From b7c037224665ac826490c142b800b11dfc4acf49 Mon Sep 17 00:00:00 2001
From: Skyth <19259897+blueskythlikesclouds@users.noreply.github.com>
Date: Fri, 8 Nov 2024 20:16:24 +0300
Subject: [PATCH] Implement reverse Z negation.

---
 ShaderRecomp/shader_recompiler.cpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/ShaderRecomp/shader_recompiler.cpp b/ShaderRecomp/shader_recompiler.cpp
index 7169cc0..79b537b 100644
--- a/ShaderRecomp/shader_recompiler.cpp
+++ b/ShaderRecomp/shader_recompiler.cpp
@@ -245,11 +245,14 @@ void ShaderRecompiler::recompile(const TextureFetchInstruction& instr, bool bicu
 
     std::string constName;
     const char* constNamePtr = nullptr;
+    bool subtractFromOne = false;
 
     auto findResult = samplers.find(instr.constIndex);
     if (findResult != samplers.end())
     {
         constNamePtr = findResult->second;
+        subtractFromOne = strcmp(constNamePtr, "sampZBuffer") == 0 ||
+            strcmp(constNamePtr, "g_DepthSampler") == 0;
     }
     else
     {
@@ -273,12 +276,18 @@ void ShaderRecompiler::recompile(const TextureFetchInstruction& instr, bool bicu
     switch (instr.opcode)
     {
     case FetchOpcode::TextureFetch:
+    {
+        if (subtractFromOne)
+            out += "1.0 - ";
         out += "tfetch";
         break;
+    }
     case FetchOpcode::GetTextureWeights:
+    {
         out += "getWeights";
         break;
     }
+    }
 
     std::string_view dimension;
     uint32_t componentCount = 0;