Posted by fifty on Mar 12, 2014; 4:48pm
URL: https://forum.jogamp.org/JOCL-texture-generation-tp4031853p4031870.html

Thanks! I can upload my small test program for copying an CL image to an GL RGBA texture.

I could make the host copy work now. The problem was not with the copy but with preparing the VBO
for rendering the textured quad!!!

    
    private ByteBuffer clone (float[] data)
    {
	int         len    = data.length;
	ByteBuffer  direct = ByteBuffer.allocateDirect(len*4);
	direct.order(ByteOrder.nativeOrder()); // very important!
	for (int i=0; i<len; ++i) {
	    direct.putFloat(data[i]);
	}
	direct.rewind();
	return direct;
    }

I left out the direct.order call on the ByteBuffer.
I am not sure, if there is a util function for this task!

Still, I could not make the GL texture object sharing work.
clContext2.createFromGLTexture2d gives me an exception:

Exception in thread "AWT-EventQueue-0" com.jogamp.opencl.CLException: unknown ca
use: code 201779856 [error: unknown]
        at com.jogamp.opencl.CLException.checkForError(CLException.java:67)
        at com.jogamp.opencl.gl.CLGLTexture2d.createFromGLTexture2d(CLGLTexture2
d.java:66)
        at com.jogamp.opencl.gl.CLGLContext.createFromGLTexture2d(CLGLContext.ja
va:284)
        at com.jogamp.opencl.gl.CLGLContext.createFromGLTexture2d(CLGLContext.ja
va:272)
        at DemoViewer.initCL(DemoViewer.java:334)
        at DemoViewer.init(DemoViewer.java:193)