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Added 60Hz output support.

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This commit is contained in:
Thomas Harte 2016-10-20 07:34:23 -04:00
parent 73365e1877
commit 21cfb39ed9
2 changed files with 22 additions and 6 deletions
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23
Machines/Oric/Video.cpp
View File

@ -10,13 +10,24 @@
using namespace Oric;
namespace {
const unsigned int PAL50VSyncStartPosition = 256*64;
const unsigned int PAL60VSyncStartPosition = 234*64;
const unsigned int PAL50VSyncEndPosition = 259*64;
const unsigned int PAL60VSyncEndPosition = 238*64;
const unsigned int PAL50Period = 312*64;
const unsigned int PAL60Period = 262*64;
}
VideoOutput::VideoOutput(uint8_t *memory) :
_ram(memory),
_frame_counter(0), _counter(0),
_state(Sync), _cycles_in_state(0),
_is_graphics_mode(false),
_character_set_base_address(0xb400),
_phase(0)
_phase(0),
_v_sync_start_position(PAL50VSyncStartPosition), _v_sync_end_position(PAL50VSyncEndPosition),
_counter_period(PAL50Period), _next_frame_is_sixty_hertz(false)
{
_crt.reset(new Outputs::CRT::CRT(64*6, 6, Outputs::CRT::DisplayType::PAL50, 1));
@ -45,7 +56,7 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
while(number_of_cycles--)
{
_counter = (_counter + 1)%(312 * 64); // TODO: NTSC
_counter = (_counter + 1)%_counter_period;
int h_counter =_counter & 63;
if(!h_counter)
@ -60,13 +71,17 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
{
_phase += 128;
_frame_counter++;
_v_sync_start_position = _next_frame_is_sixty_hertz ? PAL60VSyncStartPosition : PAL50VSyncStartPosition;
_v_sync_end_position = _next_frame_is_sixty_hertz ? PAL60VSyncEndPosition : PAL50VSyncEndPosition;
_counter_period = _next_frame_is_sixty_hertz ? PAL60Period : PAL50Period;
}
}
State new_state = Blank;
if(
(h_counter >= 48 && h_counter <= 53) ||
(_counter >= 256*64 && _counter <= 259*64)) new_state = Sync;
(_counter >= _v_sync_start_position && _counter <= _v_sync_end_position)) new_state = Sync;
else if(h_counter >= 54 && h_counter <= 56) new_state = ColourBurst;
else if(_counter < 224*64 && h_counter < 40) new_state = Pixels;
@ -150,7 +165,7 @@ void VideoOutput::run_for_cycles(int number_of_cycles)
case 0x18: case 0x19: case 0x1a: case 0x1b:
case 0x1c: case 0x1d: case 0x1e: case 0x1f:
_is_graphics_mode = (control_byte & 4);
_is_sixty_hertz = !(control_byte & 2);
_next_frame_is_sixty_hertz = !(control_byte & 2);
break;
default: break;

5
Machines/Oric/Video.hpp
View File

@ -23,8 +23,9 @@ class VideoOutput {
uint8_t *_ram;
std::shared_ptr<Outputs::CRT::CRT> _crt;
// Counters
// Counters and limits
int _counter, _frame_counter;
int _v_sync_start_position, _v_sync_end_position, _counter_period;
// Output state
enum State {
@ -44,7 +45,7 @@ class VideoOutput {
}
bool _is_graphics_mode;
bool _is_sixty_hertz;
bool _next_frame_is_sixty_hertz;
bool _use_alternative_character_set;
bool _use_double_height_characters;
bool _blink_text;