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scribble01.html
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<!--
* Copyright 2015, Greggman.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Greggman. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-->
<html>
<head>
<meta charset="utf-8">
<title>Scribble</title>
<style>
html, body {
width: 100%;
height: 100%;
padding: 0px;
margin: 0px;
overflow: hidden;
}
canvas {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<canvas id="c"></canvas>
</body>
<script id="sphereVertexShader" type="text/something-not-javascript">
uniform mat4 worldViewProjection;
uniform sampler2D u_random;
uniform vec4 u_scale;
uniform vec2 u_offset;
attribute vec4 position;
varying vec4 v_position;
void main() {
vec4 random = texture2D(u_random, position.xy + u_offset);
gl_Position = (worldViewProjection * (position + random * u_scale));
v_position = gl_Position;
}
</script>
<script id="sphereFragmentShader" type="text/something-not-javascript">
precision mediump float;
uniform vec4 u_color;
uniform sampler2D u_random;
varying vec4 v_position;
void main() {
vec4 rand = texture2D(u_random, (v_position.xy * 0.1) + (gl_FragCoord.xy) * 0.001);
float m = rand.x * rand.y;
//m = step(0.3, m);
m = 0.65 - m;
m = m * (2.0 - (v_position.z * 0.5 + 0.5));
vec4 color = u_color;
color = vec4(0,0,0,1);
gl_FragColor = mix(vec4(1,1,1,1), color, m);
}
</script>
<script type="text/javascript" src="js/typeface-0.15.js"></script>
<script type="text/javascript" src="js/tdl.min.js"></script>
<script type="text/javascript">
var g = {
across: 4,
hdiv: 5,
vdiv: 4,
};
// globals
var gl; // the gl context.
var canvas; // the canvas
var math; // the math lib.
var fast; // the fast math lib.
var g_logGLCalls = true; // whether or not to log webgl calls
var g_debug = false; // whether or not to debug.
var g_drawOnce = false; // draw just one frame.
//g_drawOnce = true;
//g_debug = true;
var g_eyeSpeed = 0.05;
var g_eyeHeight = 2;
var g_eyeRadius = 4;
function ValidateNoneOfTheArgsAreUndefined(functionName, args) {
for (var ii = 0; ii < args.length; ++ii) {
if (args[ii] === undefined) {
tdl.error("undefined passed to gl." + functionName + "(" +
tdl.webgl.glFunctionArgsToString(functionName, args) + ")");
}
}
}
function Log(msg) {
if (g_logGLCalls) {
tdl.log(msg);
}
}
function LogGLCall(functionName, args) {
if (g_logGLCalls) {
ValidateNoneOfTheArgsAreUndefined(functionName, args)
tdl.log("gl." + functionName + "(" +
tdl.webgl.glFunctionArgsToString(functionName, args) + ")");
}
}
function createProgramFromTags(vertexTagId, fragmentTagId) {
return tdl.programs.loadProgram(
document.getElementById(vertexTagId).text,
document.getElementById(fragmentTagId).text);
}
/**
* Sets up Planet.
*/
function setupSphere() {
var randomPixels = {
width: 256,
height: 256,
};
var pixels = new Uint8Array(randomPixels.width * randomPixels.height * 4);
for (var ii = 0; ii < pixels.length; ++ii) {
pixels[ii] = Math.random() * 256;
}
randomPixels.pixels = pixels;
var textures = {
u_random: new tdl.textures.ColorTexture(randomPixels),
};
var program = createProgramFromTags(
'sphereVertexShader',
'sphereFragmentShader');
var arrays = tdl.primitives.createSphere(0.4, g.hdiv, g.vdiv);
return new tdl.models.Model(program, arrays, textures, gl.LINES);
}
function initialize() {
math = tdl.math;
fast = tdl.fast;
canvas = document.getElementById("c");
gl = tdl.webgl.setupWebGL(canvas, {alpha: false});
if (!gl) {
return false;
}
if (g_debug) {
gl = tdl.webgl.makeDebugContext(gl, undefined, LogGLCall);
}
tdl.misc.applyUrlSettings(g);
Log("--Setup Sphere---------------------------------------");
var sphere = setupSphere();
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 = {
};
var spherePer = {
worldViewProjection: worldViewProjection,
u_color: new Float32Array([1, 1, 1, 1]),
u_scale: new Float32Array([0.1, 0.1, 0.1, 0]),
u_offset: new Float32Array([1, 1]),
};
var resize = function(gl) {
var width = gl.canvas.clientWidth;
var height = gl.canvas.clientHeight;
if (width != gl.canvas.width || height != gl.canvas.height) {
gl.canvas.width = width;
gl.canvas.height = height;
}
};
var frameCount = 0;
var wiggleClock = 0;
function render() {
++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;
if (frameCount % 5 == 0)
{
wiggleClock = clock;
}
resize(gl);
gl.viewport(0, 0, gl.canvas.width, gl.canvas.height);
eyePosition[0] = Math.sin(clock * g_eyeSpeed) * g_eyeRadius;
eyePosition[1] = g_eyeHeight;
eyePosition[2] = Math.cos(clock * g_eyeSpeed) * g_eyeRadius;
gl.colorMask(true, true, true, true);
gl.depthMask(true);
gl.clearColor(1, 1, 1, 1);
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.lineWidth(1);
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,
Log("--Draw sphere---------------------------------------");
sphere.drawPrep(sphereConst);
var across = g.across;
var color = spherePer.u_color;
var half = (across - 1) * 0.5;
for (var xx = 0; xx < across; ++xx) {
for (var yy = 0; yy < across; ++yy) {
for (var zz = 0; zz < across; ++zz) {
color[0] = xx / across;
color[1] = yy / across;
color[2] = zz / across;
spherePer.u_offset[0] = xx / across + wiggleClock;
spherePer.u_offset[1] = yy / across + wiggleClock;
var scale = (xx + yy + zz) % 4 / 4 + 0.5;
fast.matrix4.scaling(m4t0, [scale, scale, scale]);
fast.matrix4.translation(m4t1, [xx - half, yy - half, zz - half]);
fast.matrix4.mul(world, m4t0, m4t1);
fast.matrix4.translation(world, [xx - half, yy - half, zz - half]);
fast.matrix4.mul(worldViewProjection, world, viewProjection);
fast.matrix4.inverse(worldInverse, world);
fast.matrix4.transpose(worldInverseTranspose, worldInverse);
sphere.draw(spherePer);
}
}
}
// turn off logging after 1 frame.
g_logGLCalls = false;
if (!g_drawOnce) {
tdl.webgl.requestAnimationFrame(render, canvas);
}
}
render();
return true;
}
initialize();
</script>
</html>