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Fixed colour burst acceptance, switched to an integral single byte streaming of Atari colours.

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This commit is contained in:
Thomas Harte 2016-04-25 20:56:15 -04:00
parent 6d769b3639
commit 6c567d166a
3 changed files with 19 additions and 15 deletions
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31
Machines/Atari2600/Atari2600.cpp
View File

@ -30,14 +30,15 @@ Machine::Machine() :
void Machine::setup_output(float aspect_ratio)
{
_crt = new Outputs::CRT::CRT(228, 1, 263, Outputs::CRT::ColourSpace::YIQ, 228, 1, 2);
_crt = new Outputs::CRT::CRT(228, 1, 263, Outputs::CRT::ColourSpace::YIQ, 228, 1, 1);
_crt->set_composite_sampling_function(
"float composite_sample(usampler2D texID, vec2 coordinate, vec2 iCoordinate, float phase, float amplitude)\n"
"{\n"
"vec2 c = vec2(texture(texID, coordinate).rg) / vec2(255.0);"
"float y = 0.1 + c.x * 0.91071428571429;"
"float aOffset = 6.283185308 * (2.0/16.0 - c.y);" // - 3.0 / 16.0
"return y + step(0.03125, c.y) * amplitude * cos(phase - aOffset);"
"{"
"uint c = texture(texID, coordinate).r;"
"uint y = (c >> 1) & 7u;"
"uint iPhase = (c >> 4);"
"float phaseOffset = 6.283185308 * float(iPhase + 13u) / 16.0;"
"return (float(y) / 7.0) * (1.0 - amplitude) + step(1, iPhase) * amplitude * cos(phase + phaseOffset);"
"}");
_crt->set_output_device(Outputs::CRT::Television);
}
@ -156,9 +157,8 @@ void Machine::get_output_pixel(uint8_t *pixel, int offset)
if(playerPixels[0] || missilePixels[0]) outputColour = _playerColour[0];
}
// map that colour to separate Y and phase components
pixel[0] = (outputColour << 4)&0xe0;
pixel[1] = outputColour&0xf0;
// store colour
pixel[0] = outputColour;
}
// in imputing the knowledge that all we're dealing with is the rollover from 159 to 0,
@ -169,6 +169,7 @@ void Machine::output_pixels(unsigned int count)
{
const int32_t start_of_sync = 214;
const int32_t end_of_sync = 198;
const int32_t end_of_colour_burst = 188;
while(count--)
{
@ -208,7 +209,8 @@ void Machine::output_pixels(unsigned int count)
state = OutputState::Pixel;
}
}
else if(_horizontalTimer < end_of_sync) state = OutputState::Blank;
else if(_horizontalTimer < end_of_colour_burst) state = OutputState::Blank;
else if(_horizontalTimer < end_of_sync) state = OutputState::ColourBurst;
else if(_horizontalTimer < start_of_sync) state = OutputState::Sync;
else state = OutputState::Blank;
@ -220,9 +222,10 @@ void Machine::output_pixels(unsigned int count)
_lastOutputStateDuration++;
if(state != _lastOutputState) {
switch(_lastOutputState) {
case OutputState::Blank: _crt->output_blank(_lastOutputStateDuration); break;
case OutputState::Sync: _crt->output_sync(_lastOutputStateDuration); break;
case OutputState::Pixel: _crt->output_data(_lastOutputStateDuration, 1); break;
case OutputState::Blank: _crt->output_blank(_lastOutputStateDuration); break;
case OutputState::Sync: _crt->output_sync(_lastOutputStateDuration); break;
case OutputState::ColourBurst: _crt->output_colour_burst(_lastOutputStateDuration, 96, 0); break;
case OutputState::Pixel: _crt->output_data(_lastOutputStateDuration, 1); break;
}
_lastOutputStateDuration = 0;
_lastOutputState = state;
@ -236,7 +239,7 @@ void Machine::output_pixels(unsigned int count)
if(_horizontalTimer < (_vBlankExtend ? 152 : 160)) {
if(_outputBuffer)
get_output_pixel(&_outputBuffer[_lastOutputStateDuration << 1], 159 - _horizontalTimer);
get_output_pixel(&_outputBuffer[_lastOutputStateDuration], 159 - _horizontalTimer);
// increment all graphics counters
increment_object_counter(0);

1
Machines/Atari2600/Atari2600.hpp
View File

@ -87,6 +87,7 @@ class Machine: public CPU6502::Processor<Machine> {
enum OutputState {
Sync,
Blank,
ColourBurst,
Pixel
};

2
Outputs/CRT/CRT.cpp
View File

@ -299,7 +299,7 @@ void CRT::output_scan(const Scan *const scan)
{
if(_horizontal_flywheel->get_current_time() < (_horizontal_flywheel->get_standard_period() * 12) >> 6)
{
_colour_burst_time = (uint16_t)_colour_burst_time;
_colour_burst_time = (uint16_t)_horizontal_flywheel->get_current_time();
_colour_burst_phase = scan->phase;
_colour_burst_amplitude = scan->amplitude;
}