mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-23 18:31:53 +00:00
125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
//
|
|
// MouseJoystick.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 26/11/2021.
|
|
// Copyright © 2021 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "MouseJoystick.hpp"
|
|
|
|
#include <algorithm>
|
|
|
|
using namespace Amiga;
|
|
|
|
// MARK: - Mouse.
|
|
|
|
int Mouse::get_number_of_buttons() {
|
|
return 2;
|
|
}
|
|
|
|
void Mouse::set_button_pressed(int button, bool is_set) {
|
|
switch(button) {
|
|
case 0:
|
|
cia_state_ = (cia_state_ &~ 0x40) | (is_set ? 0 : 0x40);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
uint8_t Mouse::get_cia_button() const {
|
|
return cia_state_;
|
|
}
|
|
|
|
void Mouse::reset_all_buttons() {
|
|
cia_state_ = 0xff;
|
|
}
|
|
|
|
void Mouse::move(int x, int y) {
|
|
position_[0] += x;
|
|
position_[1] += y;
|
|
}
|
|
|
|
uint16_t Mouse::get_position() {
|
|
// The Amiga hardware retains only eight bits of position
|
|
// for the mouse; its software polls frequently and maps
|
|
// changes into a larger space.
|
|
//
|
|
// On modern computers with 5k+ displays and trackpads, it
|
|
// proved empirically possible to overflow the hardware
|
|
// counters more quickly than software would poll.
|
|
//
|
|
// Therefore the approach taken for mapping mouse motion
|
|
// into the Amiga is to do it in steps of no greater than
|
|
// [-128, +127], as per the below.
|
|
const int pending[] = {
|
|
position_[0], position_[1]
|
|
};
|
|
|
|
const int8_t change[] = {
|
|
int8_t(std::clamp(pending[0], -128, 127)),
|
|
int8_t(std::clamp(pending[1], -128, 127))
|
|
};
|
|
|
|
position_[0] -= change[0];
|
|
position_[1] -= change[1];
|
|
declared_position_[0] += change[0];
|
|
declared_position_[1] += change[1];
|
|
|
|
return uint16_t(
|
|
(declared_position_[1] << 8) |
|
|
declared_position_[0]
|
|
);
|
|
}
|
|
|
|
// MARK: - Joystick.
|
|
|
|
// TODO: add second fire button.
|
|
|
|
Joystick::Joystick() :
|
|
ConcreteJoystick({
|
|
Input(Input::Up),
|
|
Input(Input::Down),
|
|
Input(Input::Left),
|
|
Input(Input::Right),
|
|
Input(Input::Fire, 0),
|
|
}) {}
|
|
|
|
void Joystick::did_set_input(const Input &input, bool is_active) {
|
|
// Accumulate state.
|
|
inputs_[input.type] = is_active;
|
|
|
|
// Determine what that does to the two position bits.
|
|
const auto low =
|
|
(inputs_[Input::Type::Down] ^ inputs_[Input::Type::Right]) |
|
|
(inputs_[Input::Type::Right] << 1);
|
|
const auto high =
|
|
(inputs_[Input::Type::Up] ^ inputs_[Input::Type::Left]) |
|
|
(inputs_[Input::Type::Left] << 1);
|
|
|
|
// Ripple upwards if that affects the mouse position counters.
|
|
const uint8_t previous_low = position_ & 3;
|
|
uint8_t low_upper = (position_ >> 2) & 0x3f;
|
|
const uint8_t previous_high = (position_ >> 8) & 3;
|
|
uint8_t high_upper = (position_ >> 10) & 0x3f;
|
|
|
|
if(!low && previous_low == 3) ++low_upper;
|
|
if(!previous_low && low == 3) --low_upper;
|
|
if(!high && previous_high == 3) ++high_upper;
|
|
if(!previous_high && high == 3) --high_upper;
|
|
|
|
position_ = uint16_t(
|
|
low | ((low_upper & 0x3f) << 2) |
|
|
(high << 8) | ((high_upper & 0x3f) << 10)
|
|
);
|
|
}
|
|
|
|
uint16_t Joystick::get_position() {
|
|
return position_;
|
|
}
|
|
|
|
uint8_t Joystick::get_cia_button() const {
|
|
return inputs_[Input::Type::Fire] ? 0xbf : 0xff;
|
|
}
|