///////////////////////////////////////
-int MapgenV7::getGroundLevelAtPoint(v2s16 p)
+int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
{
// Base terrain calculation
s16 y = baseTerrainLevelAtPoint(p.X, p.Y);
// Ridge/river terrain calculation
float width = 0.2;
float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
- // actually computing the depth of the ridge is much more expensive;
- // if inside a river, simply guess
+ // if inside a river this is an unsuitable spawn point
if (fabs(uwatern) <= width)
- return water_level - 10;
+ return MAX_MAP_GENERATION_LIMIT;
// Mountain terrain calculation
- int iters = 128; // don't even bother iterating more than 128 times..
+ int iters = 128;
while (iters--) {
- //current point would have been air
- if (!getMountainTerrainAtPoint(p.X, y, p.Y))
- return y;
-
+ if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) { // Air, y is ground level
+ if (y <= water_level || y > water_level + 16)
+ return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
+ else
+ return y;
+ }
y++;
}
- return y;
+ // Unsuitable spawn point, no ground surface found
+ return MAX_MAP_GENERATION_LIMIT;
}
void MapgenV7::calculateNoise()
{
//TimeTaker t("calculateNoise", NULL, PRECISION_MICRO);
- int x = node_min.X;
- int y = node_min.Y - 1;
- int z = node_min.Z;
+ s16 x = node_min.X;
+ s16 y = node_min.Y - 1;
+ s16 z = node_min.Z;
noise_terrain_persist->perlinMap2D(x, z);
float *persistmap = noise_terrain_persist->result;
noise_terrain_alt->perlinMap2D(x, z, persistmap);
noise_height_select->perlinMap2D(x, z);
- if (flags & MG_CAVES) {
- noise_cave1->perlinMap3D(x, y, z);
- noise_cave2->perlinMap3D(x, y, z);
- }
-
if ((spflags & MGV7_RIDGES) && node_max.Y >= water_level) {
noise_ridge->perlinMap3D(x, y, z);
noise_ridge_uwater->perlinMap2D(x, z);
}
+ // Cave noises are calculated in generateCaves()
+ // only if solid terrain is present in mapchunk
+
// Mountain noises are calculated in generateMountainTerrain()
+ // only if solid terrain surface dips into mapchunk
noise_filler_depth->perlinMap2D(x, z);
noise_heat->perlinMap2D(x, z);
if (surface_y > surface_max_y)
surface_max_y = surface_y;
- u32 i = vm->m_area.index(x, node_min.Y - 1, z);
+ u32 vi = vm->m_area.index(x, node_min.Y - 1, z);
for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
- if (vm->m_data[i].getContent() == CONTENT_IGNORE) {
+ if (vm->m_data[vi].getContent() == CONTENT_IGNORE) {
if (y <= surface_y)
- vm->m_data[i] = n_stone;
+ vm->m_data[vi] = n_stone;
else if (y <= water_level)
- vm->m_data[i] = n_water;
+ vm->m_data[vi] = n_water;
else
- vm->m_data[i] = n_air;
+ vm->m_data[vi] = n_air;
}
- vm->m_area.add_y(em, i, 1);
+ vm->m_area.add_y(em, vi, 1);
}
}
MapNode n_water(c_water_source);
MapNode n_air(CONTENT_AIR);
u32 index = 0;
- float width = 0.2; // TODO: figure out acceptable perlin noise values
+ float width = 0.2;
for (s16 z = node_min.Z; z <= node_max.Z; z++)
for (s16 y = node_min.Y - 1; y <= node_max.Y + 1; y++) {
void MapgenV7::generateCaves(s16 max_stone_y)
{
- if (max_stone_y >= node_min.Y) {
- v3s16 em = vm->m_area.getExtent();
- u32 index2d = 0;
- u32 index3d;
-
- for (s16 z = node_min.Z; z <= node_max.Z; z++)
- for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
- bool open = false; // Is column open to overground
- u32 vi = vm->m_area.index(x, node_max.Y + 1, z);
- index3d = (z - node_min.Z) * zstride + (csize.Y + 1) * ystride +
- (x - node_min.X);
- // Biome of column
- Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
-
- for (s16 y = node_max.Y + 1; y >= node_min.Y - 1;
- y--, index3d -= ystride, vm->m_area.add_y(em, vi, -1)) {
- content_t c = vm->m_data[vi].getContent();
- if (c == CONTENT_AIR || c == biome->c_water_top ||
- c == biome->c_water) {
- open = true;
- continue;
- }
- // Ground
- float d1 = contour(noise_cave1->result[index3d]);
- float d2 = contour(noise_cave2->result[index3d]);
- if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
- // In tunnel and ground content, excavate
- vm->m_data[vi] = MapNode(CONTENT_AIR);
- } else if (open && (c == biome->c_filler || c == biome->c_stone)) {
- // Tunnel entrance floor
- vm->m_data[vi] = MapNode(biome->c_top);
- open = false;
- } else {
- open = false;
- }
+ if (max_stone_y < node_min.Y)
+ return;
+
+ noise_cave1->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
+ noise_cave2->perlinMap3D(node_min.X, node_min.Y - 1, node_min.Z);
+
+ v3s16 em = vm->m_area.getExtent();
+ u32 index2d = 0;
+
+ for (s16 z = node_min.Z; z <= node_max.Z; z++)
+ for (s16 x = node_min.X; x <= node_max.X; x++, index2d++) {
+ bool column_is_open = false; // Is column open to overground
+ u32 vi = vm->m_area.index(x, node_max.Y + 1, z);
+ u32 index3d = (z - node_min.Z) * zstride + (csize.Y + 1) * ystride +
+ (x - node_min.X);
+ // Biome of column
+ Biome *biome = (Biome *)bmgr->getRaw(biomemap[index2d]);
+
+ for (s16 y = node_max.Y + 1; y >= node_min.Y - 1;
+ y--, index3d -= ystride, vm->m_area.add_y(em, vi, -1)) {
+ content_t c = vm->m_data[vi].getContent();
+ if (c == CONTENT_AIR || c == biome->c_water_top ||
+ c == biome->c_water) {
+ column_is_open = true;
+ continue;
+ }
+ // Ground
+ float d1 = contour(noise_cave1->result[index3d]);
+ float d2 = contour(noise_cave2->result[index3d]);
+ if (d1 * d2 > 0.3f && ndef->get(c).is_ground_content) {
+ // In tunnel and ground content, excavate
+ vm->m_data[vi] = MapNode(CONTENT_AIR);
+ } else if (column_is_open &&
+ (c == biome->c_filler || c == biome->c_stone)) {
+ // Tunnel entrance floor
+ vm->m_data[vi] = MapNode(biome->c_top);
+ column_is_open = false;
+ } else {
+ column_is_open = false;
}
}
}
projects / minetest.git / blobdiff