// Unity built-in shader source. Copyright (c) 2016 Unity Technologies. MIT license (see license.txt)

// Unlit alpha-blended shader.
// - no lighting
// - no lightmap support
// - no per-material color

Shader "Azure[Sky]/BuiltIn/Unlit/Transparent"
{
	Properties
	{
		_MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
	}

	SubShader
	{
		Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
		LOD 100

		ZWrite Off
		Blend SrcAlpha OneMinusSrcAlpha

		Pass
		{
			CGPROGRAM
			#pragma vertex vert
			#pragma fragment frag
			#pragma target 2.0
			#pragma multi_compile_fog

			#include "UnityCG.cginc"

			// Azure[Sky] Start: Including the file that contains the methods and functions needed to apply the fog.
			#include "Assets/Azure[Sky] Dynamic Skybox/Shaders/Transparent/AzureFogCore.cginc"
			// Azure[Sky] End.

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

			struct v2f
			{
				float4 vertex : SV_POSITION;
				float2 texcoord : TEXCOORD0;
				UNITY_FOG_COORDS(1)

				// Azure[Sky] Start: Adding the extra TEXCOORD to store the vertex world position.
				float3 worldPos : TEXCOORD2;
				// Azure[Sky] End.

				UNITY_VERTEX_OUTPUT_STEREO
			};

			sampler2D _MainTex;
			float4 _MainTex_ST;

			v2f vert (appdata_t v)
			{
				v2f o;
				UNITY_SETUP_INSTANCE_ID(v);
				UNITY_INITIALIZE_VERTEX_OUTPUT_STEREO(o);
				o.vertex = UnityObjectToClipPos(v.vertex);
				o.texcoord = TRANSFORM_TEX(v.texcoord, _MainTex);

				// Azure[Sky] Start: Calculating the vertex world position and storing in the extra TEXCOORD.
				o.worldPos = mul(unity_ObjectToWorld, v.vertex);
				// Azure[Sky] End.

				UNITY_TRANSFER_FOG(o, o.vertex);
				return o;
			}

			fixed4 frag (v2f i) : SV_Target
			{
				fixed4 col = tex2D(_MainTex, i.texcoord);
				UNITY_APPLY_FOG(i.fogCoord, col);

				// Azure[Sky] Start: Applying the fog in the output color of the fragment shader.
				col = ApplyAzureFog(col, i.worldPos);
				// Azure[Sky] End:

				return col;
			}
			ENDCG
		}
	}
}