AuroraMiddleware/AuroraOpenALSoft
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

Add a cosine resampler

Browse Source
This commit is contained in:
Chris Robinson 2010-01-11 06:19:54 -08:00
parent 705849ca73
commit 93b584ff84
3 changed files with 19 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
Alc/ALu.c
View File

@ -870,6 +870,11 @@ static __inline ALfloat lerp(ALfloat val1, ALfloat val2, ALint frac)
{
return val1 + ((val2-val1)*(frac * (1.0f/(1<<FRACTIONBITS))));
}
static __inline ALfloat cos_lerp(ALfloat val1, ALfloat val2, ALint frac)
{
ALfloat mult = (1.0f-cos(frac * (1.0f/(1<<FRACTIONBITS)) * M_PI)) * 0.5f;
return val1 + ((val2-val1)*mult);
}
static void MixSomeSources(ALCcontext *ALContext, float (*DryBuffer)[OUTPUTCHANNELS], ALuint SamplesToDo)
{
@ -1106,6 +1111,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}
@ -1153,6 +1160,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}
@ -1171,6 +1180,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}
@ -1190,6 +1201,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}
@ -1210,6 +1223,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}
@ -1230,6 +1245,8 @@ another_source:
break;
case LINEAR: DO_MIX(lerp);
break;
case COSINE: DO_MIX(cos_lerp);
break;
case RESAMPLER_MAX:
break;
}

1
OpenAL32/Include/alSource.h
View File

@ -25,6 +25,7 @@ extern "C" {
typedef enum {
POINT = 0,
LINEAR,
COSINE,
RESAMPLER_MAX
} resampler_t;

1
alsoftrc.sample
View File

@ -64,6 +64,7 @@
# Selects the resampler used when mixing sources. Valid values are:
# 0 - None (nearest sample, no interpolation)
# 1 - Linear (extrapolates samples using a linear slope between samples)
# 2 - Cosine (extrapolates using a (co)sine slope)
# Specifying other values will result in using the default (linear).
#resampler = 1