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<!-- @@REWRITE(insert html-copyright) -->
<!--
O3D Siteswap animator
@@REWRITE(delete-start)
Author: Eric Uhrhane (ericu@google.com)
@@REWRITE(delete-end)
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>
Site Swap Simulator
</title>
<style type="text/css">
html, body {
height: 100%;
margin: 0;
padding: 0;
border: none;
}
</style>
<!-- Our javascript code -->
<script type="text/javascript" src="../o3djs/base.js"></script>
<script type="text/javascript" src="siteswap.js"></script>
<script type="text/javascript" src="math.js"></script>
<script type="text/javascript" src="animation.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.require('o3djs.util');
// Set up the client area.
function init() {
o3djs.util.setMainEngine(o3djs.util.Engine.V8);
o3djs.util.addScriptUri(''); // Allow V8 to load scripts in the cwd.
o3djs.util.makeClients(initStep2);
setUpSelection();
}
// Select the entire input pattern, so that the user can just type.
function setUpSelection() {
var input_pattern = document.getElementById('input_pattern');
input_pattern.focus();
input_pattern.selectionStart = 0;
input_pattern.selectionEnd = input_pattern.value.length;
}
/*
* Wrappers to enable button presses to call through to the embedded V8 engine.
*/
// Update whether we're animating or frozen based on the value of the checkbox.
function updateAnimatingWrapper() {
g.o3dElement.eval('updateAnimating()');
}
// Compute a new pattern.
function onComputePatternWrapper() {
g.o3dElement.eval('onComputePattern()');
}
// Adjust the view matrix to the new proportions of the plugin window.
// TODO: Switch to using the resize event once that's checked in.
function onResizeWrapper() {
g.o3dElement.eval('onResize()');
}
window.onresize = onResizeWrapper;
// Clean up all our callbacks, etc.
function cleanupWrapper() {
if (g && g.o3dElement) {
g.o3dElement.eval('cleanup()');
}
}
// The point of this function is to suppress form submit; we want to use the
// pattern entered when the user hits return, not submit the page to the
// webserver.
function suppressSubmit(event) {
onComputePatternWrapper(); // TODO: This suppresses form autocomplete storage.
return false;
}
</script>
</head>
<body onload="init()" onunload="cleanupWrapper()">
<table width="100%" style="height:100%;">
<tr>
<td>
<h1>Juggler</h1>
This sample displays a site-swap juggling pattern with animation done by
a vertex shader.
<form name="the_form" onsubmit="return suppressSubmit(event)">
<table>
<tr>
<td>
<table>
<tr>
<td>
<input
type="radio"
name="radio_group_hands"
value="1"
onclick=onComputePatternWrapper()>
1 Hand<br>
<input
type="radio"
name="radio_group_hands"
value="2"
onclick=onComputePatternWrapper()
checked>
2 Hands<br>
<input
type="radio"
name="radio_group_hands"
value="3"
onclick=onComputePatternWrapper()>
3 Hands<br>
<input
type="radio"
name="radio_group_hands"
value="4"
onclick=onComputePatternWrapper()>
4 Hands<br>
</td>
<td>
<input type="text" name="input_pattern" id="input_pattern"
value="3 4 5">
</td>
<td>
<input type="checkbox" name="check_box" checked
onclick=updateAnimatingWrapper()>Animate
<input
type="checkbox"
name="pair_hands"
onclick=onComputePatternWrapper();
>Pair Hands
</td>
<td>
<input type="button" name="computePattern"
value="Compute Pattern"
onclick=onComputePatternWrapper()>
</td>
</tr>
</table>
</td>
<td>
</td>
</tr>
</table>
</form>
<table id="container" width="90%" style="height:70%;">
<tr>
<td height="100%">
<!-- Start of g.o3d plugin -->
<div id="o3d" style="width: 100%; height: 100%;"></div>
<!-- End of g.o3d plugin -->
</td>
</tr>
</table>
<!-- a simple way to get a multiline string -->
<textarea id="shader" name="shader" cols="80" rows="20"
style="display: none;">
// the 4x4 world view projection matrix
float4x4 worldViewProjection : WorldViewProjection;
// positions of the light and camera
float3 light_pos;
float3 camera_pos;
// phong lighting properties of the material
float4 light_ambient;
float4 light_diffuse;
float4 light_specular;
// shininess of the material (for specular lighting)
float shininess;
// time for animation
float time;
// coefficients for a t^2 + b t + c for each of x, y, z
float3 coeff_a;
float3 coeff_b;
float3 coeff_c;
// flag and coefficient for optional LERP with rate t * coeff_lerp;
float coeff_lerp;
// coefficients for a t^2 + b t + c for each of x, y, z, for optional LERP
float3 coeff_l_a;
float3 coeff_l_b;
float3 coeff_l_c;
// coefficients for d sin(f t) + e cos(e t) for each of x, y, z
float3 coeff_d;
float3 coeff_e;
float3 coeff_f;
// to be subtracted from time to get the t for the above equation
float time_base;
// input parameters for our vertex shader
struct VertexShaderInput {
float4 position : POSITION;
float3 normal : NORMAL;
float4 color : COLOR;
};
// input parameters for our pixel shader
// also the output parameters for our vertex shader
struct PixelShaderInput {
float4 position : POSITION;
float3 lightVector : TEXCOORD0;
float3 normal : TEXCOORD1;
float3 viewPosition : TEXCOORD2;
float4 color : COLOR;
};
/**
* Vertex Shader - vertex shader for phong illumination
*/
PixelShaderInput vertexShaderFunction(VertexShaderInput input) {
/**
* We use the standard phong illumination equation here.
* We restrict (clamp) the dot products so that we
* don't get any negative values.
* All vectors are normalized for proper calculations.
*
* The output color is the summation of the
* ambient, diffuse, and specular contributions.
*
* Note that we have to transform each vertex and normal
* by the world view projection matrix first.
*/
PixelShaderInput output;
float t = time - time_base;
float3 offset = float3(0, 0, 0);
offset += t * t * coeff_a + t * coeff_b + coeff_c;
offset += coeff_d * sin(t * coeff_f);
offset += coeff_e * cos(t * coeff_f);
float3 lerpOffset = t * t * coeff_l_a + t * coeff_l_b + coeff_l_c;
if (coeff_lerp > 0) {
float rate = min(coeff_lerp * t, 1);
float3 lerpVector = float3(rate, rate, rate);
offset = lerp(offset, lerpOffset, lerpVector);
} else if (coeff_lerp < 0) {
float rate = min(-coeff_lerp * t, 1);
float3 lerpVector = float3(rate, rate, rate);
offset = lerp(lerpOffset, offset, lerpVector);
}
input.position = input.position + float4(offset.xyz, 0);
output.position = mul(input.position, worldViewProjection);
/**
* lightVector - light vector
* normal - normal vector
* viewPosition - view vector (from camera)
*/
// NOTE: In this case we do not need to multiply by any matrices since the
// WORLD transformation matrix is the identity. If you were moving the
// object such that the WORLD transform matrix was not the identity, you
// would need to multiply the normal by the WORLDINVERSETTRANSFORM matrix
// since the normal is in object space. Other values (light_pos, camera_pos)
// are already in world space.
float3 lightVector = light_pos - input.position.xyz;
float3 normal = input.normal;
float3 viewPosition = camera_pos - input.position.xyz;
output.lightVector = lightVector;
output.normal = normal;
output.viewPosition = viewPosition;
output.color = input.color;
return output;
}
/**
* Pixel Shader
*/
float4 pixelShaderFunction(PixelShaderInput input): COLOR {
float3 lightVector = normalize(input.lightVector);
float3 normal = normalize(input.normal);
float3 viewPosition = normalize(input.viewPosition);
float3 halfVector = normalize(lightVector + viewPosition);
// use lit function to calculate phong shading
// x component contains the ambient coefficient
// y component contains the diffuse coefficient:
// max(dot(normal, lightVector),0)
// z component contains the specular coefficient:
// dot(normal, lightVector) < 0 || dot(normal, halfVector) < 0 ?
// 0 : pow(dot(normal, halfVector), shininess)
// NOTE: This is actually Blinn-Phong shading, not Phong shading
// which would use the reflection vector instead of the half vector
float4 phong_coeff = lit(dot(normal, lightVector),
dot(normal, halfVector), shininess);
float4 ambient = light_ambient * phong_coeff.x * input.color;
float4 diffuse = light_diffuse * phong_coeff.y * input.color;
float4 specular = light_specular * phong_coeff.z * input.color;
return ambient + diffuse + specular;
}
// Here we tell our effect file *which* functions are
// our vertex and pixel shaders.
// #o3d VertexShaderEntryPoint vertexShaderFunction
// #o3d PixelShaderEntryPoint pixelShaderFunction
// #o3d MatrixLoadOrder RowMajor
</textarea>
</td>
</tr>
</table>
</body>
</html>
|
