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es5503: use put_int for sample scaling, use fill_n for faster clear [R. Belmont]

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This commit is contained in:
arbee 2020-09-24 08:49:38 -04:00
parent 194ba382d3
commit 2fb9f38b83
2 changed files with 10 additions and 7 deletions
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14
src/devices/sound/es5503.cpp
View File

@ -129,14 +129,13 @@ void es5503_device::halt_osc(int onum, int type, uint32_t *accumulator, int ress
}
void es5503_device::sound_stream_update(sound_stream &stream, std::vector<read_stream_view> const &inputs, std::vector<write_stream_view> &outputs)
{
static int32_t mix[(44100/60)*2*8];
int32_t *mixp;
int osc, snum, i;
uint32_t ramptr;
int samples = outputs[0].samples();
assert(samples < (44100/60)*2);
memset(mix, 0, sizeof(mix));
std::fill_n(&m_mix_buffer[0], samples*output_channels, 0);
for (int chan = 0; chan < output_channels; chan++)
{
@ -155,7 +154,7 @@ void es5503_device::sound_stream_update(sound_stream &stream, std::vector<read_s
int8_t data = -128;
int resshift = resshifts[pOsc->resolution] - pOsc->wavetblsize;
uint32_t sizemask = accmasks[pOsc->wavetblsize];
mixp = &mix[0] + chan;
mixp = &m_mix_buffer[0] + chan;
for (snum = 0; snum < samples; snum++)
{
@ -197,11 +196,14 @@ void es5503_device::sound_stream_update(sound_stream &stream, std::vector<read_s
}
}
}
mixp = &mix[0];
constexpr stream_buffer::sample_t sample_scale = 1.0 / (32768.0 * 8.0);
mixp = &m_mix_buffer[0];
for (int chan = 0; chan < output_channels; chan++)
{
for (i = 0; i < outputs[chan].samples(); i++)
outputs[chan].put(i, stream_buffer::sample_t(*mixp++) * sample_scale);
{
outputs[chan].put_int(i, *mixp++, 32768*8);
}
}
}

3
src/devices/sound/es5503.h
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@ -84,7 +84,8 @@ private:
uint32_t output_rate;
emu_timer *m_timer;
std::vector<int32_t> m_mix_buffer;
int32_t m_mix_buffer[(44100/60)*2*8];
void halt_osc(int onum, int type, uint32_t *accumulator, int resshift);
};