Shader "Unlit/SimpleLava"
{
	Properties
	{
		_Color("Tint", Color) = (1, 1, 1, .5)
		_Color2("Tint2", Color) = (1, 1, 1, .5)
		_Color3("TopTint", Color) = (1, 1, 1, .5)

		_FoamC("Foam", Color) = (1, 1, 1, .5)
		_MainTex("Main Texture", 2D) = "white" {}
	_DistortTex("Dist Texture", 2D) = "white" {}

	_Speed("Wave Speed", Range(0,1)) = 0.5
		_Amount("Wave Amount", Range(0,1)) = 0.6
		_Scale("Scale", Range(0,1)) = 0.5
		_Scale2("Scale2", Range(0,1)) = 0.5
		_Height("Wave Height", Range(0,1)) = 0.1
		_Foam("Foamline Thickness", Range(0,10)) = 8
		_Speed2("speed", Range(0,10)) = 8
		_SpeedMain("speed main", Range(0,10)) = 8
		_Offset("Offset", Range(0,10)) = 0.0
		_Strength("Strength Under Lava", Range(0,10)) = 0.0
		_StrengthTop("Strength Top Lava", Range(0,10)) = 0.0
		_Distortion("Distort", Range(0,1)) = 0.0
		_Cutoff("Cutoff top", Range(0,1)) = 0.9

	}
		SubShader
	{
		Tags{ "RenderType" = "Opaque"  "Queue" = "Transparent" }
		LOD 100
		//Blend OneMinusDstColor One
		Cull Off

		GrabPass{
		Name "BASE"
		Tags{ "LightMode" = "Always" }
	}
		Pass
	{
		CGPROGRAM
#pragma vertex vert
#pragma fragment frag
		// make fog work
#pragma multi_compile_fog

			#pragma shader_feature DISTORT

			#pragma shader_feature DARK
#include "UnityCG.cginc"

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

	struct v2f
	{
		float2 uv : TEXCOORD3;
		UNITY_FOG_COORDS(1)
			float4 vertex : SV_POSITION;
		float4 scrPos : TEXCOORD2;//
		float4 worldPos : TEXCOORD4;//
		float4 color :COLOR;
	};
	float4 _Color, _Color2, _Color3, _DarkCol;
	sampler2D _CameraDepthTexture; //Depth Texture
	sampler2D _MainTex, _DarkTex, _DistortTex;//
	float4 _MainTex_ST;
	float _Speed, _Amount, _Height, _Foam, _Scale, _Scale2;//
	float4 _FoamC;
	float _Speed2, _Offset, _Strength, _Distortion, _SpeedMain, _Cutoff, _StrengthTop;
	float _CutoffDark;

	v2f vert(appdata v)
	{
		v2f o;
		UNITY_INITIALIZE_OUTPUT(v2f, o);

		v.vertex.y += sin(_Time.z * _Speed + (v.vertex.x * v.vertex.z * _Amount)) * _Height * v.color.r;//movement
		o.vertex = UnityObjectToClipPos(v.vertex);
		o.worldPos = mul(unity_ObjectToWorld, v.vertex);

		// vertex colors
		o.color = v.color;

		o.scrPos = ComputeScreenPos(o.vertex);
		UNITY_TRANSFER_FOG(o,o.vertex);
		return o;
	}

	fixed4 frag(v2f i) : SV_Target
	{
		// sample the texture
		// uv distortion scale
		float2 uvDistort = (i.worldPos.xz * _Scale2);
		// moving over time
		uvDistort += (_Time.x * _Speed2) + (i.color.r * 0.5);
		// distortion texture
		fixed4 d = tex2D(_DistortTex, uvDistort) * i.color.r;

		// main distorted uv
		float2 uvMain = (i.worldPos.xz * _Scale );
		// plus distortion
		uvMain += (d * i.color.r * _Distortion);
		// plus moving

		uvMain += (_Time.x * _SpeedMain + ((i.color.r * 0.4)));

	half4 col = tex2D(_MainTex, uvMain);// *i.color.r;// texture times tint;

	col += d;
	col *= (i.color.r + 0.2);
	float cola = smoothstep(_Cutoff, _Cutoff + 0.1, col);

	// foamline
	half depth = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE_PROJ(_CameraDepthTexture, UNITY_PROJ_COORD(i.scrPos))); // depth
	half4 foamLine = 1 - saturate(_Foam* (depth - i.scrPos.w));

	// cutoff foamline with distortion texture
	float f = smoothstep(3 * d, (3 * d) + 0.1 , foamLine);

	float4 color = (lerp(_Color, _Color2, saturate((col * _Offset)))) * _Strength;
	// multply with no  - Foam


	color *= (1 - cola);
	color *= (1 - f);
	// foam tinted
	color += (f *_FoamC);

	// toptint
	color += cola * _Color3 *_StrengthTop;


	return   color;
	}
		ENDCG
	}
	}
}