// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Midi synth routines for the Emu8k/Emu10k1
 *
 *  Copyright (C) 1999 Steve Ratcliffe
 *  Copyright (c) 1999-2000 Takashi Iwai <tiwai@suse.de>
 *
 *  Contains code based on awe_wave.c by Takashi Iwai
 */

#include "emux_voice.h"
#include <linux/slab.h>

#ifdef SNDRV_EMUX_USE_RAW_EFFECT
/*
 * effects table
 */

#define xoffsetof(type,tag)     ((long)(&((type)NULL)->tag) - (long)(NULL))

#define parm_offset(tag)        xoffsetof(struct soundfont_voice_parm *, tag)

#define PARM_IS_BYTE            (1 << 0)
#define PARM_IS_WORD            (1 << 1)
#define PARM_IS_ALIGNED         (3 << 2)
#define PARM_IS_ALIGN_HI        (1 << 2)
#define PARM_IS_ALIGN_LO        (2 << 2)
#define PARM_IS_SIGNED          (1 << 4)

#define PARM_WORD       (PARM_IS_WORD)
#define PARM_BYTE_LO    (PARM_IS_BYTE|PARM_IS_ALIGN_LO)
#define PARM_BYTE_HI    (PARM_IS_BYTE|PARM_IS_ALIGN_HI)
#define PARM_BYTE       (PARM_IS_BYTE)
#define PARM_SIGN_LO    (PARM_IS_BYTE|PARM_IS_ALIGN_LO|PARM_IS_SIGNED)
#define PARM_SIGN_HI    (PARM_IS_BYTE|PARM_IS_ALIGN_HI|PARM_IS_SIGNED)

static struct emux_parm_defs {
        int type;       /* byte or word */
        int low, high;  /* value range */
        long offset;    /* offset in parameter record (-1 = not written) */
        int update;     /* flgas for real-time update */
} parm_defs[EMUX_NUM_EFFECTS] = {
        {PARM_WORD, 0, 0x8000, parm_offset(moddelay), 0},       /* env1 delay */
        {PARM_BYTE_LO, 1, 0x80, parm_offset(modatkhld), 0},     /* env1 attack */
        {PARM_BYTE_HI, 0, 0x7e, parm_offset(modatkhld), 0},     /* env1 hold */
        {PARM_BYTE_LO, 1, 0x7f, parm_offset(moddcysus), 0},     /* env1 decay */
        {PARM_BYTE_LO, 1, 0x7f, parm_offset(modrelease), 0},    /* env1 release */
        {PARM_BYTE_HI, 0, 0x7f, parm_offset(moddcysus), 0},     /* env1 sustain */
        {PARM_BYTE_HI, 0, 0xff, parm_offset(pefe), 0},  /* env1 pitch */
        {PARM_BYTE_LO, 0, 0xff, parm_offset(pefe), 0},  /* env1 fc */

        {PARM_WORD, 0, 0x8000, parm_offset(voldelay), 0},       /* env2 delay */
        {PARM_BYTE_LO, 1, 0x80, parm_offset(volatkhld), 0},     /* env2 attack */
        {PARM_BYTE_HI, 0, 0x7e, parm_offset(volatkhld), 0},     /* env2 hold */
        {PARM_BYTE_LO, 1, 0x7f, parm_offset(voldcysus), 0},     /* env2 decay */
        {PARM_BYTE_LO, 1, 0x7f, parm_offset(volrelease), 0},    /* env2 release */
        {PARM_BYTE_HI, 0, 0x7f, parm_offset(voldcysus), 0},     /* env2 sustain */

        {PARM_WORD, 0, 0x8000, parm_offset(lfo1delay), 0},      /* lfo1 delay */
        {PARM_BYTE_LO, 0, 0xff, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},      /* lfo1 freq */
        {PARM_SIGN_HI, -128, 127, parm_offset(tremfrq), SNDRV_EMUX_UPDATE_TREMFREQ},    /* lfo1 vol */
        {PARM_SIGN_HI, -128, 127, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD}, /* lfo1 pitch */
        {PARM_BYTE_LO, 0, 0xff, parm_offset(fmmod), SNDRV_EMUX_UPDATE_FMMOD},   /* lfo1 cutoff */

        {PARM_WORD, 0, 0x8000, parm_offset(lfo2delay), 0},      /* lfo2 delay */
        {PARM_BYTE_LO, 0, 0xff, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2},       /* lfo2 freq */
        {PARM_SIGN_HI, -128, 127, parm_offset(fm2frq2), SNDRV_EMUX_UPDATE_FM2FRQ2},     /* lfo2 pitch */

        {PARM_WORD, 0, 0xffff, -1, SNDRV_EMUX_UPDATE_PITCH},    /* initial pitch */
        {PARM_BYTE, 0, 0xff, parm_offset(chorus), 0},   /* chorus */
        {PARM_BYTE, 0, 0xff, parm_offset(reverb), 0},   /* reverb */
        {PARM_BYTE, 0, 0xff, parm_offset(cutoff), SNDRV_EMUX_UPDATE_VOLUME},    /* cutoff */
        {PARM_BYTE, 0, 15, parm_offset(filterQ), SNDRV_EMUX_UPDATE_Q},  /* resonance */

        {PARM_WORD, 0, 0xffff, -1, 0},  /* sample start */
        {PARM_WORD, 0, 0xffff, -1, 0},  /* loop start */
        {PARM_WORD, 0, 0xffff, -1, 0},  /* loop end */
        {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse sample start */
        {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse loop start */
        {PARM_WORD, 0, 0xffff, -1, 0},  /* coarse loop end */
        {PARM_BYTE, 0, 0xff, -1, SNDRV_EMUX_UPDATE_VOLUME},     /* initial attenuation */
};

/* set byte effect value */
static void
effect_set_byte(unsigned char *valp, struct snd_midi_channel *chan, int type)
{
        short effect;
        struct snd_emux_effect_table *fx = chan->private;

        effect = fx->val[type];
        if (fx->flag[type] == EMUX_FX_FLAG_ADD) {
                if (parm_defs[type].type & PARM_IS_SIGNED)
                        effect += *(char*)valp;
                else
                        effect += *valp;
        }
        if (effect < parm_defs[type].low)
                effect = parm_defs[type].low;
        else if (effect > parm_defs[type].high)
                effect = parm_defs[type].high;
        *valp = (unsigned char)effect;
}

/* set word effect value */
static void
effect_set_word(unsigned short *valp, struct snd_midi_channel *chan, int type)
{
        int effect;
        struct snd_emux_effect_table *fx = chan->private;

        effect = *(unsigned short*)&fx->val[type];
        if (fx->flag[type] == EMUX_FX_FLAG_ADD)
                effect += *valp;
        if (effect < parm_defs[type].low)
                effect = parm_defs[type].low;
        else if (effect > parm_defs[type].high)
                effect = parm_defs[type].high;
        *valp = (unsigned short)effect;
}

/* address offset */
static int
effect_get_offset(struct snd_midi_channel *chan, int lo, int hi, int mode)
{
        int addr = 0;
        struct snd_emux_effect_table *fx = chan->private;

        if (fx->flag[hi])
                addr = (short)fx->val[hi];
        addr = addr << 15;
        if (fx->flag[lo])
                addr += (short)fx->val[lo];
        if (!(mode & SNDRV_SFNT_SAMPLE_8BITS))
                addr /= 2;
        return addr;
}

#if IS_ENABLED(CONFIG_SND_SEQUENCER_OSS)
/* change effects - for OSS sequencer compatibility */
void
snd_emux_send_effect_oss(struct snd_emux_port *port,
                         struct snd_midi_channel *chan, int type, int val)
{
        int mode;

        if (type & 0x40)
                mode = EMUX_FX_FLAG_OFF;
        else if (type & 0x80)
                mode = EMUX_FX_FLAG_ADD;
        else
                mode = EMUX_FX_FLAG_SET;
        type &= 0x3f;

        snd_emux_send_effect(port, chan, type, val, mode);
}
#endif

/* Modify the effect value.
 * if update is necessary, call emu8000_control
 */
void
snd_emux_send_effect(struct snd_emux_port *port, struct snd_midi_channel *chan,
                     int type, int val, int mode)
{
        int i;
        int offset;
        unsigned char *srcp, *origp;
        struct snd_emux *emu;
        struct snd_emux_effect_table *fx;

        emu = port->emu;
        fx = chan->private;
        if (emu == NULL || fx == NULL)
                return;
        if (type < 0 || type >= EMUX_NUM_EFFECTS)
                return;

        fx->val[type] = val;
        fx->flag[type] = mode;

        /* do we need to modify the register in realtime ? */
        if (!parm_defs[type].update)
                return;
        offset = parm_defs[type].offset;
        if (offset < 0)
                return;

#ifdef SNDRV_LITTLE_ENDIAN
        if (parm_defs[type].type & PARM_IS_ALIGN_HI)
                offset++;
#else
        if (parm_defs[type].type & PARM_IS_ALIGN_LO)
                offset++;
#endif
        /* modify the register values */
        scoped_guard(spinlock_irqsave, &emu->voice_lock) {
                for (i = 0; i < emu->max_voices; i++) {
                        struct snd_emux_voice *vp = &emu->voices[i];
                        if (!STATE_IS_PLAYING(vp->state) || vp->chan != chan)
                                continue;
                        srcp = (unsigned char *)&vp->reg.parm + offset;
                        origp = (unsigned char *)&vp->zone->v.parm + offset;
                        if (parm_defs[i].type & PARM_IS_BYTE) {
                                *srcp = *origp;
                                effect_set_byte(srcp, chan, type);
                        } else {
                                *(unsigned short *)srcp = *(unsigned short *)origp;
                                effect_set_word((unsigned short *)srcp, chan, type);
                        }
                }
        }

        /* activate them */
        snd_emux_update_channel(port, chan, parm_defs[type].update);
}


/* copy wavetable registers to voice table */
void
snd_emux_setup_effect(struct snd_emux_voice *vp)
{
        struct snd_midi_channel *chan = vp->chan;
        struct snd_emux_effect_table *fx;
        unsigned char *srcp;
        int i;

        fx = chan->private;
        if (!fx)
                return;

        /* modify the register values via effect table */
        for (i = 0; i < EMUX_FX_END; i++) {
                int offset;
                if (!fx->flag[i])
                        continue;
                offset = parm_defs[i].offset;
                if (offset < 0)
                        continue;
#ifdef SNDRV_LITTLE_ENDIAN
                if (parm_defs[i].type & PARM_IS_ALIGN_HI)
                        offset++;
#else
                if (parm_defs[i].type & PARM_IS_ALIGN_LO)
                        offset++;
#endif
                srcp = (unsigned char*)&vp->reg.parm + offset;
                if (parm_defs[i].type & PARM_IS_BYTE)
                        effect_set_byte(srcp, chan, i);
                else
                        effect_set_word((unsigned short*)srcp, chan, i);
        }

        /* correct sample and loop points */
        vp->reg.start += effect_get_offset(chan, EMUX_FX_SAMPLE_START,
                                           EMUX_FX_COARSE_SAMPLE_START,
                                           vp->reg.sample_mode);

        vp->reg.loopstart += effect_get_offset(chan, EMUX_FX_LOOP_START,
                                               EMUX_FX_COARSE_LOOP_START,
                                               vp->reg.sample_mode);

        vp->reg.loopend += effect_get_offset(chan, EMUX_FX_LOOP_END,
                                             EMUX_FX_COARSE_LOOP_END,
                                             vp->reg.sample_mode);
}

/*
 * effect table
 */
void
snd_emux_create_effect(struct snd_emux_port *p)
{
        int i;
        p->effect = kzalloc_objs(struct snd_emux_effect_table,
                                 p->chset.max_channels);
        if (p->effect) {
                for (i = 0; i < p->chset.max_channels; i++)
                        p->chset.channels[i].private = p->effect + i;
        } else {
                for (i = 0; i < p->chset.max_channels; i++)
                        p->chset.channels[i].private = NULL;
        }
}

void
snd_emux_delete_effect(struct snd_emux_port *p)
{
        kfree(p->effect);
        p->effect = NULL;
}

void
snd_emux_clear_effect(struct snd_emux_port *p)
{
        if (p->effect) {
                memset(p->effect, 0, sizeof(struct snd_emux_effect_table) *
                       p->chset.max_channels);
        }
}

#endif /* SNDRV_EMUX_USE_RAW_EFFECT */