From b7d402aacf99e9678fc3d730cdb5820687533f4c Mon Sep 17 00:00:00 2001
From: zilmar <zilmar@pj64-emu.com>
Date: Wed, 14 Oct 2015 10:06:50 +1100
Subject: [PATCH] [Glide64] Subscreen delay fix for zelda OoT

https://github.com/mupen64plus/mupen64plus-video-glide64mk2/commit/f3b47bbe40c7050ab0963d8eb34fca61941b5ae5
---
 Source/Glide64/Main.cpp |  4 +++-
 Source/Glide64/rdp.cpp  | 26 +++++++++++++++++++++++++-
 Source/Glide64/rdp.h    |  1 +
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/Source/Glide64/Main.cpp b/Source/Glide64/Main.cpp
index 9289198cb..070f62320 100644
--- a/Source/Glide64/Main.cpp
+++ b/Source/Glide64/Main.cpp
@@ -411,7 +411,9 @@ void ReadSpecialSettings (const char * name)
   settings.hacks = 0;
 
   //detect games which require special hacks
-  if (strstr(name, (const char *)"ZELDA") || strstr(name, (const char *)"MASK"))
+  if (strstr(name, (const char *)"ZELDA"))
+    settings.hacks |= (hack_Zelda | hack_OoT);
+  else if(strstr(name, (const char *)"MASK"))
     settings.hacks |= hack_Zelda;
   else if (strstr(name, (const char *)"ROADSTERS TROPHY"))
     settings.hacks |= hack_Zelda;
diff --git a/Source/Glide64/rdp.cpp b/Source/Glide64/rdp.cpp
index 52213cf07..ed14f488f 100644
--- a/Source/Glide64/rdp.cpp
+++ b/Source/Glide64/rdp.cpp
@@ -470,6 +470,26 @@ static void DrawPartFrameBufferToScreen()
   ((wxUint32)((float)((color&0x07C0) >> 6) / 31.0f * 255.0f) << 16) | \
   ((wxUint32)((float)((color&0x003E) >> 1) / 31.0f * 255.0f) << 8)
 
+static void copyWhiteToRDRAM()
+{
+    if(rdp.ci_width == 0)
+        return;
+
+    wxUint16 *ptr_dst = (wxUint16*)(gfx.RDRAM + rdp.cimg);
+    wxUint32 *ptr_dst32 = (wxUint32*)(gfx.RDRAM + rdp.cimg);
+
+    for(wxUint32 y = 0; y < rdp.ci_height; y++)
+    {
+        for(wxUint32 x = 0; x < rdp.ci_width; x++)
+        {
+            if(rdp.ci_size == 2)
+                ptr_dst[(x + y * rdp.ci_width) ^ 1] = 0xFFFF;
+            else
+                ptr_dst32[x + y * rdp.ci_width] = 0xFFFFFFFF;
+        }
+    }
+}
+
 static void CopyFrameBuffer (GrBuffer_t buffer = GR_BUFFER_BACKBUFFER)
 {
   if (!fullscreen)
@@ -892,8 +912,12 @@ EXPORT void CALL ProcessDList(void)
     rdp.scale_x = rdp.scale_x_bak;
     rdp.scale_y = rdp.scale_y_bak;
   }
-  if (settings.frame_buffer & fb_ref)
+
+  if(settings.hacks & hack_OoT)
+    copyWhiteToRDRAM(); //Subscreen delay fix
+  else if (settings.frame_buffer & fb_ref)
     CopyFrameBuffer ();
+
   if (rdp.cur_image)
     CloseTextureBuffer(rdp.read_whole_frame && ((settings.hacks&hack_PMario) || rdp.swap_ci_index >= 0));
 
diff --git a/Source/Glide64/rdp.h b/Source/Glide64/rdp.h
index fff889af6..b5aae5164 100644
--- a/Source/Glide64/rdp.h
+++ b/Source/Glide64/rdp.h
@@ -330,6 +330,7 @@ typedef struct {
   #define  hack_Tonic       (1<<26)  //tonic trouble
   #define  hack_Yoshi       (1<<27)  //Yoshi Story
   #define  hack_Zelda       (1<<28)  //zeldas hacks
+  #define  hack_OoT         (1<<29)  //zelda OoT hacks
   wxUint32 hacks;
 
   //wrapper settings