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waves5.html
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<!DOCTYPE html>
<html>
<head>
<!--
Ray Marching demo by Kevin Roast
- Lots of code/ideas for this demo come from reading:
http://www.iquilezles.org/www/material/nvscene2008/rwwtt.pdf
http://www.pouet.net/topic.php?which=7931&page=1
http://www.pouet.net/topic.php?which=7920&page=1
http://iquilezles.org/www/articles/distfunctions/distfunctions.htm
https://www.shadertoy.com/
If you want to understand this stuff read through the PDF and pouet.net links above!
-->
<script src="scripts/utils.js"></script>
<script src="scripts/dat.gui.min.js"></script>
<script src="scripts/stats.min.js"></script>
<script id="vertex" type="x-shader">
attribute vec2 aVertexPosition;
void main()
{
gl_Position = vec4(aVertexPosition, 0.0, 1.0);
}
</script>
<script id="fragment" type="x-shader">
#ifdef GL_ES
precision highp float;
#endif
uniform float time;
uniform vec2 resolution;
uniform vec3 cameraPos;
uniform vec3 cameraLookat;
uniform vec3 lightDir;
uniform vec3 lightColour;
uniform float specular;
uniform float specularHardness;
uniform float fog;
uniform vec3 diffuse;
uniform bool postEffects;
uniform bool moveCamera;
uniform bool reflections;
uniform float attenDepth;
uniform float attenScale;
uniform float param;
//#define AA
#define GAMMA 0.8
#define CONTRAST 1.1
#define SATURATION 1.3
#define BRIGHTNESS 1.3
#ifndef AA
#define NOISE_PASSES 6
#define RAY_DEPTH 256
#define MAX_DEPTH 200.0
#define DISTANCE_MIN 0.003
#else
#define ANTIALIAS_SAMPLES 16
#define NOISE_PASSES 8
#define RAY_DEPTH 256
#define MAX_DEPTH 200.0
#define DISTANCE_MIN 0.003
#endif
#define PI 3.14159265
const vec3 WATER_COLOR = vec3(0.6,0.85,0.65);
const vec3 SPECULAR_COLOR = vec3(1.1,0.8,0.6);
const vec2 delta = vec2(DISTANCE_MIN, 0.);
float Hash(in float n)
{
return fract(sin(n)*43758.5453123);
}
float Noise(in vec2 x)
{
vec2 p = floor(x);
vec2 f = fract(x);
f = f*f*(3.0-2.0*f);
float n = p.x + p.y*57.0;
float res = mix(mix( Hash(n+ 0.0), Hash(n+ 1.0),f.x),
mix( Hash(n+ 57.0), Hash(n+ 58.0),f.x),f.y);
return res;
}
// FAST32_hash
// A very fast hashing function. Requires 32bit support.
// http://briansharpe.wordpress.com/2011/11/15/a-fast-and-simple-32bit-floating-point-hash-function/
void FAST32_hash_2D( vec2 gridcell, out vec4 hash_0, out vec4 hash_1 )
{
// gridcell is assumed to be an integer coordinate
const vec2 OFFSET = vec2( 26.0, 161.0 );
const float DOMAIN = 71.0;
const vec2 SOMELARGEFLOATS = vec2( 951.135664, 642.949883 );
vec4 P = vec4( gridcell.xy, gridcell.xy + 1.0 );
P = P - floor(P * ( 1.0 / DOMAIN )) * DOMAIN;
P += OFFSET.xyxy;
P *= P;
P = P.xzxz * P.yyww;
hash_0 = fract( P * ( 1.0 / SOMELARGEFLOATS.x ) );
hash_1 = fract( P * ( 1.0 / SOMELARGEFLOATS.y ) );
}
vec2 Interpolation_C2( vec2 x ) { return x * x * x * (x * (x * 6.0 - 15.0) + 10.0); }
// Perlin Noise 2D ( gradient noise )
// Return value range of -1.0->1.0
// http://briansharpe.files.wordpress.com/2011/11/perlinsample.jpg
float Perlin2D( vec2 P )
{
// establish our grid cell and unit position
vec2 Pi = floor(P);
vec4 Pf_Pfmin1 = P.xyxy - vec4( Pi, Pi + 1.0 );
// calculate the hash.
vec4 hash_x, hash_y;
FAST32_hash_2D( Pi, hash_x, hash_y );
// calculate the gradient results
vec4 grad_x = hash_x - 0.49999;
vec4 grad_y = hash_y - 0.49999;
vec4 grad_results = inversesqrt( grad_x * grad_x + grad_y * grad_y ) * ( grad_x * Pf_Pfmin1.xzxz + grad_y * Pf_Pfmin1.yyww );
// Classic Perlin Interpolation
grad_results *= 1.4142135623730950488016887242097;
vec2 blend = Interpolation_C2( Pf_Pfmin1.xy );
vec4 blend2 = vec4( blend, vec2( 1.0 - blend ) );
return dot( grad_results, blend2.zxzx * blend2.wwyy );
}
// Octave transform matrix from Alexander Alekseev aka TDM
mat2 octave_m = mat2(1.6,1.2,-1.2,1.6);
// FBM Noise - mixing Value noise and Perlin Noise - also ridged turbulence at smaller octaves
float FractalNoise(in vec2 xy)
{
float m = 1.25;
float w = 0.6;
float f = 0.0;
for (int i = 0; i < NOISE_PASSES; i++)
{
f += Noise(xy.xy+time*0.655) * m * 0.25;
if (i < 2)
{
f += Perlin2D(xy.yx-time*0.233) * w * 0.12;
}
else
{
// ridged turbulence at smaller scales - moves 4x faster
f += abs(Perlin2D(xy.yx-time*0.932) * w * 0.05)*1.75;
}
w *= 0.45;
m *= 0.35;
xy *= octave_m;
}
return f;
}
float Dist(vec3 pos)
{
return dot(pos-vec3(0.,-FractalNoise(pos.xz),0.), vec3(0.,1.,0.));
}
vec3 GetNormal(vec3 pos)
{
vec3 n;
n.x = Dist( pos + delta.xyy ) - Dist( pos - delta.xyy );
n.y = Dist( pos + delta.yxy ) - Dist( pos - delta.yxy );
n.z = Dist( pos + delta.yyx ) - Dist( pos - delta.yyx );
return normalize(n);
}
// Original method by David Hoskins
vec3 Sky(in vec3 rd)
{
float sunAmount = max(dot(rd, lightDir), 0.0);
float v = pow(1.0 - max(rd.y,0.0),6.);
vec3 sky = mix(vec3(.1, .2, .25)*1.5, vec3(.32, .32, .35)*1.5, v);
sky += SPECULAR_COLOR * pow(sunAmount, 200.0);
return clamp(sky, 0.0, 1.0);
}
// Fog routine - original by IQ
vec3 Fog(vec3 rgb, vec3 rd, float distance)
{
float fogAmount = 1.0 - exp(-distance*fog);
vec3 fogColor = Sky(rd);
return mix(rgb, fogColor, fogAmount);
}
vec3 Shading(vec3 pos, vec3 rd, vec3 norm, vec3 ro)
{
vec3 light = lightColour * max(0.0, dot(norm, lightDir));
vec3 view = normalize(-rd);
vec3 heading = normalize(view + lightDir);
float spec = pow(max(0.0, dot(heading, norm)), specularHardness);
float fresnel = 0.0;
if (reflections)
{
fresnel = pow(1.0 - dot(view, norm), 5.0);
fresnel = mix(0.0, 1.0, min(1.0, fresnel));
}
light = (diffuse * light) + (spec * specular * SPECULAR_COLOR) * (1.0-fresnel);
if (fresnel > 0.0)
{
vec3 refrd = reflect(rd, norm);
light += Sky(refrd) * fresnel;
}
// attenuation
vec3 dist = pos - ro;
float atten = max(1.0 - dot(dist,dist) * 0.0001, 0.0);
light += WATER_COLOR * (pos.y - attenDepth) * attenScale * atten;
light = Fog(light, rd, length(ro-pos));
return light;
}
// Original method by David Hoskins
vec3 PostEffects(vec3 rgb, vec2 xy)
{
rgb = pow(rgb, vec3(GAMMA));
rgb = mix(vec3(.5), mix(vec3(dot(vec3(.2125, .7154, .0721), rgb*BRIGHTNESS)), rgb*BRIGHTNESS, SATURATION), CONTRAST);
rgb *= .4+0.5*pow(40.0*xy.x*xy.y*(1.0-xy.x)*(1.0-xy.y), 0.2 );
return rgb;
}
// Camera function by TekF
// Compute ray from camera parameters
vec3 GetRay(vec3 dir, vec2 pos)
{
pos = pos - 0.5;
pos.x *= resolution.x/resolution.y;
dir = normalize(dir);
vec3 right = normalize(cross(vec3(0.,1.,0.),dir));
vec3 up = normalize(cross(dir,right));
return dir + right*pos.x + up*pos.y;
}
vec4 March(vec3 ro, vec3 rd)
{
float t = 0.0;
float d = 1.0;
for (int i=0; i<RAY_DEPTH; i++)
{
vec3 p = ro + rd * t;
d = Dist(p);
if (d < DISTANCE_MIN)
{
return vec4(p, 1.0);
}
t += d;
if (t >= MAX_DEPTH) break;
}
return vec4(0.0);
}
void main()
{
vec3 off = vec3(0.0);
if (moveCamera) off.z -= time*0.25;
vec4 res = vec4(0.0);
#ifndef AA
vec2 p = gl_FragCoord.xy / resolution.xy;
vec3 ro = cameraPos + off;
vec3 rd = normalize(GetRay((cameraLookat-off)-cameraPos+off, p));
res = March(ro, rd);
if (res.a == 1.0) res.rgb = Shading(res.rgb, rd, GetNormal(res.rgb), ro).rgb;
else res.rgb = Sky(rd);
#else
vec2 p;
float d_ang = 2.*PI / float(ANTIALIAS_SAMPLES);
float ang = d_ang * 0.33333;
float r = 0.3;
for (int i = 0; i < ANTIALIAS_SAMPLES; i++)
{
p = vec2((gl_FragCoord.x + cos(ang)*r) / resolution.x, (gl_FragCoord.y + sin(ang)*r) / resolution.y);
vec3 ro = cameraPos + off;
vec3 rd = normalize(GetRay((cameraLookat-off)-cameraPos+off, p));
vec4 _res = March(ro, rd);
if (_res.a == 1.0) _res.rgb = Shading(_res.rgb, rd, GetNormal(_res.rgb), ro).rgb;
else _res.rgb = Sky(rd);
ang += d_ang;
res.rgb += _res.rgb;
}
res /= float(ANTIALIAS_SAMPLES);
#endif
if (postEffects) res.rgb = PostEffects(res.rgb, p);
gl_FragColor = vec4(res.rgb, 1.0);
}
</script>
<script type="text/javascript">
var requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame || window.msRequestAnimationFrame ||
function(c) {window.setTimeout(c, 15)};
var config = {
camera: {
x: 0.0, y: 2.0, z: 0.0
},
lookat: {
x: -125.0, y: -85.0, z: -95.0
},
lightDir: {
x: -1.0, y: 0.8, z: -1.0
},
lightColour: {
r: 0.7, g: 0.8, b: 0.9
},
surface: {
specular: 6.0,
specularHardness: 512.0,
diffuse: 0.1,
attenDepth: -0.52,
attenScale: 0.2
},
global: {
fog: 0.02,
reflections: true,
postEffects: true,
moveCamera: true,
param: 0.2
}
};
var pause = false;
var stats = new Stats();
var aspect, gl;
function init()
{
document.addEventListener('keydown', function(e) {
switch (e.keyCode)
{
case 27: // ESC
pause = !pause;
break;
}
}, false);
// add GUI controls
var mobile = (navigator.userAgent.indexOf("Android") !== -1);
var gui = new dat.GUI();
var panel = gui.addFolder('Camera Position');
panel.add(config.camera, "x").min(-256).max(256).step(0.1);
panel.add(config.camera, "y").min(-100).max(100).step(0.1);
panel.add(config.camera, "z").min(-100).max(100).step(0.1);
//panel.open();
panel = gui.addFolder('Camera LookAt');
panel.add(config.lookat, "x").min(-256).max(256).step(0.1);
panel.add(config.lookat, "y").min(-100).max(100).step(0.1);
panel.add(config.lookat, "z").min(-100).max(100).step(0.1);
if (!mobile) panel.open();
panel = gui.addFolder('Light Direction');
panel.add(config.lightDir, "x").min(-10).max(10).step(0.1);
panel.add(config.lightDir, "y").min(-10).max(10).step(0.1);
panel.add(config.lightDir, "z").min(-10).max(10).step(0.1);
if (!mobile) panel.open();
panel = gui.addFolder('Light Colour');
panel.add(config.lightColour, "r").min(0).max(3).step(0.1);
panel.add(config.lightColour, "g").min(0).max(3).step(0.1);
panel.add(config.lightColour, "b").min(0).max(3).step(0.1);
//if (!mobile) panel.open();
panel = gui.addFolder('Surface');
panel.add(config.surface, "specular").min(0).max(64);
panel.add(config.surface, "specularHardness").min(16).max(1024).step(16);
panel.add(config.surface, "diffuse").min(0).max(1).step(0.05);
panel.add(config.surface, "attenDepth").min(-1.0).max(0.0).step(0.01);
panel.add(config.surface, "attenScale").min(0.05).max(1.0).step(0.01);
panel.open();
panel = gui.addFolder('Global');
panel.add(config.global, "fog").min(0).max(1).step(0.01);
panel.add(config.global, "reflections").name("Reflections");
panel.add(config.global, "postEffects").name("Post Effects");
panel.add(config.global, "moveCamera").name("Move Camera");
panel.add(config.global, "param").min(0.01).max(3.0).step(0.01);
if (!mobile) panel.open();
document.body.appendChild(stats.domElement);
// create webgl context on the canvas element
var canvas = document.getElementById("canvas");
aspect = canvas.width / canvas.height;
try
{
gl = canvas.getContext("experimental-webgl");
}
catch (e)
{
document.write("Whoops! No useful WEB-GL impl available. Shame on you and your browser vendor.<br>" + e.message);
return;
}
gl.viewport(0, 0, canvas.width, canvas.height);
gl.clearColor(0, 0, 0, 1);
gl.clear(gl.COLOR_BUFFER_BIT);
// get the vertex and fragment shader source
var v = document.getElementById("vertex").firstChild.nodeValue;
var f = document.getElementById("fragment").firstChild.nodeValue;
// compile and link the shaders
var vs = gl.createShader(gl.VERTEX_SHADER);
gl.shaderSource(vs, v);
gl.compileShader(vs);
var fs = gl.createShader(gl.FRAGMENT_SHADER);
gl.shaderSource(fs, f);
gl.compileShader(fs);
var program = gl.createProgram();
gl.attachShader(program, vs);
gl.attachShader(program, fs);
gl.linkProgram(program);
// debug shader compile status
var error = false;
if (!gl.getShaderParameter(vs, gl.COMPILE_STATUS))
{
error = true;
console.log(gl.getShaderInfoLog(vs));
}
if (!gl.getShaderParameter(fs, gl.COMPILE_STATUS))
{
error = true;
console.log(gl.getShaderInfoLog(fs));
}
if (!gl.getProgramParameter(program, gl.LINK_STATUS))
{
error = true;
console.log(gl.getProgramInfoLog(program));
}
if (error) return;
var firstTime = Date.now();
(f = function() {
if (!pause)
{
stats.begin();
// create vertices to fill the canvas with a single quad
var vertices = new Float32Array(
[
-1, 1*aspect, 1, 1*aspect, 1, -1*aspect,
-1, 1*aspect, 1, -1*aspect, -1, -1*aspect
]);
var vbuffer = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, vbuffer);
gl.bufferData(gl.ARRAY_BUFFER, vertices, gl.STATIC_DRAW);
var triCount = 2,
numItems = vertices.length / triCount;
gl.useProgram(program);
var time = (Date.now() - firstTime) / 1000.0;
program.time = gl.getUniformLocation(program, "time");
gl.uniform1f(program.time, time);
program.resolution = gl.getUniformLocation(program, "resolution");
gl.uniform2f(program.resolution, canvas.width, canvas.height);
program.cameraPos = gl.getUniformLocation(program, "cameraPos");
gl.uniform3f(program.cameraPos, config.camera.x, config.camera.y, config.camera.z);
program.cameraLookat = gl.getUniformLocation(program, "cameraLookat");
gl.uniform3f(program.cameraLookat, config.lookat.x, config.lookat.y, config.lookat.z);
program.lightDir = gl.getUniformLocation(program, "lightDir");
// pre normalise light dir
var x = config.lightDir.x, y = config.lightDir.y, z = config.lightDir.z;
var len = x*x + y*y + z*z;
len = 1.0 / Math.sqrt(len);
gl.uniform3f(program.lightDir, config.lightDir.x*len, config.lightDir.y*len, config.lightDir.z*len);
program.lightColour = gl.getUniformLocation(program, "lightColour");
gl.uniform3f(program.lightColour, config.lightColour.r, config.lightColour.g, config.lightColour.b);
program.specular = gl.getUniformLocation(program, "specular");
gl.uniform1f(program.specular, config.surface.specular);
program.specularHardness = gl.getUniformLocation(program, "specularHardness");
gl.uniform1f(program.specularHardness, config.surface.specularHardness);
program.diffuse = gl.getUniformLocation(program, "diffuse");
gl.uniform3f(program.diffuse, config.surface.diffuse,config.surface.diffuse,config.surface.diffuse);
program.moveCamera = gl.getUniformLocation(program, "moveCamera");
gl.uniform1f(program.moveCamera, config.global.moveCamera);
program.postEffects = gl.getUniformLocation(program, "postEffects");
gl.uniform1f(program.postEffects, config.global.postEffects);
program.reflections = gl.getUniformLocation(program, "reflections");
gl.uniform1f(program.reflections, config.global.reflections);
program.fog = gl.getUniformLocation(program, "fog");
gl.uniform1f(program.fog, config.global.fog);
program.attenDepth = gl.getUniformLocation(program, "attenDepth");
gl.uniform1f(program.attenDepth, config.surface.attenDepth);
program.attenScale = gl.getUniformLocation(program, "attenScale");
gl.uniform1f(program.attenScale, config.surface.attenScale);
program.param = gl.getUniformLocation(program, "param");
gl.uniform1f(program.param, config.global.param);
program.aVertexPosition = gl.getAttribLocation(program, "aVertexPosition");
gl.enableVertexAttribArray(program.aVertexPosition);
gl.vertexAttribPointer(program.aVertexPosition, triCount, gl.FLOAT, false, 0, 0);
gl.drawArrays(gl.TRIANGLES, 0, numItems);
stats.end();
//pause = true;
}
requestAnimationFrame(f);
})();
}
</script>
<link rel="stylesheet" href="../../reset.css">
<link rel="stylesheet" href="./page.css">
<link href='http://fonts.googleapis.com/css?family=Open+Sans:400,300,600' rel='stylesheet' type='text/css'>
</head>
<body onload="init()">
<canvas id="canvas" width="1024" height="680"></canvas>
<!--<canvas id="canvas" width="3840" height="2160"></canvas>-->
<a href="#" id="fullscreen">Toggle Full Screen</a>
<a href="." id="back">Show me more awesome demos!</a>
</body>
</html>