Added a checkbox for bilinear filtering of color and altitude #17
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Bilinear filtering makes hills look smoother, but it makes intentionally-angular things like the pyramids in the example maps look weird.
SudoMike
commented
Nov 23, 2022
| var b2 = b & 0xFF; | ||
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| var invt = 1.0 - t; | ||
| return 0xFF000000 | |
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Performance could probably could be improved on by using fixed point math here, depending on what the JIT compiler does.
SudoMike
commented
Nov 23, 2022
| // between those to get the final color. | ||
| var upper_color = ColorInterp(map.color[ulindex], map.color[urindex], plxt); | ||
| var lower_color = ColorInterp(map.color[llindex], map.color[lrindex], plxt); | ||
| final_color = ColorInterp(lower_color, upper_color, plyt); |
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Perf improvement opportunity (probably minor): decompose the 4 corners from uint32's into RGB values ahead of time (better yet, make map.color already store separate R, G, and B values), do the bilinear filtering, and then recompose only at the end. This would save recomposing upper_color and lower_color into uint32's, then immediately decomposing them again.
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Bilinear filtering makes hills look smoother, but it makes intentionally-angular things like the pyramids in the example maps look weird.