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minedmap/tile_renderer: implement biome smoothing

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Rather than the diamond-shaped kernel used by the old implemenation, we
now use the approximation of a Gauss filter. In addition, the kernel
size is decreased, reducing the strength of the blur effect.
This commit is contained in:
Matthias Schiffer 2023-08-03 19:06:20 +02:00
parent b650b096ef
commit c38f00e411
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
1 changed files with 28 additions and 4 deletions
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32
src/bin/minedmap/tile_renderer.rs
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@ -79,11 +79,15 @@ impl<'a> TileRenderer<'a> {
}
fn block_color_at(
_region_group: &RegionGroup<ProcessedRegion>,
region_group: &RegionGroup<ProcessedRegion>,
chunk: &ProcessedChunk,
_chunk_coords: ChunkCoords,
chunk_coords: ChunkCoords,
block_coords: LayerBlockCoords,
) -> Option<Vec3> {
const SMOOTH: [[f32; 3]; 3] = [[41.0, 26.0, 7.0], [26.0, 16.0, 4.0], [7.0, 4.0, 1.0]];
const X: isize = SMOOTH[0].len() as isize - 1;
const Z: isize = SMOOTH.len() as isize - 1;
let block = chunk.blocks[block_coords]?;
let depth = chunk.depths[block_coords]?;
@ -91,9 +95,29 @@ impl<'a> TileRenderer<'a> {
return Some(block_color(block, None, depth.0 as f32));
}
let biome = chunk.biomes[block_coords].as_ref()?;
let mut total = 0.0;
let mut color = Vec3::ZERO;
for dz in -Z..=Z {
for dx in -X..=X {
let w = SMOOTH[dz.unsigned_abs()][dx.unsigned_abs()];
if w == 0.0 {
continue;
}
Some(block_color(block, Some(biome), depth.0 as f32))
let Some(biome) = biome_at(region_group, chunk_coords, block_coords, dx as i32, dz as i32) else {
continue;
};
total += w;
color += w * block_color(block, Some(biome), depth.0 as f32);
}
}
if total == 0.0 {
return None;
}
Some(color / total)
}
fn render_chunk(