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Took a shot at reinstating the horizontal blank extend flag.

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This commit is contained in:
Thomas Harte 2017-02-09 18:37:19 -05:00
parent 70745286a5
commit 2e9ef2b0ef
2 changed files with 18 additions and 1 deletions
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16
Machines/Atari2600/TIA.cpp
View File

@ -351,6 +351,7 @@ void TIA::set_ball_motion(uint8_t motion)
void TIA::move() void TIA::move()
{ {
horizontal_blank_extend_ = true;
} }
void TIA::clear_motion() void TIA::clear_motion()
@ -389,9 +390,10 @@ void TIA::output_for_cycles(int number_of_cycles)
if(!output_cursor) if(!output_cursor)
{ {
memset(collision_buffer_, 0, sizeof(collision_buffer_)); memset(collision_buffer_, 0, sizeof(collision_buffer_));
horizontal_blank_extend_ = false;
} }
// accumulate an OR'dversion of the output into the collision buffer // accumulate an OR'd version of the output into the collision buffer
draw_playfield(output_cursor, horizontal_counter_); draw_playfield(output_cursor, horizontal_counter_);
// convert to television signals // convert to television signals
@ -476,6 +478,16 @@ void TIA::output_pixels(int start, int end)
{ {
int target_position = start - pixels_start_location_; int target_position = start - pixels_start_location_;
if(start < first_pixel_cycle+8 && horizontal_blank_extend_)
{
while(start < end && start < first_pixel_cycle+8)
{
pixel_target_[target_position] = 0;
start++;
target_position++;
}
}
if(playfield_priority_ == PlayfieldPriority::Score) if(playfield_priority_ == PlayfieldPriority::Score)
{ {
while(start < end && start < first_pixel_cycle + 80) while(start < end && start < first_pixel_cycle + 80)
@ -519,12 +531,14 @@ void TIA::output_line()
crt_->output_sync(32); crt_->output_sync(32);
crt_->output_blank(32); crt_->output_blank(32);
crt_->output_sync(392); crt_->output_sync(392);
horizontal_blank_extend_ = false;
break; break;
case blank_flag: case blank_flag:
crt_->output_blank(32); crt_->output_blank(32);
crt_->output_sync(32); crt_->output_sync(32);
crt_->output_default_colour_burst(32); crt_->output_default_colour_burst(32);
crt_->output_blank(360); crt_->output_blank(360);
horizontal_blank_extend_ = false;
break; break;
} }
} }

3
Machines/Atari2600/TIA.hpp
View File

@ -153,6 +153,9 @@ class TIA {
struct Missile { struct Missile {
int size; // 0 = 1 pixel, 1 = 2 pixels, etc int size; // 0 = 1 pixel, 1 = 2 pixels, etc
} missile_[2]; } missile_[2];
// movement
bool horizontal_blank_extend_;
}; };
} }