168 lines
4.4 KiB
C
168 lines
4.4 KiB
C
#include <stdint.h>
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#include <stdlib.h>
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#include "ibm.h"
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#include "io.h"
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#include "sound.h"
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#include "sound_opl.h"
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#include "sound_dbopl.h"
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#include "x86.h"
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/*Interfaces between PCem and the actual OPL emulator*/
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uint8_t opl2_read(uint16_t a, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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cycles -= (int)(isa_timing * 8);
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opl2_update2(opl);
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return opl_read(0, a);
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}
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void opl2_write(uint16_t a, uint8_t v, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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opl2_update2(opl);
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opl_write(0, a, v);
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opl_write(1, a, v);
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}
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uint8_t opl2_l_read(uint16_t a, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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cycles -= (int)(isa_timing * 8);
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opl2_update2(opl);
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return opl_read(0, a);
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}
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void opl2_l_write(uint16_t a, uint8_t v, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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opl2_update2(opl);
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opl_write(0, a, v);
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}
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uint8_t opl2_r_read(uint16_t a, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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cycles -= (int)(isa_timing * 8);
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opl2_update2(opl);
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return opl_read(1, a);
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}
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void opl2_r_write(uint16_t a, uint8_t v, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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opl2_update2(opl);
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opl_write(1, a, v);
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}
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uint8_t opl3_read(uint16_t a, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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cycles -= (int)(isa_timing * 8);
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opl3_update2(opl);
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return opl_read(0, a);
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}
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void opl3_write(uint16_t a, uint8_t v, void *priv)
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{
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opl_t *opl = (opl_t *)priv;
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opl3_update2(opl);
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opl_write(0, a, v);
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}
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void opl2_update2(opl_t *opl)
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{
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if (opl->pos < sound_pos_global)
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{
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opl2_update(0, &opl->buffer[opl->pos*2], sound_pos_global - opl->pos);
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opl2_update(1, &opl->buffer[opl->pos*2 + 1], sound_pos_global - opl->pos);
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for (; opl->pos < sound_pos_global; opl->pos++)
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{
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opl->filtbuf[0] = opl->buffer[opl->pos*2] = (opl->buffer[opl->pos*2] / 2);
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opl->filtbuf[1] = opl->buffer[opl->pos*2+1] = (opl->buffer[opl->pos*2+1] / 2);
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}
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}
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}
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void opl3_update2(opl_t *opl)
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{
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if (opl->pos < sound_pos_global)
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{
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opl3_update(0, &opl->buffer[opl->pos*2], sound_pos_global - opl->pos);
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for (; opl->pos < sound_pos_global; opl->pos++)
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{
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opl->filtbuf[0] = opl->buffer[opl->pos*2] = (opl->buffer[opl->pos*2] / 2);
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opl->filtbuf[1] = opl->buffer[opl->pos*2+1] = (opl->buffer[opl->pos*2+1] / 2);
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}
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}
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}
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void ym3812_timer_set_0(void *param, int timer, int64_t period)
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{
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opl_t *opl = (opl_t *)param;
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if (period)
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timer_set_delay_u64(&opl->timers[0][timer], period * TIMER_USEC * 20);
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else
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timer_disable(&opl->timers[0][timer]);
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}
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void ym3812_timer_set_1(void *param, int timer, int64_t period)
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{
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opl_t *opl = (opl_t *)param;
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if (period)
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timer_set_delay_u64(&opl->timers[1][timer], period * TIMER_USEC * 20);
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else
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timer_disable(&opl->timers[1][timer]);
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}
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void ymf262_timer_set(void *param, int timer, int64_t period)
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{
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opl_t *opl = (opl_t *)param;
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if (period)
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timer_set_delay_u64(&opl->timers[0][timer], period * TIMER_USEC * 20);
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else
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timer_disable(&opl->timers[0][timer]);
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}
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static void opl_timer_callback00(void *p)
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{
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opl_timer_over(0, 0);
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}
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static void opl_timer_callback01(void *p)
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{
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opl_timer_over(0, 1);
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}
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static void opl_timer_callback10(void *p)
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{
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opl_timer_over(1, 0);
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}
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static void opl_timer_callback11(void *p)
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{
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opl_timer_over(1, 1);
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}
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void opl2_init(opl_t *opl)
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{
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opl_init(ym3812_timer_set_0, opl, 0, 0, 0);
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opl_init(ym3812_timer_set_1, opl, 1, 0, 0);
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timer_add(&opl->timers[0][0], opl_timer_callback00, (void *)opl, 0);
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timer_add(&opl->timers[0][1], opl_timer_callback01, (void *)opl, 0);
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timer_add(&opl->timers[1][0], opl_timer_callback10, (void *)opl, 0);
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timer_add(&opl->timers[1][1], opl_timer_callback11, (void *)opl, 0);
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}
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void opl3_init(opl_t *opl, int opl_emu)
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{
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opl_init(ymf262_timer_set, opl, 0, 1, opl_emu);
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timer_add(&opl->timers[0][0], opl_timer_callback00, (void *)opl, 0);
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timer_add(&opl->timers[0][1], opl_timer_callback01, (void *)opl, 0);
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}
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