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77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
//
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// Mouse.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 12/02/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#include "Mouse.hpp"
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#include <algorithm>
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using namespace Apple::ADB;
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Mouse::Mouse(Bus &bus) : ReactiveDevice(bus, 3) {}
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void Mouse::perform_command(const Command &command) {
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// Mouse deltas are confined to a seven-bit signed field; this implementation keeps things symmetrical by
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// limiting them to a maximum absolute value of 63 in any direction.
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static constexpr int16_t max_delta = 63;
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if(command.type == Command::Type::Talk && command.reg == 0) {
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// Read and clamp current deltas and buttons.
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//
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// There's some small chance of creating negative feedback here — taking too much off delta_x_ or delta_y_
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// due to a change in the underlying value between the load and the arithmetic. But if that occurs it means
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// the user moved the mouse again in the interim, so it'll just play out as very slight latency.
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auto delta_x = delta_x_.load(std::memory_order::memory_order_relaxed);
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auto delta_y = delta_y_.load(std::memory_order::memory_order_relaxed);
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if(abs(delta_x) > max_delta || abs(delta_y) > max_delta) {
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int max = std::max(abs(delta_x), abs(delta_y));
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delta_x = delta_x * max_delta / max;
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delta_y = delta_y * max_delta / max;
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}
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const int buttons = button_flags_.load(std::memory_order::memory_order_relaxed);
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delta_x_ -= delta_x;
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delta_y_ -= delta_y;
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// Figure out what that would look like, and don't respond if there's
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// no change or deltas to report.
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const uint16_t reg0 =
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((buttons & 1) ? 0x0000 : 0x8000) |
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((buttons & 2) ? 0x0000 : 0x0080) |
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uint16_t(delta_x & 0x7f) |
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uint16_t((delta_y & 0x7f) << 8);
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if(!(reg0 & 0x7f7f) && (reg0 & 0x8080) == (last_posted_reg0_ & 0x8080)) return;
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// Post change.
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last_posted_reg0_ = reg0;
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post_response({uint8_t(reg0 >> 8), uint8_t(reg0)});
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}
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}
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void Mouse::move(int x, int y) {
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delta_x_ += int16_t(x);
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delta_y_ += int16_t(y);
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post_service_request();
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}
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int Mouse::get_number_of_buttons() {
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return 2;
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}
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void Mouse::set_button_pressed(int index, bool is_pressed) {
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if(is_pressed)
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button_flags_ |= (1 << index);
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else
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button_flags_ &= ~(1 << index);
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post_service_request();
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}
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void Mouse::reset_all_buttons() {
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button_flags_ = 0;
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post_service_request();
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}
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