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CLK/Machines/Apple/ADB/Mouse.cpp
2021-02-15 20:49:16 -05:00

63 lines
1.5 KiB
C++

//
// Mouse.cpp
// Clock Signal
//
// Created by Thomas Harte on 12/02/2021.
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#include "Mouse.hpp"
using namespace Apple::ADB;
Mouse::Mouse(Bus &bus) : ReactiveDevice(bus, 3) {}
void Mouse::perform_command(const Command &command) {
if(command.type == Command::Type::Talk && command.reg == 0) {
// Read current deltas and buttons, thread safely.
auto delta_x = delta_x_.exchange(0);
auto delta_y = delta_y_.exchange(0);
const int buttons = button_flags_;
// Clamp deltas.
delta_x = std::max(std::min(delta_x, int16_t(127)), int16_t(-128));
delta_y = std::max(std::min(delta_y, int16_t(127)), int16_t(-128));
// Figure out what that would look like, and don't respond if there's
// no change to report.
const uint16_t reg0 =
((buttons & 1) ? 0x0000 : 0x8000) |
((buttons & 2) ? 0x0000 : 0x0080) |
uint16_t(delta_x & 0x7f) |
uint16_t((delta_y & 0x7f) << 8);
if(reg0 == last_posted_reg0_) return;
// Post change.
last_posted_reg0_ = reg0;
post_response({uint8_t(reg0 >> 8), uint8_t(reg0)});
}
}
void Mouse::move(int x, int y) {
delta_x_ += int16_t(x);
delta_y_ += int16_t(y);
post_service_request();
}
int Mouse::get_number_of_buttons() {
return 2;
}
void Mouse::set_button_pressed(int index, bool is_pressed) {
if(is_pressed)
button_flags_ |= (1 << index);
else
button_flags_ &= ~(1 << index);
post_service_request();
}
void Mouse::reset_all_buttons() {
button_flags_ = 0;
post_service_request();
}