refactor: biome build (#5)

* refactor: rename Biome to BiomeType

* feat: add biome builder

src/gameplay/builders/river_builder.cpp

@@ -0,0 +1,59 @@
+#include "Cubed/gameplay/builders/river_builder.hpp"
+
+#include "Cubed/gameplay/chunk.hpp"
+#include "Cubed/gameplay/chunk_generator.hpp"
+namespace Cubed {
+RiverBuilder::RiverBuilder(ChunkGenerator& chunk_generator)
+    : m_chunk_generator(chunk_generator) {}
+
+void RiverBuilder::build_biome() {
+    BiomeBuilder::build_bottom();
+    build_blocks();
+};
+
+void RiverBuilder::build_blocks() {
+    auto& m_chunk = m_chunk_generator.chunk();
+    auto& m_blocks = m_chunk.blocks();
+    auto& m_heightmap = m_chunk.heightmap();
+    for (int x = 0; x < CHUCK_SIZE; x++) {
+        for (int z = 0; z < CHUCK_SIZE; z++) {
+            int height = static_cast<int>(m_heightmap[x][z]);
+            for (int y = 5; y < height - 5; y++) {
+                m_blocks[Chunk::get_index(x, y, z)] = 3;
+            }
+            for (int y = height - 5; y <= height - 1; y++) {
+                m_blocks[Chunk::get_index(x, y, z)] = 2;
+            }
+            for (int y = height; y <= height; y++) {
+                if (y >= SEA_LEVEL - 1) {
+                    m_blocks[Chunk::get_index(x, y, z)] = 1;
+                } else {
+                    m_blocks[Chunk::get_index(x, y, z)] = 2;
+                }
+            }
+        }
+    }
+}
+
+void RiverBuilder::build_vegetation() {
+    auto& m_chunk = m_chunk_generator.chunk();
+    auto& m_blocks = m_chunk.blocks();
+    auto& m_heightmap = m_chunk.heightmap();
+    for (int x = 0; x < SIZE_X; x++) {
+        for (int z = 0; z < SIZE_Z; z++) {
+            int height = static_cast<int>(m_heightmap[x][z]);
+            if (height >= SEA_LEVEL) {
+                continue;
+            }
+            for (int y = height + 1; y < SEA_LEVEL; y++) {
+                m_blocks[Chunk::get_index(x, y, z)] = 7;
+            }
+        }
+    }
+}
+
+ChunkGenerator& RiverBuilder::get_chunk_generator() {
+    return m_chunk_generator;
+};
+
+} // namespace Cubed