This functions converts a Virtual Key (VK) code to a GLFW key code.

convertVKtoGLFW.java

/**
 * The most used keys are mapped here. If not, the function
 * will return -2. -1 is reserved for "GLFW_KEY_UNKNOWN".
 * 
 * Version 1.0
 * Future updates here: https://gist.github.com/N3ROO/eb0cc2fc38920fb5081aba2c542eda55
 *
 * @param vk_code Virtual key code
 * @return the GLFW key code corresponding (-2 if not supported)
 */
public static int convertVKtoGLFW(int vk_code) {

    // 1 -> L mouse
    // 2 -> R mouse
    // 3 -> control break processing
    // 4 -> middle mouse button
    // 5 -> windows 2000 X1
    // 6 -> windows 2000 X2
    // 7 -> undefined
    if (vk_code == 8) {
        // 8 -> back space
        return 259;
    }
    if (vk_code == 9) {
        // 9 -> tab key
        return  258;
    }
    // 10, 11 -> reserved
    // 12 -> clear key
    if (vk_code == 13) {
        // 13 -> enter key
        return 257;
    }
    // 14, 15 -> undefined
    // 16 -> shift - there is no equivalent in GLFW
    // 17 -> ctrl - there is no equivalent in GLFW
    // 18 -> alt - there is no equivalent in GLFW
    if (vk_code == 19) {
        // 19 -> pause
        return 284;
    }
    if (vk_code == 20) {
        // 20 -> caps lock
        return 280;
    }
    // 21, ..., 26 -> IME stuff
    if (vk_code == 27) {
        // 27 -> esc
        return 256;
    }
    // 28, ..., 31 -> IME stuff
    if (vk_code == 32) {
        // space
        return 32;
    }
    if (vk_code == 33) {
        // 33 -> page up
        return 266;
    }
    if (vk_code == 34) {
        // 34 -> page down
        return 267;
    }
    if (vk_code == 35) {
        // 35 -> end
        return 269;
    }
    if (vk_code == 36) {
        // 36 -> home
        return 268;
    }
    if (vk_code == 37) {
        // 37 -> left arrow
        return 263;
    }
    if (vk_code == 38) {
        // 38 -> up arrow
        return 265;
    }
    if (vk_code == 39) {
        // 39 -> right arrow
        return 262;
    }
    if (vk_code == 40) {
        // 40 -> down arrow
        return 264;
    }
    // 41 -> select
    // 42 -> print
    // 43 -> execute
    // 44 -> print screen
    if (vk_code == 45) {
        // 45 -> insert
        return 260;
    }
    if (vk_code == 46) {
        // 46 -> del
        return 261;
    }
    // 47 -> help
    if (vk_code >= 48 && vk_code <= 57) {
        // 48-57 -> 0-9
        return vk_code;
    }
    // 58-64 -> undefined
    if (vk_code >= 65 && vk_code <= 90) {
        // 65-90 -> a-z
        return vk_code;
    }
    // 91-93 -> win keys
    // 94 -> reserved
    // 95 -> sleep
    if (vk_code >= 96 && vk_code <= 105) {
        // 96-105 -> 0-9 numpad
        return vk_code - 224;
    }
    if (vk_code == 106) {
        // 106 -> multiply
        return 332;
    }
    if (vk_code == 107) {
        // 107 -> add
        return 334;
    }
    // 108 -> separator
    if (vk_code == 109) {
        // 109 -> subtract
        return 333;
    }
    if (vk_code == 110) {
        // 110 -> decimal
        return 330;
    }
    if (vk_code == 111) {
        // 111 -> divide
        return 331;
    }
    if (vk_code >= 112 && vk_code <= 135) {
        // 112-135 -> F1-F25
        return vk_code + 178;
    }
    // 136-143 -> unassigned
    if (vk_code == 144) {
        // 144 -> num lock
        return 282;
    }
    if (vk_code == 145) {
        return 281;
    }
    // 146-150 -> OEM specific
    // 151-159 -> unassigned
    if (vk_code == 160) {
        // 160 -> left shift
        return 340;
    }
    if (vk_code == 161) {
        // 161 -> right shift
        return 344;
    }
    if (vk_code == 162) {
        // 162 -> left control
        return 341;
    }
    if (vk_code == 163) {
        // 163 -> right control
        return 345;
    }
    // 164 -> left menu
    // 165 -> right menu
    // 166-183 -> windows media keys
    // 184-185 -> reserved
    // 186-192 -> windows 2000 keys
    // 193-215 -> reserved
    // 216-218 -> unassigned
    // 219-222 -> windows 2000 keys
    // 223 -> ?
    // 224 -> reserved
    // 225 -> OEM specific
    // 226 -> windows 2000 key
    // 227-228 -> OEM specific
    // 229 -> IME process key
    // 230 -> OEM specific
    // 231 -> used to pass unicode chars
    // 232 -> unassigned
    // 233-245 -> OEM specific
    // 246 -> attn
    // 247 -> crsel
    // 248 -> exsel
    // 249 -> erase EOF
    // 250 -> play
    // 251 -> zoom
    // 252 -> reserved
    // 253 -> pa1
    // 254 -> clear (oem)

    // Not supported yet
    return -2;
}