From 03ec537178bd20a99033d1b83a72effe46ddffbb Mon Sep 17 00:00:00 2001
From: James R <justsomejames2@gmail.com>
Date: Sun, 2 Apr 2023 01:10:14 -0700
Subject: [PATCH] Add debugrender_portal command

- Fills portals with red
- Draws portals over planes and masked
---
 src/r_debug.cpp |  1 +
 src/r_main.c    | 29 ++++++++++++++++++++++++++++-
 src/r_main.h    |  3 ++-
 3 files changed, 31 insertions(+), 2 deletions(-)

diff --git a/src/r_debug.cpp b/src/r_debug.cpp
index bb7590a5c..2c77d162b 100644
--- a/src/r_debug.cpp
+++ b/src/r_debug.cpp
@@ -33,6 +33,7 @@ consvar_t cv_debugrender_contrast =
 	CVAR_INIT("debugrender_contrast", "0.0", CV_CHEAT | CV_FLOAT, contrast_cons_t, nullptr);
 
 consvar_t cv_debugrender_spriteclip = CVAR_INIT("debugrender_spriteclip", "Off", CV_CHEAT, CV_OnOff, nullptr);
+consvar_t cv_debugrender_portal = CVAR_INIT("debugrender_portal", "Off", CV_CHEAT, CV_OnOff, nullptr);
 
 UINT32 debugrender_highlight;
 
diff --git a/src/r_main.c b/src/r_main.c
index 5a0bb0db2..5731f7695 100644
--- a/src/r_main.c
+++ b/src/r_main.c
@@ -1567,7 +1567,7 @@ void R_RenderPlayerView(void)
 
 	// Portal rendering. Hijacks the BSP traversal.
 	ps_sw_portaltime = I_GetPreciseTime();
-	if (portal_base)
+	if (portal_base && !cv_debugrender_portal.value)
 	{
 		portal_t *portal;
 
@@ -1622,6 +1622,32 @@ void R_RenderPlayerView(void)
 	R_DrawMasked(masks, nummasks);
 	ps_sw_maskedtime = I_GetPreciseTime() - ps_sw_maskedtime;
 
+	// debugrender_portal: fill portals with red, draw over everything
+	if (portal_base && cv_debugrender_portal.value)
+	{
+		const UINT8 pal = 0x23; // red
+		portal_t *portal;
+
+		for(portal = portal_base; portal; portal = portal_base)
+		{
+			INT32 width = (portal->end - portal->start);
+			INT32 i;
+
+			for (i = 0; i < width; ++i)
+			{
+				INT32 yl = max(portal->ceilingclip[i] + 1, 0);
+				INT32 yh = min(portal->floorclip[i], viewheight);
+
+				for (; yl < yh; ++yl)
+				{
+					screens[0][portal->start + i + (yl * vid.width)] = pal;
+				}
+			}
+
+			Portal_Remove(portal);
+		}
+	}
+
 	free(masks);
 }
 
@@ -1685,6 +1711,7 @@ void R_RegisterEngineStuff(void)
 
 	CV_RegisterVar(&cv_debugrender_contrast);
 	CV_RegisterVar(&cv_debugrender_spriteclip);
+	CV_RegisterVar(&cv_debugrender_portal);
 
 	COM_AddCommand("debugrender_highlight", Command_Debugrender_highlight);
 }
diff --git a/src/r_main.h b/src/r_main.h
index 62d6cd1d3..786b1eaf6 100644
--- a/src/r_main.h
+++ b/src/r_main.h
@@ -148,7 +148,8 @@ void Command_Debugrender_highlight(void);
 
 extern consvar_t
 	cv_debugrender_contrast,
-	cv_debugrender_spriteclip;
+	cv_debugrender_spriteclip,
+	cv_debugrender_portal;
 
 // Called by startup code.
 void R_Init(void);