I wanted to support etc1, because it shoul improve the performance and loading times, but somehow its worse than using normal png files.
I'm using Mali compression tool with seperate RBG pkm texture and Alpha pkm texture. I'm using a GLSL shader to deal with the alpha problem ofc ETC1. With the shader the performance is really bad. but even without the shader, just working with the RGB pkm file (where transparency is black) the performance is equal to png. does anyone know what the problem might be?