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Made an attempt to implement interlaced video.

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This commit is contained in:
Thomas Harte 2016-06-12 22:27:58 -04:00
parent 4ad55a7f5e
commit e10535181d
2 changed files with 18 additions and 8 deletions
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24
Components/6560/6560.cpp
View File

@ -13,7 +13,8 @@ using namespace MOS;
MOS6560::MOS6560() :
_crt(new Outputs::CRT::CRT(65*4, 4, Outputs::CRT::NTSC60, 1)),
_horizontal_counter(0),
_vertical_counter(0)
_vertical_counter(0),
_is_odd_frame(false)
{
_crt->set_composite_sampling_function(
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)"
@ -140,7 +141,7 @@ uint16_t MOS6560::get_address()
if(_vertical_counter == 261)
{
_frame_colour_burst_phase ^= 128;
_is_odd_frame ^= true;
_vertical_counter = 0;
_row_counter = -1;
}
@ -184,17 +185,26 @@ uint16_t MOS6560::get_address()
}
// apply vertical sync
if(_vertical_counter < 3) _this_state = State::Sync;
if(
(_vertical_counter < 3 && (_is_odd_frame || !_interlaced)) ||
(_interlaced &&
(
(_vertical_counter == 0 && _horizontal_counter > 32) ||
(_vertical_counter == 1) || (_vertical_counter == 2) ||
(_vertical_counter == 3 && _horizontal_counter <= 32)
)
))
_this_state = State::Sync;
// update the CRT
if(_this_state != _output_state)
{
switch(_output_state)
{
case State::Sync: _crt->output_sync(_cycles_in_state * 4); break;
case State::ColourBurst: _crt->output_colour_burst(_cycles_in_state * 4, _frame_colour_burst_phase, 0); break;
case State::Border: output_border(_cycles_in_state * 4); break;
case State::Pixels: _crt->output_data(_cycles_in_state * 4, 1); break;
case State::Sync: _crt->output_sync(_cycles_in_state * 4); break;
case State::ColourBurst: _crt->output_colour_burst(_cycles_in_state * 4, _is_odd_frame ? 128 : 0, 0); break;
case State::Border: output_border(_cycles_in_state * 4); break;
case State::Pixels: _crt->output_data(_cycles_in_state * 4, 1); break;
}
_output_state = _this_state;
_cycles_in_state = 0;

2
Components/6560/6560.hpp
View File

@ -51,7 +51,7 @@ class MOS6560 {
uint8_t _registers[16];
uint8_t _colours[16];
uint8_t _frame_colour_burst_phase;
bool _is_odd_frame;
void output_border(unsigned int number_of_cycles);
};