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Mgv7: Avoid mid-air spawn on disabled mountain terrain, optimise function 

'getSpawnLevelAtPoint()' did not account for disabled mountains, it
was possible to be spawned in mid-air where a mountain surface would
have been.

Avoid check for river area if rivers are disabled.
This commit is contained in:
paramat 2016-09-26 23:21:33 +01:00
parent 33a606c034
commit 56ea77ea96
1 changed files with 18 additions and 8 deletions
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26
src/mapgen_v7.cpp
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@ -154,17 +154,27 @@ 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;
// if inside a river this is an unsuitable spawn point
if (fabs(uwatern) <= width)
return MAX_MAP_GENERATION_LIMIT;
// If enabled, check if inside a river
if (spflags & MGV7_RIDGES) {
float width = 0.2;
float uwatern = NoisePerlin2D(&noise_ridge_uwater->np, p.X, p.Y, seed) * 2;
if (fabs(uwatern) <= width)
return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
}
// If mountains are disabled, terrain level is base terrain level
// Avoids spawn on non-existant mountain terrain
if (!(spflags & MGV7_MOUNTAINS)) {
if (y <= water_level || y > water_level + 16)
return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
else
return y;
}
// Mountain terrain calculation
int iters = 128;
while (iters--) {
if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) { // Air, y is ground level
if (!getMountainTerrainAtPoint(p.X, y + 1, p.Y)) { // If air above
if (y <= water_level || y > water_level + 16)
return MAX_MAP_GENERATION_LIMIT; // Unsuitable spawn point
else
@ -173,7 +183,7 @@ int MapgenV7::getSpawnLevelAtPoint(v2s16 p)
y++;
}
// Unsuitable spawn point, no ground surface found
// Unsuitable spawn point, no mountain surface found
return MAX_MAP_GENERATION_LIMIT;
}