Added GT Toon map;

Changed shadow bias from fixed to slope based;

Runtime/UTS Renderer/UTSToonmapping/UTSToonmapping.shader

@@ -44,8 +44,36 @@ Shader "Hidden/Shader/UTSTonemapping"
 
     inline float3 UTSToonmap(float3 x)
     {
-        // See https://www.desmos.com/calculator/j4tpqazyfw
+    #if 1
+        // GT Tonemap, see https://www.desmos.com/calculator/gslcdxvipg
+        float p = 1.0;
+        float a = 1.0;
+        float m = 0.22;
+        float l = 0.4;
+        float c = 1.33;
+        float b = 0.0;
+
+        float l0 = (l * (p - m)) / a;
+        float L0 = m - m / a;
+        float L1 = m + (1 - m) / a;
+        float3 Lx = m + a * (x - m);
+
+        float3 Tx = m * pow(x / m, c) + b;
+
+        float S0 = m + l0;
+        float S1 = m + a * l0;
+        float C2 = (a * p) / (p - S1);
+        float3 Sx = p - (p - S1) * exp(-(C2 * (x - S0)) / p);
+
+        float3 w0 = 1.0 - smoothstep( 0.0, m, x);
+        float3 w2 = smoothstep(m + l0, m + l0, x);
+        float3 w1 = 1.0 - w0 - w2;
+
+        return Tx * w0 + Lx * w1 + Sx * w2;
+    #else
+        // Modified ACES, see https://www.desmos.com/calculator/j4tpqazyfw
         return (x * (2.63 * x + 0.03)) / (x * (2.11 * x + 0.72) + 0.31);
+    #endif
     }
 
     float4 CustomPostProcess(Varyings input) : SV_Target
@@ -55,9 +83,13 @@ Shader "Hidden/Shader/UTSTonemapping"
         // Note that if HDUtils.DrawFullScreen is not used to render the post process, you don't need to call ClampAndScaleUVForBilinearPostProcessTexture.
         float3 sourceColor = SAMPLE_TEXTURE2D_X(_MainTex, s_linear_clamp_sampler, ClampAndScaleUVForBilinearPostProcessTexture(input.texcoord.xy)).rgb;
 
+    #if 1
+        float3 color = UTSToonmap(sourceColor);
+    #else
         float whiteScale = 1.0 / UTSToonmap(5.3);
         float3 color = UTSToonmap(sourceColor * whiteScale);
         color *= whiteScale;
+    #endif
 
         return float4(color, 1);
     }