SFML | GameDevLog

介绍

Simple and Fast Multimedia Library

多媒体

SFML 提供简单的接口使你容易开发游戏和多媒体应用教程和 API

五大模块

system 系统
window 窗口
graphics 图形
audio 音频
network 网络

Multimedia image

多平台

支持 Windows, Linux, macOS，很快也会支持 Android & iOS

编译好的 SDK 下载地址

Multiplatform image

多语言

官方支持 C 和 .Net 平台语言，社区支持 Java, Ruby, Python, Go 等多种语言

查看更多 bindings page.

Multilanguage image

教程

SFML and Xcode (macOS)

推荐 frameworks，尽管 dylibs 和 frameworks 可在同一系统同时安装（我都安装了）

frameworks
- 复制 Frameworks 下所有内容到 /Library/Frameworks
dylibs
- 复制 lib 下所有内容到 /usr/local/lib
- 复制 include 下所有内容到 /usr/local/include

SFML 依赖

复制 extlibs 下所有内容到 /Library/Frameworks
Installing SFML

Xcode 模板

复制 templates 下所有内容到 ~/Library/Developer/Xcode/Templates

macOS
- SFML App macOS App
- SFML CLT 传统 Unix 程序

问题

`SFML App`

ditto: can't get real path for source '/Users/SFML/Desktop/packaging/tmp/install/Library/Frameworks/sfml-system.framework'

couldn't copy /Users/SFML/Desktop/packaging/tmp/install/Library/Frameworks/sfml-system.framework to /Users/iosdevlog/Library/Developer/Xcode/DerivedData/X-czgcehtuernfweapkkunlrhgcjqf/Build/Products/Debug/X.app/Contents/Frameworks//sfml-system.framework

Command PhaseScriptExecution failed with a nonzero exit code

Target
- Build Phase
  - Run Script
    - Run Script only when installing: true

`SFML CLT`

1	2019-12-19 14:36:17.966474+0800 sa[79489:1852939] Metal API Validation Enabled
2	2019-12-19 14:36:18.114539+0800 sa[79489:1853624] flock failed to lock maps file: errno = 35
3	2019-12-19 14:36:18.116856+0800 sa[79489:1853624] flock failed to lock maps file: errno = 35
4	Failed to load image "icon.png". Reason: Unable to open file
5	Program ended with exit code: 1

Target
- Build Phase
  - + New Copy Files Phase
    - add Resources

示例

Window creation / 创建窗口
Creation of graphic display / 显示图形
Handle user inputs / 处理输入
Deal with the user inputs / 处理输入
Display game objects on the screen / 显示

class Game {
public:
    // non copyable class
    Game(const Game &) = delete;
    Game &operator=(const Game &) = delete;
    Game(); //< constructor
    void run();

private:
    void processEvents(); //< Process events
    void update(); //< do some updates
    void render(); //< draw all the stuff

    sf::RenderWindow _window; //< the window use to display the game
    sf::CircleShape _player;
};

int main(int argc, char *argv[]) {
    Game game;
    game.run();

    return 0;
}

= delete 是 C++ 11 新特性，允许我们显示删除类的 成员函数，不可 copy
另一方案是扩展 sf::NonCopyable
= default 显示 build
processEvents(): This will manage all events from the user
update(): This will update the entire game
render(): This will manage all the rendering of the game

Example 1

CMakeLists.txt

cmake_minimum_required(VERSION 3.1)

set (CMAKE_CXX_STANDARD 11)

project(main)

## If you want to link SFML statically
# set(SFML_STATIC_LIBRARIES TRUE)

## In most cases better set in the CMake cache
# set(SFML_DIR "<sfml root prefix>/lib/cmake/SFML")

find_package(SFML 2.5 COMPONENTS system window graphics audio network REQUIRED)
add_executable(main main.cpp)
target_link_libraries(main sfml-system sfml-window sfml-graphics sfml-audio sfml-network)

main.cpp

#include <SFML/Window.hpp>
#include <SFML/Graphics.hpp>

int main(int argc,char* argv[])
{
    //the window use for the display
    sf::RenderWindow window(sf::VideoMode(400,400),"01_Introduction");
    //set the maximum frame per second
    window.setFramerateLimit(60);

    //construct a circle
    sf::CircleShape circle(150);
    //set his color
    circle.setFillColor(sf::Color::Blue);
    //set his position
    circle.setPosition(10, 20);

    //main loop
    while (window.isOpen())
    {
        //to store the events
        sf::Event event;
        //process events
        while(window.pollEvent(event))
        {
            //Close window
            if (event.type == sf::Event::Closed)
                window.close();
            //keyboard input : Escape is press
            else if (event.type == sf::Event::KeyPressed and event.key.code == sf::Keyboard::Escape)
                window.close();
        }

        //Clear screen
        window.clear();

        //draw the cirle
        window.draw(circle);

        //Update the window
        window.display();

    }

    return 0;
}

shell

1	cmake .
2	make
3	./main

同时编译多个 cpp 文件

CMakeLists.txt

cmake_minimum_required(VERSION 3.1)

project(MulitExe)

file(GLOB_RECURSE EXTRA_FILES */*)
add_custom_target(${PROJECT_NAME}_OTHER_FILES ALL WORKING_DIRECTORY ${PROJECT_SOURCE_DIR} SOURCES ${EXTRA_FILES})
file(GLOB_RECURSE code_sources "*.cpp")

foreach(code_src ${code_sources})
    get_filename_component(mexecutable ${code_src} NAME_WE)
    find_package(SFML 2.5 COMPONENTS system window graphics audio network REQUIRED)
    add_executable(${mexecutable} ${code_src})
    target_link_libraries(${mexecutable} sfml-system sfml-window sfml-graphics sfml-audio sfml-network)
endforeach()

小结

参考：