//    Copyright (C) 2020 NedMakesGames

//    This program is free software: you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation, either version 3 of the License, or
//    (at your option) any later version.

//    This program is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//    GNU General Public License for more details.

//    You should have received a copy of the GNU General Public License
//    along with this program. If not, see <https://www.gnu.org/licenses/>.

// This is the Lighting.hlsl file for early parts of the tutorial

#ifndef CUSTOM_LIGHTING_INCLUDED
#define CUSTOM_LIGHTING_INCLUDED

void CalculateMainLight_float(float3 WorldPos, out float3 Direction, out float3 Color, 
        out half DistanceAtten, out half ShadowAtten) {
#if SHADERGRAPH_PREVIEW
    Direction = half3(0.5, 0.5, 0);
    Color = 1;
    DistanceAtten = 1;
    ShadowAtten = 1;
#else
    #if SHADOWS_SCREEN
        half4 clipPos = TransformWorldToHClip(WorldPos);
        half4 shadowCoord = ComputeScreenPos(clipPos);
    #else
        half4 shadowCoord = TransformWorldToShadowCoord(WorldPos);
    #endif
    Light mainLight = GetMainLight(shadowCoord);
    Direction = mainLight.direction;
    Color = mainLight.color;
    DistanceAtten = mainLight.distanceAttenuation;
    ShadowAtten = mainLight.shadowAttenuation;
#endif
}

#endif