openMSX
SN76489.hh
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1#ifndef SN76489_HH
2#define SN76489_HH
3
5#include "SimpleDebuggable.hh"
6
7namespace openmsx {
8
24class SN76489 final : public ResampledSoundDevice
25{
26public:
27 SN76489(const DeviceConfig& config);
28 ~SN76489();
29
30 // ResampledSoundDevice
31 void generateChannels(float** buffers, unsigned num) override;
32
33 void reset(EmuTime::param time);
34 void write(byte value, EmuTime::param time);
35
36 template<typename Archive>
37 void serialize(Archive& ar, unsigned version);
38
39private:
40 class NoiseShifter {
41 public:
45 inline void initState(unsigned pattern, unsigned period);
46
49 [[nodiscard]] inline unsigned getOutput() const;
50
53 inline void advance();
54
58 inline void queueAdvance(unsigned steps);
59
62 void catchUp();
63
64 template<typename Archive>
65 void serialize(Archive& ar, unsigned version);
66
67 private:
68 unsigned pattern;
69 unsigned period;
70 unsigned random;
71 unsigned stepsBehind;
72 };
73
76 void initState();
77
81 void initNoise();
82
83 [[nodiscard]] word peekRegister(unsigned reg, EmuTime::param time) const;
84 void writeRegister(unsigned reg, word value, EmuTime::param time);
85 template<bool NOISE> void synthesizeChannel(
86 float*& buffer, unsigned num, unsigned generator);
87
88private:
89 NoiseShifter noiseShifter;
90
94 word regs[8];
95
98 byte registerLatch;
99
104 word counters[4];
105
108 byte outputs[4];
109
110 struct Debuggable final : SimpleDebuggable {
111 Debuggable(MSXMotherBoard& motherBoard, const std::string& name);
112 [[nodiscard]] byte read(unsigned address, EmuTime::param time) override;
113 void write(unsigned address, byte value, EmuTime::param time) override;
114 } debuggable;
115};
116
117} // namespace openmsx
118
119#endif
This class implements the Texas Instruments SN76489 sound chip.
Definition: SN76489.hh:25
void generateChannels(float **buffers, unsigned num) override
Abstract method to generate the actual sound data.
Definition: SN76489.cc:286
void serialize(Archive &ar, unsigned version)
Definition: SN76489.cc:308
void reset(EmuTime::param time)
Definition: SN76489.cc:140
void write(byte value, EmuTime::param time)
Definition: SN76489.cc:146
SN76489(const DeviceConfig &config)
Definition: SN76489.cc:91
This file implemented 3 utility functions:
Definition: Autofire.cc:9
uint16_t word
16 bit unsigned integer
Definition: openmsx.hh:29
void advance(octet_iterator &it, distance_type n, octet_iterator end)