PopCap Game Framework（SexyApp Framework）技术文档

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"宝开游戏框架（PopCap Game Framework）是一份专有且保密的游戏开发文档，旨在提供灵活的高级库，包含常用功能和可重用组件。该框架以SexyApp Framework为名，设计目的是简化高质量游戏的开发过程，让游戏程序员能够专注于游戏概念的表达，同时减少创建丰富视觉和音频呈现所需的劳动量。PopCap的所有豪华版游戏都基于此框架，这些游戏已超过1亿次下载。" PopCap Game Framework，也称为SexyApp Framework，是宝开公司开发的一款专有的、高度灵活的游戏开发框架。它用C++编写，特别针对Visual C++ 6.0和Visual C++.NET进行优化，确保兼容性。该框架主要面向Windows 95到XP操作系统上的DirectX 6及以上版本，利用第三方库BASS来支持音乐和额外的声音功能。技术基础： 1. **编程语言与编译器**：PopCap Game Framework使用C++语言编写，考虑到与Visual Studio的兼容性，特别是Visual C++ 6.0和Visual C++.NET版本。 2. **图形渲染**：框架支持两种渲染模式，一种是硬件加速模式，用于现代特效，另一种是2D非加速兼容模式，适用于较旧的计算机。这两种模式都使用相同的底层基本绘图接口，但在不同的硬件支持下实现不同的性能表现。 3. **音频支持**：框架采用第三方库BASS，提供了音乐播放和额外的声音效果支持，增强了游戏的音频体验。 4. **平台兼容性**：尽管最初针对的是Windows平台，但框架设计的兼容性允许其在多种DirectX版本上运行，适应不同性能的计算机系统。应用与影响力： PopCap Game Framework在宝开公司的豪华版游戏中广泛应用，这些游戏的下载量超过1亿次，显示出框架在游戏开发领域的强大效能和广泛接受度。它的成功在于减少了开发者在基础架构上的工作，使他们能更专注于游戏创新和玩家体验的提升。 PopCap Game Framework是一个高效、灵活的游戏开发工具，它通过提供通用功能和组件，降低了开发复杂性，提高了开发速度，同时保证了游戏的质量和跨平台兼容性。对于任何希望进入游戏开发领域的程序员或团队来说，理解并掌握这一框架都将极大地提升他们的开发效率和游戏品质。

dirty by calling Widget::MarkDirty to indicate that it should be redrawn. When

MarkDirty is called, it may trigger other widgets to redraw depending on the

position of the Widget. If other Widgets appear over the Widget being redrawn,

for example, they will need to be redrawn since the drawing of the first Widget

will write over pixels owned by the Widget on top.

The redrawing will occur after all the widgets have been brought up-to-date by

having their Update methods called. The Widgets will have their Draw methods

called in back-to-front order, with a Graphics object being passed in. The

Graphics object represents a drawing destination, and contains all the drawing

methods available to the application. All drawing coordinates will be relative to

the Widget‟s coordinates and will be clipped to the Widget‟s extents.

Update / Draw Independence

Ideally, you should imagine that you app will always have it‟s Updates called 100

times per second but may NEVER have it‟s Draw methods called. Regardless,

the game state should proceed EXACTLY as it would as if Draw was getting

called 60 or 80 times per second. Always think to yourself, “if I had missed Draw

for the last 5 seconds and then got one right now, would I be drawing exactly the

same thing to the screen as if I had gotten one Draw for every Update up until

now?” If your answer is no, you should think about redesigning your code path as

you could be introducing timing issues that could be hard to track down and fix

later. Furthermore, it could break the helpful demo recording capability built into

the framework.

Smooth Updating

Smooth updating is an advanced optional feature that is unused in nearly all of our

games, but can help achieve smoother effects in some cases, particularly for side-

scrolling games. The core problem that smooth updating overcomes is the

temporal aliasing between updating game logic at 100 HZ and a monitor refresh

rate that can run anywhere between 60HZ to 85HZ (and sometimes even higher).

The goal is to sync the movement of objects in the game to the monitor refresh

rate while still allowing us the simplicity of having a set update rate for most of

the game logic.

The solution consists of having two separate update calls for a widget, Update

(which is called at 100HZ), and UpdateF (which is called at the monitor‟s refresh

rate). UpdateF has a floating point number passed in, which represents how many

100HZ units that one call represents, which will always be between 1 and 1.67.

Because the monitor refresh rate will vary on different computers you will have to

take that foating point number into account in every time-based calculation that

occurs in UpdateF, such as motion. While that makes the implementation of the

UpdateF call somewhat less convenient than the fixed-rate Update call, you may

mix logic amongst the two to get the best of both words. To ensure good

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