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Optimized selection of blocks.

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This commit is contained in:
Miroslav Bendík 2012-08-24 08:31:31 +02:00
parent ace6f3b5b5
commit 1dc09c4830
1 changed files with 12 additions and 7 deletions
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19
TileGenerator.cpp
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@ -227,20 +227,25 @@ void TileGenerator::createImage()
void TileGenerator::renderMap() void TileGenerator::renderMap()
{ {
sqlite3_stmt *statement; sqlite3_stmt *statement;
string sql = "SELECT pos FROM blocks WHERE pos >= ? AND pos <= ? AND (pos - ?) % 4096 = 0"; //string sql = "SELECT pos, data FROM blocks WHERE pos >= ? AND pos <= ? AND (pos - ?) % 4096 = 0";
string sql = "SELECT pos, data FROM blocks WHERE pos >= ? AND pos <= ?";
std::list<int> zlist;
for (std::list<std::pair<int, int> >::iterator position = m_positions.begin(); position != m_positions.end(); ++position) {
zlist.push_back(position->second);
}
zlist.sort();
zlist.unique();
if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) != SQLITE_OK) { if (sqlite3_prepare_v2(m_db, sql.c_str(), sql.length(), &statement, 0) != SQLITE_OK) {
throw DbError(); throw DbError();
} }
for (auto position = m_positions.begin(); position != m_positions.end(); ++position) { for (std::list<int>::iterator position = zlist.begin(); position != zlist.end(); ++position) {
int xPos = position->first; int zPos = *position;
int zPos = position->second;
sqlite3_int64 psMin = encodeBlockPos(xPos, -2048, zPos); sqlite3_int64 psMin = encodeBlockPos(-2048, -2048, zPos);
sqlite3_int64 psMax = encodeBlockPos(xPos, 2047, zPos); sqlite3_int64 psMax = encodeBlockPos( 2047, 2047, zPos);
sqlite3_bind_int64(statement, 1, psMin); sqlite3_bind_int64(statement, 1, psMin);
sqlite3_bind_int64(statement, 2, psMax); sqlite3_bind_int64(statement, 2, psMax);
sqlite3_bind_int64(statement, 3, psMin);
int result = 0; int result = 0;
while (true) { while (true) {
result = sqlite3_step(statement); result = sqlite3_step(statement);