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TyrianGbaPoc v90 - Adaptive OPL2 Fidelity Release

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@erspicu erspicu released this 22 Aug 16:56
v90
3c1eeaa

TyrianGbaPoc v90

This release advances the GBA music path from approximate short wavetables to
source-driven adaptive OPL2 samples while retaining the production LOW
Detail / Normal Speed gameplay profile, normal damage, normal campaign
equipment, and no stress-loadout override.

Highlights

  • All 41 tracks retain all nine authored OPL2 source channels.
  • Original LDS/OPL2 patches are rendered offline through the vendored
    OpenTyrian/DOSBox OPL core at 49,716 Hz, then band-limited to the native
    15,768 Hz Maxmod output rate with adaptive root zones, attack, LFO and
    original percussion timbres.
  • Fixes the audible gaps in JukeBox tracks 11, 15 and 16: sustained patches now
    loop correctly, while finite tonal patches follow their authored note hold
    and natural envelope tail instead of being cut at 420 ms.
  • Music remains at the calibrated 90% presentation level and gameplay/UI sound
    effects at 70%.
  • The title screen build identifier now includes the seven-character Git hash
    and eight-digit build date, rendered in an isolated blue palette slot:
    AprTyrianGba-3c1eeaa-20260823.
  • Includes the Game Over spacing correction and the production adaptive
    presentation rules accumulated since v89.

Validation

  • Complete asset rebuild and LOW release build: PASS.
  • Audio catalog: 41 tracks, 334 calibrated sources, 512 sustain-loop zones,
    301 finite-tonal zones, 127 percussion zones, and zero clipped PCM samples.
  • Calibration mean absolute RMS error: 0.022327 dB.
  • 44 generated IT modules: 967 sample headers, all music PCM at 15,768 Hz;
    sample pointers and loop bounds valid.
  • JukeBox automation: playback active, all 44 modules available, and circular
    previous/next switching passed.
  • Native 240x160 title capture verified that only the build identifier changed
    to blue; menu item colours remain unchanged.
  • ROM: 33,472,076 bytes (31.920 MiB), 82,356 bytes below the 32 MiB limit.

SHA-256 checksums are provided as a separate release asset.

Notes

  • A .sav file is not bundled; the game creates normal SRAM state on first
    use.
  • This is an independent fan port and not an official Tyrian release. Tyrian
    and its original assets remain the property of their respective rights
    holders. See THIRD_PARTY_NOTICES.md in the source repository.
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