JS-Raymarch/index.html at master · vygr/JS-Raymarch · GitHub

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<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta name="robots" content="all" />
<title>Raymarching</title>
<style type="text/css">
</style>

<script type="text/javascript">
"use strict";

window.onload = main;

var gl;

var start_time;
var snapshot_times = [];

var time_location;
var arg_aa_location;
var arg_aa_adaptive_location;
var arg_aa_debug_location;
var arg_aa_limit_location;
var arg_ao_location;
var arg_depth_location;
var arg_ref_location;
var arg_shadow_location;
var arg_bump_location;
var arg_dis_location;
var arg_march_location;

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;
}

function main()
{
    var canvas = document.getElementById("canvas");
    gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');
    if (!gl)
    {
        alert("OpenGL could not be initialized.");
        document.getElementById('heading').innerHTML = "WebGL - Initialization Error";
        document.getElementById('info').innerHTML = "WebGL could not be initialized. Check that your browser supports WebGL.";
        return;
    }

    gl.getExtension('OES_standard_derivatives');

    var vertex_shader = getShader(gl, "2d-vertex-shader");
    var fragment_shader = getShader(gl, "2d-fragment-shader");
    var program = gl.createProgram();
    gl.attachShader(program, vertex_shader);
    gl.attachShader(program, fragment_shader);
    gl.linkProgram(program);
    gl.deleteShader(vertex_shader);
    gl.deleteShader(fragment_shader);

    if (!gl.getProgramParameter(program, gl.LINK_STATUS))
    {
        document.getElementById('heading').innerHTML = "WebGL - Shader Initialization Error";
        document.getElementById('info').innerHTML = "WebGL could not initialize one, or both, shaders.";
        gl.deleteProgram(program);
        return;
    }

    gl.useProgram(program);

    time_location = gl.getUniformLocation(program, "time");
    var screen_ratio_location = gl.getUniformLocation(program, "screen_ratio");
    var position_location = gl.getAttribLocation(program, "position");
    var resolution_location = gl.getUniformLocation(program, "resolution");
    arg_aa_location = gl.getUniformLocation(program, "arg_aa");
    arg_aa_adaptive_location = gl.getUniformLocation(program, "arg_aa_adaptive");
    arg_aa_limit_location = gl.getUniformLocation(program, "arg_aa_limit");
    arg_aa_debug_location = gl.getUniformLocation(program, "arg_aa_debug");
	arg_ao_location = gl.getUniformLocation(program, "arg_ao");
	arg_depth_location = gl.getUniformLocation(program, "arg_depth");
	arg_ref_location = gl.getUniformLocation(program, "arg_ref");
	arg_shadow_location = gl.getUniformLocation(program, "arg_shadow");
	arg_bump_location = gl.getUniformLocation(program, "arg_bump");
	arg_dis_location = gl.getUniformLocation(program, "arg_dis");
	arg_march_location = gl.getUniformLocation(program, "arg_march");

    gl.uniform2f(resolution_location, canvas.width, canvas.height);
    var mx = Math.max(canvas.width, canvas.height);
    var xdivmx = canvas.width/mx;
    var ydivmx = canvas.height/mx;
    gl.uniform2f(screen_ratio_location, xdivmx, ydivmx);

    var buffer = gl.createBuffer();
    gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
    gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([
    -1.0, -1.0,
     1.0, -1.0,
    -1.0,  1.0,
    -1.0,  1.0,
     1.0, -1.0,
     1.0,  1.0]), gl.STATIC_DRAW);
    gl.enableVertexAttribArray(position_location);
    gl.vertexAttribPointer(position_location, 2, gl.FLOAT, false, 0, 0);

    document.getElementById('info').innerHTML = "<i>Frame Rate</i>: ...";
	start_time = Date.now();
    window.requestAnimationFrame(render, canvas);
}

window.requestAnimFrame = (function()
{
    return window.requestAnimationFrame ||
        window.webkitRequestAnimationFrame ||
        window.mozRequestAnimationFrame ||
        window.oRequestAnimationFrame ||
        window.msRequestAnimationFrame ||
        function(callback, element)
        {
            return window.setTimeout(callback, 1000/60);
        };
})();

window.cancelRequestAnimFrame = (function()
{
    return window.cancelCancelRequestAnimationFrame ||
        window.webkitCancelRequestAnimationFrame ||
        window.mozCancelRequestAnimationFrame ||
        window.oCancelRequestAnimationFrame ||
        window.msCancelRequestAnimationFrame ||
        window.clearTimeout;
})();

function render()
{
    gl.uniform1i(arg_aa_location, document.getElementById("arg_aa").checked);
    gl.uniform1i(arg_aa_adaptive_location, document.getElementById("arg_aa_adaptive").checked);
    gl.uniform1i(arg_aa_debug_location, document.getElementById("arg_aa_debug").checked);
    gl.uniform1f(arg_aa_limit_location, document.getElementById("arg_aa_limit").value);
    gl.uniform1f(arg_ao_location, document.getElementById("arg_ao").value);
	gl.uniform1i(arg_depth_location, document.getElementById("arg_depth").value);
	gl.uniform1f(arg_ref_location, document.getElementById("arg_ref").value);
	gl.uniform1f(arg_shadow_location, document.getElementById("arg_shadow").value);
	gl.uniform1f(arg_bump_location, document.getElementById("arg_bump").value);
	gl.uniform1f(arg_dis_location, document.getElementById("arg_dis").value);
	gl.uniform1f(arg_march_location, document.getElementById("arg_march").value);
    gl.uniform1f(time_location, (Date.now() - start_time)/1000.0);
//    gl.uniform1f(time_location, 10);
    gl.drawArrays(gl.TRIANGLES, 0, 6);

	snapshot_times.push(Date.now());
	if (snapshot_times.length > 10) snapshot_times.shift();
	var fps = ((snapshot_times.length-1)*1000)/(snapshot_times[snapshot_times.length-1] - snapshot_times[0]);
    document.getElementById('info').innerHTML = "<i>Frame Rate</i>: " + fps.toFixed(2) + " fps";
    window.requestAnimationFrame(render, canvas);
}
</script>

<script id="2d-vertex-shader" type="x-shader/x-vertex">
attribute vec2 position;
uniform vec2 screen_ratio;
varying vec2 surface_position;

void main()
{
    surface_position = position*screen_ratio;
    gl_Position = vec4(position, 0, 1);
}
</script>

<script id="2d-fragment-shader" type="x-shader/x-fragment">
#ifdef GL_ES
    precision highp float;
#endif

uniform float time;
uniform vec2 resolution;
uniform int arg_aa;
uniform int arg_aa_adaptive;
uniform int arg_aa_debug;
uniform int arg_depth;
uniform float arg_aa_limit;
uniform float arg_ao;
uniform float arg_ref;
uniform float arg_shadow;
uniform float arg_bump;
uniform float arg_dis;
uniform float arg_march;

#define PI 3.1415926535898

const float eps = 0.001;
const float min_distance = 0.005;
const float clipFar = 8.0;
const vec3 bgcolor = vec3(0.);

vec3 cam_pos = vec3(0., 0., time*0.1);
vec3 light_pos = vec3(cam_pos.x + 0.5*cos(time), cam_pos.y + 0.0*sin(time), cam_pos.z);

float hash(float n)
{
    return fract(sin(n)*43758.5453);
}

vec3 hash33(vec3 p)
{
    float n = sin(dot(p, vec3(7, 157, 113)));
    return fract(vec3(2097152, 262144, 32768)*n);
}

float noise(vec3 x)
{
    vec3 p = floor(x);
    vec3 f = fract(x);
    f = f*f*(3.0-2.0*f);
    float n = p.x*7.0 + p.y*57.0 + 111.0*p.z;
    return mix(mix(mix(hash(n+  0.0), hash(n+  7.0),f.x),
                   mix(hash(n+ 57.0), hash(n+ 64.0),f.x),f.y),
               mix(mix(hash(n+111.0), hash(n+118.0),f.x),
                   mix(hash(n+168.0), hash(n+175.0),f.x),f.y),f.z);
}

float sinusoidal_bump(vec3 p)
{
    return sin(p.x*4.+time*0.97)*cos(p.y*4.+time*2.17)*sin(p.z*4.-time*1.31)
	 	+ 0.5*sin(p.x*8.+time*0.57)*cos(p.y*8.+time*2.11)*sin(p.z*8.-time*1.23);
}

float bump(vec3 p)
{
     return noise(p*64.0)*0.667+noise(p*128.0)*0.333;
}

vec3 bumpmap(vec3 p, vec3 n, float bf)
{
    vec3 grad = vec3(bump(vec3(p.x+eps, p.y, p.z))-bump(vec3(p.x-eps, p.y, p.z)),
					bump(vec3(p.x, p.y+eps, p.z))-bump(vec3(p.x, p.y-eps, p.z)),
					bump(vec3(p.x, p.y, p.z+eps))-bump(vec3(p.x, p.y, p.z-eps)))/(eps+eps);
    grad -= n*dot(n, grad);
    return normalize(n-bf*grad);
}

//field equation for a sphere.
float sphere(vec3 p, vec3 center, float radius)
{
    return length(p-center) - radius;
}

//field equation for a cube.
float box(vec3 p, vec3 b)
{
	vec3 d = abs(p) - b;
	return min(max(d.x,max(d.y,d.z)),0.0) + length(max(d,0.0));
}

//field equation for a rounded cube.
float rounded_cube(vec3 p, vec3 xt, float r)
{
	return length(max(abs(p)-xt + vec3(r), 0.0)) - r;
}

//smooth min between two values
float smin(float a, float b, float k)
{
    float h = clamp(0.5+0.5*(b-a)/k, 0.0, 1.0);
    return mix(b, a, h) - k*h*(1.0-h);
}

//the scene
float scene(vec3 p)
{
	float d = 0.0;
	if (arg_dis > 0.0) d = sinusoidal_bump(p*4.0)*arg_dis;
	p = fract(p)-0.5;
    return sphere(p, vec3(0.0), 0.35) + d;
//    return smin(box(p, vec3(0.25,0.25,0.25)),
//                sphere(p, vec3(0.,0.,0.), 0.35),
//                0.025);
//    return max(box(p, vec3(0.25,0.25,0.25)),
//                sphere(p, vec3(0.,0.,0.), 0.35));
//    return min(box(p, vec3(0.25,0.25,0.25)),
//                sphere(p, vec3(0.,0.,0.), 0.35));
//    return max(-box(p, vec3(0.25,0.25,0.25)),
//                sphere(p, vec3(0.,0.,0.), 0.35));
}

vec3 get_normal(vec3 p)
{
	return normalize(vec3(
		scene(vec3(p.x+eps,p.y,p.z))-scene(vec3(p.x-eps,p.y,p.z)),
		scene(vec3(p.x,p.y+eps,p.z))-scene(vec3(p.x,p.y-eps,p.z)),
		scene(vec3(p.x,p.y,p.z+eps))-scene(vec3(p.x,p.y,p.z-eps))
	));
}

float calc_ao(vec3 p, vec3 n)
{
    const float AO_SAMPLES = 5.0;
    float r = 0.0;
    float w = 1.0;
    for (float i=1.0; i<=AO_SAMPLES; i++)
    {
        float d0 = i*0.2;
        r += w*(d0 - scene(p + n*d0));
        w *= 0.5;
    }
    return 1.0-clamp(r,0.0,1.0);
}

float calc_shadow(vec3 ro, vec3 rd, float l, float end, float k)
{
    float shade = 1.0;
    for (int i = 0; i < 1000; i++)
    {
        float h = scene(ro + rd*l);
        shade = min(shade, k*h/l);
        if (shade <= 0.1 || l >= end) break;
		l += h;
    }
    return max(shade, 0.1);
}

vec3 lighting(vec3 sp, vec3 sn, vec3 cp)
{
	vec3 obj_color = floor(mod(sp, 2.0));

    vec3 lp = light_pos;
    vec3 ld = lp-sp;
    vec3 lcolor = vec3(1.0,1.0,1.0);

    float len = length(ld);
    ld /= len;
    float lightAtten = min(1.0 / (0.25*len*len), 1.0);

    vec3 ref = reflect(-ld, sn);
	float ss = calc_shadow(sp, ld, min_distance, len, arg_shadow);

    float ao = 1.0-arg_ao;
	if (ao < 1.0) ao = ao + (1.0-ao)*calc_ao(sp, sn);

    float ambient = 0.05;
    float specularPower = 8.0;
    float diffuse = max(0.0, dot(sn, ld));
    float specular = max(0.0, dot(ref, normalize(cp-sp)));
    specular = pow(specular, specularPower);
    return (obj_color*(diffuse*0.8+ambient)+specular*0.5)*lcolor*lightAtten*ss*ao;
}

vec2 ray_march(vec3 ro, vec3 rd, float l, float end)
{
    float d, cnt;
    for (float i = 1.0; i < 1000.0; i++)
    {
		d = scene(ro + rd*l);
        l += d*arg_march;
		cnt = i;
		if ((d <= min_distance) || (l >= end)) break;
	}
	if (d > min_distance)
	{
		l = end;
		cnt = 0.0;
	}
	return vec2(l, cnt);
}

vec4 scene_ray(vec3 ro, vec3 rd)
{
    vec2 p_ray = ray_march(ro, rd, 0.0, clipFar);
	if (p_ray.x >= clipFar) return vec4(bgcolor, p_ray.y);
	vec3 sp = ro + rd*p_ray.x;
	vec3 sn = get_normal(sp);
	vec3 bn = sn;
	if (arg_bump > 0.0) bn = bumpmap(sp, sn, arg_bump);
	vec3 color = lighting(sp, bn, ro);
	float ref = arg_ref;
	for (int i = 1; i < 3; i++)
	{
		if (i > arg_depth) break;
		ro = sp;
		rd = reflect(rd, bn);
        vec2 r_ray = ray_march(ro, rd, min_distance*5.0, clipFar);
        p_ray.y = max(p_ray.y, r_ray.y);
		if (r_ray.x >= clipFar)
		{
			color += bgcolor*ref;
			break;
		}
		sp = ro + rd*r_ray.x;
		bn = get_normal(sp);
		color += lighting(sp, bn, ro)*ref;
		ref *= arg_ref;
	}
    return vec4(clamp(color, 0.0, 1.0), p_ray.y);
}

void main(void)
{
	const float FOV = 0.5;
    vec2 aspect = vec2(resolution.x/resolution.y, 1.0);
	vec3 lookat = vec3(0., 0., 0.);
    vec3 forward = normalize(lookat-cam_pos);
    vec3 right = normalize(vec3(forward.z, 0., -forward.x));
    vec3 up = normalize(cross(forward,right));

	vec2 screen_cords = (2.0*gl_FragCoord.xy/resolution.xy - 1.0)*aspect;
    vec3 rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
	vec4 color = scene_ray(cam_pos, rd);
	float scale = 1.0;
	if (arg_aa != 0)
	{
        if (arg_aa_adaptive != 0)
        {
            if (color.w > arg_aa_limit)
            {
				scale = 0.25;
	    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.5, 0.0))/resolution.xy - 1.0)*aspect;
	    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
	    		color += scene_ray(cam_pos, rd);
	    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.0, 0.5))/resolution.xy - 1.0)*aspect;
	    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
	    		color += scene_ray(cam_pos, rd);
	    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.5, 0.5))/resolution.xy - 1.0)*aspect;
	    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
	    		color += scene_ray(cam_pos, rd);
                if (arg_aa_debug != 0) color += vec4(2.0);
            }
        }
        else
        {
            scale = 0.25;
    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.5, 0.0))/resolution.xy - 1.0)*aspect;
    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
    		color += scene_ray(cam_pos, rd);
    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.0, 0.5))/resolution.xy - 1.0)*aspect;
    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
    		color += scene_ray(cam_pos, rd);
    		screen_cords = (2.0*(gl_FragCoord.xy+vec2(0.5, 0.5))/resolution.xy - 1.0)*aspect;
    	    rd = normalize(forward + FOV*screen_cords.x*right + FOV*screen_cords.y*up);
    		color += scene_ray(cam_pos, rd);
        }
	}
    color *= scale;
    color.w = 1.0;
	gl_FragColor = color;
}
</script>
</head>
<body>
	<div style="width:100%;">
		<div style="float:left; width:25%;">
			<table style="width:100%">
			  <tr>
			    <td><input id="arg_aa" type="checkbox">Anti Alias<br></td>
                <td><input id="arg_aa_adaptive" type="checkbox">Adaptive Mode<br></td>
			  </tr>
              <tr>
			    <td><input id="arg_aa_debug" type="checkbox">Anti Alias Debug<br></td>
                <td></td>
			  </tr>
              <tr>
			    <td><input id="arg_aa_limit_num" type="number" min="0" max="32" step="1" value ="16" oninput="arg_aa_limit.value=value"/></td>
				<td><input id="arg_aa_limit" type="range" min="0" max="32" step="1" value ="16" oninput="arg_aa_limit_num.value=value"/>Adaptive Limit<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_depth_num" type="number" min="0" max="2" step="1" value ="1" oninput="arg_depth.value=value"/></td>
				<td><input id="arg_depth" type="range" min="0" max="2" step="1" value ="1" oninput="arg_depth_num.value=value"/>Reflection Depth<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_ref_num" type="number" min="0" max="1" step="0.01" value ="0.3" oninput="arg_ref.value=value"/></td>
				<td><input id="arg_ref" type="range" min="0" max="1" step="0.01" value ="0.3" oninput="arg_ref_num.value=value"/>Reflection Coef<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_ao_num" type="number" min="0" max="1" step="0.01" value ="0.2" oninput="arg_ao.value=value"/></td>
				<td><input id="arg_ao" type="range" min="0" max="1" step="0.01" value ="0.2" oninput="arg_ao_num.value=value"/>Ambient Oclusion<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_shadow_num" type="number" min="32" max="256" step="0.01" value ="32" oninput="arg_shadow.value=value"/></td>
				<td><input id="arg_shadow" type="range" min="32" max="256" step="0.01" value ="32" oninput="arg_shadow_num.value=value"/>Shadow Softness<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_bump_num" type="number" min="0" max="0.01" step="0.0001" value ="0" oninput="arg_bump.value=value"/></td>
				<td><input id="arg_bump" type="range" min="0" max="0.01" step="0.0001" value ="0" oninput="arg_bump_num.value=value"/>Bump Factor<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_dis_num" type="number" min="0" max="0.03" step="0.0001" value ="0" oninput="arg_dis.value=value"/></td>
				<td><input id="arg_dis" type="range" min="0" max="0.03" step="0.0001" value ="0" oninput="arg_dis_num.value=value"/>Displace Factor<br></td>
			  </tr>
			  <tr>
			    <td><input id="arg_march_num" type="number" min="0.25" max="1.0" step="0.0001" value ="0.75" oninput="arg_march.value=value"/></td>
				<td><input id="arg_march" type="range" min="0.25" max="1.0" step="0.0001" value ="0.75" oninput="arg_march_num.value=value"/>March Scale<br></td>
			  </tr>
			</table>
		</div>
        <div style="float:left; width:75%;">
			<h1 id="heading">Raymarching Test</h1>
	        <canvas id="canvas" width="1024" height="768"></canvas>
	        <div id="info"></div>
		</div>
	</div>
</body>
</html>