sound.c

#include <stdint.h>

#include "cd.h"
#include "sound.h"
#include "pcmsys.h"

static void sound_external_audio_enable(uint8_t vol_l, uint8_t vol_r)
{
        volatile uint16_t *slot_ptr;

        // Max sound volume is 7
        if (vol_l > 7) {
                vol_l = 7;
        }

        if (vol_r > 7) {
                vol_r = 7;
        }

        // Setup SCSP Slot 16 and Slot 17 for playing
        slot_ptr = (volatile uint16_t *)(0x25B00000 + (0x20 * 16));
        slot_ptr[0] = 0x1000;
        slot_ptr[1] = 0x0000;
        slot_ptr[2] = 0x0000;
        slot_ptr[3] = 0x0000;
        slot_ptr[4] = 0x0000;
        slot_ptr[5] = 0x0000;
        slot_ptr[6] = 0x00FF;
        slot_ptr[7] = 0x0000;
        slot_ptr[8] = 0x0000;
        slot_ptr[9] = 0x0000;
        slot_ptr[10] = 0x0000;
        slot_ptr[11] = 0x001F | (vol_l << 5);
        slot_ptr[12] = 0x0000;
        slot_ptr[13] = 0x0000;
        slot_ptr[14] = 0x0000;
        slot_ptr[15] = 0x0000;

        slot_ptr = (volatile uint16_t *)(0x25B00000 + (0x20 * 17));
        slot_ptr[0] = 0x1000;
        slot_ptr[1] = 0x0000;
        slot_ptr[2] = 0x0000;
        slot_ptr[3] = 0x0000;
        slot_ptr[4] = 0x0000;
        slot_ptr[5] = 0x0000;
        slot_ptr[6] = 0x00FF;
        slot_ptr[7] = 0x0000;
        slot_ptr[8] = 0x0000;
        slot_ptr[9] = 0x0000;
        slot_ptr[10] = 0x0000;
        slot_ptr[11] = 0x000F | (vol_r << 5);
        slot_ptr[12] = 0x0000;
        slot_ptr[13] = 0x0000;
        slot_ptr[14] = 0x0000;
        slot_ptr[15] = 0x0000;

        *((volatile uint16_t *)(0x25B00400)) = 0x020F;
}

// Must be called after cd_init
void
sound_init(void)
{
        sound_external_audio_enable(5, 5);
        pcmsys_load_driver();
        pcmsys_load_8bit_pcm("EXPLOSIO.PCM", 8000);
        pcmsys_load_8bit_pcm("JUMP.PCM", 8000);
        pcmsys_load_8bit_pcm("DASH.PCM", 8000);
}

void
sound_vblank_in(void)
{
        m68k_com->start = 1;
}

void
sound_cdda(int track)
{
        /* CdcPly ply; */
        /* CDC_PLY_STYPE(&ply) = CDC_PTYPE_TNO; //track number */
        /* CDC_PLY_STNO(&ply)  = track; */
        /* CDC_PLY_SIDX(&ply) = 1; */
        /* CDC_PLY_ETYPE(&ply) = CDC_PTYPE_TNO; */
        /* CDC_PLY_ETNO(&ply)  = track + 1; */
        /* CDC_PLY_EIDX(&ply) = 99; */
        /* CDC_PLY_PMODE(&ply) = CDC_PM_DFL | 0xf; //0xf = infinite repetitions */
        /* CDC_CdPlay(&ply); */
}

void
sound_play(short num)
{
        pcm_play(num, PCM_SEMI, 6);
}