125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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============================================================================
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MODIFIED Namco C140/C219 sound emulator - MODIFIED VERSION
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by cam900
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MODIFICATION by tildearrow - adds muting function AND VGM banking
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THIS IS NOT THE ORIGINAL VERSION - you can find the original one in
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commit 72d04777c013988ed8cf6da27c62a9d784a59dff
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This file is licensed under zlib license.
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============================================================================
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zlib License
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(C) 2023-present cam900 and contributors
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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============================================================================
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TODO:
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- unknown registers (Bit 6 of control register, etc)
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- Internal timer
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*/
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#ifndef _C140_C219_EMU_H
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#define _C140_C219_EMU_H
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#include <stdbool.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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struct c140_voice_t
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{
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bool muted; // muted - can be set by user
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bool busy; // busy flag
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bool keyon; // key on flag
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unsigned short freq; // sample frequency
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unsigned char bank; // sample bank
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unsigned int start_addr; // sample start address
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unsigned int loop_addr; // sample loop address
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unsigned int end_addr; // sample end address
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int lvol, rvol; // left/right volume
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bool noise; // noise flag
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bool inv_lout; // invert left output flag
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bool inv_sign; // invert sign bit flag
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bool compressed; // compressed sample flag
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bool loop; // loop flag
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unsigned int addr; // sample address
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int frac; // frequency counter (.16 fixed point)
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int lout, rout; // left/right output
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};
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struct c140_t
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{
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struct c140_voice_t voice[24];
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signed int lout, rout;
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signed short mulaw[256];
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signed short *sample_mem;
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unsigned char bank_type;
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};
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struct c219_t
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{
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struct c140_voice_t voice[16];
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signed int lout, rout;
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signed short mulaw[256];
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unsigned short lfsr;
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unsigned char bank[4];
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signed char *sample_mem;
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};
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void c140_tick(struct c140_t *c140, const int cycle);
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void c219_tick(struct c219_t *c219, const int cycle);
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void c140_voice_tick(struct c140_t *c140, const unsigned char v, const int cycle);
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void c219_voice_tick(struct c219_t *c219, const unsigned char v, const int cycle);
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void c140_keyon(struct c140_voice_t *c140_voice);
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void c219_keyon(struct c140_voice_t *c140_voice);
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void c140_write(struct c140_t *c140, const unsigned short addr, const unsigned char data);
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void c219_write(struct c219_t *c219, const unsigned short addr, const unsigned char data);
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void c140_bank_type(struct c140_t *c140, unsigned char type);
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void c140_init(struct c140_t *c140);
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void c219_init(struct c219_t *c219);
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void c140_reset(struct c140_t *c140);
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void c219_reset(struct c219_t *c219);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif // _C140_C219_EMU_H
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