// license:BSD-3-Clause // copyright-holders:cam900, Brad Smith, Brezza /*************************************************************************** Ricoh RP2C33 Sound emulation ***************************************************************************/ #ifndef MAME_MACHINE_RP2C33_SND_H #define MAME_MACHINE_RP2C33_SND_H #pragma once #include //************************************************************************** // TYPE DEFINITIONS //************************************************************************** // ======================> rp2c33_sound_device class rp2c33_sound_device : public device_t, public device_sound_interface { public: static constexpr feature_type imperfect_features() { return feature::SOUND; } // one or more features are not verified, and possibly incorrect // construction/destruction rp2c33_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, u32 clock); // host interface void write(offs_t offset, u8 data); u8 read(offs_t offset); // wavetable handlers void wave_w(offs_t offset, u8 data) { if (m_wave_write) { m_stream->update(); m_wave[offset & 0x3f] = data & 0x3f; } } u8 wave_r(offs_t offset) { return (m_wave[offset & 0x3f] & 0x3f) | 0x40; } // TODO: bit 6-7 is open bus? not allowed when wave is not halted? protected: // device-level overrides virtual void device_start() override; virtual void device_reset() override; virtual void device_clock_changed() override; // sound stream update overrides virtual void sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) override; private: sound_stream *m_stream = nullptr; // sound states u8 m_regs[16]; u8 m_wave[64]; // 64 entries of wavetable, 6 bit unsigned bool m_vol_env_disable = true; // disable volume envelope bool m_vol_env_mode = false; // volume envelope direction, increase or decrease int m_vol_env_spd = 0; // volume envelope speed/gain u32 m_vol_env_clk = 0; // volume envelope clock counter int m_vol_env_out = 0; // output result of volume envelope bool m_wave_halt = true; // halt wavetable bool m_env_halt = true; // halt envelope int m_wave_freq = 0; // wavetable frequency u32 m_wave_acc = 0; // wavetable accumulator (.16 fixed point) u8 m_wave_addr = 0; // wavetable address counter (.16 fixed point) u8 m_mod_table[32]; // 32 entries of modulator table, 3 bit unsigned bool m_mod_env_disable = true; // disable modulator envelope bool m_mod_env_mode = false; // modulator envelope direction, increase or decrease int m_mod_env_spd = 0; // modulator envelope speed/gain u32 m_mod_env_clk = 0; // modulator envelope clock counter int m_mod_env_out = 0; // output result of modulator envelope bool m_mod_halt = true; // halt modulator int m_mod_freq = 0; // modulator frequency u32 m_mod_acc = 0; // modulator accumulator (.16 fixed point) u8 m_mod_addr = 0; // modulator table address counter (.16 fixed point) int m_mod_pos = 0; // modulator position, 7 bit signed int m_env_spd = 0; // overall envelope speed bool m_wave_write = true; // play sound or write wavetable int m_mvol = 0; // master volume int m_output = 0; // output result int m_mvol_table[4]; // master volume table const int mod_inc[8] = { 0, 1, 2, 4, -4, -4, -2, -1 }; // inlines inline void exec_vol_env(); inline void exec_mod_env(); inline void exec_mod(); inline void exec_wave(); }; // device type definition DECLARE_DEVICE_TYPE(RP2C33_SOUND, rp2c33_sound_device) //************************************************************************** // GLOBAL VARIABLES //************************************************************************** #endif // MAME_MACHINE_RP2C33_SND_H