add 'heights-interpolation', 'biomes-interpolation'

src/content/loading/GeneratorLoader.cpp

@@ -202,6 +202,16 @@ void ContentLoader::loadGenerator(
     map.at("biome-parameters").get(def.biomeParameters);
     map.at("biome-bpd").get(def.biomesBPD);
     map.at("heights-bpd").get(def.heightsBPD);
+    std::string interpName;
+    map.at("heights-interpolation").get(interpName);
+    if (auto interp = InterpolationType_from(interpName)) {
+        def.heightsInterpolation = *interp;
+    }
+    map.at("biomes-interpolation").get(interpName);
+    if (auto interp = InterpolationType_from(interpName)) {
+        def.biomesInterpolation = *interp;
+    }
+
     map.at("sea-level").get(def.seaLevel);
     map.at("wide-structs-chunks-radius").get(def.wideStructsChunksRadius);
     if (map.has("heightmap-inputs")) {

src/maths/Heightmap.cpp

@@ -5,6 +5,17 @@
 #include <stdexcept>
 #include <glm/glm.hpp>
 
+std::optional<InterpolationType> InterpolationType_from(std::string_view str) {
+    if (str == "nearest") {
+        return InterpolationType::NEAREST;
+    } else if (str == "linear") {
+        return InterpolationType::LINEAR;
+    } else if (str == "cubic") {
+        return InterpolationType::CUBIC;
+    }
+    return std::nullopt;
+}
+
 static inline float sample_at(
     const float* buffer,
     uint width,

src/maths/Heightmap.hpp

@@ -2,6 +2,7 @@
 
 #include <vector>
 #include <string>
+#include <optional>
 
 #include "typedefs.hpp"
 #include "maths/Heightmap.hpp"
@@ -12,6 +13,8 @@ enum class InterpolationType {
     CUBIC,
 };
 
+std::optional<InterpolationType> InterpolationType_from(std::string_view str);
+
 class Heightmap {
     std::vector<float> buffer;
     uint width, height;

src/world/generator/GeneratorDef.hpp

@@ -209,6 +209,12 @@ struct GeneratorDef {
     /// @brief Heightmap blocks per dot
     uint heightsBPD = 4;
 
+    /// @brief Biome parameter maps interpolation method
+    InterpolationType biomesInterpolation = InterpolationType::LINEAR;
+
+    /// @brief Height maps interpolation method
+    InterpolationType heightsInterpolation = InterpolationType::LINEAR;
+
     /// @brief Number of chunks must be generated before and after wide
     /// structures placement triggered
     uint wideStructsChunksRadius = 3;

src/world/generator/WorldGenerator.cpp

@@ -307,13 +307,13 @@ void WorldGenerator::generateBiomes(
         copy->resize(
             floordiv(CHUNK_W, def.heightsBPD) + 1,
             floordiv(CHUNK_D, def.heightsBPD) + 1,
-            InterpolationType::LINEAR
+            def.heightsInterpolation
         );
         prototype.heightmapInputs.push_back(std::move(copy));
     }
     for (const auto& map : biomeParams) {
         map->resize(
-            CHUNK_W + bpd, CHUNK_D + bpd, InterpolationType::LINEAR
+            CHUNK_W + bpd, CHUNK_D + bpd, def.biomesInterpolation
         );
         map->crop(0, 0, CHUNK_W, CHUNK_D);
     }
@@ -345,7 +345,7 @@ void WorldGenerator::generateHeightmap(
     );
     prototype.heightmap->clamp();
     prototype.heightmap->resize(
-        CHUNK_W + bpd, CHUNK_D + bpd, InterpolationType::LINEAR
+        CHUNK_W + bpd, CHUNK_D + bpd, def.heightsInterpolation
     );
     prototype.heightmap->crop(0, 0, CHUNK_W, CHUNK_D);
     prototype.level = ChunkPrototypeLevel::HEIGHTMAP;