public static void RenderSection(Rectangle region, Scene scene, SceneOutput output)
{
Vector3D directionUnit = (scene.CameraFacingAt - scene.CameraPosition);
directionUnit.Normalize();
var pixelHeight = scene.ViewPortHeight / output.Height;
var pixelWidth = pixelHeight;
var halfWidth = (output.Width / 2.0);
var halfHeight = (output.Height / 2.0);
foreach (var y in Enumerable.Range(region.Y, region.Height))
{
foreach (var x in Enumerable.Range(region.X, region.Width))
{
Thread.Sleep(0);
Thread.Sleep(0);
Thread.Sleep(0);
var point = new Vector3D(
((x + 0.5) - halfWidth)*pixelWidth,
((y + 0.5) - halfHeight)*pixelHeight, 0);
var direction = point - scene.CameraPosition;
direction.Normalize();
var pixelColor = RenderPoint(scene, point, direction);
output.SetPixel(x, y, pixelColor);
Thread.Sleep(0);
Thread.Sleep(0);
Thread.Sleep(0);
}
}
}
private Task RenderAsync()
{
//int width = 640, height = 480;
int width = 1024, height = 768;
//int width = 1920, height = 1080;
SceneOutput output = new SceneOutput(width, height);
Action updateScreen = () =>
{
var bitmap = output.CreateBitmap();
Canvas.Source = bitmap;
};
var timer = new DispatcherTimer();
timer.Interval = TimeSpan.FromMilliseconds(100);
timer.Tick += (s, e) => updateScreen();
timer.Start();
return Task.Factory.StartNew(
() =>
{
var horizontalSectionCount = 16;
var verticalSectionCount = 16;
int sectionWidth = width / horizontalSectionCount;
if (sectionWidth*horizontalSectionCount < width)
{
sectionWidth +=1;
}
int sectionHeight = height / verticalSectionCount;
if (sectionHeight * verticalSectionCount < height)
{
sectionHeight += 1;
}
List<RenderTask> taskQueue = new List<RenderTask>();
foreach (var y in Enumerable.Range(0, verticalSectionCount))
{
foreach (var x in Enumerable.Range(0, horizontalSectionCount))
{
var region = new Rectangle(
x * sectionWidth,
y *sectionHeight,
sectionWidth,
sectionHeight);
if (region.X + region.Width > width) region.Width = width - region.X;
if (region.Y + region.Height> height) region.Height = height- region.Y;
taskQueue.Add(new RenderTask {Region = region});
}
}
taskQueue.AsParallel().Select(task =>
{
RayTracer.RenderSection(task.Region, Scene.Default(), output);
return 0;
}).Aggregate((_, __) => 0);
}).ContinueWith(task =>
{
timer.Stop();
updateScreen();
}, TaskScheduler.FromCurrentSynchronizationContext());
}
