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melonDS
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hey look Arisotura added shitty code. 

proof-of-concept interpolation
This commit is contained in:
Arisotura 2021-07-22 22:08:42 +02:00
parent 438788a990
commit ae24d6b36e
1 changed files with 14 additions and 0 deletions
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14
src/SPU.cpp
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@ -445,6 +445,8 @@ s32 Channel::Run()
{
Timer = TimerReload + (Timer - 0x10000);
PrevSample = CurSample;
switch (type)
{
case 0: NextSample_PCM8(); break;
@ -456,6 +458,18 @@ s32 Channel::Run()
}
s32 val = (s32)CurSample;
// interpolation
// now you get to enjoy Electric Angel in high quality I guess.
// TODO MAKE CONDITIONAL!!!
if (true)
{
s32 samplepos = ((Timer - TimerReload) * 0x1000) / (0x10000 - TimerReload);
//printf("CHANNEL %d POS=%d SAMPLEPOS=%08X (%04X/%04X)\n", Num, Pos, samplepos, Timer, TimerReload);
val = ((val * samplepos) + (PrevSample * (0x1000-samplepos))) >> 12;
//printf("ASSDERP = %08X/%08X => %08X\n", CurSample, PrevSample, val);
}
val <<= VolumeShift;
val *= Volume;
return val;