From f926a62f27a3a513b8a4594728a8d6ace65920a3 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Sun, 19 Nov 2023 23:45:55 +0200
Subject: [PATCH] spu: adjust dma timing + a hack

libretro/pcsx_rearmed#799
---
 libpcsxcore/psxdma.c  |  4 ++--
 plugins/dfsound/dma.c | 27 ++++++++++++++++++++++-----
 2 files changed, 24 insertions(+), 7 deletions(-)

diff --git a/libpcsxcore/psxdma.c b/libpcsxcore/psxdma.c
index fa8f3394..e3655b5e 100644
--- a/libpcsxcore/psxdma.c
+++ b/libpcsxcore/psxdma.c
@@ -67,7 +67,7 @@ void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
 			// This should be much slower, like 12+ cycles/byte, it's like
 			// that because the CPU runs too fast and fifo is not emulated.
 			// See also set_dma_end().
-			set_event(PSXINT_SPUDMA, words * 4);
+			set_event(PSXINT_SPUDMA, words * 4 * 4);
 			return;
 
 		case 0x01000200: //spu to cpu transfer
@@ -78,7 +78,7 @@ void psxDma4(u32 madr, u32 bcr, u32 chcr) { // SPU
 			psxCpu->Clear(madr, words_copy);
 
 			HW_DMA4_MADR = SWAPu32(madr + words_copy * 4);
-			set_event(PSXINT_SPUDMA, words * 4);
+			set_event(PSXINT_SPUDMA, words * 4 * 4);
 			return;
 
 		default:
diff --git a/plugins/dfsound/dma.c b/plugins/dfsound/dma.c
index 25a0aefd..fde1f835 100644
--- a/plugins/dfsound/dma.c
+++ b/plugins/dfsound/dma.c
@@ -51,7 +51,7 @@ void CALLBACK SPUreadDMAMem(unsigned short *pusPSXMem, int iSize,
   addr &= 0x7fffe;
  }
  if ((spu.spuCtrl & CTRL_IRQ) && irq_after < iSize * 2) {
-  log_unhandled("rdma spu irq: %x/%x+%x\n", irq_addr, spu.spuAddr, iSize * 2);
+  log_unhandled("rdma spu irq: %x/%x-%x\n", irq_addr, spu.spuAddr, addr);
   do_irq_io(irq_after);
  }
  spu.spuAddr = addr;
@@ -68,7 +68,7 @@ void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,
  unsigned int addr = spu.spuAddr, irq_addr = regAreaGet(H_SPUirqAddr) << 3;
  int i, irq_after;
  
- do_samples_if_needed(cycles, 1, 2);
+ do_samples_if_needed(cycles + iSize*2 * 4, 1, 2);
  irq_after = (irq_addr - addr) & 0x7ffff;
  spu.bMemDirty = 1;
 
@@ -87,11 +87,28 @@ void CALLBACK SPUwriteDMAMem(unsigned short *pusPSXMem, int iSize,
   }
  }
  if ((spu.spuCtrl & CTRL_IRQ) && irq_after < iSize * 2) {
-  log_unhandled("wdma spu irq: %x/%x+%x (%u)\n",
-    irq_addr, spu.spuAddr, iSize * 2, irq_after);
+  log_unhandled("%u wdma spu irq: %x/%x-%x (%u)\n",
+    cycles, irq_addr, spu.spuAddr, addr, irq_after);
   // this should be consistent with psxdma.c timing
   // might also need more delay like in set_dma_end()
-  do_irq_io(irq_after);
+  do_irq_io(irq_after * 4);
+ }
+ for (i = 0; i < 24; i++) {
+  size_t ediff, p = spu.s_chan[i].pCurr - spu.spuMemC;
+  if (spu.s_chan[i].ADSRX.State == ADSR_RELEASE && !spu.s_chan[i].ADSRX.EnvelopeVol)
+   continue;
+  ediff = addr - p;
+  if (spu.spuAddr < p && p < spu.spuAddr + iSize * 2) {
+   log_unhandled("%u spu ch%02d play %zx dma %x-%x (%zd)\n",
+     cycles, i, p, spu.spuAddr, addr, ediff);
+   //exit(1);
+  }
+  // a hack for the super annoying timing issues in The Emperor's New Groove
+  // (which is a game bug, but tends to trigger more here)
+  if (ediff <= 0x20u) {
+   spu.s_chan[i].pCurr += ediff;
+   break;
+  }
  }
  spu.spuAddr = addr;
  set_dma_end(iSize, cycles);
-- 
2.39.2