zirc/src/player.zig, branch main Zig raycaster fun https://git.l-3.space/zirc/atom/src/player.zig?h=main 2021-10-10T20:00:55Z Refactor: extract rendering code from Player struct into Renderer 2021-10-10T20:00:55Z tslil clingman 2021-10-10T19:31:36Z urn:sha1:cb15709551921e111d2648f7d6545e4d0e3fdcd6 Some bonus off by ones and rounding corrections Off by ones! 2021-10-10T16:58:17Z tslil clingman 2021-10-10T16:58:17Z urn:sha1:442f7210ea40f7f74b752575ee81b5f9394d6ea9 Fixed some artefacts for walls with both lower and upper parts 2021-10-09T01:38:41Z tslil clingman 2021-10-09T01:38:41Z urn:sha1:1aad9b2a1c5e86c8c6ea635772db5ddb20af39ed I can't quite explain it, but something about the way floating point numbers round meant that we weren't calculating consistent distances (in pixels) for the length of the strip between the top of the floor and the bottom of the ceiling in cells which had both. Variable height ceilings! 2021-10-07T15:33:36Z tslil clingman 2021-10-07T15:25:09Z urn:sha1:d4f2376bb0ea219b79dac3f4f37b77342ca6ef4a Plus bonus graphical artefacts around the edges of such! In the end the majority of this code was rather easy: take the upwards floor drawing code and reflect it. However, there were many edge-cases and plenty of off-by-one pixels and rounding issues that didn't quite work the same way going down as they do going up. Also the object drawing code used to take advantage of the fact that the z-buffer was painted bottom-up only, so that required change too. Of course i didn't need i32 ... 2021-09-26T16:10:44Z tslil clingman 2021-09-26T16:10:44Z urn:sha1:8ddc801e21bb02d0de20351f692b48e2e19c94c4 There was really no reason to use a BoundedArray instead of an array 2021-09-23T03:13:34Z tslil clingman 2021-09-23T03:12:19Z urn:sha1:48f51653ae90bdabb5bb738a5c78cd9a53f498a9 Switch to more accurate version 2021-09-23T03:05:38Z tslil clingman 2021-09-23T03:05:38Z urn:sha1:d932cb0a1fd0235c8f298dd7f3acbf2864338903 Pre-emptive micro-optimisation is bad. There aren't that many sprites pixels usually anyway. Colour blending 2021-09-23T02:59:31Z tslil clingman 2021-09-23T02:46:47Z urn:sha1:9d25e1d69dede7d79ca9115a4ce4e65af49b8ddc Some amount of work went into finding appropriate integer arithmetic formulae that were reasonably accurate. At this point i've settled for the incorrect-but-faster version. The better-though-slower formulas are still there in case i change my mind. It would help to have an assumption such as, but not limited to, the surfaces are always going to be fully opaque. Render objects by writing pixels 2021-09-21T02:41:32Z tslil clingman 2021-09-21T02:38:04Z urn:sha1:a657cc828cdcbb07f460d53f78a12dfe00a57325 This confines hardware acceleration to scaling and the background sprite. Unfortunately it would seem that to do proper object rendering (partial transparency) i'll have to implement colour mixing myself. Corrected rendering bug 2021-09-21T02:03:21Z tslil clingman 2021-09-21T01:17:01Z urn:sha1:276804c4b8db837e238880d4bc668ed6c65dd42a