Shader "R1/Scene/Scene_DiffuseBump_Clip" {
    Properties {
        [NoScaleOffset]_MainTex ("主帖图", 2D) = "white" {}
        [NoScaleOffset]_FunctionMap("法线贴图", 2D) = "black" {}
        _Clip("裁剪范围",Range(0 , 1)) = 0.5
        _Emmision("自发光强度", Range(0, 5)) = 0
        [HDR]_EmmisionColor("自发光颜色",Color) = (1,1,1,0)
        [Space(40)]
        [Header(Use vertex color control animation)]
        [Space]
        [Toggle(_WIND_ON)]_windOn("开启顶点动画",float) = 0
        _Frequency("摇晃频率", Range(0 , 1)) = 0.2
        _Strength("摇晃幅度", Range(0 , 1)) = 0.2
        _Scale("摇晃范围",Range(0 , 5)) = 1
        [Toggle] _ZWrite("写入深度", Float) = 1
    }
    SubShader 
    {
        Tags {"RenderType" = "TransparentCutout"  "Queue" = "AlphaTest"}

        CGINCLUDE
        #pragma multi_compile __ _WIND_ON
        uniform sampler2D _MainTex;
        uniform float _Clip;
        uniform fixed4 _EmmisionColor;
        ENDCG

        Pass {
            Tags {"LightMode" = "ForwardBase"}
            Cull Off
            ZWrite [_ZWrite]

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma target 3.0
            #pragma skip_variants LIGHTPROBE_SH LIGHTMAP_ON DYNAMICLIGHTMAP_ON  DIRLIGHTMAP_COMBINED LIGHTMAP_SHADOW_MIXING SHADOWS_SHADOWMASK VERTEXLIGHT_ON

            #pragma multi_compile_instancing
            #pragma multi_compile_fwdbase
            #pragma multi_compile_fog
            #pragma multi_compile __ _USEPOINTLIGHT_ON

            #include "UnityCG.cginc"
            #include "AutoLight.cginc"
            #include "Lighting.cginc"
            #include "CloudInclude.cginc"
            #include "DiffuseInclude.cginc"
            #include "SideInclude.cginc"
            #ifdef _USEPOINTLIGHT_ON
                #include "PointlightInclude.cginc"
            #endif
            #ifdef _WIND_ON
                #include "NoiseInclude.cginc"
            #endif
            uniform sampler2D _FunctionMap;
            uniform float _Emmision;

            VertexOutput vert (VertexInput v) {
                VertexOutput o = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(v);
                //UNITY_TRANSFER_INSTANCE_ID(v, o);
                o.uv.xy = v.uv;
                o.normalDir.xyz = normalize(UnityObjectToWorldNormal(v.normal));
                o.tangentDir = normalize(mul(unity_ObjectToWorld, v.tangent.xyz).xyz);
                o.bitangentDir = normalize(cross(o.normalDir, o.tangentDir) * v.tangent.w);
                o.posWorld = mul(unity_ObjectToWorld, v.vertex);
                //风
                #ifdef _WIND_ON
                    v.vertex.xyz += FinalPerlin(v.vertex,v.color,_Time.y);//风，有include
                #endif
                o.pos = UnityObjectToClipPos(v.vertex);
                o.uv.zw = 0;//没有用到的分量
                UNITY_TRANSFER_FOG(o,o.pos);
                TRANSFER_VERTEX_TO_FRAGMENT(o)
                return o;
            }

            float4 frag(VertexOutput i) : COLOR{
                //UNITY_SETUP_INSTANCE_ID(i);
                fixed2 _uv = i.uv.xy;//UV
                fixed4 _mainTex = tex2D(_MainTex, _uv);//采样主帖图
                fixed4 _normalTex = tex2D(_FunctionMap, _uv);//采样法线贴图
                fixed3 _normalMap = UnpackNormal(_normalTex);//解包法线
                float3x3 _tangentTransform = float3x3(i.tangentDir, i.bitangentDir, i.normalDir.xyz);//切线空间到世界空间矩阵
                _normalMap = normalize(mul(_normalMap, _tangentTransform));//法线转到世界空间
                _normalMap = _normalTex.x != 0 ? _normalMap : i.normalDir;//如果没有法线贴图，则使用模型自身法线
                fixed3 _finalRGB = Diffuse(_normalMap,_mainTex,i);//光照，有include
                _finalRGB *= _mainTex.rgb;//乘以主帖图
                fixed3 _emission = _mainTex.rgb * _Emmision * _normalTex.a;//自发光，基于主帖图颜色
                _finalRGB += _emission;//输出颜色加上自发光
                _finalRGB = AddCloud(i.posWorld,_uv,_finalRGB);//云投影，有include
                _finalRGB *= _EmmisionColor;
                //点光源，有include
                #ifdef _USEPOINTLIGHT_ON
                    _finalRGB +=  PointLight(_normalMap,i.posWorld);
                #endif
                UNITY_APPLY_FOG(i.fogCoord, _finalRGB);//雾
                //_finalRGB = AddSide(i.posWorld.xz, _finalRGB);//暗边
                clip(_mainTex.a - _Clip);//裁剪

                return fixed4(_finalRGB,1);
            }
            ENDCG
        }
        //shadow
        Pass
        {
            Name "ShadowCaster"
            Tags { "LightMode" = "ShadowCaster" }
            
            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag
            #pragma target 2.0
            #pragma multi_compile_shadowcaster
            #pragma multi_compile_instancing 

            #include "UnityCG.cginc"
            #ifdef _WIND_ON
                #include "NoiseInclude.cginc"
            #endif

            struct VertexInput {
                float4 vertex : POSITION;
                float2 uv : TEXCOORD0;
                float4 color : COLOR;
                UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            struct VertexOutput {
                V2F_SHADOW_CASTER;
                float2 uv : TEXCOORD1;
                //UNITY_VERTEX_INPUT_INSTANCE_ID
            };

            VertexOutput vert(VertexInput v)
            {
                VertexOutput o = (VertexOutput)0;
                UNITY_SETUP_INSTANCE_ID(v);
                //UNITY_TRANSFER_INSTANCE_ID(v, o);
                o.uv = v.uv.xy;
                //风
                #ifdef _WIND_ON
                    v.vertex.xyz += FinalPerlin(v.vertex,v.color,_Time.y);//风，有include
                #endif
                TRANSFER_SHADOW_CASTER(o)
                return o;
            }

            float4 frag(VertexOutput i) : SV_Target
            {
                //UNITY_SETUP_INSTANCE_ID(i);
                float4 _mainTex = tex2D(_MainTex, i.uv);
                clip(_mainTex.a - _Clip);
                SHADOW_CASTER_FRAGMENT(i)
            }
            ENDCG
        }
    }
}