public Color renderPixel(Scene scene, Camera cam, float x_, float y_)
{
if (1 == m_iMultiSamples)
{
return(RayTracer.TraceRay(cam.Pos, cam.PerspectiveRayDir(x_, y_), scene, 0));
}
Color color = Color.Black();
float delta = 1.0f / ((float)Math.Sqrt(m_iMultiSamples));
int count = 0;
for (float x = x_ - 0.5f; x < x_ + 0.5f; x += delta)
{
for (float y = y_ - 0.5f; y < y_ + 0.5f; y += delta)
{
color += RayTracer.TraceRay(cam.Pos, cam.PerspectiveRayDir(x, y), scene, 0);
++count;
}
}
return(color * (1.0f / m_iMultiSamples));
}
private void RenderLoop(object boxedToken)
{
var cancellationToken = (CancellationToken)boxedToken;
// Create a ray tracer, and create a reference to "sphere2" that we are going to bounce
var rayTracer = new RayTracer(_width, _height);
var scene = rayTracer._defaultScene;
var sphere2 = (Sphere)scene.Things[0]; // The first item is assumed to be our sphere
var baseY = sphere2.Radius;
sphere2.Center.Y = sphere2.Radius;
// Timing determines how fast the ball bounces as well as diagnostics frames/second info
var renderingTime = new Stopwatch();
var totalTime = Stopwatch.StartNew();
// Keep rendering until the rendering task has been canceled
while (!cancellationToken.IsCancellationRequested)
{
// Get the next buffer
var rgb = _freeBuffers.GetObject();
// Determine the new position of the sphere based on the current time elapsed
double dy2 = 0.8 * Math.Abs(Math.Sin(totalTime.ElapsedMilliseconds * Math.PI / 3000));
sphere2.Center.Y = baseY + dy2;
// Render the scene
renderingTime.Reset();
renderingTime.Start();
var options = new ParallelOptions
{
MaxDegreeOfParallelism = _degreeOfParallelism,
CancellationToken = _cancellation.Token
};
if (!_isParallel)
{
rayTracer.RenderSequential(scene, rgb);
}
else if (_showThreads)
{
rayTracer.RenderParallelShowingThreads(scene, rgb, options);
}
else
{
rayTracer.RenderParallel(scene, rgb, options);
}
renderingTime.Stop();
// Update the bitmap in the UI thread
//var framesPerSecond = (++frame * 1000.0 / renderingTime.ElapsedMilliseconds);
var framesPerSecond = 1000.0 / renderingTime.ElapsedMilliseconds;
BeginInvoke((Action) delegate
{
// Copy the pixel array into the bitmap
var bmpData = _bitmap.LockBits(_rect, ImageLockMode.WriteOnly, _bitmap.PixelFormat);
Marshal.Copy(rgb, 0, bmpData.Scan0, rgb.Length);
_bitmap.UnlockBits(bmpData);
_freeBuffers.PutObject(rgb);
// Refresh the UI
_renderedImage.Invalidate();
Text = $"Ray Tracer - FPS: {framesPerSecond:F1}";
});
}
}