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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="o3djs/base.js"></script>
-<script type="text/javascript" id="o3dscript">
-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.util.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.o3dtgz', 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">
-float4x4 worldViewProjection : WorldViewProjection;
-sampler2D image;
-float kernel[KERNEL_WIDTH];
-float2 imageIncrement;
-
-struct VertexShaderInput {
-  float4 position : POSITION;
-  float2 imageCoord : TEXCOORD0;
-};
-
-struct PixelShaderInput {
-  float4 position : POSITION;
-  float2 imageCoord : TEXCOORD0;
-};
-
-PixelShaderInput ConvolutionVS(VertexShaderInput input) {
-  PixelShaderInput output;
-  output.position = mul(input.position, worldViewProjection);
-
-  // Offset image coords by half of kernel width, in image texels
-  output.imageCoord = input.imageCoord -
-    ((KERNEL_WIDTH - 1) / 2) * imageIncrement;
-
-  return output;
-}
-
-float4 ConvolutionPS(PixelShaderInput input) : COLOR {
-  float2 imageCoord = input.imageCoord;
-  float4 sum = float4(0.0, 0.0, 0.0, 0.0);
-  for (int i = 0; i < KERNEL_WIDTH; ++i) {
-    sum += tex2D(image, imageCoord) * kernel[i];
-    imageCoord += imageIncrement;
-  }
-  return sum;
-}
-
-// #o3d VertexShaderEntryPoint ConvolutionVS
-// #o3d PixelShaderEntryPoint ConvolutionPS
-// #o3d MatrixLoadOrder RowMajor
-</textarea>
-</div>
-</body>
-
-</html>