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Corrects semantics on contended-timing calculation.

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This commit is contained in:
Thomas Harte 2021-03-22 15:48:51 -04:00
parent a26716919c
commit bdb3bce8d6
1 changed files with 3 additions and 3 deletions
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6
Machines/Sinclair/ZXSpectrum/Video.hpp
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@ -51,7 +51,7 @@ template <VideoTiming timing> class Video {
int cycles_per_line; int cycles_per_line;
int lines_per_frame; int lines_per_frame;
int first_delay; int first_delay;
int first_border; int contended_period;
int delays[16]; int delays[16];
}; };
@ -60,7 +60,7 @@ template <VideoTiming timing> class Video {
.cycles_per_line = 228 * 2, .cycles_per_line = 228 * 2,
.lines_per_frame = 311, .lines_per_frame = 311,
.first_delay = 14361 * 2, .first_delay = 14361 * 2,
.first_border = 14490 * 2, .contended_period = (14490 - 14361) * 2,
.delays = { .delays = {
2, 1, 2, 1,
0, 0, 0, 0,
@ -246,7 +246,7 @@ template <VideoTiming timing> class Video {
if(lines >= 192) return 0; if(lines >= 192) return 0;
const int line_position = time_since % timings.cycles_per_line; const int line_position = time_since % timings.cycles_per_line;
if(line_position >= timings.first_border - timings.first_delay) return 0; if(line_position >= timings.contended_period) return 0;
return timings.delays[line_position & 15]; return timings.delays[line_position & 15];
} }