From 8a0a939a3281a31fc17327d24f0a4c0975a1b9fa Mon Sep 17 00:00:00 2001
From: Vitaly Novichkov <admin@wohlnet.ru>
Date: Tue, 10 Apr 2018 02:15:03 +0300
Subject: [Experimental] Added support for emulation core switching in real
 time! Due to clunky playback on updated Nuked OPL3 emulator v 1.8, I kept the
 Nuked OPL3 1.7.4 work in parallel and be a separated switchable emulator.

---
 src/chips/dosbox_opl3.cpp | 84 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 src/chips/dosbox_opl3.cpp

(limited to 'src/chips/dosbox_opl3.cpp')

diff --git a/src/chips/dosbox_opl3.cpp b/src/chips/dosbox_opl3.cpp
new file mode 100644
index 0000000..b696343
--- /dev/null
+++ b/src/chips/dosbox_opl3.cpp
@@ -0,0 +1,84 @@
+#include "dosbox_opl3.h"
+#include "dosbox/dbopl.h"
+#include <cstdlib>
+#include <assert.h>
+
+DosBoxOPL3::DosBoxOPL3() :
+    OPLChipBase(),
+    m_chip(nullptr)
+{
+    reset();
+}
+
+DosBoxOPL3::DosBoxOPL3(const DosBoxOPL3 &c) :
+    OPLChipBase(c),
+    m_chip(nullptr)
+{
+    setRate(c.m_rate);
+}
+
+DosBoxOPL3::~DosBoxOPL3()
+{
+    DBOPL::Handler *chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    delete chip_r;
+}
+
+void DosBoxOPL3::setRate(uint32_t rate)
+{
+    OPLChipBase::setRate(rate);
+    reset();
+}
+
+void DosBoxOPL3::reset()
+{
+    DBOPL::Handler *chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    if(m_chip && chip_r)
+        delete chip_r;
+    m_chip = new DBOPL::Handler;
+    chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    chip_r->Init(m_rate);
+}
+
+void DosBoxOPL3::reset(uint32_t rate)
+{
+    setRate(rate);
+}
+
+void DosBoxOPL3::writeReg(uint16_t addr, uint8_t data)
+{
+    DBOPL::Handler *chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    chip_r->WriteReg(static_cast<Bit32u>(addr), data);
+}
+
+int DosBoxOPL3::generate(int16_t *output, size_t frames)
+{
+    DBOPL::Handler *chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    ssize_t left = (ssize_t)frames;
+    while(left > 0)
+    {
+        ssize_t frames_i = left;
+        chip_r->GenerateArr(output, &frames_i);
+        output += (frames_i * 2);
+        left -= frames_i;
+    }
+    return (int)frames;
+}
+
+int DosBoxOPL3::generateAndMix(int16_t *output, size_t frames)
+{
+    DBOPL::Handler *chip_r = reinterpret_cast<DBOPL::Handler*>(m_chip);
+    ssize_t left = (ssize_t)frames;
+    while(left > 0)
+    {
+        ssize_t frames_i = left;
+        chip_r->GenerateArrMix(output, &frames_i);
+        output += (frames_i * 2);
+        left -= frames_i;
+    }
+    return (int)frames;
+}
+
+const char *DosBoxOPL3::emulatorName()
+{
+    return "DosBox 0.74 OPL3";
+}
-- 
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