private Vector3 CastPrimaryRay(Ray ray, Scene scene, int depth = 0)
{
foreach (Primitive p in scene.primitives)
{
p.Intersect(ray);
}
//Nu alleen nog de kleur van het object, geen shadow rays e.d.
if (ray.objectHit == null) //If no object has been hit load the skybox.
{
return Vector3.Zero;
}
if (ray.D.Y < .01f && ray.D.Y > -.01f)
{
if (depth != 0)
Debug.Rays.Add(ray);
}
Vector3 intersection = ray.GetPoint();
Vector3 color = ray.objectHit.GetTexture(intersection);
if (ray.objectHit.specular && depth < 20)
{
//Object is een spiegel, cast een tweede primary ray
Vector3 N = ray.objectHit.GetNormal(ray.GetPoint());
Vector3 R = ray.D - 2 * (Vector3.Dot(ray.D, N) * N);
Ray secondaryRay = new Ray(intersection, R, float.MaxValue);
return color * CastPrimaryRay(secondaryRay, scene, depth + 1);
}
//Object weerkaatst licht diffuus, cast shadowrays naar lampen OF max depth is gehaald en meer primary rays tekenen wordt te duur
return color * CastShadowRay(intersection, ray.objectHit, scene);
}
// initialize renderer: takes in command line parameters passed by template code
public void Init(int rt, bool gpu, int platformIdx)
{
// pass command line parameters
runningTime = rt;
useGPU = gpu;
gpuPlatform = platformIdx;
// initialize accumulator
accumulator = new Vector3[screen.width * screen.height];
ClearAccumulator();
// setup scene
scene = new Scene();
// setup camera
camera = new Camera(screen.width, screen.height);
schermVerdeling = new Vector4[schermDeler * schermDeler];
int index = 0;
widthd = screen.width / schermDeler;
heightd = screen.height / schermDeler;
for (int x = 0; x < schermDeler; x++)
{
for (int y = 0; y < schermDeler; y++)
{
schermVerdeling[index] = new Vector4(x * screen.width / schermDeler, (x + 1) * screen.width / schermDeler, y * screen.height / schermDeler, (y + 1) * screen.height / schermDeler);
index++;
}
}
InitGPU(platformIdx);
}
// initialize
public void Init(Rectangle bounds)
{
screen = new Surface(bounds.Width, bounds.Height);
camera = new Camera(bounds.Width, bounds.Height);
scene = new Scene();
Application.CreateApplication(camera, screen, scene, bounds);
Debug.CreateDebug(scene, screen);
}
// initialize renderer: takes in command line parameters passed by template code
public void Init(int rt, bool gpu, int platformIdx)
{
// pass command line parameters
runningTime = rt;
useGPU = gpu;
gpuPlatform = platformIdx;
// initialize accumulator
accumulator = new Vector3[screen.width * screen.height];
ClearAccumulator();
// setup scene
scene = new Scene();
// setup camera
camera = new Camera(screen.width, screen.height);
rngQueue = new ConcurrentQueue<Random>();
xtiles = (int)Math.Ceiling((float)screen.width / TILESIZE);
ytiles = (int)Math.Ceiling((float)screen.height / TILESIZE);
#if DEBUG
RTTools.factorials[0] = Vector<float>.One;
for (int i = 1; i < RTTools.TERMS * 2; i++)
RTTools.factorials[i] = RTTools.factorials[i - 1] * i;
//for (int i = 0; i < RTTools.TERMS; i++)
// RTTools.atanStuff[i] = (new Vector<float>((float)Math.Pow(2, 2 * i)) * (RTTools.factorials[i] * RTTools.factorials[i])) / RTTools.factorials[2 * i + 1];
#endif
#region OpenCL related things
randNums = new float[screen.width * screen.height + 25];
var streamReader = new StreamReader("../../assets/GPUCode.cl");
string clSource = streamReader.ReadToEnd();
streamReader.Close();
platform = ComputePlatform.Platforms[gpuPlatform];
context = new ComputeContext(ComputeDeviceTypes.Gpu,
new ComputeContextPropertyList(platform), null, IntPtr.Zero);
program = new ComputeProgram(context, clSource);
try
{
program.Build(null, null, null, IntPtr.Zero);
kernel = program.CreateKernel("Test");
}
catch
{
Console.Write("error in kernel code:\n");
Console.Write(program.GetBuildLog(context.Devices[0]) + "\n");
Debugger.Break();
}
eventList = new ComputeEventList();
commands = new ComputeCommandQueue(context, context.Devices[0], ComputeCommandQueueFlags.None);
#endregion
}
public void Render(Camera cam, Surface screen, Scene scene)
{
Parallel.For(0, screen.height, y =>
{
float hi = y / (float)screen.height;
for (int x = 0; x < (screen.width / 2); x++)
{
float wi = x / ((float)screen.width / 2);
RenderPixel(cam, screen, scene, hi, wi, x, y);
}
});
}
// initialize renderer: takes in command line parameters passed by template code
public void Init( int rt, bool gpu, int platformIdx )
{
// pass command line parameters
runningTime = rt;
useGPU = gpu;
gpuPlatform = platformIdx;
// initialize accumulator
accumulator = new Vector3[ screen.width * screen.height ];
ClearAccumulator();
// setup scene
scene = new Scene();
// setup camera
camera = new Camera( screen.width, screen.height );
}
//Constructor of the application.
static public void CreateApplication(Camera cam, Surface scr, Scene sce, Rectangle bound)
{
raytracer = new Raytracer();
camera = cam;
screen = scr;
scene = sce;
bounds = bound;
//Move the cursor to the middle of the screen and instantiate the variables to measure mouse movement.
Cursor.Position = new Point(bounds.Left + bounds.Width / 2, bounds.Top + bounds.Height / 2);
currentCursor = Cursor.Position;
previousCursor = Cursor.Position;
mouseDelta = Vector2.Zero;
}
public void RenderPixel(Camera cam, Surface screen, Scene scene, float hi, float wi, int x, int y)
{
Vector3[] points = cam.GetPoints;
Vector3 direction = new Vector3();
Vector3 result;
Ray ray;
if (AntiAlias)
{
float offX = 1 / 2f * 1 / screen.width;
float offY = 1 / 2f * 1 / screen.height;
Vector3 directionLB = points[0] + wi * (points[1] - points[0]) + hi * (points[2] - points[0]);
Vector3 directionRB = points[0] + (wi + offX) * (points[1] - points[0]) + hi * (points[2] - points[0]);
Vector3 directionLO = points[0] + wi * (points[1] - points[0]) + (hi + offY) * (points[2] - points[0]);
Vector3 directionRO = points[0] + (wi + offX) * (points[1] - points[0]) +
(hi + offY) * (points[2] - points[0]);
ray = new Ray(cam.Position, directionLB, float.MaxValue);
Ray ray2 = new Ray(cam.Position, directionRB, float.MaxValue);
Ray ray3 = new Ray(cam.Position, directionLO, float.MaxValue);
Ray ray4 = new Ray(cam.Position, directionRO, float.MaxValue);
Vector3 res1 = CastPrimaryRay(ray, scene);
Vector3 res2 = CastPrimaryRay(ray2, scene);
Vector3 res3 = CastPrimaryRay(ray3, scene);
Vector3 res4 = CastPrimaryRay(ray4, scene);
result = (res1 + res2 + res3 + res4) / 4;
}
else
{
direction = points[0] + wi * (points[1] - points[0]) + hi * (points[2] - points[0]);
ray = new Ray(cam.Position, direction, float.MaxValue);
result = CastPrimaryRay(ray, scene);
}
if (ray.D.Y < .01f && ray.D.Y > -.01f && x % 10 == 0)
{
Debug.Rays.Add(ray);
}
//screen.pixels[x + y * screen.width] = VectorToColor(CastPrimaryRay(ray, screen, scene, 0));
screen.pixels[x + y * screen.width] = VectorToColor(result);
}
bool useGPU = true; // GPU code enabled (from commandline)
#endregion Fields
#region Methods
// initialize renderer: takes in command line parameters passed by template code
public void Init( int rt, bool gpu, int platformIdx )
{
// pass command line parameters
runningTime = rt;
useGPU = gpu;
gpuPlatform = platformIdx;
// initialize accumulator
accumulator = new Vector3[screen.width * screen.height];
ClearAccumulator();
// setup scene
scene = new Scene();
// setup camera
camera = new Camera( screen.width, screen.height );
// Generate randoms
Console.Write("Generating randoms....\t");
randoms = new float[1000];
Random r = RTTools.GetRNG();
for (int i = 0; i < 1000; i++)
randoms[i] = (float)r.NextDouble();
int variable = r.Next();
Console.WriteLine("Done!");
// initialize required opencl things if gpu is used
if (useGPU)
{
StreamReader streamReader = new StreamReader("../../kernel.cl");
string clSource = streamReader.ReadToEnd();
streamReader.Close();
platform = ComputePlatform.Platforms[0];
context = new ComputeContext(ComputeDeviceTypes.Gpu, new ComputeContextPropertyList(platform), null, IntPtr.Zero);
queue = new ComputeCommandQueue(context, context.Devices[0], ComputeCommandQueueFlags.None);
program = new ComputeProgram(context, clSource);
try
{
program.Build(null, null, null, IntPtr.Zero);
kernel = program.CreateKernel("Main");
sceneBuffer = new ComputeBuffer<Vector4>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, scene.toCL());
rndBuffer = new ComputeBuffer<float>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, randoms);
cameraBuffer = new ComputeBuffer<Vector3>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, camera.toCL());
outputBuffer = new ComputeBuffer<int>(context, ComputeMemoryFlags.WriteOnly | ComputeMemoryFlags.UseHostPointer, screen.pixels);
skydome = new ComputeBuffer<float>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, scene.Skydome);
kernel.SetMemoryArgument(0, outputBuffer);
kernel.SetValueArgument(1, screen.width);
kernel.SetValueArgument(2, screen.height);
kernel.SetMemoryArgument(3, sceneBuffer);
kernel.SetValueArgument(4, scene.toCL().Length);
kernel.SetMemoryArgument(5, skydome);
kernel.SetMemoryArgument(6, cameraBuffer);
kernel.SetMemoryArgument(7, rndBuffer);
}
catch (ComputeException e) {
Console.WriteLine("Error in kernel code: {0}", program.GetBuildLog(context.Devices[0]));
Console.ReadLine();
useGPU = false;
}
}
else {
return;
}
}
private Vector3 CastShadowRay(Vector3 intersection, Primitive prim, Scene scene)
{
Vector3 light = new Vector3(0, 0, 0);
foreach (Light l in scene.lights)
{
//Richting van de ray is van lamp naar object
Vector3 toLight = intersection - l.pos;
float tmax = toLight.Length - 2 * Epsilon;
Ray shadowRay = new Ray(l.pos - toLight * Epsilon, toLight, float.MaxValue);
//Negatief, omdat de shadowray van lamp naar object gaat ipv andersom
Vector3 N = -1f * prim.GetNormal(intersection);
float incidence = Vector3.Dot(N, shadowRay.D);
if (incidence > 0)
{
foreach (Primitive p in scene.primitives)
{
p.Intersect(shadowRay);
//Als de ray iets raakt tussen de lamp en het object, abort mission
if (shadowRay.l < tmax)
{
break;
}
}
//Check of er geen objecten tussen de lamp en het object zitten
if (shadowRay.l >= tmax)
{
light += (l.color * (1 / (shadowRay.l * shadowRay.l))) * incidence;
}
}
}
foreach (Spotlight spot in scene.spots)
{
//Richting van de ray is van lamp naar object
Vector3 toLight = intersection - spot.pos;
float tmax = toLight.Length - 2 * Epsilon;
Ray shadowRay = new Ray(spot.pos - toLight * Epsilon, toLight, float.MaxValue);
//Negatief, omdat de shadowray van lamp naar object gaat ipv andersom
Vector3 N = -1f * prim.GetNormal(intersection);
float incidence = Vector3.Dot(N, shadowRay.D);
float incidenceOnSpot = Vector3.Dot(shadowRay.D, spot.D);
if (incidence > 0 && incidenceOnSpot > spot.minDot)
{
foreach (Primitive p in scene.primitives)
{
p.Intersect(shadowRay);
//Als de ray iets raakt tussen de lamp en het object, abort mission
if (shadowRay.l < tmax)
{
break;
}
}
//Check of er geen objecten tussen de lamp en het object zitten
if (shadowRay.l >= tmax)
{
light += (spot.color * (1 / (shadowRay.l * shadowRay.l))) * incidence;
}
}
}
return light;
}
// initialize renderer: takes in command line parameters passed by template code
public void Init(int rt, bool gpu, int platformIdx)
{
// pass command line parameters
runningTime = rt;
useGPU = gpu;
gpuPlatform = platformIdx;
//Determine tile width and height
tileCount = GreatestDiv(screen.width, screen.height);
tileWidth = screen.width/tileCount;
tileHeight = screen.height/tileCount;
// initialize accumulator
accumulator = new Vector3[screen.width * screen.height];
ClearAccumulator();
// setup scene
scene = new Scene();
// setup camera
camera = new Camera(screen.width, screen.height);
//Init OpenCL
ComputePlatform platform = ComputePlatform.Platforms[gpuPlatform];
context = new ComputeContext(
ComputeDeviceTypes.Gpu,
new ComputeContextPropertyList(platform),
null,
IntPtr.Zero
);
var streamReader = new StreamReader("../../program.cl");
string clSource = streamReader.ReadToEnd();
streamReader.Close();
ComputeProgram program = new ComputeProgram(context, clSource);
//try to compile
try
{
program.Build(null, null, null, IntPtr.Zero);
}
catch
{
Console.Write("error in kernel code:\n");
Console.Write(program.GetBuildLog(context.Devices[0]) + "\n");
}
kernel = program.CreateKernel("device_function");
//setup RNG
rngSeed = new int[screen.width * screen.height];
Random r = RTTools.GetRNG();
for (int i = 0; i < rngSeed.Length; i++)
rngSeed[i] = r.Next();
//import buffers etc to GPU
Vector3[] data = new Vector3[screen.width * screen.height];
Vector3[] sphereOrigins = Scene.GetOrigins;
float[] sphereRadii = Scene.GetRadii;
var FlagRW = ComputeMemoryFlags.ReadWrite | ComputeMemoryFlags.UseHostPointer;
var FlagR = ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer;
rngBuffer = new ComputeBuffer<int>(context, FlagRW, rngSeed);
screenPixels = new ComputeBuffer<int>(context, FlagRW, screen.pixels);
skyBox = new ComputeBuffer<float>(context, FlagR, scene.skybox);
originBuffer = new ComputeBuffer<Vector3>(context, FlagR, sphereOrigins);
radiusBuffer = new ComputeBuffer<float>(context, FlagR, sphereRadii);
accBuffer = new ComputeBuffer<Vector3>(context, FlagRW, accumulator);
kernel.SetValueArgument(0, camera.p1);
kernel.SetValueArgument(1, camera.p2);
kernel.SetValueArgument(2, camera.p3);
kernel.SetValueArgument(3, camera.up);
kernel.SetValueArgument(4, camera.right);
kernel.SetValueArgument(5, camera.pos);
kernel.SetValueArgument(6, camera.lensSize);
kernel.SetValueArgument(7, (float)screen.width);
kernel.SetValueArgument(8, (float)screen.height);
kernel.SetMemoryArgument(9, rngBuffer);
kernel.SetMemoryArgument(10, screenPixels);
kernel.SetMemoryArgument(11, skyBox);
kernel.SetMemoryArgument(12, originBuffer);
kernel.SetMemoryArgument(13, radiusBuffer);
kernel.SetMemoryArgument(14, accBuffer);
queue = new ComputeCommandQueue(context, context.Devices[0], 0);
long[] tempWorkSize = { screen.width * screen.height }; //For some reason, doing this directly produces a build error.
workSize = tempWorkSize; //Luckily, this works.
}
//Constructor.
public static void CreateDebug(Scene sce, Surface scr)
{
Rays = new List<Ray>();
scene = sce;
screen = scr;
}
