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balls_collide.html
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balls_collide.html
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<html>
<head>
<title>Bouncing balls</title>
<meta http-equiv="content-type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript" src="sylvester.js"></script>
<script type="text/javascript" src="glUtils.js"></script>
<script id="per-fragment-lighting-fs" type="x-shader/x-fragment">
#ifdef GL_ES
precision highp float;
#endif
varying vec2 vTextureCoord;
varying vec4 vTransformedNormal;
varying vec4 vPosition;
uniform float uMaterialShininess;
uniform bool uShowSpecularHighlights;
uniform bool uUseLighting;
uniform bool uUseTextures;
uniform vec3 uAmbientColor;
uniform vec3 uPointLightingLocation;
uniform vec3 uPointLightingSpecularColor;
uniform vec3 uPointLightingDiffuseColor;
uniform sampler2D uSampler;
void main(void) {
vec3 lightWeighting;
if (!uUseLighting) {
lightWeighting = vec3(1.0, 1.0, 1.0);
} else {
vec3 lightDirection = normalize(uPointLightingLocation - vPosition.xyz);
vec3 normal = normalize(vTransformedNormal.xyz);
float specularLightWeighting = 0.0;
if (uShowSpecularHighlights) {
vec3 eyeDirection = normalize(-vPosition.xyz);
vec3 reflectionDirection = reflect(-lightDirection, normal);
specularLightWeighting = pow(max(dot(reflectionDirection, eyeDirection), 0.0), uMaterialShininess);
}
float diffuseLightWeighting = max(dot(normal, lightDirection), 0.0);
lightWeighting = uAmbientColor
+ uPointLightingSpecularColor * specularLightWeighting
+ uPointLightingDiffuseColor * diffuseLightWeighting;
}
vec4 fragmentColor;
if (uUseTextures) {
fragmentColor = texture2D(uSampler, vec2(vTextureCoord.s, vTextureCoord.t));
} else {
fragmentColor = vec4(1.0, 1.0, 1.0, 1.0);
}
gl_FragColor = vec4(fragmentColor.rgb * lightWeighting, fragmentColor.a);
}
</script>
<script id="per-fragment-lighting-vs" type="x-shader/x-vertex">
precision highp float;
attribute vec3 aVertexPosition;
attribute vec3 aVertexNormal;
attribute vec2 aTextureCoord;
const float num = 1000.0;
const float prec = 255.0;
uniform float number;
uniform sampler2D uPos;
uniform mat4 uMVMatrix;
uniform mat4 uPMatrix;
uniform mat4 uNMatrix;
varying vec2 vTextureCoord;
varying vec4 vTransformedNormal;
varying vec4 vPosition;
const float sz = 100.0;
vec4 getLoc(float loc) {
vec4 col1 = texture2D(uPos, vec2(loc/num, 0.0/6.0));
vec4 col2 = texture2D(uPos, vec2(loc/num, 1.0/6.0));
vec4 col3 = texture2D(uPos, vec2(loc/num, 2.0/6.0));
float x = col1.r + col1.g/prec + col1.b/(prec*prec);
float y = col2.r + col2.g/prec + col2.b/(prec*prec);
float z = col3.r + col3.g/prec + col3.b/(prec*prec);
x = x > 1.0 ? 1.0 : x;
y = y > 1.0 ? 1.0 : y;
z = z > 1.0 ? 1.0 : z;
// y = 0.5;
// z = 0.5;
return vec4(sz*x-sz/2.0,sz*y-sz/2.0,sz*z-sz/2.0,1.0);
}
vec4 loc(float n) {
return vec4(10.0*sin(3*n), 1.0*cos(3*n), n, 1.0);
}
void main(void) {
mat4 extra;
extra[0] = vec4(1.0,0.0,0.0,0.0);
extra[1] = vec4(0.0,1.0,0.0,0.0);
extra[2] = vec4(0.0,0.0,1.0,0.0);
extra[3] = getLoc(number);
vPosition = extra * uMVMatrix * vec4(aVertexPosition, 1.0);
// vPosition = uMVMatrix * vec4(aVertexPosition, 1.0);
gl_Position = uPMatrix * vPosition;
vTextureCoord = aTextureCoord;
vTransformedNormal = uNMatrix * vec4(aVertexNormal, 1.0);
}
</script>
<script id="phys-vs" type="x-shader/x-vertex">
// precision highp float;
const float num = 1000.0;
attribute vec3 aVertexPosition; // Check from texture
uniform sampler2D uSampler;
uniform int num_items;
uniform float time;
const float prec = 255.0;
varying vec3 vPosition;
varying vec3 vVelocity;
varying float fLinear;
vec3 getLoc(float loc) {
vec4 col1 = texture2D(uSampler, vec2(loc/num, 0.0));
vec4 col2 = texture2D(uSampler, vec2(loc/num, 1.0/6.0));
vec4 col3 = texture2D(uSampler, vec2(loc/num, 2.0/6.0));
float x = col1.r + col1.g/prec + col1.b/(prec*prec);
float y = col2.r + col2.g/prec + col2.b/(prec*prec);
float z = col3.r + col3.g/prec + col3.b/(prec*prec);
return vec3(x,y,z);
}
vec3 getVelo(float loc) {
vec4 col1 = texture2D(uSampler, vec2(loc/num, 3.0/6.0));
vec4 col2 = texture2D(uSampler, vec2(loc/num, 4.0/6.0));
vec4 col3 = texture2D(uSampler, vec2(loc/num, 5.0/6.0));
float x = col1.r + col1.g/prec + col1.b/(prec*prec);
float y = col2.r + col2.g/prec + col2.b/(prec*prec);
float z = col3.r + col3.g/prec + col3.b/(prec*prec);
return vec3(2.0*x-1.0,2.0*y-1.0,2.0*z-1.0);
}
vec3 collide(vec3 pi, vec3 pj, vec3 vi, vec3 vj) {
pi = pi + vi;
pj = pj + vj;
vec3 dist = pi - pj;
float d = length(dist);
// Kinetic energy (should be conserved)
vec3 dv = normalize(dist);
// vec3 dv = dist == 0.0 ? vec3(0.0,0.0,0.0) : normalize(dist);
float res = (dot(vi,dv) - dot(vj,dv)) / 2.0;
// res = max(-0.001, min(res,0.001));
// if (d < 0.02 && d > 0.0002) return res * dv;
/* float e1 = dot(vi,vi) + dot(vj,vj);
float e2 = dot(vi-dv*res, vi-dv*res) +
dot(vj+dv*res, vj+dv*res); */
// Calculate kinetic energy
if (d < 0.02 && d > 0.000002) {
// if (abs(e1-e2) > 0.1) return vec3(0.0,0.0,0.0);
// if (res > 0.1) return vec3(0.0,0.0,-0.01);
return res*dv;
}
// if (d < 0.0002) return vec3(0.0,0.0,-0.001);
else return vec3(0.0,0.0,0.0);
/* d = min(0.01, d);
d = floor(d / 0.01);
return (1.0 - d) * res * dv; */
// return (1.0 - d) * vec3(0.0,0.0,-0.001);
}
vec3 gravity(vec3 pi, vec3 pj) {
vec3 dist = pi - pj;
float d = length(dist);
// var dist_n = dist.x(1/d);
float mag = min(0.001, 0.000000005/(d*d));
return (mag/d)*dist;
}
void main(void) {
vec3 ov = getVelo(aVertexPosition.x);
vec3 p = getLoc(aVertexPosition.x);
vPosition = p + ov;
vec3 v = ov;
int i = int(aVertexPosition.x);
// v = v + vec3(0.00001,0.0,0.0);
// Handle collisions
for (int j = 0; j < num_items; j++) {
v = v - collide(p, getLoc(float(j)), ov, getVelo(float(j)));
}
for (int j = i; j < i+1; j++) {
v = v + collide(p, getLoc(float(j)), ov, getVelo(float(j)));
}
for (int j = 0; j < num_items; j++) {
v = v - gravity(p, getLoc(float(j)));
}
for (int j = i; j < i+1; j++) {
v = v - gravity(p, getLoc(float(j)));
}
/*
if (vPosition.x < 0.0) vPosition.x = 1.0;
else if (vPosition.x > 1.0) vPosition.x = 0.0;
if (vPosition.y < -0.01) vPosition.y = 1.0;
else if (vPosition.y > 1.0) vPosition.y = 0.0;
if (vPosition.z < -0.01) vPosition.z = 0.99;
else if (vPosition.z > 1.0) vPosition.z = 0.01;
vVelocity = v;
*/
if (vPosition.x < 0.0 || vPosition.x > 1.0) v.x = -v.x;
if (vPosition.y < 0.0 || vPosition.y > 1.0) v.y = -v.y;
if (vPosition.z < 0.0 || vPosition.z > 1.0) v.z = -v.z;
float upper = 0.1;
if (v.x > upper) v.x = upper;
if (v.x < -upper) v.x = -upper;
if (v.y > upper) v.y = upper;
if (v.y < -upper) v.y = -upper;
if (v.z > upper) v.z = upper;
if (v.z < -upper) v.z = -upper;
// vVelocity = v;
// vVelocity = vec3(0.0, 0.0, 0.0);
vVelocity = v * 0.99;
//
float loc = 2.0*(aVertexPosition.x+1)/(num+1.0) - 1.0;
gl_Position = vec4(loc, aVertexPosition.y, 0.0, 1.0);
fLinear = aVertexPosition.y;
// fLinear = check(aVertexPosition.x);
}
</script>
<script id="phys-fs" type="x-shader/x-fragment">
varying highp vec3 vPosition;
varying highp vec3 vVelocity;
varying float fLinear;
const float prec = 255.0;
highp vec4 fixed_p(highp float x) {
x = x > 1.0 ? 1.0 : x;
x = x < 0.0 ? 0.0 : x;
float r = floor(x*prec);
x = x*prec - r;
float g = floor(x*prec);
x = x*prec - g;
float b = floor(x*prec);
x = x*prec - b;
// return vec4(r/256.0, g/256.0, 0.0, 1.0);
return vec4(r/prec, g/prec, x, 1.0);
}
highp vec4 fixed_v(highp float x) {
x = (x + 1.0) / 2.0;
x = x > 1.0 ? 1.0 : x;
x = x < 0.0 ? 0.0 : x;
float r = floor(x*prec);
x = x*prec - r;
float g = floor(x*prec);
x = x*prec - g;
float b = floor(x*prec);
x = x*prec - b;
// return vec4(r/256.0, g/256.0, 0.0, 1.0);
return vec4(r/prec, g/prec, x, 1.0);
}
void main(void) {
float n = ((fLinear + 1.0) / 2.0) * 6.0;
if (n < 1.0) {
gl_FragColor = fixed_p(vPosition.x);
}
else if (n < 2.0) {
gl_FragColor = fixed_p(vPosition.y);
}
else if (n < 3.0) {
gl_FragColor = fixed_p(vPosition.z);
}
else if (n < 4.0) {
gl_FragColor = fixed_v(vVelocity.x);
}
else if (n < 5.0) {
gl_FragColor = fixed_v(vVelocity.y);
}
else {
gl_FragColor = fixed_v(vVelocity.z);
}
}
</script>
<script type="text/javascript">
var gl;
function initGL(canvas) {
try {
gl = canvas.getContext("experimental-webgl");
gl.viewportWidth = canvas.width;
gl.viewportHeight = canvas.height;
} catch(e) {
}
if (!gl) {
alert("Could not initialise WebGL, sorry :-(");
}
}
function getShader(gl, id) {
var shaderScript = document.getElementById(id);
if (!shaderScript) {
return null;
}
var str = "";
var k = shaderScript.firstChild;
while (k) {
if (k.nodeType == 3) {
str += k.textContent;
}
k = k.nextSibling;
}
var shader;
if (shaderScript.type == "x-shader/x-fragment") {
shader = gl.createShader(gl.FRAGMENT_SHADER);
} else if (shaderScript.type == "x-shader/x-vertex") {
shader = gl.createShader(gl.VERTEX_SHADER);
} else {
return null;
}
gl.shaderSource(shader, str);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS)) {
alert(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
var shaderProgram;
function initShaders() {
var fragmentShader = getShader(gl, "per-fragment-lighting-fs");
var vertexShader = getShader(gl, "per-fragment-lighting-vs");
shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
shaderProgram.vertexNormalAttribute = gl.getAttribLocation(shaderProgram, "aVertexNormal");
shaderProgram.textureCoordAttribute = gl.getAttribLocation(shaderProgram, "aTextureCoord");
/*
*/
shaderProgram.pMatrixUniform = gl.getUniformLocation(shaderProgram, "uPMatrix");
shaderProgram.mvMatrixUniform = gl.getUniformLocation(shaderProgram, "uMVMatrix");
shaderProgram.nMatrixUniform = gl.getUniformLocation(shaderProgram, "uNMatrix");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
shaderProgram.pSamplerUniform = gl.getUniformLocation(shaderProgram, "uPos");
shaderProgram.materialShininessUniform = gl.getUniformLocation(shaderProgram, "uMaterialShininess");
shaderProgram.showSpecularHighlightsUniform = gl.getUniformLocation(shaderProgram, "uShowSpecularHighlights");
shaderProgram.useTexturesUniform = gl.getUniformLocation(shaderProgram, "uUseTextures");
shaderProgram.useLightingUniform = gl.getUniformLocation(shaderProgram, "uUseLighting");
shaderProgram.ambientColorUniform = gl.getUniformLocation(shaderProgram, "uAmbientColor");
shaderProgram.pointLightingLocationUniform = gl.getUniformLocation(shaderProgram, "uPointLightingLocation");
shaderProgram.pointLightingSpecularColorUniform = gl.getUniformLocation(shaderProgram, "uPointLightingSpecularColor");
shaderProgram.pointLightingDiffuseColorUniform = gl.getUniformLocation(shaderProgram, "uPointLightingDiffuseColor");
}
var physProgram;
function initPhysics() {
var fragmentShader = getShader(gl, "phys-fs");
var vertexShader = getShader(gl, "phys-vs");
var shaderProgram = gl.createProgram();
gl.attachShader(shaderProgram, vertexShader);
gl.attachShader(shaderProgram, fragmentShader);
gl.linkProgram(shaderProgram);
if (!gl.getProgramParameter(shaderProgram, gl.LINK_STATUS)) {
alert("Could not initialise shaders");
}
gl.useProgram(shaderProgram);
shaderProgram.vertexPositionAttribute = gl.getAttribLocation(shaderProgram, "aVertexPosition");
shaderProgram.samplerUniform = gl.getUniformLocation(shaderProgram, "uSampler");
physProgram = shaderProgram;
}
function handleLoadedTexture(texture) {
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, texture.image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_NEAREST);
gl.generateMipmap(gl.TEXTURE_2D);
gl.bindTexture(gl.TEXTURE_2D, null);
}
var earthTexture;
var galvanizedTexture;
function initTextures() {
earthTexture = gl.createTexture();
earthTexture.image = new Image();
earthTexture.image.onload = function() {
handleLoadedTexture(earthTexture)
}
earthTexture.image.src = "earth.jpg";
galvanizedTexture = gl.createTexture();
galvanizedTexture.image = new Image();
galvanizedTexture.image.onload = function() {
handleLoadedTexture(galvanizedTexture)
}
galvanizedTexture.image.src = "galvanized.jpg";
}
var mvMatrix;
var mvMatrixStack = [];
function mvPushMatrix(m) {
if (m) {
mvMatrixStack.push(m.dup());
mvMatrix = m.dup();
} else {
mvMatrixStack.push(mvMatrix.dup());
}
}
function mvPopMatrix() {
if (mvMatrixStack.length == 0) {
throw "Invalid popMatrix!";
}
mvMatrix = mvMatrixStack.pop();
return mvMatrix;
}
function loadIdentity() {
mvMatrix = Matrix.I(4);
}
function multMatrix(m) {
mvMatrix = mvMatrix.x(m);
}
function mvTranslate(v) {
var m = Matrix.Translation(v).ensure4x4();
multMatrix(m);
}
function createRotationMatrix(angle, v) {
var arad = angle * Math.PI / 180.0;
return Matrix.Rotation(arad, $V([v[0], v[1], v[2]])).ensure4x4();
}
function mvRotate(angle, v) {
multMatrix(createRotationMatrix(angle, v));
}
function setParami(prog, str, val) {
var loc = gl.getUniformLocation(prog, str);
gl.uniform1i(loc, val);
}
function setParamf(prog, str, val) {
var loc = gl.getUniformLocation(prog, str);
gl.uniform1f(loc, val);
}
var pMatrix;
function perspective(fovy, aspect, znear, zfar) {
pMatrix = makePerspective(fovy, aspect, znear, zfar);
}
function setMatrixUniforms() {
gl.uniformMatrix4fv(shaderProgram.pMatrixUniform, false, new WebGLFloatArray(pMatrix.flatten()));
gl.uniformMatrix4fv(shaderProgram.mvMatrixUniform, false, new WebGLFloatArray(mvMatrix.flatten()));
var normalMatrix = mvMatrix.inverse();
normalMatrix = normalMatrix.transpose();
gl.uniformMatrix4fv(shaderProgram.nMatrixUniform, false, new WebGLFloatArray(normalMatrix.flatten()));
}
var prec = 255;
function toFixed(x) {
x = x > 1.0 ? 1.0 : x;
var r = Math.floor(x*prec);
x = x*prec - r;
var g = Math.floor(x*prec);
x = x*prec - g;
var b = Math.floor(x*prec);
x = x*prec - b;
// return [r/prec, g/prec, x];
return [r, g, b];
}
function randomLocs(num) {
var locs = [];
for (var i = 0; i < num; i++) {
var s = 1.0;
locs[i] = [Math.random()*s - s/2 + 0.5, Math.random()*s - s/2 + 0.5, Math.random()*s -s/2 + 0.5];
// locs[i] = [Math.random(), Math.random(), Math.random()];
// locs[i] = [Math.random(), Math.random(), 0.0];
}
return locs;
}
function randomVels(num) {
var locs = [];
for (var i = 0; i < num; i++) {
var s = 0.001;
// locs[i] = [Math.random()*s - s/2 + 0.5, Math.random()*s - s/2 + 0.5, Math.random()*s -s/2 + 0.5];
// locs[i] = [Math.random()*s - s/2 + 0.5, Math.random()*s - s/2 + 0.5, 0.5];
locs[i] = [0.5, 0.5, 0.5];
}
return locs;
}
function makeData(dta, vdta, num) {
var buffer = null;
if (dta != null) {
buffer = new ArrayBuffer(3*6*num);
var c_data = new Uint8Array(buffer, 0);
for (var i = 0; i < num; i++) {
var x = toFixed(dta[i][0]);
c_data[i*3 + 0*num*3 + 0] = x[0];
c_data[i*3 + 0*num*3 + 1] = x[1];
c_data[i*3 + 0*num*3 + 2] = x[2];
var y = toFixed(dta[i][1]);
c_data[i*3 + 1*num*3 + 0] = y[0];
c_data[i*3 + 1*num*3 + 1] = y[1];
c_data[i*3 + 1*num*3 + 2] = y[2];
var z = toFixed(dta[i][2]);
c_data[i*3 + 2*num*3 + 0] = z[0];
c_data[i*3 + 2*num*3 + 1] = z[1];
c_data[i*3 + 2*num*3 + 2] = z[2];
var vx = toFixed(vdta[i][0]);
c_data[i*3 + 3*num*3 + 0] = vx[0];
c_data[i*3 + 3*num*3 + 1] = vx[1];
c_data[i*3 + 3*num*3 + 2] = vx[2];
var vy = toFixed(vdta[i][1]);
c_data[i*3 + 4*num*3 + 0] = vy[0];
c_data[i*3 + 4*num*3 + 1] = vy[1];
c_data[i*3 + 4*num*3 + 2] = vy[2];
var vz = toFixed(vdta[i][2]);
c_data[i*3 + 5*num*3 + 0] = vz[0];
c_data[i*3 + 5*num*3 + 1] = vz[1];
c_data[i*3 + 5*num*3 + 2] = vz[2];
}
}
return buffer;
}
function makeFBO(gl, w, h, dta) {
this.renderBuf = gl.createRenderbuffer();
this.frameBuf = gl.createFramebuffer();
this.texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, this.texture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, w, h, 0, gl.RGB, gl.UNSIGNED_BYTE, dta);
gl.bindTexture(gl.TEXTURE_2D, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, this.frameBuf);
gl.bindRenderbuffer(gl.RENDERBUFFER, this.renderBuf);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, w, h);
gl.bindRenderbuffer(gl.RENDERBUFFER, null);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, this.texture, 0);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, this.renderBuf);
// gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
// gl.clearColor(0.0, 0.0, 0.0, 1.0);
// gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
}
// These lines hold object data
var lineBuffer;
function initLines(num) {
lineBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, lineBuffer);
var vertices = [];
for (var i = 0; i < num; i++) {
vertices[i*6 + 0] = i; // 2.0*i/(num+1) - 1.0;
vertices[i*6 + 1] = -1.0;
vertices[i*6 + 2] = 0.0;
vertices[i*6 + 3] = i; // 2.0*i/(num+1) - 1.0;
vertices[i*6 + 4] = 1.0;
vertices[i*6 + 5] = 0.0;
}
gl.bufferData(gl.ARRAY_BUFFER, new WebGLFloatArray(vertices), gl.STATIC_DRAW);
lineBuffer.itemSize = 3;
lineBuffer.numItems = num*2;
}
// Spheres
var moonVertexPositionBuffer;
var moonVertexNormalBuffer;
var moonVertexTextureCoordBuffer;
var moonVertexIndexBuffer;
function initBuffers() {
var latitudeBands = 30;
var longitudeBands = 30;
var radius = 1;
var vertexPositionData = [];
var normalData = [];
var textureCoordData = [];
for (var latNumber = 0; latNumber <= latitudeBands; latNumber++) {
var theta = latNumber * Math.PI / latitudeBands;
var sinTheta = Math.sin(theta);
var cosTheta = Math.cos(theta);
for (var longNumber = 0; longNumber <= longitudeBands; longNumber++) {
var phi = longNumber * 2 * Math.PI / longitudeBands;
var sinPhi = Math.sin(phi);
var cosPhi = Math.cos(phi);
var x = cosPhi * sinTheta;
var y = cosTheta;
var z = sinPhi * sinTheta;
var u = 1 - (longNumber / longitudeBands);
var v = 1 - (latNumber / latitudeBands);
normalData.push(x);
normalData.push(y);
normalData.push(z);
textureCoordData.push(u);
textureCoordData.push(v);
vertexPositionData.push(radius * x);
vertexPositionData.push(radius * y);
vertexPositionData.push(radius * z);
}
}
var indexData = [];
for (var latNumber = 0; latNumber < latitudeBands; latNumber++) {
for (var longNumber = 0; longNumber < longitudeBands; longNumber++) {
var first = (latNumber * (longitudeBands + 1)) + longNumber;
var second = first + longitudeBands + 1;
indexData.push(first);
indexData.push(second);
indexData.push(first + 1);
indexData.push(second);
indexData.push(second + 1);
indexData.push(first + 1);
}
}
moonVertexNormalBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexNormalBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new WebGLFloatArray(normalData), gl.STATIC_DRAW);
moonVertexNormalBuffer.itemSize = 3;
moonVertexNormalBuffer.numItems = normalData.length / 3;
moonVertexTextureCoordBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexTextureCoordBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new WebGLFloatArray(textureCoordData), gl.STATIC_DRAW);
moonVertexTextureCoordBuffer.itemSize = 2;
moonVertexTextureCoordBuffer.numItems = textureCoordData.length / 2;
moonVertexPositionBuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexPositionBuffer);
gl.bufferData(gl.ARRAY_BUFFER, new WebGLFloatArray(vertexPositionData), gl.STATIC_DRAW);
moonVertexPositionBuffer.itemSize = 3;
moonVertexPositionBuffer.numItems = vertexPositionData.length / 3;
moonVertexIndexBuffer = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, moonVertexIndexBuffer);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new WebGLUnsignedShortArray(indexData), gl.STREAM_DRAW);
moonVertexIndexBuffer.itemSize = 1;
moonVertexIndexBuffer.numItems = indexData.length;
}
var diff = 0.0;
var teapotAngle = 180;
// Make a texture for ball locations
var posFBO1;
var posFBO2;
var turn = 0;
function handlePhysics() {
gl.disable(gl.DEPTH_TEST);
var oldFBO;
var newFBO;
if (turn == 0) {
oldFBO = posFBO1;
newFBO = posFBO2;
turn = 1;
}
else {
oldFBO = posFBO2;
newFBO = posFBO1;
turn = 0;
}
gl.bindFramebuffer(gl.FRAMEBUFFER, newFBO.frameBuf);
gl.useProgram(physProgram);
gl.enableVertexAttribArray(physProgram.vertexPositionAttribute);
// alert(gl.viewportWidth + ", " + gl.viewportHeight);
gl.viewport(0, 0, 1000, 6);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, oldFBO.texture);
// gl.bindTexture(gl.TEXTURE_2D, earthTexture);
gl.uniform1i(physProgram.samplerUniform, 0);
setParami(physProgram, "num_items", 1000);
gl.bindBuffer(gl.ARRAY_BUFFER, lineBuffer);
gl.vertexAttribPointer(physProgram.vertexPositionAttribute,
lineBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.LINES, 0, lineBuffer.numItems);
gl.disableVertexAttribArray(physProgram.vertexPositionAttribute);
}
function debugPhysics() {
gl.disable(gl.DEPTH_TEST);
var oldFBO;
var newFBO;
if (turn == 0) {
oldFBO = posFBO1;
newFBO = posFBO2;
}
else {
oldFBO = posFBO2;
newFBO = posFBO1;
}
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.useProgram(physProgram);
gl.enableVertexAttribArray(physProgram.vertexPositionAttribute);
// alert(gl.viewportWidth + ", " + gl.viewportHeight);
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, oldFBO.texture);
// gl.bindTexture(gl.TEXTURE_2D, earthTexture);
gl.uniform1i(physProgram.samplerUniform, 0);
setParami(physProgram, "num_items", 1000);
gl.bindBuffer(gl.ARRAY_BUFFER, lineBuffer);
gl.vertexAttribPointer(physProgram.vertexPositionAttribute,
lineBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.LINES, 0, lineBuffer.numItems);
gl.disableVertexAttribArray(physProgram.vertexPositionAttribute);
}
function drawScene() {
gl.enable(gl.DEPTH_TEST);
gl.depthFunc(gl.LEQUAL);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.useProgram(shaderProgram);
gl.enableVertexAttribArray(shaderProgram.vertexPositionAttribute);
gl.enableVertexAttribArray(shaderProgram.vertexNormalAttribute);
gl.enableVertexAttribArray(shaderProgram.textureCoordAttribute);
gl.viewport(0, 0, gl.viewportWidth, gl.viewportHeight);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
if (moonVertexPositionBuffer == null || moonVertexNormalBuffer == null || moonVertexTextureCoordBuffer == null || moonVertexIndexBuffer == null) {
return;
}
perspective(45, gl.viewportWidth / gl.viewportHeight, 0.1, 1000.0);
var specularHighlights = document.getElementById("specular").checked;
gl.uniform1i(shaderProgram.showSpecularHighlightsUniform, specularHighlights);
var lighting = document.getElementById("lighting").checked;
gl.uniform1i(shaderProgram.useLightingUniform, lighting);
if (lighting) {
gl.uniform3f(
shaderProgram.ambientColorUniform,
parseFloat(document.getElementById("ambientR").value),
parseFloat(document.getElementById("ambientG").value),
parseFloat(document.getElementById("ambientB").value)
);
gl.uniform3f(
shaderProgram.pointLightingLocationUniform,
parseFloat(document.getElementById("lightPositionX").value),
parseFloat(document.getElementById("lightPositionY").value),
parseFloat(document.getElementById("lightPositionZ").value)
);
gl.uniform3f(
shaderProgram.pointLightingSpecularColorUniform,
parseFloat(document.getElementById("specularR").value),
parseFloat(document.getElementById("specularG").value),
parseFloat(document.getElementById("specularB").value)
);
gl.uniform3f(
shaderProgram.pointLightingDiffuseColorUniform,
parseFloat(document.getElementById("diffuseR").value),
parseFloat(document.getElementById("diffuseG").value),
parseFloat(document.getElementById("diffuseB").value)
);
}
var texture = document.getElementById("texture").value;
gl.uniform1i(shaderProgram.useTexturesUniform, texture != "none");
gl.activeTexture(gl.TEXTURE0);
if (texture == "earth") {
gl.bindTexture(gl.TEXTURE_2D, earthTexture);
// gl.bindTexture(gl.TEXTURE_2D, posFBO1.texture);
} else if (texture == "galvanized") {
gl.bindTexture(gl.TEXTURE_2D, galvanizedTexture);
// gl.bindTexture(gl.TEXTURE_2D, posFBO1.texture);
}
gl.uniform1i(shaderProgram.samplerUniform, 0);
gl.activeTexture(gl.TEXTURE1);
if (turn == 1) {
gl.bindTexture(gl.TEXTURE_2D, posFBO1.texture);
} else {
gl.bindTexture(gl.TEXTURE_2D, posFBO2.texture);
}
gl.uniform1i(shaderProgram.pSamplerUniform, 1);
gl.uniform1f(shaderProgram.materialShininessUniform, parseFloat(document.getElementById("shininess").value));
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexPositionBuffer);
gl.vertexAttribPointer(shaderProgram.vertexPositionAttribute, moonVertexPositionBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexTextureCoordBuffer);
gl.vertexAttribPointer(shaderProgram.textureCoordAttribute, moonVertexTextureCoordBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ARRAY_BUFFER, moonVertexNormalBuffer);
gl.vertexAttribPointer(shaderProgram.vertexNormalAttribute, moonVertexNormalBuffer.itemSize, gl.FLOAT, false, 0, 0);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, moonVertexIndexBuffer);
loadIdentity();
mvTranslate($V([0.0,0.0,-100.0]));
mvRotate(23.4, [1, 0, -1]);
mvRotate(teapotAngle, [0, 1, 0]);
setMatrixUniforms();
for (var i = 0; i < 1000; i++) {
setParamf(shaderProgram, "number", i);
gl.drawElements(gl.TRIANGLES, moonVertexIndexBuffer.numItems, gl.UNSIGNED_SHORT, 0);
}
diff += 1;
gl.disableVertexAttribArray(shaderProgram.vertexPositionAttribute);
gl.disableVertexAttribArray(shaderProgram.vertexNormalAttribute);
gl.disableVertexAttribArray(shaderProgram.textureCoordAttribute);
}
var lastTime = 0;
function animate() {
var timeNow = new Date().getTime();
if (lastTime != 0) {
var elapsed = timeNow - lastTime;
teapotAngle += 0.05 * elapsed;
}
lastTime = timeNow;
// updateBalls();
}
function tick() {
//drawScene();
animate();
diff += 1.0;
document.getElementById("diff").value = diff;
handlePhysics();
// debugPhysics();
drawScene();
}
function webGLStart() {
var canvas = document.getElementById("lesson14-canvas");
initGL(canvas);
initShaders();
initPhysics();
initTextures();
initBuffers();
initLines(1000);
var locs = randomLocs(1000);
var vels = randomVels(1000);
var dta = makeData(locs, vels, 1000);
posFBO1 = new makeFBO(gl, 1000, 6, dta);
posFBO2 = new makeFBO(gl, 1000, 6, dta);
gl.clearColor(0.0, 0.0, 0.0, 1.0);
gl.clearDepth(1.0);
setInterval(tick, 15);
}
/*
<canvas id="lesson14-canvas" style="border: none;" width="1000" height="30"></canvas>
<canvas id="lesson14-canvas" style="border: none;" width="500" height="500"></canvas>
*/
</script>
</head>
<body onload="webGLStart();">
<canvas id="lesson14-canvas" style="border: none;" width="600" height="600"></canvas>
<br/>
<td>Diff: <input type="text" id="diff" value="0" />
<input type="checkbox" id="specular" checked /> Show specular highlight<br/>
<input type="checkbox" id="lighting" checked /> Use lighting<br/>
Texture:
<select id="texture">
<option value="none">None</option>
<option selected value="galvanized">Galvanized</option>
<option value="earth">Earth</option>
</select>
<br/>
<h2>Material:</h2>
<table style="border: 0; padding: 10px;">
<tr>
<td><b>Shininess:</b>
<td><input type="text" id="shininess" value="32.0" />
</tr>
</table>
<h2>Point light:</h2>
<table style="border: 0; padding: 10px;">
<tr>
<td><b>Location:</b>
<td>X: <input type="text" id="lightPositionX" value="-10.0" />