public final class EnvironmentMaps

Bakes the environment map that image based lighting reads (Environment.setEnvironmentMap): what a shiny or rough surface reflects, and the soft light every surface receives from all around it.

The bake runs once, on the CPU, into an ordinary RGB texture every backend samples the same way – no cube maps and no float textures, so it works on the oldest GL ES and WebGL devices too. The texture is WIDTH texels wide and holds BANDS equirectangular bands of BAND_HEIGHT texels stacked top to bottom: the sharp environment, three progressively blurred copies for rougher surfaces, the roughest, and last the diffuse irradiance. Colours are stored at half intensity, so an environment may be up to twice as bright as white.

import com.codename1.gpu.*;
import com.codename1.gpu.shaders.ScenePresets;

void light(GraphicsDevice device, ScenePresets.Preset look, Light light) {
    Environment env = look.getEnvironment();
    env.setEnvironmentMap(EnvironmentMaps.fromSky(device, env, light));
}

Rebake when the sky changes; a bake costs a few tens of milliseconds.