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update ore generation

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p2r3
2025-08-31 22:23:19 +03:00
parent d608014470
commit 6bef88f60d
4 changed files with 89 additions and 62 deletions
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43
src/worldgen.c
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@@ -270,25 +270,38 @@ skip_feature:
int8_t gap = height - TERRAIN_BASE_HEIGHT;
if (y < CAVE_BASE_DEPTH + gap && y > CAVE_BASE_DEPTH - gap) return B_air;
// The chunk-relative X and Z coordinates are used in a bit shift on the hash
// The sum of these is then used to get the Y coordinate of the ore in this column
// This way, each column is guaranteed to have exactly one ore candidate
uint8_t ore_x_component = (anchor.hash >> rx) & 31;
uint8_t ore_z_component = (anchor.hash >> (rz + 16)) & 31;
uint8_t ore_y = ore_x_component + ore_z_component;
// The chunk-relative X and Z coordinates are used as the seed for an
// xorshift RNG/hash function to generate the Y coordinate of the ore
// in this column. This way, each column is guaranteed to have exactly
// one ore candidate, as there will always be a Y value to reference.
uint8_t ore_y = ((rx & 15) << 4) + (rz & 15);
ore_y ^= ore_y << 4;
ore_y ^= ore_y >> 5;
ore_y ^= ore_y << 1;
ore_y &= 63;
if (y == ore_y) {
// Since the ore Y coordinate is effectely a random number in range [0;64],
// we use it in another bit shift to get a pseudo-random number for the column
uint8_t ore_probability = (anchor.hash >> ore_y) & 255;
// Since the ore Y coordinate is effectely a random number in range [0;64),
// we use it in a bit shift with the chunk's anchor hash to get another
// pseudo-random number for the ore's rarity.
uint8_t ore_probability = (anchor.hash >> (ore_y % 24)) & 255;
// Ore placement is determined by Y level and "probability"
if (y < 15 && ore_probability < 15) return B_diamond_ore;
if (y < 30) {
if (ore_probability < 5) return B_gold_ore;
if (ore_probability < 20) return B_redstone_ore;
if (y < 15) {
if (ore_probability < 10) return B_diamond_ore;
if (ore_probability < 12) return B_gold_ore;
if (ore_probability < 15) return B_redstone_ore;
}
if (y < 30) {
if (ore_probability < 3) return B_gold_ore;
if (ore_probability < 8) return B_redstone_ore;
}
if (y < 54) {
if (ore_probability < 30) return B_iron_ore;
if (ore_probability < 40) return B_copper_ore;
}
if (y < 54 && ore_probability < 50) return B_iron_ore;
if (ore_probability < 60) return B_coal_ore;
if (y < 5) return B_lava;
return B_cobblestone;
}
// For everything else, fall back to stone
@@ -363,6 +376,8 @@ uint8_t getTerrainAt (int x, int y, int z, ChunkAnchor anchor) {
uint8_t getBlockAt (int x, int y, int z) {
if (y < 0) return B_bedrock;
uint8_t block_change = getBlockChange(x, y, z);
if (block_change != 0xFF) return block_change;