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Fixed synchronisation — my two fields weren't of equal length, I wasn't breaking calls to the CRT upon 40/80 transitions, I had the wrong maximum run length. Now I just need to put real pixels back in.

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This commit is contained in:
Thomas Harte 2016-02-19 23:57:57 -05:00
parent 1954f7bcbd
commit a3432120f3
2 changed files with 15 additions and 5 deletions
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19
Machines/Electron/Electron.cpp
View File

@ -20,6 +20,7 @@ static const unsigned int crt_cycles_per_line = crt_cycles_multiplier * cycles_p
static const int first_graphics_line = 38;
static const int first_graphics_cycle = 33;
static const int last_graphics_cycle = 80 + first_graphics_cycle;
Machine::Machine() :
_interrupt_control(0),
@ -401,10 +402,11 @@ inline void Machine::output_pixels(int start_x, int number_of_pixels)
}
bool is40Column = (_screen_mode > 3);
if(!_writePointer || newDivider != _currentOutputDivider)
if(!_writePointer || newDivider != _currentOutputDivider || _isOutputting40Columns != is40Column)
{
_currentOutputDivider = newDivider;
end_pixel_output();
_currentOutputDivider = newDivider;
_isOutputting40Columns = is40Column;
_crt->allocate_write_area(640 / newDivider);
_currentLine = _writePointer = _crt->get_write_target_for_buffer(0);
}
@ -453,6 +455,7 @@ inline void Machine::end_pixel_output()
inline void Machine::update_pixels_to_position(int x, int y)
{
static unsigned int end;
while((display_x < x) || (display_y < y))
{
if(display_x < first_graphics_cycle)
@ -463,19 +466,25 @@ inline void Machine::update_pixels_to_position(int x, int y)
{
_crt->output_sync(9 * crt_cycles_multiplier);
_crt->output_blank((first_graphics_cycle - 9) * crt_cycles_multiplier);
end = _crt->get_field_cycle();
}
continue;
}
if(display_x < first_graphics_cycle+80)
if(display_x < last_graphics_cycle)
{
int cycles_to_output = (display_y < y) ? 80 + first_graphics_cycle - display_x : std::min(80, x - display_x);
int cycles_to_output = (display_y < y) ? last_graphics_cycle - display_x : std::min(last_graphics_cycle - display_x, x - display_x);
output_pixels(display_x, cycles_to_output);
display_x += cycles_to_output;
if(display_x == first_graphics_cycle+80)
if(display_x == last_graphics_cycle)
{
end_pixel_output();
if(_crt->get_field_cycle() - end != 640)
{
printf("!!!\n");
}
}
continue;
}

1
Machines/Electron/Electron.hpp
View File

@ -193,6 +193,7 @@ class Machine: public CPU6502::Processor<Machine>, Tape::Delegate {
// CRT output
unsigned int _currentOutputDivider;
bool _isOutputting40Columns;
uint8_t *_currentLine, *_writePointer;
// Tape.