mirror of https://github.com/TomHarte/CLK.git
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
//
|
|
// TimedEventLoop.cpp
|
|
// Clock Signal
|
|
//
|
|
// Created by Thomas Harte on 29/07/2016.
|
|
// Copyright 2016 Thomas Harte. All rights reserved.
|
|
//
|
|
|
|
#include "TimedEventLoop.hpp"
|
|
|
|
#include <algorithm>
|
|
#include <cassert>
|
|
#include <cmath>
|
|
|
|
using namespace Storage;
|
|
|
|
TimedEventLoop::TimedEventLoop(Cycles::IntType input_clock_rate) :
|
|
input_clock_rate_(input_clock_rate) {}
|
|
|
|
void TimedEventLoop::run_for(const Cycles cycles) {
|
|
auto remaining_cycles = cycles.as_integral();
|
|
#ifndef NDEBUG
|
|
decltype(remaining_cycles) cycles_advanced = 0;
|
|
#endif
|
|
|
|
while(cycles_until_event_ <= remaining_cycles) {
|
|
#ifndef NDEBUG
|
|
cycles_advanced += cycles_until_event_;
|
|
#endif
|
|
advance(cycles_until_event_);
|
|
remaining_cycles -= cycles_until_event_;
|
|
cycles_until_event_ = 0;
|
|
process_next_event();
|
|
}
|
|
|
|
if(remaining_cycles) {
|
|
cycles_until_event_ -= remaining_cycles;
|
|
#ifndef NDEBUG
|
|
cycles_advanced += remaining_cycles;
|
|
#endif
|
|
advance(remaining_cycles);
|
|
}
|
|
|
|
assert(cycles_advanced == cycles.as_integral());
|
|
assert(cycles_until_event_ > 0);
|
|
}
|
|
|
|
Cycles::IntType TimedEventLoop::get_cycles_until_next_event() const {
|
|
return std::max(cycles_until_event_, Cycles::IntType(0));
|
|
}
|
|
|
|
Cycles::IntType TimedEventLoop::get_input_clock_rate() const {
|
|
return input_clock_rate_;
|
|
}
|
|
|
|
void TimedEventLoop::reset_timer() {
|
|
subcycles_until_event_ = 0.0;
|
|
cycles_until_event_ = 0;
|
|
}
|
|
|
|
void TimedEventLoop::jump_to_next_event() {
|
|
reset_timer();
|
|
process_next_event();
|
|
}
|
|
|
|
void TimedEventLoop::set_next_event_time_interval(Time interval) {
|
|
set_next_event_time_interval(interval.get<float>());
|
|
}
|
|
|
|
void TimedEventLoop::set_next_event_time_interval(float interval) {
|
|
// Calculate [interval]*[input clock rate] + [subcycles until this event]
|
|
const float float_interval = interval * float(input_clock_rate_) + subcycles_until_event_;
|
|
|
|
// This event will fire in the integral number of cycles from now, putting us at the remainder
|
|
// number of subcycles.
|
|
const Cycles::IntType addition = Cycles::IntType(float_interval);
|
|
cycles_until_event_ += addition;
|
|
subcycles_until_event_ = fmodf(float_interval, 1.0f);
|
|
|
|
assert(cycles_until_event_ >= 0);
|
|
assert(subcycles_until_event_ >= 0.0f);
|
|
}
|
|
|
|
Time TimedEventLoop::get_time_into_next_event() {
|
|
// TODO: calculate, presumably as [length of interval] - ([cycles left] + [subcycles left])
|
|
Time zero;
|
|
return zero;
|
|
}
|