Merge pull request #1617 from Unity-Technologies/DisableFogWithDiffsueAndSpecularDebug

Disable fog when Diffuse, Specular and luxmeter debug modes are enabled

com.unity.render-pipelines.high-definition/CHANGELOG.md

 - Fixed issue when using more than one volume mask texture with density volumes.
 - Fixed an error which prevented volumetric lighting from working if no density volumes with 3D textures were present.
 - Fixed issue with color temperature not take correctly into account with static lighting
+- Don't display fog when diffuse lighting, specular lighting, or lux meter debug mode are enabled.
 
 ### Added
 - Add option supportDitheringCrossFade on HDRP Asset to allow to remove shader variant during player build if needed

com.unity.render-pipelines.high-definition/HDRP/Sky/AtmosphericScattering/AtmosphericScattering.hlsl

 
 TEXTURE3D(_VBufferLighting);
 
+#ifdef DEBUG_DISPLAY
+#include "../../Debug/DebugDisplay.hlsl"
+#endif
+
 CBUFFER_START(AtmosphericScattering)
 int     _AtmosphericScatteringType;
 // Common
 {
     float3 fogColor = 0;
     float  fogFactor = 0;
+
+#ifdef DEBUG_DISPLAY
+    // Don't sample atmospheric scattering when lighting debug more are enabled so fog is not visible
+    if (_DebugLightingMode == DEBUGLIGHTINGMODE_DIFFUSE_LIGHTING || _DebugLightingMode == DEBUGLIGHTINGMODE_SPECULAR_LIGHTING || _DebugLightingMode == DEBUGLIGHTINGMODE_LUX_METER)
+        return float4(0, 0, 0, 0);
+#endif
 
     switch (_AtmosphericScatteringType)
     {

com.unity.render-pipelines.high-definition/HDRP/Sky/OpaqueAtmosphericScattering.shader

 
             #pragma vertex Vert
             #pragma fragment Frag
+            
+            #pragma multi_compile _ DEBUG_DISPLAY
 
             // #pragma enable_d3d11_debug_symbols