New clouds shader

Assets/dbl-world/shaders.meta

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Assets/dbl-world/shaders/minecraft.meta

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Assets/dbl-world/shaders/minecraft/clouds.shader

@@ -1,4 +1,9 @@
-Shader "Custom/CloudsShader"
+/*
+ * Custom shader for Minecraft clouds
+ * Acts like "UnlitTwoTexture" from Source
+ * Fades with fog
+ */
+Shader "Custom/Minecraft/Clouds"
 {
     Properties
     {
@@ -15,7 +20,7 @@ Shader "Custom/CloudsShader"
 
     SubShader
     {
-        Tags { "Queue"="Transparent" "RenderType"="Transparent" }
+        Tags { "RenderType"="Opaque" }
         Blend One One  // Additive blending
         ZWrite Off
         Cull Off
@@ -25,11 +30,24 @@ Shader "Custom/CloudsShader"
             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;
+            };
+
+            struct v2f
+            {
+                float2 uv1 : TEXCOORD0;
+                float2 uv2 : TEXCOORD1;
+                float4 vertex : SV_POSITION;
+                float3 viewPos : TEXCOORD2;
+            };
+
             sampler2D _MainTex;
             float4 _MainTex_ST;
             half _MainTexScrollX;
@@ -42,58 +60,53 @@ Shader "Custom/CloudsShader"
 
             float4 _Color;
 
-            struct appdata
-            {
-                float4 vertex : POSITION;
-                float2 uv : TEXCOORD0;
-            };
+            // Fog globals
+            uniform float unity_FogStart;
+            uniform float unity_FogEnd;
+            uniform float unity_FogDensity;
 
-            struct v2f
-            {
-                float2 uv1 : TEXCOORD0;
-                float2 uv2 : TEXCOORD1;
-                float4 vertex : SV_POSITION;
-                UNITY_FOG_COORDS(2)
-            };
-
-            v2f vert(appdata v)
+            v2f vert (appdata v)
             {
                 v2f o;
+                float4 worldPos = mul(unity_ObjectToWorld, v.vertex);
+                float4 viewPos = mul(UNITY_MATRIX_V, worldPos);
+                o.viewPos = viewPos.xyz;
                 o.vertex = UnityObjectToClipPos(v.vertex);
                 
                 // Textures scrolling
                 o.uv1 = TRANSFORM_TEX(v.uv, _MainTex) + float2(_MainTexScrollX, _MainTexScrollY) * _Time.y;
                 o.uv2 = TRANSFORM_TEX(v.uv, _NoiseTex) + float2(_NoiseTexScrollX, _NoiseTexScrollY) * _Time.y;
 
-                UNITY_TRANSFER_FOG(o, o.vertex);
-
                 return o;
             }
 
-            fixed4 frag(v2f i) : SV_Target
+            fixed4 frag (v2f i) : SV_Target
             {
                 fixed4 tex1 = tex2D(_MainTex, i.uv1);
                 fixed4 tex2 = tex2D(_NoiseTex, i.uv2);
                 fixed4 col = tex1 * tex2 * _Color;
-                // fixed4 col = _Color;
-                fixed4 fog = fixed4(0, 0, 0, 1);
-/*
-                // Subtractive fog effect — fade to black
-                float dist = distance(_WorldSpaceCameraPos, i.worldPos);
-                float fogFactor = 1.0 - exp(-_FogDensity * dist);
-                fogFactor = saturate(fogFactor);
 
-                col.rgb *= (1.0 - fogFactor); // Fade to black
-*/
-                // Apply the fog
-                // UNITY_APPLY_FOG(i.fogCoord, fog);
-                //col.rgb -= ; // Fade to black
+                // Calculate fog factor
+                float depth = abs(i.viewPos.z);
+                float fogFactor = 1.0;
+                #if defined(FOG_LINEAR)
+                    fogFactor = saturate((unity_FogEnd - depth) / (unity_FogEnd - unity_FogStart));
+                #elif defined(FOG_EXP)
+                    fogFactor = exp2(-unity_FogDensity * depth);
+                #elif defined(FOG_EXP2)
+                    fogFactor = exp2(-unity_FogDensity * unity_FogDensity * depth * depth);
+                #endif
+
+                // col.rgb = lerp(fixed4(0,0,0,0).rgb, col.rgb, fogFactor);
+                
+                col.rgb *= fogFactor; // Fade to black
 
                 return col;
             }
+
             ENDCG
         }
     }
 
-    FallBack "Unlit/Transparent"
+    FallBack "Particles/Standard Unlit"
 }

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