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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)
treea2273d619f0625c9d44d40842845ccce2eac1045 /o3d/samples/juggler.html
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 Juggler
+-->
+<!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>
+ Juggler 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_transform;
+var g_clock = 0.0;
+var g_timeMult = 1; // amount to multiply elapsed time by.
+ // Used to make the animation run faster or slower.
+var g_finished = false; // for selenium testing
+var g_thetaParam;
+var g_numParam;
+var g_numBalls; // Must be either 3, 5, 7, or 9 for now.
+var g_speedScale; // Used to make higher numbers of balls animate faster.
+
+/**
+ * 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]);
+
+ 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 params the effect needs on the material.
+ effect.createUniformParameters(myMaterial);
+
+ // Create a square.
+ var myShape = o3djs.primitives.createPlane(g_pack, myMaterial,
+ 1, 1, 1, 1);
+
+ // Set up the individual parameters in our effect file.
+ g_thetaParam = myMaterial.getParam('theta');
+ g_thetaParam.value = 0;
+ g_numParam = myMaterial.getParam('num');
+ updateNum();
+
+ // Set the position of the camera.
+ 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);
+
+ toggleRenderCallback();
+
+ g_finished = true; // for selenium testing.
+}
+
+function updateNum() {
+ var group = document.the_form.radio_group;
+ for (var i = 0; i < group.length; ++i) {
+ if (group[i].checked) {
+ setNumBalls(parseInt(group[i].value));
+ }
+ }
+}
+
+function toggleRenderCallback() {
+ var box = document.the_form.check_box;
+ if (box.checked) {
+ g_client.setRenderCallback(onrender);
+ } else {
+ g_client.clearRenderCallback();
+ }
+}
+
+function setNumBalls(num) {
+ g_numBalls = num;
+ g_numParam.value = g_numBalls;
+ g_speedScale = Math.sqrt(g_numBalls) * 5;
+}
+
+function onrender(render_event) {
+ g_clock += render_event.elapsedTime * g_timeMult;
+ g_thetaParam.value = g_clock * g_speedScale;
+
+ // If we don't check the size of the client area every frame we don't get a
+ // chance to adjust the perspective matrix fast enough to keep up with the
+ // browser resizing us, so onrender must call resize.
+ resize();
+}
+
+
+// Generates the projection matrix based on the size of the g_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 = o3djs.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>Juggler</h1>
+ <p>
+ This sample displays a juggling pattern computed entirely in a shader.
+ <form name="the_form">
+ <input type="radio" name="radio_group" value="3"
+ onclick=updateNum()>3 Balls
+ <input type="radio" name="radio_group" value="5" checked
+ onclick=updateNum()>5 Balls
+ <input type="radio" name="radio_group" value="7"
+ onclick=updateNum()>7 Balls
+ <input type="radio" name="radio_group" value="9"
+ onclick=updateNum()>9 Balls
+ <input type="checkbox" name="check_box" checked
+ onclick=toggleRenderCallback()>Animate
+ </form>
+ </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;
+
+float theta;
+float num;
+
+// 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;
+ float4 color : COLOR;
+};
+
+/**
+ * vertexShaderMain - our vertex shader for the juggling texture
+ */
+PixelShaderInput vertexShaderMain(VertexShaderInput input) {
+ PixelShaderInput output;
+
+ output.position = mul(input.position, worldViewProjection);
+ output.texCoord = 4.0 * (input.texCoord - float2(0.5, 0.5));
+ output.color = float4(1, 1, 1, 1);
+
+ return output;
+}
+
+float length_2(in float2 v) {
+ return dot(v, v);
+}
+
+// Draw the balls in a single arc.
+float drawBallsInArc(in float pi,
+ in float4 offset,
+ in float2 source_hand,
+ in float2 dest_hand,
+ in float height_factor,
+ in float baseline,
+ in float ball_radius_2,
+ in float hand_throw_offset,
+ in float2 Z,
+ in float threshold) {
+ // Map theta from its current range of [0, 2 * num * pi) onto [0, (num - 1))
+ // by scaling, adding offset, and modding, then map that to [0, 1) by scaling.
+ // The first mapping tells us where in the repeating cycle we are, and the
+ // second mapping simplifies the calculation of the parabola.
+
+ // The vector offset is used to distinguish between balls in the same arc, but
+ // out of phase. At the beginning of this function, all the operations are
+ // vectorized to save instructions; we get to calculate 4 ball positions for
+ // the price of 1.
+
+ // The reason for the (num - 1) in the expression below is that with num
+ // balls, each ball spends (num - 1) beats in the air, then one in the hand.
+ // So (num - 1) is the length of time a parabola takes.
+
+ float4 time = fmod(theta / pi + offset, (num - 1)) / (num - 1);
+ float dx = dest_hand.x - source_hand.x;
+ float4 x = time * dx + source_hand.x - hand_throw_offset;
+ float4 y = time * (1 - time);
+ y = y * height_factor + baseline;
+ float4 ZX = Z.x;
+ float4 ZY = Z.y;
+ float4 len_2 = (ZX - x) * (ZX - x) + (ZY - y) * (ZY - y);
+ float4 temp = clamp((len_2 - ball_radius_2) / threshold, 0, 1);
+
+ // One minus the product of all entries in temp.
+ temp.xy = temp.xy * temp.zw;
+ return 1 - temp.x * temp.y;
+}
+
+float drawAirborneBalls(in float pi,
+ in float4 offset,
+ in float2 right_hand,
+ in float2 left_hand,
+ in float height_factor,
+ in float baseline,
+ in float ball_radius_2,
+ in float hand_swing_radius,
+ in float2 Z,
+ in float threshold) {
+ // The expression below is one minus a product. The first factor in the
+ // product is responsible for balls moving from right to left, and the second
+ // factor is responsible for balls moving from left to right.
+ return 1 -
+ (1 - drawBallsInArc(pi, offset, right_hand, left_hand, height_factor,
+ baseline, ball_radius_2, hand_swing_radius, Z, threshold)) *
+ (1 - drawBallsInArc(pi, offset + 1, left_hand, right_hand, height_factor,
+ baseline, ball_radius_2, -hand_swing_radius, Z, threshold));
+}
+
+/**
+ * pixelShaderMain - pixel shader
+ */
+
+float4 pixelShaderMain(PixelShaderInput input) : COLOR {
+ const float pi = 3.14159265;
+ const float baseline = -1.2;
+ const float2 right_hand = float2(0.8, baseline);
+ const float2 left_hand = float2(-0.8, baseline);
+ const float hand_swing_radius = 0.3;
+ const float hand_radius_2 = 0.15 * 0.15;
+ const float ball_radius_2 = 0.1 * 0.1;
+
+ const float4 ball_color = float4(1, 1, 1, 1);
+ const float4 right_hand_color = float4(1, 0, 0, 1);
+ const float4 left_hand_color = float4(0, 0, 1, 1);
+ const float4 background_color = float4(0, 0, 0, 0);
+
+ const float threshold = 0.002; // Used in clamp for antialiasing.
+
+ float height_factor = num;
+
+ float2 Z = input.texCoord;
+
+ // Coerce to the range [0, 2 * Pi * num].
+ float2 r_h = hand_swing_radius * float2(-cos(theta), sin(theta)) + right_hand;
+ float2 l_h = hand_swing_radius * float2(-cos(theta), -sin(theta)) + left_hand;
+
+ // Initialize color of pixel to background_color. Background color has an
+ // alpha of 0. Color of objects each have alpha 1, so multiplying by
+ // (1-alpha) before adding the color ensures that nothing gets overdrawn.
+ // It's kind of like a rudimentary z-buffer.
+ float4 result = background_color;
+
+ // Draw the hands.
+ result += (1 - result.a) * (
+ clamp((hand_radius_2 - length_2(Z - r_h)) / threshold, 0, 1) *
+ (Z.y < r_h.y) * right_hand_color +
+ clamp((hand_radius_2 - length_2(Z - l_h)) / threshold, 0, 1) *
+ (Z.y < l_h.y) * left_hand_color);
+
+ // Draw the ball in the hand. There is always a ball in exactly one hand, and
+ // which hand that is alternates.
+ float2 hand;
+ if (fmod(floor(theta / pi), 2) > 0.5) {
+ hand = r_h;
+ } else {
+ hand = l_h;
+ }
+ result += (1 - result.a) * ball_color *
+ clamp((ball_radius_2 - length_2(Z - hand)) / threshold, 0, 1);
+
+ float4 offset = float4(0, 2, 4, 6);
+
+ // For each of up-to-4 pairs of balls you want to add, increment offsets by
+ // (8, 8, 8, 8) and call drawAirborneBalls again.
+
+ // Draw airborne balls.
+ result += (1 - result.a) * drawAirborneBalls(pi,
+ offset,
+ right_hand,
+ left_hand,
+ height_factor,
+ baseline,
+ ball_radius_2,
+ hand_swing_radius,
+ Z,
+ threshold);
+
+ return result;
+}
+
+// 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>
generated by cgit v1.1 at 2025-01-21 13:52:27 +0000