static void Main(string[] args)
{
for (var i = 0; i < 100; i++)
{
var num = i / 10f;
var a = MathF.Sqrt(num);
var b = MathHelpres.FastSqrt(num);
Console.WriteLine($"{num}: {a} vs {b}");
}
for (var i = 0; i < 100; i++)
{
var num = i / 10.0;
var a = Math.Sqrt(num);
var b = MathHelpres.FastSqrt(num);
Console.WriteLine($"{num}: {a} vs {b}");
}
//BenchmarkRunner.Run<Md5_Sha256>();
BenchmarkRunner.Run <Sqrt_FastSqrt>();
Console.ReadKey();
}
public override bool GetIntersection(Ray ray, double maxDistance, out Hit hit, out double distance)
{
hit = new Hit();
var delta = ray.Origin - Position;
var a = Dot(ray.Direction, ray.Direction);
var b = 2 * Dot(ray.Direction, delta);
var c = Dot(delta, delta) - Radius * Radius;
double dt = b * b - 4 * a * c;
if (dt < 0)
{
distance = 0;
return(false);
}
else
{
double D = (-b - MathHelpres.FastSqrt(dt)) / (a * 2);
if (D < 0)
{
distance = 0;
return(false);
}
var position = ray.Origin + ray.Direction * (float)D;
var dist = Distance(position, ray.Origin);
if (dist > maxDistance)
{
distance = dist;
return(false);
}
hit.Position = position;
hit.Normal = CalcNormal(hit.Position);
hit.HitObject = this;
distance = dist;
return(hit.IsHitting);
}
}
public double FastInvSqrt64() => MathHelpres.QuakeInvSqrt(_double);
public double FastSqrt64() => MathHelpres.FastSqrt(_double);
public float FastInvSqrt32() => MathHelpres.QuakeInvSqrt(_single);
public float FastSqrt32() => MathHelpres.FastSqrt(_single);
private Color TracePath(RenderContext context, Camera camera, Ray ray, Color back, int depth = 0, Shape currentShape = null)
{
// Bounced enough times
if (depth >= camera.MaxBounceDepth)
{
return(back);
}
var maxDistance = camera.MaxDistance;
var hit = FindClosestHit(ray, maxDistance, currentShape);
if (!hit.IsHitting)
{
return(back); // Nothing was hit
}
var material = hit.HitObject.Material;
var emittance = material.Color; //material.emittance;
var position = hit.Position;
var normal = hit.Normal;
if (Mode == RenderMode.Depth)
{
var dist = Distance(hit.Position, ray.Origin);
var rate = 1 - (dist / maxDistance);
rate = MathHelpres.Clamp(rate, 0, 1);
rate *= rate;
return(new Color(rate, rate, rate));
}
if (Mode == RenderMode.Normals)
{
var x = normal.x;
var y = normal.y;
var z = normal.z;
if (x < 0)
{
x *= -0.5f;
}
if (y < 0)
{
y *= -0.5f;
}
if (z < 0)
{
z *= -0.5f;
}
return(new Color(x, y, z));
}
if (hit.HitObject.Light != null)
{
return(emittance);
}
if (Scene.LightingEnabled)
{
emittance = Enlight(emittance, hit);
}
if (material.Refraction > 0)
{
var newRayDirection = Refract(ray.Direction, normal, material.RefractionEta);
var newRay = new Ray(position, newRayDirection);
var incoming = TracePath(context, camera, newRay, back, depth + 1, hit.HitObject);
var refractedColor = incoming; //emittance * incoming;
emittance = Color.Lerp(emittance, refractedColor, material.Refraction);
}
if (material.Reflection > 0)
{
var newRayDirection = Reflect(ray.Direction, normal);
var newRay = new Ray(position, newRayDirection);
var BRDF = material.Specular / (float)Math.PI;
var incoming = TracePath(context, camera, newRay, back, depth + 1, currentShape);
var reflectedColor = !material.IsMetallic
? emittance + (BRDF * incoming)
: incoming;
emittance = Color.Lerp(emittance, reflectedColor, material.Reflection);
}
return(emittance);
}
protected override void RenderScreen(RenderContext context)
{
var width = context.Width;
var height = context.Height;
var scale = context.Scale;
var dispatcher = context.Dispatcher;
var camera = MainCamera;
var samples = 4;
var samplesWidth = width * samples;
var samplesHeight = height * samples;
float fovScale = (float)Math.Tan(MathHelpres.DegToRad(camera.FOV * 0.5));
float aspectRatio = (float)width / height;
Vector3 orig = camera.Position;
float halfX = width / 2;
float halfY = height / 2;
Color[,] BatchPreview(int ix, int iy, int sizeX, int sizeY)
{
var tile = RenderBatch(ix, iy, sizeX, sizeY, (int)(8 * scale));
return(tile);
}
Color[,] Batch(int ix, int iy, int sizeX, int sizeY)
{
var tile = RenderBatch(ix, iy, sizeX, sizeY, 1);
return(tile);
}
Color[,] RenderBatch(int ix, int iy, int sizeX, int sizeY, int step)
{
var tile = new Color[sizeX, sizeY];
for (int localY = 0; localY < sizeY; localY += step)
{
int y = iy + localY;
for (int localX = 0; localX < sizeX; localX += step)
{
int x = ix + localX;
//
float posX = (2 * (x + 0.5f) / width - 1) * aspectRatio * fovScale;
float posY = (1 - 2 * (y + 0.5f) / height) * fovScale;
//
var dir = Normalize(new Vector3(posX, posY, -1));
var ray = new Ray(orig, dir);
//
var color = TracePath(context, camera, ray, Scene.BackgroundColor);
tile[localX, localY] = color;
}
}
if (step > 1)
{
for (int localY = 0; localY < sizeY; localY += step)
{
for (int localX = 0; localX < sizeX; localX += step)
{
var template = tile[localX, localY];
for (var y = localY; y < localY + step && y < sizeY; y++)
{
for (var x = localX; x < localX + step && x < sizeX; x++)
{
tile[x, y] = template;
}
}
}
}
}
return(tile);
}
lock (camera)
{
lock (Scene)
{
BatchScreen(context, BatchPreview);
BatchScreen(context, Batch);
}
}
}
