more premake4 fun and tests

Demos/DX11ClothDemo/premake4.lua

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+	
+	hasDX11 = findDirectX11()
+	
+	if (hasDX11) then
+
+		project "App_DX11ClothDemo"
+
+		initDirectX11()
+		
+		language "C++"
+				
+		defines { "UNICODE","_UNICODE"}
+				
+		kind "WindowedApp"
+		flags { "WinMain" }
+		
+		targetdir "../.."
+		includedirs {
+			"../../src",
+			"DXUT/Core",
+			"DXUT/Optional"
+		}
+		
+		links { 
+			"LinearMath","BulletCollision","BulletDynamics", "BulletSoftBody", "BulletSoftBodyDX11Solvers"
+		}
+		files {
+			"DXUT/Core/DXUT.cpp",
+			"DXUT/Optional/DXUTcamera.cpp",
+			"DXUT/Core/DXUTDevice11.cpp",
+			"DXUT/Core/DXUTDevice9.cpp",
+			"DXUT/Optional/DXUTgui.cpp",
+			"DXUT/Core/DXUTmisc.cpp",
+			"DXUT/Optional/DXUTres.cpp",
+			"DXUT/Optional/DXUTsettingsdlg.cpp",
+			"DXUT/Optional/SDKmesh.cpp",
+			"DXUT/Optional/SDKmisc.cpp",	
+			"cloth_renderer.cpp"
+		}
+		
+	end

Demos/NativeClient/bin_html/bind.js

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+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  This class implements an extension to Function object that
+ * lets you bind a scope for |this| to a function.
+ */
+
+/**
+ * Bind a scope to a function.  Used to bind an object to |this| for event
+ * handlers.
+ * @param {!Object} scope The scope in which the function executes.  |scope|
+ *     becomes |this| during function execution.
+ * @return {function} the bound version of the original function.
+ */
+Function.prototype.bind = function(scope) {
+  var boundContext = this;
+  return function() {
+    return boundContext.apply(scope, arguments);
+  }
+}

Demos/NativeClient/bin_html/dragger.js

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+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  This class implements a mouse-drag event.  It registers for
+ * mousedown events, and when it sees one, starts capturing mousemove events
+ * until it gets a mousup event.  It manufactures three drag events: the
+ * DRAG_START, DRAG and DRAG_END.
+ */
+
+// Requires bind
+
+/**
+ * Constructor for the Dragger.  Register for mousedown events that happen on
+ * |opt_target|.  If |opt_target| is null or undefined, then this object
+ * observes mousedown on the whole document.
+ * @param {?Element} opt_target The event target.  Defaults to the whole
+ *     document.
+ * @constructor
+ */
+tumbler.Dragger = function(opt_target) {
+  /**
+   * The event target.
+   * @type {Element}
+   * @private
+   */
+  this.target_ = opt_target || document;
+
+  /**
+   * The array of objects that get notified of drag events.  Each object in
+   * this array get sent a handleStartDrag(), handleDrag() and handleEndDrag()
+   * message.
+   * @type {Array.<Object>}
+   * @private
+   */
+  this.listeners_ = [];
+
+  /**
+   * Flag to indicate whether the object is in a drag sequence or not.
+   * @type {boolean}
+   * @private
+   */
+  this.isDragging_ = false;
+
+  /**
+   * The function objects that get attached as event handlers.  These are
+   * cached so that they can be removed on mouse up.
+   * @type {function}
+   * @private
+   */
+  this.boundMouseMove_ = null;
+  this.boundMouseUp_ = null;
+
+  this.target_.addEventListener('mousedown',
+                                this.onMouseDown.bind(this),
+                                false);
+}
+
+/**
+ * The ids used for drag event types.
+ * @enum {string}
+ */
+tumbler.Dragger.DragEvents = {
+  DRAG_START: 'dragstart',  // Start a drag sequence
+  DRAG: 'drag',  // Mouse moved during a drag sequence.
+  DRAG_END: 'dragend'  // End a drag sewquence.
+};
+
+/**
+ * Add a drag listener.  Each listener should respond to thhree methods:
+ * handleStartDrag(), handleDrag() and handleEndDrag().  This method assumes
+ * that |listener| does not already exist in the array of listeners.
+ * @param {!Object} listener The object that will listen to drag events.
+ */
+tumbler.Dragger.prototype.addDragListener = function(listener) {
+  this.listeners_.push(listener);
+}
+
+/**
+ * Handle a mousedown event: register for mousemove and mouseup, then tell
+ * the target that is has a DRAG_START event.
+ * @param {Event} event The mousedown event that triggered this method.
+ */
+tumbler.Dragger.prototype.onMouseDown = function(event) {
+  this.boundMouseMove_ = this.onMouseMove.bind(this);
+  this.boundMouseUp_ = this.onMouseUp.bind(this);
+  this.target_.addEventListener('mousemove', this.boundMouseMove_);
+  this.target_.addEventListener('mouseup', this.boundMouseUp_);
+  this.isDragging_ = true;
+  var dragStartEvent = { type: tumbler.Dragger.DragEvents.DRAG_START,
+                         clientX: event.offsetX,
+                         clientY: event.offsetY };
+  var i;
+  for (i = 0; i < this.listeners_.length; ++i) {
+    this.listeners_[i].handleStartDrag(this.target_, dragStartEvent);
+  }
+}
+
+/**
+ * Handle a mousemove event: tell the target that is has a DRAG event.
+ * @param {Event} event The mousemove event that triggered this method.
+ */
+tumbler.Dragger.prototype.onMouseMove = function(event) {
+  if (!this.isDragging_)
+    return;
+  var dragEvent = { type: tumbler.Dragger.DragEvents.DRAG,
+                    clientX: event.offsetX,
+                    clientY: event.offsetY};
+  var i;
+  for (i = 0; i < this.listeners_.length; ++i) {
+    this.listeners_[i].handleDrag(this.target_, dragEvent);
+  }
+}
+
+/**
+ * Handle a mouseup event: un-register for mousemove and mouseup, then tell
+ * the target that is has a DRAG_END event.
+ * @param {Event} event The mouseup event that triggered this method.
+ */
+tumbler.Dragger.prototype.onMouseUp = function(event) {
+  this.target_.removeEventListener('mouseup', this.boundMouseUp_, false);
+  this.target_.removeEventListener('mousemove', this.boundMouseMove_, false);
+  this.boundMouseUp_ = null;
+  this.boundMouseMove_ = null;
+  this.isDragging_ = false;
+  var dragEndEvent = { type: tumbler.Dragger.DragEvents.DRAG_END,
+                       clientX: event.offsetX,
+                       clientY: event.offsetY};
+  var i;
+  for (i = 0; i < this.listeners_.length; ++i) {
+    this.listeners_[i].handleEndDrag(this.target_, dragEndEvent);
+  }
+}

Demos/NativeClient/bin_html/httpd.cmd

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+@echo off
+setlocal
+
+REM Relative path of CygWin
+set CYGWIN=%~dp0%..\third_party\cygwin\bin
+
+PATH=%CYGWIN%;%PATH%
+
+python httpd.py

Demos/NativeClient/bin_html/httpd.py

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+#!/usr/bin/python
+#
+# Copyright (c) 2011, The Native Client Authors.  All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+#
+
+"""A tiny web server.
+
+This is intended to be used for testing, and only run from within the examples
+directory.
+"""
+
+import BaseHTTPServer
+import logging
+import os
+import SimpleHTTPServer
+import SocketServer
+import sys
+import urlparse
+
+logging.getLogger().setLevel(logging.INFO)
+
+# Using 'localhost' means that we only accept connections
+# via the loop back interface.
+SERVER_PORT = 5103
+SERVER_HOST = ''
+
+# We only run from the examples directory (the one that contains scons-out), so
+# that not too much is exposed via this HTTP server.  Everything in the
+# directory is served, so there should never be anything potentially sensitive
+# in the serving directory, especially if the machine might be a
+# multi-user machine and not all users are trusted.  We only serve via
+# the loopback interface.
+
+SAFE_DIR_COMPONENTS = ['bin_html']
+SAFE_DIR_SUFFIX = apply(os.path.join, SAFE_DIR_COMPONENTS)
+
+def SanityCheckDirectory():
+  if os.getcwd().endswith(SAFE_DIR_SUFFIX):
+    return
+  logging.error('httpd.py should only be run from the %s', SAFE_DIR_SUFFIX)
+  logging.error('directory for testing purposes.')
+  logging.error('We are currently in %s', os.getcwd())
+  sys.exit(1)
+
+
+# An HTTP server that will quit when |is_running| is set to False.  We also use
+# SocketServer.ThreadingMixIn in order to handle requests asynchronously for
+# faster responses.
+class QuittableHTTPServer(SocketServer.ThreadingMixIn,
+                          BaseHTTPServer.HTTPServer):
+  def serve_forever(self, timeout=0.5):
+    self.is_running = True
+    self.timeout = timeout
+    while self.is_running:
+      self.handle_request()
+
+  def shutdown(self):
+    self.is_running = False
+    return 1
+
+
+# "Safely" split a string at |sep| into a [key, value] pair.  If |sep| does not
+# exist in |str|, then the entire |str| is the key and the value is set to an
+# empty string.
+def KeyValuePair(str, sep='='):
+  if sep in str:
+    return str.split(sep)
+  else:
+    return [str, '']
+
+
+# A small handler that looks for '?quit=1' query in the path and shuts itself
+# down if it finds that parameter.
+class QuittableHTTPHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
+  def do_GET(self):
+    (_, _, _, query, _) = urlparse.urlsplit(self.path)
+    url_params = dict([KeyValuePair(key_value)
+                      for key_value in query.split('&')])
+    if 'quit' in url_params and '1' in url_params['quit']:
+      self.send_response(200, 'OK')
+      self.send_header('Content-type', 'text/html')
+      self.send_header('Content-length', '0')
+      self.end_headers()
+      self.server.shutdown()
+      return
+
+    SimpleHTTPServer.SimpleHTTPRequestHandler.do_GET(self)
+
+
+def Run(server_address,
+        server_class=QuittableHTTPServer,
+        handler_class=QuittableHTTPHandler):
+  httpd = server_class(server_address, handler_class)
+  logging.info("Starting local server on port %d", server_address[1])
+  logging.info("To shut down send http://localhost:%d?quit=1",
+               server_address[1])
+  try:
+    httpd.serve_forever()
+  except KeyboardInterrupt:
+    logging.info("Received keyboard interrupt.")
+    httpd.server_close()
+
+  logging.info("Shutting down local server on port %d", server_address[1])
+
+
+if __name__ == '__main__':
+  SanityCheckDirectory()
+  if len(sys.argv) > 1:
+    Run((SERVER_HOST, int(sys.argv[1])))
+  else:
+    Run((SERVER_HOST, SERVER_PORT))
+  sys.exit(0)

Demos/NativeClient/bin_html/index.html

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+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+          "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html>
+  <!--
+  Copyright (c) 2011 The Native Client Authors. All rights reserved.
+  Use of this source code is governed by a BSD-style license that can be
+  found in the LICENSE file.
+  -->
+  <head>
+    <title>Interactive Cube Example</title>
+    <script type="text/javascript">
+      // Provide the tumbler namespace
+      tumbler = {};
+    </script>
+    <script type="text/javascript" src="bind.js"></script>
+    <script type="text/javascript" src="dragger.js"></script>
+    <script type="text/javascript" src="tumbler.js"></script>
+    <script type="text/javascript" src="vector3.js"></script>
+    <script type="text/javascript" src="trackball.js"></script>
+  </head>
+    <body id="bodyId">
+    <h1>Interactive Cube Example</h1>
+    <p>
+      The Native Client module executed in this page draws a 3D cube
+      and allows you to rotate it using a virtual trackball method.
+    </p>
+    <div id="tumbler_view"></div>
+    <script type="text/javascript">
+      tumbler.application = new tumbler.Application();
+      tumbler.application.run('tumbler_view');
+    </script>
+  </body>
+</HTML>

Demos/NativeClient/bin_html/trackball.js

@@ -0,0 +1,296 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  Implement a virtual trackball in the tumbler.Trackball
+ * class.  This class maps 2D mouse events to 3D rotations by simulating a
+ * trackball that you roll by dragging the mouse.  There are two principle
+ * methods in the class: startAtPointInFrame which you use to begin a trackball
+ * simulation and rollToPoint, which you use while dragging the mouse.  The
+ * rollToPoint method returns a rotation expressed as a quaternion.
+ */
+
+
+// Requires tumbler.Application
+// Requires tumbler.DragEvent
+// Requires tumbler.Vector3
+
+/**
+ * Constructor for the Trackball object.  This class maps 2D mouse drag events
+ * into 3D rotations by simulating a trackball.  The idea is to simulate
+ * clicking on the trackball, and then rolling it as you drag the mouse.
+ * The math behind the trackball is simple: start with a vector from the first
+ * mouse-click on the ball to the center of the 3D view.  At the same time, set
+ * the radius  of the ball to be the smaller dimension of the 3D view.  As you
+ * drag the mouse around in the 3D view, a second vector is computed from the
+ * surface of the ball to the center.  The axis of rotation is the cross
+ * product of these two vectors, and the angle of rotation is the angle between
+ * the two vectors.
+ * @constructor
+ */
+tumbler.Trackball = function() {
+  /**
+   * The square of the trackball's radius.  The math never looks at the radius,
+   * but looks at the radius squared.
+   * @type {number}
+   * @private
+   */
+  this.sqrRadius_ = 0;
+
+  /**
+   * The 3D vector representing the point on the trackball where the mouse
+   * was clicked.  Default is pointing stright through the center of the ball.
+   * @type {Object}
+   * @private
+   */
+  this.rollStart_ = new tumbler.Vector3(0, 0, 1);
+
+  /**
+   * The 2D center of the frame that encloses the trackball.
+   * @type {!Object}
+   * @private
+   */
+  this.center_ = { x: 0, y: 0 };
+
+  /**
+   * Cached camera orientation.  When a drag START event happens this is set to
+   * the current orientation in the calling view's plugin.  The default is the
+   * identity quaternion.
+   * @type {Array.<number>}
+   * @private
+   */
+  this.cameraOrientation_ = [0, 0, 0, 1];
+};
+
+/**
+ * Compute the dimensions of the virtual trackball to fit inside |frameSize|.
+ * The radius of the trackball is set to be 1/2 of the smaller of the two frame
+ * dimensions, the center point is at the midpoint of each side.
+ * @param {!goog.math.Size} frameSize 2D-point representing the size of the
+ *     element that encloses the virtual trackball.
+ * @private
+ */
+tumbler.Trackball.prototype.initInFrame_ = function(frameSize) {
+  // Compute the radius of the virtual trackball.  This is 1/2 of the smaller
+  // of the frame's width and height.
+  var halfFrameSize = 0.5 * Math.min(frameSize.width, frameSize.height);
+  // Cache the square of the trackball's radius.
+  this.sqrRadius_ = halfFrameSize * halfFrameSize;
+  // Figure the center of the view.
+  this.center_.x = frameSize.width * 0.5;
+  this.center_.y = frameSize.height * 0.5;
+};
+
+/**
+ * Method to convert (by translation) a 2D client point from a coordinate space
+ * with origin in the lower-left corner of the client view to a space with
+ * origin in the center of the client view.  Use this method before mapping the
+ * 2D point to he 3D tackball point (see also the projectOnTrackball_() method).
+ * Call the startAtPointInFrame before calling this method so that the
+ * |center_| property is correctly initialized.
+ * @param {!Object} clientPoint map this point to the coordinate space with
+ *     origin in thecenter of the client view.
+ * @return {Object} the converted point.
+ * @private
+ */
+tumbler.Trackball.prototype.convertClientPoint_ = function(clientPoint) {
+  var difference = { x: clientPoint.x - this.center_.x,
+                     y: clientPoint.y - this.center_.y }
+  return difference;
+};
+
+/**
+ * Method to map a 2D point to a 3D point on the virtual trackball that was set
+ * up using the startAtPointInFrame method.  If the point lies outside of the
+ * radius of the virtual trackball, then the z-coordinate of the 3D point
+ * is set to 0.
+ * @param {!Object.<x, y>} point 2D-point in the coordinate space with origin
+ *     in the center of the client view.
+ * @return {tumbler.Vector3} the 3D point on the virtual trackball.
+ * @private
+ */
+tumbler.Trackball.prototype.projectOnTrackball_ = function(point) {
+  var sqrRadius2D = point.x * point.x + point.y * point.y;
+  var zValue;
+  if (sqrRadius2D > this.sqrRadius_) {
+    // |point| lies outside the virtual trackball's sphere, so use a virtual
+    // z-value of 0.  This is equivalent to clicking on the horizontal equator
+    // of the trackball.
+    zValue = 0;
+  } else {
+    // A sphere can be defined as: r^2 = x^2 + y^2 + z^2, so z =
+    // sqrt(r^2 - (x^2 + y^2)).
+    zValue = Math.sqrt(this.sqrRadius_ - sqrRadius2D);
+  }
+  var trackballPoint = new tumbler.Vector3(point.x, point.y, zValue);
+  return trackballPoint;
+};
+
+/**
+ * Method to start up the trackball.  The trackball works by pretending that a
+ * ball encloses the 3D view.  You roll this pretend ball with the mouse.  For
+ * example, if you click on the center of the ball and move the mouse straight
+ * to the right, you roll the ball around its Y-axis.  This produces a Y-axis
+ * rotation.  You can click on the "edge" of the ball and roll it around
+ * in a circle to get a Z-axis rotation.
+ * @param {!Object.<x, y>} startPoint 2D-point, usually the mouse-down
+ *     point.
+ * @param {!Object.<width, height>} frameSize 2D-point representing the size of
+ *     the element that encloses the virtual trackball.
+ */
+tumbler.Trackball.prototype.startAtPointInFrame =
+    function(startPoint, frameSize) {
+  this.initInFrame_(frameSize);
+  // Compute the starting vector from the surface of the ball to its center.
+  this.rollStart_ = this.projectOnTrackball_(
+      this.convertClientPoint_(startPoint));
+};
+
+/**
+ * Method to roll the virtual trackball; call this in response to a mouseDrag
+ * event.  Takes |dragPoint| and projects it from 2D mouse coordinates onto the
+ * virtual track ball that was set up in startAtPointInFrame method.
+ * Returns a quaternion that represents the rotation from |rollStart_| to
+ * |rollEnd_|.
+ * @param {!Object.<x, y>} dragPoint 2D-point representing the
+ *     destination mouse point.
+ * @return {Array.<number>} a quaternion that represents the rotation from
+ *     the point wnere the mouse was clicked on the trackball to this point.
+ *     The quaternion looks like this: [[v], cos(angle/2)], where [v] is the
+ *     imaginary part of the quaternion and is computed as [x, y, z] *
+ *     sin(angle/2).
+ */
+tumbler.Trackball.prototype.rollToPoint = function(dragPoint) {
+  var rollTo = this.convertClientPoint_(dragPoint);
+  if ((Math.abs(this.rollStart_.x - rollTo.x) <
+               tumbler.Trackball.DOUBLE_EPSILON) &&
+      (Math.abs(this.rollStart_.y, rollTo.y) <
+               tumbler.Trackball.DOUBLE_EPSILON)) {
+    // Not enough change in the vectors to roll the ball, return the identity
+    // quaternion.
+    return [0, 0, 0, 1];
+  }
+
+  // Compute the ending vector from the surface of the ball to its center.
+  var rollEnd = this.projectOnTrackball_(rollTo);
+
+  // Take the cross product of the two vectors. r = s X e
+  var rollVector = this.rollStart_.cross(rollEnd);
+  var invStartMag = 1.0 / this.rollStart_.magnitude();
+  var invEndMag = 1.0 / rollEnd.magnitude();
+
+  // cos(a) = (s . e) / (||s|| ||e||)
+  var cosAng = this.rollStart_.dot(rollEnd) * invStartMag * invEndMag;
+  // sin(a) = ||(s X e)|| / (||s|| ||e||)
+  var sinAng = rollVector.magnitude() * invStartMag * invEndMag;
+  // Build a quaternion that represents the rotation about |rollVector|.
+  // Use atan2 for a better angle.  If you use only cos or sin, you only get
+  // half the possible angles, and you can end up with rotations that flip
+  // around near the poles.
+  var rollHalfAngle = Math.atan2(sinAng, cosAng) * 0.5;
+  rollVector.normalize();
+  // The quaternion looks like this: [[v], cos(angle/2)], where [v] is the
+  // imaginary part of the quaternion and is computed as [x, y, z] *
+  // sin(angle/2).
+  rollVector.scale(Math.sin(rollHalfAngle));
+  var ballQuaternion = [rollVector.x,
+                        rollVector.y,
+                        rollVector.z,
+                        Math.cos(rollHalfAngle)];
+  return ballQuaternion;
+};
+
+/**
+ * Handle the drag START event: grab the current camera orientation from the
+ * sending view and set up the virtual trackball.
+ * @param {!tumbler.Application} view The view controller that called this
+ *     method.
+ * @param {!tumbler.DragEvent} dragStartEvent The DRAG_START event that
+ *     triggered this handler.
+ */
+tumbler.Trackball.prototype.handleStartDrag =
+    function(controller, dragStartEvent) {
+  // Cache the camera orientation.  The orientations from the trackball as it
+  // rolls are concatenated to this orientation and pushed back into the
+  // plugin on the other side of the JavaScript bridge.
+  controller.setCameraOrientation(this.cameraOrientation_);
+  // Invert the y-coordinate for the trackball computations.
+  var frameSize = { width: controller.offsetWidth,
+                    height: controller.offsetHeight };
+  var flippedY = { x: dragStartEvent.clientX,
+                   y: frameSize.height - dragStartEvent.clientY };
+  this.startAtPointInFrame(flippedY, frameSize);
+};
+
+/**
+ * Handle the drag DRAG event: concatenate the current orientation to the
+ * cached orientation.  Send this final value through to the GSPlugin via the
+ * setValueForKey() method.
+ * @param {!tumbler.Application} view The view controller that called this
+ *     method.
+ * @param {!tumbler.DragEvent} dragEvent The DRAG event that triggered this
+ *     handler.
+ */
+tumbler.Trackball.prototype.handleDrag =
+    function(controller, dragEvent) {
+  // Flip the y-coordinate so that the 2D origin is in the lower-left corner.
+  var frameSize = { width: controller.offsetWidth,
+                    height: controller.offsetHeight };
+  var flippedY = { x: dragEvent.clientX,
+                   y: frameSize.height - dragEvent.clientY };
+  controller.setCameraOrientation(
+      tumbler.multQuaternions(this.rollToPoint(flippedY),
+                              this.cameraOrientation_));
+};
+
+/**
+ * Handle the drag END event: get the final orientation and concatenate it to
+ * the cached orientation.
+ * @param {!tumbler.Application} view The view controller that called this
+ *     method.
+ * @param {!tumbler.DragEvent} dragEndEvent The DRAG_END event that triggered
+ *     this handler.
+ */
+tumbler.Trackball.prototype.handleEndDrag =
+    function(controller, dragEndEvent) {
+  // Flip the y-coordinate so that the 2D origin is in the lower-left corner.
+  var frameSize = { width: controller.offsetWidth,
+                    height: controller.offsetHeight };
+  var flippedY = { x: dragEndEvent.clientX,
+                   y: frameSize.height - dragEndEvent.clientY };
+  this.cameraOrientation_ = tumbler.multQuaternions(this.rollToPoint(flippedY),
+                                                    this.cameraOrientation_);
+  controller.setCameraOrientation(this.cameraOrientation_);
+};
+
+/**
+ * A utility function to multiply two quaterions.  Returns the product q0 * q1.
+ * This is effectively the same thing as concatenating the two rotations
+ * represented in each quaternion together. Note that quaternion multiplication
+ * is NOT commutative: q0 * q1 != q1 * q0.
+ * @param {!Array.<number>} q0 A 4-element array representing the first
+ *     quaternion.
+ * @param {!Array.<number>} q1 A 4-element array representing the second
+ *     quaternion.
+ * @return {Array.<number>} A 4-element array representing the product q0 * q1.
+ */
+tumbler.multQuaternions = function(q0, q1) {
+  // Return q0 * q1 (note the order).
+  var qMult = [
+      q0[3] * q1[0] + q0[0] * q1[3] + q0[1] * q1[2] - q0[2] * q1[1],
+      q0[3] * q1[1] - q0[0] * q1[2] + q0[1] * q1[3] + q0[2] * q1[0],
+      q0[3] * q1[2] + q0[0] * q1[1] - q0[1] * q1[0] + q0[2] * q1[3],
+      q0[3] * q1[3] - q0[0] * q1[0] - q0[1] * q1[1] - q0[2] * q1[2]
+  ];
+  return qMult;
+};
+
+/**
+ * Real numbers that are less than this distance apart are considered
+ * equivalent.
+ * TODO(dspringer): It seems as though there should be a const like this
+ * in Closure somewhere (goog.math?).
+ * @type {number}
+ */
+tumbler.Trackball.DOUBLE_EPSILON = 1.0e-16;

Demos/NativeClient/bin_html/tumbler.js

@@ -0,0 +1,133 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  The tumbler Application object.  This object instantiates a
+ * Trackball object and connects it to the element named |tumbler_content|.
+ * It also conditionally embeds a debuggable module or a release module into
+ * the |tumbler_content| element.
+ */
+
+// Requires tumbler
+// Requires tumbler.Dragger
+// Requires tumbler.Trackball
+
+/**
+ * Constructor for the Application class.  Use the run() method to populate
+ * the object with controllers and wire up the events.
+ * @constructor
+ */
+tumbler.Application = function() {
+  /**
+   * The native module for the application.  This refers to the module loaded
+   * via the <embed> tag.
+   * @type {Element}
+   * @private
+   */
+  this.module_ = null;
+
+  /**
+   * The trackball object.
+   * @type {tumbler.Trackball}
+   * @private
+   */
+  this.trackball_ = null;
+
+  /**
+   * The mouse-drag event object.
+   * @type {tumbler.Dragger}
+   * @private
+   */
+  this.dragger_ = null;
+
+  /**
+   * The function objects that get attached as event handlers.  These are
+   * cached so that they can be removed when they are no longer needed.
+   * @type {function}
+   * @private
+   */
+  this.boundModuleDidLoad_ = null;
+}
+
+/**
+ * The ids used for elements in the DOM.  The Tumlber Application expects these
+ * elements to exist.
+ * @enum {string}
+ * @private
+ */
+tumbler.Application.DomIds_ = {
+  MODULE: 'tumbler',  // The <embed> element representing the NaCl module
+  VIEW: 'tumbler_view'  // The <div> containing the NaCl element.
+}
+
+/**
+ * Called by the module loading function once the module has been loaded.
+ * @param {?Element} nativeModule The instance of the native module.
+ */
+tumbler.Application.prototype.moduleDidLoad = function() {
+  this.module_ = document.getElementById(tumbler.Application.DomIds_.MODULE);
+  // Unbind the load function.
+  this.boundModuleDidLoad_ = null;
+
+  /**
+   * Set the camera orientation property on the NaCl module.
+   * @param {Array.<number>} orientation A 4-element array representing the
+   *     camera orientation as a quaternion.
+   */
+  this.module_.setCameraOrientation = function(orientation) {
+      var methodString = 'setCameraOrientation ' +
+                         'orientation:' +
+                         JSON.stringify(orientation);
+      this.postMessage(methodString);
+  }
+
+  this.trackball_ = new tumbler.Trackball();
+  this.dragger_ = new tumbler.Dragger(this.module_);
+  this.dragger_.addDragListener(this.trackball_);
+}
+
+/**
+ * Asserts that cond is true; issues an alert and throws an Error otherwise.
+ * @param {bool} cond The condition.
+ * @param {String} message The error message issued if cond is false.
+ */
+tumbler.Application.prototype.assert = function(cond, message) {
+  if (!cond) {
+    message = "Assertion failed: " + message;
+    alert(message);
+    throw new Error(message);
+  }
+}
+
+/**
+ * The run() method starts and 'runs' the application.  The trackball object
+ * is allocated and all the events get wired up.
+ * @param {?String} opt_contentDivName The id of a DOM element in which to
+ *     embed the Native Client module.  If unspecified, defaults to
+ *     VIEW.  The DOM element must exist.
+ */
+tumbler.Application.prototype.run = function(opt_contentDivName) {
+  contentDivName = opt_contentDivName || tumbler.Application.DomIds_.VIEW;
+  var contentDiv = document.getElementById(contentDivName);
+  this.assert(contentDiv, "Missing DOM element '" + contentDivName + "'");
+
+  // Note that the <EMBED> element is wrapped inside a <DIV>, which has a 'load'
+  // event listener attached.  This method is used instead of attaching the
+  // 'load' event listener directly to the <EMBED> element to ensure that the
+  // listener is active before the NaCl module 'load' event fires.
+  this.boundModuleDidLoad_ = this.moduleDidLoad.bind(this);
+  contentDiv.addEventListener('load', this.boundModuleDidLoad_, true);
+
+  // Load the published .nexe.  This includes the 'nacl' attribute which
+  // shows how to load multi-architecture modules.  Each entry in the "nexes"
+  // object in the  .nmf manifest file is a key-value pair: the key is the
+  // runtime ('x86-32', 'x86-64', etc.); the value is a URL for the desired
+  // NaCl module.  To load the debug versions of your .nexes, set the 'nacl'
+  //  attribute to the _dbg.nmf version of the manifest file.
+  contentDiv.innerHTML = '<embed id="'
+                         + tumbler.Application.DomIds_.MODULE + '" '
+                         + 'src=tumbler.nmf '
+                         + 'type="application/x-nacl" '
+                         + 'width="480" height="480" />'
+}

Demos/NativeClient/bin_html/tumbler.nmf

@@ -0,0 +1,6 @@
+{
+  "program": {
+    "x86-64": {"url": "NativeClientTumbler_x64.exe"},
+    "x86-32": {"url": "NativeClientTumbler.exe"}
+  }
+}

Demos/NativeClient/bin_html/vector3.js

@@ -0,0 +1,91 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+/**
+ * @fileoverview  A 3D vector class.  Proviudes some utility functions on
+ * 3-dimentional vectors.
+ */
+
+// Requires tumbler
+
+/**
+ * Constructor for the Vector3 object.  This class contains a 3-tuple that
+ * represents a vector in 3D space.
+ * @param {?number} opt_x The x-coordinate for this vector.  If null or
+ *     undefined, the x-coordinate value is set to 0.
+ * @param {?number} opt_y The y-coordinate for this vector.  If null or
+ *     undefined, the y-coordinate value is set to 0.
+ * @param {?number} opt_z The z-coordinate for this vector.  If null or
+ *     undefined, the z-coordinate value is set to 0.
+ * @constructor
+ */
+tumbler.Vector3 = function(opt_x, opt_y, opt_z) {
+  /**
+   * The vector's 3-tuple.
+   * @type {number}
+   */
+  this.x = opt_x || 0;
+  this.y = opt_y || 0;
+  this.z = opt_z || 0;
+}
+
+/**
+ * Method to return the magnitude of a Vector3.
+ * @return {number} the magnitude of the vector.
+ */
+tumbler.Vector3.prototype.magnitude = function() {
+  return Math.sqrt(this.dot(this));
+}
+
+/**
+ * Normalize the vector in-place.
+ * @return {number} the magnitude of the vector.
+ */
+tumbler.Vector3.prototype.normalize = function() {
+  var mag = this.magnitude();
+  if (mag < tumbler.Vector3.DOUBLE_EPSILON)
+    return 0.0;  // |this| is equivalent to the 0-vector, don't normalize.
+  this.scale(1.0 / mag);
+  return mag;
+}
+
+/**
+ * Scale the vector in-place by |s|.
+ * @param {!number} s The scale factor.
+ */
+tumbler.Vector3.prototype.scale = function(s) {
+  this.x *= s;
+  this.y *= s;
+  this.z *= s;
+}
+
+/**
+ * Compute the dot product: |this| . v.
+ * @param {!tumbler.Vector3} v The vector to dot.
+ * @return {number} the result of |this| . v.
+ */
+tumbler.Vector3.prototype.dot = function(v) {
+  return this.x * v.x + this.y * v.y + this.z * v.z;
+}
+
+/**
+ * Compute the cross product: |this| X v.
+ * @param {!tumbler.Vector3} v The vector to cross with.
+ * @return {tumbler.Vector3} the result of |this| X v.
+ */
+tumbler.Vector3.prototype.cross = function(v) {
+  var vCross = new tumbler.Vector3(this.y * v.z - this.z * v.y,
+                                   this.z * v.x - this.x * v.z,
+                                   this.x * v.y - this.y * v.x);
+  return vCross;
+}
+
+/**
+ * Real numbers that are less than this distance apart are considered
+ * equivalent.
+ * TODO(dspringer): It seems as though there should be a const like this
+ * in generally available somewhere.
+ * @type {number}
+ */
+tumbler.Vector3.DOUBLE_EPSILON = 1.0e-16;

Demos/NativeClient/callback.h

@@ -0,0 +1,92 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_CALLBACK_H_
+#define EXAMPLES_TUMBLER_CALLBACK_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+namespace tumbler {
+
+class ScriptingBridge;
+
+// Templates used to support method call-backs when a method or property is
+// accessed from the browser code.
+
+// Class suite used to publish a method name to Javascript.  Typical use is
+// like this:
+//     photo::MethodCallback<Calculator>* calculate_callback_;
+//     calculate_callback_ =
+//        new scripting::MethodCallback<Calculator>(this,
+//                                                  &Calculator::Calculate);
+//     bridge->AddMethodNamed("calculate", calculate_callback_);
+//     ...
+//     delete calculate_callback_;
+//
+// The caller must delete the callback.
+
+// Methods get parameters as a dictionary that maps parameter names to values.
+typedef std::map<std::string, std::string> MethodParameter;
+
+// Pure virtual class used in STL containers.
+class MethodCallbackExecutor {
+ public:
+  virtual ~MethodCallbackExecutor() {}
+  virtual void Execute(
+      const ScriptingBridge& bridge,
+      const MethodParameter& parameters) = 0;
+};
+
+template <class T>
+class MethodCallback : public MethodCallbackExecutor {
+ public:
+  typedef void (T::*Method)(
+      const ScriptingBridge& bridge,
+      const MethodParameter& parameters);
+
+  MethodCallback(T* instance, Method method)
+      : instance_(instance), method_(method) {}
+  virtual ~MethodCallback() {}
+  virtual void Execute(
+      const ScriptingBridge& bridge,
+      const MethodParameter& parameters) {
+    // Use "this->" to force C++ to look inside our templatized base class; see
+    // Effective C++, 3rd Ed, item 43, p210 for details.
+    ((this->instance_)->*(this->method_))(bridge, parameters);
+  }
+
+ private:
+  T* instance_;
+  Method method_;
+};
+
+template <class T>
+class ConstMethodCallback : public MethodCallbackExecutor {
+ public:
+  typedef void (T::*ConstMethod)(
+      const ScriptingBridge& bridge,
+      const MethodParameter& parameters) const;
+
+  ConstMethodCallback(const T* instance, ConstMethod method)
+      : instance_(instance), const_method_(method) {}
+  virtual ~ConstMethodCallback() {}
+  virtual void Execute(
+      const ScriptingBridge& bridge,
+      const MethodParameter& parameters) {
+    // Use "this->" to force C++ to look inside our templatized base class; see
+    // Effective C++, 3rd Ed, item 43, p210 for details.
+    ((this->instance_)->*(this->const_method_))(bridge, parameters);
+  }
+
+ private:
+  const T* instance_;
+  ConstMethod const_method_;
+};
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_CALLBACK_H_
+

Demos/NativeClient/cube.cc

@@ -0,0 +1,267 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "cube.h"
+
+#include <algorithm>
+
+#include "shader_util.h"
+#include "transforms.h"
+
+namespace tumbler {
+
+static const size_t kVertexCount = 24;
+static const int kIndexCount = 36;
+
+Cube::Cube(SharedOpenGLContext opengl_context)
+    : opengl_context_(opengl_context),
+      width_(1),
+      height_(1) {
+  eye_[0] = eye_[1] = 0.0f;
+  eye_[2] = 2.0f;
+  orientation_[0] = 0.0f;
+  orientation_[1] = 0.0f;
+  orientation_[2] = 0.0f;
+  orientation_[3] = 1.0f;
+}
+
+Cube::~Cube() {
+  glDeleteBuffers(3, cube_vbos_);
+  glDeleteProgram(shader_program_object_);
+}
+
+void Cube::PrepareOpenGL() {
+  CreateShaders();
+  CreateCube();
+  glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
+  glEnable(GL_DEPTH_TEST);
+}
+
+void Cube::Resize(int width, int height) {
+  width_ = std::max(width, 1);
+  height_ = std::max(height, 1);
+  // Set the viewport
+  glViewport(0, 0, width_, height_);
+  // Compute the perspective projection matrix with a 60 degree FOV.
+  GLfloat aspect = static_cast<GLfloat>(width_) / static_cast<GLfloat>(height_);
+  transform_4x4::LoadIdentity(perspective_proj_);
+  transform_4x4::Perspective(perspective_proj_, 60.0f, aspect, 1.0f, 20.0f);
+}
+
+void Cube::Draw() {
+  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+  // Compute a new model-view matrix, then use that to make the composite
+  // model-view-projection matrix: MVP = MV . P.
+  GLfloat model_view[16];
+  ComputeModelViewTransform(model_view);
+  transform_4x4::Multiply(mvp_matrix_, model_view, perspective_proj_);
+
+  glBindBuffer(GL_ARRAY_BUFFER, cube_vbos_[0]);
+  glUseProgram(shader_program_object_);
+  glEnableVertexAttribArray(position_location_);
+  glVertexAttribPointer(position_location_,
+                        3,
+                        GL_FLOAT,
+                        GL_FALSE,
+                        3 * sizeof(GLfloat),
+                        NULL);
+  glEnableVertexAttribArray(color_location_);
+  glBindBuffer(GL_ARRAY_BUFFER, cube_vbos_[1]);
+  glVertexAttribPointer(color_location_,
+                        3,
+                        GL_FLOAT,
+                        GL_FALSE,
+                        3 * sizeof(GLfloat),
+                        NULL);
+  glUniformMatrix4fv(mvp_location_, 1, GL_FALSE, mvp_matrix_);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cube_vbos_[2]);
+  glDrawElements(GL_TRIANGLES, kIndexCount, GL_UNSIGNED_SHORT, 0);
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+}
+
+bool Cube::CreateShaders() {
+  const char vertex_shader_src[] =
+    "uniform mat4 u_mvpMatrix;                   \n"
+    "attribute vec4 a_position;                  \n"
+    "attribute vec3 a_color;                     \n"
+    "varying lowp vec4 v_color;                  \n"
+    "void main()                                 \n"
+    "{                                           \n"
+    "   v_color.xyz = a_color;                   \n"
+    "   v_color.w = 1.0;                         \n"
+    "   gl_Position = u_mvpMatrix * a_position;  \n"
+    "}                                           \n";
+
+  const char fragment_shader_src[] =
+    "varying lowp vec4 v_color;                   \n"
+    "void main()                                  \n"
+    "{                                            \n"
+    "  gl_FragColor = v_color;                    \n"
+    "}                                            \n";
+
+  // Load the shaders and get a linked program object
+  shader_program_object_ =
+      shader_util::CreateProgramFromVertexAndFragmentShaders(
+      vertex_shader_src, fragment_shader_src);
+  if (shader_program_object_ == 0)
+    return false;
+  position_location_ = glGetAttribLocation(shader_program_object_,
+                                           "a_position");
+  color_location_ = glGetAttribLocation(shader_program_object_, "a_color");
+  mvp_location_ = glGetUniformLocation(shader_program_object_, "u_mvpMatrix");
+  return true;
+}
+
+void Cube::CreateCube() {
+  static const GLfloat cube_vertices[] = {
+    // Vertex coordinates interleaved with color values
+    // Bottom
+    -0.5f, -0.5f, -0.5f,
+    -0.5f, -0.5f, 0.5f,
+    0.5f, -0.5f, 0.5f,
+    0.5f, -0.5f, -0.5f,
+    // Top
+    -0.5f, 0.5f, -0.5f,
+    -0.5f, 0.5f, 0.5f,
+    0.5f, 0.5f, 0.5f,
+    0.5f, 0.5f, -0.5f,
+    // Back
+    -0.5f, -0.5f, -0.5f,
+    -0.5f, 0.5f, -0.5f,
+    0.5f, 0.5f, -0.5f,
+    0.5f, -0.5f, -0.5f,
+    // Front
+    -0.5f, -0.5f, 0.5f,
+    -0.5f, 0.5f, 0.5f,
+    0.5f, 0.5f, 0.5f,
+    0.5f, -0.5f, 0.5f,
+    // Left
+    -0.5f, -0.5f, -0.5f,
+    -0.5f, -0.5f, 0.5f,
+    -0.5f, 0.5f, 0.5f,
+    -0.5f, 0.5f, -0.5f,
+    // Right
+    0.5f, -0.5f, -0.5f,
+    0.5f, -0.5f, 0.5f,
+    0.5f, 0.5f, 0.5f,
+    0.5f, 0.5f, -0.5f
+  };
+
+  static const GLfloat cube_colors[] = {
+    // Vertex coordinates interleaved with color values
+    // Bottom
+    1.0, 0.0, 0.0,
+    1.0, 0.0, 0.0,
+    1.0, 0.0, 0.0,
+    1.0, 0.0, 0.0,
+    // Top
+    0.0, 1.0, 0.0,
+    0.0, 1.0, 0.0,
+    0.0, 1.0, 0.0,
+    0.0, 1.0, 0.0,
+    // Back
+    0.0, 0.0, 1.0,
+    0.0, 0.0, 1.0,
+    0.0, 0.0, 1.0,
+    0.0, 0.0, 1.0,
+    // Front
+    1.0, 0.0, 1.0,
+    1.0, 0.0, 1.0,
+    1.0, 0.0, 1.0,
+    1.0, 0.0, 1.0,
+    // Left
+    1.0, 1.0, 0.0,
+    1.0, 1.0, 0.0,
+    1.0, 1.0, 0.0,
+    1.0, 1.0, 0.0,
+    // Right
+    0.0, 1.0, 1.0,
+    0.0, 1.0, 1.0,
+    0.0, 1.0, 1.0,
+    0.0, 1.0, 1.0
+  };
+
+  static const GLushort cube_indices[] = {
+    // Bottom
+    0, 2, 1,
+    0, 3, 2,
+    // Top
+    4, 5, 6,
+    4, 6, 7,
+    // Back
+    8, 9, 10,
+    8, 10, 11,
+    // Front
+    12, 15, 14,
+    12, 14, 13,
+    // Left
+    16, 17, 18,
+    16, 18, 19,
+    // Right
+    20, 23, 22,
+    20, 22, 21
+  };
+
+  // Generate the VBOs and upload them to the graphics context.
+  glGenBuffers(3, cube_vbos_);
+  glBindBuffer(GL_ARRAY_BUFFER, cube_vbos_[0]);
+  glBufferData(GL_ARRAY_BUFFER,
+               kVertexCount * sizeof(GLfloat) * 3,
+               cube_vertices,
+               GL_STATIC_DRAW);
+  glBindBuffer(GL_ARRAY_BUFFER, cube_vbos_[1]);
+  glBufferData(GL_ARRAY_BUFFER,
+               kVertexCount * sizeof(GLfloat) * 3,
+               cube_colors,
+               GL_STATIC_DRAW);
+  glBindBuffer(GL_ARRAY_BUFFER, 0);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, cube_vbos_[2]);
+  glBufferData(GL_ELEMENT_ARRAY_BUFFER,
+               kIndexCount * sizeof(GL_UNSIGNED_SHORT),
+               cube_indices,
+               GL_STATIC_DRAW);
+  glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
+}
+
+void Cube::ComputeModelViewTransform(GLfloat* model_view) {
+  // This method takes into account the possiblity that |orientation_|
+  // might not be normalized.
+  double sqrx = orientation_[0] * orientation_[0];
+  double sqry = orientation_[1] * orientation_[1];
+  double sqrz = orientation_[2] * orientation_[2];
+  double sqrw = orientation_[3] * orientation_[3];
+  double sqrLength = 1.0 / (sqrx + sqry + sqrz + sqrw);
+
+  transform_4x4::LoadIdentity(model_view);
+  model_view[0] = (sqrx - sqry - sqrz + sqrw) * sqrLength;
+  model_view[5] = (-sqrx + sqry - sqrz + sqrw) * sqrLength;
+  model_view[10] = (-sqrx - sqry + sqrz + sqrw) * sqrLength;
+
+  double temp1 = orientation_[0] * orientation_[1];
+  double temp2 = orientation_[2] * orientation_[3];
+  model_view[1] = 2.0 * (temp1 + temp2) * sqrLength;
+  model_view[4] = 2.0 * (temp1 - temp2) * sqrLength;
+
+  temp1 = orientation_[0] * orientation_[2];
+  temp2 = orientation_[1] * orientation_[3];
+  model_view[2] = 2.0 * (temp1 - temp2) * sqrLength;
+  model_view[8] = 2.0 * (temp1 + temp2) * sqrLength;
+  temp1 = orientation_[1] * orientation_[2];
+  temp2 = orientation_[0] * orientation_[3];
+  model_view[6] = 2.0 * (temp1 + temp2) * sqrLength;
+  model_view[9] = 2.0 * (temp1 - temp2) * sqrLength;
+  model_view[3] = 0.0;
+  model_view[7] = 0.0;
+  model_view[11] = 0.0;
+
+  // Concatenate the translation to the eye point.
+  model_view[12] = -eye_[0];
+  model_view[13] = -eye_[1];
+  model_view[14] = -eye_[2];
+  model_view[15] = 1.0;
+}
+
+}  // namespace tumbler

Demos/NativeClient/cube.h

@@ -0,0 +1,97 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_CUBE_H_
+#define EXAMPLES_TUMBLER_CUBE_H_
+
+#include <GLES2/gl2.h>
+#include <vector>
+#include "opengl_context.h"
+#include "opengl_context_ptrs.h"
+
+namespace tumbler {
+
+// The Cube class provides a place to implement 3D rendering.  It has a
+// frame that it occupies in a browser window.
+class Cube {
+ public:
+  explicit Cube(SharedOpenGLContext opengl_context);
+  ~Cube();
+
+  // Called once when a new RenderContext is first bound to the view.  The
+  // bound context is guaranteed to be current and valid before calling this
+  // method.
+  void PrepareOpenGL();
+
+  // Called whenever the size of the browser view changes.  This method is
+  // called at least once when the view is first made visible.  Clamps the
+  // sizes to 1.
+  void Resize(int width, int height);
+
+  // Called every time the view need to be drawn.  The bound context is
+  // guaranteed to be current and valid before this method is called.  The
+  // visible portion of the context is flushed to the browser after this
+  // method returns.
+  void Draw();
+
+  // Accessor for width and height.  To change these, call Resize.
+  const int width() const {
+    return width_;
+  }
+
+  const int height() const {
+    return height_;
+  }
+
+  // Accessor/mutator for the camera orientation.
+  void GetOrientation(std::vector<float>* orientation) const {
+    if (!orientation)
+      return;
+    (*orientation)[0] = static_cast<float>(orientation_[0]);
+    (*orientation)[1] = static_cast<float>(orientation_[1]);
+    (*orientation)[2] = static_cast<float>(orientation_[2]);
+    (*orientation)[3] = static_cast<float>(orientation_[3]);
+  }
+  void SetOrientation(const std::vector<float>& orientation) {
+    orientation_[0] = static_cast<GLfloat>(orientation[0]);
+    orientation_[1] = static_cast<GLfloat>(orientation[1]);
+    orientation_[2] = static_cast<GLfloat>(orientation[2]);
+    orientation_[3] = static_cast<GLfloat>(orientation[3]);
+  }
+
+ private:
+  // Create the shaders used to draw the cube, and link them into a program.
+  // Initializes |shader_progam_object_|, |position_loction_| and
+  // |mvp_location_|.
+  bool CreateShaders();
+
+  // Generates a cube as a series of GL_TRIANGLE_STRIPs, and initializes
+  // |index_count_| to the number of indices in the index list used as a VBO.
+  // Creates the |vbo_ids_| required for the vertex and index data and uploads
+  // the the VBO data.
+  void CreateCube();
+
+  // Build up the model-view transform from the eye and orienation properties.
+  // Assumes that |model_view| is a 4x4 matrix.
+  void ComputeModelViewTransform(GLfloat* model_view);
+
+  SharedOpenGLContext opengl_context_;
+  int width_;
+  int height_;
+  GLuint shader_program_object_;  // The compiled shaders.
+  GLint position_location_;  // The position attribute location.
+  GLint color_location_;  // The color attribute location.
+  GLint mvp_location_;  // The Model-View-Projection composite matrix.
+  GLuint cube_vbos_[3];
+  GLfloat eye_[3];  // The eye point of the virtual camera.
+  // The orientation of the virtual camera stored as a quaternion.  The
+  // quaternion is laid out as {{x, y, z}, w}.
+  GLfloat orientation_[4];
+  GLfloat perspective_proj_[16];
+  GLfloat mvp_matrix_[16];
+};
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_CUBE_H_

Demos/NativeClient/opengl_context.cc

@@ -0,0 +1,72 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "opengl_context.h"
+
+#include <pthread.h>
+#include "ppapi/gles2/gl2ext_ppapi.h"
+
+namespace {
+// This is called by the brower when the 3D context has been flushed to the
+// browser window.
+void FlushCallback(void* data, int32_t result) {
+  static_cast<tumbler::OpenGLContext*>(data)->set_flush_pending(false);
+}
+}  // namespace
+
+namespace tumbler {
+
+OpenGLContext::OpenGLContext(pp::Instance* instance)
+    : pp::Graphics3DClient_Dev(instance),
+      flush_pending_(false) {
+  pp::Module* module = pp::Module::Get();
+  assert(module);
+  gles2_interface_ = static_cast<const struct PPB_OpenGLES2_Dev*>(
+      module->GetBrowserInterface(PPB_OPENGLES2_DEV_INTERFACE));
+  assert(gles2_interface_);
+}
+
+OpenGLContext::~OpenGLContext() {
+  glSetCurrentContextPPAPI(0);
+}
+
+bool OpenGLContext::MakeContextCurrent(pp::Instance* instance) {
+  if (instance == NULL) {
+    glSetCurrentContextPPAPI(0);
+    return false;
+  }
+  // Lazily create the Pepper context.
+  if (context_.is_null()) {
+    context_ = pp::Context3D_Dev(*instance, 0, pp::Context3D_Dev(), NULL);
+    if (context_.is_null()) {
+      glSetCurrentContextPPAPI(0);
+      return false;
+    }
+    surface_ = pp::Surface3D_Dev(*instance, 0, NULL);
+    context_.BindSurfaces(surface_, surface_);
+    instance->BindGraphics(surface_);
+  }
+  glSetCurrentContextPPAPI(context_.pp_resource());
+  return true;
+}
+
+void OpenGLContext::InvalidateContext(pp::Instance* instance) {
+  if (instance == NULL)
+    return;
+  // Unbind the existing surface and re-bind to null surfaces.
+  instance->BindGraphics(pp::Surface3D_Dev());
+  context_.BindSurfaces(pp::Surface3D_Dev(), pp::Surface3D_Dev());
+  glSetCurrentContextPPAPI(0);
+}
+
+void OpenGLContext::FlushContext() {
+  if (flush_pending()) {
+    // A flush is pending so do nothing; just drop this flush on the floor.
+    return;
+  }
+  set_flush_pending(true);
+  surface_.SwapBuffers(pp::CompletionCallback(&FlushCallback, this));
+}
+}  // namespace tumbler
+

Demos/NativeClient/opengl_context.h

@@ -0,0 +1,90 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_
+#define EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_
+
+///
+/// @file
+/// OpenGLContext manages the OpenGL context in the browser that is associated
+/// with a @a pp::Instance instance.
+///
+
+#include <pthread.h>
+
+#include <algorithm>
+#include <string>
+
+#include "opengl_context_ptrs.h"
+#include "ppapi/c/dev/ppb_opengles_dev.h"
+#include "ppapi/cpp/dev/context_3d_dev.h"
+#include "ppapi/cpp/dev/graphics_3d_client_dev.h"
+#include "ppapi/cpp/dev/graphics_3d_dev.h"
+#include "ppapi/cpp/dev/surface_3d_dev.h"
+#include "ppapi/cpp/instance.h"
+
+namespace tumbler {
+
+/// OpenGLContext manages an OpenGL rendering context in the browser.
+///
+class OpenGLContext : public pp::Graphics3DClient_Dev {
+ public:
+  explicit OpenGLContext(pp::Instance* instance);
+
+  /// Release all the in-browser resources used by this context, and make this
+  /// context invalid.
+  virtual ~OpenGLContext();
+
+  /// The Graphics3DClient interfcace.
+  virtual void Graphics3DContextLost() {
+    assert(!"Unexpectedly lost graphics context");
+  }
+
+  /// Make @a this the current 3D context in @a instance.
+  /// @param instance The instance of the NaCl module that will receive the
+  ///                 the current 3D context.
+  /// @return success.
+  bool MakeContextCurrent(pp::Instance* instance);
+
+  /// Flush the contents of this context to the browser's 3D device.
+  void FlushContext();
+
+  /// Make the underlying 3D device invalid, so that any subsequent rendering
+  /// commands will have no effect.  The next call to MakeContextCurrent() will
+  /// cause the underlying 3D device to get rebound and start receiving
+  /// receiving rendering commands again.  Use InvalidateContext(), for
+  /// example, when resizing the context's viewing area.
+  void InvalidateContext(pp::Instance* instance);
+
+  /// The OpenGL ES 2.0 interface.
+  const struct PPB_OpenGLES2_Dev* gles2() const {
+    return gles2_interface_;
+  }
+
+  /// The PP_Resource needed to make GLES2 calls through the Pepper interface.
+  const PP_Resource gl_context() const {
+    return context_.pp_resource();
+  }
+
+  /// Indicate whether a flush is pending.  This can only be called from the
+  /// main thread; it is not thread safe.
+  bool flush_pending() const {
+    return flush_pending_;
+  }
+  void set_flush_pending(bool flag) {
+    flush_pending_ = flag;
+  }
+
+ private:
+  pp::Context3D_Dev context_;
+  pp::Surface3D_Dev surface_;
+  bool flush_pending_;
+
+  const struct PPB_OpenGLES2_Dev* gles2_interface_;
+};
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_OPENGL_CONTEXT_H_
+

Demos/NativeClient/opengl_context_ptrs.h

@@ -0,0 +1,22 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_OPENGL_CONTEXT_PTRS_H_
+#define EXAMPLES_TUMBLER_OPENGL_CONTEXT_PTRS_H_
+
+// A convenience wrapper for a shared OpenGLContext pointer type.  As other
+// smart pointer types are needed, add them here.
+
+#include <tr1/memory>
+
+namespace tumbler {
+
+class OpenGLContext;
+
+typedef std::tr1::shared_ptr<OpenGLContext> SharedOpenGLContext;
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_OPENGL_CONTEXT_PTRS_H_
+

Demos/NativeClient/premake4.lua

@@ -0,0 +1,27 @@
+	project "NativeClientTumbler"
+		
+	kind "ConsoleApp"
+	
+	targetdir "bin_html"
+	
+	 includedirs { "."	}
+	 
+	--libdirs {}
+
+	links {
+		"ppapi_gles2",
+		"ppapi",
+		"ppapi_cpp",
+		"ppruntime"
+	}
+	
+	
+	files {
+				"cube.cc",
+        "opengl_context.cc",
+        "scripting_bridge.cc",
+        "shader_util.cc",
+        "transforms.cc",
+        "tumbler.cc",
+        "tumbler_module.cc"
+	}

Demos/NativeClient/scripting_bridge.cc

@@ -0,0 +1,95 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "scripting_bridge.h"
+
+namespace {
+const char* const kWhiteSpaceCharacters = " \t";
+
+// Helper function to pull out the next token in |token_string|.  A token is
+// delimited by whitespace.  Scanning begins at |*pos|, if pos goes beyond the
+// end of |token_string|, it is set to std::string::npos and an empty string
+// is returned.  On return, |*pos| will point to the beginning of the next
+// token. |pos| must not be NULL.
+const std::string ScanToken(const std::string& token_string, size_t* pos) {
+  std::string token;
+  if (*pos == std::string::npos) {
+    return token;
+  }
+  size_t token_start_pos = token_string.find_first_not_of(kWhiteSpaceCharacters,
+                                                          *pos);
+  size_t token_end_pos = token_string.find_first_of(kWhiteSpaceCharacters,
+                                                    token_start_pos);
+  if (token_start_pos != std::string::npos) {
+    token = token_string.substr(token_start_pos, token_end_pos);
+  }
+  *pos = token_end_pos;
+  return token;
+}
+
+// Take a string of the form 'name:value' and split it into two strings, one
+// containing 'name' and the other 'value'.  If the ':' separator is missing,
+// or is the last character in |parameter|, |parameter| is copied to
+// |param_name|, |param_value| is left unchanged and false is returned.
+bool ParseParameter(const std::string& parameter,
+                    std::string* param_name,
+                    std::string* param_value) {
+  bool success = false;
+  size_t sep_pos = parameter.find_first_of(':');
+  if (sep_pos != std::string::npos) {
+    *param_name = parameter.substr(0, sep_pos);
+    if (sep_pos < parameter.length() - 1) {
+      *param_value = parameter.substr(sep_pos + 1);
+      success = true;
+    } else {
+      success = false;
+    }
+  } else {
+    *param_name = parameter;
+    success = false;
+  }
+  return success;
+}
+}  // namespace
+
+namespace tumbler {
+
+bool ScriptingBridge::AddMethodNamed(const std::string& method_name,
+                                     SharedMethodCallbackExecutor method) {
+  if (method_name.size() == 0 || method == NULL)
+    return false;
+  method_dictionary_.insert(
+      std::pair<std::string, SharedMethodCallbackExecutor>(method_name,
+                                                           method));
+  return true;
+}
+
+bool ScriptingBridge::InvokeMethod(const std::string& method) {
+  size_t current_pos = 0;
+  const std::string method_name = ScanToken(method, &current_pos);
+  MethodDictionary::iterator method_iter;
+  method_iter = method_dictionary_.find(method_name);
+  if (method_iter != method_dictionary_.end()) {
+    // Pull out the method parameters and build a dictionary that maps
+    // parameter names to values.
+    std::map<std::string, std::string> param_dict;
+    while (current_pos != std::string::npos) {
+      const std::string parameter = ScanToken(method, &current_pos);
+      if (parameter.length()) {
+        std::string param_name;
+        std::string param_value;
+        if (ParseParameter(parameter, &param_name, &param_value)) {
+          // Note that duplicate parameter names will override each other.  The
+          // last one in the method string will be used.
+          param_dict[param_name] = param_value;
+        }
+      }
+    }
+    (*method_iter->second).Execute(*this, param_dict);
+    return true;
+  }
+  return false;
+}
+
+}  // namespace tumbler

Demos/NativeClient/scripting_bridge.h

@@ -0,0 +1,52 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_SCRIPTING_BRIDGE_H_
+#define EXAMPLES_TUMBLER_SCRIPTING_BRIDGE_H_
+
+#include <map>
+#include <string>
+#include <tr1/memory>
+#include <vector>
+
+#include "callback.h"
+#include "ppapi/cpp/var.h"
+
+namespace tumbler {
+
+class MethodCallbackExecutor;
+
+// This class handles the interface between the browser and the NaCl module.
+// There is a single point of entry from the browser: postMessage().  The
+// string passed to postMessage() has this format:
+//     'function_name arg_name0:arg_0 arg_name1:arg1 ...'
+// The arguments have undetermined type; they are placed in a map of argument
+// names and values.  Values are all strings, it is up to the target code to
+// do any type coercion.
+// Methods called by the scripting bridge must have a signature like this:
+//     void Method(const ScriptingBridge& bridge,
+//                 const ParameterDictionary&);
+class ScriptingBridge {
+ public:
+  // Shared pointer type used in the method map.
+  typedef std::tr1::shared_ptr<MethodCallbackExecutor>
+      SharedMethodCallbackExecutor;
+
+  virtual ~ScriptingBridge() {}
+
+  // Causes |method_name| to be published as a method that can be called via
+  // postMessage() from the browser.  Associates this method with |method|.
+  bool AddMethodNamed(const std::string& method_name,
+                      SharedMethodCallbackExecutor method);
+
+  bool InvokeMethod(const std::string& method);
+
+ private:
+  typedef std::map<std::string, SharedMethodCallbackExecutor> MethodDictionary;
+
+  MethodDictionary method_dictionary_;
+};
+
+}  // namespace tumbler
+#endif  // EXAMPLES_TUMBLER_SCRIPTING_BRIDGE_H_

Demos/NativeClient/shader_util.cc

@@ -0,0 +1,95 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "shader_util.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+namespace shader_util {
+
+GLuint CreateShaderOfType(GLenum type, const char *shader_src) {
+  GLuint shader;
+  GLint compiled;
+
+  // Create the shader object
+  shader = glCreateShader(type);
+
+  if (shader == 0)
+    return 0;
+
+  // Load and compile the shader source
+  glShaderSource(shader, 1, &shader_src, NULL);
+  glCompileShader(shader);
+
+  // Check the compile status
+  glGetShaderiv(shader, GL_COMPILE_STATUS, &compiled);
+  if (compiled == 0) {
+    GLint info_len = 0;
+    glGetShaderiv(shader, GL_INFO_LOG_LENGTH, &info_len);
+    if (info_len > 1) {
+      char* info_log = reinterpret_cast<char*>(malloc(sizeof(char) * info_len));
+      glGetShaderInfoLog(shader, info_len, NULL, info_log);
+      // TODO(dspringer): We could really use a logging API.
+      printf("Error compiling shader:\n%s\n", info_log);
+      free(info_log);
+    }
+    glDeleteShader(shader);
+    return 0;
+  }
+
+  return shader;
+}
+
+GLuint CreateProgramFromVertexAndFragmentShaders(
+    const char *vertex_shader_src, const char *fragment_shader_src) {
+  GLuint vertex_shader;
+  GLuint fragment_shader;
+  GLuint program_object;
+  GLint linked;
+
+  // Load the vertex/fragment shaders
+  vertex_shader = CreateShaderOfType(GL_VERTEX_SHADER, vertex_shader_src);
+  if (vertex_shader == 0)
+    return 0;
+  fragment_shader = CreateShaderOfType(GL_FRAGMENT_SHADER, fragment_shader_src);
+  if (fragment_shader == 0) {
+    glDeleteShader(vertex_shader);
+    return 0;
+  }
+
+  // Create the program object and attach the shaders.
+  program_object = glCreateProgram();
+  if (program_object == 0)
+    return 0;
+  glAttachShader(program_object, vertex_shader);
+  glAttachShader(program_object, fragment_shader);
+
+  // Link the program
+  glLinkProgram(program_object);
+
+  // Check the link status
+  glGetProgramiv(program_object, GL_LINK_STATUS, &linked);
+  if (linked == 0) {
+    GLint info_len = 0;
+    glGetProgramiv(program_object, GL_INFO_LOG_LENGTH, &info_len);
+    if (info_len > 1) {
+      char* info_log = reinterpret_cast<char*>(malloc(info_len));
+      glGetProgramInfoLog(program_object, info_len, NULL, info_log);
+      // TODO(dspringer): We could really use a logging API.
+      printf("Error linking program:\n%s\n", info_log);
+      free(info_log);
+    }
+    glDeleteProgram(program_object);
+    return 0;
+  }
+
+  // Delete these here because they are attached to the program object.
+  glDeleteShader(vertex_shader);
+  glDeleteShader(fragment_shader);
+
+  return program_object;
+}
+
+}  // namespace shader_util

Demos/NativeClient/shader_util.h

@@ -0,0 +1,29 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Some simple helper functions that load shaders and create program objects.
+
+#ifndef EXAMPLES_TUMBLER_SHADER_UTIL_H_
+#define EXAMPLES_TUMBLER_SHADER_UTIL_H_
+
+#include <GLES2/gl2.h>
+
+namespace shader_util {
+
+// Load and compile a shader.  |type| can be one of GL_VERTEX_SHADER or
+// GL_FRAGMENT_SHADER.  Returns a non-0 value representing the compiled
+// shader on success, 0 on failure.  The caller is responsible for deleting
+// the returned shader using glDeleteShader().
+GLuint CreateShaderOfType(GLenum type, const char *shader_src);
+
+// Load and compile the vertex and fragment shaders, then link these together
+// into a complete program.  Returns a non-0 value representing the program on,
+// success or 0 on failure.  The caller is responsible for deleting the
+// returned program using glDeleteProgram().
+GLuint CreateProgramFromVertexAndFragmentShaders(
+    const char *vertex_shader_src, const char *fragment_shader_src);
+
+}  // namespace shader_util
+
+#endif  // EXAMPLES_TUMBLER_SHADER_UTIL_H_

Demos/NativeClient/transforms.cc

@@ -0,0 +1,116 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "transforms.h"
+
+#include <math.h>
+#include <string.h>
+#include <GLES2/gl2.h>
+
+namespace transform_4x4 {
+
+static const GLfloat kPI = 3.1415926535897932384626433832795f;
+
+void Translate(GLfloat* m, GLfloat tx, GLfloat ty, GLfloat tz) {
+  m[12] += (m[0] * tx + m[4] * ty + m[8] * tz);
+  m[13] += (m[1] * tx + m[5] * ty + m[9] * tz);
+  m[14] += (m[2] * tx + m[6] * ty + m[10] * tz);
+  m[15] += (m[3] * tx + m[7] * ty + m[11] * tz);
+}
+
+void Frustum(GLfloat* m,
+             GLfloat left,
+             GLfloat right,
+             GLfloat bottom,
+             GLfloat top,
+             GLfloat near_z,
+             GLfloat far_z) {
+  GLfloat delta_x = right - left;
+  GLfloat delta_y = top - bottom;
+  GLfloat delta_z = far_z - near_z;
+  GLfloat frustum[16];
+
+  if ((near_z <= 0.0f) || (far_z <= 0.0f) ||
+     (delta_x <= 0.0f) || (delta_y <= 0.0f) || (delta_z <= 0.0f))
+     return;
+
+  frustum[0] = 2.0f * near_z / delta_x;
+  frustum[1] = frustum[2] = frustum[3] = 0.0f;
+
+  frustum[5] = 2.0f * near_z / delta_y;
+  frustum[4] = frustum[6] = frustum[7] = 0.0f;
+
+  frustum[8] = (right + left) / delta_x;
+  frustum[9] = (top + bottom) / delta_y;
+  frustum[10] = -(near_z + far_z) / delta_z;
+  frustum[11] = -1.0f;
+
+  frustum[14] = -2.0f * near_z * far_z / delta_z;
+  frustum[12] = frustum[13] = frustum[15] = 0.0f;
+
+  transform_4x4::Multiply(m, frustum, m);
+}
+
+
+void Perspective(GLfloat* m,
+                 GLfloat fovy,
+                 GLfloat aspect,
+                 GLfloat near_z,
+                 GLfloat far_z) {
+  GLfloat frustum_w, frustum_h;
+
+  frustum_h = tanf((fovy * 0.5f) / 180.0f * kPI) * near_z;
+  frustum_w = frustum_h * aspect;
+  transform_4x4::Frustum(m, -frustum_w, frustum_w, -frustum_h, frustum_h,
+                         near_z, far_z);
+}
+
+void Multiply(GLfloat *m, GLfloat *a, GLfloat* b) {
+  GLfloat tmp[16];
+  // tmp = a . b
+  GLfloat a0, a1, a2, a3;
+  a0 = a[0];
+  a1 = a[1];
+  a2 = a[2];
+  a3 = a[3];
+  tmp[0] = a0 * b[0] + a1 * b[4] + a2 * b[8] + a3 * b[12];
+  tmp[1] = a0 * b[1] + a1 * b[5] + a2 * b[9] + a3 * b[13];
+  tmp[2] = a0 * b[2] + a1 * b[6] + a2 * b[10] + a3 * b[14];
+  tmp[3] = a0 * b[3] + a1 * b[7] + a2 * b[11] + a3 * b[15];
+
+  a0 = a[4];
+  a1 = a[5];
+  a2 = a[6];
+  a3 = a[7];
+  tmp[4] = a0 * b[0] + a1 * b[4] + a2 * b[8] + a3 * b[12];
+  tmp[5] = a0 * b[1] + a1 * b[5] + a2 * b[9] + a3 * b[13];
+  tmp[6] = a0 * b[2] + a1 * b[6] + a2 * b[10] + a3 * b[14];
+  tmp[7] = a0 * b[3] + a1 * b[7] + a2 * b[11] + a3 * b[15];
+
+  a0 = a[8];
+  a1 = a[9];
+  a2 = a[10];
+  a3 = a[11];
+  tmp[8] = a0 * b[0] + a1 * b[4] + a2 * b[8] + a3 * b[12];
+  tmp[9] = a0 * b[1] + a1 * b[5] + a2 * b[9] + a3 * b[13];
+  tmp[10] = a0 * b[2] + a1 * b[6] + a2 * b[10] + a3 * b[14];
+  tmp[11] = a0 * b[3] + a1 * b[7] + a2 * b[11] + a3 * b[15];
+
+  a0 = a[12];
+  a1 = a[13];
+  a2 = a[14];
+  a3 = a[15];
+  tmp[12] = a0 * b[0] + a1 * b[4] + a2 * b[8] + a3 * b[12];
+  tmp[13] = a0 * b[1] + a1 * b[5] + a2 * b[9] + a3 * b[13];
+  tmp[14] = a0 * b[2] + a1 * b[6] + a2 * b[10] + a3 * b[14];
+  tmp[15] = a0 * b[3] + a1 * b[7] + a2 * b[11] + a3 * b[15];
+  memcpy(m, tmp, sizeof(GLfloat) * 4 * 4);
+}
+
+void LoadIdentity(GLfloat* m) {
+  memset(m, 0, sizeof(GLfloat) * 4 * 4);
+  m[0] = m[5] = m[10] = m[15] = 1.0f;
+}
+
+}  // namespace transform_4x4

Demos/NativeClient/transforms.h

@@ -0,0 +1,45 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_TRANSFORMS_H_
+#define EXAMPLES_TUMBLER_TRANSFORMS_H_
+
+#include <GLES2/gl2.h>
+
+// A very simple set of 4x4 matrix routines.  In all these routines, the input
+// matrix is assumed to be a 4x4 of GLfloats.
+
+namespace transform_4x4 {
+
+// Pre-multply |m| with a projection transformation 4x4 matrix from a
+// truncated pyramid viewing frustum.
+void Frustum(GLfloat* m,
+             GLfloat left,
+             GLfloat right,
+             GLfloat bottom,
+             GLfloat top,
+             GLfloat near_z,
+             GLfloat far_z);
+
+// Replace |m| with the 4x4 identity matrix.
+void LoadIdentity(GLfloat* m);
+
+// |m| <- |a| . |b|.  |m| can point at the same memory as either |a| or |b|.
+void Multiply(GLfloat *m, GLfloat *a, GLfloat* b);
+
+// Pre-multiply |m| with a single-point perspective matrix based on the viewing
+// frustum whose view angle is |fovy|.
+void Perspective(GLfloat* m,
+                 GLfloat fovy,
+                 GLfloat aspect,
+                 GLfloat near_z,
+                 GLfloat far_z);
+
+// Pre-multiply |m| with a matrix that represents a translation by |tx|, |ty|,
+// |tz|.
+void Translate(GLfloat* m, GLfloat tx, GLfloat ty, GLfloat tz);
+}  // namespace transform_4x4
+
+#endif  // EXAMPLES_TUMBLER_TRANSFORMS_H_
+

Demos/NativeClient/tumbler.cc

@@ -0,0 +1,136 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tumbler.h"
+
+#include <cstdlib>
+#include <cstring>
+#include <string>
+#include <vector>
+
+#include "cube.h"
+#include "opengl_context.h"
+#include "scripting_bridge.h"
+#include "ppapi/cpp/rect.h"
+#include "ppapi/cpp/size.h"
+#include "ppapi/cpp/var.h"
+
+namespace {
+const size_t kQuaternionElementCount = 4;
+const char* const kArrayStartCharacter = "[";
+const char* const kArrayEndCharacter = "]";
+const char* const kArrayDelimiter = ",";
+
+// Return the value of parameter named |param_name| from |parameters|.  If
+// |param_name| doesn't exist, then return an empty string.
+std::string GetParameterNamed(
+    const std::string& param_name,
+    const tumbler::MethodParameter& parameters) {
+  tumbler::MethodParameter::const_iterator i =
+      parameters.find(param_name);
+  if (i == parameters.end()) {
+    return "";
+  }
+  return i->second;
+}
+
+// Convert the JSON string |array| into a vector of floats.  |array| is
+// expected to be a string bounded by '[' and ']', and a comma-delimited list
+// of numbers.  Any errors result in the return of an empty array.
+std::vector<float> CreateArrayFromJSON(const std::string& json_array) {
+  std::vector<float> float_array;
+  size_t array_start_pos = json_array.find_first_of(kArrayStartCharacter);
+  size_t array_end_pos = json_array.find_last_of(kArrayEndCharacter);
+  if (array_start_pos == std::string::npos ||
+      array_end_pos == std::string::npos)
+    return float_array;  // Malformed JSON: missing '[' or ']'.
+  // Pull out the array elements.
+  size_t token_pos = array_start_pos + 1;
+  while (token_pos < array_end_pos) {
+    float_array.push_back(strtof(json_array.data() + token_pos, NULL));
+    size_t delim_pos = json_array.find_first_of(kArrayDelimiter, token_pos);
+    if (delim_pos == std::string::npos)
+      break;
+    token_pos = delim_pos + 1;
+  }
+  return float_array;
+}
+}  // namespace
+
+namespace tumbler {
+
+Tumbler::Tumbler(PP_Instance instance)
+    : pp::Instance(instance),
+      cube_(NULL) {
+}
+
+Tumbler::~Tumbler() {
+  // Destroy the cube view while GL context is current.
+  opengl_context_->MakeContextCurrent(this);
+  delete cube_;
+}
+
+bool Tumbler::Init(uint32_t /* argc */,
+                   const char* /* argn */[],
+                   const char* /* argv */[]) {
+  // Add all the methods to the scripting bridge.
+  ScriptingBridge::SharedMethodCallbackExecutor set_orientation_method(
+      new tumbler::MethodCallback<Tumbler>(
+          this, &Tumbler::SetCameraOrientation));
+  scripting_bridge_.AddMethodNamed("setCameraOrientation",
+                                    set_orientation_method);
+  return true;
+}
+
+void Tumbler::HandleMessage(const pp::Var& message) {
+  if (!message.is_string())
+    return;
+  scripting_bridge_.InvokeMethod(message.AsString());
+}
+
+void Tumbler::DidChangeView(const pp::Rect& position, const pp::Rect& clip) {
+  int cube_width = cube_ ? cube_->width() : 0;
+  int cube_height = cube_ ? cube_->height() : 0;
+  if (position.size().width() == cube_width &&
+      position.size().height() == cube_height)
+    return;  // Size didn't change, no need to update anything.
+
+  if (opengl_context_ == NULL)
+    opengl_context_.reset(new OpenGLContext(this));
+  opengl_context_->InvalidateContext(this);
+  if (!opengl_context_->MakeContextCurrent(this))
+    return;
+  if (cube_ == NULL) {
+    cube_ = new Cube(opengl_context_);
+    cube_->PrepareOpenGL();
+  }
+  cube_->Resize(position.size().width(), position.size().height());
+  DrawSelf();
+}
+
+void Tumbler::DrawSelf() {
+  if (cube_ == NULL || opengl_context_ == NULL)
+    return;
+  opengl_context_->MakeContextCurrent(this);
+  cube_->Draw();
+  opengl_context_->FlushContext();
+}
+
+void Tumbler::SetCameraOrientation(
+    const tumbler::ScriptingBridge& bridge,
+    const tumbler::MethodParameter& parameters) {
+  // |parameters| is expected to contain one object named "orientation", whose
+  // value is a JSON string that represents an array of four floats.
+  if (parameters.size() != 1 || cube_ == NULL)
+    return;
+  std::string orientation_desc = GetParameterNamed("orientation", parameters);
+  std::vector<float> orientation = CreateArrayFromJSON(orientation_desc);
+  if (orientation.size() != kQuaternionElementCount) {
+    return;
+  }
+  cube_->SetOrientation(orientation);
+  DrawSelf();
+}
+}  // namespace tumbler
+

Demos/NativeClient/tumbler.h

@@ -0,0 +1,64 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef EXAMPLES_TUMBLER_TUMBLER_H_
+#define EXAMPLES_TUMBLER_TUMBLER_H_
+
+#include <pthread.h>
+#include <map>
+#include <vector>
+
+#include "cube.h"
+#include "opengl_context.h"
+#include "opengl_context_ptrs.h"
+#include "scripting_bridge.h"
+#include "ppapi/cpp/instance.h"
+
+namespace tumbler {
+
+class Tumbler : public pp::Instance {
+ public:
+  explicit Tumbler(PP_Instance instance);
+
+  // The dtor makes the 3D context current before deleting the cube view, then
+  // destroys the 3D context both in the module and in the browser.
+  virtual ~Tumbler();
+
+  // Called by the browser when the NaCl module is loaded and all ready to go.
+  virtual bool Init(uint32_t argc, const char* argn[], const char* argv[]);
+
+  // Called whenever the in-browser window changes size.
+  virtual void DidChangeView(const pp::Rect& position, const pp::Rect& clip);
+
+  // Called by the browser to handle the postMessage() call in Javascript.
+  virtual void HandleMessage(const pp::Var& message);
+
+  // Bind and publish the module's methods to JavaScript.
+  void InitializeMethods(ScriptingBridge* bridge);
+
+  // Set the camera orientation to the quaternion in |args[0]|.  |args| must
+  // have length at least 1; the first element is expeted to be an Array
+  // object containing 4 floating point number elements (the quaternion).
+  // This method is bound to the JavaScript "setCameraOrientation" method and
+  // is called like this:
+  //     module.setCameraOrientation([0.0, 1.0, 0.0, 0.0]);
+  void SetCameraOrientation(
+    const tumbler::ScriptingBridge& bridge,
+    const tumbler::MethodParameter& parameters);
+
+  // Called to draw the contents of the module's browser area.
+  void DrawSelf();
+
+ private:
+  // Browser connectivity and scripting support.
+  ScriptingBridge scripting_bridge_;
+
+  SharedOpenGLContext opengl_context_;
+  // Wouldn't it be awesome if we had boost::scoped_ptr<>?
+  Cube* cube_;
+};
+
+}  // namespace tumbler
+
+#endif  // EXAMPLES_TUMBLER_TUMBLER_H_

Demos/NativeClient/tumbler_module.cc

@@ -0,0 +1,45 @@
+// Copyright (c) 2011 The Native Client Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tumbler.h"
+#include "ppapi/cpp/instance.h"
+#include "ppapi/cpp/module.h"
+#include "ppapi/gles2/gl2ext_ppapi.h"
+
+/// The Module class.  The browser calls the CreateInstance() method to create
+/// an instance of your NaCl module on the web page.  The browser creates a new
+/// instance for each <embed> tag with type="application/x-nacl".
+class TumberModule : public pp::Module {
+ public:
+  TumberModule() : pp::Module() {}
+  virtual ~TumberModule() {
+    glTerminatePPAPI();
+  }
+
+  /// Called by the browser when the module is first loaded and ready to run.
+  /// This is called once per module, not once per instance of the module on
+  /// the page.
+  virtual bool Init() {
+    return glInitializePPAPI(get_browser_interface()) == GL_TRUE;
+  }
+
+  /// Create and return a Tumbler instance object.
+  /// @param[in] instance The browser-side instance.
+  /// @return the plugin-side instance.
+  virtual pp::Instance* CreateInstance(PP_Instance instance) {
+    return new tumbler::Tumbler(instance);
+  }
+};
+
+namespace pp {
+/// Factory function called by the browser when the module is first loaded.
+/// The browser keeps a singleton of this module.  It calls the
+/// CreateInstance() method on the object you return to make instances.  There
+/// is one instance per <embed> tag on the page.  This is the main binding
+/// point for your NaCl module with the browser.
+Module* CreateModule() {
+  return new TumberModule();
+}
+}  // namespace pp
+

msvc/nacl.sh

@@ -0,0 +1,15 @@
+
+echo Only tested using a Cygwin Bash Shell with make.exe available
+
+export AR=/cygdrive/f/sdks/native_client_sdk_0_5_984/toolchain/win_x86/bin/nacl-ar.exe
+export CC=/cygdrive/f/sdks/native_client_sdk_0_5_984/toolchain/win_x86/bin/nacl-gcc.exe
+export CXX=/cygdrive/f/sdks/native_client_sdk_0_5_984/toolchain/win_x86/bin/nacl-g++.exe
+
+./premake4 --with-nacl gmake
+cd gmake
+export config=release32
+make
+
+export config=release64
+make
+

msvc/premake4.lua

@@ -63,15 +63,18 @@ end
 		include "../src/BulletMultiThreaded/GpuSoftBodySolvers/DX11"
 	end
 
+
+  
 	if not _OPTIONS["with-dx11"] and not _OPTIONS["with-nacl"] then
 		include "../Demos"
   	include "../Extras"
   end
   
+   if _OPTIONS["with-nacl"] then
+  	include "../Demos/NativeClient"
+  else
   	include "../src/LinearMath"	
 		include "../src/BulletCollision"	
 		include "../src/BulletDynamics"	
 		include "../src/BulletSoftBody"	
-	
-
-
+	end