floor rendering fix - #48
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zZeck
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Apr 17, 2021
| while (count--) { | ||
| /* extract the x/y coordinates */ | ||
| coord = ((frac >> (32-7)) | ((frac >> (32-23)) << 7)) & 16383; | ||
| coord = ((yfrac >> 24) & 0b00000001111111) | (( xfrac >> 17) & 0b11111110000000); |
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Binary constants are not standard C, but it makes the code easier to understand. I can change this if needed.
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I can confirm this PR works as expected:
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In hindsight, I should have made the comparison images on a level with straight lines in the floor texture. Thanks for vouching for the PR. Planning on doing anything else in ROTT? |
I don't have much in mind right now, but maybe I'll contribute QOL improvements in the future 🙂 |
Calinou
approved these changes
Nov 4, 2021
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The original code has insufficient precision in the xstep and ystep used for floor/ceiling. This lack of precision results in very visible error accumulating as DrawRow renders left to right. Look at the distortion on the right side in the original.
Original
Improved
Credit to a 2019 Kaiser tweet for pointing out the problem.
It would be nice if #42 went in ahead of this. I did a hackier work around the same mingw-w64 problem for w_wad.c.