42 lines
8.8 KiB
HTML
42 lines
8.8 KiB
HTML
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>The Be Book - System Overview - The Game Kit</title><link rel="stylesheet" href="be_book.css" type="text/css" media="all" /><link rel="shortcut icon" type="image/vnd.microsoft.icon" href="./images/favicon.ico" /><!--[if IE]>
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<link rel="stylesheet" type="text/css" href="be_book_ie.css" />
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<![endif]--><meta name="generator" content="DocBook XSL Stylesheets V1.73.2" /><meta name="keywords" content="Access, BeOS, BeBook, API" /><link rel="start" href="index.html" title="The Be Book" /><link rel="up" href="TheGameKit_Overview.html" title="The Game Kit" /><link rel="prev" href="TheGameKit_Overview.html" title="The Game Kit" /><link rel="next" href="BDirectWindow_Overview.html" title="BDirectWindow" /></head><body><div id="header"><div id="headerT"><div id="headerTL"><a accesskey="p" href="TheGameKit_Overview.html" title="The Game Kit"><img src="./images/navigation/prev.png" alt="Prev" /></a> <a accesskey="u" href="TheGameKit_Overview.html" title="The Game Kit"><img src="./images/navigation/up.png" alt="Up" /></a> <a accesskey="n" href="BDirectWindow_Overview.html" title="BDirectWindow"><img src="./images/navigation/next.png" alt="Next" /></a></div><div id="headerTR"><div id="navigpeople"><a href="http://www.haiku-os.org"><img src="./images/People_24.png" alt="haiku-os.org" title="Visit The Haiku Website" /></a></div><div class="navighome" title="Home"><a accesskey="h" href="index.html"><img src="./images/navigation/home.png" alt="Home" /></a></div><div class="navigboxed" id="navigindex"><a accesskey="i" href="ClassIndex.html" title="Index">I</a></div><div class="navigboxed" id="naviglang" title="English">en</div></div><div id="headerTC">The Be Book - System Overview - The Game Kit</div></div><div id="headerB">Prev: <a href="TheGameKit_Overview.html">The Game Kit</a> Up: <a href="TheGameKit_Overview.html">The Game Kit</a> Next: <a href="BDirectWindow_Overview.html">BDirectWindow</a></div><hr /></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><div xmlns:d="http://docbook.org/ns/docbook"><h2 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="TheGameKit_Overview_Introduction"></a>Introduction</h2></div></div></div><p>The Game Kit provides features that game developers will find
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particularly useful:</p><p>There are two types of functionality provided by the Game Kit:</p><ul class="itemizedlist"><li><p>Low-level graphics access</p></li><li><p>High-performance and convenient sound playback</p></li></ul><p>There's also one global function,
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<a class="link" href="TheGameKit_Functions.html#set_mouse_position" title="set_mouse_position()"><code class="function">set_mouse_position()</code></a>,
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which lets you move the mouse cursor programatically.</p><p>Although designed with games in mind, nothing in the Game Kit is
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restricted to game applications, except that the user will have to
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deposit another 50 cents every three minutes.</p><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><hr /><div xmlns:d="http://docbook.org/ns/docbook"><h3 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="TheGameKit_Overview_Low_Level_Graphics"></a>Low-Level Graphics Access</h3></div></div></div><p>There are two classes provided for direct access to the underlying
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graphics hardware:
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<a class="link" href="BWindowScreen.html" title="BWindowScreen"><code class="classname">BWindowScreen</code></a> and
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<a class="link" href="BDirectWindow.html" title="BDirectWindow"><code class="classname">BDirectWindow</code></a>. These two classes
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both give you direct access to the graphics card's frame buffer; the
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difference between them is that
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<a class="link" href="BWindowScreen.html" title="BWindowScreen"><code class="classname">BWindowScreen</code></a>
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always takes over the entire screen, bypassing the Application Server, while
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<a class="link" href="BDirectWindow.html" title="BDirectWindow"><code class="classname">BDirectWindow</code></a> can
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draw in a window on most graphics hardware.</p><p>Although <a class="link" href="BDirectWindow.html" title="BDirectWindow"><code class="classname">BDirectWindow</code></a>
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can do everything
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<a class="link" href="BWindowScreen.html" title="BWindowScreen"><code class="classname">BWindowScreen</code></a>
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can do,
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<a class="link" href="BWindowScreen.html" title="BWindowScreen"><code class="classname">BWindowScreen</code></a>
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can be a little easier to use.</p></div><div class="section"><div xmlns="" xmlns:d="http://docbook.org/ns/docbook" class="titlepage"><div><hr /><div xmlns:d="http://docbook.org/ns/docbook"><h3 xmlns="http://www.w3.org/1999/xhtml" class="title"><a id="TheGameKit_Overview_High_Performance_Audio"></a>High-Performance Audio</h3></div></div></div><p>Several classes are provided for high-performance audio playback:</p><dl class="variablelist"><dt><span class="term"><a class="link" href="BGameSound.html" title="BGameSound"><code class="classname">BGameSound</code></a></span></dt><dd><p>Is a base class and isn't used directly; it's the foundation
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for all the other audio classes in the Game Kit.</p></dd><dt><span class="term"><a class="link" href="BFileGameSound.html" title="BFileGameSound"><code class="classname">BFileGameSound</code></a></span></dt><dd><p>Is used to represent a sound effect stored in a disk file,
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and provides functions for playing the sound. It can be used for playing
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music loops from audio files, or for playing the occasional large sound
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effect.</p></dd><dt><span class="term"><a class="link" href="BSimpleGameSound.html" title="BSimpleGameSound"><code class="classname">BSimpleGameSound</code></a></span></dt><dd><p>On the other hand, preloads the sound into
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memory, so that it can be played back with extremely low latency and low
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overhead (at the expense of memory space).</p></dd><dt><span class="term"><a class="link" href="BPushGameSound.html" title="BPushGameSound"><code class="classname">BPushGameSound</code></a>s</span></dt><dd><p>Are used to let you fill buffers flowing to the speakers
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(or headphones, or whatever audio output device is being used). Their
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missions are the same, but their methods are different;
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<a class="link" href="BPushGameSound.html" title="BPushGameSound"><code class="classname">BPushGameSound</code></a>
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also provides a way to play sound in a cyclic loop, keeping ahead of the
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playback point in the buffer. This is the extreme in high-performance,
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low-latency audio, but does require some extra work on the programmer's
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part.</p></dd><dt><span class="term"><a class="link" href="BStreamingGameSound.html" title="BStreamingGameSound"><code class="classname">BStreamingGameSound</code></a></span></dt><dd><p>Requires magic powers to use; its functionality is
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closely tied to the implementation of the Kit, especially when hardware
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sound acceleration is involved. So don't touch it, we beg you.</p></dd></dl></div></div><div id="footer"><hr /><div id="footerT">Prev: <a href="TheGameKit_Overview.html">The Game Kit</a> Up: <a href="TheGameKit_Overview.html">The Game Kit</a> Next: <a href="BDirectWindow_Overview.html">BDirectWindow</a> </div><div id="footerB"><div id="footerBL"><a href="TheGameKit_Overview.html" title="The Game Kit"><img src="./images/navigation/prev.png" alt="Prev" /></a> <a href="TheGameKit_Overview.html" title="The Game Kit"><img src="./images/navigation/up.png" alt="Up" /></a> <a href="BDirectWindow_Overview.html" title="BDirectWindow"><img src="./images/navigation/next.png" alt="Next" /></a></div><div id="footerBR"><div><a href="http://www.haiku-os.org"><img src="./images/People_24.png" alt="haiku-os.org" title="Visit The Haiku Website" /></a></div><div class="navighome" title="Home"><a accesskey="h" href="index.html"><img src="./images/navigation/home.png" alt="Home" /></a></div></div><div id="footerBC"><a href="http://www.access-company.com/home.html" title="ACCESS Co."><img alt="Access Company" src="./images/access_logo.png" /></a></div></div></div><div id="licenseFooter"><div id="licenseFooterBL"><a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/" title="Creative Commons License"><img alt="Creative Commons License" style="border-width:0" src="https://licensebuttons.net/l/by-nc-nd/3.0/88x31.png" /></a></div><div id="licenseFooterBR"><a href="./LegalNotice.html">Legal Notice</a></div><div id="licenseFooterBC"><span id="licenseText">This work is licensed under a
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<a rel="license" href="http://creativecommons.org/licenses/by-nc-nd/3.0/">Creative
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Commons Attribution-Non commercial-No Derivative Works 3.0 License</a>.</span></div></div></body></html>
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