From 103dec9ab9807420f5d5daf5d8515e5c9837d25b Mon Sep 17 00:00:00 2001
From: sezero <sezero@users.sourceforge.net>
Date: Mon, 20 Aug 2018 14:00:02 +0300
Subject: [PATCH] glide2x,sst96: merged dborca commit 2506470 (Rush: fixed
 grLfbLock(AUXBUFFER))

---
 glide2x/sst1/init/init96/dxdrvr.c | 12 ++++++++++++
 glide2x/sst1/init/init96/init96.c |  9 +++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/glide2x/sst1/init/init96/dxdrvr.c b/glide2x/sst1/init/init96/dxdrvr.c
index fbb1409..7e2178c 100644
--- a/glide2x/sst1/init/init96/dxdrvr.c
+++ b/glide2x/sst1/init/init96/dxdrvr.c
@@ -16,6 +16,9 @@
 ** THE UNITED STATES.  
 ** 
 ** COPYRIGHT 3DFX INTERACTIVE, INC. 1999, ALL RIGHTS RESERVED
+**
+** 35    11/03/98 11:13a Peter
+** release exclusive mode in the fullscreen case of restoreVideo
  * 
  * 34    1/12/98 10:22p Dow
  * H3D Stereo Support
@@ -732,6 +735,15 @@ dxClose(void)
  *  to only create lpDD1 once per application execution. /PGJ
  */
 #if 1
+  /* If we're fullscreen then we need to release exclusive mode access
+   * to the hw otherwise re-opens won't work. DD seems to take care of
+   * this if the app just quits, but nuking the surfaces does not seem
+   * to be sufficient in the normal case.  
+   */
+  if (IsFullScreen) {
+    IDirectDraw2_SetCooperativeLevel(lpDD, hWndApp, DDSCL_NORMAL );
+  }
+
   // Release any allocated buffers
   if( lpClipper) IDirectDrawSurface2_Release( lpClipper);
   if( lpFront  ) IDirectDrawSurface2_Release( lpFront  );
diff --git a/glide2x/sst1/init/init96/init96.c b/glide2x/sst1/init/init96/init96.c
index 35ea013..bd0f5a4 100644
--- a/glide2x/sst1/init/init96/init96.c
+++ b/glide2x/sst1/init/init96/init96.c
@@ -1638,7 +1638,7 @@ INITVG96ENTRY(init96Idle, void , (Init96WriteMethod *wcb) )
   Return:
   void opinter to buffer
   -------------------------------------------------------------------*/
-#define LFB_OFFSET( X ) ( X & 0x3fffff )
+#define LFB_OFFSET( X ) ( X & 0x3fffff ) /* was 0x1fffff */
 
 INITVG96ENTRY(init96GetBufferPtr, void*, (InitBuffer_t buffer, int *strideBytes)) 
 {
@@ -1665,7 +1665,12 @@ INITVG96ENTRY(init96GetBufferPtr, void*, (InitBuffer_t buffer, int *strideBytes)
     break;
 
   case INIT_BUFFER_AUXBUFFER:
-    rv = (void*)(((char*)sstHW) + LFB_OFFSET(ab0));
+    rv = (void*)(((char*)sstHW) + LFB_OFFSET(ab0Base));
+    /* [dBorca]
+     * used to be ab0, but I changed it to ab0Base.
+     * VG96STRIDE(ab0Stride) doesn't really matter,
+     * because we stripped off the high bits anyway!
+     */
     *strideBytes = ab0Stride;
     GDBG_INFO((80, "  get aux buffer pointer" ));
     break;