32x: improved lockstep mode, allows compatibility over 50%

[picodrive.git] / pico / 32x / 32x.c

diff --git a/pico/32x/32x.c b/pico/32x/32x.c
index a9a28a9..9a981f6 100644 (file)
--- a/pico/32x/32x.c
+++ b/pico/32x/32x.c
@@ -126,25 +126,39 @@ static __inline void SekRunM68k(int cyc)
 
 // ~1463.8, but due to cache misses and slow mem
 // it's much lower than that
-#define SH2_LINE_CYCLES 735
+//#define SH2_LINE_CYCLES 735
+#define CYCLES_M68K2SH2(x) ((x) * 6 / 4)
 
 #define PICO_32X
-#define RUN_SH2S_SIMPLE \
+#define CPUS_RUN_SIMPLE(m68k_cycles,s68k_cycles) \
+  SekRunM68k(m68k_cycles); \
   if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
-    sh2_execute(&msh2, SH2_LINE_CYCLES); \
+    sh2_execute(&msh2, CYCLES_M68K2SH2(m68k_cycles)); \
   if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) \
-    sh2_execute(&ssh2, SH2_LINE_CYCLES);
+    sh2_execute(&ssh2, CYCLES_M68K2SH2(m68k_cycles))
 
-#define RUN_SH2S_LOCKSTEP \
+#define STEP_68K 24
+#define CPUS_RUN_LOCKSTEP(m68k_cycles,s68k_cycles) \
 { \
   int i; \
-  for (i = 0; i < SH2_LINE_CYCLES; i+= 3) { \
-    sh2_execute(&msh2, 3); \
-    sh2_execute(&ssh2, 3); \
+  for (i = 0; i <= (m68k_cycles) - STEP_68K; i += STEP_68K) { \
+    SekRunM68k(STEP_68K); \
+    if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
+      sh2_execute(&msh2, CYCLES_M68K2SH2(STEP_68K)); \
+    if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) \
+      sh2_execute(&ssh2, CYCLES_M68K2SH2(STEP_68K)); \
   } \
+  /* last step */ \
+  i = (m68k_cycles) - i; \
+  SekRunM68k(i); \
+  if (!(Pico32x.emu_flags & (P32XF_MSH2POLL|P32XF_MSH2VPOLL))) \
+    sh2_execute(&msh2, CYCLES_M68K2SH2(i)); \
+  if (!(Pico32x.emu_flags & (P32XF_SSH2POLL|P32XF_SSH2VPOLL))) \
+    sh2_execute(&ssh2, CYCLES_M68K2SH2(i)); \
 }
 
-#define RUN_SH2S RUN_SH2S_SIMPLE
+//#define CPUS_RUN CPUS_RUN_SIMPLE
+#define CPUS_RUN CPUS_RUN_LOCKSTEP
 
 #include "../pico_cmn.c"
 
@@ -160,5 +174,6 @@ void PicoFrame32x(void)
 
   PicoFrameStart();
   PicoFrameHints();
+  elprintf(EL_32X, "poll: %02x", Pico32x.emu_flags);
 }