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Updated asset builder README.md.

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Ulysse Cura 2026-08-15 20:56:53 +02:00
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TODO.md
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- [ ] Change linked list for each implementation to a macro (iykyk)
- [ ] Add compression into asset builder and asset manager.
- [ ] Create camera
- [ ] Make functionnal hitboxes between entities and map

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assets/asset_builder/README.md
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# Asset file structure
# Asset builder description
This program builds assets into an output file.
The supported file formats are :
- image (.png)
- maps (.map which is in reality json)
The different files format are deduced from the extensions only.
The code has some optimisation problems but here is the main idea :
First calculate header wich consists of :
| Description | Length |
| :---------------- | :------------------------------------------------ |
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| Asset name | const char [] (variable length, ends with '\00') |
| Asset start index | unsigned int (32 bits) |
| ... | |
| Asset data | depend on assets content and number |
This calculation needs to analse the content of inputs files to calculate the start offsets in the file.
Then write the content of each file in the same order as they were analysed for header calculations.
For the moment each input file is openend and analized 2 times.
## Image (.png)
Convert RGBA to RGB with #FF00FF as the transparent color.
If alpha null then the color of the pixel will be replaced with this.
Image data is in RGB 565.
Convert png's RGBA8888 to custom RGB565 with #FF00FF (or #F81F in RGB565) as the transparent color.
If png's alpha is null then the color of the pixel will be replaced with this.
### Image asset data structure
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| Image height | unsigned int (32 bits) |
| Image data | depend on image size, pixel short (16 bits) |
## Maps (.map)
Convert from json to custom format.
### Maps asset data structure