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authorgspencer@google.com <gspencer@google.com@0039d316-1c4b-4281-b951-d872f2087c98>2009-05-27 23:15:42 +0000
committergspencer@google.com <gspencer@google.com@0039d316-1c4b-4281-b951-d872f2087c98>2009-05-27 23:15:42 +0000
commit05b47f7a8c5451f858dc220df0e3a97542edace6 (patch)
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parent5cdc8bdb4c847cefe7f4542bd10c9880c2c557a0 (diff)
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This is the O3D source tree's initial commit to the Chromium tree. It
is not built or referenced at all by the chrome build yet, and doesn't yet build in it's new home. We'll change that shortly. git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17035 0039d316-1c4b-4281-b951-d872f2087c98
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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.
+-->
+
+<!--
+O3D Julia Set
+
+This sample draws an animated julia set in real time using
+the pixel shader for the computation.
+-->
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
+ "http://www.w3.org/TR/html4/loose.dtd">
+<html style="width: 100%; height: 100%;">
+<head>
+<meta http-equiv="content-type" content="text/html; charset=UTF-8">
+<title>
+Julia Set Pixel Shader
+</title>
+
+<script type="text/javascript" src="o3djs/base.js"></script>
+
+<script type="text/javascript">
+o3djs.require('o3djs.util');
+o3djs.require('o3djs.math');
+o3djs.require('o3djs.rendergraph');
+o3djs.require('o3djs.primitives');
+
+// Events
+// Run the init() function once the page has finished loading.
+// unload() when the page is unloaded.
+window.onload = init;
+window.onunload = unload;
+// global variables
+var g_o3d;
+var g_math;
+var g_client;
+var g_o3dElement;
+var g_viewInfo;
+var g_pack;
+var g_o3dWidth = -1;
+var g_o3dHeight = -1;
+var g_clock = 0.0;
+var g_timeMult = 1;
+var g_finished = false; // for selenium testing
+var g_seedParam;
+
+/**
+ * Creates the client area.
+ */
+function init() {
+ o3djs.util.makeClients(initStep2);
+}
+
+/**
+ * Initializes o3d, loads the effect, and creates the square.
+ * @param {Array} clientElements Array of o3d object elements.
+ */
+function initStep2(clientElements) {
+ // Initialize global variables and libraries.
+ g_o3dElement = clientElements[0];
+ g_o3d = g_o3dElement.o3d;
+ g_math = o3djs.math;
+ g_client = g_o3dElement.client;
+
+ // Create a g_pack to manage our resources/assets
+ g_pack = g_client.createPack();
+
+ // Create the render graph for a view.
+ g_viewInfo = o3djs.rendergraph.createBasicView(
+ g_pack,
+ g_client.root,
+ g_client.renderGraphRoot,
+ [0, 0, 0, 1]);
+
+ // Load shader code from DOM and use it to build the effect.
+ var effect = g_pack.createObject('Effect');
+ effect.loadFromFXString(document.getElementById('shader').value);
+
+ // Create a Material for the effect.
+ var myMaterial = g_pack.createObject('Material');
+
+ // Apply our effect to this material.
+ myMaterial.effect = effect;
+
+ // Set the material's drawList for opaque objects.
+ myMaterial.drawList = g_viewInfo.performanceDrawList;
+
+ // create the parameters the effect needs to the material.
+ effect.createUniformParameters(myMaterial);
+
+ // Create a square.
+ var myShape = o3djs.primitives.createPlane(g_pack, myMaterial, 1, 1, 1, 1);
+
+ // Initialize effect parameters to something reasonable
+ g_seedParam = myMaterial.getParam('seed');
+ g_seedParam.value = [0.2, 0.5];
+
+ // Put the camera somewhere where it has a good view of that square.
+ g_viewInfo.drawContext.view = g_math.matrix4.lookAt(
+ [0, 1, 0], //eye
+ [0, 0, 0], //target
+ [0, 0, -1]); //up
+
+ // Generate the projection matrix based
+ // on the g_o3d plugin size by calling resize().
+ resize();
+
+ // Now attach the square to the root of the transform graph.
+ g_client.root.addShape(myShape);
+
+ g_client.setRenderCallback(onrender);
+
+ g_finished = true; // for selenium testing.
+}
+
+
+/**
+ * Render callback. Walks the seed of the Julia set through
+ * a parametric path in the complex plane that stays
+ * in the neighborhood of the Mandelbrot set.
+ */
+function onrender(render_event) {
+ g_clock += render_event.elapsedTime * g_timeMult;
+
+ var t = 0.1 * g_clock;
+ var x = 0.6 * Math.cos(3.0 * t) - 0.3;
+ var y = (0.5 * x + 1.7)*(0.2 * Math.sin(7 * t));
+
+ g_seedParam.value = [x, y];
+
+ resize();
+}
+
+
+/**
+ * Generates the projection matrix based on the size of the o3d plugin and
+ * calculates the view-projection matrix.
+ */
+function resize() {
+ var newWidth = g_client.width;
+ var newHeight = g_client.height;
+
+ if (newWidth != g_o3dWidth || newHeight != g_o3dHeight) {
+ g_o3dWidth = newWidth;
+ g_o3dHeight = newHeight;
+
+ // Determine what the size of the rendered square within the client should
+ // be in pixels.
+ var side = g_o3dWidth < g_o3dHeight ?
+ g_o3dWidth : g_o3dHeight;
+
+ // Convert to the region of world space that must be enclosed by the
+ // orthographic projection.
+ var worldSize = g_math.divVectorScalar([g_o3dWidth, g_o3dHeight], side);
+
+ // Find a projection matrix to transform from world space to screen space.
+ g_viewInfo.drawContext.projection = g_math.matrix4.orthographic(
+ -0.5 * worldSize[0], 0.5 * worldSize[0],
+ -0.5 * worldSize[1], 0.5 * worldSize[1],
+ 0.5, 1.5);
+ }
+}
+
+
+/**
+ * Removes any callbacks so they don't get called after the page has unloaded.
+ */
+function unload() {
+ if (g_client) {
+ g_client.cleanup();
+ }
+}
+
+
+</script>
+</head>
+<body style="width: 100%; height: 100%;">
+<table style="width: 100%; height: 100%;">
+ <tr>
+ <td>
+ <h1>Julia Set</h1>
+ <p>
+ This sample draws an animated julia set in real time using
+ the pixel shader for the computation.
+ </p>
+ <table id="container" style="width: 100%; height: 80%;">
+ <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;
+
+// The seed for the julia set (c in the expression z(n+1) = z(n)^2+c).
+float2 seed;
+
+// input parameters for our vertex shader
+struct VertexShaderInput {
+ float4 position : POSITION;
+ float2 texCoord : TEXCOORD0;
+};
+
+// input parameters for our pixel shader
+// also the output parameters for our vertex shader
+struct PixelShaderInput {
+ float4 position : POSITION;
+ float2 texCoord : TEXCOORD0;
+};
+
+/**
+ * vertexShaderMain - Multiplies position by world-view-projection matrix, and
+ * passes on texture coordinates scaled to put the origin in the center of the
+ * quad and reveal a nicely sized portion of the plane to show the julia set.
+ */
+PixelShaderInput vertexShaderMain(VertexShaderInput input) {
+ PixelShaderInput output;
+
+ output.position = mul(input.position, worldViewProjection);
+ output.texCoord = 4.0 * (input.texCoord - float2(0.5, 0.5));
+
+ return output;
+}
+
+
+/**
+ * pixelShaderMain - Calculates the color of the pixel by iterating on the
+ * formula z = z*z + seed. After some number of iterations, the magnitude of z
+ * determines the color.
+ */
+float4 pixelShaderMain(PixelShaderInput input) : COLOR {
+ float2 Z = input.texCoord;
+
+ // Number of iterations hardcoded here. The more iterations, the crisper the
+ // image.
+ for(int i = 0; i < 10; ++i) {
+ Z = float2(Z.x * Z.x - Z.y * Z.y, 2.0 * Z.x * Z.y) + seed;
+
+ // Some graphics cards and some software renderers don't appreciate large
+ // floating point values, so we clamp to prevent Z from getting that big.
+ if (i > 7) {
+ Z = clamp(Z, -25, 25);
+ }
+ }
+
+ return (1 - length(Z)) * float4(0.5, 1, 2, 1);
+}
+
+// Here we tell our effect file *which* functions are
+// our vertex and pixel shaders.
+
+// #o3d VertexShaderEntryPoint vertexShaderMain
+// #o3d PixelShaderEntryPoint pixelShaderMain
+// #o3d MatrixLoadOrder RowMajor
+ </textarea>
+ </td>
+ </tr>
+</table>
+</body>
+</html>
+
+
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