1 // license:BSD-3-Clause 2 // copyright-holders:Philip Bennett 3 /************************************************************************* 4 5 Microprose Games 3D hardware 6 7 *************************************************************************/ 8 #ifndef MAME_AUDIO_MICRO3D_H 9 #define MAME_AUDIO_MICRO3D_H 10 11 #pragma once 12 13 class micro3d_sound_device : public device_t, public device_sound_interface 14 { 15 public: 16 micro3d_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock = 0); 17 dac_w(u8 data)18 void dac_w(u8 data) { m_dac_data = data; } 19 void noise_sh_w(u8 data); 20 21 protected: 22 // device-level overrides 23 virtual void device_start() override; 24 virtual void device_reset() override; 25 26 // sound stream update overrides 27 virtual void sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) override; 28 29 private: 30 enum dac_registers { 31 VCF, 32 VCQ, 33 VCA, 34 PAN 35 }; 36 37 struct biquad 38 { 39 double a0, a1, a2; /* Numerator coefficients */ 40 double b0, b1, b2; /* Denominator coefficients */ 41 }; 42 43 struct lp_filter 44 { 45 void init(double fs); 46 void recompute(double k, double q, double fc); 47 48 float history[2 * 2]; 49 float coef[4 * 2 + 1]; 50 double fs; 51 biquad proto_coef[2]; 52 }; 53 54 struct m3d_filter_state 55 { 56 void configure(double r, double c); 57 58 double capval; 59 double exponent; 60 }; 61 62 u8 m_dac_data; 63 64 u8 m_dac[4]; 65 66 float m_gain; 67 u32 m_noise_shift; 68 u8 m_noise_value; 69 u8 m_noise_subcount; 70 71 m3d_filter_state m_noise_filters[4]; 72 lp_filter m_filter; 73 sound_stream *m_stream; 74 }; 75 76 DECLARE_DEVICE_TYPE(MICRO3D_SOUND, micro3d_sound_device) 77 78 #endif // MAME_AUDIO_MICRO3D_H 79