Add large-file (>1MB) OPL4 loading and fix track-end hang

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- One-shot cold loader (asm/opl4_loader.asm, overlaid into plugin
  page 5) uploads embedded PCM sample blocks into ZXM-MoonSound SRAM
  and compacts the VGM stream in place, letting files over the normal
  64-page megabuffer budget play back through the existing pipeline.
- instant_abort() was filling only one of the two ISR command buffers
  with the shutdown chain; the chain (SILENCE_OPL + WAVE_OFF/TL +
  CMD_ISR_DONE) doesn't fit in one buffer, so after the first
  CMD_END_BUF the ISR swapped into stale data and never reached
  CMD_ISR_DONE, hanging at the end of long tracks instead of
  advancing to the next one. Now fills both buffers while frozen and
  syncs update_buffer()'s own ready-tracking state.
- Switch to 14MHz before the SRAM upload (previously ran at whatever
  speed WC's file I/O left active) and show "Loading..." for .vgz and
  files >= 1MB, since the busy-waited upload takes several seconds.
- Confirmed on real hardware: long OPL4 tracks (previously stuck
  looping at the end) now finish and advance normally, ESC exits
  cleanly.

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This commit is contained in:

alex

2026-09-16 20:14:06 +03:00

parent ffee082140

commit 54112347f5

10 changed files with 1240 additions and 165 deletions

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