From 4e968d9c4c458d76b14be5b4a57644a67979b7f4 Mon Sep 17 00:00:00 2001
From: Rachael Alexanderson <raa-eruanna@users.noreply.github.com>
Date: Sat, 2 Jun 2018 05:03:27 -0400
Subject: [PATCH] - activate r_line_distance_cull in the hardware renderer

---
 src/hwrenderer/scene/hw_bsp.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/src/hwrenderer/scene/hw_bsp.cpp b/src/hwrenderer/scene/hw_bsp.cpp
index 4393424c1..8f561c289 100644
--- a/src/hwrenderer/scene/hw_bsp.cpp
+++ b/src/hwrenderer/scene/hw_bsp.cpp
@@ -75,6 +75,21 @@ void HWDrawInfo::UnclipSubsector(subsector_t *sub)
 //
 //==========================================================================
 
+EXTERN_CVAR(Float, r_line_distance_cull)
+
+inline bool IsDistanceCulled(seg_t *line)
+{
+	double dist3 = r_line_distance_cull * r_line_distance_cull;
+	if (dist3 <= 0.0)
+		return false;
+
+	double dist1 = (line->v1->fPos() - r_viewpoint.Pos).LengthSquared();
+	double dist2 = (line->v2->fPos() - r_viewpoint.Pos).LengthSquared();
+	if ((dist1 > dist3) && (dist2 > dist3))
+		return true;
+	return false;
+}
+
 void HWDrawInfo::AddLine (seg_t *seg, bool portalclip)
 {
 #ifdef _DEBUG
@@ -123,6 +138,8 @@ void HWDrawInfo::AddLine (seg_t *seg, bool portalclip)
 
 	uint8_t ispoly = uint8_t(seg->sidedef->Flags & WALLF_POLYOBJ);
 
+	if (IsDistanceCulled(seg)) { clipper.SafeAddClipRange(startAngle, endAngle); return; }
+
 	if (!seg->backsector)
 	{
 		clipper.SafeAddClipRange(startAngle, endAngle);