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Implemented non-linear volume.

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This commit is contained in:
Thomas Harte 2016-10-19 23:07:51 -04:00
parent c24c1bf3b1
commit cd59eb5f43
2 changed files with 15 additions and 5 deletions
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19
Components/AY38910/AY38910.cpp
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@ -64,6 +64,15 @@ AY38910::AY38910() :
}
}
}
// set up volume lookup table
float max_volume = 8192;
float root_two = sqrtf(2.0f);
for(int v = 0; v < 16; v++)
{
_volumes[v] = (int)(max_volume / powf(root_two, (float)(v ^ 0xf)));
}
_volumes[0] = 0;
}
void AY38910::set_clock_rate(double clock_rate)
@ -147,11 +156,11 @@ void AY38910::get_samples(unsigned int number_of_samples, int16_t *target)
#undef channel_volume
// Mix additively. TODO: non-linear volume.
target[c] = (int16_t)((
volumes[0] * channel_levels[0] +
volumes[1] * channel_levels[1] +
volumes[2] * channel_levels[2]
) * 512);
target[c] = (int16_t)(
_volumes[volumes[0]] * channel_levels[0] +
_volumes[volumes[1]] * channel_levels[1] +
_volumes[volumes[2]] * channel_levels[2]
);
}
}

1
Components/AY38910/AY38910.hpp
View File

@ -59,6 +59,7 @@ class AY38910: public ::Outputs::Filter<AY38910> {
int _channel_dividers[3];
int _channel_output[3];
int _volumes[16];
int _master_divider;