lovr.math.noise;

src/api/math.c

@@ -67,6 +67,19 @@ int l_lovrMathOrientationToDirection(lua_State* L) {
   return 3;
 }
 
+int l_lovrMathNoise(lua_State* L) {
+  switch (lua_gettop(L)) {
+    case 0:
+    case 1: lua_pushnumber(L, lovrMathNoise1(luaL_checknumber(L, 1))); return 1;
+    case 2: lua_pushnumber(L, lovrMathNoise2(luaL_checknumber(L, 1), luaL_checknumber(L, 2))); return 1;
+    case 3: lua_pushnumber(L, lovrMathNoise3(luaL_checknumber(L, 1), luaL_checknumber(L, 2), luaL_checknumber(L, 3))); return 1;
+    case 4:
+    default:
+      lua_pushnumber(L, lovrMathNoise4(luaL_checknumber(L, 1), luaL_checknumber(L, 2), luaL_checknumber(L, 3), luaL_checknumber(L, 4)));
+      return 1;
+  }
+}
+
 int l_lovrMathRandom(lua_State* L) {
   luax_pushtype(L, RandomGenerator, lovrMathGetRandomGenerator());
   lua_insert(L, 1);
@@ -130,6 +143,7 @@ const luaL_Reg lovrMath[] = {
   { "newTransform", l_lovrMathNewTransform },
   { "orientationToDirection", l_lovrMathOrientationToDirection },
   { "lookAt", l_lovrMathLookAt },
+  { "noise", l_lovrMathNoise },
   { "random", l_lovrMathRandom },
   { "randomNormal", l_lovrMathRandomNormal },
   { "getRandomSeed", l_lovrMathGetRandomSeed },

src/math/math.c

@@ -1,4 +1,5 @@
 #include "math.h"
+#include "lib/noise1234/noise1234.h"
 #include "util.h"
 #include <math.h>
 #include <string.h>
@@ -47,3 +48,19 @@ float lovrMathLinearToGamma(float x) {
     return 1.055 * powf(x, 1. / 2.4) - .055;
   }
 }
+
+float lovrMathNoise1(float x) {
+  return noise1(x) * .5f + .5f;
+}
+
+float lovrMathNoise2(float x, float y) {
+  return noise2(x, y) * .5f + .5f;
+}
+
+float lovrMathNoise3(float x, float y, float z) {
+  return noise3(x, y, z) * .5f + .5f;
+}
+
+float lovrMathNoise4(float x, float y, float z, float w) {
+  return noise4(x, y, z, w) * .5f + .5f;
+}

src/math/math.h

@@ -24,3 +24,7 @@ RandomGenerator* lovrMathGetRandomGenerator();
 void lovrMathOrientationToDirection(float angle, float ax, float ay, float az, vec3 v);
 float lovrMathGammaToLinear(float x);
 float lovrMathLinearToGamma(float x);
+float lovrMathNoise1(float x);
+float lovrMathNoise2(float x, float y);
+float lovrMathNoise3(float x, float y, float z);
+float lovrMathNoise4(float x, float y, float z, float w);