// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

// Upgrade NOTE: replaced 'mul(UNITY_MATRIX_MVP,*)' with 'UnityObjectToClipPos(*)'

Shader "Custom/PlantSpriteShader"
{
    Properties
    {
        [PerRendererData] _MainTex ("Sprite Texture", 2D) = "white" {}
        _Color ("Tint", Color) = (1,1,1,1)
        [MaterialToggle] PixelSnap ("Pixel snap", Float) = 0
        [HideInInspector] _RendererColor ("RendererColor", Color) = (1,1,1,1)
        [HideInInspector] _Flip ("Flip", Vector) = (1,1,1,1)
        [PerRendererData] _AlphaTex ("External Alpha", 2D) = "white" {}
        [PerRendererData] _EnableExternalAlpha ("Enable External Alpha", Float) = 0

        _ColorStrengthFactors("ColorStrengthFactors", Vector) = (0, 1, 0, 0)
        _ColorStrengthExponent("ColorStrengthExponent", Float) = 5.0
        _ColorOutFactors("ColorChangeFactors", Vector) = (10, -20, 9, 0)
        _PulsatingSpeed("PulsatingSpeed", Float) = 1.3
        _PulsatingStrength("PulsatingStrength", Float) = 0.8
    }

    SubShader
    {
        Tags
        {
            "Queue"="Transparent"
            "IgnoreProjector"="True"
            "RenderType"="Transparent"
            "PreviewType"="Plane"
            "CanUseSpriteAtlas"="True"
        }

        Cull Off
        Lighting Off
        ZWrite Off
        Blend One OneMinusSrcAlpha

        Pass
        {
        CGPROGRAM
            #pragma vertex p_SpriteVert
            #pragma fragment p_SpriteFrag
            #pragma target 2.0
            #pragma multi_compile_instancing
            #pragma multi_compile _ ETC1_EXTERNAL_ALPHA
            #pragma multi_compile EDITOR_ON EDITOR_OFF
            #include "UnitySprites.cginc"

            struct p_v2f
            {
                fixed4 color    : COLOR;
                float2 texcoord : TEXCOORD0;
                float4 clipPos : SV_POSITION;
                float2 screenPos : TEXCOORD1;
                UNITY_VERTEX_OUTPUT_STEREO
            };

            #if EDITOR_ON
                float4x4 _ToMainCameraMatrix;
                float _CorruptionCameraScaleFactor;
            #endif

            p_v2f p_SpriteVert(appdata_t IN)
            {
                p_v2f OUT;

                UNITY_SETUP_INSTANCE_ID (IN);
                UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);

                OUT.clipPos = UnityFlipSprite(IN.vertex, _Flip);
                OUT.clipPos = UnityObjectToClipPos(OUT.clipPos);
                OUT.texcoord = IN.texcoord;
                OUT.color = IN.color * _Color * _RendererColor;

                #if EDITOR_ON
                    const float2 center = (0.5, 0.5);
                    float4 screenPos = ComputeScreenPos(mul(_ToMainCameraMatrix, IN.vertex));
                    screenPos.xy = screenPos.xy / screenPos.w;
                    screenPos.xy = (screenPos.xy + center * (_CorruptionCameraScaleFactor - 1))/_CorruptionCameraScaleFactor;
                    OUT.screenPos = screenPos.xy;
                #else
                    float4 screenPos = ComputeScreenPos(UnityObjectToClipPos(IN.vertex));
                    OUT.screenPos = screenPos.xy / screenPos.w;
                #endif


                //OUT.worldPos = UnityObjectToClipPos(IN.vertex);

                return OUT;
            }

            sampler2D _CorruptionMap;
            float4 _ColorStrengthFactors;
            float _ColorStrengthExponent;
            float4 _ColorOutFactors;
            float _PulsatingSpeed;
            float _PulsatingStrength;

            fixed4 p_SpriteFrag(p_v2f IN) : SV_Target
            {
                fixed4 color = SampleSpriteTexture (IN.texcoord) * IN.color;
                float corruption = tex2D(_CorruptionMap, IN.screenPos) * 3;
                float colorstrength = dot(_ColorStrengthFactors, color);
                float colorshift = max(pow(colorstrength, _ColorStrengthExponent) * corruption * (0.5 + _PulsatingStrength / 50 * (sin(_Time[1] * _PulsatingSpeed) / 2)), 0);
                color += colorshift * _ColorOutFactors;
                color.rgb *= color.a;

                //color.rgb = UnityObjectToClipPos(IN.localPos.xyz);

                return color;
            }

            #define UnitySprites
            #ifndef UnitySprites
            // UnitySprites.cginc, for reference
#ifndef UNITY_SPRITES_INCLUDED 
#define UNITY_SPRITES_INCLUDED

#include "UnityCG.cginc"

#ifdef UNITY_INSTANCING_ENABLED

    UNITY_INSTANCING_BUFFER_START(PerDrawSprite)
        // SpriteRenderer.Color while Non-Batched/Instanced.
        UNITY_DEFINE_INSTANCED_PROP(fixed4, unity_SpriteRendererColorArray)
        // this could be smaller but that's how bit each entry is regardless of type
        UNITY_DEFINE_INSTANCED_PROP(fixed2, unity_SpriteFlipArray)
    UNITY_INSTANCING_BUFFER_END(PerDrawSprite)

    #define _RendererColor  UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteRendererColorArray)
    #define _Flip           UNITY_ACCESS_INSTANCED_PROP(PerDrawSprite, unity_SpriteFlipArray)

#endif // instancing

CBUFFER_START(UnityPerDrawSprite)
#ifndef UNITY_INSTANCING_ENABLED
    fixed4 _RendererColor;
    fixed2 _Flip;
#endif
    float _EnableExternalAlpha;
CBUFFER_END

// Material Color.
fixed4 _Color;

struct appdata_t
{
    float4 vertex   : POSITION;
    float4 color    : COLOR;
    float2 texcoord : TEXCOORD0;
    UNITY_VERTEX_INPUT_INSTANCE_ID
};

struct v2f
{
    float4 vertex   : SV_POSITION;
    fixed4 color    : COLOR;
    float2 texcoord : TEXCOORD0;
    UNITY_VERTEX_OUTPUT_STEREO
};

inline float4 UnityFlipSprite(in float3 pos, in fixed2 flip)
{
    return float4(pos.xy * flip, pos.z, 1.0);
}

v2f SpriteVert(appdata_t IN)
{
    v2f OUT;

    UNITY_SETUP_INSTANCE_ID (IN);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);

    OUT.vertex = UnityFlipSprite(IN.vertex, _Flip);
    OUT.vertex = UnityObjectToClipPos(OUT.vertex);
    OUT.texcoord = IN.texcoord;
    OUT.color = IN.color * _Color * _RendererColor;

    #ifdef PIXELSNAP_ON
    OUT.vertex = UnityPixelSnap (OUT.vertex);
    #endif

    return OUT;
}

sampler2D _MainTex;
sampler2D _AlphaTex;

fixed4 SampleSpriteTexture (float2 uv)
{
    fixed4 color = tex2D (_MainTex, uv);

#if ETC1_EXTERNAL_ALPHA
    fixed4 alpha = tex2D (_AlphaTex, uv);
    color.a = lerp (color.a, alpha.r, _EnableExternalAlpha);
#endif

    return color;
}

fixed4 SpriteFrag(v2f IN) : SV_Target
{
    fixed4 c = SampleSpriteTexture (IN.texcoord) * IN.color;
    c.rgb *= c.a;
    return c;
}

#endif // UNITY_SPRITES_INCLUDED
            #endif // UNITY_SPRITES
        ENDCG
        }
    }
}