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