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lightball03-vertex-shader-discard.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>WebGL triangles mapped to texels</title>
<style>
html, body {
width: 100%;
height: 100%;
border: 0px;
padding: 0px;
margin: 0px;
background-color: red;
font-family: monospace;
overflow: hidden;
color: #fff;
}
a {
color: #fff;
}
#info {
font-size: small;
position: absolute;
top: 0px; width: 100%;
padding: 5px;
text-align: center;
z-index: 2;
}
CANVAS {
background-color: gray;
}
.fpsContainer {
position: absolute;
top: 10px;
left: 10px;
z-index: 2;
color: white;
background-color: rgba(0,0,0,0.5);
border-radius: 10px;
padding: 10px;
}
#viewContainer {
width: 100%;
height: 100%;
}
</style>
<script type="text/javascript" src="js/tdl.min.js"></script>
<script type="text/javascript">
//tdl.require('tdl.buffers');
//tdl.require('tdl.fast');
//tdl.require('tdl.fps');
//tdl.require('tdl.log');
//tdl.require('tdl.math');
//tdl.require('tdl.models');
//tdl.require('tdl.primitives');
//tdl.require('tdl.programs');
//tdl.require('tdl.textures');
//tdl.require('tdl.webgl');
window.onload = initialize;
// globals
var gl; // the gl context.
var canvas; // the canvas
var math; // the math lib.
var fast; // the fast math lib.
var g_eyeSpeed = 0.1;
var g_eyeHeight = 2;
var g_eyeRadius = 9;
var g_visTexture;
var g_visCanvas = document.createElement("canvas");
var g_visCanvasCtx = g_visCanvas.getContext("2d");
var expandIndexedVertices = function(arrays) {
var indices = arrays.indices;
var numVerts = indices.numElements * 3;
var newArrays = {};
Object.keys(arrays).forEach(function(key) {
if (key !== 'indices') {
var srcArray = arrays[key]
var dstArray = new tdl.primitives.AttribBuffer(srcArray.numComponents, numVerts, srcArray.type);
newArrays[key] = dstArray;
for (var ndx = 0; ndx < numVerts; ++ndx) {
var verts = indices.getElement(ndx);
dstArray.push(srcArray.getElement(verts[0]));
dstArray.push(srcArray.getElement(verts[1]));
dstArray.push(srcArray.getElement(verts[2]));
}
}
});
return newArrays;
}
function createProgramFromTags(vertexTagId, fragmentTagId) {
return tdl.programs.loadProgram(
document.getElementById(vertexTagId).text,
document.getElementById(fragmentTagId).text);
}
/**
* Sets up Planet.
*/
function setupSphere() {
var textures = {};
var program = createProgramFromTags(
'sphereVertexShader',
'sphereFragmentShader');
var numAcross = 48;
var numDown = 24;
var arrays = tdl.primitives.createSphere(4, numAcross, numDown);
arrays = expandIndexedVertices(arrays);
// in this case since we know the sphere is 48x24 quads lets make the texture 48x48 (since we're doing triangles)
// Let's use a canvas for it so we can draw to the canvas to update
g_visCanvas.width = numAcross;
g_visCanvas.height = numDown * 2;
g_visTexture = tdl.textures.loadTexture(canvas);
g_visTexture.setParameter(gl.TEXTURE_MIN_FILTER, gl.NEAREST);
g_visTexture.setParameter(gl.TEXTURE_MAG_FILTER, gl.NEAREST);
textures.visTexture = g_visTexture;
var numVerts = arrays.position.numElements;
arrays.extraUV = new tdl.primitives.AttribBuffer(2, numVerts);
var trisAcross = numAcross * 2;
// for whatever reason tdl spheres are made by columns not rows.
for (var ii = 0; ii < numVerts; ++ii) {
var tri = Math.floor(ii / 3);
var quad = Math.floor(tri / 2);
var col = Math.floor(quad / numDown);
var row = Math.floor(quad % numDown) * 2 + (tri % 2);
var u = (col + 0.5) / g_visCanvas.width;
var v = (row + 0.5) / g_visCanvas.height;
arrays.extraUV.push([u, v]);
}
return new tdl.models.Model(program, arrays, textures);
}
function setupCube() {
var textures = {};
var program = createProgramFromTags(
'cubeVertexShader',
'cubeFragmentShader');
var arrays = tdl.primitives.createCube(2);
return new tdl.models.Model(program, arrays, textures);
}
var numberSuffix = (function() {
var suffixes = [ "th", "st", "nd", "rd" ];
return function(v) {
return suffixes[v] || "th";
};
}());
function initialize() {
math = tdl.math;
fast = tdl.fast;
canvas = document.getElementById("canvas");
gl = tdl.webgl.setupWebGL(canvas, { alpha: false });
if (!gl) {
return false;
}
var sphere = setupSphere();
var cube = setupCube();
var then = 0.0;
var clock = 0.0;
// pre-allocate a bunch of arrays
var projection = new Float32Array(16);
var view = new Float32Array(16);
var world = new Float32Array(16);
var worldInverse = new Float32Array(16);
var worldInverseTranspose = new Float32Array(16);
var viewProjection = new Float32Array(16);
var worldViewProjection = new Float32Array(16);
var viewInverse = new Float32Array(16);
var viewProjectionInverse = new Float32Array(16);
var eyePosition = new Float32Array(3);
var target = new Float32Array(3);
var up = new Float32Array([0,1,0]);
var lightWorldPos = new Float32Array(3);
var v3t0 = new Float32Array(3);
var v3t1 = new Float32Array(3);
var v3t2 = new Float32Array(3);
var v3t3 = new Float32Array(3);
var m4t0 = new Float32Array(16);
var m4t1 = new Float32Array(16);
var m4t2 = new Float32Array(16);
var m4t3 = new Float32Array(16);
var zero4 = new Float32Array(4);
var one4 = new Float32Array([1,1,1,1]);
// Sphere uniforms.
var sphereConst = {
viewInverse: viewInverse,
lightWorldPos: lightWorldPos,
specular: one4,
shininess: 50,
specularFactor: 0.2};
var spherePer = {
lightColor: new Float32Array([0,0,0,1]),
world: world,
worldViewProjection: worldViewProjection,
worldInverse: worldInverse,
worldInverseTranspose: worldInverseTranspose,
triMod: 10,
triToHide: 5,
};
function updateVizTexture(ctx, frameCount, clock) {
var w = ctx.canvas.width;
var h = ctx.canvas.height;
ctx.clearRect(0, 0, w, h);
ctx.save();
ctx.translate(w * 0.5 + Math.sin(clock) * w * 0.5, 0);
ctx.fillStyle = "#fff";
ctx.fillRect(-3, 0, 6, h);
ctx.restore();
ctx.save();
ctx.translate(0, h * 0.5 + Math.sin(clock * 1.37) * h * 0.5);
ctx.fillStyle = "rgba(0,0,255,0.5)";
ctx.fillRect(0, -3, w, 6);
ctx.restore();
ctx.save();
ctx.translate(w * 0.5, h * 0.5);
ctx.rotate(clock * 0.831);
ctx.fillStyle = "rgba(0,255,25,0.5)";
ctx.fillRect(-w, -3, w * 2, 6);
ctx.restore();
g_visTexture.setTexture(ctx.canvas);
}
document.getElementById("tex").appendChild(g_visCanvas);
g_visCanvas.style.border = "1px solid red";
g_visCanvas.style.backgroundImage = 'url("assets/checker.png")';
var frameCount = 0;
function render() {
updateVizTexture(g_visCanvasCtx, frameCount, clock);
++frameCount;
var now = (new Date()).getTime() * 0.001;
var elapsedTime;
if(then == 0.0) {
elapsedTime = 0.0;
} else {
elapsedTime = now - then;
}
then = now;
clock += elapsedTime;
eyePosition[0] = Math.sin(clock * g_eyeSpeed) * g_eyeRadius;
eyePosition[1] = g_eyeHeight;
eyePosition[2] = Math.cos(clock * g_eyeSpeed) * g_eyeRadius;
gl.clearColor(0,0,0,0);
gl.clearDepth(1);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT);
gl.enable(gl.CULL_FACE);
gl.enable(gl.DEPTH_TEST);
gl.enable(gl.BLEND);
gl.blendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA);
fast.matrix4.perspective(
projection,
math.degToRad(60),
canvas.clientWidth / canvas.clientHeight,
1,
5000);
fast.matrix4.lookAt(
view,
eyePosition,
target,
up);
fast.matrix4.mul(viewProjection, view, projection);
fast.matrix4.inverse(viewInverse, view);
fast.matrix4.inverse(viewProjectionInverse, viewProjection);
fast.matrix4.getAxis(v3t0, viewInverse, 0); // x
fast.matrix4.getAxis(v3t1, viewInverse, 1); // y;
fast.matrix4.getAxis(v3t2, viewInverse, 2); // z;
fast.mulScalarVector(v3t0, 10, v3t0);
fast.mulScalarVector(v3t1, 10, v3t1);
fast.mulScalarVector(v3t2, 10, v3t2);
fast.addVector(lightWorldPos, eyePosition, v3t0);
fast.addVector(lightWorldPos, lightWorldPos, v3t1);
fast.addVector(lightWorldPos, lightWorldPos, v3t2);
// view: view,
// projection: projection,
// viewProjection: viewProjection,
var lightColor = spherePer.lightColor;
lightColor[0] = 1;
lightColor[1] = 1;
lightColor[2] = 1;
var scale = 1;
fast.matrix4.scaling(m4t0, [scale, scale, scale]);
fast.matrix4.translation(m4t1, [0, 0, 0]);
fast.matrix4.mul(world, m4t0, m4t1);
fast.matrix4.mul(worldViewProjection, world, viewProjection);
fast.matrix4.inverse(worldInverse, world);
fast.matrix4.transpose(worldInverseTranspose, worldInverse);
cube.drawPrep(sphereConst);
cube.draw(spherePer);
sphere.drawPrep(sphereConst);
sphere.draw(spherePer);
tdl.webgl.requestAnimationFrame(render, canvas);
}
render();
return true;
}
</script>
</head>
<body>
<div id="info"><a href="http://threedlibrary.googlecode.com" target="_blank">tdl.js</a> - triangles mapped to texels example</div>
<div class="fpsContainer">
<div id="tex"></div>
</div>
<div id="viewContainer">
<canvas id="canvas" width="1024" height="1024" style="width: 100%; height: 100%;"></canvas>
</div>
</body>
<script id="sphereVertexShader" type="text/something-not-javascript">
uniform mat4 worldViewProjection;
uniform vec3 lightWorldPos;
uniform mat4 world;
uniform mat4 viewInverse;
uniform mat4 worldInverseTranspose;
uniform sampler2D visTexture;
attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord;
attribute vec2 extraUV;
varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;
varying vec4 v_extraColor;
void main() {
v_texCoord = texCoord;
v_position = (worldViewProjection * position);
v_normal = (worldInverseTranspose * vec4(normal, 0)).xyz;
v_surfaceToLight = lightWorldPos - (world * position).xyz;
v_surfaceToView = (viewInverse[3] - (world * position)).xyz;
gl_Position = v_position;
vec4 vis = texture2D(visTexture, extraUV);
// lets not draw at all if alph is low
if (vis.a < 0.1) {
gl_Position = vec4(0, 0, 2, 1); // put the vertex behind the camera
}
v_extraColor = vis;
}
</script>
<script id="sphereFragmentShader" type="text/something-not-javascript">
precision mediump float;
uniform vec4 lightColor;
varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;
varying vec4 v_extraColor;
uniform vec4 specular;
uniform sampler2D bumpSampler;
uniform float shininess;
uniform float specularFactor;
vec4 lit(float l ,float h, float m) {
return vec4(1.0,
max(l, 0.0),
(l > 0.0) ? pow(max(0.0, h), m) : 0.0,
1.0);
}
void main() {
vec3 normal = normalize(v_normal);
vec3 surfaceToLight = normalize(v_surfaceToLight);
vec3 surfaceToView = normalize(v_surfaceToView);
vec3 halfVector = normalize(surfaceToLight + surfaceToView);
vec4 litR = lit(dot(normal, surfaceToLight),
dot(normal, halfVector), shininess);
gl_FragColor = vec4((
lightColor * (litR.y
+ specular * litR.z * specularFactor)).rgb,
1) * v_extraColor;
}
</script>
<script id="cubeVertexShader" type="text/something-not-javascript">
uniform mat4 worldViewProjection;
uniform vec3 lightWorldPos;
uniform mat4 world;
uniform mat4 viewInverse;
uniform mat4 worldInverseTranspose;
attribute vec4 position;
attribute vec3 normal;
attribute vec2 texCoord;
varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;
void main() {
v_texCoord = texCoord;
v_position = (worldViewProjection * position);
v_normal = (worldInverseTranspose * vec4(normal, 0)).xyz;
v_surfaceToLight = lightWorldPos - (world * position).xyz;
v_surfaceToView = (viewInverse[3] - (world * position)).xyz;
gl_Position = v_position;
}
</script>
<script id="cubeFragmentShader" type="text/something-not-javascript">
precision mediump float;
uniform vec4 lightColor;
varying vec4 v_position;
varying vec2 v_texCoord;
varying vec3 v_normal;
varying vec3 v_surfaceToLight;
varying vec3 v_surfaceToView;
uniform vec4 specular;
uniform sampler2D bumpSampler;
uniform float shininess;
uniform float specularFactor;
vec4 lit(float l ,float h, float m) {
return vec4(1.0,
max(l, 0.0),
(l > 0.0) ? pow(max(0.0, h), m) : 0.0,
1.0);
}
void main() {
vec3 normal = normalize(v_normal);
vec3 surfaceToLight = normalize(v_surfaceToLight);
vec3 surfaceToView = normalize(v_surfaceToView);
vec3 halfVector = normalize(surfaceToLight + surfaceToView);
vec4 litR = lit(dot(normal, surfaceToLight),
dot(normal, halfVector), shininess);
gl_FragColor = vec4((
lightColor * (litR.y
+ specular * litR.z * specularFactor)).rgb,
1);
}
</script>
</html>