Init

Assets/Sandbox/Shader/NewUnlitShader.shader

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+Shader "Unlit/NewUnlitShader"
+{
+    Properties
+    {
+        _MainTex ("Texture", 2DArray) = "white" {}
+        _TexNo ("TexNo", 2D) = "white" {}
+        _MaskNo ("MaskNo", 2D) = "black" {}
+        _MaskTex ("Mask", 2DArray) = "black" {}
+        _BorderColor ("BorderColor", Color) = (1,1,1,1)
+        _BorderWidth ("BorderWidth", Range(0,0.1)) = 0.05
+    }
+    SubShader
+    {
+        Tags
+        {
+            "RenderType"="Opaque"
+        }
+        LOD 100
+
+        Pass
+        {
+            CGPROGRAM
+            #pragma vertex vert
+            #pragma fragment frag
+            // make fog work
+            #pragma multi_compile_fog
+
+            #include "UnityCG.cginc"
+
+            struct appdata
+            {
+                float4 vertex : POSITION;
+                float2 uv : TEXCOORD0;
+                float2 uv2: TEXCOORD2;
+            };
+
+            struct v2f
+            {
+                float2 uv : TEXCOORD0;
+                float2 uv2 : TEXCOORD2;
+
+                // UNITY_FOG_COORDS(1)
+                float4 vertex : SV_POSITION;
+            };
+
+            UNITY_DECLARE_TEX2DARRAY(_MainTex);
+            sampler2D _TexNo;
+            sampler2D _MaskNo;
+            UNITY_DECLARE_TEX2DARRAY(_MaskTex);
+
+            float4 _MainTex_ST;
+            float4 _TexNo_TexelSize;
+
+            float4 _BorderColor;
+            float _BorderWidth;
+
+            v2f vert(appdata v)
+            {
+                v2f o;
+                o.vertex = UnityObjectToClipPos(v.vertex);
+                // o.uv = TRANSFORM_TEX(v.uv, _MainTex);
+                // o.uv2 = TRANSFORM_TEX(v.uv2, _MainTex);
+                o.uv = v.uv;
+                o.uv2 = v.uv2;
+                return o;
+            }
+
+            float4 Blend(float4 color, float2 uv, float mask, int layer)
+            {
+                float4 col2 = UNITY_SAMPLE_TEX2DARRAY(_MainTex, float3(uv , layer));
+                int idx = round(mask * 16);
+                float4 maskTexCol = UNITY_SAMPLE_TEX2DARRAY(_MaskTex, float3(uv , idx));
+                return lerp(color, col2, maskTexCol);
+            }
+
+            int GetTexNo(float f)
+            {
+                float idx = (f * 64);
+                return round(idx);
+            }
+
+            fixed4 showGridLine(fixed4 col, float2 uv, float2 uv1)
+            {
+                if (uv.x < _BorderWidth || uv.y < _BorderWidth || uv.x > 1 - _BorderWidth || uv.y > 1 - _BorderWidth)
+                {
+                    col = _BorderColor;
+                }
+
+                return col;
+            }
+
+            fixed4 frag(v2f i) : SV_Target
+            {
+                // 整个大uv往下偏移
+                float2 uv = i.uv + float2(0, _TexNo_TexelSize.y);
+
+                // 贴图编号
+                float4 texNo = tex2D(_TexNo, uv);
+
+                int layer1 = GetTexNo(texNo.r);
+                int layer2 = GetTexNo(texNo.g);
+                int layer3 = GetTexNo(texNo.b);
+                int layer4 = GetTexNo(texNo.a);
+
+                // 取出遮罩值
+                float4 maskNo = tex2D(_MaskNo, uv);
+                float4 col = UNITY_SAMPLE_TEX2DARRAY(_MainTex, float3(i.uv2 , layer1));
+                if (layer2 > 0)
+                {
+                    col = Blend(col, i.uv2, maskNo.g, layer2);
+                }
+
+                if (layer3 > 0)
+                {
+                    col = Blend(col, i.uv2, maskNo.b, layer3);
+                }
+
+                if (layer4 > 0)
+                {
+                    col = Blend(col, i.uv2, maskNo.a, layer4);
+                }
+
+                // col = showGridLine(col, i.uv2, i.uv);
+
+                return col;
+            }
+            ENDCG
+        }
+    }
+}