From 275d818cd4f064bb981edcec7b4a4a9f6b4d2280 Mon Sep 17 00:00:00 2001
From: PabloMK7 <hackyglitch2@gmail.com>
Date: Mon, 22 Dec 2025 15:48:47 +0100
Subject: [PATCH] video_core: Change unimplemented gas stub behaviour (#1525)

---
 src/video_core/shader/generator/glsl_fs_shader_gen.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/video_core/shader/generator/glsl_fs_shader_gen.cpp b/src/video_core/shader/generator/glsl_fs_shader_gen.cpp
index 96be02d05..463fe1950 100644
--- a/src/video_core/shader/generator/glsl_fs_shader_gen.cpp
+++ b/src/video_core/shader/generator/glsl_fs_shader_gen.cpp
@@ -1,4 +1,4 @@
-// Copyright 2023 Citra Emulator Project
+// Copyright Citra Emulator Project / Azahar Emulator Project
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
@@ -172,6 +172,7 @@ vec4 secondary_fragment_color = vec4(0.0);
         break;
     case TexturingRegs::FogMode::Gas:
         WriteGas();
+        // Return early due to unimplemented gas mode
         return out;
     default:
         break;
@@ -832,7 +833,10 @@ void FragmentModule::WriteFog() {
 void FragmentModule::WriteGas() {
     // TODO: Implement me
     LOG_CRITICAL(Render, "Unimplemented gas mode");
-    out += "discard; }";
+    // Replace the output color with a transparent pixel,
+    // (just discarding the pixel causes graphical issues
+    // in some MH games).
+    out += "color = vec4(0.0); }";
 }
 
 void FragmentModule::WriteShadow() {