Textures, sound, music, movies, text

Textures

Format	Where	Notes
TGA, image type 2 (uncompressed true colour), 24 or 32 bpp	Non-C archives, car sets c-f, loose FrontEnd/exittexture.tga	Standard Truevision header (18 bytes), no colour map, no RLE seen. Fonts are 256x128 32-bit atlases
DDS, DXT5	C archives, car sets a, all track textures, Game/Bigfiles/common.bfl effects	Standard DirectDraw surface header (DDS , 124-byte DDSURFACEDESC2), FourCC DXT5. The header sets DDSD_MIPMAPCOUNT but the count is 1 in every file checked: no mip chain on disc

No other texture format appears. Tex_Reload 0x4a5da0 ("couldn't find texture: %s") finds the member (bfl.md) and picks the loader by the DDS magic:

• Tex_LoadTga 0x4a6710 validates with Tga_Header 0x4a6670: colour-map type 0, image type 2, x and y origin 0, descriptor bits 4-6 clear (so rows bottom-up, left to right: a top-down TGA is refused), 24 bits, or 32 bits with 8 alpha bits. The colour-map fields are not looked at. The pixels follow the 18-byte header and the image ID. Tga_Pixel 0x4a60d0 reads pixel (x, y) from row height-1-y as B, G, R(, A) and optionally applies a brightness offset and a colour matrix (the texture-adjust options); the loader converts it into the surface's pixel format (masks and shifts from the surface description), 16 or 32 bits depending on the mode ("Set windows desktop to 16 bit" warns in window mode).
• Tex_LoadDds 0x4a6e30 passes the 124-byte surface description after the magic to CreateSurface as it is and copies the data from 0x80 into the surface; FourCC DXT1 and DXT5 are recognised. A width or height that is not a power of two from 2 to 2048 only makes it note the name.
• Name suffixes and prefixes (DIGIT, REVCT and two-letter tags) set texture flags for the renderer.

All 7,804 DDS and 4,003 TGA members of the disc pass these checks. The game also has a texture-adjust dialog ("Alter texture characteristics": brightness, contrast, saturation) in its debug resources.

Port (src/image.c): both decoded on the CPU into RGBA8, rows top first (deterministic, works on every GLES 3 / WebGL 2 device); the surface format and the adjust options are the renderer's. DXT colours are the end points widened by bit replication and the 1/3, 2/3 mixes truncated; DXT5 alpha the 6- or 4-value ramp. An S3TC upload path can come later as an option.

Sound effects and speech

RIFF WAVE, format tag 1 (PCM), mono, 16-bit:

Set	Rate	Count
Speech (pace notes, CountrySpecific)	11,025 Hz	295
Front-end and menu sounds	22,050 Hz	25
In-game sounds (Game/Bigfiles/common.bfl)	11,025 / 22,050 / 44,100 Hz	44
Surface sounds (Sounds/surface.bfl)	22,050 Hz
Engine sets (Sounds/Car)	22,050 / 32,000 Hz	240

Snd_Load 0x4a1f50 checks WAVE at +8 and then reads the canonical 44-byte header at fixed offsets (channels +0x16, rate +0x18, bits +0x22, data size +0x28, data at +0x2c) without walking the chunks; every WAV on the disc has that header. It never looks at the member's size: the five cut.wav members of the speech archives are empty and sit at the offset of ditch.wav, so they would play "ditch", but no pace note asks for cut (the exe's speech list has no CUT). Loaded sounds are counted up to 200 (Snd_LoadNamed 0x4b76c0).

The original plays them through DirectSound with optional DirectSound3D (the options list "DSound3D Hardware", "Software - HRTF Full", "HRTF Light", "Pan and Volume"). Engine sounds are pitched loops.

Music (.adp)

Sounds/Music/arcade1..8.adp and select1.adp, select3.adp: RIFF WAVE with format tag 2 (Microsoft ADPCM), stereo, 44,100 Hz, 4 bits per sample, block align 2,048, the standard 7 coefficient pairs in the fmt extension, and a fact chunk. 8-14 MB each, not compressed further. Music_Open 0x4a28d0 opens the file, converts it with the ACM (Msadp32.acm) into a DirectSound streaming buffer and Music_Update 0x4a2bd0 refills it. Port: a small MS ADPCM decoder streaming through the file layer.

Movies (.bik)

FrontEnd/Videos/intro.bik (21 MB) and cm.bik (5 MB, the Codemasters logo): Bink video, signature BIKi (Bink 1, revision i), 640x480, played through binkw32.dll (BinkOpen, BinkDoFrame, BinkCopyToBuffer, BinkOpenDirectSound). The port needs its own Bink 1 decoder (video DCT/RLE bundles and the Bink audio DCT/RDFT codec), written from the published format descriptions. Until then movies are skipped, which the original allows (any key).

Text

<language>text.bfl holds three files, one string per CRLF line, Latin-1, no header:

File	Used by	Strings
f<language>.txt	Front end (FUN_004f4b90)	533 (0x215)
s<language>.txt	Stage, service and results screens (FUN_0050f240)	326 (0x146)
g<language>.txt	In-game HUD and messages (FUN_00478a20)	260 (0x104)

There is one string table at a time. Text_Build 0x4a3c90 takes N files (the front end loads one per language it offers) of a fixed number of strings, cutting them in place with Text_Next 0x4a3d50: a string ends at the first byte below 0x20 (which becomes NUL) and the next starts at the next byte of 0x20 or more, so empty lines are skipped, not counted. There is no end test: a file with fewer strings would run on into whatever follows it in memory. Text_Select 0x4a3c30 picks the file, Text_Get 0x4a3c60 returns string i of it or INVALID TEXT STRING out of range, Text_Free 0x4a3d80 drops the table. Port: src/text.c (on copies of the files).

Languages on this disc (CountrySpecific/Europe): English, French, German, Italian, Spanish. The exe also knows EngUSA, FrenchUSA, Polish (other releases). Text_ToFontCase 0x4a9f90 upper-cases a string and maps a few Latin-1 symbols (£, ©, ®, ±, ½, ¼, ¾, ×, ó) onto the font's glyph slots.

CMR2.0 help.chm and ReadMe.txt (installed from data1.cab) are documentation, not used by the game; Game/Info/Osdinfo.dat (14,868 bytes, from data1.cab) is not named in the exe's strings; whether and how it is used is open.

Fonts (.pcf + .tga)

Each font is a pair <name>.pcf + <name>.tga (or .dds in the C archives) in the same archive (hel_12pt, hel_13pt, hel_15pt, hel_20pt, hel_36pt, lcd_14pt, lcd_640, ocr_12pt, ocr_60pt, dot, debug, handel), found by Font_Load 0x40b4f0 ("%s\%s.pcf") and installed into a font slot (0x18 bytes each, table at DAT_0053223c) by Font_Set 0x40b350.

Offset	Type	Field
0x00	u32	3
0x04	u32	glyph count (hel_12pt: 174)
0x08	u32	line height
0x0c	u32	space width
0x10	u32	tracking, added after every glyph
0x14	u32	0
0x18	u16[256]	glyph index per character, 0xffff none
0x218	16 bytes each	glyphs: u16 x, y, width, height in the atlas; u8 character; u8 kerning pair count; u16 unused; u32 file offset of the kerning pairs (relocated by Font_Set)
after	4 bytes each	kerning pairs: u8 next character, u8 unused, i16 adjustment, ascending

Font_TextWidth 0x40b5b0 measures a string: a space adds the space width; a glyph adds its width and the tracking, or the pair's adjustment plus the tracking when the next character has a glyph and a pair (the pairs are searched up to the first one not below the next character); characters without a glyph add nothing. It stops at the first \n or ^, so it returns the first line's width, in 16-bit arithmetic.

Font_Print 0x40b880 lays a string out. Flags 4 and 2 right-align and centre each line; 0x10 and 0x20 raise the baseline by the first glyph's byte +0x0a and by the height. A space adds the space width, and \n or ^ starts a line one height plus the line gap (+0x14) lower. A glyph adds its width, the tracking and its kerning pair. Font_TextHeight 0x40b730 is the line count times the height plus one, minus one, plus the gap. The fonts live in slots (Font_InitSlots 0x40b220; Font_LoadSlot 0x40b430 finds <name>.tga as a texture and <name>.pcf beside it).

One record is garbage: in Game/Bigfiles/com1024.bfl and com1024C.bfl, hel_20pt maps Í (0xcd) to a glyph that is all 0xcd bytes (uninitialised memory in the font tool), kerning offset included; the original would read far past the file when measuring Í before another glyph. The port gives that glyph no kerning (src/font.c). All 72 fonts' other glyphs lie inside their atlases.

Front-end stage files (.dmd)

FrontEnd/common.bfl has one 324-byte <stage>.dmd per stage (jap11.dmd, aus02.dmd, ...; cha%.2d.dmd for challenges), read by 0x4d5ca0 for the stage-select "diamond" screen. Layout open.