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README.md

iOS/Android Objective-C OpenGL sample

This is a sample demonstrating how to develop on Objective-C for both iOS and Android with help of CrystaX NDK. This is simple application which draw rotating cube and handle screen touches. Whole code is Objective-C - no Java at all.

Internal structure

This sample uses the shared sources between iOS and Android. For simplicity, all shared sources are located in common folder (of course, OpenGL shaders are shared too; they're located in shaders folder).

There are some amount of platform-specific code, which is not shared between iOS and Android (you can find it in ios and android folders); however, it's amount is small, and it's really needed since main entry points and some platform details are very different between iOS and Android.

How to build

The only supported development hosts for this example are OS X (one can build and run this sample on both iOS and Android) and GNU/Linux (one can build and run this sample on Android). This is done for simplicity of project files. Since both OS X and GNU/Linux support POSIX environment and include GNU make, it's simple to write makefile for Android project without requiring additional tools (such as Gradle).

iOS

This is simple: just open ios/opengl.xcodeproj in Xcode, build and run.

Android

To build it for Android, the following prerequisities needed:

  1. CrystaX NDK
  2. Android SDK
  3. Apache ANT

If you're on OS X and have the Homebrew, it's simple to install them all:

brew install android-sdk crystax-ndk ant

Please note, however, that CrystaX NDK should be of version 10.3.1 or higher. With Homebrew, you can check it as below:

brew info crystax-ndk

Alternatively, you can download latest daily build(darwin, linux, windows) and unpack it somewhere:

curl -OL https://dl.crystax.net/ndk/darwin/current/crystax-ndk-10.3.1-b799-darwin-x86_64.tar.xz
tar xf crystax-ndk-10.3.1-b799-darwin-x86_64.tar.xz

Now, create anroid/local.mk with settings pointing to your Android SDK and CrystaX NDK installations. You can look into android/local.mk.sample for example.

When it's done, plug your Android device by USB, cd to android folder and type there:

make run

Demo

Screen record

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