Shader "Experim/StdShader"
{
    Properties
    {
        _Color("Color", Color) = (1,1,1,1)
        _MainTex("Albedo", 2D) = "white" {}

        _Cutoff("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

        _Glossiness("Smoothness", Range(0.0, 1.0)) = 0.5
        _GlossMapScale("Smoothness Scale", Range(0.0, 1.0)) = 1.0
        [Enum(Metallic Alpha,0,Albedo Alpha,1)] _SmoothnessTextureChannel ("Smoothness texture channel", Float) = 0

        [Gamma] _Metallic("Metallic", Range(0.0, 1.0)) = 0.0
        _MetallicGlossMap("Metallic", 2D) = "white" {}

        [ToggleOff] _SpecularHighlights("Specular Highlights", Float) = 1.0
        [ToggleOff] _GlossyReflections("Glossy Reflections", Float) = 1.0

        _BumpScale("Scale", Float) = 1.0
        _BumpMap("Normal Map", 2D) = "bump" {}

        _Parallax ("Height Scale", Range (0.005, 0.08)) = 0.02
        _ParallaxMap ("Height Map", 2D) = "black" {}

        _OcclusionStrength("Strength", Range(0.0, 1.0)) = 1.0
        _OcclusionMap("Occlusion", 2D) = "white" {}

        _EmissionColor("Color", Color) = (0,0,0)
        _EmissionMap("Emission", 2D) = "white" {}

        _DetailMask("Detail Mask", 2D) = "white" {}

        _DetailAlbedoMap("Detail Albedo x2", 2D) = "grey" {}
        _DetailNormalMapScale("Scale", Float) = 1.0
        _DetailNormalMap("Normal Map", 2D) = "bump" {}

        [Enum(UV0,0,UV1,1)] _UVSec ("UV Set for secondary textures", Float) = 0


        // Blending state
        [HideInInspector] _Mode ("__mode", Float) = 0.0
        [HideInInspector] _SrcBlend ("__src", Float) = 1.0
        [HideInInspector] _DstBlend ("__dst", Float) = 0.0
        [HideInInspector] _ZWrite ("__zw", Float) = 1.0
    }

    CGINCLUDE
        #define UNITY_SETUP_BRDF_INPUT MetallicSetup
    ENDCG

    SubShader
    {
        Tags { "RenderType" = "Opaque" "PerformanceChecks" = "False" }
        LOD 300


        // ------------------------------------------------------------------
        //  Forward pass
        Pass
        {
            Name "FORWARD"
            Tags { "LightMode" = "ForwardSinglePass" }

            Blend [_SrcBlend] [_DstBlend]
            ZWrite [_ZWrite]

            CGPROGRAM
            #pragma target 4.5

            // -------------------------------------

            #pragma shader_feature _NORMALMAP
            #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON
            #pragma shader_feature _EMISSION
            #pragma shader_feature _METALLICGLOSSMAP
            #pragma shader_feature ___ _DETAIL_MULX2
            #pragma shader_feature _ _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
            #pragma shader_feature _ _SPECULARHIGHLIGHTS_OFF
            #pragma shader_feature _ _GLOSSYREFLECTIONS_OFF
            #pragma shader_feature _PARALLAXMAP

            #pragma multi_compile _ LIGHTMAP_ON
            #pragma multi_compile _ DIRLIGHTMAP_COMBINED DIRLIGHTMAP_SEPARATE
            #pragma multi_compile _ DYNAMICLIGHTMAP_ON
            #pragma multi_compile_fog
            #pragma multi_compile TILED_FORWARD REGULAR_FORWARD

            #pragma vertex vertForward
            #pragma fragment fragForward

            #include "UnityStandardForwardNew.cginc"


            ENDCG
        }

        // ------------------------------------------------------------------
        //  Depth Only
        Pass
        {
            Name "DEPTHONLY"
            Tags { "LightMode" = "DepthOnly" }

            Blend [_SrcBlend] [_DstBlend]
            //ZWrite [_ZWrite]
            ZWrite On ZTest LEqual

            CGPROGRAM
            #pragma target 4.5

            // TODO: figure out what's needed here wrt. alpha test etc.

            #pragma shader_feature _NORMALMAP
            #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON
            #pragma shader_feature _EMISSION
            #pragma shader_feature _METALLICGLOSSMAP
            #pragma shader_feature ___ _DETAIL_MULX2
            #pragma shader_feature _ _SMOOTHNESS_TEXTURE_ALBEDO_CHANNEL_A
            #pragma shader_feature _ _SPECULARHIGHLIGHTS_OFF
            #pragma shader_feature _ _GLOSSYREFLECTIONS_OFF
            #pragma shader_feature _PARALLAXMAP

            #pragma multi_compile _ LIGHTMAP_ON
            #pragma multi_compile _ DIRLIGHTMAP_COMBINED DIRLIGHTMAP_SEPARATE
            #pragma multi_compile _ DYNAMICLIGHTMAP_ON
            #pragma multi_compile_fog

            #pragma vertex vertForward
            #pragma fragment fragNoLight

            #include "UnityStandardForwardNew.cginc"


            ENDCG
        }


        // ------------------------------------------------------------------
        //  Shadow rendering pass
        Pass {
            Name "ShadowCaster"
            Tags { "LightMode" = "ShadowCaster" }

            ZWrite On ZTest LEqual

            CGPROGRAM
            #pragma target 4.5

            // -------------------------------------


            #pragma shader_feature _ _ALPHATEST_ON _ALPHABLEND_ON _ALPHAPREMULTIPLY_ON
            #pragma shader_feature _METALLICGLOSSMAP
            #pragma multi_compile_shadowcaster

            #pragma vertex vertShadowCaster
            #pragma fragment fragShadowCaster

            #include "UnityStandardShadow.cginc"

            ENDCG
        }
        // ------------------------------------------------------------------
        //  Deferred pass

    }


    FallBack "VertexLit"
    CustomEditor "StandardShaderGUI"
}