Sprite Editor

Binary format

Binary File Format

■ File layout

offset	size	Explanation
$ 000	$ 100	Header
$ 100	variable	Palette data
variable	variable	Sprite data
variable	variable	Pattern data

■ Header

offset	size	function
$ 00	$ 10	Identifier = "SEGA_SPRED_01.00" ("_" = $ 20)
$ 10	long	Palette data offset address
$ 14	long	Palette data size (bytes)
$ 20	long	Sprite data offset address
$ 24	long	Sprite data size (bytes)
$ 30	long	Pattern data offset address
$ 34	long	Pattern data size (bytes)
$ 38	$ C8	Dummy data (all $ 00)

■ Palette data

offset	size	function
$ 00	word	Color RAM mode
$ 02	$ 0E	Dummy data (all $ 00)
$ 10	variable	Color code

● Color RAM mode

Mode 0 (0x0000)	16bit x 1024 colors
Mode 1 (0x1000)	16bit X 2048 colors
Mode 2 (0x2000)	32bit x 1024 colors

● Color code

MSB LSB
│ │ B │ G │ R │
┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐
│ * │ 4 │ 3 │ 2 │ 1 │ 0 │ 4 │ 3 │ 2 │ 1 │ 0 │ 4 │ 3 │ 2 │ 1 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘
* Can be set freely (usually 1b)

■ Sprite data

offset	size	function
$ 00	word	Number of registered sprites
$ 02	$ 0E	Dummy data (all $ 00)
$ 10	variable	Sprite header x number of registered sprites
variable	variable	CG data

● Sprite header

offset	size	function
$ 00	word	Sprite H size
$ 02	word	Sprite V size
$ 04	word	Color mode
$ 06	word	Color offset address * 1
$ 08	long	CG data offset address * 2
$ 0C	long	CG data size (bytes) * 3

* 1 Relative address from the beginning of color RAM

* 2 Relative address from the beginning of CG data

* 3 Apply 0x20Byte boundary for each sprite

● CG data

When color mode = 0x0000,0x0001 (4bit / dot)

MSB LSB
│ Even coordinate code │ Odd coordinate code │
┌─┬─┬─┬─┬─┬─┬─┬─┐
│ 3 │ 2 │ 1 │ 0 │ 3 │ 2 │ 1 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┘

When color mode = 0x0002,0x0003,0x0004 (8bit / dot)

MSB LSB
│ Palette code │
┌─┬─┬─┬─┬─┬─┬─┬─┐
│ 7 │ 6 │ 5 │ 4 │ 3 │ 2 │ 1 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┘

When color mode = 0x0005 (16bit / dot)

MSB LSB
│ │ B │ G │ R │
┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐
│ * │ 4 │ 3 │ 2 │ 1 │ 0 │ 4 │ 3 │ 2 │ 1 │ 0 │ 4 │ 3 │ 2 │ 1 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘

* Can be set freely (usually 1b)

■ Pattern data

offset	size	function
$ 00	word	Number of registration patterns
$ 02	$ 0E	Dummy data (all $ 00)
$ 10	variable	Pattern header x number of registered patterns
variable	variable	Sprite placement data

● Pattern header

offset	size	function
$ 00	long	Sprite placement data offset address *
$ 04	word	Number of sprite entries
$ 06	$ 0A	Dummy data (all $ 00)

* Relative address from the beginning of sprite placement data

● Sprite placement data

offset	size	function
$ 00	word	Inversion information
$ 02	word	Dummy data ($ 0000)
$ 04	word	Color mode
$ 06	word	Color RAM offset address
$ 08	word	CG data offset address
$ 0A	word	Sprite size
$ 0C	word	Offset A (H coordinate)
$ 0E	word	Offset A (V coordinate)
$ 10	word	Offset B (H coordinate)
$ 12	word	Offset B (V coordinate)
$ 14	word	Offset C (H coordinate)
$ 16	word	Offset C (V coordinate)
$ 18	word	Offset D (H coordinate)
$ 1A	word	Offset D (V coordinate)
$ 1C	word	Dummy data ($ FFFF)
$ 1E	word	Sprite number

Inversion information

MSB LSB
│ Unused │ Inverted │ Unused │ Unused │
┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┬─┐
│ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ V │ H │ 0 │ 0 │ 0 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴─┘
V: VF = vertical inversion H: HF = horizontal inversion

Color mode

MSB LSB
│ Unused │ Color mode │ │ │
┌─┬─┬─┬─┬─┬─┬─┬─┬─┬─┼──┬──┬──┬─┬─┬─┐
│ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ 0 │ b2 │ b1 │ b0 │ 0 │ 0 │ 0 │
└─┴─┴─┴─┴─┴─┴─┴─┴─┴─┴──┴──┴──┴─┴─┴─┘
b2 b1 b0
0 0 0 Mode 0 16 colors (color bank)
0 0 1 Mode 1 16 colors (look-up table)
0 1 0 Mode 2 64 colors (color bank)
0 1 1 Mode 3 128 colors (color bank)
1 0 0 Mode 4 256 colors (color bank)
1 0 1 Mode 5 32K color (RGB)

Color RAM offset address

MSB LSB
│ Color RAM offset address * / 8H　
┌──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬─┬─┐
│ aD │ aC │ aB │ aA │ a9 │ a8 │ a7 │ a6 │ a5 │ a4 │ a3 │ a2 │ a1 │ a0 │ 0 │ 0 │
└──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴─┴─┘
* Relative address from the beginning of color RAM

CG data offset address

MSB LSB
│ CG data offset address * / 8H　
┌──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬─┬─┐
│ aD │ aC │ aB │ aA │ a9 │ a8 │ a7 │ a6 │ a5 │ a4 │ a3 │ a2 │ a1 │ a0 │ 0 │ 0 │
└──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴─┴─┘
* Relative address from the beginning of CG data

Sprite size

MSB LSB
│ │ H size / 8H │ V size │
┌─┬─┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┬──┐
│ 0 │ 0 │ h5 │ h4 │ h3 │ h2 │ h1 │ h0 │ v7 │ v6 │ v5 │ v4 │ v3 │ v2 │ v1 │ v0 │
└─┴─┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┴──┘

Offsets A to D

The vertices of the relative coordinate values A to D between the pattern origin and each vertex of the sprite correspond to the following positions.

AB
┏━━━━━━┓　
┃ ┃　
┃ ┃　
┃ ┃　
┃ ┃　
┃ ┃　
┗━━━━━━┛　
DC

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