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generators: return offset

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This commit is contained in:
coreydunn 2023-07-26 18:22:09 -05:00
parent c6265be5cb
commit 79efcf3bbe
2 changed files with 29 additions and 15 deletions
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34
synth.c
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@ -357,7 +357,7 @@ void synth_new(Synth*s)
s->nchannels=SY_NCHANNELS;
}
void gen_sin(
size_t gen_sin(
float*buffer,
float amplitude,
float freq,
@ -371,15 +371,17 @@ void gen_sin(
float sig=0;
size_t cyclelen=samplerate/freq*4.0;
size_t phase_offset=phase*cyclelen;
for(size_t i=offset;i<count;++i)
size_t i=offset;
for(;i<count;++i)
{
size_t pos=i%(cyclelen*samplerate);
sig=sin((2.0L*M_PI)/(cyclelen)*(pos+phase_offset))*amplitude;
buffer[pos]=(buffer[pos]+sig)/(mix?2.0:1.0);
}
return i;
}
void gen_tri(
size_t gen_tri(
float*buffer,
float amplitude,
float freq,
@ -395,8 +397,9 @@ void gen_tri(
size_t cyclelen=samplerate/freq*4.0;
size_t points[3]={0,cyclelen/4,cyclelen/4*3};
size_t phase_offset=phase*cyclelen;
size_t i=offset;
for(size_t i=offset;i<count;++i)
for(;i<count;++i)
{
size_t pos=i%(cyclelen*samplerate);
@ -417,9 +420,11 @@ void gen_tri(
buffer[i]=(buffer[i]+sig)/(mix?2.0:1.0);
}
return i;
}
void gen_saw(
size_t gen_saw(
float*buffer,
float amplitude,
float freq,
@ -435,8 +440,9 @@ void gen_saw(
size_t cyclelen=samplerate/freq*4.0;
size_t points[3]={0,cyclelen/4,cyclelen/4*3};
size_t phase_offset=phase*cyclelen;
size_t i=offset;
for(size_t i=offset;i<count;++i)
for(;i<count;++i)
{
size_t pos=i%(cyclelen*samplerate);
@ -457,9 +463,11 @@ void gen_saw(
buffer[i]=(buffer[i]+sig)/(mix?2.0:1.0);
}
return i;
}
void gen_pul(
size_t gen_pul(
float*buffer,
float amplitude,
float freq,
@ -472,7 +480,8 @@ void gen_pul(
)
{
float sig=0;
for(size_t i=offset;i<count;++i)
size_t i=offset;
for(;i<count;++i)
{
size_t cyclelen=samplerate/freq*4.0;
size_t pos=i%(cyclelen*samplerate);
@ -499,9 +508,11 @@ void gen_pul(
buffer[i]=(buffer[i]+sig)/(mix?2.0:1.0);
}
return i;
}
void gen_nse(
size_t gen_nse(
float*buffer,
float amplitude,
float freq,
@ -512,11 +523,14 @@ void gen_nse(
)
{
float sig=0;
size_t i=offset;
samplerate=samplerate; // Inhibit unused variable warning
freq=freq; // Inhibit unused variable warning
for(size_t i=offset;i<count;++i)
for(;i<count;++i)
{
sig=(fmod(frand(),1.0)-fmod(frand(),1.0))*amplitude;
buffer[i]=(buffer[i]+sig)/(mix?2.0:1.0);
}
return i;
}

10
synth.h
View File

@ -54,7 +54,7 @@ typedef struct Note
void synth_recalc(Synth*synth);
void synth_new(Synth*s);
void gen_sin(
size_t gen_sin(
float*buffer,
float amplitude,
float freq,
@ -65,7 +65,7 @@ void gen_sin(
size_t offset
);
void gen_tri(
size_t gen_tri(
float*buffer,
float amplitude,
float freq,
@ -76,7 +76,7 @@ void gen_tri(
size_t offset
);
void gen_saw(
size_t gen_saw(
float*buffer,
float amplitude,
float freq,
@ -87,7 +87,7 @@ void gen_saw(
size_t offset
);
void gen_pul(
size_t gen_pul(
float*buffer,
float amplitude,
float freq,
@ -99,7 +99,7 @@ void gen_pul(
size_t offset
);
void gen_nse(
size_t gen_nse(
float*buffer,
float amplitude,
float freq,