Added per-thing render hooks

src/events.cpp

@@ -53,6 +53,18 @@ void E_RenderCamera()
 		handler->RenderCamera();
 }
 
+void E_RenderBeforeThing(AActor* thing)
+{
+	for (DEventHandler* handler = E_FirstEventHandler; handler; handler = handler->next)
+		handler->RenderBeforeThing(thing);
+}
+
+void E_RenderAfterThing(AActor* thing)
+{
+	for (DEventHandler* handler = E_FirstEventHandler; handler; handler = handler->next)
+		handler->RenderAfterThing(thing);
+}
+
 // declarations
 IMPLEMENT_CLASS(DEventHandler, false, false);
 IMPLEMENT_CLASS(DRenderEventHandler, false, false);
@@ -62,6 +74,8 @@ DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, ViewAngle);
 DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, ViewPitch);
 DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, ViewRoll);
 DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, FracTic);
+DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, Camera);
+DEFINE_FIELD_X(RenderEventHandler, DRenderEventHandler, CurrentThing);
 
 DEFINE_ACTION_FUNCTION(DEventHandler, Create)
 {
@@ -109,12 +123,12 @@ DEFINE_ACTION_FUNCTION(DEventHandler, Unregister)
 	return 0;
 }
 
-#define DEFINE_EVENT_HANDLER(cls, funcname) DEFINE_ACTION_FUNCTION(cls, funcname) \
+#define DEFINE_EVENT_HANDLER(cls, funcname, args) DEFINE_ACTION_FUNCTION(cls, funcname) \
 { \
 	PARAM_SELF_PROLOGUE(cls); \
 	return 0; \
 } \
-void cls::funcname() \
+void cls::funcname(args) \
 { \
 	IFVIRTUAL(cls, funcname) \
 	{ \
@@ -125,10 +139,12 @@ void cls::funcname() \
 	} \
 }
 
-DEFINE_EVENT_HANDLER(DEventHandler, MapLoaded)
-DEFINE_EVENT_HANDLER(DEventHandler, MapUnloading)
-DEFINE_EVENT_HANDLER(DEventHandler, RenderFrame)
-DEFINE_EVENT_HANDLER(DEventHandler, RenderCamera)
+DEFINE_EVENT_HANDLER(DEventHandler, MapLoaded,)
+DEFINE_EVENT_HANDLER(DEventHandler, MapUnloading,)
+DEFINE_EVENT_HANDLER(DEventHandler, RenderFrame,)
+DEFINE_EVENT_HANDLER(DEventHandler, RenderCamera,)
+DEFINE_EVENT_HANDLER(DEventHandler, RenderBeforeThing, AActor*)
+DEFINE_EVENT_HANDLER(DEventHandler, RenderAfterThing, AActor*)
 
 //
 void DEventHandler::OnDestroy()
@@ -144,6 +160,7 @@ void DRenderEventHandler::Setup()
 	ViewPitch = ::ViewPitch;
 	ViewRoll = ::ViewRoll;
 	FracTic = ::r_TicFracF;
+	Camera = ::camera;
 }
 
 void DRenderEventHandler::RenderFrame()
@@ -157,3 +174,15 @@ void DRenderEventHandler::RenderCamera()
 	Setup();
 	DEventHandler::RenderCamera();
 }
+
+void DRenderEventHandler::RenderBeforeThing(AActor* thing)
+{
+	CurrentThing = thing;
+	DEventHandler::RenderBeforeThing(thing);
+}
+
+void DRenderEventHandler::RenderAfterThing(AActor* thing)
+{
+	CurrentThing = thing;
+	DEventHandler::RenderAfterThing(thing);
+}

src/events.h

@@ -3,6 +3,26 @@
 
 #include "dobject.h"
 
+class DEventHandler;
+
+// register
+void E_RegisterHandler(DEventHandler* handler);
+// unregister
+void E_UnregisterHandler(DEventHandler* handler);
+
+// called right after the map has loaded (approximately same time as OPEN ACS scripts)
+void E_MapLoaded();
+// called when the map is about to unload (approximately same time as UNLOADING ACS scripts)
+void E_MapUnloading();
+// called on each render frame once.
+void E_RenderFrame();
+// called before entering each actor's view (including RenderFrame)
+void E_RenderCamera();
+// called before adding each actor to the render list
+void E_RenderBeforeThing(AActor* thing);
+// called after adding each actor to the render list
+void E_RenderAfterThing(AActor* thing);
+
 class DEventHandler : public DObject // make it a part of normal GC process
 {
 	DECLARE_CLASS(DEventHandler, DObject)
@@ -23,6 +43,10 @@ public:
 	virtual void RenderFrame();
 	// called before entering each actor's view (including RenderFrame)
 	virtual void RenderCamera();
+	// called before adding each actor to the render list
+	virtual void RenderBeforeThing(AActor* thing);
+	// called after adding each actor to the render list
+	virtual void RenderAfterThing(AActor* thing);
 };
 extern DEventHandler* E_FirstEventHandler;
 
@@ -30,31 +54,42 @@ class DRenderEventHandler : public DEventHandler
 {
 	DECLARE_CLASS(DRenderEventHandler, DEventHandler)
 public:
+	// these are for all render events
 	DVector3 ViewPos;
 	DAngle ViewAngle;
 	DAngle ViewPitch;
 	DAngle ViewRoll;
 	double FracTic; // 0..1 value that describes where we are inside the current gametic, render-wise.
+	// this makes sense in RenderCamera
+	AActor* Camera;
+	// this is for RenderBeforeThing and RenderAfterThing
+	AActor* CurrentThing;
 
 	void RenderFrame() override;
 	void RenderCamera() override;
+	void RenderBeforeThing(AActor* thing) override;
+	void RenderAfterThing(AActor* thing) override;
+
+	// this is a class that I use to automatically call RenderAfterThing.
+	// C++ is really horrible for not providing try-finally statement.
+	struct AutoThing
+	{
+		AActor* thing;
+		
+		AutoThing(AActor* thing)
+		{
+			this->thing = thing;
+			E_RenderBeforeThing(this->thing);
+		}
+
+		~AutoThing()
+		{
+			E_RenderAfterThing(this->thing);
+		}
+	};
 
 private:
 	void Setup();
 };
 
-// register
-void E_RegisterHandler(DEventHandler* handler);
-// unregister
-void E_UnregisterHandler(DEventHandler* handler);
-
-// called right after the map has loaded (approximately same time as OPEN ACS scripts)
-void E_MapLoaded();
-// called when the map is about to unload (approximately same time as UNLOADING ACS scripts)
-void E_MapUnloading();
-// called on each render frame once.
-void E_RenderFrame();
-// called before entering each actor's view (including RenderFrame)
-void E_RenderCamera();
-
 #endif

src/gl/scene/gl_sprite.cpp

@@ -37,6 +37,7 @@
 #include "a_pickups.h"
 #include "d_player.h"
 #include "g_levellocals.h"
+#include "events.h"
 
 #include "gl/system/gl_interface.h"
 #include "gl/system/gl_framebuffer.h"
@@ -649,6 +650,8 @@ void GLSprite::Process(AActor* thing, sector_t * sector, int thruportal)
 	if (thing == nullptr)
 		return;
 
+	DRenderEventHandler::AutoThing autoRenderThingEvent(thing);
+
 	// [ZZ] allow CustomSprite-style direct picnum specification
 	bool isPicnumOverride = thing->picnum.isValid();
 

src/r_things.cpp

@@ -66,6 +66,7 @@
 #include "p_maputl.h"
 #include "g_levellocals.h"
 #include "r_thread.h"
+#include "events.h"
 
 EXTERN_CVAR(Bool, st_scale)
 EXTERN_CVAR(Bool, r_shadercolormaps)
@@ -1244,6 +1245,8 @@ void R_AddSprites (sector_t *sec, int lightlevel, int fakeside)
 		if (thing->validcount == validcount) continue;
 		thing->validcount = validcount;
 		
+		DRenderEventHandler::AutoThing autoRenderThingEvent(thing);
+
 		FIntCVar *cvar = thing->GetClass()->distancecheck;
 		if (cvar != NULL && *cvar >= 0)
 		{

wadsrc/static/zscript/events.txt

@@ -12,13 +12,20 @@ class EventHandler : Object native
 
 	virtual native void RenderFrame();
 	virtual native void RenderCamera();
+	virtual native void RenderBeforeThing();
+	virtual native void RenderAfterThing();
 }
 
 class RenderEventHandler : EventHandler native
 {
+	// for frame and camera
 	native readonly Vector3 ViewPos;
 	native readonly double ViewAngle;
 	native readonly double ViewPitch;
 	native readonly double ViewRoll;
 	native readonly double FracTic;
+	// for camera
+	native readonly Actor Camera;
+	// for thing
+	native readonly Actor CurrentThing;
 }