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Merge branch 'VicAudio' into Vic-20

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This commit is contained in:
Thomas Harte
2016-06-13 19:34:13 -04:00
parent 2d23bc46f2 5fc36b956c
commit f1a45c1011
3 changed files with 66 additions and 3 deletions
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Components/6560/6560.cpp
+48 -2
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@@ -14,6 +14,7 @@ MOS6560::MOS6560() :
_crt(new Outputs::CRT::CRT(65*4, 4, Outputs::CRT::NTSC60, 1)),
_horizontal_counter(0),
_vertical_counter(0),
_cycles_since_speaker_update(0),
_is_odd_frame(false)
{
_crt->set_composite_sampling_function(
@@ -56,6 +57,7 @@ MOS6560::MOS6560() :
// show the middle 90%
_crt->set_visible_area(Outputs::CRT::Rect(0.05f, 0.05f, 0.9f, 0.9f));
_speaker.set_input_rate(63920.4375); // assuming NTSC; clock rate / 16
}
void MOS6560::set_register(int address, uint8_t value)
@@ -88,9 +90,18 @@ void MOS6560::set_register(int address, uint8_t value)
_video_matrix_start_address = (uint16_t)((_video_matrix_start_address & 0x0200) | ((value & 0xf0) << 6));
break;
case 0xa:
case 0xb:
case 0xc:
case 0xd:
update_audio();
_speaker.set_control(address - 0xa, value);
break;
case 0xe:
update_audio();
_auxiliary_colour = _colours[value >> 4];
// TODO: sound amplitude
_speaker.set_volume(value & 0xf);
break;
case 0xf:
@@ -122,7 +133,6 @@ uint8_t MOS6560::get_register(int address)
}
}
void MOS6560::output_border(unsigned int number_of_cycles)
{
uint8_t *colour_pointer = _crt->allocate_write_area(1);
@@ -132,6 +142,8 @@ void MOS6560::output_border(unsigned int number_of_cycles)
uint16_t MOS6560::get_address()
{
_cycles_since_speaker_update++;
_horizontal_counter++;
if(_horizontal_counter == 65)
{
@@ -297,3 +309,37 @@ void MOS6560::set_graphics_value(uint8_t value, uint8_t colour_value)
}
}
}
void MOS6560::update_audio()
{
// _speaker.run_for_cycles(_cycles_since_speaker_update >> 4);
_cycles_since_speaker_update &= 15;
}
#pragma mark - Audio
MOS6560Speaker::MOS6560Speaker()
{
}
void MOS6560Speaker::set_volume(uint8_t volume)
{
// printf("Volume is %d\n", volume);
}
void MOS6560Speaker::set_control(int channel, uint8_t volume)
{
// NTSC: 1022727
//N: bass switch, R: freq f=Phi2/256/(255-$900a) NTSC: Phi2=14318181/14 Hz
//O: alto switch, S: freq f=Phi2/128/(255-$900b) PAL: Phi2=4433618/4 Hz
//P: soprano switch, T: freq f=Phi2/64/(255-$900c)
//Q: noise switch, U: freq f=Phi2/32/(255-$900d)
}
void MOS6560Speaker::get_samples(unsigned int number_of_samples, int16_t *target)
{
}
void MOS6560Speaker::skip_samples(unsigned int number_of_samples)
{
}