29ea6dc360
Add sample related enums Add support for backward/pingpong loop, loop end position Structize Notemap in sample instrument
117 lines
2.3 KiB
C++
117 lines
2.3 KiB
C++
/*
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License: BSD-3-Clause
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see https://github.com/cam900/vgsound_emu/LICENSE for more details
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Copyright holder(s): cam900
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Ensoniq ES5504/ES5505/ES5506 Shared Accumulator emulation core
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see es550x.cpp for more info
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*/
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#include "es550x.hpp"
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// Accumulator functions
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void es550x_shared_core::es550x_alu_t::reset()
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{
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m_cr.reset();
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m_fc = 0;
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m_start = 0;
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m_end = 0;
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m_accum = 0;
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m_sample[0] = m_sample[1] = 0;
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}
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bool es550x_shared_core::es550x_alu_t::busy()
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{
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return ((!m_cr.stop0) && (!m_cr.stop1));
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}
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bool es550x_shared_core::es550x_alu_t::tick()
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{
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if (m_cr.dir)
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{
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m_accum = bitfield(m_accum - m_fc, 0, m_total_bits);
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return ((!m_cr.lei) && (m_accum < m_start)) ? true : false;
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}
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else
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{
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m_accum = bitfield(m_accum + m_fc, 0, m_total_bits);
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return ((!m_cr.lei) && (m_accum > m_end)) ? true : false;
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}
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}
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void es550x_shared_core::es550x_alu_t::loop_exec()
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{
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if (m_cr.irqe) // Set IRQ
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m_cr.irq = 1;
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if (m_cr.dir) // Reverse playback
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{
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if (m_cr.lpe) // Loop enable
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{
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if (m_cr.ble) // Bidirectional
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{
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m_cr.dir = 0;
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m_accum = m_start + (m_start - m_accum);
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}
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else// Normal
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m_accum = (m_accum + m_start) - m_end;
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}
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else if (m_cr.ble && m_transwave) // m_transwave
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{
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m_cr.lpe = m_cr.ble = 0;
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m_cr.lei = 1; // Loop end ignore
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m_accum = (m_accum + m_start) - m_end;
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}
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else // Stop
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m_cr.stop0 = 1;
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}
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else
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{
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if (m_cr.lpe) // Loop enable
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{
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if (m_cr.ble) // Bidirectional
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{
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m_cr.dir = 1;
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m_accum = m_end - (m_end - m_accum);
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}
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else // Normal
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m_accum = (m_accum - m_end) + m_start;
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}
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else if (m_cr.ble && m_transwave) // m_transwave
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{
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m_cr.lpe = m_cr.ble = 0;
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m_cr.lei = 1; // Loop end ignore
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m_accum = (m_accum - m_end) + m_start;
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}
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else // Stop
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m_cr.stop0 = 1;
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}
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}
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s32 es550x_shared_core::es550x_alu_t::interpolation()
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{
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// SF = S1 + ACCfr * (S2 - S1)
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return m_sample[0] + ((bitfield(m_accum, std::min<u8>(0, m_fraction - 9), 9) * (m_sample[1] - m_sample[0])) >> 9);
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}
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u32 es550x_shared_core::es550x_alu_t::get_accum_integer()
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{
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return bitfield(m_accum, m_fraction, m_integer);
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}
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void es550x_shared_core::es550x_alu_t::irq_exec(es550x_intf &intf, es550x_irq_t &irqv, u8 index)
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{
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const u8 prev = irqv.irqb;
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if (m_cr.irq)
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{
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if (irqv.irqb)
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{
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irqv.set(index);
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m_cr.irq = 0;
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}
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}
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if (prev != irqv.irqb)
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irq_update(intf, irqv);
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}
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