Fixed potential fp16 overflow in DOF

Author: Chman

CHANGELOG.md

@@ -6,6 +6,9 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 
 ## [2.1.8] - 2019-xx-xx
 
+### Fixed
+- Potential fp16 overflow in Depth of Field that could cause NaN on some platforms.
+
 ## [2.1.7] - 2019-06-12
 
 ### Added

PostProcessing/Shaders/Builtins/DepthOfField.hlsl

@@ -28,7 +28,7 @@ half3 _TaaParams; // Jitter.x, Jitter.y, Blending
 half4 FragCoC(VaryingsDefault i) : SV_Target
 {
     float depth = LinearEyeDepth(SAMPLE_DEPTH_TEXTURE(_CameraDepthTexture, sampler_CameraDepthTexture, i.texcoordStereo));
-    half coc = (depth - _Distance) * _LensCoeff / max(depth, 1e-5);
+    half coc = (depth - _Distance) * _LensCoeff / max(depth, 1e-4);
     return saturate(coc * 0.5 * _RcpMaxCoC + 0.5);
 }
 
@@ -130,7 +130,7 @@ half4 FragPrefilter(VaryingsDefault i) : SV_Target
 
     // Weighted average of the color samples
     half3 avg = c0 * w0 + c1 * w1 + c2 * w2 + c3 * w3;
-    avg /= max(w0 + w1 + w2 + w3, 1e-5);
+    avg /= max(w0 + w1 + w2 + w3, 1e-4);
 
     // Select the largest CoC value
     half coc_min = min(coc0, Min3(coc1, coc2, coc3));