osb/source/core/StarNetElementBasicFields.hpp

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#pragma once
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#include <type_traits>
#include "StarNetElement.hpp"
#include "StarString.hpp"
#include "StarByteArray.hpp"
namespace Star {
template <typename T>
class NetElementBasicField : public NetElement {
public:
virtual ~NetElementBasicField() = default;
T const& get() const;
// Updates the value if the value is different than the existing value,
// requires T have operator==
void set(T const& value);
// Always updates the value and marks it as updated.
void push(T value);
// Has this field been updated since the last call to pullUpdated?
bool pullUpdated();
// Update the value in place. The mutator will be called as bool
// mutator(T&), return true to signal that the value was updated.
template <typename Mutator>
void update(Mutator&& mutator);
void initNetVersion(NetElementVersion const* version = nullptr) override;
// Values are never interpolated, but they will be delayed for the given
// interpolationTime.
void enableNetInterpolation(float extrapolationHint = 0.0f) override;
void disableNetInterpolation() override;
void tickNetInterpolation(float dt) override;
void netStore(DataStream& ds) const override;
void netLoad(DataStream& ds) override;
bool writeNetDelta(DataStream& ds, uint64_t fromVersion) const override;
void readNetDelta(DataStream& ds, float interpolationTime = 0.0f) override;
protected:
virtual void readData(DataStream& ds, T& t) const = 0;
virtual void writeData(DataStream& ds, T const& t) const = 0;
virtual void updated();
private:
NetElementVersion const* m_netVersion = nullptr;
uint64_t m_latestUpdateVersion = 0;
T m_value = T();
bool m_updated = false;
Maybe<Deque<pair<float, T>>> m_pendingInterpolatedValues;
};
template <typename T>
class NetElementIntegral : public NetElementBasicField<T> {
protected:
void readData(DataStream& ds, T& v) const override;
void writeData(DataStream& ds, T const& v) const override;
};
typedef NetElementIntegral<int64_t> NetElementInt;
typedef NetElementIntegral<uint64_t> NetElementUInt;
// Properly encodes NPos no matter the platform width of size_t NetElement
// size_t values are NOT clamped when setting.
class NetElementSize : public NetElementBasicField<size_t> {
protected:
void readData(DataStream& ds, size_t& v) const override;
void writeData(DataStream& ds, size_t const& v) const override;
};
class NetElementBool : public NetElementBasicField<bool> {
protected:
void readData(DataStream& ds, bool& v) const override;
void writeData(DataStream& ds, bool const& v) const override;
};
template <typename Enum>
class NetElementEnum : public NetElementBasicField<Enum> {
protected:
void readData(DataStream& ds, Enum& v) const override;
void writeData(DataStream& ds, Enum const& v) const override;
};
// Wraps a uint64_t to give a simple event stream. Every trigger is an
// increment to a held uint64_t value, and slaves can see how many triggers
// have occurred since the last check.
class NetElementEvent : public NetElementUInt {
public:
void trigger();
// Returns the number of times this event has been triggered since the last
// pullOccurrences call.
uint64_t pullOccurrences();
// Pulls whether this event occurred at all, ignoring the number
bool pullOccurred();
// Ignore all the existing ocurrences
void ignoreOccurrences();
void setIgnoreOccurrencesOnNetLoad(bool ignoreOccurrencesOnNetLoad);
void netLoad(DataStream& ds) override;
protected:
void updated() override;
private:
using NetElementUInt::get;
using NetElementUInt::set;
using NetElementUInt::push;
using NetElementUInt::update;
uint64_t m_pulledOccurrences = 0;
bool m_ignoreOccurrencesOnNetLoad = false;
};
// Holds an arbitrary serializable value
template <typename T>
class NetElementData : public NetElementBasicField<T> {
public:
NetElementData();
NetElementData(function<void(DataStream&, T&)> reader, function<void(DataStream&, T const&)> writer);
protected:
void readData(DataStream& ds, T& v) const override;
void writeData(DataStream& ds, T const& v) const override;
private:
function<void(DataStream&, T&)> m_reader;
function<void(DataStream&, T const&)> m_writer;
};
typedef NetElementData<String> NetElementString;
typedef NetElementData<ByteArray> NetElementBytes;
template <typename T>
T const& NetElementBasicField<T>::get() const {
return m_value;
}
template <typename T>
void NetElementBasicField<T>::set(T const& value) {
if (!(m_value == value))
push(value);
}
template <typename T>
void NetElementBasicField<T>::push(T value) {
m_value = std::move(value);
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updated();
m_latestUpdateVersion = m_netVersion ? m_netVersion->current() : 0;
if (m_pendingInterpolatedValues)
m_pendingInterpolatedValues->clear();
}
template <typename T>
bool NetElementBasicField<T>::pullUpdated() {
return take(m_updated);
}
template <typename T>
template <typename Mutator>
void NetElementBasicField<T>::update(Mutator&& mutator) {
if (mutator(m_value)) {
updated();
m_latestUpdateVersion = m_netVersion ? m_netVersion->current() : 0;
if (m_pendingInterpolatedValues)
m_pendingInterpolatedValues->clear();
}
}
template <typename T>
void NetElementBasicField<T>::initNetVersion(NetElementVersion const* version) {
m_netVersion = version;
m_latestUpdateVersion = 0;
}
template <typename T>
void NetElementBasicField<T>::enableNetInterpolation(float) {
if (!m_pendingInterpolatedValues)
m_pendingInterpolatedValues.emplace();
}
template <typename T>
void NetElementBasicField<T>::disableNetInterpolation() {
if (m_pendingInterpolatedValues) {
if (!m_pendingInterpolatedValues->empty())
m_value = m_pendingInterpolatedValues->takeLast().second;
m_pendingInterpolatedValues.reset();
}
}
template <typename T>
void NetElementBasicField<T>::tickNetInterpolation(float dt) {
if (m_pendingInterpolatedValues) {
for (auto& p : *m_pendingInterpolatedValues)
p.first -= dt;
while (!m_pendingInterpolatedValues->empty() && m_pendingInterpolatedValues->first().first <= 0.0f) {
m_value = m_pendingInterpolatedValues->takeFirst().second;
updated();
}
}
}
template <typename T>
void NetElementBasicField<T>::netStore(DataStream& ds) const {
if (m_pendingInterpolatedValues && !m_pendingInterpolatedValues->empty())
writeData(ds, m_pendingInterpolatedValues->last().second);
else
writeData(ds, m_value);
}
template <typename T>
void NetElementBasicField<T>::netLoad(DataStream& ds) {
readData(ds, m_value);
m_latestUpdateVersion = m_netVersion ? m_netVersion->current() : 0;
updated();
if (m_pendingInterpolatedValues)
m_pendingInterpolatedValues->clear();
}
template <typename T>
bool NetElementBasicField<T>::writeNetDelta(DataStream& ds, uint64_t fromVersion) const {
if (m_latestUpdateVersion < fromVersion)
return false;
if (m_pendingInterpolatedValues && !m_pendingInterpolatedValues->empty())
writeData(ds, m_pendingInterpolatedValues->last().second);
else
writeData(ds, m_value);
return true;
}
template <typename T>
void NetElementBasicField<T>::readNetDelta(DataStream& ds, float interpolationTime) {
T t;
readData(ds, t);
m_latestUpdateVersion = m_netVersion ? m_netVersion->current() : 0;
if (m_pendingInterpolatedValues) {
// Only append an incoming delta to our pending value list if the incoming
// step is forward in time of every other pending value. In any other
// case, this is an error or the step tracking is wildly off, so just clear
// any other incoming values.
if (interpolationTime > 0.0f && (m_pendingInterpolatedValues->empty() || interpolationTime >= m_pendingInterpolatedValues->last().first)) {
m_pendingInterpolatedValues->append({interpolationTime, std::move(t)});
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} else {
m_value = std::move(t);
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m_pendingInterpolatedValues->clear();
updated();
}
} else {
m_value = std::move(t);
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updated();
}
}
template <typename T>
void NetElementBasicField<T>::updated() {
m_updated = true;
}
template <typename T>
void NetElementIntegral<T>::readData(DataStream& ds, T& v) const {
if (sizeof(T) == 1) {
ds.read(v);
} else {
if (std::is_unsigned<T>::value)
v = ds.readVlqU();
else
v = ds.readVlqI();
}
}
template <typename T>
void NetElementIntegral<T>::writeData(DataStream& ds, T const& v) const {
if (sizeof(T) == 1) {
ds.write(v);
} else {
if (std::is_unsigned<T>::value)
ds.writeVlqU(v);
else
ds.writeVlqI(v);
}
}
template <typename Enum>
void NetElementEnum<Enum>::readData(DataStream& ds, Enum& v) const {
if (sizeof(Enum) == 1)
ds.read(v);
else
v = (Enum)ds.readVlqI();
}
template <typename Enum>
void NetElementEnum<Enum>::writeData(DataStream& ds, Enum const& v) const {
if (sizeof(Enum) == 1)
ds.write(v);
else
ds.writeVlqI((int64_t)v);
}
template <typename T>
NetElementData<T>::NetElementData()
: NetElementData([](DataStream& ds, T & t) { ds >> t; }, [](DataStream& ds, T const& t) { ds << t; }) {}
template <typename T>
NetElementData<T>::NetElementData(function<void(DataStream&, T&)> reader, function<void(DataStream&, T const&)> writer)
: m_reader(std::move(reader)), m_writer(std::move(writer)) {}
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template <typename T>
void NetElementData<T>::readData(DataStream& ds, T& v) const {
m_reader(ds, v);
}
template <typename T>
void NetElementData<T>::writeData(DataStream& ds, T const& v) const {
m_writer(ds, v);
}
}