The main reason is performance: ByteBuffers and the other NIO classes enable accelerated operations when interfacing with native code (typically by avoiding the need to copy data into a temporary buffer). This is pretty important if you are doing a lot of OpenGL rendering calls for example. The reason for creating a ByteBuffer first is … Read more
NO! Never do this! When declaring UBOs/SSBOs, pretend that all 3-element vector types don’t exist. This includes column-major matrices with 3 rows or row-major matrices with 3 columns. Pretend that the only types are scalars, 2, and 4 element vectors (and matrices). You will save yourself a very great deal of grief if you do … Read more
This happens to me when my computer came out standby. Restart your virtual device.
Once again, if I may plug my own work, I have written a post about the things I’ve learned from developing an OpenGL ES application on the iPhone. That application, Molecules (referred to by frankodwyer), is open source and I have a writeup on some of the other tricky issues I ran into while developing … Read more
There are mainly four texture compression types supported on Android: ETC1 (Ericsson texture compression). This format is supported by all Android phones. But, it doesn’t support an alpha channel, so can only be used for opaque textures. PVRTC (PowerVR texture compression). Supported by devices with PowerVR GPUs (Nexus S, Kindle fire, etc.). ATITC (ATI texture … Read more
Long story short There is no subtract color blending out of the box in the Android SDK, however you still can make it work with use of OpenGL rendering API. Here you can find the implementation of such a solution, incapsulated in the BlendingFilterUtil class, which can be used like this: BlendingFilterUtil.subtractMatrixColorFilter(bitmap, new float[]{ 0.393f, … Read more
I just added filters to my open source GPUImage framework that perform three of the four processing tasks you describe (swirling, sketch filtering, and converting to an oil painting). While I don’t yet have colorspace transforms as filters, I do have the ability to apply a matrix to transform colors. As examples of these filters … Read more
That’s where I got to: I’ve used Google’s APIDemos as a starting point – there are rotating cubes in there, each specified by two arrays: vertices and indices. I’ve build my model using Blender and exported it as OFF file – it’s a text file that lists all the vertices and then faces in terms … Read more
Here’s how I have my GLSurfaceView setup in a fragment: onCreateView() { glSurfaceView = new GLSurfaceView(getActivity()); … } onPause() { if (glSurfaceView != null) { glSurfaceView.onPause(); } … } onResume() { if (glSurfaceView != null) { glSurfaceView.onResume(); } … } } So, similar to what you’d do in an activity. This works in my use … Read more
My answer is going to about displaying vector graphics wtih OpenGL in general, because all solutions for this problem can support rather trivially SVG in particular, although none support animated SVGs (SMIL). Since there was nothing said about animation, I assume the question implied static SVGs only. First, I would not bother with anything OpenVG, … Read more