81 lines
3.1 KiB
C++
81 lines
3.1 KiB
C++
#ifndef __JABYENGINE_HIGH_RES_TIMER_HPP__
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#define __JABYENGINE_HIGH_RES_TIMER_HPP__
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#include "../jabyengine_defines.hpp"
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#include <PSX/System/IOPorts/interrupt_io.hpp>
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#include <PSX/System/IOPorts/timer_io.hpp>
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namespace JabyEngine {
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struct CPUTicks {
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static constexpr double Frequency_Hz = 33868800.0;
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static constexpr double Frequency_Hz_Div8 = (Frequency_Hz/8.0);
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template<typename T>
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static constexpr T ticks_per_ns(double CPU_Frequency_Hz, double time = 1.0) {
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return static_cast<T>((time/CPU_Frequency_Hz)*1000.0*1000.0*1000.0);
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}
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template<typename T>
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static constexpr T ticks_per_us(double CPU_Frequency_Hz, double time = 1.0) {
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return static_cast<T>(((time*1000.0)/ticks_per_ns<double>(CPU_Frequency_Hz)));
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}
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template<typename T>
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static constexpr T ticks_per_ms(double CPU_Frequency_Hz, double time = 1.0) {
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return static_cast<T>(((time*1000.0*1000.0)/ticks_per_ns<double>(CPU_Frequency_Hz)));
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}
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};
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class HighResTime {
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public:
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class TimeStamp {
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private:
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uint16_t counter_10ms_value;
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uint16_t fraction;
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constexpr TimeStamp(uint16_t counter_10ms_value, uint16_t fraction) : counter_10ms_value(counter_10ms_value), fraction(fraction) {
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}
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constexpr static size_t to_us(uint16_t counter_10ms_value, uint16_t fraction) {
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return counter_10ms_value*(10*1000) + ((fraction/HighResTime::TicksFor100us)*100);
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}
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constexpr static size_t to_ms(uint16_t counter_10ms_value, uint16_t fraction) {
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return counter_10ms_value*10 + (fraction/HighResTime::TicksFor1ms);
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}
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public:
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constexpr size_t microseconds_to(const TimeStamp& end) const {
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return TimeStamp::to_us((end.counter_10ms_value - this->counter_10ms_value), (end.fraction - this->fraction));
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}
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constexpr size_t milliseconds_to(const TimeStamp& end) const {
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return TimeStamp::to_ms((end.counter_10ms_value - this->counter_10ms_value), (end.fraction - this->fraction));
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}
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friend class HighResTime;
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};
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__friends:
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static constexpr uint16_t TicksFor100us = CPUTicks::ticks_per_us<uint16_t>(CPUTicks::Frequency_Hz_Div8, 100.0);
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static constexpr uint16_t TicksFor1ms = CPUTicks::ticks_per_ms<uint16_t>(CPUTicks::Frequency_Hz_Div8, 1.0);
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static constexpr uint16_t TicksFor10ms = CPUTicks::ticks_per_ms<uint16_t>(CPUTicks::Frequency_Hz_Div8, 10.0);
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static volatile uint16_t global_counter_10ms;
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public:
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HighResTime() = delete;
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~HighResTime() = delete;
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static void enable() {
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Interrupt::enable_irq(Interrupt::Timer2);
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}
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static void disable() {
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Interrupt::disable_irq(Interrupt::Timer2);
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}
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static TimeStamp get_time_stamp() {
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return TimeStamp(HighResTime::global_counter_10ms, Timer_IO::Counter2.get_current_value());
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}
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};
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}
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#endif //!__JABYENGINE_HIGH_RES_TIMER_HPP__
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