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* Rename scoped variables without being redundantMiquel Sabaté Solà2026-03-063-179/+179
| | | | | | | Some variables had the same name of the scope in their names as well. Remove this redundancy everywhere. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Check for enemy death after its movementMiquel Sabaté Solà2026-03-061-0/+9
| | | | | | | | | Some enemies might die right after moving (e.g. asteroids exploding into the ground). In these cases, there's no point on checking for player collision. Moreover, this also avoids the corner case of having two explosions on a single death. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Toggle a "Paused" message on top of the screenMiquel Sabaté Solà2026-03-062-2/+63
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Don't toggle pause from a holded buttonMiquel Sabaté Solà2026-03-061-2/+7
| | | | | | | | | | | If you just holded the Select or Start buttons, it would be forever toggling pause/unpause, which is an unexpected behavior. Fix this by saving which value from the joypad was previously read. With this, whenever the pause timer reaches zero, we can check whether either button is still pressed, and avoid toggling if that is the case. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Small savings on re-using untouched registersMiquel Sabaté Solà2026-03-061-8/+2
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Improve documentation on Enemies::zp_current_tilesMiquel Sabaté Solà2026-03-061-10/+17
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Fix a cycling bug when shooting carelesslyMiquel Sabaté Solà2026-03-061-0/+13
| | | | | | | | | | | | | | | | When shooting like crazy and killing random enemies, after a while a cycling bug would appear which would make enemies to turn in weird directions, die unexpectedly, and other weird shenanigans. This comes back to commit 7c493ba3f338 ("Improve a bit the performance on enemy death"), which removed the saving/restoring of the value on the 'y' register. That being said, this register was actually being needed at least by Bullets::update(), so in certain situations this register might have a bad value (e.g. via the Explosions::create() call). Fixes: 7c493ba3f338 ("Improve a bit the performance on enemy death") Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Remove the pool size from enemiesMiquel Sabaté Solà2026-03-051-13/+0
| | | | | | It was never read anyways, so let's drop it. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Exchange the colors on the second foreground paletteMiquel Sabaté Solà2026-03-051-1/+1
| | | | | | This allows enemies to be even more varied when it comes to the color. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Make enemies more colorfulMiquel Sabaté Solà2026-03-051-10/+40
| | | | | | | Each enemy also has its own palette upon creation. This way we add more variety as it was on the original game. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Improve a bit the performance on enemy deathMiquel Sabaté Solà2026-03-051-8/+2
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Don't be too tight on the player's feet for collisionMiquel Sabaté Solà2026-03-051-3/+6
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Make randomness a bit more randomMiquel Sabaté Solà2026-03-052-19/+19
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Add the Game Over screenMiquel Sabaté Solà2026-03-054-15/+244
| | | | | | | This is still missing the support for player 2, but I've left traces about it. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Update lifes left for player 1Miquel Sabaté Solà2026-03-044-2/+52
| | | | | | | The whole handling of player 2 will come whenever I set to implement multi-player for this game. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Add collision with the playerMiquel Sabaté Solà2026-03-044-15/+228
| | | | | | | This allows for explosions to run after making the player to disappear, and it re-runs the entering scene timer. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Let enemies die whenever they touch a bulletMiquel Sabaté Solà2026-03-033-18/+128
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Add a pool of explosion effectsMiquel Sabaté Solà2026-03-034-3/+279
| | | | | | | For now this only applies to enemies, but it's general enough so it can target any given coordinate, and hence any given object. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Allow enemies to revive after a given timeMiquel Sabaté Solà2026-03-031-18/+32
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Move enemy initialization into its own functionMiquel Sabaté Solà2026-03-021-3/+16
| | | | | | This will be useful whenever we implement the re-appearance of enemies. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Wrap around the saving of the last allocated bulletMiquel Sabaté Solà2026-03-021-1/+6
| | | | | | | | | | If we don't do this, then it's possible to incur into a buffer overflow as the last allocated index is set to the next (out of buffer) position. Whenever we start over on this function, then it will compare for a good bullet on this position, and if it's not exactly $FF, then it will allocate it without problems. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Small optimization on bullet initializationMiquel Sabaté Solà2026-03-021-3/+2
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Implement de 'chase' algorithmMiquel Sabaté Solà2026-03-021-36/+246
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Improve some comments in enemies.sMiquel Sabaté Solà2026-03-021-4/+4
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Check for all corners on the 'basic' algorithmMiquel Sabaté Solà2026-03-011-17/+25
| | | | | | | | | | There were still some gaps where the check was failing, and trying to be smart about it was going the "it's too complex for what I need here" route. Hence, just go to the good old dumb algorithm of "check all corners". For now the performance has not dropped, so let's hope that we don't have to re-visit this one. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Fix bottom collision for fighter jet 1sMiquel Sabaté Solà2026-03-011-2/+9
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Finish up the 'homing' algorithmMiquel Sabaté Solà2026-03-011-15/+21
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Allow the 'basic' algorithm to go up or downMiquel Sabaté Solà2026-03-011-5/+12
| | | | | | This is in preparation to the 'homing' algorithm to re-use this one. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Remove the usage to zp_enemy_arg in most placesMiquel Sabaté Solà2026-02-281-73/+30
| | | | | | | | | | | | | | Everywhere except the 'basic' algorithm don't really need this argument. In the beginning I was using it to define some custom velocities, but in the end tweaking the inner timer on the 'extra' value for all enemies turned out to be more productive. Hence, remove this usage almost everywhere and make the code simpler as a side-effect. The usage on 'basic' is still under revision, just to check if 'homing' really needs to set a special argument whenever the 'homing' attack needs this sort of behavior. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Move the 'extra' initialization to a functionMiquel Sabaté Solà2026-02-281-51/+53
| | | | | | | | This allows us to be able to initialize each enemy separately, giving a more random appearance to it all. This will also come in handy whenever we want to make enemies re-appear. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Make 'basic' more true to the original gameMiquel Sabaté Solà2026-02-271-22/+44
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Initial implementation for the homing algorithmMiquel Sabaté Solà2026-02-271-2/+119
| | | | | | | Not the whole thing has been implemented, as it needs a rebump on the 'basic' algorithm so I can re-use it for 'homing' as well. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Update values on the RNG tableMiquel Sabaté Solà2026-02-131-16/+16
| | | | | | | This way enemies are a bit more off from the boundaries, avoiding visually distracting scenarios. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Set the enemy pool size on 'init_pool' loop's initMiquel Sabaté Solà2026-02-131-4/+3
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Implement the 'erratic' algorithm for enemiesMiquel Sabaté Solà2026-02-131-4/+173
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Remove vector.sMiquel Sabaté Solà2026-02-132-70/+66
| | | | | | | | | | | | | | | | | Instead of this, the 'reset' function can go into 'jetpac.s', as we could consider it's part of the 'main' work. As a bonus, doing this alignment gives us 3 bytes back from ROM space. Not that we care too much about space, but it's amusing nonetheless. The debug scope has been moved into its own file in include/. Admittedly it's not the most crucial file in the project, but it makes things more logical and it opens the door to more debugging utilities. This leaves us with a vector.s file only containing interrupt code. Thus, it just makes sense to rename it to interrupts.s, which in the end makes things more organized. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Fix sprites and waves for fighter jetsMiquel Sabaté Solà2026-02-121-6/+6
| | | | | | | I apparently got them all messed up. Let's put them as they were originally. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Implement the 'bounce' algorithm for enemiesMiquel Sabaté Solà2026-02-121-7/+202
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Initial iteration of enemy movementMiquel Sabaté Solà2026-02-123-39/+321
| | | | | | | For now only the basic algorithm has been written, but the framework for adding the rest has also been written down. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Replace some todo's with the safe __fallthrough__Miquel Sabaté Solà2026-02-112-4/+2
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* bin: improve the style and add more documentationMiquel Sabaté Solà2026-02-111-0/+2
| | | | | | And also run rubocop on the CI for good measure. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Remove target velocities from the playerMiquel Sabaté Solà2026-02-101-4/+0
| | | | | | This was mostly from an old implementation and no longer relevant. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Improve the "other" states from fighter jetsMiquel Sabaté Solà2026-02-101-4/+4
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Simplify the random_valid_y_coordinate functionMiquel Sabaté Solà2026-02-102-38/+24
| | | | | | | | | | | | | | | | | | | | | | | | | This function relies on a pre-computed table to get the "random" numbers from, but most of the times this is used, it needs to be between some safe boundaries. Before this commit, this was done inside of the function, correcting the fetched value to be above or below these limits. But there was a bug on the below the grounds limit, in which the 'sbc' instruction could subtract too much from the fetched value and make enemies appear below the sky. Now, this is easy to correct, but since we are cheating with a pre-computed table, I thought it would be vastly easier to just get a random table with the "proper" values. That is, random but within the required boundaries already. Plus, it makes the 'random_valid_y_coordinate' function much faster. This commit adds a ruby script in bin/ which produces a pseudo-random table when called, making sure all the requirements are met. We have to make sure to call this script if we ever change the boundaries at some point. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Simplify allocation for the rest of bulletsMiquel Sabaté Solà2026-02-101-6/+10
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Allocate all enemies on sprite cyclingMiquel Sabaté Solà2026-02-102-3/+42
| | | | | | | The previous commit only tackled the first enemy, this one handles the "rest_o_enemies" code flow, which was entirely missing. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* enemies: add inner movement and facing logicMiquel Sabaté Solà2026-02-102-26/+237
| | | | | | | | | Enemies now have the ability to be displayed on screen, face at the direction that they were assigned to at random during initialization time, and they also have a timer that dictates some inner movement, similarly as it happened in the original game. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Use constants on asan:reserveMiquel Sabaté Solà2026-02-091-1/+1
| | | | Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* Add the __fallthrough__ pseudo-instructionMiquel Sabaté Solà2026-02-031-2/+1
| | | | | | | | The 'nasm' assembler now implements this, which is quite convenient. Define also a fake macro for it when the assembler is not 'nasm' just to bridge the gaps. Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
* 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>