// sample: samples a single path up to a maximum depth
private Vector3 Sample(Ray ray, int depth, int x, int y)
{
// find nearest ray/scene intersection
Scene.Intersect(ray);
if (ray.objIdx == -1)
{
// no scene primitive encountered; skybox
return(1.0f * scene.SampleSkydome(ray.D));
}
// calculate intersection point
Vector3 I = ray.O + ray.t * ray.D;
// get material at intersection point
Material material = scene.GetMaterial(ray.objIdx, I);
if (material.emissive)
{
// hit light
return(material.diffuse);
}
// terminate if path is too long
if (depth >= MAXDEPTH)
{
return(Vector3.Zero);
}
// handle material interaction
float r0 = RTTools.RandomFloat();
Vector3 R = Vector3.Zero;
if (r0 < material.refr)
{
// dielectric: refract or reflect
RTTools.Refraction(ray.inside, ray.D, ray.N, ref R);
Ray extensionRay = new Ray(I + R * EPSILON, R, 1e34f);
extensionRay.inside = (Vector3.Dot(ray.N, R) < 0);
return(material.diffuse * Sample(extensionRay, depth + 1, x, y));
}
else if ((r0 < (material.refl + material.refr)) && (depth < MAXDEPTH))
{
// pure specular reflection
R = Vector3.Reflect(ray.D, ray.N);
Ray extensionRay = new Ray(I + R * EPSILON, R, 1e34f);
return(material.diffuse * Sample(extensionRay, depth + 1, x, y));
}
else
{
// diffuse reflection
if (x == 500 && y == 400)
{
//Console.WriteLine("test");
//return new Vector3(255,255,255);
}
R = RTTools.DiffuseReflection(RTTools.GetRNG(), ray.N);
Ray extensionRay = new Ray(I + R * EPSILON, R, 1e34f);
return(Vector3.Dot(R, ray.N) * material.diffuse * Sample(extensionRay, depth + 1, x, y));
}
}
// tick: renders one frame
public void Tick()
{
// initialize timer
if (firstFrame)
{
timer.Reset();
timer.Start();
firstFrame = false;
}
// handle keys, only when running time set to -1 (infinite)
if (runningTime == -1) if (camera.HandleInput())
{
// camera moved; restart
ClearAccumulator();
}
// render
if (false) // if (useGPU)
{
// add your CPU + OpenCL path here
// mind the gpuPlatform parameter! This allows us to specify the platform on our
// test system.
// note: it is possible that the automated test tool provides you with a different
// platform number than required by your hardware. In that case, you can hardcode
// the platform during testing (ignoring gpuPlatform); do not forget to put back
// gpuPlatform before submitting!
}
else
{
// this is your CPU only path
float scale = 1.0f / (float)++spp;
for( int y = 0; y < screen.height; y++ )
{
for( int x = 0; x < screen.width; x++ )
{
// generate primary ray
Ray ray = camera.Generate( RTTools.GetRNG(), x, y );
// trace path
int pixelIdx = x + y * screen.width;
accumulator[pixelIdx] += Sample( ray, 0 );
// plot final color
screen.pixels[pixelIdx] = RTTools.Vector3ToIntegerRGB( scale * accumulator[pixelIdx] );
}
}
}
// stop and report when max render time elapsed
int elapsedSeconds = (int)(timer.ElapsedMilliseconds / 1000);
if (runningTime != -1) if (elapsedSeconds >= runningTime)
{
OpenTKApp.Report( (int)timer.ElapsedMilliseconds, spp, screen );
}
}
static public void Refraction(bool inside, Vector3 D, Vector3 N, ref Vector3 R)
{
float nc = inside ? 1 : 1.2f, nt = inside ? 1.2f : 1;
float nnt = nt / nc, ddn = Vector3.Dot(D, N);
float cos2t = 1.0f - nnt * nnt * (1 - ddn * ddn);
R = Vector3.Reflect(D, N);
if (cos2t >= 0)
{
float r1 = RTTools.RandomFloat();
float a = nt - nc, b = nt + nc, R0 = a * a / (b * b), c = 1 + ddn;
float Tr = 1 - (R0 + (1 - R0) * c * c * c * c * c);
if (r1 < Tr)
{
R = (D * nnt - N * (ddn * nnt + (float)Math.Sqrt(cos2t)));
}
}
}
// 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;
}
}
// tick: renders one frame
public void Tick()
{
// initialize timer
if (firstFrame)
{
timer.Reset();
timer.Start();
firstFrame = false;
}
// handle keys, only when running time set to -1 (infinite)
if (runningTime == -1)
{
if (camera.HandleInput())
{
// camera moved; restart
ClearAccumulator();
}
}
// render
if (false) // if (useGPU)
{
// add your CPU + OpenCL path here
// mind the gpuPlatform parameter! This allows us to specify the platform on our
// test system.
// note: it is possible that the automated test tool provides you with a different
// platform number than required by your hardware. In that case, you can hardcode
// the platform during testing (ignoring gpuPlatform); do not forget to put back
// gpuPlatform before submitting!
long[] workSize = { screen.width, screen.height };
long[] localSize = { 16, 2 };
queue.Execute(kernel, null, workSize, null, null);
queue.Finish();
queue.ReadFromBuffer(outputBuffer, ref screen.pixels, true, null);
Console.WriteLine(screen.pixels[0]);
Random r = RTTools.GetRNG();
for (int i = 0; i < 1000; i++)
{
randoms[i] = (float)r.NextDouble();
}
rndBuffer = new ComputeBuffer <float>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, randoms);
cameraBuffer = new ComputeBuffer <Vector3>(context, ComputeMemoryFlags.ReadOnly | ComputeMemoryFlags.UseHostPointer, camera.toCL());
kernel.SetMemoryArgument(6, cameraBuffer);
kernel.SetMemoryArgument(7, rndBuffer);
}
else
{
// this is your CPU only path
float scale = 1.0f / (float)++spp;
Parallel.For(0, screen.height, y => {
for (int x = 0; x < screen.width; x++)
{
// generate primary ray
Ray ray = camera.Generate(RTTools.GetRNG(), x, y);
// trace path
int pixelIdx = x + y * screen.width;
accumulator[pixelIdx] += Sample(ray, 0, x, y);
// plot final color
screen.pixels[pixelIdx] = RTTools.Vector3ToIntegerRGB(scale * accumulator[pixelIdx]);
}
});
}
// stop and report when max render time elapsed
int elapsedSeconds = (int)(timer.ElapsedMilliseconds / 1000);
if (runningTime != -1)
{
if (elapsedSeconds >= runningTime)
{
OpenTKApp.Report((int)timer.ElapsedMilliseconds, spp, screen);
}
}
}
// tick: renders one frame
public void Tick()
{
//float t = 21.5f;
// initialize timer
if (firstFrame)
{
timer.Reset();
timer.Start();
firstFrame = false;
}
// handle keys, only when running time set to -1 (infinite)
if (runningTime == -1)
if (camera.HandleInput())
{
// camera moved; restart
ClearAccumulator();
}
// render
if (useGPU)
{
// add your CPU + OpenCL path here
// mind the gpuPlatform parameter! This allows us to specify the platform on our
// test system.
// note: it is possible that the automated test tool provides you with a different
// platform number than required by your hardware. In that case, you can hardcode
// the platform during testing (ignoring gpuPlatform); do not forget to put back
// gpuPlatform before submitting!
GL.Finish();
// clear the screen
screen.Clear(0);
// do opencl stuff
if (GLInterop)
{
kernel.SetMemoryArgument(0, texBuffer);
}
else
{
kernel.SetMemoryArgument(0, buffer);
}
// execute kernel
//long[] workSize = { screen.width, screen.height };
long[] localSize = { 8, 12 };
long [] workSize = { screen.width , screen.height };
if (GLInterop)
{
List<ComputeMemory> c = new List<ComputeMemory>() { texBuffer };
queue.AcquireGLObjects(c, null);
queue.Execute(kernel, null, workSize, localSize, null);
queue.Finish();
queue.ReleaseGLObjects(c, null);
}
else
{
camera.Update();
gpuCamera = new GPUCamera(camera.pos, camera.p1, camera.p2, camera.p3, camera.up, camera.right, screen.width, screen.height, camera.lensSize);
float scale = 1.0f / (float)++spp;
kernel.SetValueArgument(2, gpuCamera);
kernel.SetValueArgument(3, scale);
queue.Execute(kernel, null, workSize, localSize, null);
queue.Finish();
// fetch results
if (!GLInterop)
{
queue.ReadFromBuffer(buffer, ref data, true, null);
// visualize result
for (int y = 0; y < screen.height; y++)
for (int x = 0; x < screen.width; x++)
{
int temp = x + y * screen.width;
screen.pixels[temp] = data[temp];
}
}
}
}
else
{
// this is your CPU only path
float scale = 1.0f / (float)++spp;
Parallel.For(0, dataArray.Length, parallelOptions, (id) =>
{
for (int j = dataArray[id].y1; j < dataArray[id].y2 && j < screen.height; j++)
{
for (int i = dataArray[id].x1; i < dataArray[id].x2 && i < screen.width; i++)
{
// generate primary ray
Ray ray = camera.Generate(RTTools.GetRNG(), i, j);
// trace path
int pixelIdx = i + j * screen.width;
accumulator[pixelIdx] += Sample(ray, 0);
// plot final color
screen.pixels[pixelIdx] = RTTools.Vector3ToIntegerRGB(scale * accumulator[pixelIdx]);
}
}
});
}
// stop and report when max render time elapsed
int elapsedSeconds = (int)(timer.ElapsedMilliseconds / 1000);
if (runningTime != -1) if (elapsedSeconds >= runningTime)
{
OpenTKApp.Report((int)timer.ElapsedMilliseconds, spp, screen);
}
}
