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* 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>