+struct Generator::ValueField {
+
+ Interpolation solidity;
+ Interpolation humidity;
+ Interpolation temperature;
+ Interpolation richness;
+ Interpolation randomness;
+
+ static Parameters GetParams(const glm::ivec3 &pos) noexcept {
+ Parameters p;
+ p.a = pos / 4;
+ p.b = p.a + 1;
+ p.d = pos % 4;
+ return p;
+ }
+
+ static float Interpolate(const Interpolation &i, const Parameters &p) noexcept {
+ constexpr float A[4] = { 1.0f, 0.75f, 0.5f, 0.25f };
+ constexpr float B[4] = { 0.0f, 0.25f, 0.5f, 0.75f };
+ const float l1[4] = {
+ i.samples[p.a.z][p.a.y][p.a.x] * A[p.d.x] + i.samples[p.a.z][p.a.y][p.b.x] * B[p.d.x],
+ i.samples[p.a.z][p.b.y][p.a.x] * A[p.d.x] + i.samples[p.a.z][p.b.y][p.b.x] * B[p.d.x],
+ i.samples[p.b.z][p.a.y][p.a.x] * A[p.d.x] + i.samples[p.b.z][p.a.y][p.b.x] * B[p.d.x],
+ i.samples[p.b.z][p.b.y][p.a.x] * A[p.d.x] + i.samples[p.b.z][p.b.y][p.b.x] * B[p.d.x],
+ };
+ const float l2[2] = {
+ l1[0] * A[p.d.y] + l1[1] * B[p.d.y],
+ l1[2] * A[p.d.y] + l1[3] * B[p.d.y],
+ };
+ return l2[0] * A[p.d.z] + l2[1] * B[p.d.z];
+ }
+
+};
+