43 lines
3.1 KiB
HTML
43 lines
3.1 KiB
HTML
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<html>
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<head>
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</head>
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<body>
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<article id="video-notes">
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<h1><!-- __CINERA_TITLE__ --></h1>
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<h3 id="input-cleanup-and-fixes">Input Cleanup and Fixes</h3>
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<p>This episode starts with some cleanup and fixes to the input handling code from yesterday.</p>
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<ul>
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<li>Windows API often uses a <code>0</code> return value to indicate success. Our stubs probably shouldn't return <code>0</code>.</li>
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<li>Windows 8 ships with <code>xinput1_4.dll</code> only. So we need to try each version in turn</li>
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<li>When you handle WM_SYSKEY* messages, you lose built in Alt-F4 functionality, and have to reimplement it.</li>
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</ul>
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<h3 id="sound-programming-for-games">Sound Programming for Games</h3>
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<p>Casey starts with a high level overview of sound programing for games. The key ideas here are that we are allocating
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a <a href="http://en.wikipedia.org/wiki/Circular_buffer">circular buffer</a> for sound, and the system will play it continually
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on a loop. If you haven't worked with circular buffers (or ring buffers) before, much of this code will be confusing.
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It's worth taking some time to familiarize yourself with them.</p>
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<p>Resources:</p>
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<ul>
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<li><a href="http://c.learncodethehardway.org/book/ex44.html">Ring Buffers</a> on "Learn C The Hard Way"</li>
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</ul>
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<h3 id="working-with-directsound">Working with DirectSound</h3>
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<p>The basic process for initializing DirectSound is as follows:</p>
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<ol>
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<li>Load the Library - <a href="http://msdn.microsoft.com/en-us/library/ms684175.aspx"><code>LoadLibrary</code></a><code>("dsound.dll")</code></li>
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<li>Create a DirectSound object - <a href="http://msdn.microsoft.com/en-us/library/microsoft.directx_sdk.reference.directsoundcreate8.aspx"><code>DirectSoundCreate()</code></a></li>
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<li>Set the Cooperative Level - <a href="http://msdn.microsoft.com/en-us/library/microsoft.directx_sdk.idirectsound8.idirectsound8.setcooperativelevel.aspx"><code>IDirectSound8::SetCooperativeLevel()</code></a></li>
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<li>"Create" a primary buffer - <a href="http://msdn.microsoft.com/en-us/library/microsoft.directx_sdk.idirectsound8.idirectsound8.createsoundbuffer.aspx"><code>IDirectSound8::CreateSoundBuffer()</code></a></li>
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<li>Create a secondary buffer</li>
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<li>Tell DirectSound to start playing the secondary buffer - <a href="http://msdn.microsoft.com/en-us/library/microsoft.directx_sdk.idirectsoundbuffer8.idirectsoundbuffer8.play.aspx"><code>IDirectSoundBuffer8::Play()</code></a></li>
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</ol>
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<p>In the next episode we will look closely at how to fill this buffer and implement it in the game loop.</p>
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</article>
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</body>
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</html>
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