CODEWITHSUNDEEP
javaandroidopengl-es
Kleptine
Kleptine

Reputation: 5085

Quickly Updating OpenGL Textures

The Android app I'm developing needs to render a few large bitmaps that are being updated continuously every frame. For the past year I rendered them through SurfaceView and Canvas, but now with the huge screen size of the Galaxy Nexus, drawing a large bitmap is extremely slow.

I'm making attempts to swap the rendering to openGL, but I can't update the textures fast enough each frame. At the moment I'm using glTexSubImage2d() to copy the bitmap data into a texture every frame, but this is much too slow. I've searched around a bit and apparently glCopyTexSubImage is somewhat faster, but the Android implementation doesn't accept a data parameter.

Any suggestions how I might be able to render dynamic textures without lag?

Upvotes: 0

Views: 1640

Answers (1)

miha
miha

Reputation: 3377

I'm not sure this answers your question, but the way I'm doing it is I have a framebuffer allocated in C/C++ and pass this to java via ByteBuffer (jni->NewDirectByteBuffer()). I'm using this as a texture and it works fast and fine. Then, I can modify this framebuffer directly in C/C++ and the changes are visible immedialty after render is performed on the OpenGL sufrace. I'm currently having problems with ICS Galaxy Nexus, as it does not apply the texture correctly if the texture exceeds 2048x2048 pixels. I'm assuming the error is related to hardware constrains of the device, but I am still doing some testing.

Upvotes: 0

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