I couldn’t test the code yet (but I will, looks really interesting). One thing that caught my attention is that you don’t seem to filter the sensor data in any way. Sensor readings are very noisy by nature, specially the magnetic sensor. I’d suggest you implement some low pass filtering. See my previous answer for … Read more
In the most general sense, no. OpenGL and Direct3D only allow one index per vertex; the index fetches from each stream of vertex data. Therefore, every unique combination of components must have its own separate index. So if you have a cube, where each face has its own normal, you will need to replicate the … Read more
As of iOS 5.0, there is now a faster way to grab data from OpenGL ES. It isn’t readily apparent, but it turns out that the texture cache support added in iOS 5.0 doesn’t just work for fast upload of camera frames to OpenGL ES, but it can be used in reverse to get quick … Read more
“tableview from which I go to openglView” – this statement combined with usage of affine transform suggest that you are not using standard navigation and try to move views and use Autolayout simultaneously. This crash is related to the contrary set of constraints, I guess you are applying affine transform and thus mess up with … Read more
This determines how much precision the GPU uses when calculating floats. highp is high precision, and of course more intensive than mediump (medium precision) and lowp (low precision). Some systems do not support highp at all, which will cause code not to work at all on those systems. On systems that DO support highp, you … Read more
How to do it nowadays: Since this is one of the most famous questions on libgdx here, I’ll give it a little update: LibGDX v1.0 introduced Viewport to handle this problem. It is a lot easier to use and the scaling strategy is pluggable, which means a single line can change the behaviour and you … Read more
A quick search using… apt search Xlib.h Turns up the package libx11-dev but you shouldn’t need this for pure OpenGL programming. What tutorial are you using? You can add Xlib.h to your system by running the following… sudo apt install libx11-dev
I know one good reason to prefer explicit location definition. Consider that you hold your geometry data in Vertex Array Objects. For a given object, you create a VAO in such way that the indices correspond to, for example: index 0: positions, index 1: normals, index 2: texcoords Now consider that you want to draw … Read more
I was in a similar situation. The way I started with openGL with start by looking at the very basic GLSurfaceView samples/demos. Start, by setting up your app activity, and set up the basic canvas. Take a loot at the replica island source code file: GameRenderer.java for how to setup your canvas with the proper … Read more
Two of the more significant differences between OpenGL ES and OpenGL are the removal of the glBegin … glEnd calling semantics for primitive rendering (in favor of vertex arrays) and the introduction of fixed-point data types for vertex coordinates and attributes to better support the computational abilities of embedded processors, which often lack an FPU … Read more