unitycoder · October 18, 2021 10:42 · Jun 30, 2017
diff --git a/Shader paint b/Shader paint
@@ -0,0 +1,96 @@
+Shader "Region28/MaskedPaint"
+{
+	Properties
+	{
+		_MainTex ("Main Texture", 2D) = "white" {}
+		//_Mask("Mask Texture", 2D) = "white" {}
+		_Brush("Brush Texture", 2D) = "white" {}
+		[HideInInspector]_BrushPos("Mask Position", Vector) = (0.5,0.5,0.0,0.0)
+		_BrushSize("Mask Size", Range(0, 10)) = 1.0
+		_BrushRotation("Rotation", Range(0, 360)) = 0
+		_BrushTint("Mask Tint", Color) = (1,1,1,1)
+	}
+
+	SubShader
+	{
+		Tags { "RenderType"="Opaque" }
+		Cull Off
+		ZWrite Off
+		ZTest Always
+
+		Pass
+		{
+			CGPROGRAM
+			#pragma vertex vert
+			#pragma fragment frag
+
+			#include "UnityCG.cginc"
+
+			struct appdata
+			{
+				float4 vertex : POSITION;
+				float2 uv : TEXCOORD0;
+			};
+
+			struct v2f
+			{
+				float2 uv : TEXCOORD0;
+				float4 vertex : SV_POSITION;
+			};
+
+			sampler2D _MainTex;
+		//	sampler2D _Mask;
+			sampler2D _Brush;
+
+			float4 _BrushPos;
+			float _BrushSize;
+			float _BrushRotation;
+			float4 _BrushTint;
+
+			float4 _Brush_TexelSize;
+			float4 _MainTex_TexelSize;
+			float4 _MainTex_ST;
+
+			v2f vert (appdata v)
+			{
+				v2f o;
+				o.vertex = UnityObjectToClipPos(v.vertex);
+				o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+				return o;
+			}
+
+			fixed2 posWithRotation(fixed2 pos) {
+				fixed rad = radians(_BrushRotation);
+				fixed _s = sin(rad);
+				fixed _c = cos(rad);
+				float2x2 mat = float2x2(_c, _s, -_s, _c);
+				//mat *= 0.5;
+			//	mat += 0.5;
+				//mat = mat * 2 - 1;
+
+				pos -= 0.5;
+				pos = mul(pos, mat);
+				pos += 0.5;
+				return pos;
+			}
+
+			fixed4 frag (v2f i) : SV_Target
+			{
+				fixed4 col = tex2D(_MainTex, i.uv);
+			//	fixed clip = tex2D(_Mask, i.uv).r;
+
+				fixed scale = (_BrushSize * _Brush_TexelSize.z * _MainTex_TexelSize.x);
+				//fixed2 pos = clamp( i.uv - (_MaskPos.xy - 0.5 * scale ) , 0, 1);
+				fixed2 pos = i.uv - (_BrushPos.xy - 0.5 * scale);
+				pos = posWithRotation(pos / scale);
+
+				fixed4 _maskCol = fixed4(1,1,1,0);
+				if(pos.x > 0 && pos.x < 1 && pos.y > 0 && pos.y < 1)
+					_maskCol = tex2D(_Brush, pos) * _BrushTint;
+
+				return lerp(col, float4(_maskCol.rgb,1.0), _maskCol.a);
+			}
+			ENDCG
+		}
+	}
+}
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