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modconv: write the clamped loop back to the .hit sample header

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Rix
2026-10-10 16:09:38 -07:00
parent 0a200d8c21
commit dc408d2754
1 changed files with 7 additions and 2 deletions
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tools/modconv/modconv.cc
+7 -2
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@@ -72,8 +72,9 @@ namespace {
// - anything after the loop end is never heard on a MOD player, so it is dropped.
// The first word is skipped like for one-shot samples, unless the loop starts at word 0, in which case
// it is part of the loop body and has to be kept.
// modplayer derives skip and pad from the LoopStart field with the same formulas to compute 9xx sample
// offsets, so they are part of the .hit contract.
// The loop fields written to the .hit file are the clamped loop, 0 and 1 for one-shot samples. modplayer
// derives skip and pad from them with the same formulas to compute 9xx sample offsets, so they are part
// of the .hit contract.
struct SampleLayout {
bool hasLoop = false;
unsigned loopStart = 0; // bytes
@@ -300,6 +301,10 @@ both the pattern and sample data.
layout.exact ? "" : ", loop period rounded to a whole block");
}
sample.get<SampleLength>().value = encodedLength;
// Write back the loop that was actually encoded, after clamping, so that the player's 9xx
// offsets wrap against the same loop.
sample.get<SampleLoopStart>().value = layout.hasLoop ? layout.loopStart / 2 : 0;
sample.get<SampleLoopLength>().value = layout.hasLoop ? layout.loopLength / 2 : 1;
if (encodedLength >= 65536) {
fmt::print("Sample too big.\n");
return -1;