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#include "synprivate.h"
#include <climits>
#include <cmath>
#include <revolution/types.h>
// #include <revolution/os.h>
// multiplication for negative numbers
#define UpperHalf_(x) ((x) * (1 << 16))
s32 __HBMSYNGetEnvelopeTime(s32 scale, s32 mod, u8 key)
{
// I do not know what these big numbers are for
if (scale == LONG_MIN)
return 0;
if (mod == LONG_MIN)
return powf(2.0f, scale / (1.2e3f * 65536.0f)) * 1e3f;
return powf(2.0f, (mod * __HBMSYNn128[key] + scale) / (1.2e3f * 65535.0f))
* 1e3f;
}
void __HBMSYNSetupVolumeEnvelope(HBMSYNVOICE *voice)
{
ASSERTLINE(38, voice);
if (voice->art->eg1Attack == LONG_MIN)
{
voice->veState = EnvStateDecay;
voice->veAttn = UpperHalf_(0);
if (voice->art->eg1Decay == LONG_MIN)
{
voice->veState = EnvStateSustain;
voice->veAttn = voice->art->eg1Sustain;
}
}
else
{
s32 frames = __HBMSYNGetEnvelopeTime(voice->art->eg1Attack,
voice->art->eg1Vel2Attack,
voice->keyVel) / 3;
if (frames != 0)
{
// I do not know why these numbers are in the upper half
voice->veAttack = UpperHalf_(0);
// I think this line could set some of the lower half, though?
voice->veAttackDelta = UpperHalf_(100) / frames;
voice->veAttn = UpperHalf_(-960);
voice->veState = EnvStateAttack;
}
else
{
voice->veAttack = UpperHalf_(0);
voice->veAttackDelta = UpperHalf_(100);
voice->veAttn = UpperHalf_(-960);
voice->veState = EnvStateAttack;
}
}
// attack or decay
if (voice->veState < EnvStateSustain)
{
s32 frames = __HBMSYNGetEnvelopeTime(voice->art->eg1Decay,
voice->art->eg1Key2Decay,
voice->keyNum) / 3;
if (frames != 0)
voice->veDecay = UpperHalf_(-960) / frames;
else
voice->veDecay = UpperHalf_(-960);
}
voice->veSustain = voice->art->eg1Sustain;
voice->veRelease = voice->art->eg1Release;
}
void __HBMSYNRunVolumeEnvelope(HBMSYNVOICE *voice)
{
ASSERTLINE(101, voice);
switch (voice->veState)
{
case EnvStateAttack:
voice->veAttack += voice->veAttackDelta;
if (voice->veAttack >= UpperHalf_(99))
voice->veAttn = UpperHalf_(0);
else
voice->veAttn = __HBMSYNAttackAttnTable[voice->veAttack >> 16];
if (voice->veAttn == UpperHalf_(0))
voice->veState = EnvStateDecay;
break;
case EnvStateDecay:
voice->veAttn += voice->veDecay;
if (voice->veAttn <= voice->veSustain)
{
voice->veAttn = voice->veSustain;
voice->veState = EnvStateSustain;
}
if (voice->veAttn <= UpperHalf_(-720))
{
voice->veState = EnvStateEnd;
voice->synth->voice[voice->midiChannel][voice->keyNum] = NULL;
}
break;
case EnvStateSustain:
/* TODO: is this handled elsewhere? Or is it just nothing because it's
* a sustain state
*/
break;
case EnvStateRelease:
if (voice->veAttn <= UpperHalf_(-720))
voice->veState = EnvStateEnd;
else
voice->veAttn += voice->veRelease;
break;
}
}
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