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Diffstat (limited to 'src/devices/sound/ym3812.cpp')
-rw-r--r-- | src/devices/sound/ym3812.cpp | 151 |
1 files changed, 0 insertions, 151 deletions
diff --git a/src/devices/sound/ym3812.cpp b/src/devices/sound/ym3812.cpp deleted file mode 100644 index 07da3b73b3b..00000000000 --- a/src/devices/sound/ym3812.cpp +++ /dev/null @@ -1,151 +0,0 @@ -// license:BSD-3-Clause -// copyright-holders:Aaron Giles - -#include "emu.h" -#include "ym3812.h" - - -DEFINE_DEVICE_TYPE(YM3812, ym3812_device, "ym3812", "YM3812 OPL2") - - -//********************************************************* -// YM3812 DEVICE -//********************************************************* - -//------------------------------------------------- -// ym3812_device - constructor -//------------------------------------------------- - -ym3812_device::ym3812_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock, device_type type) : - device_t(mconfig, type, tag, owner, clock), - device_sound_interface(mconfig, *this), - m_address(0), - m_stream(nullptr), - m_fm(*this) -{ -} - - -//------------------------------------------------- -// status_r - return the status port (A0=0) -//------------------------------------------------- - -u8 ym3812_device::status_r() -{ - return m_fm.status() | 0x06; -} - - -//------------------------------------------------- -// read - handle a read from the device -//------------------------------------------------- - -u8 ym3812_device::read(offs_t offset) -{ - // datasheet says status only reads when A0=0 - if ((offset & 1) == 0) - return status_r(); - logerror("Unexpected read from YM3812 offset %d\n", offset & 1); - return 0xff; -} - - -//------------------------------------------------- -// address_w - write to the address port (A0=0) -//------------------------------------------------- - -void ym3812_device::address_w(u8 value) -{ - m_address = value; -} - - -//------------------------------------------------- -// data_w - write to the data port (A0=1) -//------------------------------------------------- - -void ym3812_device::data_w(u8 value) -{ - // force an update - m_stream->update(); - - // write to FM - m_fm.write(m_address, value); -} - - -//------------------------------------------------- -// write - handle a write to the register -// interface -//------------------------------------------------- - -void ym3812_device::write(offs_t offset, u8 value) -{ - // A0 selects between address/data - if ((offset & 1) == 0) - address_w(value); - else - data_w(value); -} - - -//------------------------------------------------- -// device_start - start of emulation -//------------------------------------------------- - -void ym3812_device::device_start() -{ - // create our stream - m_stream = stream_alloc(0, fm_engine::OUTPUTS, m_fm.sample_rate(clock())); - - // save our data - save_item(YMFM_NAME(m_address)); - - // save the engines - m_fm.save(*this); -} - - -//------------------------------------------------- -// device_reset - start of emulation -//------------------------------------------------- - -void ym3812_device::device_reset() -{ - // reset the engines - m_fm.reset(); -} - - -//------------------------------------------------- -// device_clock_changed - update if clock changes -//------------------------------------------------- - -void ym3812_device::device_clock_changed() -{ - m_stream->set_sample_rate(m_fm.sample_rate(clock())); -} - - -//------------------------------------------------- -// sound_stream_update - update the sound stream -//------------------------------------------------- - -void ym3812_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs) -{ - // iterate over all target samples - for (int sampindex = 0; sampindex < outputs[0].samples(); sampindex++) - { - // clock the system - m_fm.clock(fm_engine::ALL_CHANNELS); - - // update the FM content; clipping is unknown - s32 sums[fm_engine::OUTPUTS] = { 0 }; - m_fm.output(sums, 1, 32767, fm_engine::ALL_CHANNELS); - - // convert to 10.3 floating point value for the DAC and back - // YM3812 is mono - for (int index = 0; index < fm_engine::OUTPUTS; index++) - outputs[index].put_int(sampindex, ymfm_roundtrip_fp(sums[index]), 32768); - } -} |