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shadowmap_wip_wip.html
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shadowmap_wip_wip.html
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset='UTF-8'/>
<title>WebGL shadows</title>
<!-- http://www.khronos.org/registry/gles/specs/2.0/es_full_spec_2.0.25.pdf -->
<style type="text/css">
body
{
background-color: #54A8FF;
}
.ui-frame
{
min-width: 75px;
text-align: center;
font-family: monospace;
color: white;
background-color: #542788;
border: 2px solid #FFFFFF;
opacity: 1.0;
border-radius: 5px;
padding: 5px;
}
#scene-frame
{
position: relative;
margin: auto;
width: 1280px;
height: 720px;
}
#scene-canvas
{
display: block;
cursor: move;
}
#fps-frame
{
position: absolute;
top: 5px;
left: 5px;
z-index: 2;
}
#settings-frame
{
margin-left: auto;
margin-right: auto;
width: 600px;
}
</style>
<script type="text/javascript" src="jquery.js"></script>
<!-- http://api.jquery.com/ -->
<script type="text/javascript" src="jquery.mousewheel.js"></script>
<!-- https://github.com/brandonaaron/jquery-mousewheel -->
<script type="text/javascript" src="gl-matrix.js"></script>
<!-- http://glmatrix.net/docs/2.2.0 -->
<script type="text/javascript">
var dash_vertices =
[
// x y u v
0.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 1.0,
1.0, 0.0, 1.0, 0.0,
1.0, 1.0, 1.0, 1.0
];
var plane_vertices =
[
// x y z u v nx ny nz
-5.0, -0.001, -5.0, 0.0, 0.0, 0.0, 1.0, 0.0,
-5.0, -0.001, 5.0, 0.0, 1.0, 0.0, 1.0, 0.0,
5.0, -0.001, -5.0, 1.0, 0.0, 0.0, 1.0, 0.0,
5.0, -0.001, 5.0, 1.0, 1.0, 0.0, 1.0, 0.0
];
var cube_vertices =
[
// x y z u v nx ny nz
-1, 1, 1, 0, 0, 0, 0, 1,
-1, -1, 1, 0, 1, 0, 0, 1,
1, 1, 1, 1, 0, 0, 0, 1,
1, -1, 1, 1, 1, 0, 0, 1,
1, 1, -1, 1, 0, 0, 0, -1,
1, -1, -1, 1, 1, 0, 0, -1,
-1, 1, -1, 0, 0, 0, 0, -1,
-1, -1, -1, 0, 1, 0, 0, -1,
-1, 1, -1, 1, 1, -1, 0, 0,
-1, -1, -1, 0, 1, -1, 0, 0,
-1, 1, 1, 1, 0, -1, 0, 0,
-1, -1, 1, 0, 0, -1, 0, 0,
1, 1, 1, 1, 0, 1, 0, 0,
1, -1, 1, 0, 0, 1, 0, 0,
1, 1, -1, 1, 1, 1, 0, 0,
1, -1, -1, 0, 1, 1, 0, 0,
-1, 1, 1, 0, 0, 0, 1, 0,
1, 1, 1, 1, 0, 0, 1, 0,
-1, 1, -1, 0, 1, 0, 1, 0,
1, 1, -1, 1, 1, 0, 1, 0,
1, -1, 1, 1, 0, 0, -1, 0,
-1, -1, 1, 0, 0, 0, -1, 0,
1, -1, -1, 1, 1, 0, -1, 0,
-1, -1, -1, 0, 1, 0, -1, 0
];
var cube_indices =
[
0, 1, 2,
2, 1, 3,
4, 5, 6,
6, 5, 7,
8, 9, 10,
10, 9, 11,
12, 13, 14,
14, 13, 15,
16, 17, 18,
18, 17, 19,
20, 21, 22,
22, 21, 23
];
</script>
<script id="shader-vs-caster" type="x-shader/x-vertex">
uniform mat4 matProj;
uniform mat4 matView;
uniform mat4 matWorld;
attribute vec3 aVertex;
varying vec2 vDepth;
void main(void)
{
gl_Position = matProj * matView * matWorld * vec4(aVertex, 1.0);
vDepth.xy = gl_Position.zw;
}
</script>
<script id="shader-fs-caster" type="x-shader/x-fragment">
precision mediump float;
varying vec2 vDepth;
vec4 pack(float depth)
{
vec4 bitShifts = vec4(256.0 * 256.0 * 256.0, 256.0 * 256.0, 256.0, 1.0);
vec4 bitMask = vec4(0, 1.0 / 256.0, 1.0 / 256.0, 1.0 / 256.0);
vec4 comp = fract(depth * bitShifts);
comp -= comp.xxyz * bitMask;
return comp;
}
void main(void)
{
gl_FragColor = pack((vDepth.x / vDepth.y) * 0.5 + 0.5);
}
</script>
<script id="shader-vs-receiver" type="x-shader/x-vertex">
uniform mat4 matLightProj;
uniform mat4 matLightView;
uniform mat4 matProj;
uniform mat4 matView;
uniform mat4 matWorld;
uniform vec3 uLight;
uniform vec3 uColour;
attribute vec3 aVertex;
attribute vec3 aNormal;
varying vec4 vShadowCoord;
varying vec3 vColour;
varying float cosTheta;
const mat4 matBias = mat4
(
0.5, 0.0, 0.0, 0.0,
0.0, 0.5, 0.0, 0.0,
0.0, 0.0, 0.5, 0.0,
0.5, 0.5, 0.5, 1.0
);
void main(void)
{
vec3 normal = (matWorld * vec4(aNormal, 0.0)).xyz;
cosTheta = dot(normalize(uLight), normalize(normal));
vColour = uColour;
vec4 vWorldVertex = matWorld * vec4(aVertex, 1.0);
gl_Position = matProj * matView * vWorldVertex;
vShadowCoord = matBias * matLightProj * matLightView * vWorldVertex;
}
</script>
<script id="shader-fs-receiver" type="x-shader/x-fragment">
precision mediump float;
uniform sampler2D uShadowSampler;
varying vec4 vShadowCoord;
varying vec3 vColour;
varying float cosTheta;
const vec2 size = vec2(512.0, 512.0);
float unpack(vec4 colour)
{
vec4 bitShifts = vec4(1.0 / ( 256.0 * 256.0 * 256.0), 1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0);
return dot(colour.xyzw, bitShifts);
}
float shadowCompare(vec2 uv, float compare)
{
float bias = 0.001;
float depth = unpack(texture2D(uShadowSampler, uv));
return step(depth, compare - bias); // (compare - bias < depth) ? 0 : 1
}
float shadowLerp(vec2 uv, float compare)
{
vec2 texelSize = vec2(1.0) / size;
vec2 f = fract(uv * size + 0.5); // fract = x - floor(x)
vec2 centroidUV = floor(uv * size + 0.5) / size;
float lb = shadowCompare(centroidUV + texelSize * vec2(0.0, 0.0), compare);
float lt = shadowCompare(centroidUV + texelSize * vec2(0.0, 1.0), compare);
float rb = shadowCompare(centroidUV + texelSize * vec2(1.0, 0.0), compare);
float rt = shadowCompare(centroidUV + texelSize * vec2(1.0, 1.0), compare);
float a = mix(lb, lt, f.y); // fy * lb + (1 - fy) * lt
float b = mix(rb, rt, f.y);
float c = mix(a, b, f.x);
return c;
}
float PCF(vec2 uv, float compare)
{
const float kernel_size = 9.0; // > 1 and % 2 = 1
float result = 0.0;
for (float x = -0.5 * (kernel_size - 1.0); x <= 0.5 * (kernel_size - 1.0); x += 1.0)
{
for (float y = -0.5 * (kernel_size - 1.0); y <= 0.5 * (kernel_size - 1.0); y += 1.0)
{
vec2 off = vec2(x, y) / size;
result += shadowCompare(uv + off, compare);
}
}
return result / (kernel_size * kernel_size);
}
float lerpPCF(vec2 uv, float compare)
{
const float kernel_size = 5.0; // > 1 and % 2 = 1
float result = 0.0;
for (float x = -0.5 * (kernel_size - 1.0); x <= 0.5 * (kernel_size - 1.0); x += 1.0)
{
for (float y = -0.5 * (kernel_size - 1.0); y <= 0.5 * (kernel_size - 1.0); y += 1.0)
{
vec2 off = vec2(x, y) / size;
result += shadowLerp(uv + off, compare);
}
}
return result / (kernel_size * kernel_size);
}
void main(void)
{
vec3 colour = vColour;
float pointDepth = vShadowCoord.z / vShadowCoord.w;
float shade = 0.0;
if (pointDepth < 1.0) // pixel inside light frustum
if (cosTheta > 0.25) // angled towards the light
{
// hard shadow
// shade = shadowCompare(vShadowCoord.xy, pointDepth);
// lerp
// shade = shadowLerp(vShadowCoord.xy, pointDepth);
// pcf
shade = PCF(vShadowCoord.xy, pointDepth);
// lerp pcf
// shade = lerpPCF(vShadowCoord.xy, pointDepth);
}
float light = max(cosTheta * (1.0 - shade), 0.33);
gl_FragColor = vec4(colour * light, 1.0);
}
</script>
<script id="shader-vs-dash" type="x-shader/x-vertex">
uniform mat3 matWorld;
uniform vec2 uResolution;
attribute vec2 aVertex;
attribute vec2 aTexCoord;
varying vec2 vTexCoord;
void main(void)
{
vTexCoord = aTexCoord;
vec2 worldVertex = (matWorld * vec3(aVertex, 1.0)).xy;
vec2 clipVertex = (worldVertex / uResolution) * 2.0 - 1.0;
gl_Position = vec4(clipVertex, 0.0, 1.0);
}
</script>
<script id="shader-fs-dash" type="x-shader/x-fragment">
precision mediump float;
uniform sampler2D uSampler;
varying vec2 vTexCoord;
float unpack(vec4 colour)
{
vec4 bitShifts = vec4(1.0 / ( 256.0 * 256.0 * 256.0), 1.0 / (256.0 * 256.0), 1.0 / 256.0, 1.0);
return dot(colour.xyzw, bitShifts);
}
void main(void)
{
float depth = unpack(texture2D(uSampler, vTexCoord));
gl_FragColor = vec4(depth, depth, depth, 1.0);
}
</script>
<script type="text/javascript">
"use strict";
var gl;
var casterShader, receiverShader, dashShader;
var torus_vertices, torus_indices;
var dashVertices, cubeVertices, cubeIndices, planeVertices, torusVertices, torusIndices;
var rttFramebuffer, rttColourTexture;
var SHADOWMAPSIZE = 512;
var showDash = false;
var dashsize;
var animateLight = false;
var mouseControl = false;
var mouseAngleX, mouseAngleY;
var mouseZoom = 0;
function getShader(source, type)
{
var shader;
switch (type)
{
case "x-shader/x-fragment":
shader = gl.createShader(gl.FRAGMENT_SHADER);
break;
case "x-shader/x-vertex":
shader = gl.createShader(gl.VERTEX_SHADER);
break;
default:
console.log(type);
return null;
}
gl.shaderSource(shader, source);
gl.compileShader(shader);
if (!gl.getShaderParameter(shader, gl.COMPILE_STATUS))
{
console.log(gl.getShaderInfoLog(shader));
return null;
}
return shader;
}
function createSolidTexture(r, g, b)
{
var data = new Uint8Array([r, g, b]);
var texture = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, 1, 1, 0, gl.RGB, gl.UNSIGNED_BYTE, data);
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.REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
gl.bindTexture(gl.TEXTURE_2D, null);
return texture;
}
function loadTexture(src, callback)
{
var texture = createSolidTexture(255, 255, 255);
var image = new Image();
image.crossOrigin = "anonymous";
image.addEventListener("load", function()
{
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, texture);
gl.pixelStorei(gl.UNPACK_FLIP_Y_WEBGL, true);
gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, image);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT);
gl.generateMipmap(gl.TEXTURE_2D);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR);
gl.bindTexture(gl.TEXTURE_2D, null);
if (callback)
{
callback(texture);
}
});
image.src = src;
return texture;
}
function generateTorus()
{
var outer_radius = 1.0;
var inner_radius = 0.5;
var num_rings = 32;
var num_segments = 32;
var num_vertices = (num_rings + 1) * (num_segments + 1);
var num_indices = num_vertices * 2 + 2;
torus_vertices = [];
var index = 0;
for (var i = 0; i <= num_rings; i++)
{
for (var j = 0; j <= num_segments; j++)
{
var u = i / num_rings;
var v = (j + u) / num_segments;
var u_angle = u * 2 * Math.PI;
var v_angle = v * 2 * Math.PI;
var x = Math.cos(u_angle) * (outer_radius + Math.cos(v_angle) * inner_radius);
var y = Math.sin(u_angle) * (outer_radius + Math.cos(v_angle) * inner_radius);
var z = Math.sin(v_angle) * inner_radius;
var nx = Math.cos(u_angle) * Math.cos(v_angle);
var ny = Math.sin(u_angle) * Math.cos(v_angle);
var nz = Math.sin(v_angle);
torus_vertices[index + 0] = x;
torus_vertices[index + 1] = y;
torus_vertices[index + 2] = z;
torus_vertices[index + 3] = u;
torus_vertices[index + 4] = v;
torus_vertices[index + 5] = nx;
torus_vertices[index + 6] = ny;
torus_vertices[index + 7] = nz;
index += 8;
}
}
torus_indices = [];
index = 0;
for (var i = 0; i <= num_vertices; i++)
{
torus_indices[index + 0] = i % num_vertices;
torus_indices[index + 1] = (i + num_segments + 1) % num_vertices;
index += 2;
}
}
function init()
{
dashsize = (gl.drawingBufferHeight < gl.drawingBufferWidth) ? 0.33 * gl.drawingBufferHeight : 0.33 * gl.drawingBufferWidth;
var vsCaster = getShader($("#shader-vs-caster").html(), $("#shader-vs-caster").attr("type"));
var psCaster = getShader($("#shader-fs-caster").html(), $("#shader-fs-caster").attr("type"));
casterShader = gl.createProgram();
gl.attachShader(casterShader, vsCaster);
gl.attachShader(casterShader, psCaster);
gl.linkProgram(casterShader);
if (!gl.getProgramParameter(casterShader, gl.LINK_STATUS))
{
console.log("Could not initialise caster shaders");
return false;
}
var vsReceiver = getShader($("#shader-vs-receiver").html(), $("#shader-vs-receiver").attr("type"));
var psReceiver = getShader($("#shader-fs-receiver").html(), $("#shader-fs-receiver").attr("type"));
receiverShader = gl.createProgram();
gl.attachShader(receiverShader, vsReceiver);
gl.attachShader(receiverShader, psReceiver);
gl.linkProgram(receiverShader);
if (!gl.getProgramParameter(receiverShader, gl.LINK_STATUS))
{
console.log("Could not initialise receiver shaders");
return false;
}
var vsDash = getShader($("#shader-vs-dash").html(), $("#shader-vs-dash").attr("type"));
var psDash = getShader($("#shader-fs-dash").html(), $("#shader-fs-dash").attr("type"));
dashShader = gl.createProgram();
gl.attachShader(dashShader, vsDash);
gl.attachShader(dashShader, psDash);
gl.linkProgram(dashShader);
if (!gl.getProgramParameter(dashShader, gl.LINK_STATUS))
{
console.log("Could not initialise dash shaders");
return false;
}
dashVertices = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, dashVertices);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(dash_vertices), gl.STATIC_DRAW);
cubeVertices = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(cube_vertices), gl.STATIC_DRAW);
cubeIndices = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndices);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(cube_indices), gl.STATIC_DRAW);
generateTorus();
torusVertices = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, torusVertices);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(torus_vertices), gl.STATIC_DRAW);
torusIndices = gl.createBuffer();
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, torusIndices);
gl.bufferData(gl.ELEMENT_ARRAY_BUFFER, new Uint16Array(torus_indices), gl.STATIC_DRAW);
planeVertices = gl.createBuffer();
gl.bindBuffer(gl.ARRAY_BUFFER, planeVertices);
gl.bufferData(gl.ARRAY_BUFFER, new Float32Array(plane_vertices), gl.STATIC_DRAW);
rttFramebuffer = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, rttFramebuffer);
rttFramebuffer.width = rttFramebuffer.height = SHADOWMAPSIZE;
rttColourTexture = gl.createTexture();
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
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.RGBA, rttFramebuffer.width, rttFramebuffer.height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);
var renderBuffer = gl.createRenderbuffer();
gl.bindRenderbuffer(gl.RENDERBUFFER, renderBuffer);
gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, rttFramebuffer.width, rttFramebuffer.height);
gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, rttColourTexture, 0);
gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, renderBuffer);
if (gl.checkFramebufferStatus(gl.FRAMEBUFFER) != gl.FRAMEBUFFER_COMPLETE)
{
console.log("Could not initialize shadow map: " + status);
return false;
}
gl.bindTexture(gl.TEXTURE_2D, null);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
return true;
}
var tick = (function(callback)
{
return window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame
|| window.oRequestAnimationFrame || window.msRequestAnimationFrame;
})();
function draw(timestamp)
{
var now = new Date().getTime();
if (draw.timeStamp == undefined)
draw.timeStamp = now;
draw.frameCount = (draw.frameCount == undefined) ? 0 : draw.frameCount + 1;
if (now - draw.timeStamp >= 1000)
{
$('#fps').text(draw.frameCount);
draw.frameCount = 0;
draw.timeStamp = now;
}
draw.boxAngle = (draw.boxAngle == undefined) ? 0 : draw.boxAngle + 1;
if (draw.boxAngle >= 360)
draw.boxAngle = 0;
draw.viewAngle = (draw.viewAngle == undefined) ? 0 : draw.viewAngle + 1;
if (draw.viewAngle >= 3600)
draw.viewAngle = 0;
if (draw.lightAngle == undefined)
draw.lightAngle = 0;
if (animateLight)
draw.lightAngle += 1;
if (draw.lightAngle >= 500)
draw.lightAngle = 0;
var eye = vec3.fromValues(Math.cos(2 * Math.PI / 500 * draw.lightAngle) * 5.0, 4.0, Math.sin(2 * Math.PI / 500 * draw.lightAngle) * 5.0);
var matLightProj = mat4.create();
var matLightView = mat4.create();
// render shadow map
{
gl.cullFace(gl.FRONT);
gl.bindFramebuffer(gl.FRAMEBUFFER, rttFramebuffer);
gl.viewport(0, 0, rttFramebuffer.width, rttFramebuffer.height);
gl.clearDepth(1.0);
gl.clearColor(1.0, 1.0, 1.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
mat4.ortho(matLightProj, -5, 5, -5, 5, 1.0, 15.0);
mat4.lookAt(matLightView, eye, [0.0, 0.0, 0.0], [0.0, 1.0, 0.0]);
var matWorld = mat4.create();
// torus
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [0, 2.0, 0]);
mat4.rotate(matWorld, matWorld, 2 * Math.PI / 360 * draw.boxAngle, [0.66, 0.0, 0.34]);
gl.useProgram(casterShader);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matWorld"), false, matWorld);
gl.enableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
gl.bindBuffer(gl.ARRAY_BUFFER, torusVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, torusIndices);
gl.vertexAttribPointer(gl.getAttribLocation(casterShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
gl.drawElements(gl.TRIANGLE_STRIP, torus_indices.length, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
}
// cube
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [2.0, 1.0, 2.0]);
mat4.rotate(matWorld, matWorld, 2 * Math.PI / 360 * 45, [0.0, 1.0, 0.0]);
mat4.scale(matWorld, matWorld, [0.75, 1.0, 0.25]);
gl.useProgram(casterShader);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matWorld"), false, matWorld);
gl.enableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndices);
gl.vertexAttribPointer(gl.getAttribLocation(casterShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
gl.drawElements(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
}
// cube
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [-2.0, 0.25, -2.0]);
mat4.scale(matWorld, matWorld, [1.0, 0.25, 1.0]);
gl.useProgram(casterShader);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(casterShader, "matWorld"), false, matWorld);
gl.enableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndices);
gl.vertexAttribPointer(gl.getAttribLocation(casterShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
gl.drawElements(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(casterShader, "aVertex"));
}
}
// render scene
{
gl.cullFace(gl.BACK);
gl.bindFramebuffer(gl.FRAMEBUFFER, null);
gl.viewport(0, 0, gl.drawingBufferWidth, gl.drawingBufferHeight);
gl.clearDepth(1.0);
gl.clearColor(0.33, 0.66, 1.0, 1.0);
gl.clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT);
var matProj = mat4.create();
mat4.perspective(matProj, 2 * Math.PI / 360 * 45, gl.drawingBufferWidth / gl.drawingBufferHeight, 1.0, 100.0);
var matView = mat4.create();
mat4.identity(matView);
if (mouseControl)
{
mat4.translate(matView, matView, [0, 0, -15.0 + mouseZoom]);
mat4.rotate(matView, matView, Math.PI * mouseAngleY / 4, [1.0, 0.0, 0.0]);
mat4.rotate(matView, matView, Math.PI * mouseAngleX, [0.0, 1.0, 0.0]);
}
else
{
mat4.translate(matView, matView, [0, 0, -15.0]);
mat4.rotate(matView, matView, 2 * Math.PI / 360 * 25, [1.0, 0.0, 0.0]);
mat4.rotate(matView, matView, 2 * Math.PI / 360 * 45, [0.0, 1.0, 0.0]);
mat4.rotate(matView, matView, 2 * Math.PI / 3600 * draw.viewAngle, [0.0, 1.0, 0.0]);
}
var matWorld = mat4.create();
// torus
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [0, 2.0, 0]);
mat4.rotate(matWorld, matWorld, 2 * Math.PI / 360 * draw.boxAngle, [0.66, 0.0, 0.34]);
gl.useProgram(receiverShader);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.uniform1i(gl.getUniformLocation(receiverShader, "uShadowSampler"), 0);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matProj"), false, matProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matView"), false, matView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matWorld"), false, matWorld);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uLight"), eye);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uColour"), [1.0, 0.43, 0.78]);
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.bindBuffer(gl.ARRAY_BUFFER, torusVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, torusIndices);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
//gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aTexCoord"), 2, gl.FLOAT, false, 32, 12);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aNormal"), 3, gl.FLOAT, false, 32, 20);
gl.drawElements(gl.TRIANGLE_STRIP, torus_indices.length, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, null);
}
// cube
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [2.0, 1.0, 2.0]);
mat4.rotate(matWorld, matWorld, 2 * Math.PI / 360 * 45, [0.0, 1.0, 0.0]);
mat4.scale(matWorld, matWorld, [0.75, 1.0, 0.25]);
gl.useProgram(receiverShader);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.uniform1i(gl.getUniformLocation(receiverShader, "uShadowSampler"), 0);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matProj"), false, matProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matView"), false, matView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matWorld"), false, matWorld);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uLight"), eye);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uColour"), [0.78, 1.0, 0.43]);
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndices);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
//gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aTexCoord"), 2, gl.FLOAT, false, 32, 12);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aNormal"), 3, gl.FLOAT, false, 32, 20);
gl.drawElements(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, null);
}
// cube
{
mat4.identity(matWorld);
mat4.translate(matWorld, matWorld, [-2.0, 0.25, -2.0]);
mat4.scale(matWorld, matWorld, [1.0, 0.25, 1.0]);
gl.useProgram(receiverShader);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.uniform1i(gl.getUniformLocation(receiverShader, "uShadowSampler"), 0);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matProj"), false, matProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matView"), false, matView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matWorld"), false, matWorld);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uLight"), eye);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uColour"), [0.43, 0.78, 1.0]);
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.bindBuffer(gl.ARRAY_BUFFER, cubeVertices);
gl.bindBuffer(gl.ELEMENT_ARRAY_BUFFER, cubeIndices);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
//gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aTexCoord"), 2, gl.FLOAT, false, 32, 12);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aNormal"), 3, gl.FLOAT, false, 32, 20);
gl.drawElements(gl.TRIANGLES, 36, gl.UNSIGNED_SHORT, 0);
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, null);
}
// plane
{
mat4.identity(matWorld);
gl.useProgram(receiverShader);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.uniform1i(gl.getUniformLocation(receiverShader, "uShadowSampler"), 0);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightProj"), false, matLightProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matLightView"), false, matLightView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matProj"), false, matProj);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matView"), false, matView);
gl.uniformMatrix4fv(gl.getUniformLocation(receiverShader, "matWorld"), false, matWorld);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uLight"), eye);
gl.uniform3fv(gl.getUniformLocation(receiverShader, "uColour"), [0.0, 0.5, 0.0]);
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.enableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.bindBuffer(gl.ARRAY_BUFFER, planeVertices);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aVertex"), 3, gl.FLOAT, false, 32, 0);
gl.vertexAttribPointer(gl.getAttribLocation(receiverShader, "aNormal"), 3, gl.FLOAT, false, 32, 20);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aVertex"));
gl.disableVertexAttribArray(gl.getAttribLocation(receiverShader, "aNormal"));
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, null);
}
// dash
if (showDash)
{
var matDash = mat3.create();
mat3.identity(matDash);
mat3.translate(matDash, matDash, [gl.drawingBufferWidth - dashsize, gl.drawingBufferHeight - dashsize]);
mat3.scale(matDash, matDash, [dashsize, dashsize]);
gl.disable(gl.DEPTH_TEST);
gl.disable(gl.CULL_FACE);
gl.useProgram(dashShader);
gl.activeTexture(gl.TEXTURE0);
gl.bindTexture(gl.TEXTURE_2D, rttColourTexture);
gl.uniform1i(gl.getUniformLocation(dashShader, "uSampler"), 0);
gl.uniformMatrix3fv(gl.getUniformLocation(dashShader, "matWorld"), false, matDash);
gl.uniform2fv(gl.getUniformLocation(dashShader, "uResolution"), [gl.drawingBufferWidth, gl.drawingBufferHeight]);
gl.enableVertexAttribArray(gl.getAttribLocation(dashShader, "aVertex"));
gl.enableVertexAttribArray(gl.getAttribLocation(dashShader, "aTexCoord"));
gl.bindBuffer(gl.ARRAY_BUFFER, dashVertices);
gl.vertexAttribPointer(gl.getAttribLocation(dashShader, "aVertex"), 2, gl.FLOAT, false, 16, 0);
gl.vertexAttribPointer(gl.getAttribLocation(dashShader, "aTexCoord"), 2, gl.FLOAT, false, 16, 8);
gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
gl.disableVertexAttribArray(gl.getAttribLocation(dashShader, "aVertex"));
gl.disableVertexAttribArray(gl.getAttribLocation(dashShader, "aTexCoord"));
gl.bindTexture(gl.TEXTURE_2D, null);
gl.enable(gl.DEPTH_TEST);
gl.enable(gl.CULL_FACE);
}
}
gl.flush();
tick(draw);
}
$(function()
{
$('#yesdash').click(function(event)
{
showDash = ($(this).is(':checked'));
});
$('#yeslight').click(function(event)
{
animateLight = ($(this).is(':checked'));
});
$('#yesmouse').click(function(event)
{
mouseControl = ($(this).is(':checked'));
});
$('#scene-canvas').click(function(event)
{
mouseControl = !mouseControl;
$('#yesmouse').attr('checked', mouseControl);
});
$('#scene-canvas').mousemove(function(event)
{
mouseAngleX = (event.pageX / $('#scene-canvas').width()) * 2 - 1;
mouseAngleY = (event.pageY / $('#scene-canvas').height()) * 2 - 1;
});
$('#scene-canvas').mousewheel(function(event)
{
mouseZoom += 0.25 * event.deltaY;
});
var canvas = $('#scene-canvas')[0];
canvas.width = $('#scene-frame').width();
canvas.height = $('#scene-frame').height();
var webgl_names = ["webgl", "experimental-webgl", "webkit-3d", "moz-webgl"];
for (var i = 0; i < webgl_names.length; i++)
{
try
{