GridShader.shader

// Upgrade NOTE: upgraded instancing buffer 'Props' to new syntax.

Shader "PDT Shaders/TestGrid" {
	Properties {
		_LineColor ("Line Color", Color) = (1,1,1,1)
		_InactiveColor ("Cell Color", Color) = (0,1,0,1)
		_ActiveColor ("Selected Color", Color) = (1,0,0,1)
		[PerRendererData] _MainTex ("Albedo (RGB)", 2D) = "white" {}
		[IntRange] _GridSize("Grid Size", Range(1,100)) = 10
		_LineSize("Line Size", Range(0,1)) = 0.15
		[IntRange] _SelectCell("Select Cell Toggle ( 0 = False , 1 = True )", Range(0,1)) = 0.0
		[IntRange] _SelectedCellX("Selected Cell X", Range(0,100)) = 0.0
		[IntRange] _SelectedCellY("Selected Cell Y", Range(0,100)) = 0.0
	}
	SubShader {
		Tags { "Queue"="AlphaTest" "RenderType"="TransparentCutout" }
		LOD 200
	

		CGPROGRAM
		// Physically based Standard lighting model, and enable shadows on all light types
		#pragma surface surf Standard fullforwardshadows

		// Use shader model 3.0 target, to get nicer looking lighting
		#pragma target 3.0

		sampler2D _MainTex;

		struct Input {
			float2 uv_MainTex;
		};

		half _Glossiness = 0.0;
		half _Metallic = 0.0;
		float4 _LineColor;
		float4 _InactiveColor;
		float4 _ActiveColor;

		float _GridSize;
		float _LineSize;

		float _SelectCell;
		float _SelectedCellX;
		float _SelectedCellY;

		// Add instancing support for this shader. You need to check 'Enable Instancing' on materials that use the shader.
		// See https://docs.unity3d.com/Manual/GPUInstancing.html for more information about instancing.
		// #pragma instancing_options assumeuniformscaling
		UNITY_INSTANCING_BUFFER_START(Props)
			// put more per-instance properties here
		UNITY_INSTANCING_BUFFER_END(Props)

		void surf (Input IN, inout SurfaceOutputStandard o) {
			// Albedo comes from a texture tinted by color

			float2 uv = IN.uv_MainTex;
			_SelectedCellX = floor(_SelectedCellX);
			_SelectedCellY = floor(_SelectedCellY);

			fixed4 c = float4(0.0,0.0,0.0,0.0);
			float gsize = floor(_GridSize) + _LineSize;

			float2 id = float2(floor(uv.x/(1.0/gsize)), floor(uv.y/(1.0/gsize)));
			float4 color = _InactiveColor;
			float brightness = _InactiveColor.w;

			if (frac(uv.x*gsize) <= _LineSize || frac(uv.y*gsize) <= _LineSize)
			{
				brightness = _LineColor.w;
				color = _LineColor;
			} //This checks that the cell is currently selected if the Select Cell slider is set to 1 ( True )
			else if (id.x == _SelectedCellX && id.y == _SelectedCellY)
			{
				brightness = _ActiveColor.w;
				color = _ActiveColor;
			}

			//Clip transparent spots using alpha cutout
			if (brightness == 0.0)
				clip(c.a - 1.0);
			

			o.Albedo = float4( color.x*brightness,color.y*brightness,color.z*brightness,brightness);
			// Metallic and smoothness come from slider variables
			o.Metallic = 0.0;
			o.Smoothness = 0.0;
			o.Alpha = 0.0;
		}
		ENDCG
	}
	FallBack "Diffuse"
}