centralize configuration options

include/globals.h

@@ -40,6 +40,31 @@
 // Calculated from TIME_BETWEEN_TICKS
 #define TICKS_PER_SECOND ((float)1000000 / TIME_BETWEEN_TICKS)
 
+// Initial world generation seed, will be hashed on startup
+// Used in generating terrain and biomes
+#define INITIAL_WORLD_SEED 0xA103DE6C
+
+// Initial general RNG seed, will be hashed on startup
+// Used in random game events like item drops and mob behavior
+#define INITIAL_RNG_SEED 0xE2B9419
+
+// Size of each bilinearly interpolated area ("minichunk")
+// For best performance, CHUNK_SIZE should be a power of 2
+#define CHUNK_SIZE 8
+
+// Terrain low point - should start a bit below sea level for rivers/lakes
+#define TERRAIN_BASE_HEIGHT 60
+
+// Cave generation Y level
+#define CAVE_BASE_DEPTH 24
+
+// Size of every major biome in multiples of CHUNK_SIZE
+// For best performance, should also be a power of 2
+#define BIOME_SIZE (CHUNK_SIZE * 8)
+
+// Calculated from BIOME_SIZE
+#define BIOME_RADIUS (BIOME_SIZE / 2)
+
 // How many visited chunk coordinates to "remember"
 // The server will not re-send chunks that the player has recently been in
 #define VISITED_HISTORY 4

include/worldgen.h

@@ -3,17 +3,6 @@
 
 #include <stdint.h>
 
-// For best performance, CHUNK_SIZE should be a power of 2
-#define CHUNK_SIZE 8
-// Terrain low point - should start a bit below sea level for rivers/lakes
-#define TERRAIN_BASE_HEIGHT 60
-// Center point of cave generation
-#define CAVE_BASE_DEPTH 24
-// Size of every major biome in multiples of CHUNK_SIZE
-// For best performance, should also be a power of 2
-#define BIOME_SIZE 64
-#define BIOME_RADIUS (BIOME_SIZE / 2)
-
 typedef struct {
   short x;
   short z;

src/globals.c

@@ -26,8 +26,8 @@
 ssize_t recv_count;
 uint8_t recv_buffer[256] = {0};
 
-uint32_t world_seed = 0xA103DE6C;
+uint32_t world_seed = INITIAL_WORLD_SEED;
-uint32_t rng_seed = 0xE2B9419;
+uint32_t rng_seed = INITIAL_RNG_SEED;
 
 uint16_t world_time = 0;
 uint32_t server_ticks = 0;