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YazenGhannam_CAP6721_RayTracer.html
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<!--
Author: Yazen Ghannam
Spring 2013
CAP 6721
Assignment 1
-->
<!DOCTYPE html>
<html>
<head>
<meta content="text/html;charset=utf-8" http-equiv="Content-Type">
<meta content="utf-8" http-equiv="encoding">
<script id="openclProgram" type="text/x-opencl">
typedef struct {
float3 d, o;
}Ray;
typedef struct{
float3 c;
float r;
}Sphere;
typedef struct{
float t;
int shapeIndex;
float3 P;
float3 N;
}Intersection;
float rayPlane(
Ray ray,
float3 normal,
float3 point){
float t = INFINITY;
float rayNormal = dot(ray.d, normal);
if( rayNormal != 0){
t = dot(point-ray.o, normal)/rayNormal;
}
return (t>0) ? t : INFINITY;
}
float3 rayTriangle(
Ray ray,
float3 p0,
float3 p1,
float3 p2){
float t = INFINITY;
/*
float3 normal = cross(p1-p0, p2-p0);
t = rayPlane(rayOrigin, rayDirection, normal, p0);
if(t > 0){
float3 p = rayOrigin + t*rayDirection;
float normalSquared = dot(normal, normal);
float alpha = dot(normal, cross(p-p0, p2-p0))/normalSquared;
float beta = dot(normal, cross(p1-p0, p-p0))/normalSquared;
if(alpha < 0 || beta < 0 || alpha+beta > 1){
t = 0;
}
}
*/
float3 e1 = p1-p0;
float3 e2 = p2-p0;
float3 s = ray.o-p0;
float invDet = 1.0f / dot(cross(ray.d, e2), e1);
t = invDet * dot(cross(s, e1), e2);
float alpha = invDet * dot(cross(ray.d, e2), s);
float beta = invDet * dot(cross(s, e1), ray.d);
if(t < 0 || alpha < 0 || beta < 0 || alpha+beta > 1){
t = INFINITY;
}
return (float3)(t, alpha, beta);
}
float raySphere(
Ray ray,
Sphere sphere){
float t = INFINITY;
float a = dot(ray.d, ray.d);
float b = 2.0f * dot(ray.o - sphere.c ,ray.d);
float c = dot(ray.o-sphere.c,ray.o-sphere.c) - sphere.r*sphere.r;
float discriminant = b*b - 4.0f*a*c;
if (discriminant == 0){
t = -b/(2.0f*a);
}
else{
float root = sqrt(discriminant);
float q = (b < 0) ? (-0.5f*(b-root)) : (-0.5f*(b+root));
float x1 = q/a;
float x2 = c/q;
if(x1 > 0 && x2 > 0){
t = (x1 < x2) ? x1:x2;
}
else if (x1 > 0 && x2 <= 0){
t = x1;
}
else if (x1 <= 0 && x2 > 0){
t = x2;
}
else{
t = INFINITY;
}
}
return t;
}
float3 reflect(float3 normal, float3 incident){
return normalize( 2 * normal * clamp(dot(normalize(incident), normal), 0.0f, 1.f) - incident);
}
float boundingBoxIntersect(Ray ray, float3 boundMin, float3 boundMax){
float temp = 1.f / ray.d.x;
float txmin = (boundMin.x - ray.o.x) * temp;
float txmax = (boundMax.x - ray.o.x) * temp;
if( txmin > txmax){
temp = txmin;
txmin = txmax;
txmax = temp;
}
temp = 1.f / ray.d.y;
float tymin = (boundMin.y - ray.o.y) * temp;
float tymax = (boundMax.y - ray.o.y) * temp;
if( tymin > tymax){
temp = tymin;
tymin = tymax;
tymax = temp;
}
temp = 1.f / ray.d.z;
float tzmin = (boundMin.z - ray.o.z) * temp;
float tzmax = (boundMax.z - ray.o.z) * temp;
if( tzmin > tzmax){
temp = tzmin;
tzmin = tzmax;
tzmax = temp;
}
float tmin = max(txmin, max(tymin, tzmin));
float tmax = min(txmax, max(tymax, tzmax));
return (tmin < tmax) ? tmin : -1;
}
float3 transformRayDirection(float3 localDirection, float3 U, float3 V, float3 W){
float3 world;
world.x = U.x*localDirection.x + V.x*localDirection.y + W.x*localDirection.z;
world.y = U.y*localDirection.x + V.y*localDirection.y + W.y*localDirection.z;
world.z = U.z*localDirection.x + V.z*localDirection.y + W.z*localDirection.z;
return world;
}
Intersection intersect(
Ray ray,
bool isShadowRay,
int shapeType,
int numShapes,
__global float4 *shapeData,
__global float4 *shapeNormals,
__global uint4 *shapeIndices){
Intersection intersection;
intersection.t = INFINITY;
intersection.shapeIndex = -1;
unsigned int i = 0;
if(shapeType == 1){
for( i = 0; i < numShapes; i++){
Sphere sphere;
sphere.c = shapeData[i].xyz;
sphere.r = shapeData[i].w;
float rv = raySphere(ray, sphere);
if ( rv < intersection.t ){
intersection.t = rv;
intersection.shapeIndex = i;
if(isShadowRay){
break;
}
}
}
intersection.P = ray.o + intersection.t*ray.d;
intersection.N = normalize(intersection.P - shapeData[intersection.shapeIndex].xyz);
}
else if(shapeType == 2){
float alpha, beta;
for( i = 0; i < numShapes; i++){
float3 p0 = shapeData[shapeIndices[i].x].xyz;
float3 p1 = shapeData[shapeIndices[i].y].xyz;
float3 p2 = shapeData[shapeIndices[i].z].xyz;
float3 rv = rayTriangle(ray, p0, p1, p2);
if ( rv.x < intersection.t ){
intersection.t = rv.x;
alpha = rv.y;
beta = rv.z;
intersection.shapeIndex = i;
if(isShadowRay){
break;
}
}
}
intersection.P = ray.o + intersection.t*ray.d;
float3 n0 = shapeNormals[shapeIndices[intersection.shapeIndex].x].xyz;
float3 n1 = shapeNormals[shapeIndices[intersection.shapeIndex].y].xyz;
float3 n2 = shapeNormals[shapeIndices[intersection.shapeIndex].z].xyz;
intersection.N = normalize( (1-alpha-beta)*n0 + alpha*n1 + beta*n2);
}
return intersection;
}
Intersection intersectGrid(
Ray ray,
bool isShadowRay,
int shapeType,
int voxelIndex,
__global int *gridMetadata,
__global int *gridVoxels,
__global float4 *shapeData,
__global float4 *shapeNormals,
__global uint4 *shapeIndices){
Intersection intersection;
intersection.t = INFINITY;
intersection.shapeIndex = -1;
int numShapes = gridMetadata[voxelIndex*2];
int offset = gridMetadata[voxelIndex*2 + 1];
if(numShapes > 0){
unsigned int i = 0;
if(shapeType == 1){
for( i = 0; i < numShapes; i++){
Sphere sphere;
sphere.c = shapeData[gridVoxels[offset+i]].xyz;
sphere.r = shapeData[gridVoxels[offset+i]].w;
float rv = raySphere(ray, sphere);
if ( rv < intersection.t ){
intersection.t = rv;
intersection.shapeIndex = gridVoxels[offset+i];
if(isShadowRay){
break;
}
}
}
intersection.P = ray.o + intersection.t*ray.d;
intersection.N = normalize(intersection.P - shapeData[intersection.shapeIndex].xyz);
}
else if(shapeType == 2){
float alpha, beta;
for( i = 0; i < numShapes; i++){
float3 p0 = shapeData[shapeIndices[gridVoxels[offset+i]].x].xyz;
float3 p1 = shapeData[shapeIndices[gridVoxels[offset+i]].y].xyz;
float3 p2 = shapeData[shapeIndices[gridVoxels[offset+i]].z].xyz;
float3 rv = rayTriangle(ray, p0, p1, p2);
if ( rv.x < intersection.t ){
intersection.t = rv.x;
alpha = rv.y;
beta = rv.z;
intersection.shapeIndex = gridVoxels[offset+i];
if(isShadowRay){
break;
}
}
}
intersection.P = ray.o + intersection.t*ray.d;
float3 n0 = shapeNormals[shapeIndices[intersection.shapeIndex].x].xyz;
float3 n1 = shapeNormals[shapeIndices[intersection.shapeIndex].y].xyz;
float3 n2 = shapeNormals[shapeIndices[intersection.shapeIndex].z].xyz;
intersection.N = normalize( (1-alpha-beta)*n0 + alpha*n1 + beta*n2);
}
}
return intersection;
}
int3 gridIndex(float3 point, float3 boundMin, float3 boundSize, int3 gridRes){
return (int3)( (int)clamp( round((point.x-boundMin.x)/boundSize.x), 0.f, (float)(gridRes.x-1)),
(int)clamp( round((point.y-boundMin.y)/boundSize.y), 0.f, (float)(gridRes.y-1)),
(int)clamp( round((point.z-boundMin.z)/boundSize.z), 0.f, (float)(gridRes.z-1)));
}
__kernel void getPixelColor(
const int shapeType,
const int numShapes,
__global float4 *viewData,
__global float4 *shapeData,
__global float4 *shapeNormals,
__global uint4 *shapeIndices,
__global int *gridMetadata,
__global int *gridVoxels,
__global uchar4 *raster,
__global float4 *debug){
const int col = get_global_id(0);
const int row = get_global_id(1);
const int columns = (int) viewData[0].x;
const int rows = (int) viewData[0].y;
const float width = viewData[0].z;
const float height = viewData[0].w;
float3 boundMin = viewData[1].xyz;
float3 boundMax = viewData[2].xyz;
int3 gridRes = (int3)((int)viewData[3].x, (int)viewData[3].y, (int)viewData[3].z);
float4 flags = viewData[4];
float3 eye = viewData[5].xyz;
float3 U = viewData[6].xyz;
float3 V = viewData[7].xyz;
float3 W = viewData[8].xyz;
int numIter = 0;
int3 gridI = (int3)(0,0,0);
//float enableDiffuse = viewData[7].x;
//float enableSpecular = viewData[7].x;
//float enableShadows = viewData[7].x;
//float enableInterreflection = viewData[7].x;
bool accelerated = (flags.x == 1.0f);
float3 localDirection;
localDirection.x = width * ( (col+0.5f)/columns - 0.5f);
localDirection.y = height * (0.5f - (row+0.5f)/rows);
localDirection.z = -1.f;
Ray worldRay;
worldRay.o = eye;
worldRay.d = transformRayDirection(localDirection, U, V, W);
for(int i = 0; i < 4; i++)
debug[i] = (float4)(0,0,0,0);
debug[0] = flags;
uchar4 color = (uchar4)(0, 0, 0, 255);
float tmin = boundingBoxIntersect(worldRay, boundMin, boundMax);
if( tmin > 0){
Intersection intersection;
float3 L = (float3)(1.f,1.f,0.f);
float4 lightIntensity = (float4)(1.f, 1.f, 1.f, 1.f);
float4 kd = (float4)(0.6f, 0.6f, 0.6f, 1.f);
float4 ks = (float4)(0.4f,0.4f,0.4f,1.f);
float4 ka = (float4)(0.1f, 0.1f, 0.1f, 1.f);
float shininess = 10;
float epsilon = pow(10.f, -2.f);
if(accelerated){
float3 boundSize = boundMax-boundMin;
int di = (worldRay.d.x >= 0) ? 1 : -1;
int xOutOfRange = (worldRay.d.x >= 0) ? gridRes.x : -1;
float dTx = (boundSize.x) / fabs(worldRay.d.x);
int dj = (worldRay.d.y >= 0) ? 1 : -1;
int yOutOfRange = (worldRay.d.y >= 0) ? gridRes.y : -1;
float dTy = (boundSize.y) / fabs(worldRay.d.y);
int dk = (worldRay.d.z >= 0) ? 1 : -1;
int zOutOfRange = (worldRay.d.z >= 0) ? gridRes.z : -1;
float dTz = (boundSize.z) / fabs(worldRay.d.z);
bool intersected = false;
float tCurrent = tmin;//max(0.f, tmin);
float3 gridPoint = worldRay.o + tCurrent * worldRay.d;
int3 gridCoord = gridIndex(gridPoint, boundMin, boundSize, gridRes);
float dX = (boundSize.x) / gridRes.x;
float txNext = (di == 1) ?
tCurrent+((boundMin.x + (gridCoord.x+di) * dX - gridPoint.x) / worldRay.d.x) :
tCurrent+((boundMin.x + (gridCoord.x) * dX - gridPoint.x) / worldRay.d.x);
float dY = (boundSize.y) / gridRes.y;
float tyNext = (dj == 1) ?
tCurrent+((boundMin.y + (gridCoord.y+dj) * dY - gridPoint.y) / worldRay.d.y) :
tCurrent+((boundMin.y + (gridCoord.y) * dY - gridPoint.y) / worldRay.d.y);
float dZ = (boundSize.z) / gridRes.z;
float tzNext = (dk == 1) ?
tCurrent+((boundMin.z + (gridCoord.z+dk) * dZ - gridPoint.z) / worldRay.d.z) :
tCurrent+((boundMin.z + (gridCoord.z) * dZ - gridPoint.z) / worldRay.d.z);
const int cmpToAxis[8] = { 2, 1, 2, 1, 2, 2, 0, 0};
while(!intersected){
if( gridCoord.x == xOutOfRange || gridCoord.y == yOutOfRange || gridCoord.z == zOutOfRange)
break;
numIter++;
int voxelIndex = gridCoord.z + ( gridCoord.y + gridCoord.x*gridRes.y) * gridRes.z;
intersection
= intersectGrid(worldRay, false, shapeType, voxelIndex, gridMetadata, gridVoxels, shapeData, shapeNormals, shapeIndices);
intersected = (intersection.t < INFINITY);
if(!intersected){
int bits = ((txNext < tyNext) << 2) +
((txNext < tzNext) << 1) +
((tyNext < tzNext));
int stepAxis = cmpToAxis[bits];
if(stepAxis == 0){
gridCoord.x += di;
txNext += dTx;
}
else if(stepAxis == 1){
gridCoord.y += dj;
tyNext += dTy;
}
else{
gridCoord.z += dk;
tzNext += dTz;
}
}
}
gridI = gridCoord;
}
else{
intersection
= intersect(worldRay, false, shapeType, numShapes, shapeData, shapeNormals, shapeIndices);
}
if (intersection.t < INFINITY){
/*
Ray shadowRay;
shadowRay.o = intersection.P + epsilon;
shadowRay.d = L;
Intersection shadowIntersection
= intersect(shadowRay, true, shapeType, numShapes, shapeData, shapeNormals, shapeIndices);
Ray reflectedRay;
reflectedRay.o = intersection.P + epsilon;
reflectedRay.d = reflect(intersection.N, -intersection.P);
Intersection reflectedIntersection
= intersect(reflectedRay, false, shapeType, numShapes, shapeData, shapeNormals, shapeIndices);
float4 diffuse
= (shadowIntersection.t < INFINITY) ?
(float4)(0,0,0,0) : (kd * clamp(dot(intersection.N, normalize(L)), 0.0f, 1.f));
if(reflectedIntersection.t < INFINITY){
Ray reflectedShadowRay;
reflectedShadowRay.o = reflectedIntersection.P + epsilon;
reflectedShadowRay.d = L;
Intersection reflectedShadowIntersection
= intersect(reflectedShadowRay, true, shapeType, numShapes, shapeData, shapeNormals, shapeIndices);
if(reflectedShadowIntersection.t < INFINITY){
float4 reflectedDiffuse = kd * clamp(dot(reflectedIntersection.N, normalize(L)), 0.0f, 1.f);
diffuse = (1.f - ks) * diffuse + ks * reflectedDiffuse;
}
}
*/
float4 diffuse = (kd * clamp(dot(intersection.N, normalize(L)), 0.0f, 1.f));
//float3 View = normalize( -worldRay.d);
//float3 R = reflect(intersection.N, L);
float4 specular = 0;//ks * pow(clamp(dot(View, R), 0.0f, 1.f), shininess);
//TODO: Ambient Lighting
float4 ambient = 0;//ka * lightIntensity;
float4 Intensity = lightIntensity * (diffuse + specular + ambient);
uchar red = (uchar) round(255*Intensity.x);
uchar green = (uchar) round(255*Intensity.y);
uchar blue = (uchar) round(255*Intensity.z);
color = (uchar4)(red, green, blue, 255);
}
}
gridI *= 255/4;
raster[row * columns + col] = (uchar4)(numIter*255/4 , color.y, color.z, 255);//((uchar)gridI.x, (uchar)gridI.y, (uchar)gridI.z, 255);
}
</script>
<script type="text/javascript">
var model = null;
var platforms = null;
var devices = [];
var canvas = null;
var canvasCtx = null;
var raster = null;
var rv = null;
var device = null;
var clCtx = null;
var clCQ = null;
var clProgram = null;
var clKernels = new Object();
var clBuffers = new Object();
var shapeType = 0;
var numShapes = 0;
var boundingVolume;
var viewDimensions = null;
var flags = [0, 0, 0, 0];
var camera = new Object();
var rotate = false;
var sceneLoaded = false;
var acceleration = 1.0;
var localWS = null;
var globalWS = null;
function parseJSON(jsonFile){
var xhttp = new XMLHttpRequest();
xhttp.open("GET", jsonFile, false);
xhttp.overrideMimeType("application/json");
xhttp.send(null);
//console.log(jsonFile);
//console.log(xhttp);
return JSON.parse(xhttp.responseText);
}
function loadFile(){
model = parseJSON(document.getElementById("inputFile").value);
//console.log(model);
loadScene();
}
function padArray(array, currentSize){
var paddedArray = new Array();
var j = 0;
for(var i = 0; i < array.length; i++, j++){
if(i > 0 && i % currentSize == 0){
paddedArray[j++] = 0;
//paddedArray[++j] = array[i];
}
paddedArray[j] = array[i];
}
paddedArray[j] = 0;
return paddedArray;
}
function vecLength(array){
var total = 0;
for(x in array){
total += array[x]*array[x];
}
return Math.sqrt(total);
}
function normalize(array){
var length = vecLength(array);
for(x in array){
array[x] /= length;
}
return array;
}
function cross(a, b){
if(a.length != b.length || a.length != 3)
throw "cross: vectors must be length 3.";
var c = new Array();
c[0] = a[1]*b[2] - a[2]*b[1];
c[1] = -(a[0]*b[2] - a[2]*b[0]);
c[2] = a[0]*b[1] - a[1]*b[0];
return c;
}
function addVec(a, b){
if(a.length != b.length)
throw "subtractVec: vectors must be same length.";
var c = new Array();
for (x in a){
c[x] = a[x]+b[x];
}
return c;
}
function subtractVec(a, b){
if(a.length != b.length)
throw "subtractVec: vectors must be same length.";
var c = new Array();
for (x in a){
c[x] = a[x]-b[x];
}
return c;
}
function divideVec(a, num){
for (x in a){
a[x] /= num;
}
return a;
}
function updateRotate(){
rotate = !rotate;
}
function updateAcceleration(){
acceleration = document.getElementById("acceleration").checked ? 1.0 : 0.0;
flags = [acceleration, 0, 0, 0];
}
function updateCamera(){
camera.phi += Math.PI/90;
//camera.theta += Math.PI/360;
camera.eye[0] = camera.radius * Math.sin(camera.theta) * Math.cos(camera.phi);
camera.eye[1] = camera.radius * Math.cos(camera.theta);
camera.eye[2] = camera.radius * Math.sin(camera.theta) * Math.sin(camera.phi);//[boundingVolume.center[0], boundingVolume.center[1], boundingVolume.center[2]+boundingVolume.diagonal];
var W = normalize( subtractVec(camera.eye, camera.at));
var U = normalize( cross(camera.up, W));
var V = cross( W, U);
var cameraData = padArray(camera.eye.concat(U, V, W), 3);
var viewData = viewDimensions.concat(flags, cameraData);
//console.log(cameraData);
var startTime = new Date().getTime();
clCQ.enqueueWriteBuffer(clBuffers.viewDataBuffer, true, 0, 4*viewData.length, new Float32Array(viewData), []);
clCQ.enqueueNDRangeKernel(clKernels.colorKernel, globalWS.length, [], globalWS, localWS, []);
clCQ.finish();
var endTime = new Date().getTime();
console.log("Compute time: "+(endTime-startTime));
clCQ.enqueueReadBuffer(clBuffers.rasterBuffer, true, 0, canvas.width*canvas.height*4, raster.data, []);
canvasCtx.putImageData(raster, 0, 0);
}
function createBoundingVolume(){
boundingVolume = new Object();
var xmin = Number.MAX_VALUE;
var ymin = Number.MAX_VALUE;
var zmin = Number.MAX_VALUE;
var xmax = Number.MIN_VALUE;
var ymax = Number.MIN_VALUE;
var zmax = Number.MIN_VALUE;
if(shapeType == 1){
var centers = model.spheres[0].centers;
var radii = model.spheres[0].radii;
for ( var i = 0; i < centers.length; i+=3){
xmin = Math.min(xmin, centers[i]-radii[i/3]);
ymin = Math.min(ymin, centers[i+1]-radii[i/3]);
zmin = Math.min(zmin, centers[i+2]-radii[i/3]);
xmax = Math.max(xmax, centers[i]+radii[i/3]);
ymax = Math.max(ymax, centers[i+1]+radii[i/3]);
zmax = Math.max(zmax, centers[i+2]+radii[i/3]);
}
boundingVolume.min = [xmin, ymin, zmin];
boundingVolume.max = [xmax, ymax, zmax];
boundingVolume.center = divideVec(addVec(boundingVolume.max, boundingVolume.min), 2);
boundingVolume.diagonal = vecLength(subtractVec(boundingVolume.max, boundingVolume.min));
}
else if(shapeType == 2){
var vertices = model.meshes[0].vertexPositions;
for( var i = 0; i < vertices.length; i+=3){
xmin = Math.min(xmin, vertices[i]);
ymin = Math.min(ymin, vertices[i+1]);
zmin = Math.min(zmin, vertices[i+2]);
xmax = Math.max(xmax, vertices[i]);
ymax = Math.max(ymax, vertices[i+1]);
zmax = Math.max(zmax, vertices[i+2]);
}
boundingVolume.min = [xmin, ymin, zmin];
boundingVolume.max = [xmax, ymax, zmax];
boundingVolume.center = divideVec(addVec(boundingVolume.max, boundingVolume.min), 2);
boundingVolume.diagonal = vecLength(subtractVec(boundingVolume.max, boundingVolume.min));
}
boundingVolume.xSize = boundingVolume.max[0]-boundingVolume.min[0];
boundingVolume.ySize = boundingVolume.max[1]-boundingVolume.min[1];
boundingVolume.zSize = boundingVolume.max[2]-boundingVolume.min[2];
}
function offset(x, y, z){
return z + (y + x*boundingVolume.grid.yResolution)*boundingVolume.grid.zResolution;
}
function createGrid(){
boundingVolume.grid = new Object();
var maxResolution = 64;
var a = 3 * Math.max(boundingVolume.xSize, boundingVolume.ySize, boundingVolume.zSize) / Math.pow(numShapes, 1.0/3.0);
boundingVolume.grid.xResolution = Math.round(boundingVolume.xSize/a);
boundingVolume.grid.xResolution = (boundingVolume.grid.xResolution < 1) ? 1 :
( (boundingVolume.grid.xResolution > maxResolution) ? 64 : boundingVolume.grid.xResolution);
//boundingVolume.grid.xResolution = 1;
boundingVolume.grid.yResolution = Math.round(boundingVolume.ySize/a);
boundingVolume.grid.yResolution = (boundingVolume.grid.yResolution < 1) ? 1 :
( (boundingVolume.grid.yResolution > maxResolution) ? 64 : boundingVolume.grid.yResolution);
//boundingVolume.grid.yResolution = 1;
boundingVolume.grid.zResolution = Math.round(boundingVolume.zSize/a);
boundingVolume.grid.zResolution = (boundingVolume.grid.zResolution < 1) ? 1 :
( (boundingVolume.grid.zResolution > maxResolution) ? 64 : boundingVolume.grid.zResolution);
//boundingVolume.grid.zResolution = 1;
console.log("Resolutions: ",boundingVolume.grid.xResolution, boundingVolume.grid.yResolution, boundingVolume.grid.zResolution);
boundingVolume.grid.metadata = new Array();
boundingVolume.grid.voxels = new Array();
boundingVolume.grid.numVoxels = boundingVolume.grid.xResolution * boundingVolume.grid.yResolution * boundingVolume.grid.zResolution;
for (var i = 0; i < boundingVolume.grid.numVoxels; i++){
boundingVolume.grid.metadata[i] = [0,0];
boundingVolume.grid.voxels[i] = new Array();
}
if(shapeType == 1){
var centers = model.spheres[0].centers;
var radii = model.spheres[0].radii;
for ( var i = 0; i < centers.length; i+=3){
var xmin = centers[i]-radii[i/3];
var ymin = centers[i+1]-radii[i/3];
var zmin = centers[i+2]-radii[i/3];
var xmax = centers[i]+radii[i/3];
var ymax = centers[i+1]+radii[i/3];
var zmax = centers[i+2]+radii[i/3];
var gridMin = gridIndex([xmin, ymin, zmin]);
var gridMax = gridIndex([xmax, ymax, zmax]);
for(var x = gridMin[0]; x <= gridMax[0]; x++)
for(var y = gridMin[1]; y <= gridMax[1]; y++)
for(var z = gridMin[2]; z <= gridMax[2]; z++)
boundingVolume.grid.voxels[offset(x, y, z)].push(i/3);
}
}
else if(shapeType == 2){
var vertices = model.meshes[0].vertexPositions;
var indices = model.meshes[0].indices;
for( var i = 0; i < indices.length; i+=3){
var one = indices[i]*3;
var two = indices[i+1]*3;
var three = indices[i+2]*3;
var xmin = Math.min(vertices[one], vertices[two], vertices[three]);
var ymin = Math.min(vertices[one+1], vertices[two+1], vertices[three+1]);
var zmin = Math.min(vertices[one+2], vertices[two+2], vertices[three+2]);
var xmax = Math.max(vertices[one], vertices[two], vertices[three]);
var ymax = Math.max(vertices[one+1], vertices[two+1], vertices[three+1]);
var zmax = Math.max(vertices[one+2], vertices[two+2], vertices[three+2]);
var gridMin = gridIndex([xmin, ymin, zmin]);
var gridMax = gridIndex([xmax, ymax, zmax]);
for(var x = gridMin[0]; x <= gridMax[0]; x++)
for(var y = gridMin[1]; y <= gridMax[1]; y++)
for(var z = gridMin[2]; z <= gridMax[2]; z++)
boundingVolume.grid.voxels[offset(x, y, z)].push(i/3);
}
}
boundingVolume.grid.metadataFlat = []
boundingVolume.grid.voxelsFlat = [];
var voxelOffset = 0;
for (var i = 0; i < boundingVolume.grid.numVoxels; i++){
var voxelLength = (boundingVolume.grid.voxels[i].length) ? boundingVolume.grid.voxels[i].length : 0;
boundingVolume.grid.metadata[i] = [voxelLength, voxelOffset];
voxelOffset += voxelLength;
boundingVolume.grid.metadataFlat = boundingVolume.grid.metadataFlat.concat(boundingVolume.grid.metadata[i]);
boundingVolume.grid.voxelsFlat = boundingVolume.grid.voxelsFlat.concat(boundingVolume.grid.voxels[i]);
}
//console.log(boundingVolume);
}
function gridIndex(point){
var x = Math.round((point[0]-boundingVolume.min[0])/boundingVolume.xSize);
x = (x < 0) ? 0 : ( (x > boundingVolume.grid.xResolution - 1) ? boundingVolume.grid.xResolution-1 : x);
var y = Math.round((point[1]-boundingVolume.min[1])/boundingVolume.ySize);
y = (y < 0) ? 0 : ( (y > boundingVolume.grid.yResolution - 1) ? boundingVolume.grid.yResolution-1 : y);
var z = Math.round((point[2]-boundingVolume.min[2])/boundingVolume.zSize);
z = (z < 0) ? 0 : ( (z > boundingVolume.grid.zResolution - 1) ? boundingVolume.grid.zResolution-1 : z);
return [x, y, z];
}
function loadScene(){
var shapeData = new Array();
var shapeNormals = new Array();
var shapeIndices = new Array();
if(model.spheres){
shapeType = 1;
var j = 0, k = 0;
for(var i = 0; i < model.spheres[0].centers.length; i++, k++){
if(i > 0 && i % 3 == 0){
shapeData[k++] = model.spheres[0].radii[j++];
}
shapeData[k] = model.spheres[0].centers[i];
}
shapeData[k] = model.spheres[0].radii[j];
shapeNormals[0] = 0;
shapeIndices[0] = 0;
numShapes = shapeData.length/4;
}
else if(model.meshes){
shapeType = 2;
shapeData = padArray(model.meshes[0].vertexPositions, 3);
shapeNormals = padArray(model.meshes[0].vertexNormals, 3);
shapeIndices = padArray(model.meshes[0].indices, 3);
numShapes = shapeIndices.length/4;
}
else{
throw "Model error: No shape data";
}
//console.log(shapeIndices);
//var sphereCenters = padArray(model.spheres[0].centers, 3);
clBuffers.shapeDataBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*shapeData.length);
clBuffers.shapeNormalsBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*shapeNormals.length);
clBuffers.shapeIndicesBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*shapeIndices.length);
createBoundingVolume();
createGrid();
//console.log(boundingVolume);
var eye = 0;
var at = 0;
var up = 0;
var fov = 0;
if( model.cameras ){
camera.eye = model.cameras[0].eye;
camera.at = model.cameras[0].at;
camera.up = model.cameras[0].up;
camera.fov = model.cameras[0].fov;
}
else{
camera.eye = [boundingVolume.center[0], boundingVolume.center[1], boundingVolume.center[2]+boundingVolume.diagonal];
camera.at = boundingVolume.center;
camera.up = [0, 1, 0];
camera.fov = 45;
}
camera.radius = vecLength(subtractVec(camera.eye, camera.at));
camera.phi = 0;
camera.theta = 90 * Math.PI / 180;
var W = normalize( subtractVec(camera.eye, camera.at));
var U = normalize( cross(camera.up, W));
var V = cross( W, U);
var cameraData = padArray(camera.eye.concat(U, V, W), 3);
var aspectRatio = canvas.width/canvas.height;
var height = 2 * Math.tan(camera.fov*Math.PI/180/2);
var width = aspectRatio * height;
flags = [acceleration, 0, 0, 0];
viewDimensions = [canvas.width, canvas.height, width, height].concat(
boundingVolume.min, [0],
boundingVolume.max, [0],
[boundingVolume.grid.xResolution, boundingVolume.grid.yResolution, boundingVolume.grid.zResolution], [0]);
var viewData = viewDimensions.concat(flags, cameraData);
console.log(viewDimensions);
clBuffers.viewDataBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*viewData.length);
clBuffers.gridMetadataBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*boundingVolume.grid.metadataFlat.length);
clBuffers.gridVoxelsBuffer = clCtx.createBuffer(WebCL.CL_MEM_READ_ONLY, 4*boundingVolume.grid.voxelsFlat.length);
clBuffers.rasterBuffer = clCtx.createBuffer(WebCL.CL_MEM_WRITE_ONLY, 4*canvas.width*canvas.height);
clBuffers.debugBuffer = clCtx.createBuffer(WebCL.CL_MEM_WRITE_ONLY, 4*shapeData.length);
clKernels.colorKernel = clProgram.createKernel("getPixelColor");
clKernels.colorKernel.setKernelArg(0, shapeType, WebCL.types.INT);
clKernels.colorKernel.setKernelArg(1, numShapes, WebCL.types.INT);
clKernels.colorKernel.setKernelArg(2, clBuffers.viewDataBuffer);
clKernels.colorKernel.setKernelArg(3, clBuffers.shapeDataBuffer);
clKernels.colorKernel.setKernelArg(4, clBuffers.shapeNormalsBuffer);
clKernels.colorKernel.setKernelArg(5, clBuffers.shapeIndicesBuffer);
clKernels.colorKernel.setKernelArg(6, clBuffers.gridMetadataBuffer);
clKernels.colorKernel.setKernelArg(7, clBuffers.gridVoxelsBuffer);
clKernels.colorKernel.setKernelArg(8, clBuffers.rasterBuffer);
clKernels.colorKernel.setKernelArg(9, clBuffers.debugBuffer);
//console.log(device);
wsSize = clKernels.colorKernel.getKernelWorkGroupInfo(device, WebCL.CL_KERNEL_WORK_GROUP_SIZE);
xSize = Math.floor(Math.sqrt(wsSize));
ySize = Math.floor(wsSize/xSize);
localWS = [xSize,ySize];
globalWS = [
Math.ceil (canvas.width / localWS[0]) * localWS[0],
Math.ceil (canvas.height / localWS[1]) * localWS[1]
];
var startTime = new Date().getTime();
clCQ.enqueueWriteBuffer(clBuffers.viewDataBuffer, true, 0, 4*viewData.length, new Float32Array(viewData), []);
clCQ.enqueueWriteBuffer(clBuffers.shapeDataBuffer, true, 0, 4*shapeData.length, new Float32Array(shapeData), []);
clCQ.enqueueWriteBuffer(clBuffers.shapeNormalsBuffer, true, 0, 4*shapeNormals.length, new Float32Array(shapeNormals), []);
clCQ.enqueueWriteBuffer(clBuffers.shapeIndicesBuffer, true, 0, 4*shapeIndices.length, new Uint32Array(shapeIndices), []);
clCQ.enqueueWriteBuffer(clBuffers.gridMetadataBuffer, true, 0, 4*boundingVolume.grid.metadataFlat.length, new Uint32Array(boundingVolume.grid.metadataFlat), []);
clCQ.enqueueWriteBuffer(clBuffers.gridVoxelsBuffer, true, 0, 4*boundingVolume.grid.voxelsFlat.length, new Uint32Array(boundingVolume.grid.voxelsFlat), []);
clCQ.enqueueNDRangeKernel(clKernels.colorKernel, globalWS.length, [], globalWS, localWS, []);
clCQ.finish();
console.log("Compute time: "+(new Date().getTime()-startTime));
clCQ.enqueueReadBuffer(clBuffers.rasterBuffer, true, 0, canvas.width*canvas.height*4, raster.data, []);
canvasCtx.putImageData(raster, 0, 0);
sceneLoaded = true;
//var debug = new Float32Array(16);
//clCQ.enqueueReadBuffer(clBuffers.debugBuffer, true, 0, 4*16, debug, []);
//console.log(debug);
}
function main(){
document.getElementById("inputFile").value = "";
document.getElementById("acceleration").checked = true;
try{
canvas = document.getElementById("myCanvas");
canvasCtx = canvas.getContext("2d");
raster = canvasCtx.createImageData(canvas.width, canvas.height);
platforms = WebCL.getPlatformIDs();
for ( var i in platforms ){
devices[i] = platforms[i].getDeviceIDs(WebCL.CL_DEVICE_TYPE_DEFAULT);
}
//console.log(platforms);
//console.log(devices);
device = devices[0][0];
clCtx = WebCL.createContext([WebCL.CL_CONTEXT_PLATFORM, platforms[0]], devices[0]);
clCQ = clCtx.createCommandQueue(devices[0][0], 0);
clProgram = clCtx.createProgramWithSource(document.getElementById("openclProgram").text);
clProgram.buildProgram(devices[0], "");
var requestAnimationFrame = window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
(function callback(){
requestAnimationFrame(callback);
if(sceneLoaded && rotate)
updateCamera();
})();
//console.log(clBuffers);
}catch(e){
console.log(e);
console.log(clProgram.getProgramBuildInfo(devices[0][0], WebCL.CL_PROGRAM_BUILD_LOG));
return -1;
}
}
function releaseResources(){
for ( x in clBuffers){
clBuffers[x].releaseCLResources();
}
for ( x in clKernels){
clKernels[x].releaseCLResources();
}
clCQ.releaseCLResources();
clProgram.releaseCLResources();
clCtx.releaseCLResources();
}
</script>
</head>
<body onload="main();" onunload="releaseResources();">
<p>Hello, please select a file. The file must be in the current directory.</p>
<input type="file" id="inputFile" size="50" accept="application/json" onchange="loadFile();">
<br>
<div style="float:left">
<canvas id="myCanvas" width="640" height="480"></canvas>
</div>
<div style="float:left">
<p>Camera Controls</p>
<input type="button" onclick="updateRotate();" value="Start/Stop Rotation">
<input type="checkbox" id="acceleration" onchange="updateAcceleration();">Enable Acceleration
</div>
</body>
</html>