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Fix --geometry producing wrong results

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This commit is contained in:
sfan5 2014-09-01 18:37:07 +02:00
parent 88df29a6b3
commit b7f0a8a29a
1 changed files with 21 additions and 33 deletions
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54
TileGenerator.cpp
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@ -39,6 +39,18 @@ static inline int color2int(Color c)
return rgb2int(c.r, c.g, c.b, c.a); return rgb2int(c.r, c.g, c.b, c.a);
} }
// rounds n (upwards) to a multiple of f while preserving the sign-bit of n
static inline int round_multiple_nosign(int n, int f)
{
int nn, ns;
nn = (n >= 0) ? n : -n;
ns = (n >= 0) ? 1 : -1;
if (nn % f == 0)
return n; // n == nn * ns
else
return ns * (n + f - (n % f));
}
static inline int readBlockContent(const unsigned char *mapData, int version, int datapos) static inline int readBlockContent(const unsigned char *mapData, int version, int datapos)
{ {
if (version >= 24) { if (version >= 24) {
@ -105,10 +117,10 @@ TileGenerator::TileGenerator():
m_zMax(INT_MIN), m_zMax(INT_MIN),
m_yMin(-30000), m_yMin(-30000),
m_yMax(30000), m_yMax(30000),
m_geomX(INT_MIN), m_geomX(-2048),
m_geomY(INT_MIN), m_geomY(-2048),
m_geomX2(INT_MAX), m_geomX2(2048),
m_geomY2(INT_MAX) m_geomY2(2048)
{ {
} }
@ -189,34 +201,10 @@ void TileGenerator::setBackend(std::string backend)
void TileGenerator::setGeometry(int x, int y, int w, int h) void TileGenerator::setGeometry(int x, int y, int w, int h)
{ {
if (x > 0) { m_geomX = round_multiple_nosign(x, 16) / 16;
m_geomX = x / 16; m_geomY = round_multiple_nosign(y, 16) / 16;
} m_geomX2 = round_multiple_nosign(x + w, 16) / 16;
else { m_geomY2 = round_multiple_nosign(y + h, 16) / 16;
m_geomX = (x - 15) / 16;
}
if (y > 0) {
m_geomY = y / 16;
}
else {
m_geomY = (y - 15) / 16;
}
int x2 = x + w;
int y2 = y + h;
if (x2 > 0) {
m_geomX2 = x2 / 16;
}
else {
m_geomX2 = (x2 - 15) / 16;
}
if (y2 > 0) {
m_geomY2 = y2 / 16;
}
else {
m_geomY2 = (y2 - 15) / 16;
}
} }
void TileGenerator::setMinY(int y) void TileGenerator::setMinY(int y)
@ -319,7 +307,7 @@ void TileGenerator::loadBlocks()
for (std::vector<BlockPos>::iterator it = vec.begin(); it != vec.end(); ++it) { for (std::vector<BlockPos>::iterator it = vec.begin(); it != vec.end(); ++it) {
BlockPos pos = *it; BlockPos pos = *it;
// Check that it's in geometry (from --geometry option) // Check that it's in geometry (from --geometry option)
if (pos.x < m_geomX || pos.x > m_geomX2 || pos.z < m_geomY || pos.z > m_geomY2) { if (pos.x < m_geomX || pos.x >= m_geomX2 || pos.z < m_geomY || pos.z >= m_geomY2) {
continue; continue;
} }
// Check that it's between --miny and --maxy // Check that it's between --miny and --maxy