From e0365c1d10f2a2849fe54795b140a35c5a81ce69 Mon Sep 17 00:00:00 2001
From: lightningterror <18107717+lightningterror@users.noreply.github.com>
Date: Thu, 28 May 2026 15:24:02 +0200
Subject: [PATCH] GS/GL: Discard stencil when not in use while using depth.

Backport from DX12, clear the stencil when it's not used.
---
 pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp b/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
index 1acd198cc1..c1fd689523 100644
--- a/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
+++ b/pcsx2/GS/Renderers/OpenGL/GSDeviceOGL.cpp
@@ -2963,6 +2963,12 @@ void GSDeviceOGL::RenderHW(GSHWDrawConfig& config)
 		constexpr GLint clear_color = 1;
 		glClearBufferiv(GL_STENCIL, 0, &clear_color);
 	}
+	else if (draw_ds && !(config.destination_alpha == GSHWDrawConfig::DestinationAlphaMode::Stencil ||
+			config.destination_alpha == GSHWDrawConfig::DestinationAlphaMode::StencilOne))
+	{
+		const GLenum attachments[] = {GL_STENCIL_ATTACHMENT};
+		glInvalidateFramebuffer(GL_DRAW_FRAMEBUFFER, std::size(attachments), attachments);
+	}
 
 	SendHWDraw(config, rt_feedbackloop_pass1 ? draw_rt_clone : nullptr, draw_rt, ds_feedbackloop_pass1 ? draw_ds_clone : nullptr, draw_ds,
 		config.require_one_barrier, config.require_full_barrier);