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+// BSD 3-Clause License
+//
+// Copyright (c) 2021, Aaron Giles
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this
+// list of conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice,
+// this list of conditions and the following disclaimer in the documentation
+// and/or other materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef YMFM_MISC_H
+#define YMFM_MISC_H
+
+#pragma once
+
+#include "ymfm.h"
+#include "ymfm_adpcm.h"
+#include "ymfm_ssg.h"
+
+namespace ymfm
+{
+
+//*********************************************************
+// SSG IMPLEMENTATION CLASSES
+//*********************************************************
+
+// ======================> ym2149
+
+// ym2149 is just an SSG with no FM part, but we expose FM-like parts so that it
+// integrates smoothly with everything else; they just don't do anything
+class ym2149
+{
+public:
+ static constexpr uint32_t OUTPUTS = ssg_engine::OUTPUTS;
+ static constexpr uint32_t SSG_OUTPUTS = ssg_engine::OUTPUTS;
+ using output_data = ymfm_output<OUTPUTS>;
+
+ // constructor
+ ym2149(ymfm_interface &intf);
+
+ // configuration
+ void ssg_override(ssg_override &intf) { m_ssg.override(intf); }
+
+ // reset
+ void reset();
+
+ // save/restore
+ void save_restore(ymfm_saved_state &state);
+
+ // pass-through helpers
+ uint32_t sample_rate(uint32_t input_clock) const { return input_clock / ssg_engine::CLOCK_DIVIDER / 8; }
+
+ // read access
+ uint8_t read_data();
+ uint8_t read(uint32_t offset);
+
+ // write access
+ void write_address(uint8_t data);
+ void write_data(uint8_t data);
+ void write(uint32_t offset, uint8_t data);
+
+ // generate one sample of sound
+ void generate(output_data *output, uint32_t numsamples = 1);
+
+protected:
+ // internal state
+ uint8_t m_address; // address register
+ ssg_engine m_ssg; // SSG engine
+};
+
+}
+
+
+#endif // YMFM_MISC_H