karussell

public static void calcPoints( double y1, double x1, double y2, double x2,
        PointEmitter emitter )
{
    int x = (int) x1, y = (int) y1;
    int endX = (int) x2, endY = (int) y2;

    // deltaX and Y is how far we have to move in ray direction until we find a new cell in x or y direction
    // y = u + t * v, where u=(x1,x2) and v=(stepX,stepY) is the direction vector
    final double gridCellWidth = 1, gridCellHeight = 1;

jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD