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* Increase the upper Y limit for spritesMiquel Sabaté Solà2026-02-031-1/+1
| | | | | | | | Some sprites like enemies and objects are meant to appear maximum at a certain Y coordinate. Increase that as the former could mean sprites going on about the scores, whereas that shouldn't be possible. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Initialize enemies at a random Y coordinateMiquel Sabaté Solà2025-05-161-0/+4
| | | | | | | | | The randomness comes from a pre-computed table of "random" numbers. This is of course the most simple technique you can come across a code base for the NES/Famicom, but for the purposes of this game is good enough and (most importantly) fast. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Don't touch zp_arg2 on background checksMiquel Sabaté Solà2025-05-141-4/+3
| | | | | | | | This was a leftover from a previous implementation and is no longer needed. Moreover, I have also added a comment clarifying that the 'y' register is preserved. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* player: Implement background collisionMiquel Sabaté Solà2025-04-011-0/+73
| | | | | | | This adds a first implementation of collision checks between the player and the background. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>
* Expanded ground collision to the other platformsMiquel Sabaté Solà2025-03-181-0/+28
This comes with a more general approach to handle background collision. Signed-off-by: Miquel Sabaté Solà <mikisabate@gmail.com>