cdrom: partially emulate the fifo

diff --git a/libpcsxcore/cdrom.c b/libpcsxcore/cdrom.c
index bd013e3..ebbad97 100644 (file)
--- a/libpcsxcore/cdrom.c
+++ b/libpcsxcore/cdrom.c
@@ -76,7 +76,7 @@ static struct {
        unsigned char ResultP;
        unsigned char ResultReady;
        unsigned char Cmd;
-       unsigned char Readed;
+       unsigned char unused4;
        unsigned char SetlocPending;
        u32 Reading;
 
@@ -95,7 +95,8 @@ static struct {
 
        xa_decode_t Xa;
 
-       u32 FifoOffset;
+       u16 FifoOffset;
+       u16 FifoSize;
 
        u16 CmdInProgress;
        u8 Irq1Pending;
@@ -1176,7 +1177,8 @@ static void cdrUpdateTransferBuf(const u8 *buf)
        memcpy(cdr.Transfer, buf, DATA_SIZE);
        CheckPPFCache(cdr.Transfer, cdr.Prev[0], cdr.Prev[1], cdr.Prev[2]);
        CDR_LOG("cdr.Transfer %x:%x:%x\n", cdr.Transfer[0], cdr.Transfer[1], cdr.Transfer[2]);
-       cdr.Readed = 0;
+       if (cdr.FifoOffset < 2048 + 12)
+               CDR_LOG("cdrom: FifoOffset(1) %d/%d\n", cdr.FifoOffset, cdr.FifoSize);
 }
 
 static void cdrReadInterrupt(void)
@@ -1366,10 +1368,10 @@ void cdrWrite1(unsigned char rt) {
 unsigned char cdrRead2(void) {
        unsigned char ret = 0;
 
-       if (cdr.Readed && cdr.FifoOffset < DATA_SIZE)
+       if (cdr.FifoOffset < cdr.FifoSize)
                ret = cdr.Transfer[cdr.FifoOffset++];
        else
-               CDR_LOG_I("cdrom: read empty fifo\n");
+               CDR_LOG_I("cdrom: read empty fifo (%d)\n", cdr.FifoSize);
 
        CDR_LOG_IO("cdr r2.dat: %02x\n", ret);
        return ret;
@@ -1438,21 +1440,27 @@ void cdrWrite3(unsigned char rt) {
                return;
        }
 
-       if ((rt & 0x80) && cdr.Readed == 0) {
-               cdr.Readed = 1;
-
+       // test: Viewpoint
+       if ((rt & 0x80) && cdr.FifoOffset < cdr.FifoSize) {
+               CDR_LOG("cdrom: FifoOffset(2) %d/%d\n", cdr.FifoOffset, cdr.FifoSize);
+       }
+       else if (rt & 0x80) {
                switch (cdr.Mode & 0x30) {
                        case MODE_SIZE_2328:
                        case 0x00:
                                cdr.FifoOffset = 12;
+                               cdr.FifoSize = 2048 + 12;
                                break;
 
                        case MODE_SIZE_2340:
                        default:
                                cdr.FifoOffset = 0;
+                               cdr.FifoSize = 2340;
                                break;
                }
        }
+       else if (!(rt & 0xc0))
+               cdr.FifoOffset = DATA_SIZE; // fifo empty
 }
 
 void psxDma3(u32 madr, u32 bcr, u32 chcr) {
@@ -1464,10 +1472,6 @@ void psxDma3(u32 madr, u32 bcr, u32 chcr) {
 
        switch (chcr & 0x71000000) {
                case 0x11000000:
-                       if (cdr.Readed == 0) {
-                               CDR_LOG_I("psxDma3() Log: *** DMA 3 *** NOT READY\n");
-                               break;
-                       }
                        ptr = (u8 *)PSXM(madr);
                        if (ptr == INVALID_PTR) {
                                CDR_LOG_I("psxDma3() Log: *** DMA 3 *** NULL Pointer!\n");
@@ -1575,6 +1579,7 @@ int cdrFreeze(void *f, int Mode) {
                getCdInfo();
 
                cdr.FifoOffset = tmp;
+               cdr.FifoSize = (cdr.Mode & 0x20) ? 2340 : 2048 + 12;
 
                // read right sub data
                tmpp[0] = btoi(cdr.Prev[0]);