Added macros to change nearest-depth and depth-clipping logic based on whether the Unity graphics API uses reversed Z or not

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/2_pass_cs/sgsr2_convert.compute

@@ -38,16 +38,16 @@ void CS(uint3 gl_GlobalInvocationID : SV_DispatchThreadID)
     float4 bottomLeft = GATHER_RED_TEXTURE2D_X(InputDepth, S_POINT_CLAMP, (gatherCoord+v12));
     float2 v14 = float2(ViewportSizeInverse.x*2.0, ViewportSizeInverse.y*2.0);
     float4 bottomRight = GATHER_RED_TEXTURE2D_X(InputDepth, S_POINT_CLAMP, (gatherCoord+v14));
-    float maxC = max(max(max(topleft.y,topRight.x),bottomLeft.z),bottomRight.w);
-    float topleft4 = max(max(max(topleft.y,topleft.x),topleft.z),topleft.w);
-    float topLeftMax9 = max(bottomLeft.w,max(max(maxC,topleft4),topRight.w));
+    float maxC = DEPTH_NEAREST(DEPTH_NEAREST(DEPTH_NEAREST(topleft.y,topRight.x),bottomLeft.z),bottomRight.w);
+    float topleft4 = DEPTH_NEAREST(DEPTH_NEAREST(DEPTH_NEAREST(topleft.y,topleft.x),topleft.z),topleft.w);
+    float topLeftMax9 = DEPTH_NEAREST(bottomLeft.w,DEPTH_NEAREST(DEPTH_NEAREST(maxC,topleft4),topRight.w));
 
     float depthclip = 0.0;
-    if (maxC > 1.0e-05f)
+    if (DEPTH_CLIP(maxC))
     {
-        float topRight4 = max(max(max(topRight.y,topRight.x),topRight.z),topRight.w);
-        float bottomLeft4 = max(max(max(bottomLeft.y,bottomLeft.x),bottomLeft.z),bottomLeft.w);
-        float bottomRight4 = max(max(max(bottomRight.y,bottomRight.x),bottomRight.z),bottomRight.w);
+        float topRight4 = DEPTH_NEAREST(DEPTH_NEAREST(DEPTH_NEAREST(topRight.y,topRight.x),topRight.z),topRight.w);
+        float bottomLeft4 = DEPTH_NEAREST(DEPTH_NEAREST(DEPTH_NEAREST(bottomLeft.y,bottomLeft.x),bottomLeft.z),bottomLeft.w);
+        float bottomRight4 = DEPTH_NEAREST(DEPTH_NEAREST(DEPTH_NEAREST(bottomRight.y,bottomRight.x),bottomRight.z),bottomRight.w);
 
         float Wdepth = 0.0;
         float Ksep = 1.37e-05f;

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/3_pass_cs/sgsr2_activate.compute

@@ -47,7 +47,7 @@ void CS(uint3 gl_GlobalInvocationID : SV_DispatchThreadID)
  #endif
     float depthclip = 0.0;
 
-    if (depth > 1.0e-05f) {
+    if (DEPTH_CLIP(depth)) {
         float2 Prevf_sample = PrevUV * float2(renderSize) - 0.5f;
         float2 Prevfrac = Prevf_sample - floor(Prevf_sample);
         float OneMinusPrevfacx = 1.0 - Prevfrac.x;

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/3_pass_cs/sgsr2_convert.compute

@@ -36,22 +36,22 @@ void CS(uint3 gl_GlobalInvocationID : SV_DispatchThreadID)
     
     float4 topleft = GATHER_RED_TEXTURE2D_X(InputDepth, S_POINT_CLAMP, gatherCoord);
 
-    NearestZ = max(topleft.x, NearestZ);
-    NearestZ = max(topleft.y, NearestZ);
-    NearestZ = max(topleft.z, NearestZ);
-    NearestZ = max(topleft.w, NearestZ);
+    NearestZ = DEPTH_NEAREST(topleft.x, NearestZ);
+    NearestZ = DEPTH_NEAREST(topleft.y, NearestZ);
+    NearestZ = DEPTH_NEAREST(topleft.z, NearestZ);
+    NearestZ = DEPTH_NEAREST(topleft.w, NearestZ);
 
     float2 v11 = float2(renderSizeRcp.x, 0.0);
     float2 topRight = GATHER_RED_TEXTURE2D_X(InputDepth, S_POINT_CLAMP, (gatherCoord + v11)).yz;
 
-    NearestZ = max(topRight.x, NearestZ);
-    NearestZ = max(topRight.y, NearestZ);
+    NearestZ = DEPTH_NEAREST(topRight.x, NearestZ);
+    NearestZ = DEPTH_NEAREST(topRight.y, NearestZ);
 
     float2 v13 = float2(0.0, renderSizeRcp.y);
     float2 bottomLeft = GATHER_RED_TEXTURE2D_X(InputDepth, S_POINT_CLAMP, (gatherCoord + v13)).xy;
 
-    NearestZ = max(bottomLeft.x, NearestZ);
-    NearestZ = max(bottomLeft.y, NearestZ);
+    NearestZ = DEPTH_NEAREST(bottomLeft.x, NearestZ);
+    NearestZ = DEPTH_NEAREST(bottomLeft.y, NearestZ);
 
     //refer to ue/fsr2 PostProcessFFX_FSR2ConvertVelocity.usf, and using nearest depth for dilated motion
 

Packages/com.unity.postprocessing@3.2.2/PostProcessing/Runtime/Effects/Upscaling/SGSR2/Shaders/sgsr2_common.hlsl

@@ -1,5 +1,13 @@
 #define EPSILON 1.192e-07f
 
+#ifdef UNITY_REVERSED_Z
+#define DEPTH_NEAREST(a, b)     max((a), (b))
+#define DEPTH_CLIP(depth)       ((depth) > 1.0e-05f)
+#else
+#define DEPTH_NEAREST(a, b)     min((a), (b))
+#define DEPTH_CLIP(depth)       ((depth) < 1.0f - 1.0e-05f)
+#endif
+
 cbuffer Params : register(b0)
 {
     uint2                renderSize;