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109 lines
2.7 KiB
109 lines
2.7 KiB
1 year ago
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/*
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SoLoud audio engine
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Copyright (c) 2015 Jari Komppa
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VIC 6560/6561 sound chip emulator
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Copyright (c) 2015 Petri Hakkinen
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source
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distribution.
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*/
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#ifndef SOLOUD_VIC_H
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#define SOLOUD_VIC_H
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#include "soloud.h"
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/*
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A very bare bones emulator for Commodore VIC-20 sound chip. Supports both PAL and NTSC models.
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Bass, alto and soprano should be quite close to original vic, noise probably not so.
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The first three channels (bass, alto and soprano) are square waveform generators with 7-bit frequency.
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The highest bit of each oscillator register switches the oscillator on/off.
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The fourth oscillator generates a noise waveform.
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VIC-20 does not have per channel volume control, only global volume,
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which you can change by setting audio source's volume.
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To get that authentic moldy VIC-20 sound, the audio source should be coupled with a biquad resonant filter
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with the following params: type = LOWPASS, sample rate = 44100, frequency = 1500, resonance = 2.0.
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*/
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namespace SoLoud
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{
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class Vic;
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class VicInstance : public AudioSourceInstance
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{
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public:
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VicInstance(Vic *aParent);
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~VicInstance();
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virtual unsigned int getAudio(float *aBuffer, unsigned int aSamplesToRead, unsigned int aBufferSize);
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virtual bool hasEnded();
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public:
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Vic* m_parent;
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unsigned int m_phase[4];
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unsigned int m_noisePos;
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};
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class Vic : public AudioSource
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{
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public:
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// VIC model
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enum
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{
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PAL = 0,
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NTSC
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};
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// VIC sound registers
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enum
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{
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BASS = 0,
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ALTO,
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SOPRANO,
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NOISE,
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MAX_REGS
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};
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Vic();
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virtual ~Vic();
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void setModel(int model);
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int getModel() const;
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void setRegister(int reg, unsigned char value);
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unsigned char getRegister(int reg);
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public:
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virtual AudioSourceInstance *createInstance();
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int m_model;
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float m_clocks[4]; // base clock frequencies for oscillators, dependent on VIC model
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unsigned char m_regs[MAX_REGS];
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unsigned char m_noise[8192];
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};
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};
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#endif
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