From cc86eaf27b63c6e1a02dc170556703c939add4b7 Mon Sep 17 00:00:00 2001
From: Justin <95296300+Toodles2You@users.noreply.github.com>
Date: Tue, 3 Feb 2026 16:28:54 -0800
Subject: [PATCH] Expose horizontal model flipping to QC

---
 engine/client/pr_csqc.c   | 2 ++
 engine/client/pr_menu.c   | 2 ++
 engine/common/pr_common.h | 1 +
 engine/server/pr_cmds.c   | 1 +
 4 files changed, 6 insertions(+)

diff --git a/engine/client/pr_csqc.c b/engine/client/pr_csqc.c
index 07ad698bc..4000ab0dc 100644
--- a/engine/client/pr_csqc.c
+++ b/engine/client/pr_csqc.c
@@ -793,6 +793,8 @@ static qboolean CopyCSQCEdictToEntity(csqcedict_t *fte_restrict in, entity_t *ft
 		if (rflags & CSQCRF_NOSHADOW)
 			out->flags |= RF_NOSHADOW;
 		//CSQCRF_FRAMETIMESARESTARTTIMES is handled by cs_getframestate below
+		if (rflags & CSQCRF_XFLIP)
+			out->flags |= RF_XFLIP;
 
 //		if (rflags & CSQCRF_REMOVED)
 //			Con_Printf("Warning: CSQCRF_NOAUTOADD is no longer supported\n");
diff --git a/engine/client/pr_menu.c b/engine/client/pr_menu.c
index 0fbf8645f..7fe5952a1 100644
--- a/engine/client/pr_menu.c
+++ b/engine/client/pr_menu.c
@@ -2273,6 +2273,8 @@ static qboolean CopyMenuEdictToEntity(pubprogfuncs_t *prinst, menuedict_t *in, e
 		out->flags |= RF_ADDITIVE;
 	if (rflags & CSQCRF_DEPTHHACK)
 		out->flags |= RF_DEPTHHACK;
+	if (rflags & CSQCRF_XFLIP)
+		out->flags |= RF_XFLIP;
 
 	if (out->model)
 		return true;
diff --git a/engine/common/pr_common.h b/engine/common/pr_common.h
index cf00c3e3e..2dbd5d06d 100644
--- a/engine/common/pr_common.h
+++ b/engine/common/pr_common.h
@@ -877,6 +877,7 @@ typedef enum
 #define CSQCRF_NOSHADOW					32 //don't cast shadows upon other entities (can still be self shadowing, if the engine wishes, and not additive)
 #define CSQCRF_FRAMETIMESARESTARTTIMES	64 //EXT_CSQC_1: frame times should be read as (time-frametime).
 #define CSQCRF_FIRSTPERSON				1024 //also not drawn in mirrors, just without the VIEWMODEL hacks attached
+#define CSQCRF_XFLIP					2048 //flip horizontally (for q2's left-handed weapons)
 //#define CSQCRFDP_USETRANSPARENTOFFSET	64 // Allows QC to customize origin used for transparent sorting via transparent_origin global, helps to fix transparent sorting bugs on a very large entities
 ////#define CSQCRF_NOAUTOADD			128 // removed in favour of predraw return values.
 //#define CSQCRFDP_WORLDOBJECT			128 // for large outdoor entities that should not be culled.
diff --git a/engine/server/pr_cmds.c b/engine/server/pr_cmds.c
index 0c7b70eab..bc6a3d817 100644
--- a/engine/server/pr_cmds.c
+++ b/engine/server/pr_cmds.c
@@ -13964,6 +13964,7 @@ void PR_DumpPlatform_f(void)
 		{"RF_NOSHADOW",			"const float", CS, D("This entity will not cast shadows. Often useful on view models."), CSQCRF_NOSHADOW},
 		{"RF_FRAMETIMESARESTARTTIMES","const float", CS, D("Specifies that the frame1time, frame2time field are timestamps (denoting the start of the animation) rather than time into the animation."), CSQCRF_FRAMETIMESARESTARTTIMES},
 		{"RF_FIRSTPERSON","const float", CS, D("This is basically the opposite of RF_EXTERNALMODEL. Don't draw in third-person or mirrors."), CSQCRF_FIRSTPERSON},
+		{"RF_XFLIP",			"const float", CS|MENU, D("Flip the entity horizontally. Useful for left-handed view models."), CSQCRF_XFLIP},
 
 		{"IE_KEYDOWN",			"const float", CS|MENU, D("Specifies that a key was pressed. Second argument is the scan code. Third argument is the unicode (printable) char value. Fourth argument denotes which keyboard(or mouse, if its a mouse 'scan' key) the event came from. Note that some systems may completely separate scan codes and unicode values, with a 0 value for the unspecified argument."), CSIE_KEYDOWN},
 		{"IE_KEYUP",			"const float", CS|MENU, D("Specifies that a key was released. Arguments are the same as IE_KEYDOWN. On some systems, this may be fired instantly after IE_KEYDOWN was fired."), CSIE_KEYUP},