SDL_Scancode.SDL_SCANCODE_F2: return Key.F2;
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case SDL.SDL_Scancode.SDL_SCANCODE_F3: return Key.F3;
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case SDL.SDL_Scancode.SDL_SCANCODE_F4: return Key.F4;
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case SDL.SDL_Scancode.SDL_SCANCODE_F5: return Key.F5;
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case SDL.SDL_Scancode.SDL_SCANCODE_F6: return Key.F6;
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case SDL.SDL_Scancode.SDL_SCANCODE_F7: return Key.F7;
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case SDL.SDL_Scancode.SDL_SCANCODE_F8: return Key.F8;
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case SDL.SDL_Scancode.SDL_SCANCODE_F9: return Key.F9;
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case SDL.SDL_Scancode.SDL_SCANCODE_F10: return Key.F10;
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case SDL.SDL_Scancode.SDL_SCANCODE_F11: return Key.F11;
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case SDL.SDL_Scancode.SDL_SCANCODE_F12: return Key.F12;
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case SDL.SDL_Scancode.SDL_SCANCODE_PRINTSCREEN: return Key.PrintScreen;
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case SDL.SDL_Scancode.SDL_SCANCODE_SCROLLLOCK: return Key.Scroll;
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case SDL.SDL_Scancode.SDL_SCANCODE_PAUSE: return Key.Pause;
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case SDL.SDL_Scancode.SDL_SCANCODE_INSERT: return Key.Insert;
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case SDL.SDL_Scancode.SDL_SCANCODE_HOME: return Key.Home;
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case SDL.SDL_Scancode.SDL_SCANCODE_PAGEUP: return Key.PageUp;
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case SDL.SDL_Scancode.SDL_SCANCODE_DELETE: return Key.Delete;
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case SDL.SDL_Scancode.SDL_SCANCODE_END: return Key.End;
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case SDL.SDL_Scancode.SDL_SCANCODE_PAGEDOWN: return Key.PageDown;
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case SDL.SDL_Scancode.SDL_SCANCODE_RIGHT: return Key.Right;
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case SDL.SDL_Scancode.SDL_SCANCODE_LEFT: return Key.Left;
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case SDL.SDL_Scancode.SDL_SCANCODE_DOWN: return Key.Down;
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case SDL.SDL_Scancode.SDL_SCANCODE_UP: return Key.Up;
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case SDL.SDL_Scancode.SDL_SCANCODE_NUMLOCKCLEAR: return Key.NumLock;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_DIVIDE: return Key.Divide;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_MULTIPLY: return Key.Multiply;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_MINUS: return Key.Subtract;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_PLUS: return Key.Add;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_ENTER: return Key.Enter;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_1: return Key.NumPad1;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_2: return Key.NumPad2;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_3: return Key.NumPad3;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_4: return Key.NumPad4;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_5: return Key.NumPad5;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_6: return Key.NumPad6;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_7: return Key.NumPad7;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_8: return Key.NumPad8;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_9: return Key.NumPad9;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_0: return Key.NumPad0;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_PERIOD: return Key.Period;
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case SDL.SDL_Scancode.SDL_SCANCODE_APPLICATION: return Key.Apps;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_EQUALS: return Key.Equals;
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case SDL.SDL_Scancode.SDL_SCANCODE_F13: return Key.F13;
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case SDL.SDL_Scancode.SDL_SCANCODE_F14: return Key.F14;
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case SDL.SDL_Scancode.SDL_SCANCODE_F15: return Key.F15;
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case SDL.SDL_Scancode.SDL_SCANCODE_F16: return Key.F16;
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case SDL.SDL_Scancode.SDL_SCANCODE_F17: return Key.F17;
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case SDL.SDL_Scancode.SDL_SCANCODE_F18: return Key.F18;
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case SDL.SDL_Scancode.SDL_SCANCODE_F19: return Key.F19;
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case SDL.SDL_Scancode.SDL_SCANCODE_F20: return Key.F20;
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case SDL.SDL_Scancode.SDL_SCANCODE_F21: return Key.F21;
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case SDL.SDL_Scancode.SDL_SCANCODE_F22: return Key.F22;
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case SDL.SDL_Scancode.SDL_SCANCODE_F23: return Key.F23;
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case SDL.SDL_Scancode.SDL_SCANCODE_F24: return Key.F24;
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case SDL.SDL_Scancode.SDL_SCANCODE_EXECUTE: return Key.Execute;
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case SDL.SDL_Scancode.SDL_SCANCODE_HELP: return Key.Help;
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case SDL.SDL_Scancode.SDL_SCANCODE_MENU: return Key.Apps;
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case SDL.SDL_Scancode.SDL_SCANCODE_SELECT: return Key.Select;
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case SDL.SDL_Scancode.SDL_SCANCODE_KP_COMMA: return Key.Comma;
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case SDL.SDL_Scancode.SDL_SCANCODE_LCTRL: return Key.LeftControl;
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case SDL.SDL_Scancode.SDL_SCANCODE_LSHIFT: return Key.LeftShift;
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case SDL.SDL_Scancode.SDL_SCANCODE_LALT: return Key.LeftAlt;
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case SDL.SDL_Scancode.SDL_SCANCODE_LGUI: return Key.LeftSuper;
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case SDL.SDL_Scancode.SDL_SCANCODE_RCTRL: return Key.RightControl;
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case SDL.SDL_Scancode.SDL_SCANCODE_RSHIFT: return Key.RightShift;
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case SDL.SDL_Scancode.SDL_SCANCODE_RALT: return Key.RightAlt;
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case SDL.SDL_Scancode.SDL_SCANCODE_RGUI: return Key.RightSuper;
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default: return Key.None;
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}
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}
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}
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