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hello_poly_stp/README.md
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![Hello_stp](https://wiki.arthus.net/assets/hello-stp.png)
# STP : Semi-Transparency usage
This example shows the various way of converting an image with transparency to a TIM and use it in code.
It also shows the effect of activating Semi-Transparency on a primitive textured with those images.
**By default, the PSX will consider black pixels (0,0,0,0) as transparent**.
In order to display those black pixels as black, you have to set the STP on black (1,0,0,0).
Black pixels and non-black pixels with the STP bit will display as semi-transparent when using `SetSemiTrans()`.
Use the `SELECT` button to switch primitive semi-transparency on and off.
It also features a few C struct to facilitate access to the TIM file / pixel data.
You can use Lameguy64's [img2tim](https://github.com/Lameguy64/img2tim) tool to convert most of image formats to the psx [TIM format.](https://github.com/ABelliqueux/nolibgs_hello_worlds/tree/main/TIM).
## Important
**By default, the PSX will consider black pixels (0,0,0,0) as transparent**.
In order to display those black pixels as black, you have to set the STP on black (1,0,0,0).
Black pixels and non-black pixels with the STP bit will display as semi-transparent when using `SetSemiTrans()`.
## STP on black
Use this to display black pixels as black, not transparent.