/*
 *  The MIT License
 *
 *  Copyright 2018 whiteflare.
 *
 *  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"),
 *  to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
 *  and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 *  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 *  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 *  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 *  TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
Shader "UnlitWF/WF_MatcapShadows_Transparent3Pass" {

    /*
     * authors:
     *      ver:2018/09/25 whiteflare,
     */

    Properties {
        // 基本
        [Header(Base)]
            _MainTex        ("Main Texture", 2D) = "white" {}
            _SolidColor     ("Solid Color", Color) = (0, 0, 0, 0)
        [Toggle(_GL_ENABLE)]
            _GL_Enable      ("Anti-Glare", Float) = 0

        // Alpha
        [Header(Transparent Alpha)]
        [KeywordEnum(MAIN_TEX_ALPHA,MASK_TEX_RED,MASK_TEX_ALPHA)]
            _AL_SOURCE      ("[AL] Alpha Source", Float) = 0
        [NoScaleOffset]
            _AL_MaskTex     ("[AL] Alpha Mask Texture", 2D) = "white" {}
            _AL_Power       ("[AL] Power", Range(0, 2)) = 1.0
            _AL_CutOff      ("[AL] Cutoff Threshold", Range(0, 1)) = 0.9
        [Enum(OFF,0,ON,1)]
            _AL_ZWrite      ("[AL] ZWrite", int) = 0

        // 法線マップ
        [Header(NormalMap)]
        [Toggle(_NM_ENABLE)]
            _NM_Enable      ("[NM] Enable", Float) = 0
        [NoScaleOffset]
            _BumpMap        ("[NM] NormalMap Texture", 2D) = "bump" {}
            _NM_Power       ("[NM] Shadow Power", Range(0, 1)) = 0.25

        // Matcapハイライト
        [Header(HighLight and Shadow Matcap)]
        [Toggle(_HL_ENABLE)]
            _HL_Enable      ("[HL] Enable", Float) = 0
        [NoScaleOffset]
            _HL_MatcapTex   ("[HL] Matcap Sampler", 2D) = "black" {}
            _HL_MedianColor ("[HL] Median Color", Color) = (0.5, 0.5, 0.5, 1)
            _HL_Range       ("[HL] Matcap Range (Tweak)", Range(0, 2)) = 1
            _HL_Power       ("[HL] Power", Range(0, 2)) = 1
        [NoScaleOffset]
            _HL_MaskTex     ("[HL] Mask Texture", 2D) = "white" {}

        // Overlay Texture
        [Header(Overlay Texture)]
        [Toggle(_OL_ENABLE)]
            _OL_Enable      ("[OL] Enable", Float) = 0
            _OL_OverlayTex  ("[OL] Texture", 2D) = "white" {}
        [KeywordEnum(ALPHA,ADD,MUL)]
            _OL_BLENDTYPE   ("[OL] Blend Type", Float) = 0
            _OL_Power       ("[OL] Blend Power", Range(0, 1)) = 1
            _OL_Scroll_U    ("[OL] U Scroll", Float) = 0
            _OL_Scroll_V    ("[OL] V Scroll", Float) = 0

        // EmissiveScroll
        [Header(Emissive Scroll)]
        [Toggle(_ES_ENABLE)]
            _ES_Enable      ("[ES] Enable", Float) = 0
        [HDR]
            _ES_Color       ("[ES] Emissive Color", Color) = (1, 1, 1, 1)
        [NoScaleOffset]
            _ES_MaskTex     ("[ES] Mask Texture", 2D) = "white" {}
            _ES_Direction   ("[ES] Direction", Vector) = (0, -2, 0, 0)
            _ES_LevelOffset ("[ES] LevelOffset", Range(-1, 1)) = 0
            _ES_Sharpness   ("[ES] Sharpness", Range(0, 4)) = 2
            _ES_Speed       ("[ES] ScrollSpeed", Range(0, 8)) = 1
    }

    SubShader {
        Tags {
            "RenderType" = "Transparent"
            "Queue" = "AlphaTest"
            "LightMode" = "ForwardBase"
            "IgnoreProjector" = "True"
            "DisableBatching" = "True"
        }
        LOD 100

        Pass {
            Cull OFF
            Blend Off

            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag_cutoff

            #pragma target 3.0
            #pragma shader_feature _GL_ENABLE
            #pragma shader_feature _AL_SOURCE_MAIN_TEX_ALPHA _AL_SOURCE_MASK_TEX_RED _AL_SOURCE_MASK_TEX_ALPHA
            #pragma shader_feature _NM_ENABLE
            #pragma shader_feature _HL_ENABLE
            #pragma shader_feature _OL_ENABLE
            #pragma shader_feature _OL_BLENDTYPE_ALPHA _OL_BLENDTYPE_ADD _OL_BLENDTYPE_MUL
            #pragma shader_feature _ES_ENABLE
            #pragma multi_compile_fwdbase
            #pragma multi_compile_fog

            #include "UnityCG.cginc"
            #include "Lighting.cginc"
            #include "WF_MatcapShadows.cginc"

            ENDCG
        }

        Tags {
            "RenderType" = "Transparent"
            "Queue" = "Transparent"
            "LightMode" = "ForwardBase"
            "IgnoreProjector" = "True"
            "DisableBatching" = "True"
        }

        Pass {
            Cull FRONT
            Blend SrcAlpha OneMinusSrcAlpha

            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag_clip

            #pragma target 3.0
            #pragma shader_feature _GL_ENABLE
            #pragma shader_feature _AL_SOURCE_MAIN_TEX_ALPHA _AL_SOURCE_MASK_TEX_RED _AL_SOURCE_MASK_TEX_ALPHA
            #pragma shader_feature _NM_ENABLE
            #pragma shader_feature _HL_ENABLE
            #pragma shader_feature _OL_ENABLE
            #pragma shader_feature _OL_BLENDTYPE_ALPHA _OL_BLENDTYPE_ADD _OL_BLENDTYPE_MUL
            #pragma shader_feature _ES_ENABLE
            #pragma multi_compile_fwdbase
            #pragma multi_compile_fog

            #include "UnityCG.cginc"
            #include "Lighting.cginc"
            #include "WF_MatcapShadows.cginc"

            fixed4 frag_clip(v2f i, float facing : VFACE) : SV_Target {
                float4 color = frag_baseonly(i);
                clip(_AL_CutOff - color.a);
                return color;
            }

            ENDCG
        }

        Pass {
            Cull BACK
            Blend SrcAlpha OneMinusSrcAlpha

            CGPROGRAM

            #pragma vertex vert
            #pragma fragment frag_clip

            #pragma target 3.0
            #pragma shader_feature _GL_ENABLE
            #pragma shader_feature _AL_SOURCE_MAIN_TEX_ALPHA _AL_SOURCE_MASK_TEX_RED _AL_SOURCE_MASK_TEX_ALPHA
            #pragma shader_feature _NM_ENABLE
            #pragma shader_feature _HL_ENABLE
            #pragma shader_feature _OL_ENABLE
            #pragma shader_feature _OL_BLENDTYPE_ALPHA _OL_BLENDTYPE_ADD _OL_BLENDTYPE_MUL
            #pragma shader_feature _ES_ENABLE
            #pragma multi_compile_fwdbase
            #pragma multi_compile_fog

            #include "UnityCG.cginc"
            #include "Lighting.cginc"
            #include "WF_MatcapShadows.cginc"

            fixed4 frag_clip(v2f i, float facing : VFACE) : SV_Target {
                float4 color = frag(i, facing);
                clip(_AL_CutOff - color.a);
                return color;
            }

            ENDCG
        }
    }
}