From 7329bcef6be57b08b52f5fb6f7a6e6cf2b74d64b Mon Sep 17 00:00:00 2001
From: jeffman <jefferbrecht@gmail.com>
Date: Fri, 17 Mar 2017 00:56:41 -0400
Subject: [PATCH] Only re-render PSI help on button press

Without this, the game will constantly try to clear+render the whole PSI
help window per frame which causes extreme lag and tearing.
---
 m2-hack.asm        |  3 +++
 m2-vwf-entries.asm | 29 +++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)

diff --git a/m2-hack.asm b/m2-hack.asm
index 2c0debe..67658b8 100644
--- a/m2-hack.asm
+++ b/m2-hack.asm
@@ -48,6 +48,9 @@ incsrc m2-status-switch.asm
 org $80BACFC; bl m2_vwf_entries.bac18_redraw_status
 org $80BADE6; bl m2_vwf_entries.bac18_redraw_status
 org $80BACEE; bl m2_vwf_entries.bac18_clear_psi
+org     $80BADC8
+bl      m2_vwf_entries.bac18_check_button
+b       $80BADD8
 
 //---------------------------------------------------------
 // C1FBC hacks (PSI window)
diff --git a/m2-vwf-entries.asm b/m2-vwf-entries.asm
index bda098c..e4adb48 100644
--- a/m2-vwf-entries.asm
+++ b/m2-vwf-entries.asm
@@ -359,3 +359,32 @@ pop     {r0}
 lsl     r0,r0,#0x10
 asr     r4,r0,#0x10
 pop     {pc}
+
+//==============================================================================
+// Only clear+redraw the PSI help if a button has been pressed
+.bac18_check_button:
+push    {lr}
+
+// Copy the thing that was on the stack from the caller
+add     sp,#-4
+ldr     r0,[sp,#8]
+str     r0,[sp,#0]
+
+ldr     r0,=#0x3002500
+ldrh    r0,[r0,#0]
+cmp     r0,#0
+beq     +
+
+// Clear window
+ldr     r0,[r5,#0x28]
+mov     r1,r2
+mov     r2,#0
+bl      $80BE458
+
+// Render window
+ldr     r0,[r5,#0x28]
+bl      $80C8BE4
+
++
+add     sp,#4
+pop     {pc}