Added entity lighting support, by forwarding the shade vector and light color from the engine to Unity. The lighting calculations are replicated in the Quake shader.

This is currently per-pixel shading (as opposed to the more authentic gouraud shading) and it's only applied to alias models at the moment. Brush models will have to be figured out properly.

Assets/Scripts/Data/QExtensions.cs

@@ -56,6 +56,11 @@ public static class QExtensions
         return new Vector3(origin.y, origin.z, -origin.x);
     }
     
+    public static Vector3 ToUnityDirection(this QVec3 dir)
+    {
+        return new Vector3(dir.y, dir.z, -dir.x);
+    }
+
     public static Quaternion ToUnityRotation(this QVec3 angles)
     {
         return Quaternion.AngleAxis(-angles.y, Vector3.up)
@@ -71,4 +76,9 @@ public static class QExtensions
             (byte)((color >> 16) & 0xFF),
             (byte)((color >> 24) & 0xFF));
     }
+
+    public static Color ToColor(this QVec3 vec)
+    {
+        return new Color(vec.x, vec.y, vec.z);
+    }
 }

Assets/Scripts/Game/Entity.cs

@@ -159,6 +159,15 @@ public class Entity
         }
     }
 
+    public void SetLighting(Vector3 shadeVector, Color lightColor)
+    {
+        if (material == null)
+            return;
+        
+        material.SetVector("_ShadeVector", shadeVector);
+        material.SetVector("_LightColor", lightColor);
+    }
+
     private void AssignMeshRenderer()
     {
         material = visualStyle.CreateEntityMaterial(true);

Assets/Scripts/Modules/GameModule.Interop.cs

@@ -17,6 +17,7 @@ public partial class GameModule : CallbackHandler<GameModule>
             RemoveEntity = CreateCallback<GameRemoveEntityCallback>(Callback_GameRemoveEntity),
             UpdateEntityAnimation = CreateCallback<GameUpdateEntityAnimationCallback>(Callback_GameUpdateEntityAnimation),
             SetEntitySkin = CreateCallback<GameSetEntitySkinCallback>(Callback_GameSetEntitySkin),
+            SetEntityLighting = CreateCallback<GameSetEntityLightingCallback>(Callback_GameSetEntityLighting),
             
             RunParticleEffect = CreateCallback<RunParticleEffectCallback>(Callback_RunParticleEffect),
             CreateParticleEffect = CreateCallback<CreateParticleEffectCallback>(Callback_CreateParticleEffect),
@@ -37,6 +38,7 @@ public partial class GameModule : CallbackHandler<GameModule>
         public IntPtr RemoveEntity;
         public IntPtr UpdateEntityAnimation;
         public IntPtr SetEntitySkin;
+        public IntPtr SetEntityLighting;
         
         public IntPtr RunParticleEffect;
         public IntPtr CreateParticleEffect;
@@ -98,6 +100,17 @@ public partial class GameModule : CallbackHandler<GameModule>
         Profiler.EndSample();
     }
     
+    [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
+    private delegate void GameSetEntityLightingCallback(IntPtr context, int entityNum, ref QVec3 shadeVector, ref QVec3 lightColor);
+
+    [MonoPInvokeCallback(typeof(GameSetEntityLightingCallback))]
+    private static void Callback_GameSetEntityLighting(IntPtr context, int entityNum, ref QVec3 shadeVector, ref QVec3 lightColor)
+    {
+        Profiler.BeginSample("GameSetEntityLighting");
+        GetSelf(context).SetEntityLighting(entityNum, shadeVector.ToUnityDirection(), lightColor.ToColor());
+        Profiler.EndSample();
+    }
+    
     [UnmanagedFunctionPointer(CallingConvention.Cdecl)]
     private delegate void RunParticleEffectCallback(IntPtr context, ref QVec3 origin, ref QVec3 direction, uint colorMin, uint colorMax, int count);
 
@@ -105,7 +118,7 @@ public partial class GameModule : CallbackHandler<GameModule>
     private static void Callback_RunParticleEffect(IntPtr context, ref QVec3 origin, ref QVec3 direction, uint colorMin, uint colorMax, int count)
     {
         Profiler.BeginSample("RunParticleEffect");
-        GetSelf(context).RunParticleEffect(origin.ToUnityPosition(), direction.ToUnityPosition(), colorMin.ToColor(), colorMax.ToColor(), count);
+        GetSelf(context).RunParticleEffect(origin.ToUnityPosition(), direction.ToUnityDirection(), colorMin.ToColor(), colorMax.ToColor(), count);
         Profiler.EndSample();
     }
 

Assets/Scripts/Modules/GameModule.cs

@@ -68,6 +68,11 @@ public partial class GameModule
         uq.GameState.GetEntity(entityNum).SetSkin(skinNum);
     }
 
+    private void SetEntityLighting(int entityNum, Vector3 shadeVector, Color lightColor)
+    {
+        uq.GameState.GetEntity(entityNum).SetLighting(shadeVector, lightColor);
+    }
+    
     private void RunParticleEffect(Vector3 position, Vector3 direction, Color colorMin, Color colorMax, int count)
     {
         uq.CurrentStyle.Particles.RunParticleEffect(position, direction, colorMin,colorMax, count, uq.GameLayer);

Assets/Shaders/Quake.shader

@@ -13,6 +13,9 @@ Shader "UniQuake/Quake"
         [HDR] _EmissionColor("Emission Color", Color) = (0,0,0)
         [NoScaleOffset]_EmissionMap("Emission Map", 2D) = "white" {}
         
+        [HideInInspector] _ShadeVector("Shade Vector", Vector) = (0, 0, 0)
+        [HideInInspector] _LightColor("Light Color", Color) = (1, 1, 1, 1)
+
         // Blending state
         [HideInInspector] _Surface("__surface", Float) = 0.0
         [HideInInspector] _Blend("__blend", Float) = 0.0

Assets/Shaders/QuakeForwardPass.hlsl

@@ -129,11 +129,14 @@ half4 LitPassFragmentSimple(Varyings input) : SV_Target
     half4 lightmapColor = SAMPLE_TEXTURE2D(_LightMap, sampler_LightMap, input.lightmapUV);
     half3 finalColor = diffuse * lightmapColor.rgb * 2.0f;
 #else
-    // Specular and smoothness are some bogus values just to make models not appear completely black on one side
-    half3 finalColor = UniversalFragmentBlinnPhong(inputData, diffuse, half4(0.2, 0.2, 0.2, 1), 0.5, 0.0, alpha).rgb;
-    // Light light = GetMainLight();
-    // half3 diffuseColor = LightingLambert(light.color, light.direction, inputData.normalWS);
-    // half3 finalColor = diffuse * diffuseColor;
+    // This reproduces anorm_dots within a reasonable degree of tolerance
+    half shade = dot(_ShadeVector.xyz, inputData.normalWS);
+    if (shade < 0.0)
+        shade = 1.0 + shade * (13.0 / 44.0);
+    else
+        shade = 1.0 + shade;
+    
+    half3 finalColor = diffuse * shade * _LightColor.rgb;
 #endif
 
 #ifdef _EMISSION

Assets/Shaders/QuakeInput.hlsl

@@ -11,6 +11,8 @@ CBUFFER_START(UnityPerMaterial)
     half4 _EmissionColor;
     half _Cutoff;
     half _Surface;
+    half4 _ShadeVector;
+    half4 _LightColor;
 CBUFFER_END
 
 #ifdef UNITY_DOTS_INSTANCING_ENABLED
@@ -19,12 +21,16 @@ CBUFFER_END
         UNITY_DOTS_INSTANCED_PROP(float4, _EmissionColor)
         UNITY_DOTS_INSTANCED_PROP(float , _Cutoff)
         UNITY_DOTS_INSTANCED_PROP(float , _Surface)
+        UNITY_DOTS_INSTANCED_PROP(half4, _ShadeVector)
+        UNITY_DOTS_INSTANCED_PROP(half4, _LightColor)
     UNITY_DOTS_INSTANCING_END(MaterialPropertyMetadata)
 
     #define _BaseColor          UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(float4 , Metadata__BaseColor)
     #define _EmissionColor      UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(float4 , Metadata__EmissionColor)
     #define _Cutoff             UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(float  , Metadata__Cutoff)
     #define _Surface            UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(float  , Metadata__Surface)
+    #define _ShadeVector        UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(half4  , Metadata__ShadeVector)
+    #define _LightColor         UNITY_ACCESS_DOTS_INSTANCED_PROP_FROM_MACRO(half4  , Metadata__LightColor)
 #endif
 
                                  SAMPLER(point_repeat_sampler);

engine/Quake/client.h

@@ -377,6 +377,7 @@ void UQ_Game_SetEntityTransform(int entityNum, vec3_t origin, vec3_t angles);
 void UQ_Game_RemoveEntity(int entityNum);
 void UQ_Game_UpdateEntityAnimation(int entityNum, int pose1, int pose2, float blend);
 void UQ_Game_SetEntitySkin(int entityNum, int skinNum);
+void UQ_Game_SetEntityLighting(int entityNum, vec3_t shadeVector, vec3_t lightColor);
 
 #endif	/* _CLIENT_H_ */
 

engine/Quake/r_alias.c

@@ -619,6 +619,8 @@ void R_SetupAliasLighting (entity_t	*e)
 
 	shadedots = r_avertexnormal_dots[quantizedangle];
 	VectorScale (lightcolor, 1.0f / 200.0f, lightcolor);
+
+	UQ_Game_SetEntityLighting(e->num, shadevector, lightcolor);
 }
 
 /*

engine/UniQuake/game_uniquake.c

@@ -9,6 +9,7 @@ typedef struct unity_gamecalls_s
 	void(*RemoveEntity)(void *context, int entityNum);
 	void(*UpdateEntityAnimation)(void *context, int entityNum, int pose1, int pose2, float blend);
 	void(*SetEntitySkin)(void *context, int entityNum, int skinNum);
+	void(*SetEntityLighting)(void *context, int entityNum, vec3_t shadeVector, vec3_t lightColor);
 
 	void(*RunParticleEffect)(void *context, vec3_t origin, vec3_t direction, unsigned int colorMin, unsigned int colorMax, int count);
 	void(*CreateParticleEffect)(void *context, int type, vec3_t origin, unsigned int colorMin, unsigned int colorMax);
@@ -49,6 +50,11 @@ void UQ_Game_SetEntitySkin(int entityNum, int skinNum)
 	unity_gamecalls->SetEntitySkin(unity_context, entityNum, skinNum);
 }
 
+void UQ_Game_SetEntityLighting(int entityNum, vec3_t shadeVector, vec3_t lightColor)
+{
+	unity_gamecalls->SetEntityLighting(unity_context, entityNum, shadeVector, lightColor);
+}
+
 void UQ_Game_RunParticleEffect(vec3_t origin, vec3_t direction, int color, int count)
 {
 	unsigned int colorMin, colorMax;