z80/zx_ula.cpp

#include "zx_ula.h"
#include <SDL2/SDL.h>

namespace zx_ula
{
    static uint8_t border_color = 0;
    static uint8_t ear = 0;
    static uint8_t mic = 0;

    int port_in(int port)
    {
        const uint8_t *keys = SDL_GetKeyboardState(NULL);
        const uint8_t h_addr = (port>>8);
        uint8_t result = 0xff;
        if (!(h_addr & ~0xfe))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_LSHIFT]*0x01 +
                        keys[SDL_SCANCODE_Z]*0x02 +
                        keys[SDL_SCANCODE_X]*0x04 +
                        keys[SDL_SCANCODE_C]*0x08 +
                        keys[SDL_SCANCODE_V]*0x10 );
        }
        if (!(h_addr & ~0xfd))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_A]*0x01 +
                        keys[SDL_SCANCODE_S]*0x02 +
                        keys[SDL_SCANCODE_D]*0x04 +
                        keys[SDL_SCANCODE_F]*0x08 +
                        keys[SDL_SCANCODE_G]*0x10 );
        }
        if (!(h_addr & ~0xfb))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_Q]*0x01 +
                        keys[SDL_SCANCODE_W]*0x02 +
                        keys[SDL_SCANCODE_E]*0x04 +
                        keys[SDL_SCANCODE_R]*0x08 +
                        keys[SDL_SCANCODE_T]*0x10 );
        }
        if (!(h_addr & ~0xf7))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_1]*0x01 +
                        keys[SDL_SCANCODE_2]*0x02 +
                        keys[SDL_SCANCODE_3]*0x04 +
                        keys[SDL_SCANCODE_4]*0x08 +
                        keys[SDL_SCANCODE_5]*0x10 );
        }
        if (!(h_addr & ~0xef))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_0]*0x01 +
                        keys[SDL_SCANCODE_9]*0x02 +
                        keys[SDL_SCANCODE_8]*0x04 +
                        keys[SDL_SCANCODE_7]*0x08 +
                        keys[SDL_SCANCODE_6]*0x10 );
        }
        if (!(h_addr & ~0xdf))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_P]*0x01 +
                        keys[SDL_SCANCODE_O]*0x02 +
                        keys[SDL_SCANCODE_I]*0x04 +
                        keys[SDL_SCANCODE_U]*0x08 +
                        keys[SDL_SCANCODE_Y]*0x10 );
        }
        if (!(h_addr & ~0xbf))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_RETURN]*0x01 +
                        keys[SDL_SCANCODE_L]*0x02 +
                        keys[SDL_SCANCODE_K]*0x04 +
                        keys[SDL_SCANCODE_J]*0x08 +
                        keys[SDL_SCANCODE_H]*0x10 );
        }
        if (!(h_addr & ~0x7f))
        {
            result &= ~( 
                        keys[SDL_SCANCODE_SPACE]*0x01 +
                        keys[SDL_SCANCODE_RSHIFT]*0x02 +
                        keys[SDL_SCANCODE_M]*0x04 +
                        keys[SDL_SCANCODE_N]*0x08 +
                        keys[SDL_SCANCODE_B]*0x10 );
        }
        return result;
    }

    void port_out(int port, int val)
    {
        border_color = val & 0x7;
        mic = (val>>3)&0x1;
        ear = (val>>4)&0x1;
    }

    uint8_t get_border_color() { return border_color; }
}