Added macro to control usage of clip space depth biasing.

Disabled clip space depth biasing for HDRP.

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Shadow/Shadow.hlsl

 #define SHADOW_USE_VIEW_BIAS_SCALING            0   // Enable view bias scaling to mitigate light leaking across edges. Uses the light vector if SHADOW_USE_ONLY_VIEW_BASED_BIASING is defined, otherwise uses the normal.
 #define SHADOW_USE_ONLY_VIEW_BASED_BIASING      0   // Enable only light view vector based biasing. If undefined, biasing will be based on the normal and calling code must provide a valid normal.
 #define SHADOW_USE_SAMPLE_BIASING               0   // Enable per sample biasing for wide multi-tap PCF filters. Incompatible with SHADOW_USE_ONLY_VIEW_BASED_BIASING.
+#define SHADOW_USE_DEPTH_BIAS                   0   // Enable clip space z biasing
 // #define SHADOW_DISPATCH_USE_CUSTOM_PUNCTUAL      // Enable custom implementations of GetPunctualShadowAttenuation. If not defined, a default implementation will be used.
 // #define SHADOW_DISPATCH_USE_CUSTOM_DIRECTIONAL   // Enable custom implementations of GetDirectionalShadowAttenuation. If not defined, a default implementation will be used.
 */
 #endif
 #ifndef SHADOW_USE_SAMPLE_BIAS
 #   define SHADOW_USE_SAMPLE_BIAS           0
+#endif
+#ifndef SHADOW_USE_DEPTH_BIAS
+#   define SHADOW_USE_DEPTH_BIAS            0
 #endif
 
 #if SHADOW_USE_ONLY_VIEW_BASED_BIASING != 0

ScriptableRenderPipeline/Core/CoreRP/ShaderLibrary/Shadow/ShadowSampling.hlsl

 //
 //					1 tap PCF sampling
 //
-real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, float slice, uint texIdx, uint sampIdx )
+real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 coord, float slice, uint texIdx, uint sampIdx )
+#if SHADOW_USE_DEPTH_BIAS == 1
-	tcs.z += depthBias;
+	coord.z += depthBias;
+#endif
-	return SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, tcs, slice ).x;
+	return SampleCompShadow_T2DA( shadowContext, texIdx, sampIdx, coord, slice ).x;
-real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 tcs, float slice, Texture2DArray tex, SamplerComparisonState compSamp )
+real SampleShadow_PCF_1tap( ShadowContext shadowContext, inout uint payloadOffset, real3 coord, float slice, Texture2DArray tex, SamplerComparisonState compSamp )
+#if SHADOW_USE_DEPTH_BIAS == 1
-	tcs.z += depthBias;
+	coord.z += depthBias;
+#endif
-	return SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, tcs, slice );
+	return SAMPLE_TEXTURE2D_ARRAY_SHADOW( tex, compSamp, coord, slice );
 }
 
 //
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[4];
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[4];
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[9];
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[9];
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[16];
 
 	real4 shadowMapTexture_TexelSize = real4( texelSizeRcp.xy, textureSize.xy );
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	real shadow = 0.0;
 	real fetchesWeights[16];
 
 	texelSizeRcp *= filterSize;
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	// Terms0 are weights for the individual samples, the other terms are offsets in texel space
 	real4 vShadow3x3PCFTerms0 = real4( 20.0 / 267.0, 33.0 / 267.0, 55.0 / 267.0, 0.0 );
 
 	texelSizeRcp *= filterSize;
 
+#if SHADOW_USE_DEPTH_BIAS == 1
+#endif
 
 	// Terms0 are weights for the individual samples, the other terms are offsets in texel space
 	real4 vShadow3x3PCFTerms0 = real4(20.0 / 267.0, 33.0 / 267.0, 55.0 / 267.0, 0.0);

ScriptableRenderPipeline/HDRenderPipeline/HDRP/Lighting/LightLoop/Shadow.hlsl

 
 #define SHADOW_USE_VIEW_BIAS_SCALING            1   // Enable view bias scaling to mitigate light leaking across edges. Uses the light vector if SHADOW_USE_ONLY_VIEW_BASED_BIASING is defined, otherwise uses the normal.
 #define SHADOW_USE_SAMPLE_BIASING               1   // Enable per sample biasing for wide multi-tap PCF filters. Incompatible with SHADOW_USE_ONLY_VIEW_BASED_BIASING.
+#define SHADOW_USE_DEPTH_BIAS                   0   // Enable clip space z biasing
 
 #include "ShadowContext.hlsl"