snippets for reading nes controller 1 input (using minifb)

neeze.h

// ...

    enum GAMEPAD_ID
    {
        GAMEPAD_1 = 0,
        GAMEPAD_2 = 1,
        GAMEPAD_MAX = GAMEPAD_2,
    };

    enum GAMEPAD_BUTTON
    {
        GAMEPAD_A      = 0,
        GAMEPAD_B      = 1,
        GAMEPAD_SELECT = 2,
        GAMEPAD_START  = 3,
        GAMEPAD_UP     = 4,
        GAMEPAD_DOWN   = 5,
        GAMEPAD_LEFT   = 6,
        GAMEPAD_RIGHT  = 7,
    };

    struct sys_t
    {
        // ...
        uint8_t gamepad_readbit;
        uint8_t gamepad[2];
        // ...
    };


// ...

neeze_mem.h

// ...

// handle register writes
inline unsigned char handle_memmap_reg_write(cpu_t &cpu, unsigned short addr, unsigned short data, bool *handled)
{
    // ...
    } else if (addr == 0x4016 || addr == 0x4017) {
        *handled = true;

        // todo need to check that it was bit 0 that was set??
        sys.gamepad_readbit = 0;
    }
    // ...
}

// ...

// handles register reads
inline unsigned char handle_memmap_reg_read(cpu_t &cpu, unsigned short addr, bool *handled, bool peek = false)
{
    // ...
    } else if (addr == 0x4016 || addr == 0x4017) {
        *handled = true;

        uint8_t gamepad_id_to_read = addr == 0x4016 ? 0 : 1;
        uint8_t data = (sys.gamepad[gamepad_id_to_read] >> sys.gamepad_readbit) & 0x1;

        sys.gamepad_readbit++;

        sys.gamepad_readbit = sys.gamepad_readbit % 8; // roll back to zero if going over 7

        return data | 0x40;
    }
    // ...
}

// ...

ppu_vis.c

// ...

// callback from when the window gets input
static void minifb_keyboard_cb(struct mfb_window *window, mfb_key key, mfb_key_mod mod, bool isPressed)
{
    neeze::sys_t* sysp = (neeze::sys_t*)mfb_get_user_data(window);
    // printf("%s %x\n", isPressed ? "PRESSED" : "RELEASED", key);
    switch (key) {
        case KB_KEY_ENTER:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_START, isPressed);
            break;
        case KB_KEY_SPACE:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_SELECT, isPressed);
            break;
        case KB_KEY_Z:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_A, isPressed);
            break;
        case KB_KEY_X:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_B, isPressed);
            break;
        case KB_KEY_LEFT:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_LEFT, isPressed);
            break;
        case KB_KEY_RIGHT:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_RIGHT, isPressed);
            break;
        case KB_KEY_UP:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_UP, isPressed);
            break;
        case KB_KEY_DOWN:
            neeze::set_input(*sysp, neeze::GAMEPAD_1, neeze::GAMEPAD_DOWN, isPressed);
            break;
        default:
            break;
    }
}

// ...