1 files changed, 42 insertions, 1 deletions
diff --git a/Source/Core/VideoCommon/Src/BPStructs.cpp b/Source/Core/VideoCommon/Src/BPStructs.cpp
index 827e182f77..d36110494f 100644
--- a/Source/Core/VideoCommon/Src/BPStructs.cpp
+++ b/Source/Core/VideoCommon/Src/BPStructs.cpp
@@ -34,10 +34,18 @@
 
 using namespace BPFunctions;
 
+u32 mapTexAddress;
+bool mapTexFound;
+int numWrites;
+
 void BPInit()
 {
 	memset(&bpmem, 0, sizeof(bpmem));
 	bpmem.bpMask = 0xFFFFFF;
+
+   mapTexAddress = 0;
+   numWrites = 0;
+   mapTexFound = false;
 }
 
 void RenderToXFB(const BPCmd &bp, const EFBRectangle &rc, float yScale, float xfbLines, u32 xfbAddr, const u32 dstWidth, const u32 dstHeight)
@@ -83,7 +91,40 @@ void BPWritten(const BPCmd& bp)
 	// FIXME: Hangs load-state, but should fix graphic-heavy games state loading
 	//s_bpCritical.Enter();
 
-	FlushPipeline();
+   //BEGIN ZTP SPEEDUP HACK CHANGES
+   //This hunk of code disables the usual pipeline flush for certain BP Writes
+   //that occur while the minimap is being drawn in Zelda: twilight princess.
+   //This significantly increases speed while in hyrule field. In depth discussion
+   //on how this Hack came to be can be found at:http://forums.dolphin-emu.com/thread-10638.html
+   //-fircrestsk8
+   if (g_ActiveConfig.bZTPSpeedHack)
+   {
+      if (!mapTexFound)
+      {
+         if (bp.address == BPMEM_TEV_COLOR_ENV || bp.address == BPMEM_TEV_ALPHA_ENV)
+         {
+            numWrites++;
+            if (numWrites >= 100) //seem that if 100 consecutive BP writes are called to either of these addresses in ZTP, 
+            {                      //then it is safe to assume the map texture address is currently loaded into the BP memory
+               mapTexAddress = (bpmem.tex[0].texImage3[0].hex << 5);
+               mapTexFound = true;
+               WARN_LOG(VIDEO, "\nZTP map texture found at address %08x\n", mapTexAddress);
+            }
+         }
+         else
+            numWrites = 0;
+         FlushPipeline();
+      }
+      else
+      {
+         if ( ((bpmem.tex[0].texImage3[0].hex << 5) != mapTexAddress) || !(bpmem.tevorders[0].getEnable(0))  || bp.address == BPMEM_TREF )
+	         FlushPipeline();
+      }
+   }
+   else
+      FlushPipeline();
+   //END ZTP SPEEDUP HACK CHANGES
+
 	((u32*)&bpmem)[bp.address] = bp.newvalue;
 	
 	switch (bp.address)