On Oct 10, 2012, at 1:36 AM, renan jegouzo <[email protected]> wrote:
> when I try to get the current EGL display, using
> EGLContext.EGL11.EglGetCurrentDisplay ()
>
> I got an exception:
> System.Exception: Unable to convert instance of type
> 'com/google/android/gles_jni/EGLImpl' to type
> 'javax.microedition.khronos.egl.EGL11'
>
> how I can get the current EGL display ?
Your device doesn't support the IEGL11 interface; you should use EGLContext.EGL
instead.
The problem is that com.google.android.gles_jni.EGLImpl is returned by
EGLContext.getEGL:
https://github.com/android/platform_frameworks_base/blob/master/opengl/java/javax/microedition/khronos/egl/EGLContext.java
and EGLImpl only implements the EGL10 interface, not the EGL11 interface:
https://github.com/android/platform_frameworks_base/blob/master/opengl/java/com/google/android/gles_jni/EGLImpl.java
Consequently, the EGLContext.EGL11 helper fails, as the runtime Java type
doesn't implement the EGL11 interface.
The workaround is to use the EGL10 interface, which EGLImpl does implement:
var egl10 = EGLContext.EGL.JavaCast<IEGL10>();
var display = egl10.EglGetCurrentDisplay();
(The really odd thing is that I remember EGLContext.EGL11 previously working,
so it looks like Android has changed things so that only EGL10 is supported...)
- Jon
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