android sdl demo

2024-02-03 10:27:34

官方网址

http://www.libsdl.org/

1. Introduction to SDL

1.1. What is SDL?

Simple DirectMedia Layer is a cross-platform development library designed to provide low level access to audio, keyboard, mouse, joystick, and graphics hardware via OpenGL and Direct3D. It is used by video playback software, emulators, and popular games including Valve's award winning catalog and many Humble Bundle games.

SDL officially supports Windows, Mac OS X, Linux, iOS, and Android. Support for other platforms may be found in the source code.

For the latest information on what is supported see the page about Installation.

SDL is written in C, works natively with C++, and there are bindings available for several other languages, including C# and Python.

For the latest list of languages see http://www.libsdl.org/languages.php

SDL 2.0 is distributed under the zlib license. This license allows you to use SDL freely in any software. The Simple DirectMedia Layer library (SDL) is a general API that provides low level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL, and 2D framebuffer across multiple platforms.

1.2. What can SDL do?

Read ahead for an overview of what SDL is capable of. If you're simply interested in the changes from 1.2 to 2.0, check out the Migration Guide.

Video

3D graphics:
- SDL can be used in combination with the OpenGL API or Direct3D API for 3D graphics
Accelerated 2D render API:
- Supports easy rotation, scaling and alpha blending, all accelerated using modern 3D APIs
- Acceleration is supported using OpenGL and Direct3D, and there is a software fallback
Create and manage multiple windows

Input Events

Events and API functions provided for:
- Application and window state changes
- Mouse input
- Keyboard input
- Joystick and game controller input
- Multitouch gestures
Each event can be enabled or disabled with SDL_EventState()
Events are passed through a user-specified filter function before being posted to the internal event queue
Thread-safe event queue

Force Feedback

Force feedback is supported under Windows, Mac OS X and Linux

Audio

Set audio playback of 8-bit and 16-bit audio, mono stereo or 5.1 surround sound, with optional conversion if the format is not supported by the hardware
Audio runs independently in a separate thread, filled via a user callback mechanism
Designed for custom software audio mixers, but SDL_mixer provides a complete audio/music output library

File I/O Abstraction

General purpose abstraction for opening, reading and writing data
Built-in support for files and memory

Shared Object Support

Load shared objects (DLL on Windows, .dylib on Mac OS X, .so on Linux)
Lookup functions in shared objects

Threads

Simple thread creation API
Simple thread local storage API
Mutexes, semaphores and condition variables
Atomic operations for lockless programming

Timers

Get the number of milliseconds elapsed
Wait a specified number of milliseconds
Create timers that run alongside your code in a separate thread
Use high resolution counter for profiling

CPU Feature Detection

Query the number of CPUs
Detect CPU features and supported instruction sets

Endian Independence

Detect the endianness of the current system
Routines for fast swapping of data values
Read and write data of a specified endianness

Power Management

Querying power management status

1.3. What platforms does SDL run on?

Windows

Uses Win32 APIs for display, taking advantage of Direct3D for hardware acceleration
Uses DirectSound and XAudio2 for sound

Mac OS X

Uses Cocoa for video display, taking advantage of OpenGL for hardware acceleration
Uses Core Audio for sound

Linux

Uses X11 for video display, taking advantage of OpenGL for hardware acceleration
Uses the ALSA, OSS and PulseAudio APIs for sound

iOS

Uses UIKit for video display, taking advantage of OpenGL ES 2.0 for hardware acceleration
Uses Core Audio for sound

Android

Uses JNI interfaces for video display, taking advantage of OpenGL ES 1.1 and 2.0 for hardware acceleration
Uses JNI audio callbacks for sound
See also Android