Use implicit register binding for fragment shader random write targets. Fixes UAVs not binding properly on PS5.

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/ASR/Shaders/shaders/fsr2/ffxm_fsr2_callbacks_hlsl.h

@@ -379,7 +379,11 @@ SamplerState s_LinearClamp : register(s1);
 
     // UAV declarations
     #if defined FSR2_BIND_UAV_RECONSTRUCTED_PREV_NEAREST_DEPTH
+        #if defined(SHADER_API_PSSL)
+        RWTexture2D<FfxUInt32> rw_reconstructed_previous_nearest_depth;     // Need to use implicit register binding for random write targets on PS4/5
+        #else
         RWTexture2D<FfxUInt32> rw_reconstructed_previous_nearest_depth : FFXM_FSR2_DECLARE_UAV(FSR2_BIND_UAV_RECONSTRUCTED_PREV_NEAREST_DEPTH);
+        #endif
     #endif
     #if defined FSR2_BIND_UAV_DILATED_MOTION_VECTORS
         RWTexture2D<FfxFloat32x2> rw_dilated_motion_vectors : FFXM_FSR2_DECLARE_UAV(FSR2_BIND_UAV_DILATED_MOTION_VECTORS);