From ac3dd146c7cf238df536f47d2649e276cbaf798f Mon Sep 17 00:00:00 2001
From: MascaraSnake <jonassauer27@gmail.com>
Date: Sun, 12 Dec 2021 07:02:17 +0100
Subject: [PATCH] Expose blendmodes to UDMF

---
 extras/conf/udb/Includes/SRB222_common.cfg |  4 ++--
 extras/conf/udb/Includes/SRB222_misc.cfg   |  9 ++++++---
 src/p_setup.c                              | 13 +++++++++++++
 3 files changed, 21 insertions(+), 5 deletions(-)

diff --git a/extras/conf/udb/Includes/SRB222_common.cfg b/extras/conf/udb/Includes/SRB222_common.cfg
index d67835aeb..b752e3654 100644
--- a/extras/conf/udb/Includes/SRB222_common.cfg
+++ b/extras/conf/udb/Includes/SRB222_common.cfg
@@ -264,10 +264,10 @@ mapformat_udmf
 	}
 
 	// LINEDEF RENDERSTYLES
-	/*linedefrenderstyles
+	linedefrenderstyles
 	{
 		include("SRB222_misc.cfg", "linedefrenderstyles");
-	}*/
+	}
 
 	// THING FLAGS
 	thingflags
diff --git a/extras/conf/udb/Includes/SRB222_misc.cfg b/extras/conf/udb/Includes/SRB222_misc.cfg
index 68629149e..1b4fb4b4b 100644
--- a/extras/conf/udb/Includes/SRB222_misc.cfg
+++ b/extras/conf/udb/Includes/SRB222_misc.cfg
@@ -63,11 +63,14 @@ linedefflags_udmf
 	transfer = "Transfer Line";
 }
 
-/*linedefrenderstyles
+linedefrenderstyles
 {
 	translucent = "Translucent";
-	fog = "Fog";
-}*/
+	add = "Add";
+	subtract = "Subtract";
+	reversesubtract = "Reverse subtract";
+	modulate = "Modulate";
+}
 
 sectorflags
 {
diff --git a/src/p_setup.c b/src/p_setup.c
index 6320edc22..6f0e11c03 100644
--- a/src/p_setup.c
+++ b/src/p_setup.c
@@ -1701,6 +1701,19 @@ static void ParseTextmapLinedefParameter(UINT32 i, char *param, char *val)
 		lines[i].sidenum[1] = atol(val);
 	else if (fastcmp(param, "alpha"))
 		lines[i].alpha = FLOAT_TO_FIXED(atof(val));
+	else if (fastcmp(param, "blendmode") || fastcmp(param, "renderstyle"))
+	{
+		if (fastcmp(val, "translucent"))
+			lines[i].blendmode = AST_COPY;
+		else if (fastcmp(val, "add"))
+			lines[i].blendmode = AST_ADD;
+		else if (fastcmp(val, "subtract"))
+			lines[i].blendmode = AST_SUBTRACT;
+		else if (fastcmp(val, "reversesubtract"))
+			lines[i].blendmode = AST_REVERSESUBTRACT;
+		else if (fastcmp(val, "modulate"))
+			lines[i].blendmode = AST_MODULATE;
+	}
 	else if (fastcmp(param, "executordelay"))
 		lines[i].executordelay = atol(val);