Sprite Collection

Author(s): Gonhex
Research: PlatinumMaster, Gonhex

This file functionally replaces the NCER, if the render target is provided by the 3D engine of the DS. It uses the NCGR (must contain a line buffer, no tiles!) as texture to create multiple sprites. It is used for battle sprites (Trainer and Pokemon) and in the game intro (professor juniper).

Data Structure
Specification
- Optional Component
TODO

Data Structure

Sprite Container

struct ContainerSprites
{
    /* 0x0    */ uint32_t numberSprites;
    /* 0x4    */ int16_t boundRight;
    /* 0x6    */ int16_t boundBottom;
    /* 0x8    */ int16_t boundLeft;
    /* 0xA    */ int16_t boundTop;
    /* 0xC    */ struct SpritePair body[numberSprites];
    /* append */ uint32_t padding;
}; // entry size = numberSprites * 0x30 + 0x10

Field Name	Description	Data Type
numberSprites	Number of sprites which can be indexed by the NANR.	uint32_t
boundRight	Probably unused.	int16_t
boundBottom	Probably unused.	int16_t
boundLeft	Probably unused.	int16_t
boundTop	Probably unused.	int16_t
body	Contains two sprites which share the same index.	SpritePair[]
padding	Padding.	uint32_t

Sprite Pair

struct SpritePair
{
    /* 0x0  */ struct Sprite bodyPart;
    /* 0x18 */ struct Sprite component;
}; // entry size = 0x30

Field Name	Description	Data Type
bodyPart	One sprite. It is equivalent to a cell from the NCER.	Sprite
component	Usually all values are zeroed out. Only used for game-controlled parts, see Optional Component.	Sprite

Sprite

struct Sprite
{
    /* 0x00 */ fx<1.23.8> spritePositionX;
    /* 0x04 */ fx<1.23.8> spritePositionY;
    /* 0x08 */ struct Size sizePropertiesX;
    /* 0x0C */ struct Size sizePropertiesY;
    /* 0x10 */ fx<1.19.12> texturePositionX;
    /* 0x14 */ fx<1.19.12> texturePositionY;
}; // entry size = 0x18

Field Name	Description	Data Type
spritePositionX	Initial x position. The final position on screen depends on further processing.	`fx<1.23.8>`
spritePositionY	Initial y position. This coordinate is upside down (multiply with -1).	`fx<1.23.8>`
sizePropertiesX	Horizontal sizes.	Size
sizePropertiesY	Vertical sizes.	Size
texturePositionX	Left edge position on the texture image.	`fx<1.19.12>`
texturePositionY	Top edge position on the texture image.	`fx<1.19.12>`

Size

struct Size
{
    /* 0x0 */ uint32_t unknown0 : 12;  // 0b00000000'00000000'00001111'11111111
              uint32_t dimension : 12; // 0b00000000'11111111'11110000'00000000
              uint32_t scaling : 8;    // 0b11111111'00000000'00000000'00000000
}; // entry size = 0x4

Field Name	Description	Data Type
unknown0	Unused?	uint32_t : 12
dimension	Width or height of the sprite's bounding box.	uint32_t : 12
scaling	Effects sprite scaling but not on the shadow, undocumented behavior.	uint32_t : 8

Specification

Optional Component

The 2nd sprite in a pair is only used for subimages, which are controled by the game:

Pokemon eyes: They close their eyes to blink in battles or sleep.
Professor intro: She only moves her mouth while talking (adding letters to the text box).

These actions require the ability to change a specific part of the sprite asynchronously. The 2nd sprite provides this feature. If the game sends a command to display the alternative sprite, it moves the bounding box down by its height.

For the most body parts this isn't needed (not linked to the head). In these cases all entries of the sprite are zero, resulting in a 0 x 0 pixel sized "sprite".

TODO

Document scaling in Size
Link fixed point definition

Table of Contents​

Data Structure​

Sprite Container​

Sprite Pair​

Sprite​

Size​

Specification​

Optional Component​

TODO​

Table of Contents