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https://github.com/ekeeke/Genesis-Plus-GX.git
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78 lines
3.3 KiB
C
78 lines
3.3 KiB
C
/***************************************************************************************
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* Genesis Plus
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* PCM sound chip (315-5476A) (RF5C164 compatible)
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*
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* Copyright (C) 2012 Eke-Eke (Genesis Plus GX)
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*
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* Redistribution and use of this code or any derivative works are permitted
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* provided that the following conditions are met:
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*
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* - Redistributions may not be sold, nor may they be used in a commercial
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* product or activity.
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*
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* - Redistributions that are modified from the original source must include the
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* complete source code, including the source code for all components used by a
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* binary built from the modified sources. However, as a special exception, the
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* source code distributed need not include anything that is normally distributed
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* (in either source or binary form) with the major components (compiler, kernel,
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* and so on) of the operating system on which the executable runs, unless that
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* component itself accompanies the executable.
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*
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* - Redistributions must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other
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* materials provided with the distribution.
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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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************************/
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#ifndef _CD_PCM_
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#define _CD_PCM_
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#include "blip_buf.h"
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/* PCM channel */
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typedef struct
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{
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uint32 addr; /* current Wave RAM address (16.11 fixed point) */
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uint32 st; /* Wave RAM start address (16.11 fixed point) */
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reg16_t ls; /* Wave RAM loop address ($0000-$ffff) */
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reg16_t fd; /* Wave RAM address increment (5.11 fixed point) */
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uint8 env; /* enveloppe multiplier */
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uint8 pan; /* stereo panning */
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} chan_t;
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/* PCM sound chip */
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typedef struct
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{
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chan_t chan[8]; /* PCM channels 1-8 */
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int16 out[2]; /* previous PCM stereo output */
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uint8 *bank; /* external RAM bank pointer */
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uint8 enabled; /* PCM chip ON/OFF status */
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uint8 status; /* channels ON/OFF status */
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uint8 index; /* current channel index */
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uint8 ram[0x10000]; /* 64k external RAM */
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uint32 cycles;
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} pcm_t;
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/* Function prototypes */
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extern void pcm_init(blip_t* left, blip_t* right);
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extern void pcm_reset(void);
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extern int pcm_context_save(uint8 *state);
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extern int pcm_context_load(uint8 *state);
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extern void pcm_update(unsigned int samples);
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extern void pcm_write(unsigned int address, unsigned char data);
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extern unsigned char pcm_read(unsigned int address);
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extern void pcm_ram_dma_w(unsigned int words);
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#endif
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