From 8e50ec7a85adbcb9b9256cc2c8357a9f13a442aa Mon Sep 17 00:00:00 2001
From: ColdSpirit <coldspiritvolf@gmail.com>
Date: Thu, 30 Dec 2021 14:44:01 +0400
Subject: [PATCH] Cvar onChange for qc menu

Use m_cvar_changed in qc menu to receive all cvar updates
---
 cvar.c             | 27 +++++++++++++++++++++++++++
 dpdefs/menudefs.qc |  1 +
 prvm_offsets.h     |  2 ++
 3 files changed, 30 insertions(+)

diff --git a/cvar.c b/cvar.c
index 7936c923..6abf324c 100644
--- a/cvar.c
+++ b/cvar.c
@@ -22,6 +22,10 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 #include "quakedef.h"
 
+#ifdef CONFIG_MENU
+    #include "progsvm.h"
+#endif
+
 const char *cvar_dummy_description = "custom cvar";
 static const char *cvar_null_string = "";
 
@@ -393,6 +397,21 @@ static void Cvar_SetQuick_Internal (cvar_t *var, const char *value)
 	// LadyHavoc: don't reallocate when there is no change
 	if (!changed)
 		return;
+    
+    //Con_Printf("----> Changing \"%s\" value from \"%s\" to \"%s\"\n", var->name, var->string, value);
+
+#ifdef CONFIG_MENU
+    // prepare values to send into QC
+	prvm_prog_t *prog = MVM_prog;
+    bool qcSubscribed = PRVM_menufunction(m_cvar_changed);
+
+    if (qcSubscribed && prog->loaded)
+    {
+        prog->globals.ip[OFS_PARM0] = PRVM_SetTempString(prog, var->name);
+        prog->globals.ip[OFS_PARM1] = PRVM_SetTempString(prog, var->string);
+        prog->globals.ip[OFS_PARM2] = PRVM_SetTempString(prog, value);
+    }
+#endif
 
 	// LadyHavoc: don't reallocate when the buffer is the same size
 	valuelen = strlen(value);
@@ -427,6 +446,14 @@ static void Cvar_SetQuick_Internal (cvar_t *var, const char *value)
 
 	// Call the function stored in the cvar for bounds checking, cleanup, etc
 	Cvar_Callback(var);
+
+#ifdef CONFIG_MENU
+    // call "onCvarChanged" like event
+    if (qcSubscribed && prog->loaded)
+    {
+        prog->ExecuteProgram(prog, PRVM_menufunction(m_cvar_changed), "QC function m_cvar_changed is missing");
+    }
+#endif
 }
 
 void Cvar_SetQuick (cvar_t *var, const char *value)
diff --git a/dpdefs/menudefs.qc b/dpdefs/menudefs.qc
index 63d2c638..5aa7f3f7 100644
--- a/dpdefs/menudefs.qc
+++ b/dpdefs/menudefs.qc
@@ -15,6 +15,7 @@ void		end_sys_fields;
 
 void() m_init;
 void(float keynr, float ascii) m_keydown;
+void(string cvarName, string oldValue, string newValue) m_cvar_changed;
 void(float width, float height) m_draw;
 void(float mode) m_toggle;
 void() m_shutdown;
diff --git a/prvm_offsets.h b/prvm_offsets.h
index 97a2defb..dd4caa1e 100644
--- a/prvm_offsets.h
+++ b/prvm_offsets.h
@@ -446,6 +446,7 @@ PRVM_DECLARE_function(m_newmap)
 PRVM_DECLARE_function(m_gethostcachecategory)
 PRVM_DECLARE_function(m_shutdown)
 PRVM_DECLARE_function(m_toggle)
+PRVM_DECLARE_function(m_cvar_changed)
 PRVM_DECLARE_function(main)
 PRVM_DECLARE_global(SV_InitCmd)
 PRVM_DECLARE_global(clientcommandframe)
@@ -594,6 +595,7 @@ PRVM_DECLARE_menufunction(m_keyup)
 PRVM_DECLARE_menufunction(m_newmap)
 PRVM_DECLARE_menufunction(m_shutdown)
 PRVM_DECLARE_menufunction(m_toggle)
+PRVM_DECLARE_menufunction(m_cvar_changed)
 PRVM_DECLARE_menuglobaledict(self)
 PRVM_DECLARE_menuglobalfloat(drawfont)
 PRVM_DECLARE_menuglobalfloat(require_spawnfunc_prefix)
-- 
2.39.2