c64_kbd_mapping.h

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/* Part of the Xemu project, please visit: https://github.com/lgblgblgb/xemu
   Copyright (C)2016-2020 LGB (Gábor Lénárt) <lgblgblgb@gmail.com>
 
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
 
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */
 
#ifndef __XEMU_COMMON_C64_KBD_MAPPING
#define __XEMU_COMMON_C64_KBD_MAPPING
 
// Keyboard position of "shift" which is "virtually pressed" ie for cursor up/left
#define VIRTUAL_SHIFT_POS       0x64
 
#define LSHIFT_KEY_POS          0x17
#define RSHIFT_KEY_POS          0x64
#define CBM_KEY_POS             0x75
#define CTRL_KEY_POS            0x72
 
#define IS_KEY_PRESSED(pos)     (!(kbd_matrix[(pos) >> 4] & (1 << ((pos) & 7))))
 
#define RESTORE_KEY_POS         0x80
#define CAPSLOCK_KEY_POS        0x81
#define IS_RESTORE_PRESSED()    IS_KEY_PRESSED(RESTORE_KEY_POS)
//#define IS_RESTORE_PRESSED()  (!(kbd_matrix[RESTORE_KEY_POS >> 4] & (1 << (RESTORE_KEY_POS & 7))))
 
#ifdef C65_KEYBOARD
#define C65_KEYBOARD_EXTRA_POS  0x90
#define SCRL_KEY_POS            (C65_KEYBOARD_EXTRA_POS + 0)
#define TAB_KEY_POS             (C65_KEYBOARD_EXTRA_POS + 1)
#define ALT_KEY_POS             (C65_KEYBOARD_EXTRA_POS + 2)
#endif
 
extern const struct KeyMappingDefault c64_key_map[];
extern int joystick_emu;
 
extern Uint8 c64_get_joy_state  ( void );
extern void  c64_toggle_joy_emu ( void );
 
static XEMU_INLINE Uint8 c64_keyboard_read_on_CIA1_B ( Uint8 kbsel_a, Uint8 effect_b, Uint8 joy_state
#ifdef C65_KEYBOARD
        , int kbsel_c65_special
#endif
)
{
        // selected line(s) for scan: LOW pin state on port A, while reading in port B
        // CIA uses pull-ups, output can be LOW only, if port data is zero, and ddr is output (thus being 1)
        // so the "caller" of this func will do something like this:
        // kbsel_a = cia1.PRA | (~cia1.DDRA)
        // effect_b = cia1.PRB | (~cia1.DDRB)
        // the second is needed: the read value is still low, if the port we're reading on is configured for output with port value set 0
        //DEBUGPRINT("USING#1, extra row = %02X" NL, kbd_matrix[(C65_KEYBOARD_EXTRA_POS) >> 4]);
        return
#ifdef C65_KEYBOARD
                ((kbsel_c65_special) ? 0xFF : kbd_matrix[(C65_KEYBOARD_EXTRA_POS) >> 4]) &
#endif
                ((kbsel_a &   1) ? 0xFF : kbd_matrix[0]) &
                ((kbsel_a &   2) ? 0xFF : kbd_matrix[1]) &
                ((kbsel_a &   4) ? 0xFF : kbd_matrix[2]) &
                ((kbsel_a &   8) ? 0xFF : kbd_matrix[3]) &
                ((kbsel_a &  16) ? 0xFF : kbd_matrix[4]) &
                ((kbsel_a &  32) ? 0xFF : kbd_matrix[5]) &
                ((kbsel_a &  64) ? 0xFF : kbd_matrix[6]) &
                ((kbsel_a & 128) ? 0xFF : kbd_matrix[7]) &
                joy_state &
                effect_b
        ;
}
 
static XEMU_INLINE Uint8 c64_keyboard_read_on_CIA1_A ( Uint8 kbsel_b, Uint8 effect_a, Uint8 joy_state )
{
        // For description on this logic, please see comments at c64_keyboard_read_on_CIA1_B() above.
        // The theory is the same, however here we use the negated value. it's not because it's different by hardware
        // but because we handle kbsel_b value differently than with c64_keyboard_read_on_CIA1_B(), that's all!
        kbsel_b = ~kbsel_b;
        return (
#ifdef C65_KEYBOARD
#endif
                (((kbd_matrix[0] & kbsel_b) == kbsel_b) ?   1 : 0) |
                (((kbd_matrix[1] & kbsel_b) == kbsel_b) ?   2 : 0) |
                (((kbd_matrix[2] & kbsel_b) == kbsel_b) ?   4 : 0) |
                (((kbd_matrix[3] & kbsel_b) == kbsel_b) ?   8 : 0) |
                (((kbd_matrix[4] & kbsel_b) == kbsel_b) ?  16 : 0) |
                (((kbd_matrix[5] & kbsel_b) == kbsel_b) ?  32 : 0) |
                (((kbd_matrix[6] & kbsel_b) == kbsel_b) ?  64 : 0) |
                (((kbd_matrix[7] & kbsel_b) == kbsel_b) ? 128 : 0)
        ) &
                joy_state &
                effect_a
        ;
}
 
#ifdef FAKE_TYPING_SUPPORT
 
#ifdef C65_FAKE_TYPING_LOAD_SEQS
extern const Uint8 fake_typing_for_go64[];
extern const Uint8 fake_typing_for_load64[];
extern const Uint8 fake_typing_for_load65[];
#endif
 
extern void c64_register_fake_typing            ( const Uint8 *keys );
extern void c64_stop_fake_typing                ( void  );
extern void c64_handle_fake_typing_internals    ( Uint8 keysel );
 
extern int  c64_fake_typing_enabled;
 
#endif
 
#endif