fix FPS drop on Android

Assets/Resources/Shaders/Shared.cginc

@@ -6,15 +6,8 @@ fixed4 _Color;
 #ifdef VEHICLE
 int _CarColorIndex;
 
-fixed3 _CarColor1;
+fixed3 _CarColor;
-fixed3 _CarColor2;
+fixed _CarEmission;
-fixed3 _CarColor3;
-fixed3 _CarColor4;
-
-fixed3 _HeadLightColor;
-fixed3 _TailLightColor;
-
-fixed4 _Lights;
 
 float _Metallic;
 float _Smoothness;
@@ -45,35 +38,11 @@ void surf(Input IN, inout SurfaceOutputStandard o)
     fixed3 clr = tex2D(_MainTex, IN.uv_MainTex).rgb;
     fixed mask = tex2D(_MaskTex, IN.uv_MainTex).a;
     
-#ifdef VEHICLE
-    fixed3 carColors[9] = {
-        fixed3(1, 1, 1),
-        _CarColor1,
-        _CarColor2,
-        _CarColor3,
-        _CarColor4,
-        _HeadLightColor,
-        _HeadLightColor,
-        _TailLightColor,
-        _TailLightColor
-    };
 
-    fixed carEmission[9] = {
-        0,
-        0,
-        0,
-        0,
-        0,
-        exp(_Lights.x * 2) - 1,
-        exp(_Lights.y * 2) - 1,
-        exp(_Lights.z * 2) - 1,
-        exp(_Lights.w * 2) - 1
-    };
-#endif
 
     o.Albedo = clr
 #ifdef VEHICLE
-        * carColors[_CarColorIndex]
+        * _CarColor
 #endif
         * IN.color.rgb * _Color.rgb;
 
@@ -82,7 +51,7 @@ void surf(Input IN, inout SurfaceOutputStandard o)
 #ifdef VEHICLE
     o.Metallic = _Metallic * o.Alpha;
     o.Smoothness = _Smoothness;
-    o.Emission = carEmission[_CarColorIndex] * o.Albedo;
+    o.Emission = _CarEmission * o.Albedo;
 #else
     o.Metallic = 0;
     o.Smoothness = 0;

Assets/Resources/Shaders/Vehicle.shader

@@ -11,16 +11,9 @@
         _Color ("Color", Color) = (1, 1, 1, 1)
 
         _CarColorIndex ("Car Color Index", Range(0, 8)) = 0
-        
-        _CarColor1 ("Car Color 1", Color) = (1, 1, 1, 1)
-        _CarColor2 ("Car Color 2", Color) = (1, 1, 1, 1)
-        _CarColor3 ("Car Color 3", Color) = (1, 1, 1, 1)
-        _CarColor4 ("Car Color 4", Color) = (1, 1, 1, 1)
 
-        _HeadLightColor ("Head Light Color", Color) = (1, 1, 1, 1)
+        _CarColor ("Car Color", Color) = (1, 1, 1, 1)
-        _TailLightColor ("Tail Light Color", Color) = (1, 1, 1, 1)
+        _CarEmission ("Car Emission", Range(0, 10)) = 0
-
-        _Lights ("Light Brightnesses", Vector) = (1, 1, 1, 1)
 
         _AlphaCutoff ("Alpha Cutoff", Range(0.0, 1.0)) = 0.5
     }

Assets/Resources/Shaders/VehicleTransparent.shader

@@ -11,16 +11,9 @@
         _Color ("Color", Color) = (1, 1, 1, 1)
         
         _CarColorIndex ("Car Color Index", Range(0, 8)) = 0
-        
-        _CarColor1 ("Car Color 1", Color) = (1, 1, 1, 1)
-        _CarColor2 ("Car Color 2", Color) = (1, 1, 1, 1)
-        _CarColor3 ("Car Color 3", Color) = (1, 1, 1, 1)
-        _CarColor4 ("Car Color 4", Color) = (1, 1, 1, 1)
-        
-        _HeadLightColor ("Head Light Color", Color) = (1, 1, 1, 1)
-        _TailLightColor ("Tail Light Color", Color) = (1, 1, 1, 1)
 
-        _Lights ("Light Brightnesses", Vector) = (1, 1, 1, 1)
+        _CarColor ("Car Color", Color) = (1, 1, 1, 1)
+        _CarEmission ("Car Emission", Range(0, 10)) = 0
     }
 
     SubShader

Assets/Scripts/Behaviours/Vehicles/Vehicle.cs

@@ -453,16 +453,55 @@ namespace SanAndreasUnity.Behaviours.Vehicles
             _colorsChanged = false;
 
             var indices = CarColors.FromIndices(_colors);
-            for (var i = 0; i < 4; ++i)
-                _props.SetColor(CarColorIds[i], indices[i]);
 
-            _props.SetVector(LightsId, new Vector4(_lights[0], _lights[1], _lights[2], _lights[3]));
+            Color32 headLightColor = new Color32(255, 255, 255, 255);
+            Color32 tailLightColor = new Color32(255, 255, 255, 255);
+
+            // compute car colors
+            Color32[] carColors = new []
+            {
+                new Color32(255, 255, 255, 255),
+                indices[0],
+                indices[1],
+                indices[2],
+                indices[3],
+                headLightColor,
+                headLightColor,
+                tailLightColor,
+                tailLightColor,
+            };
+
+            // compute car emissions
+            float[] carEmissions = new[]
+            {
+                0f,
+                0f,
+                0f,
+                0f,
+                0f,
+                Mathf.Exp(_lights[0] * 2) - 1,
+                Mathf.Exp(_lights[1] * 2) - 1,
+                Mathf.Exp(_lights[2] * 2) - 1,
+                Mathf.Exp(_lights[3] * 2) - 1,
+            };
 
             foreach (var frame in _frames)
             {
                 var mr = frame.GetComponent<MeshRenderer>();
                 if (mr == null) continue;
-                mr.SetPropertyBlock(_props);
+
+                // get color index from each material, and assign properties accordingly
+
+                var materials = mr.sharedMaterials;
+
+                for (int i = 0; i < materials.Length; i++)
+                {
+                    int carColorIndex = materials[i].GetInt("_CarColorIndex");
+                    _props.SetColor("_CarColor", carColors[carColorIndex]);
+                    _props.SetFloat("_CarEmission", carEmissions[carColorIndex]);
+                    mr.SetPropertyBlock(_props, i);
+                }
+
             }
         }