From 7e0de354c2b219236ffaeaea35c87114d23ffd44 Mon Sep 17 00:00:00 2001
From: myT <>
Date: Sat, 25 Feb 2023 23:01:11 +0100
Subject: [PATCH] added the R_SetPVSCulling extension

---
 code/client/cl_cgame.cpp   | 5 +++++
 code/qcommon/cg_public.h   | 3 ++-
 code/renderer/tr_init.cpp  | 8 ++++++++
 code/renderer/tr_local.h   | 2 ++
 code/renderer/tr_public.h  | 3 +++
 code/renderer/tr_world.cpp | 8 +++++++-
 6 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/code/client/cl_cgame.cpp b/code/client/cl_cgame.cpp
index 97acc6a..4046333 100644
--- a/code/client/cl_cgame.cpp
+++ b/code/client/cl_cgame.cpp
@@ -356,6 +356,7 @@ static qbool CL_CG_GetValue( char* value, int valueSize, const char* key )
 		{ "trap_CNQ3_NDP_StartVideo", CG_EXT_NDP_STARTVIDEO },
 		{ "trap_CNQ3_NDP_StopVideo", CG_EXT_NDP_STOPVIDEO },
 		{ "trap_CNQ3_R_RenderScene", CG_EXT_R_RENDERSCENE },
+		{ "trap_CNQ3_R_SetPVSCulling", CG_EXT_R_SETPVSCULLING },
 		// commands
 		{ "screenshotnc", 1 },
 		{ "screenshotncJPEG", 1 },
@@ -708,6 +709,10 @@ static intptr_t CL_CgameSystemCalls( intptr_t *args )
 		re.RenderScene( VMA(1), args[2] );
 		return 0;
 
+	case CG_EXT_R_SETPVSCULLING:
+		re.SetPVSCulling( (qbool)args[1] );
+		return 0;
+
 	default:
 		Com_Error( ERR_DROP, "Bad cgame system trap: %i", args[0] );
 	}
diff --git a/code/qcommon/cg_public.h b/code/qcommon/cg_public.h
index 88144f8..089582d 100644
--- a/code/qcommon/cg_public.h
+++ b/code/qcommon/cg_public.h
@@ -202,7 +202,8 @@ typedef enum {
 	CG_EXT_NDP_READUNTIL,
 	CG_EXT_NDP_STARTVIDEO,
 	CG_EXT_NDP_STOPVIDEO,
-	CG_EXT_R_RENDERSCENE
+	CG_EXT_R_RENDERSCENE,
+	CG_EXT_R_SETPVSCULLING
 } cgameImport_t;
 
 
diff --git a/code/renderer/tr_init.cpp b/code/renderer/tr_init.cpp
index 82cbbfe..8e9b625 100644
--- a/code/renderer/tr_init.cpp
+++ b/code/renderer/tr_init.cpp
@@ -683,6 +683,12 @@ static qbool RE_IsDepthClampEnabled()
 }
 
 
+static void RE_SetPVSCulling( qbool enable )
+{
+	tr.drawEntireMap = !enable;
+}
+
+
 const refexport_t* GetRefAPI( const refimport_t* rimp )
 {
 	static refexport_t re;
@@ -736,5 +742,7 @@ const refexport_t* GetRefAPI( const refimport_t* rimp )
 
 	re.DepthClamp = RE_IsDepthClampEnabled;
 
+	re.SetPVSCulling = RE_SetPVSCulling;
+
 	return &re;
 }
diff --git a/code/renderer/tr_local.h b/code/renderer/tr_local.h
index 177c91a..74ebd16 100644
--- a/code/renderer/tr_local.h
+++ b/code/renderer/tr_local.h
@@ -936,6 +936,8 @@ typedef struct {
 	float		mipFilter[4]; // only used by the GPU generators
 
 	qbool		worldSurface; // is the currently added draw surface a world surface?
+
+	qbool		drawEntireMap;
 } trGlobals_t;
 
 extern backEndState_t	backEnd;
diff --git a/code/renderer/tr_public.h b/code/renderer/tr_public.h
index e5422f7..a39525f 100644
--- a/code/renderer/tr_public.h
+++ b/code/renderer/tr_public.h
@@ -170,6 +170,9 @@ typedef struct {
 
 	// is depth clamping enabled?
 	qbool	(*DepthClamp)();
+
+	// qfalse will force drawing the entire map
+	void	(*SetPVSCulling)( qbool enable );
 } refexport_t;
 
 //
diff --git a/code/renderer/tr_world.cpp b/code/renderer/tr_world.cpp
index 183e890..abae9c8 100644
--- a/code/renderer/tr_world.cpp
+++ b/code/renderer/tr_world.cpp
@@ -512,6 +512,12 @@ static void R_MarkLeaves()
 		return;
 	}
 
+	// when playing a demo on a different map, the area masks might not match
+	// it's safest to ignore the demo's area mask and mark all nodes as visible
+	if ( tr.drawEntireMap ) {
+		tr.refdef.areamaskModified = qtrue;
+	}
+
 	// current viewcluster
 	leaf = R_PointInLeaf( tr.viewParms.pvsOrigin );
 	cluster = leaf->cluster;
@@ -528,7 +534,7 @@ static void R_MarkLeaves()
 	tr.visCount++;
 	tr.viewCluster = cluster;
 
-	if ( r_novis->integer || tr.viewCluster == -1 ) {
+	if ( r_novis->integer || tr.viewCluster == -1 || tr.drawEntireMap ) {
 		for ( i = 0; i < tr.world->numnodes; ++i ) {
 			if (tr.world->nodes[i].contents != CONTENTS_SOLID) {
 				tr.world->nodes[i].visframe = tr.visCount;