#pragma target 2.0

#include "UnityCG.cginc"
#include "UnityUI.cginc"

#pragma multi_compile_local _ UNITY_UI_CLIP_RECT
#pragma multi_compile_local _ UNITY_UI_ALPHACLIP

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;
    float4 worldPosition : TEXCOORD1;
    UNITY_VERTEX_OUTPUT_STEREO
};

sampler2D _MainTex;
fixed4 _TextureSampleAdd;
float4 _ClipRect;
float4 _MainTex_ST;

v2f vert(appdata_t v)
{
    v2f OUT;
    UNITY_SETUP_INSTANCE_ID(v);
    UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(OUT);
    OUT.worldPosition = v.vertex;
    OUT.vertex = UnityObjectToClipPos(OUT.worldPosition);
    OUT.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);
    OUT.color.a = v.color.a;
    OUT.color.rgb = v.color.rgb * v.color.a;

    return OUT;
}

fixed4 frag(v2f IN) : SV_Target
{
    float4 color = (tex2D(_MainTex, IN.texcoord) + _TextureSampleAdd) * IN.color;

    #ifdef UNITY_UI_CLIP_RECT
    color.a *= UnityGet2DClipping(IN.worldPosition.xy, _ClipRect);
    #endif

    #ifdef UNITY_UI_ALPHACLIP
    clip (color.a - 0.001);
    #endif

    #ifdef DO_BLEND_POSTPROCESS
    DO_BLEND_POSTPROCESS
    #endif

    return color;
}