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Fixed once again to respect mid-line palette changes.

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This commit is contained in:
Thomas Harte 2017-02-06 20:09:12 -05:00
parent 8b8eb787df
commit 474e2e8d2c
2 changed files with 43 additions and 35 deletions
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45
Machines/Atari2600/TIA.cpp
View File

@ -23,6 +23,7 @@ TIA::TIA() :
horizontal_counter_(0),
pixels_start_location_(0),
output_mode_(0),
pixel_target_(nullptr),
background_{0, 0},
background_half_mask_(0)
{
@ -406,17 +407,30 @@ void TIA::output_for_cycles(int number_of_cycles)
if(output_mode_ & blank_flag)
{
if(pixels_start_location_) output_pixels(pixels_start_location_, output_cursor);
if(pixel_target_)
{
output_pixels(pixels_start_location_, output_cursor);
crt_->output_data((unsigned int)(output_cursor - pixels_start_location_) * 2, 2);
pixel_target_ = nullptr;
pixels_start_location_ = 0;
}
int duration = std::min(228, horizontal_counter_) - output_cursor;
crt_->output_blank((unsigned int)(duration * 2));
}
else
{
if(!pixels_start_location_) pixels_start_location_ = output_cursor;
if(!pixels_start_location_)
{
pixels_start_location_ = output_cursor;
pixel_target_ = crt_->allocate_write_area(160);
}
// accumulate an OR'dversion of the output into the collision buffer
draw_playfield(output_cursor, horizontal_counter_);
// convert that into pixels
if(pixel_target_) output_pixels(output_cursor, horizontal_counter_);
// accumulate collision flags
while(output_cursor < horizontal_counter_)
{
@ -426,7 +440,9 @@ void TIA::output_for_cycles(int number_of_cycles)
if(horizontal_counter_ == cycles_per_line)
{
output_pixels(pixels_start_location_, cycles_per_line);
crt_->output_data((unsigned int)(output_cursor - pixels_start_location_) * 2, 2);
pixel_target_ = nullptr;
pixels_start_location_ = 0;
}
}
@ -435,27 +451,23 @@ void TIA::output_for_cycles(int number_of_cycles)
void TIA::output_pixels(int start, int end)
{
// seek a buffer and convert to pixels
const unsigned int length = (unsigned int)(end - start);
uint8_t *pixel_target = crt_->allocate_write_area(length);
int target_position = start - pixels_start_location_;
if(pixel_target)
{
if(playfield_priority_ == PlayfieldPriority::Score)
{
while(start < end && start < first_pixel_cycle + 80)
{
uint8_t buffer_value = collision_buffer_[start - first_pixel_cycle];
*pixel_target = colour_palette_[colour_mask_by_mode_collision_flags_[(int)ColourMode::ScoreLeft][buffer_value]];
pixel_target_[target_position] = colour_palette_[colour_mask_by_mode_collision_flags_[(int)ColourMode::ScoreLeft][buffer_value]];
start++;
pixel_target++;
target_position++;
}
while(start < end)
{
uint8_t buffer_value = collision_buffer_[start - first_pixel_cycle];
*pixel_target = colour_palette_[colour_mask_by_mode_collision_flags_[(int)ColourMode::ScoreRight][buffer_value]];
pixel_target_[target_position] = colour_palette_[colour_mask_by_mode_collision_flags_[(int)ColourMode::ScoreRight][buffer_value]];
start++;
pixel_target++;
target_position++;
}
}
else
@ -464,16 +476,11 @@ void TIA::output_pixels(int start, int end)
while(start < end)
{
uint8_t buffer_value = collision_buffer_[start - first_pixel_cycle];
*pixel_target = colour_palette_[colour_mask_by_mode_collision_flags_[table_index][buffer_value]];
pixel_target_[target_position] = colour_palette_[colour_mask_by_mode_collision_flags_[table_index][buffer_value]];
start++;
pixel_target++;
target_position++;
}
}
}
crt_->output_data(length * 2, 2);
pixels_start_location_ = 0;
}
void TIA::output_line()

1
Machines/Atari2600/TIA.hpp
View File

@ -78,6 +78,7 @@ class TIA {
inline void draw_playfield(int start, int end);
int pixels_start_location_;
uint8_t *pixel_target_;
inline void output_pixels(int start, int end);
// the master counter; counts from 0 to 228 with all visible pixels being in the final 160