From ddf3f2ffdb645f9a8687498bb6d797bf473e2e85 Mon Sep 17 00:00:00 2001
From: mittorn <mittorn@sibmail.com>
Date: Sun, 15 Oct 2023 03:38:22 +0300
Subject: [PATCH] gl2shim: Allow drawing huge QUADS sequences by splitting
 drawcalls on overflow

---
 ref/gl/gl2_shim/gl2_shim.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/ref/gl/gl2_shim/gl2_shim.c b/ref/gl/gl2_shim/gl2_shim.c
index 279600e9..ecb0c4a2 100644
--- a/ref/gl/gl2_shim/gl2_shim.c
+++ b/ref/gl/gl2_shim/gl2_shim.c
@@ -1065,7 +1065,15 @@ static void APIENTRY GL2_Vertex3f( GLfloat x, GLfloat y, GLfloat z )
 	}
 	++gl2wrap.end;
 
-	if( gl2wrap.end - gl2wrap.begin >= MAX_BEGINEND_VERTS )
+	if( gl2wrap.prim == GL_QUADS )
+	{
+		if( !( ( gl2wrap.end - gl2wrap.begin ) % 4 ) && gl2wrap.end > ( GL2_MAX_VERTS - 4 ) )
+		{
+			GL2_FlushPrims();
+			GL2_Begin( GL_QUADS );
+		}
+	}
+	else if( gl2wrap.end - gl2wrap.begin >= MAX_BEGINEND_VERTS )
 	{
 		GLenum prim = gl2wrap.prim;
 		gEngfuncs.Con_DPrintf( S_ERROR "GL2_Vertex3f: Vertex buffer overflow!\n" );