From 5d050ca02079957cdd977787dfaa1ac58b12b440 Mon Sep 17 00:00:00 2001
From: ExMatics HydrogenC <33123710+HydrogenC@users.noreply.github.com>
Date: Wed, 5 Jun 2024 21:51:07 +0800
Subject: [PATCH] Make reverse z define dynamic

---
 .../ShadersCompilation/ShaderCompiler.cpp       |  3 +++
 Source/Shaders/Common.hlsl                      | 17 +++++++++--------
 2 files changed, 12 insertions(+), 8 deletions(-)

diff --git a/Source/Engine/ShadersCompilation/ShaderCompiler.cpp b/Source/Engine/ShadersCompilation/ShaderCompiler.cpp
index 72e3aacf8..eba3bd2ed 100644
--- a/Source/Engine/ShadersCompilation/ShaderCompiler.cpp
+++ b/Source/Engine/ShadersCompilation/ShaderCompiler.cpp
@@ -264,6 +264,9 @@ bool ShaderCompiler::OnCompileBegin()
     const auto profile = GetProfile();
     const auto featureLevel = RenderTools::GetFeatureLevel(profile);
     _globalMacros.Add({ "FEATURE_LEVEL", Numbers[(int32)featureLevel] });
+#if FLAX_REVERSE_Z
+    _globalMacros.Add({ "FLAX_REVERSE_Z", "1"});
+#endif
 
     return false;
 }
diff --git a/Source/Shaders/Common.hlsl b/Source/Shaders/Common.hlsl
index d0c5ee858..433832698 100644
--- a/Source/Shaders/Common.hlsl
+++ b/Source/Shaders/Common.hlsl
@@ -4,22 +4,26 @@
 #define __COMMON__
 
 // Platform macros
-#if !defined(DIRECTX)
+#ifndef DIRECTX
 #define DIRECTX 0
 #endif
-#if !defined(OPENGL)
+#ifndef OPENGL
 #define OPENGL 0
 #endif
-#if !defined(VULKAN)
+#ifndef VULKAN
 #define VULKAN 0
 #endif
-#if defined(PLATFORM_PS4)
+#ifdef PLATFORM_PS4
 #include "./FlaxPlatforms/PS4/Shaders/PS4Common.hlsl"
 #endif
-#if defined(PLATFORM_PS5)
+#ifdef PLATFORM_PS5
 #include "./FlaxPlatforms/PS5/Shaders/PS5Common.hlsl"
 #endif
 
+#ifndef FLAX_REVERSE_Z
+#define FLAX_REVERSE_Z 0
+#endif
+
 // Feature levels
 #define FEATURE_LEVEL_ES2 0
 #define FEATURE_LEVEL_ES3 1
@@ -53,9 +57,6 @@
 #define SHADING_MODEL_SUBSURFACE 2
 #define SHADING_MODEL_FOLIAGE 3
 
-// Didn't figure out how to pass compilation flags via C++, so hardcode it temporarily
-#define FLAX_REVERSE_Z 1
-
 // Detect feature level support
 #if FEATURE_LEVEL >= FEATURE_LEVEL_SM5
 #define CAN_USE_GATHER 1