Lost Odyssey Steprant Android 1.8

Download Steprant Android 1.8 APK · Android guide · Changelog

An independent Android edition maintained by Steprant, based on the official Lost Odyssey Recomp v1.1.0 by Frank / freefrank and the original community. 1.8 collects everything since the first Steprant build and installs over 1.5, 1.6 and 1.7 test builds (same package and signing key).

All figures below were measured on one device: Xiaomi 14, Snapdragon 8 Gen 3, Adreno 750, Turnip Mesa, 2670×1200 panel, 30 FPS, with the in-game Tester. Each row compares sessions on the same maps and settings unless noted. Results depend on device, driver, scene and settings.

Results at a glance

What was measured	Before	1.8	Change
Frames over 50 ms per minute, city (900p, SGSR2 Quality)	18.2	6.2	−66%
Frames over 50 ms per minute, open field (same settings)	20.7	10.0	−52%
99th percentile frame time, city	48.5 ms	37.5 ms	−23%
99th percentile frame time, open field	51.2 ms	39.0 ms	−24%
GPU time per frame: 2403×1080 native → 1780×800 + SGSR2 (same session)	~23 ms	16–17 ms	−26 to −30%
GPU occupancy at 30 FPS: native 1080 → SGSR2 Quality (same session)	81%	66–74%	−9 to −19%
Render passes per frame (depth-only draws kept in the scene pass)	100%	~60%	−40%
GPU time inside render passes (same change)	100%	~92%	−8%
Render passes split by an EDRAM resolve, city	14.7	7.1	−52%
Render passes split by an EDRAM resolve, open field	15.0	8.6	−43%
Hitches at every menu, loading screen and fade (resolution switch)	40–300 ms each	none: no switch	−100%
GPU occupancy in menus (1)	~60%	28–40%	−33 to −53%
XMA audio decode errors	bursts of 12–14 thousand in about a second, every session	56 and 150 in whole sessions	over −99%
Audio queue running empty (1)	74–91 per session	0	−100%
Shadow casters kept with dynamic shadows on Low	8	16	×2
Memory per pixel of 8-bit render targets (previously stored as 16-bit float)	8 bytes	4 bytes	−50%

(1) Different sessions and scenes, before and after the change; indicative.

Not reduced in 1.8: GPU occupancy in gameplay at the new defaults stays at about 60–65% at 30 FPS. The gains above are in smoothness, image quality and redundant work, not in total GPU load; that is the target of 2.0.

Defaults on a fresh install

900p render resolution, Anti-aliasing → SGSR2 at Quality (SMAA before the upscale), shadow resolution ×2, 30 FPS. Existing settings files are kept as they are.

Every improvement, point by point

Smoothness

1. Resolve copies wait for the end of the render pass (EDRAM emulation). A copy out of the active pass used to end it, store everything and reload it in the next pass; now it runs at the end of the pass whenever nothing in between touches the copied area. The copied pixels are identical. → −43 to −52% passes split this way; together with the change below, −52 to −66% frames over 50 ms and −23 to −24% on the 99th percentile.
2. Render passes begin over the drawn area instead of the whole target where the draws stay inside it; a pass that has to grow restarts once over the whole target (no repeated reloads).
3. No resolution switch in menus, loading screens and fades (also the boot title): the interface is drawn at display resolution over the enlarged background. → every 40–300 ms hitch at those transitions removed; menu GPU load −33 to −53%.
4. Render targets reused after a resolution switch and back (two sizes per kind, 512 MB budget): switches now happen only when you change settings.
5. Display refresh follows the game frame rate (the 120 Hz panel runs at the game's pace).
6. A breakdown of every frame over 50 ms in the Tester log (guest idle, GPU wait, present stage, pacing), to find the remaining ones.

GPU work

7. Qualcomm SGSR2 temporal upscaling (Anti-aliasing → SGSR2, Quality/Balanced/Performance/Native AA): renders at 1/1.5–1/2 of the output and reconstructs it from jitter, depth and camera motion. → −26 to −30% GPU time per frame against native 2403×1080 in the same session.
8. Depth-only draws stay in the scene's render pass and run their vertex shaders without unused outputs. → −40% render passes, −8% GPU time in passes.
9. Early depth rejection kept (Adreno LRZ): pixel shaders keep early depth testing unless the game enables the alpha test. Existing shader packs stay valid.
10. Compact render targets: 8-bit and 10-bit targets live in 8-bit/10-bit memory instead of 16-bit float. → −50% memory per pixel on those targets; their pipelines are prepared at startup.
11. Attachments with undefined contents are no longer loaded.
12. Earlier work retained: redundant resolve barriers, covered clears, read-only depth draws, descriptor and pipeline lookups, shadow bookkeeping.

Image quality

13. SMAA in SGSR2 Quality: edges are smoothed on the render-size image before the upscale; no extra sharpening pass. Scene textures keep output-resolution detail (mip bias).
14. Shadows with SGSR2/TAA: no grid of blocks in shadowed areas. Every shadow-projection shader that rebuilds its receiver gets the jitter correction; any other stays unjittered.
15. Dynamic shadows on Low keep 16 casters on Android instead of 8 (×2): NPC shadows no longer disappear.
16. SSAO no longer draws stripes on the sky and distant terrain.
17. Qualcomm SGSR1 spatial upscaling in the Vulkan SDR presentation path; it stays enabled after a swapchain format change, and the overlay shows whether it is active and its sizes. Checked pixel by pixel against Qualcomm's algorithm: maximum error 2/255.
18. 576p and 900p render resolutions; full-screen 2D layers cover the whole width on displays wider than 16:9; the title screen's mesh pattern is no longer drawn.

Audio

19. XMA error bursts removed: a voice whose frames keep failing resynchronises on the next packet and then plays silence instead of retrying thousands of times a second. → from 12–14 thousand errors in about a second to 56–150 in a whole session.
20. XMA decoder on performance cores at audio priority; it no longer holds its lock for a whole voice.
21. No AAudio reopen on every return from the background; queue-reserve recovery and stall protection. → audio queue empty 0 times in the measured sessions (74–91 before).
22. 64 ms audio buffer on Android.

CPU and build

23. The Android runtime is built for ARMv8.2-A (inline LSE atomics; Snapdragon 845 and later). No separate gain is claimed.

Android, TV and extras

24. TV / HDMI: independent external output, 16:9 fitting, 720p/1080p requests, controller forwarding; phone blackout returns 10 s after the last touch.
25. MediaCodec H.264 replacement movies, with the original video on failure.
26. EXP ×2 and SP ×2 quick-tool switches (LB+RB → Cheats → Quick tools).
27. Graphics preset Mobile 30 FPS (1080 internal, SGSR1, low shadows).
28. Cleaner settings: the development A/B rows are removed and the confirmed behaviour is built in.
29. New launcher icon; the edition is named on the title screen above the upstream credit.

Diagnostics (Tester)

30. Bounded recordings with ZIP export: frame, CPU, thread, GPU, thermal and memory samples; per-render-pass GPU profile; GPU time by draw type and most expensive shaders; attachment load/store census; why render passes end; a breakdown of every frame over 50 ms. tools/android/compare-tester.py compares two recordings.

Known limits

• GPU occupancy in gameplay is unchanged at about 60–65% at 30 FPS; 60 FPS at these settings is not reached yet.
• Some light effects look blocky at high resolution: the game draws them into small buffers.
• Some slow frames remain at scene changes and in the city (about 6–10 a minute).
• Tested on one device; HDMI/audio routing and A/V synchronisation on other devices are not verified.

Installation and verification

Android 8.0+, ARM64, Vulkan. Package io.github.freefrank.lostodyssey.steprant, launcher Lost Odyssey Steprant, signing certificate SHA-256 ecaadcdc715ff7e4aeaaf265ec11f1854d4039175dbc7e53fd4f86fd03af6f3f. It coexists with the official app; saves and settings are separate. CI checks: native ARM64 build, JVM tests, lint, APK Signature Scheme v2, alignment, host regression tests and Vulkan (lavapipe) readbacks.

Credits and game data

Thanks to Frank / freefrank and the original community for Lost Odyssey Recomp. This is an unofficial Android fork. The runtime remains GPL-3.0; dependencies keep their notices, including Qualcomm SGSR (BSD-3-Clause) and Intel XeGTAO (MIT). Supply supported game data from your own discs; no game data is included.

APK SHA-256: 44dc2632220945e33926102ca92069f7239ddd57e6c8bd96a83c1cb177497de9 (LostOdyssey-Steprant-v1.8-20261108.apk, built from commit 6b5fe4873dc03ca703a947477d8c32287ce0d3b2)