# Setting Up OpenGL ES 1.1 with OpenGL 2.0 on Android Emulator

=====================================================

## Introduction

-----------

Developing games and graphics-intensive applications for multiple platforms can be challenging, especially when targeting older devices that still require support for legacy APIs like OpenGL ES 1.1 while wanting to leverage the performance of newer features available in later versions such as OpenGL 2.0.

Fortunately, there are tools available to help bridge this gap without requiring a dedicated development environment or an actual Android device. In this article, we will explore how you can set up and use an OpenGL ES 1.1 emulator on your PC that maps the older API calls onto the more modern OpenGL 2.0 standard.

## What is the OpenGL ES Emulator?

--------------------------------

The OpenGL ES Emulator (formerly known as the Android NDK's glEsEmu library) is a powerful tool designed to facilitate development of applications targeting various versions and platforms with minimal effort from developers. By using this emulator, you can easily test your code on different environments without having to worry about compatibility issues or maintain multiple copies of your project.

## Setting Up OpenGL ES 1.1 Emulator

--------------------------------

### Prerequisites

* Android SDK (or NDK) installed on your PC.

* A Java Development Kit (JDK)/Java Runtime Environment (JRE) version 8 or higher.

### Steps to Setup:

1. Download and extract the latest stable release of the OpenGL ES Emulator from 'here'(https://developer.android.com/ndk/guides/gl-emu.html#download).

2. Add the following line at the beginning of your `Android.mk` file (located in your project's directory):

```make

LOCAL_CFLAGS += -D__EMSCRIPTEN__

```

3. If you're using C++:

1. In the Android Studio menu, go to Tools -> SDK Manager... or if using an older version of Eclipse, right-click on your project and select Properties -> C/C++ Build -> Toolchain-> Cross G++.

2. Under 'Compiler flags' add `-D__EMSCRIPTEN__ -Wall`.

4. Clean the project by going to `Project` > `Clean...`

### Running Your Application

Once you have set up your development environment with OpenGL ES 1.0 emulator, running an application that uses this library should be straightforward:

1. Create a new Android project in Eclipse or create an empty directory for your project if using the command line.

2. Copy and paste (or link) all necessary files from the downloaded SDK/NDK into your project's `libs` folder (for example, on Windows: `/libs/armeabi-v7a`). Make sure to include the following libraries:

- libEGL.so

- libGLESv1_emulatorclient.so

3. To run an application using the OpenGL ES Emulator:

1. If you're using Android Studio, go to Run -> Run 'YourApp' or press Shift + F9.

Alternatively,

2. If you are working with a command line environment:

- Navigate into your project directory where `AndroidManifest.xml` is located.

3. To launch the emulator:

* On Windows: run `./gradle emulators --emulator YOUR_EMULATOR_NAME`

4. You should now see an Android Virtual Device (AVD) window pop up with a virtual device running your application using OpenGL ES 1.0 API calls mapped onto the standard PC's OpenGL 2.0 drivers.

## ----------

In conclusion, by following these simple steps and utilizing tools like the OpenGL ES Emulator, you can easily test and develop graphics-intensive applications for various Android versions without having to worry about compatibility issues or maintain multiple copies of your project. This allows developers to focus on writing high-quality code rather than spending valuable time dealing with platform-specific differences.

Remember that although this emulator provides a great way to test and debug applications before releasing them onto actual devices, always remember to thoroughly test your application using the target hardware whenever possible for optimal performance and stability.

Opengl 2.0 android emulator