From 9733de70677c90160d0200bc4064077850a9c367 Mon Sep 17 00:00:00 2001
From: Nico de Poel <ndepoel@gmail.com>
Date: Sun, 26 Feb 2023 12:45:36 +0100
Subject: [PATCH] Added some quick hacks to allow the shaders to compile for
 Metal. These "interlocked" functions are not interlocked anymore now, but
 it's good enough for an initial test on MacOS.

---
 .../FSR2/ffx_fsr2_compute_luminance_pyramid_pass.compute     | 4 ++++
 .../FSR2/ffx_fsr2_reconstruct_previous_depth_pass.compute    | 5 +++++
 2 files changed, 9 insertions(+)

diff --git a/Assets/Resources/FSR2/ffx_fsr2_compute_luminance_pyramid_pass.compute b/Assets/Resources/FSR2/ffx_fsr2_compute_luminance_pyramid_pass.compute
index c1346ca..b18636d 100644
--- a/Assets/Resources/FSR2/ffx_fsr2_compute_luminance_pyramid_pass.compute
+++ b/Assets/Resources/FSR2/ffx_fsr2_compute_luminance_pyramid_pass.compute
@@ -12,4 +12,8 @@
 #define FFX_HLSL        // Compile for plain HLSL
 #define SPD_NO_WAVE_OPERATIONS  // Wave operations require shader model 6.0; this works with #pragma use_dxc but only on D3D12
 
+#if SHADER_API_METAL
+#define InterlockedAdd(dest, val, orig)     { (orig) = (dest); (dest) += (val); }
+#endif
+
 #include "shaders/ffx_fsr2_compute_luminance_pyramid_pass.hlsl"
diff --git a/Assets/Resources/FSR2/ffx_fsr2_reconstruct_previous_depth_pass.compute b/Assets/Resources/FSR2/ffx_fsr2_reconstruct_previous_depth_pass.compute
index 1cad881..3bb6e5a 100644
--- a/Assets/Resources/FSR2/ffx_fsr2_reconstruct_previous_depth_pass.compute
+++ b/Assets/Resources/FSR2/ffx_fsr2_reconstruct_previous_depth_pass.compute
@@ -11,4 +11,9 @@
 #define FFX_GPU         // Compiling for GPU
 #define FFX_HLSL        // Compile for plain HLSL
 
+#if SHADER_API_METAL
+#define InterlockedMin(dest, val)       { (dest) = min((dest), (val)); }
+#define InterlockedMax(dest, val)       { (dest) = max((dest), (val)); }
+#endif
+
 #include "shaders/ffx_fsr2_reconstruct_previous_depth_pass.hlsl"