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Add smooth transitions between biomes

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Simliar to the way biome transitions are rendered in Minecraft itself,
add smoothing by averaging biome-based colors over all biome values with
distance ≤3 (1-norm).
This commit is contained in:
Matthias Schiffer 2020-06-20 01:15:37 +02:00
parent 623d70ec9e
commit eb831608e0
Signed by: neocturne
GPG key ID: 16EF3F64CB201D9C
1 changed files with 28 additions and 1 deletions
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29
src/MinedMap.cpp
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@ -36,6 +36,7 @@
#include <cstring>
#include <cstdlib>
#include <iostream>
#include <unordered_map>
#include <stdexcept>
#include <sstream>
#include <system_error>
@ -49,6 +50,7 @@
namespace MinedMap {
static const int BIOME_SMOOTH = 3;
static const size_t DIM = World::Region::SIZE*World::Chunk::SIZE;
@ -90,7 +92,32 @@ static Resource::Color collectColors(size_t x, size_t z, const World::Block &blo
if (!block.isVisible())
return Resource::Color();
return block.getColor(biomeAt(x, z, biomemaps));
std::unordered_map<uint8_t, size_t> biomes;
for (int dx = -BIOME_SMOOTH; dx <= BIOME_SMOOTH; dx++) {
for (int dz = -BIOME_SMOOTH; dz <= BIOME_SMOOTH; dz++) {
if (std::abs(dx) + std::abs(dz) > BIOME_SMOOTH)
continue;
uint8_t biome = biomeAt(x+dx, z+dz, biomemaps);
if (biomes.count(biome))
biomes[biome]++;
else
biomes[biome] = 1;
}
}
Resource::FloatColor c = {};
size_t total = 0;
for (const auto &e : biomes) {
uint8_t biome = e.first;
size_t count = e.second;
c = c + count * block.getColor(biome);
total += count;
}
return (1.0f / total) * c;
}
static void addChunk(Resource::Color image[DIM*DIM], uint8_t lightmap[2*DIM*DIM], size_t X, size_t Z,