83 lines
2.6 KiB
C++
83 lines
2.6 KiB
C++
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#ifndef STAR_NET_ELEMENT_TOP_HPP
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#define STAR_NET_ELEMENT_TOP_HPP
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#include "StarNetElement.hpp"
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namespace Star {
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// Mixin for the NetElement that should be the top element for a network, wraps
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// any NetElement class and manages the NetElementVersion.
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template <typename BaseNetElement>
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class NetElementTop : public BaseNetElement {
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public:
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NetElementTop();
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// Returns the state update, combined with the version code that should be
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// passed to the next call to writeState. If 'fromVersion' is 0, then this
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// is a full write for an initial read of a slave NetElementTop.
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pair<ByteArray, uint64_t> writeNetState(uint64_t fromVersion = 0);
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// Reads a state produced by a call to writeState, optionally with the
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// interpolation delay time for the data contained in this state update. If
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// the state is a full update rather than a delta, the interoplation delay
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// will be ignored. Blank updates are not necessary to send to be read by
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// readState, *unless* extrapolation is enabled. If extrapolation is
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// enabled, reading a blank update calls 'blankNetDelta' which is necessary
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// to not improperly extrapolate past the end of incoming deltas.
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void readNetState(ByteArray data, float interpolationTime = 0.0);
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private:
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using BaseNetElement::initNetVersion;
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using BaseNetElement::netStore;
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using BaseNetElement::netLoad;
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using BaseNetElement::writeNetDelta;
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using BaseNetElement::readNetDelta;
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using BaseNetElement::blankNetDelta;
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NetElementVersion m_netVersion;
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};
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template <typename BaseNetElement>
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NetElementTop<BaseNetElement>::NetElementTop() {
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BaseNetElement::initNetVersion(&m_netVersion);
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}
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template <typename BaseNetElement>
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pair<ByteArray, uint64_t> NetElementTop<BaseNetElement>::writeNetState(uint64_t fromVersion) {
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if (fromVersion == 0) {
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DataStreamBuffer ds;
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ds.write<bool>(true);
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BaseNetElement::netStore(ds);
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m_netVersion.increment();
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return {ds.takeData(), m_netVersion.current()};
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} else {
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DataStreamBuffer ds;
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ds.write<bool>(false);
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if (!BaseNetElement::writeNetDelta(ds, fromVersion)) {
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return {ByteArray(), m_netVersion.current()};
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} else {
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m_netVersion.increment();
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return {ds.takeData(), m_netVersion.current()};
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}
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}
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}
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template <typename BaseNetElement>
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void NetElementTop<BaseNetElement>::readNetState(ByteArray data, float interpolationTime) {
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if (data.empty()) {
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BaseNetElement::blankNetDelta(interpolationTime);
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} else {
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DataStreamBuffer ds(move(data));
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if (ds.read<bool>())
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BaseNetElement::netLoad(ds);
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else
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BaseNetElement::readNetDelta(ds, interpolationTime);
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}
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}
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}
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#endif
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