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Some mild fixes get me up to having a rolling screen of vertical lines. Which is what I was hoping for right now!

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This commit is contained in:
Thomas Harte 2017-01-29 22:16:23 -05:00
parent 1cc13b2799
commit 92754ace7a
4 changed files with 45 additions and 11 deletions
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4
Machines/Atari2600/Atari2600.cpp
View File

@ -130,8 +130,8 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
} else {
const uint16_t decodedAddress = address & 0x3f;
switch(decodedAddress) {
case 0x00: update_video(); tia_->set_vsync(!!(*value & 0x02)); break;
case 0x01: update_video(); tia_->set_vblank(!!(*value & 0x02)); break;
case 0x00: update_video(); tia_->set_sync(!!(*value & 0x02)); break;
case 0x01: update_video(); tia_->set_blank(!!(*value & 0x02)); break;
case 0x02:
set_ready_line(true);

43
Machines/Atari2600/TIA.cpp
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@ -11,12 +11,17 @@
using namespace Atari2600;
namespace {
const int cycles_per_line = 228;
const int sync_flag = 0x1;
const int blank_flag = 0x2;
}
TIA::TIA() :
horizontal_counter_(0),
output_cursor_(0),
pixel_target_(nullptr)
pixel_target_(nullptr),
requested_output_mode_(0),
output_mode_(0)
{
crt_.reset(new Outputs::CRT::CRT(cycles_per_line * 2 + 1, 1, Outputs::CRT::DisplayType::NTSC60, 1));
crt_->set_output_device(Outputs::CRT::Television);
@ -95,12 +100,14 @@ void TIA::run_for_cycles(int number_of_cycles)
}
}
void TIA::set_vsync(bool vsync)
void TIA::set_sync(bool sync)
{
requested_output_mode_ = (requested_output_mode_ & ~sync_flag) | (sync ? sync_flag : 0);
}
void TIA::set_vblank(bool vblank)
void TIA::set_blank(bool blank)
{
requested_output_mode_ = (requested_output_mode_ & ~blank_flag) | (blank ? blank_flag : 0);
}
void TIA::reset_horizontal_counter()
@ -230,7 +237,12 @@ void TIA::output_for_cycles(int number_of_cycles)
8 cycles: blank or pixels, depending on whether the blank extend bit is set
152 cycles: pixels
*/
// if(output_mode_ != requested_output_mode_)
// {
// // flush the old output
// }
horizontal_counter_ += number_of_cycles;
if(!output_cursor_ && horizontal_counter_ >= 16)
{
crt_->output_blank(32);
@ -248,7 +260,7 @@ void TIA::output_for_cycles(int number_of_cycles)
}
if(output_cursor_ == 48 && horizontal_counter_ >= 68)
{
crt_->output_default_colour_burst(40);
crt_->output_blank(40);
output_cursor_ = 68;
}
if(horizontal_counter_ > 68)
@ -272,10 +284,29 @@ void TIA::output_for_cycles(int number_of_cycles)
}
}
horizontal_counter_ %= cycles_per_line;
output_cursor_ %= cycles_per_line;
}
void TIA::output_line()
{
// TODO: optimise special case
output_for_cycles(cycles_per_line);
output_mode_ = requested_output_mode_;
switch(output_mode_)
{
default:
// TODO: optimise special case
output_for_cycles(cycles_per_line);
break;
case sync_flag:
case sync_flag | blank_flag:
crt_->output_sync(32);
crt_->output_blank(32);
crt_->output_sync(392);
break;
case blank_flag:
crt_->output_blank(32);
crt_->output_sync(32);
crt_->output_default_colour_burst(32);
crt_->output_blank(360);
break;
}
}

8
Machines/Atari2600/TIA.hpp
View File

@ -26,8 +26,8 @@ class TIA {
void run_for_cycles(int number_of_cycles);
void set_output_mode(OutputMode output_mode);
void set_vsync(bool vsync);
void set_vblank(bool vblank);
void set_sync(bool sync);
void set_blank(bool blank);
void reset_horizontal_counter(); // Reset is delayed by four cycles.
int get_cycles_until_horizontal_blank(unsigned int from_offset);
@ -68,7 +68,11 @@ class TIA {
std::shared_ptr<Outputs::CRT::CRT> crt_;
int horizontal_counter_;
int output_cursor_;
int output_mode_;
int requested_output_mode_;
uint8_t *pixel_target_;
void output_for_cycles(int number_of_cycles);

1
OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
View File

@ -69,7 +69,6 @@
useCustomWorkingDirectory = "NO"
ignoresPersistentStateOnLaunch = "NO"
debugDocumentVersioning = "YES"
enableAddressSanitizer = "YES"
debugServiceExtension = "internal"
allowLocationSimulation = "NO">
<BuildableProductRunnable