From f9d4ac2771dbf2405ba94331fc3c5229d71cb291 Mon Sep 17 00:00:00 2001
From: Alibek Omarov <a1ba.omarov@gmail.com>
Date: Thu, 30 Jan 2025 18:52:26 +0300
Subject: [PATCH] ref: gl: fix ugly seam at the skybox, thanks Spoike for help

---
 ref/gl/gl_warp.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/ref/gl/gl_warp.c b/ref/gl/gl_warp.c
index 05fa1495..34d05a71 100644
--- a/ref/gl/gl_warp.c
+++ b/ref/gl/gl_warp.c
@@ -247,8 +247,16 @@ static void MakeSkyVec( float s, float t, int axis )
 	s = (s + 1.0f) * 0.5f;
 	t = (t + 1.0f) * 0.5f;
 
-	s = bound( 1.0f / 512.0f, s, 511.0f / 512.0f );
-	t = bound( 1.0f / 512.0f, t, 511.0f / 512.0f );
+	if( GL_Support( GL_CLAMPTOEDGE_EXT ))
+	{
+		s = bound( 0.0f, s, 1.0f );
+		t = bound( 0.0f, t, 1.0f );
+	}
+	else
+	{
+		s = bound( 1.0f / 512.0f, s, 511.0f / 512.0f );
+		t = bound( 1.0f / 512.0f, t, 511.0f / 512.0f );
+	}
 
 	t = 1.0f - t;