From dd0769de80df8c6a5f2db9b895e48ad7f62d18fd Mon Sep 17 00:00:00 2001
From: nashmuhandes <nashbackslash@gmail.com>
Date: Mon, 16 Mar 2020 22:31:58 +0800
Subject: [PATCH] Opaque blood decals must be defined with 'OpaqueBlood'
 keyword in DECALDEF

---
 src/gamedata/decallib.cpp |  9 ++++++++-
 src/gamedata/decallib.h   |  2 ++
 src/playsim/a_decals.cpp  | 13 +++++++++----
 3 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/src/gamedata/decallib.cpp b/src/gamedata/decallib.cpp
index 6b471492a..6cfffb367 100644
--- a/src/gamedata/decallib.cpp
+++ b/src/gamedata/decallib.cpp
@@ -174,6 +174,7 @@ static const char *DecalKeywords[] =
 	"colors",
 	"animator",
 	"lowerdecal",
+	"opaqueblood",
 	NULL
 };
 
@@ -194,7 +195,8 @@ enum
 	DECAL_SHADE,
 	DECAL_COLORS,
 	DECAL_ANIMATOR,
-	DECAL_LOWERDECAL
+	DECAL_LOWERDECAL,
+	DECAL_OPAQUEBLOOD,
 };
 
 const FDecalTemplate *FDecalBase::GetDecal () const
@@ -473,6 +475,11 @@ void FDecalLib::ParseDecal (FScanner &sc)
 			sc.MustGetString ();
 			newdecal.LowerDecal = GetDecalByName (sc.String);
 			break;
+
+		case DECAL_OPAQUEBLOOD:
+			newdecal.RenderStyle = STYLE_Normal;
+			newdecal.opaqueBlood = true;
+			break;
 		}
 	}
 }
diff --git a/src/gamedata/decallib.h b/src/gamedata/decallib.h
index 75df4ae42..6ffda460b 100644
--- a/src/gamedata/decallib.h
+++ b/src/gamedata/decallib.h
@@ -84,6 +84,8 @@ public:
 	const FDecalBase *LowerDecal;
 
 	enum { DECAL_RandomFlipX = 0x100, DECAL_RandomFlipY = 0x200 };
+
+	bool opaqueBlood;
 };
 
 class FDecalLib
diff --git a/src/playsim/a_decals.cpp b/src/playsim/a_decals.cpp
index a7d9afcc1..8eb4af153 100644
--- a/src/playsim/a_decals.cpp
+++ b/src/playsim/a_decals.cpp
@@ -764,10 +764,11 @@ DImpactDecal *DImpactDecal::StaticCreate (FLevelLocals *Level, const FDecalTempl
 			decal->SetShade (color.r, color.g, color.b);
 		}
 
-		// [Nash] For compatibility reasons, only do this if the 'Shaded' keyword is omitted from the base decal.
-		if (bloodTranslation != 0 && tpl->ShadeColor == 0)
+		// [Nash] opaque blood
+		if (bloodTranslation != 0 && tpl->ShadeColor == 0 && tpl->opaqueBlood)
 		{
 			decal->SetTranslation(bloodTranslation);
+			decal->RenderStyle = STYLE_Normal;
 		}
 
 		if (!cl_spreaddecals || !decal->PicNum.isValid())
@@ -803,8 +804,12 @@ DBaseDecal *DImpactDecal::CloneSelf (const FDecalTemplate *tpl, double ix, doubl
 			tpl->ApplyToDecal (decal, wall);
 			decal->AlphaColor = AlphaColor;
 
-			// [Nash] For compatibility reasons, only do this if the 'Shaded' keyword is omitted from the base decal.
-			if (tpl->ShadeColor == 0) decal->SetTranslation(Translation);
+			// [Nash] opaque blood
+			if (tpl->ShadeColor == 0 && tpl->opaqueBlood)
+			{
+				decal->SetTranslation(Translation);
+				decal->RenderStyle = STYLE_Normal;
+			}
 
 			decal->RenderFlags = (decal->RenderFlags & RF_DECALMASK) |
 								 (this->RenderFlags & ~RF_DECALMASK);