Refactor/subclass Basic_Gb_Apu

Author: tresf

plugins/papu/Basic_Gb_Apu.cpp

@@ -6,10 +6,8 @@ INCLUDE_DIRECTORIES(game-music-emu/gme)
 BUILD_PLUGIN(papu
 	papu_instrument.cpp
 	papu_instrument.h
-	Basic_Gb_Apu.cpp # TODO: Replace with subclass
-	Basic_Gb_Apu.h   # TODO: Replace with subclass
-	# Gb_Apu_Buffer.cpp
-	# Gb_Apu_Buffer.h
+	Gb_Apu_Buffer.cpp
+	Gb_Apu_Buffer.h
 	game-music-emu/gme/Gb_Apu.cpp
 	game-music-emu/gme/Gb_Apu.h
 	game-music-emu/gme/Gb_Oscs.cpp

plugins/papu/Basic_Gb_Apu.h

@@ -0,0 +1,66 @@
+/*
+ * Gb_Apu_Buffer.cpp - Gb_Apu subclass which allows direct buffer access
+ * Copyright (c) 2017 Tres Finocchiaro <tres.finocchiaro/at/gmail.com>
+ * 
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+#include "Gb_Apu.h"
+#include "Gb_Apu_Buffer.h"
+
+blip_time_t const FRAME_LENGTH = 70224;
+long const CLOCK_RATE = 4194304;
+
+Gb_Apu_Buffer::Gb_Apu_Buffer() : m_time(0) {}
+Gb_Apu_Buffer::~Gb_Apu_Buffer() {}
+
+void Gb_Apu_Buffer::write_register(blip_time_t ignore, unsigned addr, int data) {
+	Gb_Apu::write_register(clock(), addr, data);
+}
+
+int Gb_Apu_Buffer::read_register(blip_time_t ignore, unsigned addr) {
+	return Gb_Apu::read_register(clock(), addr);
+}
+
+void Gb_Apu_Buffer::end_frame(blip_time_t ignore) {
+	m_time = 0;
+	Gb_Apu::end_frame(FRAME_LENGTH);
+	m_buf.end_frame(FRAME_LENGTH);
+}
+
+// Sets specified sample rate and hard-coded clock rate in Multi_Buffer
+blargg_err_t Gb_Apu_Buffer::set_sample_rate(long rate) {
+	Gb_Apu_Buffer::output(m_buf.center(), m_buf.left(), m_buf.right());
+	m_buf.clock_rate(CLOCK_RATE);
+	return m_buf.set_sample_rate(rate);
+}
+
+// Wrap Multi_Buffer::samples_avail()
+long Gb_Apu_Buffer::samples_avail() const {
+	return m_buf.samples_avail();
+}
+
+// Wrap Multi_Buffer::read_samples(...)
+long Gb_Apu_Buffer::read_samples(sample_t* out, long count) {
+	return m_buf.read_samples(out, count);
+}
+
+void Gb_Apu_Buffer::bass_freq(int freq) {
+	m_buf.bass_freq(freq);
+}
+

plugins/papu/CMakeLists.txt

@@ -0,0 +1,54 @@
+/*
+ * Gb_Apu_Buffer.cpp - Gb_Apu subclass which allows direct buffer access
+ * Copyright (c) 2017 Tres Finocchiaro <tres.finocchiaro/at/gmail.com>
+ * 
+ * This file is part of LMMS - https://lmms.io
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program (see COPYING); if not, write to the
+ * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef GB_APU_BUFFER_H
+#define GB_APU_BUFFER_H
+
+#include "Gb_Apu.h"
+#include "Multi_Buffer.h"
+#include "MemoryManager.h"
+
+class Gb_Apu_Buffer : public Gb_Apu {
+	MM_OPERATORS
+public:
+	Gb_Apu_Buffer();
+	~Gb_Apu_Buffer();
+
+	void write_register(blip_time_t, unsigned addr, int data);
+	int read_register(blip_time_t, unsigned addr);
+	void end_frame(blip_time_t);
+	blargg_err_t set_sample_rate(long rate);
+	long samples_avail() const;
+	typedef blip_sample_t sample_t;
+	long read_samples(sample_t* out, long count);
+
+	void bass_freq(int freq);
+private:
+	Stereo_Buffer m_buf;
+	blip_time_t m_time;
+
+	// faked CPU timing
+	blip_time_t clock() { return m_time += 4; }
+};
+
+#endif
+