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refactor: extract biome logic into separate

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zhenyan121
2026-04-17 22:45:44 +08:00
parent f2328d19fd
commit 30a4713092
8 changed files with 81 additions and 78 deletions
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47
src/tools/math_tools.cpp
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@@ -2,12 +2,6 @@
#include <glm/gtc/type_ptr.hpp>
#include <cmath>
#include <Cubed/config.hpp>
#include <Cubed/gameplay/chunk_status.hpp>
#include <Cubed/tools/perlin_noise.hpp>
namespace Math {
void extract_frustum_planes(const glm::mat4& mvp_matrix, std::vector<glm::vec4>& planes) {
if (planes.size() != 6) {
@@ -34,44 +28,5 @@ namespace Math {
}
}
int get_interpolated_height(float world_x, float world_z, float temp, float humid) {
auto weight = [](float t, float h, float ct, float ch) -> float {
float dt = t - ct;
float dh = h - ch;
float dist = std::sqrt(dt*dt + dh*dh);
return std::max(0.0f, 0.5f - dist);
};
float w_mountain = weight(temp, humid, 0.25f, 0.15f);
float w_plain = weight(temp, humid, 0.50f, 0.40f);
float w_desert = weight(temp, humid, 0.75f, 0.15f);
float w_forest = weight(temp, humid, 0.75f, 0.75f);
// adjust transitions between chunks
float pow_n = 8.0f; // the larger n is, the purer the biome
w_mountain = std::pow(w_mountain, pow_n) * MOUNTAIN_FREQ;
w_plain = std::pow(w_plain, pow_n) * PLAIN_FREQ;
w_desert = std::pow(w_desert, pow_n) * DESERT_FREQ;
w_forest = std::pow(w_forest, pow_n) * FOREST_FREQ;
float total = w_mountain + w_plain + w_desert + w_forest;
w_mountain /= total; w_plain /= total; w_desert /= total; w_forest /= total;
auto sample_height = [&](Biome b) -> float {
auto range = get_biome_height_range(b);
auto [f1, f2, f3] = get_noise_frequencies_for_biome(b);
float n =
1.00f * PerlinNoise::noise(world_x * f1, 0.5f, world_z * f1) +
0.50f * PerlinNoise::noise(world_x * f2, 0.5f, world_z * f2) +
0.25f * PerlinNoise::noise(world_x * f3, 0.5f, world_z * f3);
n /= 1.75f;
return range.base_y + n * range.amplitude;
};
float h = w_mountain * sample_height(Biome::MOUNTAIN)
+ w_plain * sample_height(Biome::PLAIN)
+ w_desert * sample_height(Biome::DESERT)
+ w_forest * sample_height(Biome::FOREST);
return static_cast<int>(h);
}
}