otomatalabs/furnace
8
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

optimize putSample a bit

Browse source 
use 16-bit precision even on 64-bit....
this allows some code optimizations
This commit is contained in:
tildearrow 2025-03-03 00:51:47 -05:00
parent 2926fad77e
commit cf4807b5d0
2 changed files with 15 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

31
src/engine/dispatch.h
View file

@ -424,15 +424,14 @@ struct DivSamplePos {
freq(0) {}
};
constexpr size_t OSCBUF_PREC=(sizeof(size_t)>=8)?32:16;
constexpr size_t OSCBUF_PREC=(sizeof(size_t)>=8)?16:16;
constexpr size_t OSCBUF_MASK=(UINTMAX_C(1)<<OSCBUF_PREC)-1;
// the actual output of all DivDispatchOscBuffer instanced runs at 65536Hz.
struct DivDispatchOscBuffer {
size_t rate;
size_t rateMul;
unsigned int needleSub;
unsigned short needle;
unsigned int needle;
unsigned short readNeedle;
unsigned short followNeedle;
unsigned short lastSample;
@ -440,18 +439,18 @@ struct DivDispatchOscBuffer {
short data[65536];
inline void putSample(size_t pos, short val) {
unsigned short realPos=needle+((needleSub+pos*rateMul)>>OSCBUF_PREC);
unsigned short realPos=((needle+pos*rateMul)>>OSCBUF_PREC);
if (val==-1) {
data[realPos]=0xfffe;
return;
}
lastSample=val;
//lastSample=val;
data[realPos]=val;
}
inline void begin(unsigned short len) {
size_t calc=(needleSub+len*rateMul)>>OSCBUF_PREC;
unsigned short start=needle;
unsigned short end=needle+calc;
size_t calc=(len*rateMul);
unsigned short start=needle>>16;
unsigned short end=(needle+calc)>>16;
//logD("C %d %d %d",len,calc,rate);
@ -459,27 +458,22 @@ struct DivDispatchOscBuffer {
//logE("ELS %d %d %d",end,start,calc);
memset(&data[start],-1,(0x10000-start)*sizeof(short));
memset(data,-1,end*sizeof(short));
data[needle]=lastSample;
//data[needle>>16]=lastSample;
return;
}
memset(&data[start],-1,calc*sizeof(short));
data[needle]=lastSample;
memset(&data[start],-1,(end-start)*sizeof(short));
//data[needle>>16]=lastSample;
}
inline void end(unsigned short len) {
size_t calc=len*rateMul;
if (((calc&OSCBUF_MASK)+needleSub)>OSCBUF_MASK) {
calc+=UINTMAX_C(1)<<OSCBUF_PREC;
}
needleSub=(needleSub+calc)&OSCBUF_MASK;
needle+=calc>>OSCBUF_PREC;
data[needle]=lastSample;
needle+=calc;
//data[needle>>16]=lastSample;
}
void reset() {
memset(data,-1,65536*sizeof(short));
needle=0;
readNeedle=0;
followNeedle=0;
needleSub=0;
lastSample=0;
}
void setRate(unsigned int r) {
@ -491,7 +485,6 @@ struct DivDispatchOscBuffer {
DivDispatchOscBuffer():
rate(65536),
rateMul(UINTMAX_C(1)<<OSCBUF_PREC),
needleSub(0),
needle(0),
readNeedle(0),
followNeedle(0),