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21 Blue


RevEng

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  • 3 years later...
  • 2 years later...

Yeah, they operate very similar to the Title Screen Kernel - I actually created the TSK from the code in 21 Blue.

 

More or less all of the minikernels here behave similarly. The 2 player objects are set to display 3 copies and are positioned on the screen - spread apart for the cards, and close together for the bitmaps - and then changed as needed, after the beam passes each copy. The timing for those changes varies depending on how far apart the players are. Stella's timing accuracy was a godsend with that.

 

A good chunk of the work was actually writing a PNG parser in C, to convert the girl images to the necessary interleaved byte format. It was very gratifying when it all came together correctly. :)

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