Initial megacommit.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoOGL/Src/Fifo.cpp

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+// Copyright (C) 2003-2008 Dolphin Project.
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 2.0.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License 2.0 for more details.
+
+// A copy of the GPL 2.0 should have been included with the program.
+// If not, see http://www.gnu.org/licenses/
+
+// Official SVN repository and contact information can be found at
+// http://code.google.com/p/dolphin-emu/
+
+#include <string.h>
+
+#include "Common.h"
+#include "Globals.h"
+#include "MemoryUtil.h"
+#include "Fifo.h"
+#include "Thread.h"
+#include "OpcodeDecoding.h"
+
+#define FIFO_SIZE (1024*1024)
+
+FifoReader fifo;
+static u8 *videoBuffer;
+
+int size = 0;
+int readptr = 0;
+
+void Fifo_Init()
+{
+    videoBuffer = (u8*)AllocateMemoryPages(FIFO_SIZE);
+    fifo.Init(videoBuffer, videoBuffer); //zero length. there is no data yet.
+}
+
+void Fifo_Shutdown()
+{
+    FreeMemoryPages(videoBuffer, FIFO_SIZE);
+}
+
+int FAKE_GetFifoSize()
+{
+    if (size < readptr)
+    {
+        PanicAlert("GFX Fifo underrun encountered.");
+    }
+    return (size - readptr);
+}
+
+u8 FAKE_PeekFifo8(u32 _uOffset)
+{
+    return videoBuffer[readptr + _uOffset];
+}
+
+u16 FAKE_PeekFifo16(u32 _uOffset)
+{
+    return Common::swap16(*(u16*)&videoBuffer[readptr + _uOffset]);
+}
+
+u32 FAKE_PeekFifo32(u32 _uOffset)
+{
+    return Common::swap32(*(u32*)&videoBuffer[readptr + _uOffset]);
+}
+
+u8 FAKE_ReadFifo8()
+{
+    return videoBuffer[readptr++];
+}
+
+u16 FAKE_ReadFifo16()
+{
+    u16 val = Common::swap16(*(u16*)(videoBuffer+readptr));
+    readptr += 2;
+    return val;
+}
+
+u32 FAKE_ReadFifo32()
+{
+    u32 val = Common::swap32(*(u32*)(videoBuffer+readptr));
+    readptr += 4;
+    return val;
+}
+
+void FAKE_SkipFifo(u32 skip)
+{
+    readptr += skip;
+}
+
+void Video_SendFifoData(BYTE *_uData)
+{
+    memcpy(videoBuffer + size, _uData, 32);
+    size += 32;
+    if (size + 32 >= FIFO_SIZE)
+    {
+        if (FAKE_GetFifoSize() > readptr)
+        {
+            SysMessage("out of bounds");
+            exit(1);
+        }
+
+        DebugLog("FAKE BUFFER LOOPS");
+        memmove(&videoBuffer[0], &videoBuffer[readptr], FAKE_GetFifoSize());
+        //		memset(&videoBuffer[FAKE_GetFifoSize()], 0, FIFO_SIZE - FAKE_GetFifoSize());
+        size = FAKE_GetFifoSize();
+        readptr = 0;
+    }
+    OpcodeDecoder_Run();
+}
+
+
+//TODO - turn inside out, have the "reader" ask for bytes instead
+// See Core.cpp for threading idea
+void Video_EnterLoop()
+{
+    SCPFifoStruct &fifo = *g_VideoInitialize.pCPFifo;
+
+    // TODO(ector): Don't peek so often!
+    while (g_VideoInitialize.pPeekMessages())
+    {
+        if (fifo.CPReadWriteDistance < 1) //fifo.CPLoWatermark)
+            Common::SleepCurrentThread(1);
+        //etc...
+
+        // check if we are able to run this buffer
+        if ((fifo.bFF_GPReadEnable) && !(fifo.bFF_BPEnable && fifo.bFF_Breakpoint))
+        {
+            int count = 200;
+            while(fifo.CPReadWriteDistance > 0 && count)
+            {
+                // check if we are on a breakpoint
+                if (fifo.bFF_BPEnable)
+                {
+                    if (fifo.CPReadPointer == fifo.CPBreakpoint)
+                    {
+                        fifo.bFF_Breakpoint = 1; 
+                        g_VideoInitialize.pUpdateInterrupts(); 
+                        break;
+                    }
+                }
+
+                // read the data and send it to the VideoPlugin
+
+                u8 *uData = Memory_GetPtr(fifo.CPReadPointer);
+#ifdef _WIN32
+                EnterCriticalSection(&fifo.sync);
+#endif
+                fifo.CPReadPointer += 32;
+                Video_SendFifoData(uData);
+#ifdef _WIN32
+                InterlockedExchangeAdd((LONG*)&fifo.CPReadWriteDistance, -32);
+                LeaveCriticalSection(&fifo.sync);
+#endif
+                // increase the ReadPtr
+                if (fifo.CPReadPointer >= fifo.CPEnd)
+                {
+                    fifo.CPReadPointer = fifo.CPBase;				
+                    //LOG(COMMANDPROCESSOR, "BUFFER LOOP");
+                }
+                count--;
+            }
+        }
+
+    }
+}
+