Smooth out noise at noise seed borders

1 files changed, 9 insertions, 5 deletions

diff --git a/src/Math/Noise.cpp b/src/Math/Noise.cpp
index a174efe..1ef8ce5 100644
--- a/src/Math/Noise.cpp
+++ b/src/Math/Noise.cpp
@@ -17,14 +17,16 @@ float noise2d(Vector<2> pos) {
         {0.01f, {250.0f, 20.0f}, 0.5f},
     };
 
+    auto wrap = [](auto x) -> float {
+        float wx = std::fmod(x, NOISE_SEED_SIZE);
+        return wx < 0 ? wx + NOISE_SEED_SIZE : wx;
+    };
+
     auto total_weight = 0.0f;
     auto res = 0.0f;
     for (const auto& layer : layers) {
         auto pos_with_scale_and_offset = (pos - layer.offset) * layer.scale;
-        auto p = pos_with_scale_and_offset.map([](auto x) -> float {
-            float wx = std::fmod(x, NOISE_SEED_SIZE);
-            return wx < 0 ? wx + NOISE_SEED_SIZE : wx;
-        });
+        auto p = pos_with_scale_and_offset.map(wrap);
 
         auto x = p.x();
         auto y = p.y();
@@ -33,7 +35,9 @@ float noise2d(Vector<2> pos) {
         auto x2 = x1 + 1.0f;
         auto y1 = y2 + 1.0f;
 
-        auto value = [](float x, float y){ return noise_seed[(uint)x][(uint)y] / 255.0f; };
+        auto value = [=](float x, float y){
+            return noise_seed[(uint)wrap(x)][(uint)wrap(y)] / 255.0f;
+        };
 
         auto q12 = value(x1, y2);
         auto q22 = value(x2, y2);