millfork/include/nes_joy.mfk

// standard joystick driver for NES

import joy
import nes_hardware

alias input_a = input_btn
byte input_b
byte input_select
byte input_start

macro void read_joy1() {
    nes_reset_joy()
    read_also_joy1()
}

macro void read_joy2() {
    nes_reset_joy()
    read_also_joy2()
}

void nes_reset_joy() {
	input_b = 0
	input_select = 0
	input_start = 0
	reset_joy()
}

inline void read_also_joy1() {
    strobe_joypad()
    __parse_nes_joypad(read_joypad1())
}

inline void read_also_joy2() {
    strobe_joypad()
    __parse_nes_joypad(read_joypad2())
}

void __parse_nes_joypad(byte b) {
    if read_joypad1() & 1 != 0 { input_a += 1 }
    if read_joypad1() & 1 != 0 { input_b += 1 }
    if read_joypad1() & 1 != 0 { input_select += 1 }
    if read_joypad1() & 1 != 0 { input_start += 1 }
    if read_joypad1() & 1 != 0 { input_dy -= 1 }
    if read_joypad1() & 1 != 0 { input_dy += 1 }
    if read_joypad1() & 1 != 0 { input_dx -= 1 }
    if read_joypad1() & 1 != 0 { input_dx += 1 }
}