3d-guanwang/Assets/Enviro 3 - Sky and Weather/Resources/Shader/Includes/VolumetricCloudsTexInclude.cginc

UNITY_DECLARE_SCREENSPACE_TEXTURE(_MainTex);
UNITY_DECLARE_SCREENSPACE_TEXTURE(_DownsampledDepth);
UNITY_DECLARE_SCREENSPACE_TEXTURE(_CameraDepthTexture);