Revising cds2014 samples based on first round of feedback.

native_client_sdk/doc_generated/cds2014/cpp.html

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 <section id="a-saga-of-fire-and-water-codelab">
 <span id="cds2014-cpp"></span><h1 id="a-saga-of-fire-and-water-codelab"><span id="cds2014-cpp"></span>A Saga of Fire and Water - Codelab</h1>
 <h2 id="introduction">Introduction</h2>
 <p>Learn the basics of using PPAPI to do 2D graphics from
 a C++ program running in Native Client.
 Modify our sample to turn fire into water.
 Develop inside Google Chrome, using our NaCl Development Environment
 Chrome App.
@@ skipping 186 matching lines @@
 on the integral role fire played in its campus life.</p>
 <h2 id="water">Water</h2>
 <p>Remarkably, not everyone enjoys the primal illusion of fire.</p>
 <p>Your task in this codelab is to transform the rising fire
 effect you see before you, into a beautiful, tranquil waterfall.
 This will require digging into some C++ code.</p>
 <p>Before you begin, you&#8217;ll want to copy our fire program to a new name,
 since you might decide later that you like fire better, I know I do:</p>
 <pre class="prettyprint">
 cp fire.cc water.cc
+git add water.cc
+git commit -am &quot;adding water&quot;
 </pre>
 <p>For this codelab, you&#8217;ll only need to change <cite>water.cc</cite>.</p>
 <p>The task of turning fire into water involves two key challenges:</p>
 <blockquote>
 <div><ul class="small-gap">
 <li>Alter the red-yellow palette of fire into a blue-green one.</li>
 <li>Reverse upward rising flame into downward falling water.</li>
 <li>Seed the waterfall from the top instead of the bottom.</li>
 </ul>
 </div></blockquote>
 <p>At this point you&#8217;ll want to open up <cite>water.cc</cite> in the editor you
 picked earlier.</p>
 <h3 id="i-see-a-red-door-and-i-want-it-painted-blue">I see a red door and I want it painted... blue</h3>
 <p>While PPAPI&#8217;s 2D graphics API uses multi-component RGB pixels,
 our flame effect is actually monochrome. A single intensity
 value is used in the flame simulation. This is then converted
 to color based on a multi-color gradient.
 To alter the color-scheme, locate this palette, and exchange
-the red component for blue.</p>
+the red component (first) with blue (third).</p>
 <p>Hint: Focus your energies on the CreatePalette function.</p>
 <p>You can test you changes at any time with:</p>
 <pre class="prettyprint">
 make water
 </pre>
 <h3 id="what-goes-up">What goes up...</h3>
 <p>Now there&#8217;s the small matter of gravity.
 While smoke, and well flame, rises, we want our water to go down.</p>
 <p>The simulation of fire loops over each pixel,
 bottom row to top row,
 diffusing &#8220;fire stuff&#8221; behind the sweep.
-You&#8217;ll want to reverse this.
-Note the simulation buffer is stored in <a href="http://en.wikipedia.org/wiki/Row-major_order"
- target="_blank">Row-major order</a> from bottom to top.
-Accesses of + width and - width are used to reach rows above and below
-the current line.</p>
+You&#8217;ll want to reverse this.</p>
 <p>Hint: You&#8217;ll need to change the y loop direction in the UpdateFlames function.</p>
 <h3 id="up-high-down-low">Up high, down low</h3>
 <p>While you can now use the mouse to inject a trickle of water.
 The small line of blue at the bottom isn&#8217;t much of a waterfall.
 Move it to the top to complete the effect.</p>
 <p>Hint: You&#8217;ll want to change the area that the UpdateCoals function mutates.</p>
 <h2 id="what-you-ve-learned">What you&#8217;ve learned</h2>
 <p>In addition to learning a new appreciation for fire, you&#8217;ve also made water...
 And while dusting off your C/C++ image manipulation skills,
 you&#8217;ve discovered how easy it is to modify, build,
@@ skipping 11 matching lines @@
 and bring an awesome C/C++ application to NaCl or PNaCl today!</p>
 <h2 id="cleanup">Cleanup</h2>
 <p>The Chrome Dev Environment App installs &gt;800MB into
 HTML5 Filesystem storage on your device.
 To recover this storage, uninstall the app from the
 <a href="https://chrome.google.com/webstore"
  target="_blank">Chrome Web Store</a>.</p>
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