dfcf6a66b6
Turns out I only have fixed the "magically appearing mushroom" bug. I fixed it for slow moving centipedes coming on screen but there was a second case of the same problem for fast moving centipedes. So fix that now also. Bump the version number to 1.0.1. I will do a patch update at some point but I don't think this bug deserves pushing out a quick release update. It is an annoying minor bug at most.
2021-03-03 22:20:22 -05:00
23b37d095b
Fix the mysterious appearing mushroom bug.
2021-01-26 00:25:35 -05:00
384a9ea233
Make more globals per player and index into them with the player number at game time.
2021-01-10 23:17:05 -05:00
3f0578d142
Fix the crashing bug when the previous game ends with the player colliding with the last remaining segment.
2020-12-26 00:31:54 -05:00
dbbdd156e3
Fix the bug where the tiles on the RHS may be marked dirty and accumulate garbage if the player dies on the RHS. Add some more debug for the crashing bug I am chasing. It looks like more than 12 segments have been added so I am adding debug to detect when the number of segments exceeds 12.
2020-12-25 23:59:09 -05:00
b432cf654b
Implement stereo sound. Sounds now come from the left or the right speaker depending on where the sound is coming from on the screen as much as possible.
2020-12-22 23:40:21 -05:00
763ce0626e
Fix problem on real HW where the player will start the next level shooting if they died while shooting, regardless of the state of the mouse. It now ignores the first poll of the mouse at the start of a level to avoid stale poll information. Add some debug in the code for jumping to the head and body segment draw routines to confirm that the table offsets are sane. I have seen a crash which indicates that sometimes the offset is incorrect.
2020-12-16 12:51:37 -05:00
d201f80c3b
Move the sound code into a gameSound.s file. This is the first step towards going around the sound toolset for playing sounds.
2020-12-16 12:00:56 -05:00
0136579125
Disassociate sound resources from the generators they are connected with. Use multiple generators to play multiple shot sounds at the same time. It sounds weird but it kind of works.
2020-12-10 21:55:13 -05:00
bae931aaa6
Add sounds for shooting, killing bugs, dying and resetting mushrooms after death. The shoot sound isn't great because it doesn't restart when rapid fire is happening but this is a start.
2020-12-10 00:45:48 -05:00
1650e8e040
Fix bug where slow head segments would not detect collisions with other segments and change direction.
2020-12-04 00:32:42 -05:00
7368281d58
Fix a long standing bug I have ignored for too long. When adding centipede segments on the left or right, if there was a mushroom right where the segment was arriving, it would try to change direction even though it was still mostly off-screen. This lead to some very strange segment tracks that should never happen. I have added code to ignore blocking mushrooms and not change direction when the segment is partially off-screen.
2020-12-02 23:51:06 -05:00
868f4a3199
Fix a crash that would happen if the last centipede segment collided with the player. Both level and player code was trying to start the next level and the corrupted things badly. Now, the level code is always responsible for starting the next level. The player code only restarts a level when the player dies and doesn't finish the level.
2020-11-19 23:45:23 -05:00
fd40c12d31
Explode a bug when it crashes into the player. When the last segment collides with the player, go onto the next level.
2020-11-18 23:36:01 -05:00
520aaa5a34
Add collision detection for all of the bug types. Remove the debug code for shooting bugs. It is almost a functional game now!
2020-11-17 22:53:30 -05:00
2abb57b1a5
Add the code for detecting player collisions, exploding the player, decrementing the number of lives and maybe ending the game.
2020-11-11 23:51:09 -05:00
bb66ef4b03
Replace the C code which built tables at game launch time with a script which generates these tables at build time. This reduces the start time of the application and saves code space and is a necessary step before adding some new tables to handle the mouse efficiently.
2020-11-04 22:48:18 -05:00
0dd8222611
Add the code to handle restricting the spider to lower and lower rows as the score goes up. This is the final bit of game logic necessary for the bugs in the game I think.
2020-10-26 22:32:46 -04:00
96a6b6f51f
Implement the code to add the flea at the right time. This includes tracking the score in multiples of 20,000 and adjusting the number of mushrooms required in the infield before a flea will appear. Simplify the other score based thresholds which are based on multiples of 20,000 to use this test. Add debug which allows me to add 20,000 to the score whenever I want so I can test these thresholds more easily.
2020-10-25 23:11:11 -04:00
1d4f783a3e
Change the code for centipede speed to skip slow speed segments entirely once the score is more than 40000.
...
Add segments at the start of the next level in reverse order so the single head segments are added first. This ensures they do collision detection properly in the updateSegment code.
Fix a bug where a set of 16 tiles were always marked as occupied by a centipede segment because we didn't clear it properly on each updateSegment call. This fixed a problem with segments changing direction for no apparent reason.
Test for collisions on the two tiles the segment is spanning and change direction if either is occupied. This should eliminate single segments travelling on top of each other.
Add scorpions randomly during a game once we get to level 4. They are added with a 1 in 512 chance every 60 seconds so you should see a scorpion about once every 10 seconds or so.
When the score is above 20000, add scorpions at fast speed 3/4 of the time, slow speed the other 1/4 of the time. Lower scores, the scorpion is always slow.
2020-10-23 00:20:18 -04:00
1f26b38784
Fix the order of colours for the different levels. Remove the debug code to add centipedes and change the colour palette. This is gone now because we now have the concept of starting a game and progressing through levels with different kinds of centipedes running at different speeds with different palette colours.
2020-10-20 23:13:46 -04:00
6c3b8398a8
Add the code to start a game and iterate through levels. We don't detect the end of a level yet though.
2020-10-19 23:34:08 -04:00
04d2e74f15
Add the data about the different levels from a centipede segment perspective.
2020-10-17 16:36:12 -04:00
a1b4013e1c
Hook up the score. Shooting fleas, spiders, scorpions or segments will increase the score. We track the score in two ways. One is just as a 32-bit unsigned integer for doing numeric comparisons on the score (say to the high score list to be implemented in the future) and secondly as a series of numeric digits displayed in a tile. Both are updated.
2020-10-13 23:24:15 -04:00
b85000b4ed
Start adding the infrastructure for levels and score.
2020-10-13 00:09:37 -04:00
a7d1db68e2
Add the code to add head segments once the centipede reaches the bottom of the screen.
2020-10-08 23:59:34 -04:00
6969da19b9
Add code to accelerate to fast speed if the last segment.
2020-10-02 14:57:38 -04:00
eb418fb1c4
Add the ability to shoot centipede segments.
2020-10-02 14:50:14 -04:00
74a21db9e0
Change the starting position so we get a collision right away.
2020-09-24 23:19:43 -04:00
766eaf6273
Add the code to detect segment collisions and change direction if a head is colliding with another head or body segment.
2020-09-24 23:17:39 -04:00
a9f62257f9
Reverse the order in which segments are added in memory and add some data for tracking the tiles occupied by segments. This will allow for segment collision detection next.
2020-09-23 23:04:05 -04:00
69efb23800
Some minor optimization to the update code and check for a mushroom in the tile we are moving into and the next tile when we need to decide to change direction. This better reproduces the real game's behaviour.
2020-09-23 22:42:02 -04:00
1dfbe8156a
Add support for having both fast and slow centipedes in play at the same time.
2020-09-21 22:57:06 -04:00
a9d3b12725
Add code to poison a centipede.
2020-09-13 16:08:32 -04:00
03466f8847
Add code to allow a centipede and all its body segments to scroll in at the top of the screen at slow speed. Need to do the same for fast speed.
2020-09-13 15:18:18 -04:00
f99ff8e816
Add all the code to handle double speed centipede segments.
2020-09-13 14:54:18 -04:00
dc5ab4720d
Fix bugs that cause the centipede segment to drop as if poisoned when it reaches the bottom half of the screen.
2020-09-13 13:32:25 -04:00
ab5f5c6299
Fix bug in code that looks for the edge of the screen which was comparing by tile number, not tile offset.
2020-09-11 00:25:41 -04:00
46567659e9
Add the code to animate the segments at slow speed. There is a bug where the centipede seems to get stuck along the left edge sometimes. But overall looks pretty good.
2020-09-11 00:01:30 -04:00
0362b53e2c
The head segment is now animating to the right. But it needs better support for segment speed and it needs to change direction when it reaches an obstacle. And all of the other directions to write still.
2020-09-09 23:53:51 -04:00
0d4677c397
More work towards the animation of centipede segments.
2020-09-08 23:54:44 -04:00
36617cbf9d
Lay some more groundwork for animating centipede segments. We now have an array of 96 (97 actually) entries which describe the position of the segment now or in the past. By keeping past information, body segments which follow head segments will take no calculation to update. We just have to animate head segments and body segments will follow them 8 pixels behind automatically.
2020-09-07 22:35:32 -04:00
3b541f8482
Fix bug leading to crash when trying to add centipede body segments. I needed to have a nop instruction after the self-modifying long jump. I am writing 4 bytes of the address into the long jump which only uses a 3 byte address and I was corrupting the next instruction. Inserting a nop ensures no corruption happens.
2020-09-06 13:39:00 -04:00
f5d1aa9ee6
Improve the performance of the centipede segment draw function.
2020-09-06 02:05:33 -04:00
92c02ded0f
Simplify the handling of the dirty tiles to just store the dirty word and not keep the array of dirty tile offsets. Have the flea use game and non-game dirty tiles to fix the problem with LHS tiles being marked dirty all the time.
2020-09-04 01:55:38 -04:00
22a22d3533
Change the code to race the beam down the screen, redrawing the dirty game rows as it goes.
2020-09-04 00:17:19 -04:00
b07221c363
Change from an array of structs to a series of individual arrays for the tile information. This makes it easier to index into the arrays because the tile number * 2 is the offset, rather than tile number * 16.
2020-09-02 00:15:53 -04:00
df56cdecf1
Add the ability to display head segments of the centipede. Body segments is not working yet.
2020-08-27 23:36:16 -04:00
3a63b2ef1b
Add code to support marking dirty tiles under head and body segments.
2020-08-27 22:36:04 -04:00
d8e9c6863b
Add the code to draw the body and head segments in the game loop. Still need to add code to create, update and shoot segments.
2020-08-26 23:44:41 -04:00
Jeremy Rand