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Fix mapgen using unitialised height map values

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This commit is contained in:
Craig Robbins 2015-03-05 16:25:53 +10:00
parent 3d505b2b5f
commit daa1c30b35
5 changed files with 22 additions and 5 deletions
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20
src/mapgen.cpp
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@ -41,6 +41,8 @@ with this program; if not, write to the Free Software Foundation, Inc.,
const char *GenElementManager::ELEMENT_TITLE = "element";
static const s16 INVALID_HEIGHT = MAP_GENERATION_LIMIT + 1;
FlagDesc flagdesc_mapgen[] = {
{"trees", MG_TREES},
{"caves", MG_CAVES},
@ -155,6 +157,12 @@ s16 Mapgen::findGroundLevel(v2s16 p2d, s16 ymin, s16 ymax)
}
void Mapgen::initHeightMap(s16 *dest, size_t len)
{
for (size_t i = 0; i < len; i++)
dest[i] = INVALID_HEIGHT;
}
void Mapgen::updateHeightmap(v3s16 nmin, v3s16 nmax)
{
if (!heightmap)
@ -166,11 +174,13 @@ void Mapgen::updateHeightmap(v3s16 nmin, v3s16 nmax)
for (s16 x = nmin.X; x <= nmax.X; x++, index++) {
s16 y = findGroundLevel(v2s16(x, z), nmin.Y, nmax.Y);
// if the values found are out of range, trust the old heightmap
if (y == nmax.Y && heightmap[index] > nmax.Y)
continue;
if (y == nmin.Y - 1 && heightmap[index] < nmin.Y)
continue;
if (heightmap[index] != INVALID_HEIGHT) {
// if the values found are out of range, trust the old heightmap
if (y == nmax.Y && heightmap[index] > nmax.Y)
continue;
if (y == nmin.Y - 1 && heightmap[index] < nmin.Y)
continue;
}
heightmap[index] = y;
}