From 7c310cd7f5c30bde9b38fb817ba99060c7b4e96e Mon Sep 17 00:00:00 2001
From: ExeVirus <44562154+ExeVirus@users.noreply.github.com>
Date: Sun, 16 Nov 2025 08:59:33 -0500
Subject: [PATCH]  OpenGL3: Add subpixel offset for 2D rendering (#16676)

---
 client/shaders/Irrlicht/Renderer2D.vsh | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/client/shaders/Irrlicht/Renderer2D.vsh b/client/shaders/Irrlicht/Renderer2D.vsh
index c0916562b..0d9c1ba60 100644
--- a/client/shaders/Irrlicht/Renderer2D.vsh
+++ b/client/shaders/Irrlicht/Renderer2D.vsh
@@ -18,7 +18,10 @@ varying vec4 vVertexColor;
 
 void main()
 {
-	gl_Position = uProjection * inVertexPosition;
+	// Subpixel offset to render pixel-perfect 2D images
+	// This is a compromise that is expected to work well on most drivers.
+	// Explanation: https://jvm-gaming.org/t/pixel-perfect-rendering-in-2d/26261/4
+	gl_Position = uProjection * (inVertexPosition + vec4(0.375, 0.375, 0.0, 0.0));
 	gl_PointSize = uThickness;
 	vTextureCoord = inTexCoord0;
 	vVertexColor = inVertexColor.bgra;