Add worldgen sources

include/noise.h

@@ -0,0 +1,14 @@
+#ifndef WORLDGEN_NOISE_H
+#define WORLDGEN_NOISE_H
+
+#include <stdint.h>
+
+typedef struct {
+	int perm[512];
+} simplex_noise;
+
+void simplex_init(simplex_noise *noise, uint32_t seed);
+double simplex_noise2(simplex_noise *noise, double x, double y);
+double simplex_noise3(simplex_noise *noise, double x, double y, double z);
+
+#endif

include/worldgen.h

@@ -0,0 +1,41 @@
+#ifndef WORLDGEN_H
+#define WORLDGEN_H
+
+#include <stddef.h>
+#include <stdint.h>
+#include "noise.h"
+
+#define CHUNK_SIZE 16
+#define CHUNK_HEIGHT 256
+
+enum BlockId {
+	BLOCK_BEDROCK = 0,
+	BLOCK_STONE = 1,
+	BLOCK_DIRT = 2,
+	BLOCK_GRASS = 3,
+	BLOCK_WATER = 4,
+	BLOCK_AIR = 5,
+	BLOCK_OAK_LOG = 6,
+	BLOCK_OAK_LEAVES = 7,
+	BLOCK_BIRCH_LOG = 8,
+	BLOCK_BIRCH_LEAVES = 9,
+	BLOCK_COAL = 10
+};
+
+typedef struct {
+	int chunk_x;
+	int chunk_z;
+	uint16_t heightmap[CHUNK_SIZE][CHUNK_SIZE];
+	uint16_t blocks[CHUNK_HEIGHT][CHUNK_SIZE][CHUNK_SIZE];
+} chunk_data;
+
+typedef struct {
+	simplex_noise noise;
+	int sea_level;
+	int world_seed;
+} worldgen_ctx;
+
+void worldgen_init(worldgen_ctx *ctx, int world_seed, int sea_level);
+void worldgen_generate_chunk(worldgen_ctx *ctx, int chunk_x, int chunk_z, chunk_data *out);
+
+#endif