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Marks out and approximately centres a pixel region.

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This commit is contained in:
Thomas Harte 2021-03-18 22:41:20 -04:00
parent fe3e8f87e7
commit 871bac6c8a
1 changed files with 30 additions and 5 deletions
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35
Machines/Sinclair/ZXSpectrum/Video.hpp
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@ -79,7 +79,7 @@ template <VideoTiming timing> class Video {
void run_for(HalfCycles duration) {
constexpr auto timings = get_timings();
constexpr int first_line = timings.first_delay / timings.cycles_per_line;
constexpr int sync_position = 200 * 2;
constexpr int sync_position = 166 * 2;
constexpr int sync_length = 14 * 2;
int cycles_remaining = duration.as<int>();
@ -92,7 +92,7 @@ template <VideoTiming timing> class Video {
if(line < 3) {
// Output sync line.
crt_.output_sync(cycles_this_line);
} else /* if((line < first_line) || (line >= first_line+192)) */ {
} else if((line < first_line) || (line >= first_line+192)) {
// Output plain border line.
if(offset < sync_position) {
const int border_duration = std::min(sync_position, end_offset) - offset;
@ -110,9 +110,34 @@ template <VideoTiming timing> class Video {
const int border_duration = end_offset - offset;
output_border(border_duration);
}
} /* else {
// TODO: output pixel line.
} */
} else {
// Output pixel line.
if(offset < 256) {
// TODO: actual pixels.
const int pixel_duration = std::min(256, end_offset) - offset;
uint8_t *const colour_pointer = crt_.begin_data(1);
if(colour_pointer) *colour_pointer = 0;
crt_.output_level(pixel_duration);
offset += pixel_duration;
}
if(offset >= 256 && offset < sync_position && end_offset > offset) {
const int border_duration = std::min(sync_position, end_offset) - offset;
output_border(border_duration);
offset += border_duration;
}
if(offset >= sync_position && offset < sync_position+sync_length && end_offset > offset) {
const int sync_duration = std::min(sync_position + sync_length, end_offset) - offset;
crt_.output_sync(sync_duration);
offset += sync_duration;
}
if(offset >= sync_position + sync_length && end_offset > offset) {
const int border_duration = end_offset - offset;
output_border(border_duration);
}
}
cycles_remaining -= cycles_this_line;
time_since_interrupt_ = (time_since_interrupt_ + cycles_this_line) % (timings.cycles_per_line * timings.lines_per_frame);