From 12e4d82471e864137741b76b12dd06a028b87bf1 Mon Sep 17 00:00:00 2001
From: Bart Trzynadlowski <bart.trzy@gmail.com>
Date: Wed, 10 Aug 2011 05:35:42 +0000
Subject: [PATCH] - DSB2 save state support. - krom made a minor optimization
 of the byte reverse routines in ppc.cpp.

---
 Src/CPU/PowerPC/ppc.cpp |  4 +--
 Src/Model3/DSB.cpp      | 79 ++++++++++++++++++++++++++++++++++++++++-
 Src/Model3/DSB.h        | 10 ++++--
 3 files changed, 88 insertions(+), 5 deletions(-)

diff --git a/Src/CPU/PowerPC/ppc.cpp b/Src/CPU/PowerPC/ppc.cpp
index d5501dd..ed8fdf5 100644
--- a/Src/CPU/PowerPC/ppc.cpp
+++ b/Src/CPU/PowerPC/ppc.cpp
@@ -155,8 +155,8 @@ static UINT32		ppc_field_xlat[256];
 #define TSR_ENW			0x80000000
 #define TSR_WIS			0x40000000
 
-#define BYTE_REVERSE16(x)	((((x) >> 8) & 0xff) | (((x) << 8) & 0xff00))
-#define BYTE_REVERSE32(x)	((((x) >> 24) & 0xff) | (((x) >> 8) & 0xff00) | (((x) << 8) & 0xff0000) | (((x) << 24) & 0xff000000))
+#define BYTE_REVERSE16(x)	(((x >> 8) | (x << 8)) & 0xFFFF)
+#define BYTE_REVERSE32(x)	((x >> 24) | ((x << 8) & 0x00FF0000) | ((x >> 8) & 0x0000FF00) | (x << 24))
 
 typedef union {
 	UINT64	id;
diff --git a/Src/Model3/DSB.cpp b/Src/Model3/DSB.cpp
index 78f001b..6202007 100644
--- a/Src/Model3/DSB.cpp
+++ b/Src/Model3/DSB.cpp
@@ -669,6 +669,10 @@ void CDSB2::WriteMPEGFIFO(UINT8 byte)
 
 			else if (byte == 0x74 || byte == 0x75)	// "start play"
 			{
+				usingLoopStart = 0;
+				usingLoopEnd = 0;
+				usingMPEGStart = mpegStart;
+				usingMPEGEnd = mpegEnd;
 				MPEG_PlayMemory((const char *) &mpegROM[mpegStart], mpegEnd-mpegStart);
 				printf("playing %X\n", mpegStart);
 				mpegState = ST_IDLE;
@@ -715,7 +719,9 @@ void CDSB2::WriteMPEGFIFO(UINT8 byte)
 			if (playing)
 			{
 				printf("Setting loop point to %x\n", mpegStart);
-				MPEG_SetLoop((const char *) &mpegROM[mpegStart], mpegEnd-mpegStart);
+				usingLoopStart = mpegStart;
+				usingLoopEnd = mpegEnd-mpegStart;
+				MPEG_SetLoop((const char *) &mpegROM[usingLoopStart], usingLoopEnd);
 			}
 
 			printf("mpegStart=%x\n", mpegStart);
@@ -751,6 +757,10 @@ void CDSB2::WriteMPEGFIFO(UINT8 byte)
 			mpegState = ST_IDLE;
 			if (byte == 0x75)
 			{
+				usingLoopStart = 0;
+				usingLoopEnd = 0;
+				usingMPEGStart = mpegStart;
+				usingMPEGEnd = mpegEnd;
 				MPEG_PlayMemory((const char *) &mpegROM[mpegStart], mpegEnd-mpegStart);
 				printf("playing %X (from st_gota4)\n", mpegStart);
 				playing = 1;
@@ -991,10 +1001,77 @@ void CDSB2::Reset(void)
 
 void CDSB2::SaveState(CBlockFile *StateFile)
 {
+	UINT32	mpegPos;
+	UINT8	isPlaying;
+	
+	StateFile->NewBlock("DSB2", __FILE__);
+	
+	// MPEG playback state
+	isPlaying = (UINT8) MPEG_IsPlaying();
+	mpegPos = MPEG_GetProgress();
+	StateFile->Write(&isPlaying, sizeof(isPlaying));
+	StateFile->Write(&mpegPos, sizeof(mpegPos));
+	StateFile->Write(&usingMPEGStart, sizeof(usingMPEGStart));
+	StateFile->Write(&usingMPEGEnd, sizeof(usingMPEGEnd));
+	StateFile->Write(&usingLoopStart, sizeof(usingLoopStart));
+	StateFile->Write(&usingLoopEnd, sizeof(usingLoopEnd));
+	
+	// MPEG board state
+	StateFile->Write(ram, 0x20000);
+	StateFile->Write(fifo, sizeof(fifo));
+	StateFile->Write(&fifoIdxR, sizeof(fifoIdxR));
+	StateFile->Write(&fifoIdxW, sizeof(fifoIdxW));
+	StateFile->Write(&cmdLatch, sizeof(cmdLatch));
+	StateFile->Write(&mpegState, sizeof(mpegState));
+	StateFile->Write(&mpegStart, sizeof(mpegStart));
+	StateFile->Write(&mpegEnd, sizeof(mpegEnd));
+	StateFile->Write(&playing, sizeof(playing));
+	StateFile->Write(volume, sizeof(volume));
+	
+	// 68K CPU state
+	M68KSaveState(StateFile, "DSB2 68K");
 }
 
 void CDSB2::LoadState(CBlockFile *StateFile)
 {
+	UINT32	mpegPos;
+	UINT8	isPlaying;
+	
+	if (OKAY != StateFile->FindBlock("DSB2"))
+	{
+		ErrorLog("Unable to load Digital Sound Board state. Save state file is corrupted.");
+		return;
+	}
+	
+	StateFile->Read(&isPlaying, sizeof(isPlaying));
+	StateFile->Read(&mpegPos, sizeof(mpegPos));
+	StateFile->Read(&usingMPEGStart, sizeof(usingMPEGStart));
+	StateFile->Read(&usingMPEGEnd, sizeof(usingMPEGEnd));
+	StateFile->Read(&usingLoopStart, sizeof(usingLoopStart));
+	StateFile->Read(&usingLoopEnd, sizeof(usingLoopEnd));
+	
+	StateFile->Read(ram, 0x20000);
+	StateFile->Read(fifo, sizeof(fifo));
+	StateFile->Read(&fifoIdxR, sizeof(fifoIdxR));
+	StateFile->Read(&fifoIdxW, sizeof(fifoIdxW));
+	StateFile->Read(&cmdLatch, sizeof(cmdLatch));
+	StateFile->Read(&mpegState, sizeof(mpegState));
+	StateFile->Read(&mpegStart, sizeof(mpegStart));
+	StateFile->Read(&mpegEnd, sizeof(mpegEnd));
+	StateFile->Read(&playing, sizeof(playing));
+	StateFile->Read(volume, sizeof(volume));
+	
+	M68KLoadState(StateFile, "DSB2 68K");
+	
+	// Restart MPEG audio at the appropriate position
+	if (isPlaying)
+	{
+		MPEG_PlayMemory((const char *) &mpegROM[usingMPEGStart], usingMPEGEnd-usingMPEGStart);
+		MPEG_SetLoop((const char *) &mpegROM[usingLoopStart], usingLoopEnd);
+		MPEG_SetOffset(mpegPos);
+	}
+	else
+		MPEG_StopPlaying();
 }
 
 // Offsets of memory regions within DSB2's pool
diff --git a/Src/Model3/DSB.h b/Src/Model3/DSB.h
index 3a992cd..86bf725 100644
--- a/Src/Model3/DSB.h
+++ b/Src/Model3/DSB.h
@@ -264,10 +264,10 @@ private:
 	INT16	*mpegL, *mpegR;
 	
 	// DSB memory
-	const UINT8	*progROM;		// Z80 program ROM (passed in from parent object)
+	const UINT8	*progROM;		// 68K program ROM (passed in from parent object)
 	const UINT8	*mpegROM;		// MPEG music ROM
 	UINT8		*memoryPool;	// all memory allocated here
-	UINT8		*ram;			// Z80 RAM
+	UINT8		*ram;			// 68K RAM
 
 	// Command FIFO
 	UINT8	fifo[128];
@@ -280,6 +280,12 @@ private:
 	int 	mpegStart, mpegEnd, playing;
 	UINT8	volume[2];		// left, right volume (0x00-0xFF)
 	
+	// Settings of currently playing stream (may not match the playback register variables above)
+	UINT32	usingLoopStart;	// what was last set by MPEG_SetLoop() or MPEG_PlayMemory()
+	UINT32	usingLoopEnd;
+	UINT32	usingMPEGStart;	// what was last set by MPEG_PlayMemory()
+	UINT32	usingMPEGEnd;
+	
 	// M68K CPU
 	M68KCtx	M68K;
 };