ScriptableRenderPipeline/ScriptableRenderPipeline/HDRenderPipeline/Sky/SkyRenderer.cs

namespace UnityEngine.Experimental.Rendering.HDPipeline
{
    public abstract class SkyRenderer
    {
        public abstract void Build();
        public abstract void Cleanup();
        public abstract void SetRenderTargets(BuiltinSkyParameters builtinParams);
        // renderForCubemap: When rendering into a cube map, no depth buffer is available so user has to make sure not to use depth testing or the depth texture.
        public abstract void RenderSky(BuiltinSkyParameters builtinParams, bool renderForCubemap);
        public abstract bool IsSkyValid();
    }
}