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// license:BSD-3-Clause
// copyright-holders:Philip Bennett
/*************************************************************************
Microprose Games 3D hardware
*************************************************************************/
#ifndef MAME_AUDIO_MICRO3D_H
#define MAME_AUDIO_MICRO3D_H
#pragma once
class micro3d_sound_device : public device_t, public device_sound_interface
{
public:
micro3d_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0);
void dac_w(u8 data) { m_dac_data = data; }
void noise_sh_w(u8 data);
protected:
// device-level overrides
virtual void device_start() override;
virtual void device_reset() override;
// sound stream update overrides
virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override;
private:
enum dac_registers {
VCF,
VCQ,
VCA,
PAN
};
struct biquad
{
double a0, a1, a2; /* Numerator coefficients */
double b0, b1, b2; /* Denominator coefficients */
};
struct lp_filter
{
void init(double fs);
void recompute(double k, double q, double fc);
float history[2 * 2];
float coef[4 * 2 + 1];
double fs;
biquad proto_coef[2];
};
struct m3d_filter_state
{
void configure(double r, double c);
double capval;
double exponent;
};
u8 m_dac_data;
u8 m_dac[4];
float m_gain;
u32 m_noise_shift;
u8 m_noise_value;
u8 m_noise_subcount;
m3d_filter_state m_noise_filters[4];
lp_filter m_filter;
sound_stream *m_stream;
};
DECLARE_DEVICE_TYPE(MICRO3D_SOUND, micro3d_sound_device)
#endif // MAME_AUDIO_MICRO3D_H
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