add plants

src/world/generator/WorldGenerator.cpp

@@ -3,6 +3,7 @@
 #include <cstring>
 #include <iostream>
 
+#include "maths/util.hpp"
 #include "content/Content.hpp"
 #include "voxels/Block.hpp"
 #include "voxels/Chunk.hpp"
@@ -63,7 +64,7 @@ static inline const Biome* choose_biome(
     for (const auto& biome : biomes) {
         float score = 0.0f;
         for (uint i = 0; i < paramsCount; i++) {
-            score += glm::abs((params[i] - biome.parameters[i].origin) / 
+            score += glm::abs((params[i] - biome.parameters[i].value) / 
                               biome.parameters[i].weight);
         }
         if (score < chosenScore) {
@@ -92,6 +93,9 @@ void WorldGenerator::generate(
 
     std::memset(voxels, 0, sizeof(voxel) * CHUNK_VOL);
 
+    PseudoRandom plantsRand;
+    plantsRand.setSeed(chunkX, chunkZ);
+
     for (uint z = 0; z < CHUNK_D; z++) {
         for (uint x = 0; x < CHUNK_W; x++) {
             const Biome* biome = choose_biome(biomes, biomeParams, x, z);
@@ -104,6 +108,15 @@ void WorldGenerator::generate(
 
             generate_pole(seaLayers, seaLevel, height, seaLevel, voxels, x, z);
             generate_pole(groundLayers, height, 0, seaLevel, voxels, x, z);
+            
+            if (height+1 > seaLevel) {
+                // TODO: add underwater plants support
+                float rand = (plantsRand.randU32() % RAND_MAX) / static_cast<float>(RAND_MAX);
+                blockid_t plant = biome->plants.choose(rand);
+                if (plant) {
+                    voxels[vox_index(x, height+1, z)].id = plant;
+                }
+            }
         }
     }
 }