toon shadows

EffectInterfaces/ShadowCascadeEffect.cs

@@ -0,0 +1,14 @@
+using Microsoft.Xna.Framework;
+
+namespace Kav
+{
+    public interface ShadowCascadeEffect
+    {
+        Matrix LightSpaceMatrixOne { get; set; }
+        Matrix LightSpaceMatrixTwo { get; set; }
+        Matrix LightSpaceMatrixThree { get; set; }
+        Matrix LightSpaceMatrixFour { get; set; }
+
+        float[] CascadeFarPlanes { get; }
+    }
+}

Effects/DeferredPBR_DirectionalLightEffect.cs

@@ -3,7 +3,7 @@ using Microsoft.Xna.Framework.Graphics;
 
 namespace Kav
 {
-    public class DeferredPBR_DirectionalLightEffect : Effect
+    public class DeferredPBR_DirectionalLightEffect : Effect, ShadowCascadeEffect
     {
         EffectParameter gPositionParam;
         EffectParameter gAlbedoParam;
@@ -46,7 +46,7 @@ namespace Kav
         public Vector3 DirectionalLightDirection { get; set; }
         public Vector3 DirectionalLightColor { get; set; }
 
-        public readonly float[] CascadeFarPlanes;
+        public float[] CascadeFarPlanes { get; }
 
         public int ShadowMapSize { get; set; }
 
@@ -147,7 +147,6 @@ namespace Kav
             directionalLightColorParam     = Parameters["DirectionalLightColor"];
 
             cascadeFarPlanesParam          = Parameters["CascadeFarPlanes"];
-
             shadowMapSizeParam             = Parameters["ShadowMapSize"];
 
             lightSpaceMatrixOneParam       = Parameters["LightSpaceMatrixOne"];

Effects/Deferred_ToonEffect.cs

@@ -3,30 +3,61 @@ using Microsoft.Xna.Framework.Graphics;
 
 namespace Kav
 {
-    public class Deferred_ToonEffect : Effect
+    public class Deferred_ToonEffect : Effect, ShadowCascadeEffect
     {
         EffectParameter gPositionParam;
         EffectParameter gAlbedoParam;
         EffectParameter gNormalParam;
 
+        EffectParameter shadowMapOneParam;
+        EffectParameter shadowMapTwoParam;
+        EffectParameter shadowMapThreeParam;
+        EffectParameter shadowMapFourParam;
+
         EffectParameter eyePositionParam;
         EffectParameter directionalLightDirectionParam;
         EffectParameter directionalLightColorParam;
 
         EffectParameter softnessParam;
 
+        EffectParameter cascadeFarPlanesParam;
+        EffectParameter shadowMapSizeParam;
+
+        EffectParameter lightSpaceMatrixOneParam;
+        EffectParameter lightSpaceMatrixTwoParam;
+        EffectParameter lightSpaceMatrixThreeParam;
+        EffectParameter lightSpaceMatrixFourParam;
+
+        EffectParameter viewMatrixParam;
+
         public Texture2D GPosition { get; set; }
         public Texture2D GAlbedo { get; set; }
         public Texture2D GNormal { get; set; }
 
+        public Texture2D ShadowMapOne { get; set; }
+        public Texture2D ShadowMapTwo { get; set; }
+        public Texture2D ShadowMapThree { get; set; }
+        public Texture2D ShadowMapFour { get; set; }
+
         public Vector3 EyePosition { get; set; }
         public Vector3 DirectionalLightDirection { get; set; }
         public Vector3 DirectionalLightColor { get; set; }
 
         public float Softness { get; set; }
 
+        public float[] CascadeFarPlanes { get; }
+        public float ShadowMapSize { get; set; }
+
+        public Matrix LightSpaceMatrixOne { get; set; }
+        public Matrix LightSpaceMatrixTwo { get; set; }
+        public Matrix LightSpaceMatrixThree { get; set; }
+        public Matrix LightSpaceMatrixFour { get; set; }
+
+        public Matrix ViewMatrix { get; set; }
+
         public Deferred_ToonEffect(GraphicsDevice graphicsDevice) : base(graphicsDevice, Resources.Deferred_ToonEffect)
         {
+            CascadeFarPlanes = new float[4];
             CacheEffectParameters();   
         }
 
@@ -36,11 +67,26 @@ namespace Kav
             gAlbedoParam.SetValue(GAlbedo);
             gNormalParam.SetValue(GNormal);
 
+            shadowMapOneParam.SetValue(ShadowMapOne);
+            shadowMapTwoParam.SetValue(ShadowMapTwo);
+            shadowMapThreeParam.SetValue(ShadowMapThree);
+            shadowMapFourParam.SetValue(ShadowMapFour);
+
             eyePositionParam.SetValue(EyePosition);
             directionalLightDirectionParam.SetValue(DirectionalLightDirection);
             directionalLightColorParam.SetValue(DirectionalLightColor);
 
             softnessParam.SetValue(Softness);
+
+            cascadeFarPlanesParam.SetValue(CascadeFarPlanes);
+            shadowMapSizeParam.SetValue(ShadowMapSize);
+
+            lightSpaceMatrixOneParam.SetValue(LightSpaceMatrixOne);
+            lightSpaceMatrixTwoParam.SetValue(LightSpaceMatrixTwo);
+            lightSpaceMatrixThreeParam.SetValue(LightSpaceMatrixThree);
+            lightSpaceMatrixFourParam.SetValue(LightSpaceMatrixFour);
+
+            viewMatrixParam.SetValue(ViewMatrix);
         }
 
         void CacheEffectParameters()
@@ -49,11 +95,26 @@ namespace Kav
             gAlbedoParam                   = Parameters["gAlbedo"];
             gNormalParam                   = Parameters["gNormal"];
 
+            shadowMapOneParam              = Parameters["shadowMapOne"];
+            shadowMapTwoParam              = Parameters["shadowMapTwo"];
+            shadowMapThreeParam            = Parameters["shadowMapThree"];
+            shadowMapFourParam             = Parameters["shadowMapFour"];
+
             eyePositionParam               = Parameters["EyePosition"];
             directionalLightDirectionParam = Parameters["DirectionalLightDirection"];
             directionalLightColorParam     = Parameters["DirectionalLightColor"];
 
             softnessParam                  = Parameters["Softness"];
+
+            cascadeFarPlanesParam          = Parameters["CascadeFarPlanes"];
+            shadowMapSizeParam             = Parameters["ShadowMapSize"];
+
+            lightSpaceMatrixOneParam       = Parameters["LightSpaceMatrixOne"];
+            lightSpaceMatrixTwoParam       = Parameters["LightSpaceMatrixTwo"];
+            lightSpaceMatrixThreeParam     = Parameters["LightSpaceMatrixThree"];
+            lightSpaceMatrixFourParam      = Parameters["LightSpaceMatrixFour"];
+
+            viewMatrixParam                = Parameters["ViewMatrix"];
         }
     }
 }

Effects/HLSL/Deferred_ToonEffect.fx

@@ -1,17 +1,37 @@
 #include "Macros.fxh"
+#include "Shadow.fxh"
+
+static const int NUM_SHADOW_CASCADES = 4;
 
 DECLARE_TEXTURE(gPosition, 0);
 DECLARE_TEXTURE(gAlbedo, 1);
 DECLARE_TEXTURE(gNormal, 2);
+DECLARE_TEXTURE(shadowMapOne, 4);
+DECLARE_TEXTURE(shadowMapTwo, 5);
+DECLARE_TEXTURE(shadowMapThree, 6);
+DECLARE_TEXTURE(shadowMapFour, 7);
 
 BEGIN_CONSTANTS
 
-float3 EyePosition                  _ps(c0)     _cb(c0);
+float3 EyePosition                           _ps(c0)     _cb(c0);
 
-float3 DirectionalLightDirection    _ps(c1)     _cb(c1);
+float3 DirectionalLightDirection             _ps(c1)     _cb(c1);
-float3 DirectionalLightColor        _ps(c2)     _cb(c2);
+float3 DirectionalLightColor                 _ps(c2)     _cb(c2);
 
-float Softness                      _ps(c3)     _cb(c3);
+float Softness                               _ps(c3)     _cb(c3);
+
+float CascadeFarPlanes[NUM_SHADOW_CASCADES]  _ps(c4)     _cb(c4);
+
+float ShadowMapSize                          _ps(c8)     _cb(c8);
+
+MATRIX_CONSTANTS
+
+float4x4 LightSpaceMatrixOne                 _ps(c9)     _cb(c9);
+float4x4 LightSpaceMatrixTwo                 _ps(c13)    _cb(c13);
+float4x4 LightSpaceMatrixThree               _ps(c17)    _cb(c17);
+float4x4 LightSpaceMatrixFour                _ps(c21)    _cb(c21);
+
+float4x4 ViewMatrix                          _ps(c25)    _cb(c25);
 
 END_CONSTANTS
 
@@ -37,6 +57,88 @@ PixelInput main_vs(VertexInput input)
     return output;
 }
 
+float ComputeShadow(float3 positionWorldSpace, float3 N, float3 L)
+{
+    float4 positionCameraSpace = mul(float4(positionWorldSpace, 1.0), ViewMatrix);
+
+    int shadowCascadeIndex = 0; // 0 is closest
+    for (int i = 0; i < NUM_SHADOW_CASCADES; i++)
+    {
+        if (abs(positionCameraSpace.z) < CascadeFarPlanes[i])
+        {
+            shadowCascadeIndex = i;
+            break;
+        }
+    }
+
+    float4x4 lightSpaceMatrix;
+
+    if (shadowCascadeIndex == 0)
+    {
+        lightSpaceMatrix = LightSpaceMatrixOne;
+    }
+    else if (shadowCascadeIndex == 1)
+    {
+        lightSpaceMatrix = LightSpaceMatrixTwo;
+    }
+    else if (shadowCascadeIndex == 2)
+    {
+        lightSpaceMatrix = LightSpaceMatrixThree;
+    }
+    else
+    {
+        lightSpaceMatrix = LightSpaceMatrixFour;
+    }
+
+    // PCF + Poisson soft shadows
+
+    if (shadowCascadeIndex == 0)
+    {
+        return PoissonShadow(
+            positionWorldSpace,
+            N,
+            L,
+            lightSpaceMatrix,
+            SAMPLER(shadowMapOne),
+            ShadowMapSize
+        );
+    }
+    else if (shadowCascadeIndex == 1)
+    {
+        return PoissonShadow(
+            positionWorldSpace,
+            N,
+            L,
+            lightSpaceMatrix,
+            SAMPLER(shadowMapTwo),
+            ShadowMapSize
+        );
+    }
+    else if (shadowCascadeIndex == 2)
+    {
+        return PoissonShadow(
+            positionWorldSpace,
+            N,
+            L,
+            lightSpaceMatrix,
+            SAMPLER(shadowMapThree),
+            ShadowMapSize
+        );
+    }
+    else
+    {
+        return PoissonShadow(
+            positionWorldSpace,
+            N,
+            L,
+            lightSpaceMatrix,
+            SAMPLER(shadowMapFour),
+            ShadowMapSize
+        );
+    }
+}
+
+// FIXME: organize this
 float4 main_ps(PixelInput input) : SV_TARGET0
 {
     float3 worldPosition = SAMPLE_TEXTURE(gPosition, input.TexCoord).rgb;
@@ -76,7 +178,8 @@ float4 main_ps(PixelInput input) : SV_TARGET0
     rimIntensity = smoothstep(rimAmount - 0.01, rimAmount + 0.01, rimIntensity);
     float3 rim = rimIntensity * rimColor;
 
-    float3 color = albedo * (light + specular + rim);
+    float shadow = ComputeShadow(worldPosition, N, L);
+    float3 color = albedo * (light + specular + rim) * shadow;
 
     return float4(color, 1.0);
 }

Renderer.cs

@@ -195,11 +195,7 @@ namespace Kav
             GraphicsDevice.Clear(Color.Black);
 
             AmbientLightRender(ambientLight);
-
+            DirectionalLightToonRender(camera, modelTransforms, directionalLight);
-            Deferred_ToonEffect.GPosition = gPosition;
-            Deferred_ToonEffect.GAlbedo = gAlbedo;
-            Deferred_ToonEffect.GNormal = gNormal;
-            DirectionalLightToonRender(camera, directionalLight);
 
             GraphicsDevice.SetRenderTarget(null);
             GraphicsDevice.Clear(Color.Black);
@@ -298,28 +294,7 @@ namespace Kav
             IEnumerable<(Model, Matrix)> modelTransforms,
             DirectionalLight directionalLight
         ) {
-            // render the individual shadow cascades
+            RenderShadows(camera, modelTransforms, directionalLight, DeferredDirectionalLightEffect);
-            var previousFarPlane = camera.NearPlane;
-            for (var i = 0; i < NumShadowCascades; i++)
-            {
-                var farPlane = camera.FarPlane / (MathHelper.Max((NumShadowCascades - i - 1) * 2f, 1f));
-
-                // divide the view frustum 
-                var shadowCamera = new PerspectiveCamera(
-                    camera.Position,
-                    camera.Forward,
-                    camera.Up,
-                    camera.FieldOfView,
-                    camera.AspectRatio,
-                    previousFarPlane,
-                    farPlane
-                );
-                
-                // TODO: This is tightly coupled to the effect and it sucks
-                RenderShadowMap(shadowCamera, modelTransforms, directionalLight, i);
-
-                previousFarPlane = farPlane;
-            }
 
             DeferredDirectionalLightEffect.GPosition = gPosition;
             DeferredDirectionalLightEffect.GAlbedo = gAlbedo;
@@ -345,7 +320,7 @@ namespace Kav
                 directionalLight.Color.ToVector3() * directionalLight.Intensity;
             
             DeferredDirectionalLightEffect.ViewMatrix = camera.View;
-            DeferredDirectionalLightEffect.EyePosition = Matrix.Invert(camera.View).Translation;
+            DeferredDirectionalLightEffect.EyePosition = camera.Position;
 
             GraphicsDevice.SetRenderTarget(ColorRenderTarget);
             GraphicsDevice.BlendState = BlendState.Additive;
@@ -360,11 +335,18 @@ namespace Kav
 
         private void DirectionalLightToonRender(
             PerspectiveCamera camera,
+            IEnumerable<(Model, Matrix)> modelTransforms,
             DirectionalLight directionalLight
         ) {
+            RenderShadows(camera, modelTransforms, directionalLight, Deferred_ToonEffect);
+
             GraphicsDevice.SetRenderTarget(ColorRenderTarget);
             GraphicsDevice.BlendState = BlendState.Additive;
 
+            Deferred_ToonEffect.GPosition = gPosition;
+            Deferred_ToonEffect.GAlbedo = gAlbedo;
+            Deferred_ToonEffect.GNormal = gNormal;
+
             Deferred_ToonEffect.EyePosition = camera.Position;
             Deferred_ToonEffect.DirectionalLightDirection = directionalLight.Direction;
             Deferred_ToonEffect.DirectionalLightColor = 
@@ -372,6 +354,22 @@ namespace Kav
 
             Deferred_ToonEffect.Softness = 0.01f;
 
+            Deferred_ToonEffect.ShadowMapOne = ShadowRenderTargets[0];
+            if (NumShadowCascades > 1)
+            {
+                Deferred_ToonEffect.ShadowMapTwo = ShadowRenderTargets[1];
+            }
+            if (NumShadowCascades > 2)
+            {
+                Deferred_ToonEffect.ShadowMapThree = ShadowRenderTargets[2];
+            }
+            if (NumShadowCascades > 3)
+            {
+                Deferred_ToonEffect.ShadowMapFour = ShadowRenderTargets[3];
+            }
+            
+            Deferred_ToonEffect.ViewMatrix = camera.View;
+
             foreach (EffectPass pass in Deferred_ToonEffect.CurrentTechnique.Passes)
             {
                 pass.Apply();
@@ -380,10 +378,42 @@ namespace Kav
             }
         }
 
+        private void RenderShadows(
+            PerspectiveCamera camera,
+            IEnumerable<(Model, Matrix)> modelTransforms,
+            DirectionalLight directionalLight,
+            ShadowCascadeEffect effect
+        ) {
+            // render the individual shadow cascades
+            var previousFarPlane = camera.NearPlane;
+            for (var i = 0; i < NumShadowCascades; i++)
+            {
+                var farPlane = camera.FarPlane / (MathHelper.Max((NumShadowCascades - i - 1) * 2f, 1f));
+
+                // divide the view frustum 
+                var shadowCamera = new PerspectiveCamera(
+                    camera.Position,
+                    camera.Forward,
+                    camera.Up,
+                    camera.FieldOfView,
+                    camera.AspectRatio,
+                    previousFarPlane,
+                    farPlane
+                );
+                
+                // TODO: This is tightly coupled to the effect and it sucks
+                RenderShadowMap(shadowCamera, modelTransforms, directionalLight, effect, i);
+
+                effect.CascadeFarPlanes[i] = farPlane;
+                previousFarPlane = farPlane;
+            }
+        }
+
         private void RenderShadowMap(
             PerspectiveCamera camera, 
             IEnumerable<(Model, Matrix)> modelTransforms, 
             DirectionalLight directionalLight,
+            ShadowCascadeEffect effect,
             int shadowCascadeIndex
         ) {
             GraphicsDevice.SetRenderTarget(ShadowRenderTargets[shadowCascadeIndex]);
@@ -424,23 +454,21 @@ namespace Kav
 
             if (shadowCascadeIndex == 0)
             {
-                DeferredDirectionalLightEffect.LightSpaceMatrixOne = lightSpaceMatrix;
+                effect.LightSpaceMatrixOne = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 1)
             {
-                DeferredDirectionalLightEffect.LightSpaceMatrixTwo = lightSpaceMatrix;
+                effect.LightSpaceMatrixTwo = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 2)
             {
-                DeferredDirectionalLightEffect.LightSpaceMatrixThree = lightSpaceMatrix;
+                effect.LightSpaceMatrixThree = lightSpaceMatrix;
             }
             else if (shadowCascadeIndex == 3)
             {
-                DeferredDirectionalLightEffect.LightSpaceMatrixFour = lightSpaceMatrix;
+                effect.LightSpaceMatrixFour = lightSpaceMatrix;
             }
 
-            DeferredDirectionalLightEffect.CascadeFarPlanes[shadowCascadeIndex] = camera.FarPlane;
-
             foreach (var (model, transform) in modelTransforms)
             {
                 foreach (var modelMesh in model.Meshes)