273 lines
7.4 KiB
Go
273 lines
7.4 KiB
Go
package keyboard
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import (
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"github.com/hajimehoshi/ebiten"
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)
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var ebitenASCIIMap map[ebiten.Key]uint8 // ebiten keys mapped to ASCII
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var shiftMap map[uint8]uint8 // ebiten keys mapped to ASCII when shift is pressed
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var controlMap map[uint8]uint8 // ebiten keys mapped to ASCII when control is pressed
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var keyBoardData uint8 // Contents of the $c000 address
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var strobe uint8 // Contents of the $c010 address
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var previousKeysPressed map[uint8]bool // Keep track of what keys have been pressed in the previous round
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var capsLock bool // Is capslock down
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// Init the keyboard state and ebiten translation tables
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func Init() {
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keyBoardData = 0
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strobe = 0
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capsLock = true
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ebitenASCIIMap = make(map[ebiten.Key]uint8)
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shiftMap = make(map[uint8]uint8)
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controlMap = make(map[uint8]uint8)
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previousKeysPressed = make(map[uint8]bool)
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ebitenASCIIMap[ebiten.KeyLeft] = 8
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ebitenASCIIMap[ebiten.KeyTab] = 9
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ebitenASCIIMap[ebiten.KeyDown] = 10
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ebitenASCIIMap[ebiten.KeyUp] = 11
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ebitenASCIIMap[ebiten.KeyEnter] = 13
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ebitenASCIIMap[ebiten.KeyRight] = 21
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ebitenASCIIMap[ebiten.KeyEscape] = 27
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ebitenASCIIMap[ebiten.KeyDelete] = 127
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ebitenASCIIMap[ebiten.Key0] = '0'
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ebitenASCIIMap[ebiten.Key1] = '1'
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ebitenASCIIMap[ebiten.Key2] = '2'
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ebitenASCIIMap[ebiten.Key3] = '3'
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ebitenASCIIMap[ebiten.Key4] = '4'
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ebitenASCIIMap[ebiten.Key5] = '5'
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ebitenASCIIMap[ebiten.Key6] = '6'
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ebitenASCIIMap[ebiten.Key7] = '7'
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ebitenASCIIMap[ebiten.Key8] = '8'
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ebitenASCIIMap[ebiten.Key9] = '9'
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ebitenASCIIMap[ebiten.KeyA] = 'a'
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ebitenASCIIMap[ebiten.KeyB] = 'b'
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ebitenASCIIMap[ebiten.KeyC] = 'c'
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ebitenASCIIMap[ebiten.KeyD] = 'd'
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ebitenASCIIMap[ebiten.KeyE] = 'e'
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ebitenASCIIMap[ebiten.KeyF] = 'f'
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ebitenASCIIMap[ebiten.KeyG] = 'g'
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ebitenASCIIMap[ebiten.KeyH] = 'h'
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ebitenASCIIMap[ebiten.KeyI] = 'i'
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ebitenASCIIMap[ebiten.KeyJ] = 'j'
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ebitenASCIIMap[ebiten.KeyK] = 'k'
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ebitenASCIIMap[ebiten.KeyL] = 'l'
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ebitenASCIIMap[ebiten.KeyM] = 'm'
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ebitenASCIIMap[ebiten.KeyN] = 'n'
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ebitenASCIIMap[ebiten.KeyO] = 'o'
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ebitenASCIIMap[ebiten.KeyP] = 'p'
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ebitenASCIIMap[ebiten.KeyQ] = 'q'
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ebitenASCIIMap[ebiten.KeyR] = 'r'
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ebitenASCIIMap[ebiten.KeyS] = 's'
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ebitenASCIIMap[ebiten.KeyT] = 't'
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ebitenASCIIMap[ebiten.KeyU] = 'u'
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ebitenASCIIMap[ebiten.KeyV] = 'v'
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ebitenASCIIMap[ebiten.KeyW] = 'w'
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ebitenASCIIMap[ebiten.KeyX] = 'x'
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ebitenASCIIMap[ebiten.KeyY] = 'y'
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ebitenASCIIMap[ebiten.KeyZ] = 'z'
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ebitenASCIIMap[ebiten.KeyApostrophe] = '\''
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ebitenASCIIMap[ebiten.KeyBackslash] = '\\'
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ebitenASCIIMap[ebiten.KeyComma] = ','
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ebitenASCIIMap[ebiten.KeyEqual] = '='
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ebitenASCIIMap[ebiten.KeyGraveAccent] = '`'
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ebitenASCIIMap[ebiten.KeyLeftBracket] = '['
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ebitenASCIIMap[ebiten.KeyMinus] = '-'
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ebitenASCIIMap[ebiten.KeyPeriod] = '.'
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ebitenASCIIMap[ebiten.KeyRightBracket] = ']'
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ebitenASCIIMap[ebiten.KeySemicolon] = ';'
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ebitenASCIIMap[ebiten.KeySlash] = '/'
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ebitenASCIIMap[ebiten.KeySpace] = ' '
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shiftMap['1'] = '!'
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shiftMap['2'] = '@'
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shiftMap['3'] = '#'
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shiftMap['4'] = '$'
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shiftMap['5'] = '%'
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shiftMap['6'] = '^'
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shiftMap['7'] = '&'
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shiftMap['8'] = '*'
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shiftMap['9'] = '('
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shiftMap['0'] = ')'
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shiftMap['-'] = '_'
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shiftMap['='] = '+'
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shiftMap['a'] = 'A'
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shiftMap['b'] = 'B'
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shiftMap['c'] = 'C'
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shiftMap['d'] = 'D'
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shiftMap['e'] = 'E'
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shiftMap['f'] = 'F'
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shiftMap['g'] = 'G'
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shiftMap['h'] = 'H'
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shiftMap['i'] = 'I'
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shiftMap['j'] = 'J'
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shiftMap['k'] = 'K'
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shiftMap['l'] = 'L'
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shiftMap['m'] = 'M'
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shiftMap['n'] = 'N'
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shiftMap['o'] = 'O'
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shiftMap['p'] = 'P'
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shiftMap['q'] = 'Q'
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shiftMap['r'] = 'R'
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shiftMap['s'] = 'S'
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shiftMap['t'] = 'T'
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shiftMap['u'] = 'U'
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shiftMap['v'] = 'V'
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shiftMap['w'] = 'W'
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shiftMap['x'] = 'X'
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shiftMap['y'] = 'Y'
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shiftMap['z'] = 'Z'
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shiftMap[','] = '<'
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shiftMap['.'] = '>'
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shiftMap['/'] = '?'
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shiftMap['`'] = '~'
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shiftMap['['] = '{'
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shiftMap[']'] = '}'
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shiftMap[';'] = ':'
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shiftMap['\''] = '"'
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shiftMap['\\'] = '|'
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shiftMap[' '] = ' '
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controlMap['A'] = 'A' - 0x40
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controlMap['B'] = 'B' - 0x40
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controlMap['C'] = 'C' - 0x40
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controlMap['D'] = 'D' - 0x40
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controlMap['E'] = 'E' - 0x40
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controlMap['F'] = 'F' - 0x40
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controlMap['G'] = 'G' - 0x40
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controlMap['H'] = 'H' - 0x40
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controlMap['I'] = 'I' - 0x40
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controlMap['J'] = 'J' - 0x40
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controlMap['K'] = 'K' - 0x40
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controlMap['L'] = 'L' - 0x40
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controlMap['M'] = 'M' - 0x40
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controlMap['N'] = 'N' - 0x40
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controlMap['O'] = 'O' - 0x40
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controlMap['P'] = 'P' - 0x40
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controlMap['Q'] = 'Q' - 0x40
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controlMap['R'] = 'R' - 0x40
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controlMap['S'] = 'S' - 0x40
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controlMap['T'] = 'T' - 0x40
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controlMap['U'] = 'U' - 0x40
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controlMap['V'] = 'V' - 0x40
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controlMap['W'] = 'W' - 0x40
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controlMap['X'] = 'X' - 0x40
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controlMap['Y'] = 'Y' - 0x40
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controlMap['Z'] = 'Z' - 0x40
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controlMap[']'] = 0x5d
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controlMap['`'] = 0x60
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controlMap['a'] = 'a' - 0x60
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controlMap['b'] = 'b' - 0x60
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controlMap['c'] = 'c' - 0x60
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controlMap['d'] = 'd' - 0x60
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controlMap['e'] = 'e' - 0x60
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controlMap['f'] = 'f' - 0x60
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controlMap['g'] = 'g' - 0x60
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controlMap['h'] = 'h' - 0x60
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controlMap['i'] = 'i' - 0x60
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controlMap['j'] = 'j' - 0x60
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controlMap['k'] = 'k' - 0x60
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controlMap['l'] = 'l' - 0x60
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controlMap['m'] = 'm' - 0x60
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controlMap['n'] = 'n' - 0x60
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controlMap['o'] = 'o' - 0x60
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controlMap['p'] = 'p' - 0x60
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controlMap['q'] = 'q' - 0x60
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controlMap['r'] = 'r' - 0x60
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controlMap['s'] = 's' - 0x60
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controlMap['t'] = 't' - 0x60
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controlMap['u'] = 'u' - 0x60
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controlMap['v'] = 'v' - 0x60
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controlMap['w'] = 'w' - 0x60
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controlMap['x'] = 'x' - 0x60
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controlMap['y'] = 'y' - 0x60
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controlMap['z'] = 'z' - 0x60
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controlMap['}'] = 0x5d
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controlMap['~'] = 0x60
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}
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// Poll queries ebiten's keyboard state and transforms that into ASCII
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// values in $c000 and $c010. Keypresses from the previous round have to be
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// taken into account in order to detect if a single new key has been pressed.
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func Poll() {
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allKeysPressed := make(map[uint8]bool)
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newKeysPressed := make(map[uint8]bool)
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// Query ebiten for all possible keys
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for k, v := range ebitenASCIIMap {
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if ebiten.IsKeyPressed(k) {
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allKeysPressed[v] = true
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_, present := previousKeysPressed[v]
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if !present {
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newKeysPressed[v] = true
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}
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}
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}
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previousKeysPressed = allKeysPressed
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if len(allKeysPressed) == 0 {
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// No keys are pressed, clear the strobe and return
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strobe = keyBoardData & 0x7f
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return
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} else if len(newKeysPressed) == 0 {
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// No new keys pressed, do nothing
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return
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} else if len(newKeysPressed) > 1 {
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// More than one new keys pressed, do nothing
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return
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}
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// Implicit else, one new key has been pressed
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// Get the key
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keys := []uint8{}
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for k := range newKeysPressed {
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keys = append(keys, k)
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}
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key := keys[0]
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if ebiten.IsKeyPressed(ebiten.KeyControl) && ebiten.IsKeyPressed(ebiten.KeyAlt) && key == 'c' {
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// Toggle capslock
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capsLock = !capsLock
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} else {
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// Normal case. Transform the ebiten key into ASCII
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shift := ebiten.IsKeyPressed(ebiten.KeyShift)
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shift = shift || (capsLock && key >= 'a' && key <= 'z')
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if shift {
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shiftedKey, present := shiftMap[key]
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if present {
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key = shiftedKey
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}
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}
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if ebiten.IsKeyPressed(ebiten.KeyControl) {
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controlKey, present := controlMap[key]
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if present {
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key = controlKey
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}
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}
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keyBoardData = key | 0x80
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strobe = keyBoardData
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}
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return
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}
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// Read returns the data and strobe values from set from the Poll() call
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func Read() (uint8, uint8) {
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return keyBoardData, strobe
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}
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// ResetStrobe clears the high bit in keyboardData
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func ResetStrobe() {
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keyBoardData &= 0x7f
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}
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