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Adds a simpler way of deferring single values.

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This commit is contained in:
Thomas Harte 2021-08-07 17:29:21 -04:00
parent 3255fc91fa
commit 6a15bb15ca
2 changed files with 50 additions and 0 deletions
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48
ClockReceiver/DeferredValue.hpp Normal file
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@ -0,0 +1,48 @@
//
// DeferredValue.hpp
// Clock Signal
//
// Created by Thomas Harte on 07/08/2021.
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#ifndef DeferredValue_h
#define DeferredValue_h
/*!
Provides storage for a single deferred value: one with a current value and a certain number
of future values.
*/
template <int DeferredDepth, typename ValueT> class DeferredValue {
private:
static_assert(sizeof(ValueT) <= 4);
constexpr int elements_per_uint32 = sizeof(uint32_t) / sizeof(ValueT);
constexpr int unit_shift = sizeof(ValueT) * 8;
constexpr int insert_shift = (DeferredDepth & (elements_per_uint32 - 1)) * unit_shift;
constexpr uint32_t insert_mask = ~(0xffff'ffff << insert_shift);
std::array<uint32_t, (DeferredDepth + elements_per_uint32 - 1) / elements_per_uint32> backlog;
public:
/// @returns the current value.
ValueT value() const {
return uint8_t(backlog[0]);
}
/// Advances to the next enqueued value.
void advance() {
for(size_t c = 0; c < backlog.size() - 1; c--) {
backlog[c] = (backlog[c] >> unit_shift) | (backlog[c+1] << (32 - unit_shift));
}
backlog[backlog.size() - 1] >>= unit_shift;
}
/// Inserts a new value, replacing whatever is currently at the end of the queue.
void insert(ValueT value) {
backlog[DeferredDepth / elements_per_uint32] =
(backlog[DeferredDepth / elements_per_uint32] & insert_mask) | (value << insert_shift);
}
};
#endif /* DeferredValue_h */

2
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -1585,6 +1585,7 @@
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4B98A1CD1FFADEC400ADF63B /* MSX ROMs */ = {isa = PBXFileReference; lastKnownFileType = folder; path = "MSX ROMs"; sourceTree = "<group>"; };
4B996B2D2496DAC2001660EF /* VSyncPredictor.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = VSyncPredictor.hpp; sourceTree = "<group>"; };
4B99EBD026BF2D9F00CA924D /* DeferredValue.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = DeferredValue.hpp; sourceTree = "<group>"; };
4B9BE3FE203A0C0600FFAE60 /* MultiSpeaker.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = MultiSpeaker.cpp; sourceTree = "<group>"; };
4B9BE3FF203A0C0600FFAE60 /* MultiSpeaker.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = MultiSpeaker.hpp; sourceTree = "<group>"; };
4B9D0C4A22C7D70900DE1AD3 /* 68000BCDTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = 68000BCDTests.mm; sourceTree = "<group>"; };
@ -4733,6 +4734,7 @@
4B644ED023F0FB55006C0CC5 /* ScanSynchroniser.hpp */,
4B449C942063389900A095C8 /* TimeTypes.hpp */,
4B996B2D2496DAC2001660EF /* VSyncPredictor.hpp */,
4B99EBD026BF2D9F00CA924D /* DeferredValue.hpp */,
);
name = ClockReceiver;
path = ../../ClockReceiver;