Soft3D engine archaeology

• Engine written in C++, at least some builds include RTTI

File formats overview

	File extension	Platform(s)	Notes & open questions
✔️	SPK	Chinese and English variants	resource archives; 64-byte and 32-byte path layouts documented in Reverse_Docs/filepak_api.md
🔧	S3DTEX		S2D images/textures; observed grayscale8/RGB565 decoding and remaining header/engine-loader questions documented in Reverse_Docs/s3dtex_format.md
🔧	S3DSTY		BSP lightmap-frame animation sequences; 256-record layout and loader documented in Reverse_Docs/s3dsty_format.md; runtime timing/modulation remains under reconstruction
🔧	SAI		3D model animations, mostly understood Fixed-point transform tracks, bounds, morph targets, timing, and interpolation documented in Reverse_Docs/soft3d_models_animations.md
✔️	SAU	DA320 (all), GA330, S60v1 (chi), S60v2, S60v3, Win32 (chi)	AMI ADPCM audio, low nibble first; same format as WAR except nibble order, well-understood
🔧	SBN	GA330, S60v3	font (glyphs) + text data (32-bit encoding); Symbian base/local glyphs, string tables, character lookup, and drawing documented in Reverse_Docs/sbn_format.md
🔧	SBN	Win32	font (glyphs) + text data (7-bit encoding), mostly understood
🔧	SBP	GA330	maps, based on Quake 2 map format, mostly understood Actual chunk order, serialized records, incremental loader, and remaining visibility/lightmap work documented in Reverse_Docs/sbp_format.md
🔧	SDT	S60v3	Various data tables; UI string/resource and dialog-state formats documented in Reverse_Docs/sdt_format.md; other SDT families remain unconfirmed
🔧	SPL		Counted Bezier camera-path records; container/layout and remaining evaluation work documented in Reverse_Docs/spl_format.md
🔧	SOJ		3D objects, mostly understood Materials, packed texture names, vertex streams, primitive modes, bounds, and skinning links documented in Reverse_Docs/soft3d_models_animations.md Some material and renderer-state fields remain unidentified
🔧	SST		“simple script”, mostly understood
✔️	STX		images/textures (RGB444), well-understood
✔️	STX		images/textures (RGB565), well-understood
✔️	WAR	DA320 (old), S60v1 (eng), Win32 (eng)	AMI ADPCM audio, high nibble first; same format as SAU except nibble order, well-understood

Let us know if you have had success parsing files from platforms not listed in the table!

Some links

7 Days

• Table of known versions of the game
• http://legendsworld.net/adventure/game/2455
• http://www.legendsworld.net/phpBB3/viewtopic.php?f=5&t=9745
• https://imgur.com/a/3IMWR7r
• https://sourceforge.net/projects/spkextractor/

Misc

• Domestic "Silent Hill" IMGA award-winning mobile game-"7 Nights", can not afford the award (story of the demise of Dingoo Games, in Chinese)

Games known to use the engine

• 7 Days: Salvation
• 天地道 aka Hellstriker II (ships on GA330)
• 斗地主 (ships on GA330)

Platforms

• Dingoo A320
• Gemei A330
• Symbian S60
• Win32