add heightmap write-only property 'noiseSeed'

res/generators/default.lua

@@ -7,15 +7,18 @@ layers = {
     {block="base:bazalt", height=1},
 }
 
-function generate_heightmap(x, y, w, h)
+function generate_heightmap(x, y, w, h, seed)
     local umap = Heightmap(w, h)
     local vmap = Heightmap(w, h)
+    umap.noiseSeed = seed
+    vmap.noiseSeed = seed
     umap:noise({x+521, y+73}, 0.05, 1, 20.8)
     umap:noise({x+51, y+75}, 0.05, 1, 21.8)
     vmap:noise({x+521, y+70}, 0.1, 3, 35.8)
     vmap:noise({x+95, y+246}, 0.15, 3, 35.8)
 
     local map = Heightmap(w, h)
+    map.noiseSeed = seed
     map:noise({x, y}, 0.02, 7, 0.2)
     map:noise({x, y}, 0.06, 8, 0.4, umap, vmap)
     map:mul(0.5)
@@ -23,6 +26,7 @@ function generate_heightmap(x, y, w, h)
     map:pow(2.0)
 
     local rivermap = Heightmap(w, h)
+    rivermap.noiseSeed = seed
     rivermap:noise({x+21, y+12}, 0.1, 4)
     rivermap:abs()
     rivermap:mul(2.0)

src/logic/scripting/lua/lua_custom_types.hpp

@@ -6,6 +6,8 @@
 #include "lua_commons.hpp"
 #include "maths/Heightmap.hpp"
 
+struct fnl_state;
+
 namespace lua {
     class Userdata {
     public:
@@ -33,9 +35,9 @@ namespace lua {
 
     class LuaHeightmap : public Userdata {
         std::shared_ptr<Heightmap> map;
+        std::unique_ptr<fnl_state> noise;
     public:
-        LuaHeightmap(uint width, uint height) 
-        : map(std::make_shared<Heightmap>(width, height)) {}
+        LuaHeightmap(uint width, uint height);
 
         virtual ~LuaHeightmap();
 
@@ -63,6 +65,12 @@ namespace lua {
             return map;
         }
 
+        fnl_state* getNoise() {
+            return noise.get();
+        }
+
+        void setSeed(int64_t seed);
+
         static int createMetatable(lua::State*);
         inline static std::string TYPENAME = "Heightmap";
     };

src/logic/scripting/lua/lua_type_heightmap.cpp

@@ -15,9 +15,16 @@
 
 using namespace lua;
 
-static fnl_state noise = fnlCreateState();
+LuaHeightmap::LuaHeightmap(uint width, uint height)
+ : map(std::make_shared<Heightmap>(width, height)),
+   noise(std::make_unique<fnl_state>(fnlCreateState())) 
+{}
 
-LuaHeightmap::~LuaHeightmap() {;
+LuaHeightmap::~LuaHeightmap() {
+}
+
+void LuaHeightmap::setSeed(int64_t seed) {
+    noise->seed = seed;
 }
 
 static int l_dump(lua::State* L) {
@@ -51,6 +58,7 @@ static int l_noise(lua::State* L) {
         uint w = heightmap->getWidth();
         uint h = heightmap->getHeight();
         auto heights = heightmap->getValues();
+        auto noise = heightmap->getNoise();
 
         auto offset = tovec<2>(L, 2);
 
@@ -86,7 +94,7 @@ static int l_noise(lua::State* L) {
                         v += shiftMapY->getValues()[i];
                     }
 
-                    value += fnlGetNoise2D(&noise, u, v) /
+                    value += fnlGetNoise2D(noise, u, v) /
                             static_cast<float>(1 << c) * multiplier;
                     heights[i] = value;
                 }
@@ -185,6 +193,20 @@ static int l_meta_index(lua::State* L) {
     return 0;
 }
 
+static int l_meta_newindex(lua::State* L) {
+    auto map = touserdata<LuaHeightmap>(L, 1);
+    if (map == nullptr) {
+        return 0;
+    }
+    if (isstring(L, 2)) {
+        auto fieldname = tostring(L, 2);
+        if (!std::strcmp(fieldname, "noiseSeed")) {
+            map->setSeed(tointeger(L, 3));
+        }
+    }
+    return 0;
+}
+
 static int l_meta_tostring(lua::State* L) {
     auto map = touserdata<LuaHeightmap>(L, 1);
     if (map == nullptr) {
@@ -202,11 +224,13 @@ static int l_meta_tostring(lua::State* L) {
 }
 
 int LuaHeightmap::createMetatable(lua::State* L) {
-    createtable(L, 0, 2);
+    createtable(L, 0, 3);
     pushcfunction(L, lua::wrap<l_meta_tostring>);
     setfield(L, "__tostring");
     pushcfunction(L, lua::wrap<l_meta_index>);
     setfield(L, "__index");
+    pushcfunction(L, lua::wrap<l_meta_newindex>);
+    setfield(L, "__newindex");
 
     createtable(L, 0, 1);
     pushcfunction(L, lua::wrap<l_meta_meta_call>);

src/logic/scripting/scripting.cpp

@@ -703,14 +703,15 @@ public:
       {}
 
     std::shared_ptr<Heightmap> generateHeightmap(
-        const glm::ivec2& offset, const glm::ivec2& size
+        const glm::ivec2& offset, const glm::ivec2& size, uint64_t seed
     ) override {
         auto L = lua::get_main_thread();
         lua::pushenv(L, *env);
         if (lua::getfield(L, "generate_heightmap")) {
             lua::pushivec_stack(L, offset);
             lua::pushivec_stack(L, size);
-            if (lua::call_nothrow(L, 4)) {
+            lua::pushinteger(L, seed);
+            if (lua::call_nothrow(L, 5)) {
                 auto map = lua::touserdata<lua::LuaHeightmap>(L, -1)->getHeightmap();
                 lua::pop(L, 2);
                 return map;

src/world/generator/GeneratorDef.hpp

@@ -23,7 +23,7 @@ public:
     virtual ~GeneratorScript() = default;
 
     virtual std::shared_ptr<Heightmap> generateHeightmap(
-        const glm::ivec2& offset, const glm::ivec2& size) = 0;
+        const glm::ivec2& offset, const glm::ivec2& size, uint64_t seed) = 0;
 
     virtual const std::vector<BlocksLayer>& getLayers() const = 0;
 

src/world/generator/WorldGenerator.cpp

@@ -15,10 +15,12 @@ WorldGenerator::WorldGenerator(
 }
 
 #include "util/timeutil.hpp"
-void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ, int seed) {
+void WorldGenerator::generate(
+    voxel* voxels, int chunkX, int chunkZ, uint64_t seed
+) {
     timeutil::ScopeLogTimer log(555);
     auto heightmap = def.script->generateHeightmap(
-        {chunkX*CHUNK_W, chunkZ*CHUNK_D}, {CHUNK_W, CHUNK_D}
+        {chunkX*CHUNK_W, chunkZ*CHUNK_D}, {CHUNK_W, CHUNK_D}, seed
     );
     auto values = heightmap->getValues();
     const auto& layers = def.script->getLayers();
@@ -30,6 +32,7 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ, int seed) {
 
     for (uint z = 0; z < CHUNK_D; z++) {
         for (uint x = 0; x < CHUNK_W; x++) {
+            // generate water
             int height = values[z * CHUNK_W + x] * CHUNK_H;
             for (uint y = height+1; y <= seaLevel; y++) {
                 voxels[vox_index(x, y, z)].id = baseWater;
@@ -38,12 +41,15 @@ void WorldGenerator::generate(voxel* voxels, int chunkX, int chunkZ, int seed) {
             uint y = height;
             uint layerExtension = 0;
             for (const auto& layer : layers) {
+                // skip layer if can't be generated under sea level
                 if (y < seaLevel && !layer.below_sea_level) {
                     layerExtension = std::max(0, layer.height);
                     continue;
                 }
+                
                 uint layerHeight = layer.height;
                 if (layerHeight == -1) {
+                    // resizeable layer
                     layerHeight = y - lastLayersHeight + 1;
                 } else {
                     layerHeight += layerExtension;

src/world/generator/WorldGenerator.hpp

@@ -18,7 +18,7 @@ public:
     );
     virtual ~WorldGenerator() = default;
 
-    virtual void generate(voxel* voxels, int x, int z, int seed);
+    virtual void generate(voxel* voxels, int x, int z, uint64_t seed);
 
     inline static std::string DEFAULT = "core:default";
 };