C++ 游戏开发

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C++游戏开发

C++ 是一种高效、灵活且功能强大的编程语言࿰c;因其性能和控制能力而在游戏开发中被广泛应用。许多著名的游戏引擎࿰c;如 Unreal Engine、CryEngine 和 Godot 等࿰c;都依赖于 C++ 进行核心开发。本文将详细介绍 C++ 在游戏开发中的应用࿰c;从引擎选择、基本游戏架构到图形处理࿰c;并提供一些展示代码。
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1. C++ 游戏开发的优势

1.1 高性能

游戏开发中的一个关键要求是高性能࿰c;尤其是在图形处理、物理引擎和实时交互方面。C++ 作为一门面向对象语言࿰c;同时提供了直接操作硬件的能力和底层内存管理的功能࿰c;这使得它可以最大限度地优化游戏性能。

1.2 精确的内存管理

C++ 提供了手动内存管理的功能࿰c;通过 <code>newcode> 和 <code>deletecode> 操作符࿰c;开发者可以更加精细地控制资源的分配与释放。相比于 Java 或 C# 等依赖垃圾回收机制的语言࿰c;C++ 的手动内存管理在需要极高性能的游戏开发场景中具有更大的优势。

1.3 广泛的库支持

C++ 拥有丰富的第三方库支持࿰c;如用于物理引擎的 Bullet Physics、用于图形渲染的 OpenGL 以及 DirectX、用于声音处理的 FMOD 等。开发者可以通过集成这些库࿰c;快速搭建游戏中的关键组件。
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2. C++ 游戏开发的基本框架

在开始开发一个游戏时࿰c;我们需要定义游戏的基本架构。无论是 2D 还是 3D 游戏࿰c;通常都需要以下几个主要模块：

游戏引擎：负责管理游戏循环、场景、物理模拟等。
输入系统：处理用户输入（如键盘、鼠标、手柄等）。
渲染系统：负责图形的渲染和绘制。
音频系统：处理游戏中的音效和背景音乐。
物理系统：模拟物体之间的物理交互࿰c;如碰撞、重力等。

2.1 游戏循环

游戏循环是游戏的核心部分࿰c;它不断地更新游戏状态并渲染画面。典型的游戏循环包含三个步骤：

处理输入
更新游戏状态
渲染帧

以下是一个简单的 C++ 游戏循环的代码示例：

<code class="prism language-cpp">class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><iostream>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><chrono>class="token keyword">bool isRunning class="token operator">= class="token boolean">trueclass="token punctuation">;class="token keyword">void class="token function">processInputclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token comment">// 假设这里处理键盘或鼠标输入stdclass="token operator">::cout class="token operator"><< class="token string">"Processing input..." class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;
class="token punctuation">}class="token keyword">void class="token function">updateclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token comment">// 更新游戏状态࿰c;如角色移动、碰撞检测等stdclass="token operator">::cout class="token operator"><< class="token string">"Updating game state..." class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;
class="token punctuation">}class="token keyword">void class="token function">renderclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token comment">// 渲染图形到屏幕上stdclass="token operator">::cout class="token operator"><< class="token string">"Rendering frame..." class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;
class="token punctuation">}class="token keyword">int class="token function">mainclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token keyword">auto lastFrameTime class="token operator">= stdclass="token operator">::chronoclass="token operator">::high_resolution_clockclass="token operator">::class="token function">nowclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">while class="token punctuation">(isRunningclass="token punctuation">) class="token punctuation">{class="token comment">// 计算每帧间隔时间class="token keyword">auto currentFrameTime class="token operator">= stdclass="token operator">::chronoclass="token operator">::high_resolution_clockclass="token operator">::class="token function">nowclass="token punctuation">(class="token punctuation">)class="token punctuation">;stdclass="token operator">::chronoclass="token operator">::durationclass="token operator"><class="token keyword">floatclass="token operator">> deltaTime class="token operator">= currentFrameTime class="token operator">- lastFrameTimeclass="token punctuation">;lastFrameTime class="token operator">= currentFrameTimeclass="token punctuation">;class="token function">processInputclass="token punctuation">(class="token punctuation">)class="token punctuation">;  class="token comment">// 处理输入class="token function">updateclass="token punctuation">(class="token punctuation">)class="token punctuation">;        class="token comment">// 更新游戏状态class="token function">renderclass="token punctuation">(class="token punctuation">)class="token punctuation">;        class="token comment">// 渲染帧class="token comment">// 简单退出条件class="token keyword">char quitclass="token punctuation">;stdclass="token operator">::cout class="token operator"><< class="token string">"Press q to quit: "class="token punctuation">;stdclass="token operator">::cin class="token operator">>> quitclass="token punctuation">;class="token keyword">if class="token punctuation">(quit class="token operator">== class="token string">'q'class="token punctuation">) isRunning class="token operator">= class="token boolean">falseclass="token punctuation">;class="token punctuation">}class="token keyword">return class="token number">0class="token punctuation">;
class="token punctuation">}
code>

这个简单的例子展示了一个基本的游戏循环࿰c;它不断处理输入、更新游戏状态和渲染画面。

2.2 引入第三方库：SDL

为了在实际游戏开发中获得更好的图形处理能力࿰c;我们可以使用 SDL（Simple DirectMedia Layer）库。SDL 是一个跨平台的多媒体库࿰c;提供了对音频、键盘、鼠标、显示等硬件的低级访问。

2.2.1 安装 SDL

在基于 Linux 的系统上࿰c;你可以通过包管理器安装 SDL。比如在 Debian 系列系统上࿰c;使用以下命令：

<code class="prism language-bash">class="token function">sudo class="token function">apt-get class="token function">install libsdl2-dev
code>

2.2.2 使用 SDL 创建窗口和处理输入

以下是一个使用 SDL 创建简单游戏窗口并处理输入的代码示例：

<code class="prism language-cpp">class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><SDL2/SDL.h>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><iostream>class="token keyword">const class="token keyword">int WINDOW_WIDTH class="token operator">= class="token number">800class="token punctuation">;
class="token keyword">const class="token keyword">int WINDOW_HEIGHT class="token operator">= class="token number">600class="token punctuation">;class="token keyword">int class="token function">mainclass="token punctuation">(class="token keyword">int argcclass="token punctuation">, class="token keyword">charclass="token operator">* argvclass="token punctuation">[class="token punctuation">]class="token punctuation">) class="token punctuation">{class="token comment">// 初始化 SDLclass="token keyword">if class="token punctuation">(class="token function">SDL_Initclass="token punctuation">(SDL_INIT_VIDEOclass="token punctuation">) class="token operator">< class="token number">0class="token punctuation">) class="token punctuation">{stdclass="token operator">::cerr class="token operator"><< class="token string">"Failed to initialize SDL: " class="token operator"><< class="token function">SDL_GetErrorclass="token punctuation">(class="token punctuation">) class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;class="token keyword">return class="token operator">-class="token number">1class="token punctuation">;class="token punctuation">}class="token comment">// 创建窗口SDL_Windowclass="token operator">* window class="token operator">= class="token function">SDL_CreateWindowclass="token punctuation">(class="token string">"C++ Game Development"class="token punctuation">,SDL_WINDOWPOS_CENTEREDclass="token punctuation">,SDL_WINDOWPOS_CENTEREDclass="token punctuation">,WINDOW_WIDTHclass="token punctuation">, WINDOW_HEIGHTclass="token punctuation">,SDL_WINDOW_SHOWNclass="token punctuation">)class="token punctuation">;class="token keyword">if class="token punctuation">(class="token operator">!windowclass="token punctuation">) class="token punctuation">{stdclass="token operator">::cerr class="token operator"><< class="token string">"Failed to create window: " class="token operator"><< class="token function">SDL_GetErrorclass="token punctuation">(class="token punctuation">) class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;class="token function">SDL_Quitclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">return class="token operator">-class="token number">1class="token punctuation">;class="token punctuation">}class="token comment">// 创建渲染器SDL_Rendererclass="token operator">* renderer class="token operator">= class="token function">SDL_CreateRendererclass="token punctuation">(windowclass="token punctuation">, class="token operator">-class="token number">1class="token punctuation">, SDL_RENDERER_ACCELERATEDclass="token punctuation">)class="token punctuation">;class="token keyword">if class="token punctuation">(class="token operator">!rendererclass="token punctuation">) class="token punctuation">{stdclass="token operator">::cerr class="token operator"><< class="token string">"Failed to create renderer: " class="token operator"><< class="token function">SDL_GetErrorclass="token punctuation">(class="token punctuation">) class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;class="token function">SDL_DestroyWindowclass="token punctuation">(windowclass="token punctuation">)class="token punctuation">;class="token function">SDL_Quitclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">return class="token operator">-class="token number">1class="token punctuation">;class="token punctuation">}class="token keyword">bool isRunning class="token operator">= class="token boolean">trueclass="token punctuation">;SDL_Event eventclass="token punctuation">;class="token comment">// 游戏主循环class="token keyword">while class="token punctuation">(isRunningclass="token punctuation">) class="token punctuation">{class="token keyword">while class="token punctuation">(class="token function">SDL_PollEventclass="token punctuation">(class="token operator">&eventclass="token punctuation">)class="token punctuation">) class="token punctuation">{class="token keyword">if class="token punctuation">(eventclass="token punctuation">.type class="token operator">== SDL_QUITclass="token punctuation">) class="token punctuation">{isRunning class="token operator">= class="token boolean">falseclass="token punctuation">;class="token punctuation">}class="token punctuation">}class="token comment">// 设置渲染颜色（红色）class="token function">SDL_SetRenderDrawColorclass="token punctuation">(rendererclass="token punctuation">, class="token number">255class="token punctuation">, class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">255class="token punctuation">)class="token punctuation">;class="token comment">// 清空屏幕class="token function">SDL_RenderClearclass="token punctuation">(rendererclass="token punctuation">)class="token punctuation">;class="token comment">// 绘制内容（此处为简单的红色背景）class="token function">SDL_RenderPresentclass="token punctuation">(rendererclass="token punctuation">)class="token punctuation">;class="token punctuation">}class="token comment">// 清理 SDL 资源class="token function">SDL_DestroyRendererclass="token punctuation">(rendererclass="token punctuation">)class="token punctuation">;class="token function">SDL_DestroyWindowclass="token punctuation">(windowclass="token punctuation">)class="token punctuation">;class="token function">SDL_Quitclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">return class="token number">0class="token punctuation">;
class="token punctuation">}
code>

2.3 使用图形 API：OpenGL

SDL 提供了基础的窗口和输入管理功能࿰c;但如果需要更高级的图形处理功能࿰c;如 3D 渲染࿰c;则需要结合图形 API࿰c;如 OpenGL。以下是一个简单的 OpenGL 程序࿰c;它展示了如何在 C++ 中使用 OpenGL 进行渲染。

2.3.1 安装 OpenGL

在 Linux 上可以使用以下命令安装 OpenGL：

<code class="prism language-bash">class="token function">sudo class="token function">apt-get class="token function">install libgl1-mesa-dev libglu1-mesa-dev
code>

2.3.2 OpenGL 渲染示例

<code class="prism language-cpp">class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><GL/gl.h>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><GL/glu.h>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><SDL2/SDL.h>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><iostream>class="token keyword">void class="token function">renderclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token comment">// 清除颜色和深度缓冲区class="token function">glClearclass="token punctuation">(GL_COLOR_BUFFER_BIT class="token operator">| GL_DEPTH_BUFFER_BITclass="token punctuation">)class="token punctuation">;class="token function">glLoadIdentityclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token comment">// 开始绘制三角形class="token function">glBeginclass="token punctuation">(GL_TRIANGLESclass="token punctuation">)class="token punctuation">;class="token function">glColor3fclass="token punctuation">(class="token number">1.0fclass="token punctuation">, class="token number">0.0fclass="token punctuation">, class="token number">0.0fclass="token punctuation">)class="token punctuation">; class="token comment">// 红色class="token function">glVertex3fclass="token punctuation">(class="token operator">-class="token number">0.5fclass="token punctuation">, class="token operator">-class="token number">0.5fclass="token punctuation">, class="token number">0.0fclass="token punctuation">)class="token punctuation">;class="token function">glColor3fclass="token punctuation">(class="token number">0.0fclass="token punctuation">, class="token number">1.0fclass="token punctuation">, class="token number">0.0fclass="token punctuation">)class="token punctuation">; class="token comment">// 绿色class="token function">glVertex3fclass="token punctuation">(class="token number">0.5fclass="token punctuation">, class="token operator">-class="token number">0.5fclass="token punctuation">, class="token number">0.0fclass="token punctuation">)class="token punctuation">;class="token function">glColor3fclass="token punctuation">(class="token number">0.0fclass="token punctuation">, class="token number">0.0fclass="token punctuation">, class="token number">1.0fclass="token punctuation">)class="token punctuation">; class="token comment">// 蓝色class="token function">glVertex3fclass="token punctuation">(class="token number">0.0fclass="token punctuation">, class="token number">0.5fclass="token punctuation">, class="token number">0.0fclass="token punctuation">)class="token punctuation">;class="token function">glEndclass="token punctuation">(class="token punctuation">)class="token punctuation">;
class="token punctuation">}class="token keyword">int class="token function">mainclass="token punctuation">(class="token keyword">int argcclass="token punctuation">, class="token keyword">charclass="token operator">* argvclass="token punctuation">[class="token punctuation">]class="token punctuation">) class="token punctuation">{class="token function">SDL_Initclass="token punctuation">(SDL_INIT_VIDEOclass="token punctuation">)class="token punctuation">;class="token comment">// 设置 OpenGL 上下文属性class="token function">SDL_GL_SetAttributeclass="token punctuation">(SDL_GL_CONTEXT_MAJOR_VERSIONclass="token punctuation">, class="token number">3class="token punctuation">)class="token punctuation">;class="token function">SDL_GL_SetAttributeclass="token punctuation">(SDL_GL_CONTEXT_MINOR_VERSIONclass="token punctuation">, class="token number">3class="token punctuation">)class="token punctuation">;class="token function">SDL_GL_SetAttributeclass="token punctuation">(SDL_GL_CONTEXT_PROFILE_MASKclass="token punctuation">, SDL_GL_CONTEXT_PROFILE_COREclass="token punctuation">)class="token punctuation">;SDL_Windowclass="token operator">* window class="token operator">= class="token function">SDL_CreateWindowclass="token punctuation">(class="token string">"OpenGL Triangle"class="token punctuation">, SDL_WINDOWPOS_CENTEREDclass="token punctuation">, SDL_WINDOWPOS_CENTEREDclass="token punctuation">, class="token number">800class="token punctuation">, class="token number">600class="token punctuation">, SDL_WINDOW_OPENGLclass="token punctuation">)class="token punctuation">;SDL_GLContext glContext class="token operator">= class="token function">SDL_GL_CreateContextclass="token punctuation">(windowclass="token punctuation">)class="token punctuation">;class="token keyword">if class="token punctuation">(class="token operator">!glContextclass="token punctuation">) class="token punctuation">{stdclass="token operator">::cerr class="token operator"><< class="token string">"Failed to create OpenGL context: " class="token operator"><< class="token function">SDL_GetErrorclass="token punctuation">(class="token punctuation">) class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;class="token keyword">return class="token operator">-class="token number">1class="token punctuation">;class="token punctuation">}class="token keyword">bool isRunning class="token operator">= class="token boolean">trueclass="token punctuation">;SDL_Event eventclass="token punctuation">;class="token keyword">while class="token punctuation">(isRunningclass="token punctuation">) class="token punctuation">{class="token keyword">while class="token punctuation">(class="token function">SDL_PollEventclass="token punctuation">(class="token operator">&eventclass="token punctuation">)class="token punctuation">) class="token punctuation">{class="token keyword">if class="token punctuation">(eventclass="token punctuation">.type class="token operator">== SDL_QUITclass="token punctuation">) class="token punctuation">{isRunning class="token operator">= class="token boolean">falseclass="token punctuation">;class="token punctuation">}class="token punctuation">}class="token function">renderclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token function">SDL_GL_SwapWindowclass="token punctuation">(windowclass="token punctuation">)class="token punctuation">;class="token punctuation">}SDL_GL_DeleteContext```class="token function">cppclass="token punctuation">(glContextclass="token punctuation">)class="token punctuation">;class="token function">SDL_DestroyWindowclass="token punctuation">(windowclass="token punctuation">)class="token punctuation">;class="token function">SDL_Quitclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">return class="token number">0class="token punctuation">;
class="token punctuation">}
code>

2.3.3 代码解析

该示例代码展示了如何使用 OpenGL 在 C++ 程序中渲染一个简单的三角形。以下是代码的几个关键部分：

OpenGL 上下文设置：在使用 OpenGL 渲染时࿰c;首先需要通过 <code>SDL_GL_SetAttributecode> 函数设置 OpenGL 上下文的版本和配置࿰c;确保兼容现代的 OpenGL 核心功能。
渲染循环：<code>render()code> 函数中包含了 OpenGL 的基本绘图过程࿰c;首先清除缓冲区࿰c;然后使用 <code>glBegin()code> 和 <code>glEnd()code> 绘制一个三角形。
颜色设置：通过 <code>glColor3f()code>࿰c;我们为三角形的每个顶点设置不同的颜色࿰c;最终 OpenGL 会自动为每个像素插值生成过渡的颜色。
窗口交换缓冲：每一帧渲染结束后࿰c;使用 <code>SDL_GL_SwapWindow()code> 函数交换前后缓冲区࿰c;以更新屏幕内容。

cs_242">2.4 使用物理引擎：Bullet Physics

物理引擎是现代游戏中不可或缺的一部分࿰c;特别是在处理物体碰撞、刚体动力学和力学仿真时࿰c;使用物理引擎可以大大简化开发工作。Bullet 是 C++ 社区中常用的开源物理引擎。

cs_245">2.4.1 安装 Bullet Physics

在 Linux 系统上可以通过以下命令安装 Bullet 物理引擎：

<code class="prism language-bash">class="token function">sudo class="token function">apt-get class="token function">install libbullet-dev
code>

2.4.2 Bullet 示例代码

以下是使用 Bullet 物理引擎进行简单刚体动力学仿真的示例代码：

<code class="prism language-cpp">class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><btBulletDynamicsCommon.h>
class="token macro property">class="token directive-hash">#class="token directive keyword">include class="token string"><iostream>class="token keyword">int class="token function">mainclass="token punctuation">(class="token punctuation">) class="token punctuation">{class="token comment">// 创建 Bullet 世界btDefaultCollisionConfigurationclass="token operator">* collisionConfig class="token operator">= class="token keyword">new class="token function">btDefaultCollisionConfigurationclass="token punctuation">(class="token punctuation">)class="token punctuation">;btCollisionDispatcherclass="token operator">* dispatcher class="token operator">= class="token keyword">new class="token function">btCollisionDispatcherclass="token punctuation">(collisionConfigclass="token punctuation">)class="token punctuation">;btBroadphaseInterfaceclass="token operator">* overlappingPairCache class="token operator">= class="token keyword">new class="token function">btDbvtBroadphaseclass="token punctuation">(class="token punctuation">)class="token punctuation">;btSequentialImpulseConstraintSolverclass="token operator">* solver class="token operator">= class="token keyword">new class="token function">btSequentialImpulseConstraintSolverclass="token punctuation">(class="token punctuation">)class="token punctuation">;btDiscreteDynamicsWorldclass="token operator">* dynamicsWorld class="token operator">= class="token keyword">new class="token function">btDiscreteDynamicsWorldclass="token punctuation">(dispatcherclass="token punctuation">, overlappingPairCacheclass="token punctuation">, solverclass="token punctuation">, collisionConfigclass="token punctuation">)class="token punctuation">;dynamicsWorldclass="token operator">->class="token function">setGravityclass="token punctuation">(class="token function">btVector3class="token punctuation">(class="token number">0class="token punctuation">, class="token operator">-class="token number">9.8class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">)class="token punctuation">;class="token comment">// 创建地面平面btCollisionShapeclass="token operator">* groundShape class="token operator">= class="token keyword">new class="token function">btStaticPlaneShapeclass="token punctuation">(class="token function">btVector3class="token punctuation">(class="token number">0class="token punctuation">, class="token number">1class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">, class="token number">1class="token punctuation">)class="token punctuation">;btDefaultMotionStateclass="token operator">* groundMotionState class="token operator">= class="token keyword">new class="token function">btDefaultMotionStateclass="token punctuation">(class="token function">btTransformclass="token punctuation">(class="token function">btQuaternionclass="token punctuation">(class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">1class="token punctuation">)class="token punctuation">, class="token function">btVector3class="token punctuation">(class="token number">0class="token punctuation">, class="token operator">-class="token number">1class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">)class="token punctuation">)class="token punctuation">;btRigidBodyclass="token operator">::btRigidBodyConstructionInfo class="token function">groundRigidBodyCIclass="token punctuation">(class="token number">0class="token punctuation">, groundMotionStateclass="token punctuation">, groundShapeclass="token punctuation">, class="token function">btVector3class="token punctuation">(class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">)class="token punctuation">;btRigidBodyclass="token operator">* groundRigidBody class="token operator">= class="token keyword">new class="token function">btRigidBodyclass="token punctuation">(groundRigidBodyCIclass="token punctuation">)class="token punctuation">;dynamicsWorldclass="token operator">->class="token function">addRigidBodyclass="token punctuation">(groundRigidBodyclass="token punctuation">)class="token punctuation">;class="token comment">// 创建动态刚体btCollisionShapeclass="token operator">* fallShape class="token operator">= class="token keyword">new class="token function">btSphereShapeclass="token punctuation">(class="token number">1class="token punctuation">)class="token punctuation">;btDefaultMotionStateclass="token operator">* fallMotionState class="token operator">= class="token keyword">new class="token function">btDefaultMotionStateclass="token punctuation">(class="token function">btTransformclass="token punctuation">(class="token function">btQuaternionclass="token punctuation">(class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">1class="token punctuation">)class="token punctuation">, class="token function">btVector3class="token punctuation">(class="token number">0class="token punctuation">, class="token number">50class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">)class="token punctuation">)class="token punctuation">;btScalar mass class="token operator">= class="token number">1class="token punctuation">;btVector3 class="token function">fallInertiaclass="token punctuation">(class="token number">0class="token punctuation">, class="token number">0class="token punctuation">, class="token number">0class="token punctuation">)class="token punctuation">;fallShapeclass="token operator">->class="token function">calculateLocalInertiaclass="token punctuation">(massclass="token punctuation">, fallInertiaclass="token punctuation">)class="token punctuation">;btRigidBodyclass="token operator">::btRigidBodyConstructionInfo class="token function">fallRigidBodyCIclass="token punctuation">(massclass="token punctuation">, fallMotionStateclass="token punctuation">, fallShapeclass="token punctuation">, fallInertiaclass="token punctuation">)class="token punctuation">;btRigidBodyclass="token operator">* fallRigidBody class="token operator">= class="token keyword">new class="token function">btRigidBodyclass="token punctuation">(fallRigidBodyCIclass="token punctuation">)class="token punctuation">;dynamicsWorldclass="token operator">->class="token function">addRigidBodyclass="token punctuation">(fallRigidBodyclass="token punctuation">)class="token punctuation">;class="token comment">// 模拟物理世界class="token keyword">for class="token punctuation">(class="token keyword">int i class="token operator">= class="token number">0class="token punctuation">; i class="token operator">< class="token number">300class="token punctuation">; iclass="token operator">++class="token punctuation">) class="token punctuation">{dynamicsWorldclass="token operator">->class="token function">stepSimulationclass="token punctuation">(class="token number">1 class="token operator">/ class="token number">60.fclass="token punctuation">, class="token number">10class="token punctuation">)class="token punctuation">;btTransform transclass="token punctuation">;fallRigidBodyclass="token operator">->class="token function">getMotionStateclass="token punctuation">(class="token punctuation">)class="token operator">->class="token function">getWorldTransformclass="token punctuation">(transclass="token punctuation">)class="token punctuation">;stdclass="token operator">::cout class="token operator"><< class="token string">"Sphere height: " class="token operator"><< transclass="token punctuation">.class="token function">getOriginclass="token punctuation">(class="token punctuation">)class="token punctuation">.class="token function">getYclass="token punctuation">(class="token punctuation">) class="token operator"><< stdclass="token operator">::endlclass="token punctuation">;class="token punctuation">}class="token comment">// 清理内存dynamicsWorldclass="token operator">->class="token function">removeRigidBodyclass="token punctuation">(fallRigidBodyclass="token punctuation">)class="token punctuation">;class="token keyword">delete fallRigidBodyclass="token operator">->class="token function">getMotionStateclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">delete fallRigidBodyclass="token punctuation">;class="token keyword">delete fallShapeclass="token punctuation">;dynamicsWorldclass="token operator">->class="token function">removeRigidBodyclass="token punctuation">(groundRigidBodyclass="token punctuation">)class="token punctuation">;class="token keyword">delete groundRigidBodyclass="token operator">->class="token function">getMotionStateclass="token punctuation">(class="token punctuation">)class="token punctuation">;class="token keyword">delete groundRigidBodyclass="token punctuation">;class="token keyword">delete groundShapeclass="token punctuation">;class="token keyword">delete dynamicsWorldclass="token punctuation">;class="token keyword">delete solverclass="token punctuation">;class="token keyword">delete overlappingPairCacheclass="token punctuation">;class="token keyword">delete dispatcherclass="token punctuation">;class="token keyword">delete collisionConfigclass="token punctuation">;class="token keyword">return class="token number">0class="token punctuation">;
class="token punctuation">}
code>

2.4.3 代码解析

该示例展示了如何使用 Bullet 进行刚体仿真：

btDiscreteDynamicsWorld：物理世界的核心类࿰c;它负责管理所有刚体、碰撞检测和力学计算。
btRigidBody：表示物理世界中的刚体࿰c;地面使用了一个静态平面࿰c;而动态物体使用了一个球体形状。
stepSimulation：物理世界的更新函数࿰c;它按一定时间步长模拟物理现象。

通过该代码࿰c;你可以看到刚体（球体）在重力作用下从初始高度 50 逐渐下降到地面࿰c;并通过物理引擎计算其位置。
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3. C++ 游戏开发总结

C++ 在游戏开发中有着不可替代的优势࿰c;尤其是在性能要求极高的实时渲染、物理仿真等方面。结合 SDL、OpenGL 和 Bullet 等第三方库࿰c;可以快速构建一个功能完整的游戏引擎框架࿰c;并在此基础上实现各种游戏功能。

本文通过示例展示了如何使用 C++ 创建基本的游戏循环࿰c;如何通过 SDL 进行窗口管理和渲染࿰c;如何使用 OpenGL 渲染简单的图形࿰c;最后如何集成 Bullet 物理引擎进行物理仿真。游戏开发是一个复杂的过程࿰c;C++ 提供了强大的工具和灵活的架构࿰c;帮助开发者创建出高性能、可扩展的游戏。希望本文能为你理解和使用 C++ 开发游戏提供一个良好的起点。
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