[Libgdx] how to use GLES20

Newbie & Debugging Questions
#1

Trying to do a little demo game, which would be ran on desktop and android. The problem is that when I try to run the game on android emulator, I get OpenGL ES 2.0 is not supported on your device error in logcat. I’m using eclipse. I did some googling and found that I need to put this code into my manifest file:


 <uses-feature android:glEsVersion="0x00020000" android:required="true" />

Now my manifest file looks like this, but I still get the same error.


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.cig.dreams.android"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="8" android:targetSdkVersion="19" />
	<uses-feature android:glEsVersion="0x00020000" android:required="true" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/GdxTheme" >
        <activity
            android:name="com.cig.dreams.android.AndroidLauncher"
            android:label="@string/app_name" 
            android:screenOrientation="landscape"
            android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Any suggestions? (I’m going to sleep in a few minutes, so don’t expect me to reply for 8 hours.)

#2

IIRC in order to use GLES20 in the emulator you have to check the option “use host GPU” or something like that.

#3

Thanks it seems it fixed the problem. However now I’m getting probably file doesn’t exist exception when doing ImageIO.read(Gdx.files.internal(“file”).read());

Probably my fault somewhere :stuck_out_tongue:

#4

Okey I’m starting to get annoyed by this…


		Gdx2DPixmap pixmap;
		System.out.println(pixmap.getPixel(0, 0));
		pixmap.setPixel(0, 0, 0);
		System.out.println(pixmap.getPixel(0, 0));

I finally come to write this code. The problem is that here is what it prints out.

1915447807
1915447807

I basically load the pixmap somewhere in the code and value at 0,0 happens to be 1915447807. The problem is that it doesn’t change after I do setPixel(0, 0, 0). In second print statement, it should be 0, but it didn’t change. Do I need to call some kind of method like pixmap.flush or pixmap.update for it to change?

#5

I’m not sure but try if with setPixel(0, 0, Color.rgba8888(0,0,0,1)); works.

#6

I think the problem lies with the formats. When loading .png, I think you get like a format where alpha can be 1 or 0, meaning alpha is full or there is no alpha.

I think I need to first of all convert the pixmap from RGB888 to RGBA8888 format somehow.