Added Superflat implementation.

pumpkin-world/src/world_gen/implementations/mod.rs

@@ -0,0 +1 @@
+pub mod superflat;

pumpkin-world/src/world_gen/implementations/superflat.rs

@@ -0,0 +1,48 @@
+use crate::{
+    biome::Biome,
+    block::BlockId,
+    coordinates::{BlockCoordinates, XZBlockCoordinates},
+    world_gen::{
+        generator::{BiomeGenerator, GeneratorInit, TerrainGenerator},
+        generic_generator::GenericGenerator,
+        Seed,
+    },
+};
+
+#[allow(dead_code)]
+pub type SuperflatGenerator = GenericGenerator<SuperflatBiomeGenerator, SuperflatTerrainGenerator>;
+
+pub(crate) struct SuperflatBiomeGenerator {}
+
+impl GeneratorInit for SuperflatBiomeGenerator {
+    fn new(_: Seed) -> Self {
+        Self {}
+    }
+}
+
+impl BiomeGenerator for SuperflatBiomeGenerator {
+    // TODO make generic over Biome and allow changing the Biome in the config.
+    fn generate_biome(&self, _: XZBlockCoordinates) -> Biome {
+        Biome::Plains
+    }
+}
+
+pub(crate) struct SuperflatTerrainGenerator {}
+
+impl GeneratorInit for SuperflatTerrainGenerator {
+    fn new(_: Seed) -> Self {
+        Self {}
+    }
+}
+
+impl TerrainGenerator for SuperflatTerrainGenerator {
+    // TODO allow specifying which blocks should be at which height in the config.
+    fn generate_block(&self, at: BlockCoordinates, _: Biome) -> BlockId {
+        match *at.y {
+            -64 => BlockId::from_id(79),       // Bedrock
+            -63..=-62 => BlockId::from_id(10), // Dirt
+            -61 => BlockId::from_id(9),        // Grass
+            _ => BlockId::AIR,
+        }
+    }
+}

pumpkin-world/src/world_gen/mod.rs

@@ -1,11 +1,16 @@
 mod generator;
 mod generic_generator;
+mod implementations;
 mod seed;
 
 pub use generator::WorldGenerator;
 pub use seed::Seed;
 
+use generator::GeneratorInit;
+use implementations::superflat::SuperflatGenerator;
+
 #[allow(dead_code)]
-pub fn get_world_gen(_: Seed) -> Box<dyn WorldGenerator> {
-    todo!()
+pub fn get_world_gen(seed: Seed) -> Box<dyn WorldGenerator> {
+    // TODO decide which WorldGenerator to pick based on config.
+    Box::new(SuperflatGenerator::new(seed))
 }