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Add RGB bpp link

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ABelliqueux 2021-07-24 11:47:31 +02:00
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TIM/README.md
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Standard bitmap images that can be transferred directly to the PSX VRAM.
Can be 4bit or 8bit with a CLUT, 16bit or 24 bit in direct color.
Can be 4bit or 8bit with a CLUT, 16bit or 24 bit in direct color.
See [this page](https://www.fourcc.org/pixel-format/rgb-bi_rgb/) for further information on how information is stored in the different modes.
You can access the TIM mode through TIM_IMAGE->mode.
Mode can be :
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# Transparency
In 16bpp mode, only 15b are used for colors (R 5, G 5, B 5). The 15th bit is defined as the STP or Semi-Transparency flag.
A primitive transparency is set with `SetSemiTrans()`. The only case where a primitive with unset (=0) STP is transparent is when all values are 0.
i.e ; using STP 0, B 0, G 0, R 0 will result in a transparent pixel wether the primitive is set to semi-tranparent or not.
A primitive transparency is set with `SetSemiTrans()`.
The only case where a primitive with unset (=0) STP is transparent is when all values are 0. i.e ; using STP 0, B 0, G 0, R 0
will result in a transparent pixel wether the primitive is set to semi-tranparent or not.
Here are the transparency modes for various values on semi-transparent and opaque primitives :
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| Semi-transparent primitive | Transparent | Semi-transparent | Non-transparent black | Semi-transparent |
See [FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/FileFormat47.pdf), p.56, p.192,
[FileFormat47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/LibOver47.pdf), p.107
[LibOver47.pdf](http://psx.arthus.net/sdk/Psy-Q/DOCS/LibOver47.pdf), p.107
## img2tim semi-transparency options