From 7062992d9b5a6b64277e5bb2366be87b109232af Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Wed, 16 Sep 2020 16:58:21 -0700
Subject: [PATCH] dynamic shadow bias

---
 Effects/FXB/DeferredPBREffect.fxb | Bin 52160 -> 52564 bytes
 Effects/HLSL/DeferredPBREffect.fx |  21 +++++++++++----------
 Renderer.cs                       |  23 ++++++++---------------
 3 files changed, 19 insertions(+), 25 deletions(-)

diff --git a/Effects/FXB/DeferredPBREffect.fxb b/Effects/FXB/DeferredPBREffect.fxb
index a9961cf37ec65f66aecf53a97bebf2335aa4df03..5934933a7e19ec1cde2840c6542e7438fa47a5c7 100644
GIT binary patch
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diff --git a/Effects/HLSL/DeferredPBREffect.fx b/Effects/HLSL/DeferredPBREffect.fx
index 65c1eb9..c64a9f2 100644
--- a/Effects/HLSL/DeferredPBREffect.fx
+++ b/Effects/HLSL/DeferredPBREffect.fx
@@ -73,9 +73,10 @@ float GeometrySmith(float3 N, float3 V, float3 L, float roughness)
     return ggx1 * ggx2;
 }
 
-float ComputeShadow(float4 positionLightSpace)
+float ComputeShadow(float4 positionLightSpace, float3 N, float L)
 {
-    float bias = 0.001; //0.005; 
+    float bias = 0.005 * tan(acos(dot(N, L)));
+    bias = clamp(bias, 0, 0.01);
 
     // maps to [-1, 1]
     float3 projectionCoords = positionLightSpace.xyz / positionLightSpace.w;
@@ -99,7 +100,7 @@ float ComputeShadow(float4 positionLightSpace)
 }
 
 float3 ComputeLight(
-    float3 lightDir,
+    float3 L,
     float3 radiance,
     float3 F0,
     float3 V,
@@ -109,7 +110,6 @@ float3 ComputeLight(
     float roughness,
     float shadow
 ) {
-    float3 L = normalize(lightDir);
     float3 H = normalize(V + L);
 
     float NDF = DistributionGGX(N, H, roughness);
@@ -136,9 +136,6 @@ float4 ComputeColor(
     float metallic,
     float roughness
 ) {
-    float4 positionLightSpace = mul(float4(worldPosition, 1.0), LightSpaceMatrix);
-    float shadow = ComputeShadow(positionLightSpace);
-
     float3 V = normalize(EyePosition - worldPosition);
     float3 N = normalize(worldNormal);
 
@@ -151,18 +148,22 @@ float4 ComputeColor(
     for (int i = 0; i < MAX_POINT_LIGHTS; i++)
     {
         float3 lightDir = PointLightPositions[i] - worldPosition;
+        float3 L = normalize(lightDir);
         float distance = length(lightDir);
         float attenuation = 1.0 / (distance * distance);
         float3 radiance = PointLightColors[i] * attenuation;
 
-        Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness, 1.0);
+        Lo += ComputeLight(L, radiance, F0, V, N, albedo, metallic, roughness, 1.0);
     }
 
     // directional light
-    float3 lightDir = DirectionalLightDirection;
+    float3 L = normalize(DirectionalLightDirection);
     float3 radiance = DirectionalLightColor;
 
-    Lo += ComputeLight(lightDir, radiance, F0, V, N, albedo, metallic, roughness, (1.0 - shadow));
+    float4 positionLightSpace = mul(float4(worldPosition, 1.0), LightSpaceMatrix);
+    float shadow = ComputeShadow(positionLightSpace, N, L);
+
+    Lo += ComputeLight(L, radiance, F0, V, N, albedo, metallic, roughness, (1.0 - shadow));
 
     float3 ambient = float3(0.03, 0.03, 0.03) * albedo; // * AO;
     float3 color = ambient + Lo;
diff --git a/Renderer.cs b/Renderer.cs
index 058a383..d5d136f 100644
--- a/Renderer.cs
+++ b/Renderer.cs
@@ -171,7 +171,6 @@ namespace Kav
             SpriteBatch.End();
         }
 
-        // for shadow mapping
         public void ShadowMapRender(Camera camera, IEnumerable<(Model, Matrix)> modelTransforms, DirectionalLight directionalLight)
         {
             GraphicsDevice.SetRenderTarget(ShadowRenderTarget);
@@ -199,24 +198,18 @@ namespace Kav
             }
 
             BoundingBox lightBox = BoundingBox.CreateFromPoints(frustumCorners);
-            Vector3 boxSize = lightBox.Max - lightBox.Min;
-            Vector3 halfBoxSize = boxSize * 0.5f;
-
             Vector3 lightPosition = frustumCenter + directionalLight.Direction * -lightBox.Min.Z;
-            //lightPosition.Z = lightBox.Min.Z;
-            //lightPosition = Vector3.Transform(lightPosition, Matrix.Invert(lightRotation));
             
             SimpleDepthEffect.View = Matrix.CreateLookAt(lightPosition, frustumCenter, camera.View.Right);
-            SimpleDepthEffect.Projection = Matrix.CreateOrthographicOffCenter(lightBox.Min.X, lightBox.Max.X, lightBox.Min.Y, lightBox.Max.Y, 0, lightBox.Max.Z - lightBox.Min.Z);
-
-            //SimpleDepthEffect.View = directionalLight.View;
-            //SimpleDepthEffect.Projection = directionalLight.Projection;
+            SimpleDepthEffect.Projection = Matrix.CreateOrthographicOffCenter(
+                lightBox.Min.X,
+                lightBox.Max.X,
+                lightBox.Min.Y,
+                lightBox.Max.Y,
+                0,
+                lightBox.Max.Z - lightBox.Min.Z
+            );
             DeferredPBREffect.LightSpaceMatrix = SimpleDepthEffect.View * SimpleDepthEffect.Projection;
-
-            var globalShadowView = Matrix.CreateLookAt(frustumCenter + directionalLight.Direction * -0.5f, frustumCenter, camera.View.Right);
-            var globalShadowProjection = Matrix.CreateOrthographic(1f, 1f, 0f, 1f);
-            //var texScaleBias = Matrix.CreateScale(0.5f, -0.5f, 1f) * Matrix.CreateTranslation(0.5f, 0.5f, 0f);
-            //DeferredPBREffect.LightSpaceMatrix = globalShadowView * globalShadowProjection; // * texScaleBias;
             
             foreach (var (model, transform) in modelTransforms)
             {