From cc2814c5cf378a2cea7894cf26fcd874bc5c3498 Mon Sep 17 00:00:00 2001
From: n-a-c-h <>
Date: Sat, 14 May 2005 18:23:16 +0000
Subject: [PATCH] Pause rewind now mostly implemented.

---
 zsnes/src/cpu/execute.asm | 33 +++++++++++++++++++++++++--------
 zsnes/src/zstate.c        | 22 +++++++++++++++++-----
 2 files changed, 42 insertions(+), 13 deletions(-)

diff --git a/zsnes/src/cpu/execute.asm b/zsnes/src/cpu/execute.asm
index fc013c6d..920c58bd 100644
--- a/zsnes/src/cpu/execute.asm
+++ b/zsnes/src/cpu/execute.asm
@@ -56,6 +56,7 @@ EXTSYM MovieSeekBehind,SaveSramData,BackupCVFrame,RestoreCVFrame,loadstate
 EXTSYM KeyInsrtChap,KeyNextChap,KeyPrevChap,MovieInsertChapter,MovieSeekAhead
 EXTSYM ResetDuringMovie,EMUPauseKey,INCRFrameKey,MovieWaiting,NoInputRead
 EXTSYM AllocatedRewindStates,SlowDownLock,FastForwardLock
+EXTSYM PauseFrameMode,RestorePauseFrame
 
 %ifdef __MSDOS__
 EXTSYM dssel
@@ -1425,24 +1426,40 @@ NEWSYM cpuover
 .noinputread
 
     ;Pause and Frame increment
+    cmp byte[PauseFrameMode],2
+    jne .nopauseframemode2
+    pushad
+    call RestorePauseFrame
+    popad
+.nopauseframemode2
+    
+    cmp byte[EMUPause],1
+    jne .noemupause
+
+    ; prevents some random desyncs
+    mov byte[SlowDownLock],0 
+    mov byte[FastForwardLock],0
+    
+    call ProcessRewind
+        
+    cmp byte[PauseFrameMode],1
+    jne .nopauseframemode1
+    mov byte[PauseFrameMode],2
+    jmp .noprocmovie
+.nopauseframemode1
+
     cmp byte[INCRFrame],1
     jne .noframeincr
     xor byte[INCRFrame],1
     jmp .noemupause
 .noframeincr
-    cmp byte[EMUPause],1
-    jne .noemupause
-    mov byte[SlowDownLock],0 ; prevents some random desyncs
-    mov byte[FastForwardLock],0 ; prevents some random desyncs
-
-    call ProcessRewind
 
     ;Update screen (we should also kill sound)
     pushad
+    call StartDrawNewGfx
     call showvideo
     popad
-
-    ;jmp .nocache
+    
     jmp .nonewgfx
 .noemupause
 
diff --git a/zsnes/src/zstate.c b/zsnes/src/zstate.c
index 4b0194ca..c7c9de6f 100755
--- a/zsnes/src/zstate.c
+++ b/zsnes/src/zstate.c
@@ -220,18 +220,28 @@ void ClearCacheCheck()
 }
 
 //Code to handle special frames for pausing, and desync checking
-unsigned char *SpecialPauseBackup = 0;
+unsigned char *SpecialPauseBackup = 0, PauseFrameMode = 0;
+/*
+Pause frame modes
+
+0 - no pause frame stored
+1 - pause frame stored
+2 - pause frame ready for reload
+*/
+
 void *doMemAlloc(size_t);
 
 void BackupPauseFrame()
 {
   copy_state_data(SpecialPauseBackup, memcpyinc, csm_save_rewind);
+  PauseFrameMode = 1;
 }
 
 void RestorePauseFrame()
 {
   copy_state_data(SpecialPauseBackup, memcpyrinc, csm_load_rewind);
   ClearCacheCheck();
+  PauseFrameMode = 0;
 }
 
 #define ActualRewindFrames (RewindFrames * (romispal ? 10 : 12))
@@ -285,14 +295,16 @@ void RestoreCVFrame()
       zmv_rewind_load(LatestRewindPos, true);
     }
 
-    if ((EMUPause = PauseRewind)) //Yes this if supposed to have a single equal
-    {
-      BackupPauseFrame();
-    }
+    EMUPause = PauseRewind;
   }
 
   copy_state_data(RewindBufferPos, memcpyrinc, csm_load_rewind);
 
+  if (EMUPause)
+  {
+    BackupPauseFrame();
+  }  
+  
   ClearCacheCheck();
   
   RewindTimer = ActualRewindFrames;