void TinyGameLibrary::mainLoop()
{
m_run = true;
while (m_run) {
SDL_RenderClear(m_renderer);
readKeys();
moveObjects();
renderLevel();
SDL_RenderPresent(m_renderer);
SDL_Delay(1000 / 30);
}
}
//-----------------------------------------------------------------------
// Loop over every edge tile. Determine which the lowest lod on each edge
// and use that to adjust the extents.
// TODO: This routine is expensive, and is only needed when LOD is involved.
// Optimize? Ironic since LOD is supposed to make things faster.
void AdjustEdgesForLod( LodTracker& lodTracker,
int minPageX, int minPageZ, int maxPageX, int maxPageZ,
int& localPageMinX, int& localPageMinZ, int& localPageMaxX, int& localPageMaxZ )
{
int minTileZ = PageToTile( localPageMinZ,
lodTracker.GetInvTileSize(),
lodTracker.GetMaxNumTiles() );
int maxTileZ = PageToTile( localPageMaxZ,
lodTracker.GetInvTileSize(),
lodTracker.GetMaxNumTiles() );
int minTileX = PageToTile( localPageMinX,
lodTracker.GetInvTileSize(),
lodTracker.GetMaxNumTiles() );
int maxTileX = PageToTile( localPageMaxX,
lodTracker.GetInvTileSize(),
lodTracker.GetMaxNumTiles() );
int westRenderLevel = 0;
int eastRenderLevel = 0;
for( int pageZ = minPageZ; pageZ <= maxPageZ; ++pageZ )
{
int endTileZ = ( pageZ == maxPageZ ) ? maxTileZ : lodTracker.GetMaxNumTiles() - 1;
for( int tileZ = ( pageZ == minPageZ ) ? minTileZ : 0;
tileZ <= endTileZ;
++tileZ )
{
// West edge
lodTracker.SetPage( minPageX, pageZ );
lodTracker.UpdateTile( minTileX, tileZ );
int renderLevel = lodTracker.GetRenderLevel().GetRenderLevel();
if( renderLevel > westRenderLevel )
westRenderLevel = renderLevel;
// East edge
lodTracker.SetPage( maxPageX, pageZ );
lodTracker.UpdateTile( maxTileX, tileZ );
renderLevel = lodTracker.GetRenderLevel().GetRenderLevel();
if( renderLevel > eastRenderLevel )
eastRenderLevel = renderLevel;
}
}
int northRenderLevel = 0;
int southRenderLevel = 0;
for( int pageX = minPageX; pageX <= maxPageX; ++pageX )
{
int endTileX = ( pageX == maxPageX ) ? maxTileX : lodTracker.GetMaxNumTiles() - 1;
for( int tileX = ( pageX == minPageX ) ? minTileX : 0;
tileX <= endTileX;
++tileX )
{
// North edge
lodTracker.SetPage( pageX, minPageZ );
lodTracker.UpdateTile( tileX, minTileZ );
int renderLevel = lodTracker.GetRenderLevel().GetRenderLevel();
if( renderLevel > northRenderLevel )
northRenderLevel = renderLevel;
// South edge
lodTracker.SetPage( pageX, maxPageZ );
lodTracker.UpdateTile( tileX, maxTileZ );
renderLevel = lodTracker.GetRenderLevel().GetRenderLevel();
if( renderLevel > southRenderLevel )
southRenderLevel = renderLevel;
}
}
// Use the lods we found to adjust the min and max local coords.
RenderLevel renderLevel( westRenderLevel );
localPageMinX = renderLevel.Floor( localPageMinX );
renderLevel.SetRenderLevel( eastRenderLevel );
localPageMaxX = renderLevel.Ceil( localPageMaxX );
renderLevel.SetRenderLevel( northRenderLevel );
localPageMinZ = renderLevel.Floor( localPageMinZ );
renderLevel.SetRenderLevel( southRenderLevel );
localPageMaxZ = renderLevel.Ceil( localPageMaxZ );
}
