// license:BSD-3-Clause // copyright-holders:Angelo Salese /*************************************************************************** Flower custom sound chip Similar to Wiping and Namco 15xx designs TODO: - several unknown registers (effects and unknown register tied to repeat port); - repeat certainly needs a cutoff, which is unknown about how it works; ***************************************************************************/ #include "emu.h" #include "flower.h" //************************************************************************** // GLOBAL VARIABLES //************************************************************************** // device type definition DEFINE_DEVICE_TYPE(FLOWER_CUSTOM, flower_sound_device, "flower_sound", "Flower Custom Sound") // TODO: select() unsupported by DEVICE_ADDRESS_MAP, so we need a trampoline here void flower_sound_device::regs_map(address_map &map) { map(0x00, 0x03).select(0x38).w(FUNC(flower_sound_device::frequency_w)); map(0x04, 0x04).select(0x38).w(FUNC(flower_sound_device::repeat_w)); map(0x05, 0x05).select(0x38).w(FUNC(flower_sound_device::unk_w)); map(0x07, 0x07).select(0x38).w(FUNC(flower_sound_device::volume_w)); map(0x40, 0x45).select(0x38).w(FUNC(flower_sound_device::start_address_w)); map(0x47, 0x47).select(0x38).w(FUNC(flower_sound_device::sample_trigger_w)); } //************************************************************************** // LIVE DEVICE //************************************************************************** //------------------------------------------------- // flower_sound_device - constructor //------------------------------------------------- flower_sound_device::flower_sound_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) : device_t(mconfig, FLOWER_CUSTOM, tag, owner, clock), device_sound_interface(mconfig, *this), device_memory_interface(mconfig, *this), m_io_space_config("io", ENDIANNESS_LITTLE, 8, 7, 0, address_map_constructor(FUNC(flower_sound_device::regs_map), this)), m_stream(nullptr), m_mixer_lookup(nullptr), m_last_channel(nullptr) { } //------------------------------------------------- // device_start - device-specific startup //------------------------------------------------- void flower_sound_device::device_start() { m_iospace = &space(AS_IO); m_stream = stream_alloc(0, 1, clock()/2); m_mixer_buffer.resize(clock()/50); make_mixer_table(MAX_VOICES, defgain); m_last_channel = m_channel_list + MAX_VOICES; m_sample_rom = machine().root_device().memregion("samples")->base(); m_volume_rom = machine().root_device().memregion("soundvol")->base(); for (int i = 0; i < MAX_VOICES; i++) { save_item(NAME(m_channel_list[i].start_address), i); save_item(NAME(m_channel_list[i].position), i); save_item(NAME(m_channel_list[i].frequency), i); save_item(NAME(m_channel_list[i].volume), i); save_item(NAME(m_channel_list[i].volume_bank), i); save_item(NAME(m_channel_list[i].effect), i); save_item(NAME(m_channel_list[i].enable), i); save_item(NAME(m_channel_list[i].repeat), i); // assign a channel number (debugger aid) m_channel_list[i].channel_number = i; } } /* build a table to divide by the number of voices; gain is specified as gain*16 */ void flower_sound_device::make_mixer_table(int voices, int gain) { /* allocate memory */ m_mixer_table.resize(256 * voices); /* find the middle of the table */ m_mixer_lookup = &m_mixer_table[128 * voices]; /* fill in the table - 16 bit case */ for (int i = 0; i < voices * 128; i++) { int val = i * gain * 16 / voices; if (val > 32767) val = 32767; m_mixer_lookup[ i] = val; m_mixer_lookup[-i] = -val; } } //------------------------------------------------- // device_reset - device-specific reset //------------------------------------------------- void flower_sound_device::device_reset() { for (fl_sound_channel *voice = m_channel_list; voice < m_last_channel; voice++) { voice->start_address = 0; voice->position = 0; voice->volume = 0; voice->enable = false; voice->repeat = false; } } void flower_sound_device::sound_stream_update(sound_stream &stream, std::vector const &inputs, std::vector &outputs) { auto &buffer = outputs[0]; short *mix; uint8_t raw_sample; std::fill_n(&m_mixer_buffer[0], buffer.samples(), 0); for (fl_sound_channel *voice = m_channel_list; voice < m_last_channel; voice++) { int ch_volume = voice->volume; int ch_frequency = voice->frequency; if (voice->enable == false) continue; mix = &m_mixer_buffer[0]; for (int i = 0; i < buffer.samples(); i++) { if (voice->repeat == true) { raw_sample = m_sample_rom[((voice->start_address >> 7) & 0x7e00) | ((voice->position >> 7) & 0x1ff)]; // guess: cut off after a number of repetitions if ((voice->position >> 7) & 0x20000) { voice->enable = false; break; } } else { raw_sample = m_sample_rom[((voice->start_address + voice->position) >> 7) & 0x7fff]; if (raw_sample == 0xff) { voice->enable = false; break; } } ch_volume |= voice->volume_bank; *mix++ += m_volume_rom[(ch_volume << 8 | raw_sample) & 0x3fff] - 0x80; voice->position += ch_frequency; } } /* mix it down */ mix = &m_mixer_buffer[0]; for (int i = 0; i < buffer.samples(); i++) buffer.put_int(i, m_mixer_lookup[*mix++], 32768); } //------------------------------------------------- // memory_space_config - return a description of // any address spaces owned by this device //------------------------------------------------- device_memory_interface::space_config_vector flower_sound_device::memory_space_config() const { return space_config_vector { std::make_pair(AS_IO, &m_io_space_config) }; } //************************************************************************** // READ/WRITE HANDLERS //************************************************************************** void flower_sound_device::lower_write(offs_t offset, uint8_t data) { m_stream->update(); m_iospace->write_byte(offset,data); } void flower_sound_device::upper_write(offs_t offset, uint8_t data) { m_stream->update(); m_iospace->write_byte(offset|0x40,data); } void flower_sound_device::frequency_w(offs_t offset, uint8_t data) { uint8_t ch = (offset >> 3) & 0x7; fl_sound_channel *voice; voice = &m_channel_list[ch]; voice->raw_frequency[offset & 3] = data & 0xf; voice->frequency = voice->raw_frequency[2] << 12; voice->frequency|= voice->raw_frequency[3] << 8; voice->frequency|= voice->raw_frequency[0] << 4; voice->frequency|= voice->raw_frequency[1] << 0; } void flower_sound_device::repeat_w(offs_t offset, uint8_t data) { uint8_t ch = (offset >> 3) & 0x7; fl_sound_channel *voice; voice = &m_channel_list[ch]; voice->repeat = BIT(data,4); } void flower_sound_device::unk_w(offs_t offset, uint8_t data) { // same as above? } void flower_sound_device::volume_w(offs_t offset, uint8_t data) { uint8_t ch = (offset >> 3) & 0x7; fl_sound_channel *voice; voice = &m_channel_list[ch]; voice->volume = data >> 4; } void flower_sound_device::start_address_w(offs_t offset, uint8_t data) { uint8_t ch = (offset >> 3) & 0x7; fl_sound_channel *voice; voice = &m_channel_list[ch]; voice->start_nibbles[offset & 7] = data & 0xf; if ((offset & 7) == 4) voice->effect = data >> 4; } void flower_sound_device::sample_trigger_w(offs_t offset, uint8_t data) { uint8_t ch = (offset >> 3) & 0x7; fl_sound_channel *voice; voice = &m_channel_list[ch]; voice->enable = true; voice->volume_bank = (data & 3) << 4; voice->start_address = 0; voice->position = 0; for (int i = 5; i >= 0; i--) { voice->start_address = (voice->start_address << 4) | voice->start_nibbles[i]; } }