Public Perlin permutation table (#62)

rmrsk · Feb 15, 2024 · 8778ff1 · 8778ff1
1 parent 5f79b6e
commit 8778ff1
Showing 1 changed file with 19 additions and 19 deletions.
diff --git a/Source/EBGeometry_AnalyticDistanceFunctions.hpp b/Source/EBGeometry_AnalyticDistanceFunctions.hpp
@@ -52,6 +52,23 @@ clamp(const Vec3T<T>& v, const Vec3T<T>& lo, const Vec3T<T>& hi)
   return Vec3T<T>(clamp(v[0], lo[0], hi[0]), clamp(v[1], lo[1], hi[1]), clamp(v[2], lo[2], hi[2]));
 }
 
+/*!
+  @brief Ken Perlin's original permutation array. Use for initializing PerlinSDF
+*/
+constexpr static std::array<int, 256> s_perlinPermutationTable = {
+  151, 160, 137, 91,  90,  15,  131, 13,  201, 95,  96,  53,  194, 233, 7,   225, 140, 36,  103, 30,  69,  142,
+  8,   99,  37,  240, 21,  10,  23,  190, 6,   148, 247, 120, 234, 75,  0,   26,  197, 62,  94,  252, 219, 203,
+  117, 35,  11,  32,  57,  177, 33,  88,  237, 149, 56,  87,  174, 20,  125, 136, 171, 168, 68,  175, 74,  165,
+  71,  134, 139, 48,  27,  166, 77,  146, 158, 231, 83,  111, 229, 122, 60,  211, 133, 230, 220, 105, 92,  41,
+  55,  46,  245, 40,  244, 102, 143, 54,  65,  25,  63,  161, 1,   216, 80,  73,  209, 76,  132, 187, 208, 89,
+  18,  169, 200, 196, 135, 130, 116, 188, 159, 86,  164, 100, 109, 198, 173, 186, 3,   64,  52,  217, 226, 250,
+  124, 123, 5,   202, 38,  147, 118, 126, 255, 82,  85,  212, 207, 206, 59,  227, 47,  16,  58,  17,  182, 189,
+  28,  42,  223, 183, 170, 213, 119, 248, 152, 2,   44,  154, 163, 70,  221, 153, 101, 155, 167, 43,  172, 9,
+  129, 22,  39,  253, 19,  98,  108, 110, 79,  113, 224, 232, 178, 185, 112, 104, 218, 246, 97,  228, 251, 34,
+  242, 193, 238, 210, 144, 12,  191, 179, 162, 241, 81,  51,  145, 235, 249, 14,  239, 107, 49,  192, 214, 31,
+  181, 199, 106, 157, 184, 84,  204, 176, 115, 121, 50,  45,  127, 4,   150, 254, 138, 236, 205, 93,  222, 114,
+  67,  29,  24,  72,  243, 141, 128, 195, 78,  66,  215, 61,  156, 180};
+
 /*!
   @brief Signed distance function for a plane
 */
@@ -891,8 +908,8 @@ class PerlinSDF : public SignedDistanceFunction<T>
 
     // By default, use Ken Perlin's original permutation table
     for (int i = 0; i < 256; i++) {
-      m_permutationTable[i]       = s_permutationTable[i];
-      m_permutationTable[i + 256] = s_permutationTable[i];
+      m_permutationTable[i]       = s_perlinPermutationTable[i];
+      m_permutationTable[i + 256] = s_perlinPermutationTable[i];
     }
 
 #if 1 // Development code
@@ -966,23 +983,6 @@ class PerlinSDF : public SignedDistanceFunction<T>
   }
 
 protected:
-  /*!
-    @brief Ken Perlin's original permutation array
-  */
-  constexpr static std::array<int, 256> s_permutationTable = {
-    151, 160, 137, 91,  90,  15,  131, 13,  201, 95,  96,  53,  194, 233, 7,   225, 140, 36,  103, 30,  69,  142,
-    8,   99,  37,  240, 21,  10,  23,  190, 6,   148, 247, 120, 234, 75,  0,   26,  197, 62,  94,  252, 219, 203,
-    117, 35,  11,  32,  57,  177, 33,  88,  237, 149, 56,  87,  174, 20,  125, 136, 171, 168, 68,  175, 74,  165,
-    71,  134, 139, 48,  27,  166, 77,  146, 158, 231, 83,  111, 229, 122, 60,  211, 133, 230, 220, 105, 92,  41,
-    55,  46,  245, 40,  244, 102, 143, 54,  65,  25,  63,  161, 1,   216, 80,  73,  209, 76,  132, 187, 208, 89,
-    18,  169, 200, 196, 135, 130, 116, 188, 159, 86,  164, 100, 109, 198, 173, 186, 3,   64,  52,  217, 226, 250,
-    124, 123, 5,   202, 38,  147, 118, 126, 255, 82,  85,  212, 207, 206, 59,  227, 47,  16,  58,  17,  182, 189,
-    28,  42,  223, 183, 170, 213, 119, 248, 152, 2,   44,  154, 163, 70,  221, 153, 101, 155, 167, 43,  172, 9,
-    129, 22,  39,  253, 19,  98,  108, 110, 79,  113, 224, 232, 178, 185, 112, 104, 218, 246, 97,  228, 251, 34,
-    242, 193, 238, 210, 144, 12,  191, 179, 162, 241, 81,  51,  145, 235, 249, 14,  239, 107, 49,  192, 214, 31,
-    181, 199, 106, 157, 184, 84,  204, 176, 115, 121, 50,  45,  127, 4,   150, 254, 138, 236, 205, 93,  222, 114,
-    67,  29,  24,  72,  243, 141, 128, 195, 78,  66,  215, 61,  156, 180};
-
   /*!
     @brief Noise frequency
   */