Jeremy Rand
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74a21db9e0
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Change the starting position so we get a collision right away.
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2020-09-24 23:19:43 -04:00 |
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Jeremy Rand
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766eaf6273
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Add the code to detect segment collisions and change direction if a head is colliding with another head or body segment.
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2020-09-24 23:17:39 -04:00 |
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Jeremy Rand
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a9f62257f9
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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.
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2020-09-23 23:04:05 -04:00 |
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Jeremy Rand
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69efb23800
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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.
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2020-09-23 22:42:02 -04:00 |
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Jeremy Rand
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1dfbe8156a
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Add support for having both fast and slow centipedes in play at the same time.
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2020-09-21 22:57:06 -04:00 |
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Jeremy Rand
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c4902f486b
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Add some global data to have a bit mask of tiles which contain a centipede segment. This will allow the update code to figure out if centipede segments are colliding and if so, change direction. Still need to write some codegen for this global constant data rather than building it at runtime in C.
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2020-09-20 22:22:58 -04:00 |
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Jeremy Rand
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a9d3b12725
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Add code to poison a centipede.
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2020-09-13 16:08:32 -04:00 |
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Jeremy Rand
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03466f8847
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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.
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2020-09-13 15:18:18 -04:00 |
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Jeremy Rand
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f99ff8e816
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Add all the code to handle double speed centipede segments.
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2020-09-13 14:54:18 -04:00 |
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Jeremy Rand
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dc5ab4720d
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Fix bugs that cause the centipede segment to drop as if poisoned when it reaches the bottom half of the screen.
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2020-09-13 13:32:25 -04:00 |
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Jeremy Rand
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ab5f5c6299
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Fix bug in code that looks for the edge of the screen which was comparing by tile number, not tile offset.
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2020-09-11 00:25:41 -04:00 |
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Jeremy Rand
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46567659e9
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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.
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2020-09-11 00:01:30 -04:00 |
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Jeremy Rand
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0362b53e2c
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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.
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2020-09-09 23:53:51 -04:00 |
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Jeremy Rand
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0d4677c397
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More work towards the animation of centipede segments.
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2020-09-08 23:54:44 -04:00 |
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Jeremy Rand
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36617cbf9d
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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.
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2020-09-07 22:35:32 -04:00 |
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Jeremy Rand
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3b541f8482
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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.
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2020-09-06 13:39:00 -04:00 |
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Jeremy Rand
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f5d1aa9ee6
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Improve the performance of the centipede segment draw function.
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2020-09-06 02:05:33 -04:00 |
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Jeremy Rand
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07f8df4b4f
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Draw the scorpion once we are sure the beam has past it on the screen for the previous frame. Adjust the wait for VBL look to look for less than scan line 200 rather than scan line 0. That way, we shouldn't get a frame glitch at 2.8MHz any more.
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2020-09-06 01:54:47 -04:00 |
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Jeremy Rand
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92c02ded0f
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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.
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2020-09-04 01:55:38 -04:00 |
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Jeremy Rand
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22a22d3533
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Change the code to race the beam down the screen, redrawing the dirty game rows as it goes.
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2020-09-04 00:17:19 -04:00 |
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Jeremy Rand
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b07221c363
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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.
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2020-09-02 00:15:53 -04:00 |
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Jeremy Rand
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df56cdecf1
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Add the ability to display head segments of the centipede. Body segments is not working yet.
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2020-08-27 23:36:16 -04:00 |
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Jeremy Rand
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3a63b2ef1b
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Add code to support marking dirty tiles under head and body segments.
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2020-08-27 22:36:04 -04:00 |
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Jeremy Rand
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d8e9c6863b
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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.
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2020-08-26 23:44:41 -04:00 |
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Jeremy Rand
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67e2b56dc2
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Add some more code to support adding bug segments to the game.
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2020-08-10 23:58:49 -04:00 |
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Jeremy Rand
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7d7afc908d
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Use macros to reduce the copy/pasted code for marking tiles as dirty. Rough out the support for body and head segments.
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2020-07-30 23:34:48 -04:00 |
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Jeremy Rand
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2b45813cbb
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Increase the chance that a flea produces a mushroom.
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2020-07-28 15:44:55 -04:00 |
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Jeremy Rand
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8bcd4fccf6
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Add the code to support switching between fast and slow spiders.
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2020-07-27 23:30:11 -04:00 |
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Jeremy Rand
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883d882d0e
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Provide an API to set the default speed of a flea or a scorpion. This will allow the speed to be changed for different levels in the game. Need to add this API for spiders also.
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2020-07-27 22:27:18 -04:00 |
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Jeremy Rand
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36be001229
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Improve the randN function. Show a different colour on the border when drawing versus updating the game state.
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2020-07-27 21:47:28 -04:00 |
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Jeremy Rand
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9fde825430
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Add some constants for the spider score amounts.
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2020-07-27 14:25:22 -04:00 |
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Jeremy Rand
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3ad311dca6
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Add support for shooting the spider and displaying a score.
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2020-07-27 14:22:34 -04:00 |
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Jeremy Rand
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49baa1b360
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Get spider motion working in both directions.
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2020-07-26 16:00:46 -04:00 |
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Jeremy Rand
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d4fbd9f14c
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Almost done animating the spider.
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2020-07-26 02:13:06 -04:00 |
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Jeremy Rand
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bf01c47285
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Getting close to having the spider fully implemented...
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2020-07-26 00:05:32 -04:00 |
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Jeremy Rand
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18d0c3a80f
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Add some randomness when the spider changes direction.
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2020-07-25 14:54:35 -04:00 |
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Jeremy Rand
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213686ea1d
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The spider can now go down and to the right. More directions to come.
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2020-07-25 14:34:44 -04:00 |
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Jeremy Rand
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184461947b
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Getting closer on the spider
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2020-07-25 00:01:42 -04:00 |
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Jeremy Rand
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f890200a0d
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More spider work.
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2020-07-24 23:50:01 -04:00 |
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Jeremy Rand
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45bc6641e6
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Some more work on spider animation.
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2020-07-24 23:27:33 -04:00 |
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Jeremy Rand
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aa2e5408da
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Some code for adding a spider on the LHS.
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2020-07-24 14:42:03 -04:00 |
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Jeremy Rand
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4f74d630b9
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Start coding support for the spider. Also, try to show the performance of the main game loop in the border colour.
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2020-07-23 23:41:12 -04:00 |
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Jeremy Rand
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ada774960b
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Finish up work on the scorpion, adding support for shooting the scorpion. Some more cleanup of hard coded constants, moving them to globals.
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2020-07-22 23:46:04 -04:00 |
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Jeremy Rand
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68ecca75df
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Add support for fast moving scorpions which appear at later levels.
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2020-07-22 02:31:50 -04:00 |
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Jeremy Rand
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78f439d248
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Add a constant for creating a poisoned mushroom.
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2020-07-22 01:47:59 -04:00 |
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Jeremy Rand
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b3da2023e4
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Get the scorpion moving to the right and to the left and poisoning the mushrooms. Still need to handle exploding the scorpion and double speed scorpions.
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2020-07-22 00:06:01 -04:00 |
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Jeremy Rand
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44cb944f22
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More general cleanup and get rid of more magic numbers.
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2020-07-21 22:30:05 -04:00 |
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Jeremy Rand
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c614164c14
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Add code to get scorpions animating to the left. Lots of cleanup, adding a global data section that also has important global constants.
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2020-07-21 21:47:50 -04:00 |
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Jeremy Rand
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1ccdb1d0b6
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Start to get scorpion support into the game.
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2020-07-20 23:04:27 -04:00 |
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Jeremy Rand
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b813253c83
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Add support for shooting fleas. When a flea is shot once, it accelerates its drop to the bottom. On the second shot, it explodes.
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2020-07-20 00:05:18 -04:00 |
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Jeremy Rand
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8d2fbda733
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Not sure why this change didn't go with the previous commit.
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2020-07-19 15:16:20 -04:00 |
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Jeremy Rand
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88ea840e23
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Update the flea sprite as it drops. Add random routines. Thanks to John Brooks for those. Use the random routines to pick a column for the flea to drop from. Also, randomly leave behind a mushroom as it falls.
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2020-07-19 15:15:45 -04:00 |
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Jeremy Rand
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3fcd2ac8a8
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Double the speed of the flea.
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2020-07-19 02:19:56 -04:00 |
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Jeremy Rand
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063b4ce60c
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Fix the VBL code.
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2020-07-18 23:46:09 -04:00 |
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Jeremy Rand
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36104869b8
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Add the code to animate a flea down the screen on demand.
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2020-07-18 23:41:21 -04:00 |
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Jeremy Rand
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0336c692c4
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Add some code to support animating fleas in the game.
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2020-07-18 22:11:20 -04:00 |
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Jeremy Rand
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3c0ac30fcb
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A bunch of optimizations to reduce the number of instructions to draw tiles.
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2020-07-17 02:46:36 -04:00 |
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Jeremy Rand
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c79303d1dc
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Put a tile offset instead of a tile number in the dirty lists to eliminate the ASL operations that were necessary when iterating over the dirty tiles.
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2020-07-16 23:37:28 -04:00 |
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Jeremy Rand
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5c188bf91e
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More work on tiles. A tile now knows the tile number of its neighbours. This will make it easier for a sprite to mark the dirty tiles when drawing.
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2020-07-16 23:17:32 -04:00 |
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Jeremy Rand
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bff623af89
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Add a wait for VBL function.
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2020-07-15 23:20:35 -04:00 |
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Jeremy Rand
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69e3c4a62a
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Add some more code for background tiles.
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2020-07-15 23:10:25 -04:00 |
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Jeremy Rand
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3f9e7bd066
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Start implementing the code to draw the tiles on the screen.
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2020-07-15 00:32:14 -04:00 |
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Jeremy Rand
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63fb8a0e22
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Fix a bug in the _collision macro where the mask was not being used. Remove an unnecessary and instruction when drawing heads and body segments.
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2020-07-14 01:49:07 -04:00 |
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Jeremy Rand
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a718c8caef
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Lots of general sprite cleanup. Add sprites for the ship and the shots and include collision detection in those routines. I think all of the drawing code is done now, maybe?
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2020-07-09 22:55:08 -04:00 |
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Jeremy Rand
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bc91429e3a
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Finish the centipede segment sprites.
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2020-07-09 00:27:32 -04:00 |
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Jeremy Rand
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9e06ec991b
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Add a bunch more centipede segment sprites.
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2020-07-06 00:01:44 -04:00 |
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Jeremy Rand
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5de91ba0ec
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Add the left body segment sprites.
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2020-07-04 02:59:42 -04:00 |
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Jeremy Rand
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7f33c3d400
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Create all of the left facing head segment sprites.
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2020-07-04 02:45:53 -04:00 |
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Jeremy Rand
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72265face9
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Start adding centipede head segment sprites.
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2020-07-03 02:04:27 -04:00 |
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Jeremy Rand
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e5378bf5cb
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Add some info to the sprite design document about my plans for handling clipping.
|
2020-07-02 23:06:02 -04:00 |
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Jeremy Rand
|
598934446b
|
Finish the spider sprites and the explosion sprites. Remove "and" masking from the spider and scorpion sprites because they will be drawn first and will not overlap with anything on the foreground. Split the sprite.s file into a series of smaller files for each type of sprite. Add a file to describe the overall plan for the design of the sprites.
|
2020-07-02 22:57:52 -04:00 |
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Jeremy Rand
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e7ca4d4624
|
More spider sprites.
|
2020-07-01 13:53:42 -04:00 |
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Jeremy Rand
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5371b4e19e
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Add the first spider sprite.
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2020-06-30 23:38:27 -04:00 |
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Jeremy Rand
|
0393cf6bf6
|
Finish the sprites for the scorpion.
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2020-06-30 23:17:55 -04:00 |
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Jeremy Rand
|
cc03c8a0a0
|
Lots of optimization of the sprite code. More scorpions going in the right direction.
|
2020-06-29 23:45:40 -04:00 |
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Jeremy Rand
|
3fce9d866a
|
Change the way colour works to make it cheaper to overwrite any background colour with green which will make drawing centipede segments faster.
|
2020-06-28 22:21:32 -04:00 |
|
Jeremy Rand
|
1b1506aac8
|
Finish the left facing scorpion sprites. Still need to do the mirror image for right facing.
|
2020-06-23 23:38:47 -04:00 |
|
Jeremy Rand
|
e34ea58cc1
|
Add some more sprites for the scorpion.
|
2020-06-23 01:52:06 -04:00 |
|
Jeremy Rand
|
964da82807
|
Add some sprites for the scorpion.
|
2020-06-22 23:45:25 -04:00 |
|
Jeremy Rand
|
936b7315ce
|
Finish the sprites for the flea and the 300, 600 and 900 score notices.
|
2020-06-18 23:35:20 -04:00 |
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Jeremy Rand
|
eb480d76d8
|
Finish sprites for numbers and start work on the flea.
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2020-06-18 00:03:41 -04:00 |
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Jeremy Rand
|
d336ae86ff
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Finish the sprites for the letters.
|
2020-06-17 02:16:04 -04:00 |
|
Jeremy Rand
|
fd72e9f18b
|
Start coding up the sprite code.
|
2020-06-16 23:59:12 -04:00 |
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Jeremy Rand
|
ceb2d00ff0
|
Add some code to set the scan line control bytes and the colour palette for all of the different levels of the game.
|
2020-06-16 00:02:20 -04:00 |
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Jeremy Rand
|
a9810ecb75
|
Well, it launches, clears the screen, waits for a key and then quits. But it is a start.
|
2020-06-10 23:51:53 -04:00 |
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Jeremy Rand
|
dbe7e7ad3f
|
Initial Commit
|
2020-06-10 21:47:00 -04:00 |
|