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convolution.html
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convolution.html
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<!--
Copyright 2009, Google Inc.
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 Google Inc. 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.
-->
<!--
This sample shows how to create a separable convolution shader using
render targets. The kernel here is a Gaussian blur, but the same code
could be used for any kernel.
-->
<!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>
O3D: Convolution Shader Sample
</title>
<!-- Include sample javascript library functions-->
<script type="text/javascript" src="../o3d-webgl/base.js"></script>
<script type="text/javascript" src="../o3djs/base.js"></script>
<script type="text/javascript" id="o3dscript">
o3djs.base.o3d = o3d;
o3djs.require('o3djs.webgl');
o3djs.require('o3djs.util');
o3djs.require('o3djs.math');
o3djs.require('o3djs.camera');
o3djs.require('o3djs.rendergraph');
o3djs.require('o3djs.pack');
o3djs.require('o3djs.primitives');
o3djs.require('o3djs.scene');
// Events
// init() once the page has finished loading.
window.onload = init;
window.onunload = uninit;
// constants.
var RENDER_TARGET_WIDTH = 512;
var RENDER_TARGET_HEIGHT = 512;
// global variables
var g_o3d;
var g_client;
var g_math;
var g_pack;
var g_teapotRoot;
var g_renderGraphRoot;
var g_clock = 0;
var g_timeMult = 1;
var g_finished = false; // for selenium testing.
/**
* Loads a scene into the transform graph.
* @param {!o3d.Pack} pack Pack to load scene into.
* @param {string} fileName filename of the scene.
* @param {!o3d.Transform} parent parent node in the transform graph to
* which to load the scene into.
* @param {!o3djs.rendergraph.ViewInfo} viewInfo whose view and projection will
* be set from the scene after it's loaded.
*/
function loadScene(pack, fileName, parent, viewInfo) {
// Get our full path to the scene.
var scenePath = o3djs.util.getCurrentURI() + fileName;
// Load the scene given the full path, and call the callback function
// when its done loading.
o3djs.scene.loadScene(g_client, pack, parent, scenePath, callback);
/**
* Our callback is called once the scene has been loaded into memory from the
* web or locally.
* @param {!o3d.Pack} pack The pack that was passed in above.
* @param {!o3d.Transform} parent The parent that was passed in above.
* @param {*} exception null if loading succeeded.
*/
function callback(pack, parent, exception) {
if (exception) {
alert('Could not load: ' + fileName + '\n' + exception);
return;
}
// Get a CameraInfo (an object with a view and projection matrix)
// using our javascript library function
var cameraInfo = o3djs.camera.getViewAndProjectionFromCameras(
parent,
RENDER_TARGET_WIDTH,
RENDER_TARGET_HEIGHT);
// Copy the view and projection to the passed in viewInfo structure..
viewInfo.drawContext.view = cameraInfo.view;
viewInfo.drawContext.projection = cameraInfo.projection;
// Generate draw elements and setup material draw lists.
o3djs.pack.preparePack(pack, viewInfo);
g_finished = true; // for selenium testing.
}
}
/**
* Creates the client area.
*/
function init() {
o3djs.webgl.makeClients(initStep2);
}
/**
* Initializes O3D and loads the scene into the transform graph.
* @param {Array} clientElements Array of o3d object elements.
*/
function initStep2(clientElements) {
// Initializes global variables and libraries.
var o3d = clientElements[0];
g_o3d = o3d.o3d;
g_math = o3djs.math;
g_client = o3d.client;
// Creates a pack to manage our resources/assets.
g_pack = g_client.createPack();
// Create the texture required for the color render-target.
var texture1 = g_pack.createTexture2D(RENDER_TARGET_WIDTH,
RENDER_TARGET_HEIGHT,
g_o3d.Texture.XRGB8, 1, true);
// Create the texture required for the color render-target.
var texture2 = g_pack.createTexture2D(RENDER_TARGET_WIDTH,
RENDER_TARGET_HEIGHT,
g_o3d.Texture.XRGB8, 1, true);
g_teapotRoot = g_pack.createObject('Transform');
var renderGraphRoot = g_client.renderGraphRoot;
var xSigma = 4.0, ySigma = 4.0;
var xKernel = buildKernel(xSigma);
var yKernel = buildKernel(ySigma);
var renderSurfaceSet1 = createRenderSurfaceSet(texture1);
var renderSurfaceSet2 = createRenderSurfaceSet(texture2);
// Create the render graph for the teapot view, drawing the teapot into
// texture1 (via renderSurfaceSet1).
var teapotViewInfo = o3djs.rendergraph.createBasicView(
g_pack,
g_teapotRoot,
renderSurfaceSet1,
[1, 1, 1, 1]);
// Create a Y convolution pass that convolves texture1 into texture2, using
// the X kernel.
var renderNode1 = createConvolutionPass(texture1,
renderSurfaceSet2,
xKernel,
1.0 / texture1.width,
0.0);
// Create a Y convolution pass that convolves texture2 into the framebuffer,
// using the Y kernel.
var renderNode2 = createConvolutionPass(texture2,
g_client.renderGraphRoot,
yKernel,
0.0,
1.0 / texture2.height);
// Load the scene into the transform graph as a child g_teapotRoot
loadScene(g_pack, '../assets/teapot/scene.json', g_teapotRoot,
teapotViewInfo);
// Set a render callback.
g_client.setRenderCallback(onRender);
}
// We lop off the sqrt(2 * pi) * sigma term, since we're going to normalize
// anyway.
function gauss(x, sigma) {
return Math.exp(- (x * x) / (2.0 * sigma * sigma));
}
function buildKernel(sigma) {
var kMaxKernelSize = 25;
var kernelSize = 2 * Math.ceil(sigma * 3.0) + 1;
if (kernelSize > kMaxKernelSize) {
kernelSize = kMaxKernelSize;
}
var halfWidth = (kernelSize - 1) * 0.5
var values = new Array(kernelSize);
var sum = 0.0;
for (var i = 0; i < kernelSize; ++i) {
values[i] = gauss(i - halfWidth, sigma);
sum += values[i];
}
// Now normalize the kernel.
for (var i = 0; i < kernelSize; ++i) {
values[i] /= sum;
}
return values;
}
function createConvolutionMaterial(viewInfo, kernelSize) {
var convFXString = document.getElementById('convFX').value;
convFXString = convFXString.replace(/KERNEL_WIDTH/g, kernelSize);
var convEffect = g_pack.createObject('Effect');
convEffect.loadFromFXString(convFXString);
var convMaterial = g_pack.createObject('Material');
convMaterial.drawList = viewInfo.performanceDrawList;
convMaterial.effect = convEffect;
convEffect.createUniformParameters(convMaterial);
return convMaterial;
}
function createRenderSurfaceSet(texture) {
var renderSurface = texture.getRenderSurface(0);
// Create the depth-stencil buffer required when rendering this pass.
var depthSurface = g_pack.createDepthStencilSurface(RENDER_TARGET_WIDTH,
RENDER_TARGET_HEIGHT);
var renderSurfaceSet = g_pack.createObject('RenderSurfaceSet');
renderSurfaceSet.renderSurface = renderSurface;
renderSurfaceSet.renderDepthStencilSurface = depthSurface;
renderSurfaceSet.parent = g_client.renderGraphRoot;
return renderSurfaceSet;
}
function createConvolutionPass(srcTexture, renderGraphRoot, kernel, x, y) {
// Create a root Transform for the convolution scene.
var root = g_pack.createObject('Transform');
// Create a basic view for the convolution scene.
var viewInfo = o3djs.rendergraph.createBasicView(
g_pack,
root,
renderGraphRoot,
[1, 1, 1, 1]);
var material = createConvolutionMaterial(viewInfo, kernel.length);
var quadShape = o3djs.primitives.createPlane(g_pack,
material,
2.0,
2.0,
1,
1);
// Attach the quad to the root of the convolution graph.
root.addShape(quadShape);
// Rotate the view so we're looking at the XZ plane (where our quad is)
// Point the camera along the -Y axis
var target = [0, -1, 0];
// Put the camera at the origin.
var eye = [0, 0, 0];
// Define the up-vector as +Z
var up = [0, 0, 1];
viewInfo.drawContext.view = g_math.matrix4.lookAt(eye, target, up);
// Create an orthographic projection.
viewInfo.drawContext.projection =
g_math.matrix4.orthographic(-1, 1, -1, 1, -1, 1);
// Generate draw elements and setup material draw lists for the
// convolution scene.
o3djs.pack.preparePack(g_pack, viewInfo);
setConvolutionParameters(material, srcTexture, kernel, kernel.length, x, y);
return renderGraphRoot;
}
function setConvolutionParameters(material, texture, kernel, kernelSize,
xIncrement, yIncrement) {
var imageParam = material.getParam('image');
var kernelParam = material.getParam('kernel');
var imageIncrement = material.getParam('imageIncrement');
var sampler = g_pack.createObject('Sampler');
sampler.texture = texture;
sampler.addressModeU = g_o3d.Sampler.CLAMP;
sampler.addressModeV = g_o3d.Sampler.CLAMP;
sampler.minFilter = g_o3d.Sampler.POINT;
sampler.magFilter = g_o3d.Sampler.POINT;
sampler.mipFilter = g_o3d.Sampler.NONE;
imageParam.value = sampler;
imageIncrement.value = [xIncrement, yIncrement];
var paramArray = g_pack.createObject('ParamArray');
var halfWidth = (kernelSize - 1) * 0.5;
for (var i = 0; i < kernelSize; ++i) {
var element = paramArray.createParam(i, 'ParamFloat');
element.value = kernel[i];
}
kernelParam.value = paramArray;
}
/**
* Called every frame.
* @param {o3d.RenderEvent} renderEvent Rendering Information.
*/
function onRender(renderEvent) {
var elapsedTime = renderEvent.elapsedTime;
g_clock += elapsedTime * g_timeMult;
g_teapotRoot.identity();
g_teapotRoot.rotateX(g_clock);
g_teapotRoot.rotateY(g_clock * 1.3);
}
/**
* Cleanup before exiting.
*/
function uninit() {
if (g_client) {
g_client.cleanup();
}
}
</script>
</head>
<body>
<h1>Convolution Shader Example</h1>
<p>This sample shows how to do 2D image processing using render targets. This
sample uses a convolution shader to do a 2D Gaussian blur, but the
same code could be used for any separable convolution kernel.</p>
<br/>
<!-- Start of O3D plugin -->
<div id="o3d" style="width: 512px; height: 512px;"></div>
<!-- End of O3D plugin -->
<!--
We embed the code for our effect inside this hidden textarea.
Effects contain the functions that define
the vertex and pixel shaders used by our shape.
-->
<!-- Don't render the textarea -->
<div style="display:none">
<textarea id="convFX" name="convFX" cols="80" rows="20">
uniform mat4 worldViewProjection;
uniform vec2 imageIncrement;
attribute vec4 position;
attribute vec2 texCoord0;
varying vec2 v_imageCoord;
void main() {
gl_Position = worldViewProjection * position;
// Offset image coords by half of kernel width, in image texels
v_imageCoord = texCoord0 -
(float(KERNEL_WIDTH - 1) / 2.0) * imageIncrement;
}
// #o3d SplitMarker
uniform sampler2D image;
uniform float kernel[ KERNEL_WIDTH ];
uniform vec2 imageIncrement;
varying vec2 v_imageCoord;
void main() {
vec2 imageCoordTmp = v_imageCoord;
vec4 sum = vec4(0.0, 0.0, 0.0, 0.0);
for (int i = 0; i < KERNEL_WIDTH; ++i) {
sum += texture2D(image, imageCoordTmp) * kernel[i];
imageCoordTmp += imageIncrement;
}
gl_FragColor = sum;
}
// #o3d MatrixLoadOrder RowMajor
</textarea>
</div>
</body>
</html>