#ifndef CC_SURFACES_FRAGMENT_MODIFY_BASECOLOR_AND_TRANSPARENCY
// depends on CC_SURFACES_FRAGMENT_MODIFY_BASECOLOR_AND_TRANSPARENCY
vec4 SurfacesFragmentModifyBaseColorAndTransparency()
{
    return FSInput_vertexColor;
}
#endif

#ifndef CC_SURFACES_FRAGMENT_ALPHA_CLIP_ONLY
// depends on CC_SURFACES_FRAGMENT_ALPHA_CLIP_ONLY
// for base shape without color usage, such as render-to-shadow
void SurfacesFragmentAlphaClipOnly()
{
}
#endif

#ifndef CC_SURFACES_FRAGMENT_MODIFY_SHARED_DATA
// depends on CC_SURFACES_FRAGMENT_MODIFY_SHARED_DATA
// some material datas use shared raw data, avoid sample / calculate same raw data multiply times, use this function for better performance
// this function invokes at last
// should use corresponding shading-model header: #include <surfaces/data-structures/XXX> before function define
void SurfacesFragmentModifySharedData(inout SurfacesMaterialData surfaceData)
{
}
#endif