initial upstream import

[drnoksnes] / spc700.h

diff --git a/spc700.h b/spc700.h
new file mode 100644 (file)
index 0000000..377ab9c
--- /dev/null
+++ b/spc700.h
@@ -0,0 +1,173 @@
+/*
+ * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
+ *
+ * (c) Copyright 1996 - 2001 Gary Henderson (gary.henderson@ntlworld.com) and
+ *                           Jerremy Koot (jkoot@snes9x.com)
+ *
+ * Super FX C emulator code 
+ * (c) Copyright 1997 - 1999 Ivar (ivar@snes9x.com) and
+ *                           Gary Henderson.
+ * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
+ *
+ * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
+ * C4 asm and some C emulation code (c) Copyright 2000 zsKnight and _Demo_.
+ * C4 C code (c) Copyright 2001 Gary Henderson (gary.henderson@ntlworld.com).
+ *
+ * DOS port code contains the works of other authors. See headers in
+ * individual files.
+ *
+ * Snes9x homepage: http://www.snes9x.com
+ *
+ * Permission to use, copy, modify and distribute Snes9x in both binary and
+ * source form, for non-commercial purposes, is hereby granted without fee,
+ * providing that this license information and copyright notice appear with
+ * all copies and any derived work.
+ *
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event shall the authors be held liable for any damages
+ * arising from the use of this software.
+ *
+ * Snes9x is freeware for PERSONAL USE only. Commercial users should
+ * seek permission of the copyright holders first. Commercial use includes
+ * charging money for Snes9x or software derived from Snes9x.
+ *
+ * The copyright holders request that bug fixes and improvements to the code
+ * should be forwarded to them so everyone can benefit from the modifications
+ * in future versions.
+ *
+ * Super NES and Super Nintendo Entertainment System are trademarks of
+ * Nintendo Co., Limited and its subsidiary companies.
+ */
+#ifndef _SPC700_H_
+#define _SPC700_H_
+
+#ifdef SPCTOOL
+#define NO_CHANNEL_STRUCT
+#include "spctool/dsp.h"
+#include "spctool/spc700.h"
+#include "spctool/soundmod.h"
+#endif
+
+
+#define Carry       1
+#define Zero        2
+#define Interrupt   4
+#define HalfCarry   8
+#define BreakFlag  16
+#define DirectPageFlag 32
+#define Overflow   64
+#define Negative  128
+
+#define APUClearCarry() (IAPU._Carry = 0)
+#define APUSetCarry() (IAPU._Carry = 1)
+#define APUSetInterrupt() (IAPU.P |= Interrupt)
+#define APUClearInterrupt() (IAPU.P &= ~Interrupt)
+#define APUSetHalfCarry() (IAPU.P |= HalfCarry)
+#define APUClearHalfCarry() (IAPU.P &= ~HalfCarry)
+#define APUSetBreak() (IAPU.P |= BreakFlag)
+#define APUClearBreak() (IAPU.P &= ~BreakFlag)
+#define APUSetDirectPage() (IAPU.P |= DirectPageFlag)
+#define APUClearDirectPage() (IAPU.P &= ~DirectPageFlag)
+#define APUSetOverflow() (IAPU._Overflow = 1)
+#define APUClearOverflow() (IAPU._Overflow = 0)
+
+#define APUCheckZero() (IAPU._Zero == 0)
+#define APUCheckCarry() (IAPU._Carry)
+#define APUCheckInterrupt() (IAPU.P & Interrupt)
+#define APUCheckHalfCarry() (IAPU.P & HalfCarry)
+#define APUCheckBreak() (IAPU.P & BreakFlag)
+#define APUCheckDirectPage() (IAPU.P & DirectPageFlag)
+#define APUCheckOverflow() (IAPU._Overflow)
+#define APUCheckNegative() (IAPU._Zero & 0x80)
+
+//#define APUClearFlags(f) (IAPU.P &= ~(f))
+//#define APUSetFlags(f)   (IAPU.P |=  (f))
+//#define APUCheckFlag(f)  (IAPU.P &   (f))
+
+typedef union
+{
+#ifdef LSB_FIRST
+    struct { uint8 A, Y; } B;
+#else
+    struct { uint8 Y, A; } B;
+#endif
+    uint16 W;
+       uint32 _padder; // make sure this whole thing takes 4 bytes
+} YAndA;
+
+struct SAPURegisters{
+    uint8  P;
+    YAndA YA;
+    uint8  X;
+    uint8  S;
+    uint16  PC;
+};
+
+//EXTERN_C struct SAPURegisters APURegisters;
+
+// Needed by ILLUSION OF GAIA
+//#define ONE_APU_CYCLE 14
+#define ONE_APU_CYCLE 21
+
+// Needed by all games written by the software company called Human
+//#define ONE_APU_CYCLE_HUMAN 17
+#define ONE_APU_CYCLE_HUMAN 21
+
+// 1.953us := 1.024065.54MHz
+
+#ifdef SPCTOOL
+EXTERN_C int32 ESPC (int32);
+
+#define APU_EXECUTE() \
+{ \
+    int32 l = (CPU.Cycles - CPU.APU_Cycles) / 14; \
+    if (l > 0) \
+    { \
+        l -= _EmuSPC(l); \
+        CPU.APU_Cycles += l * 14; \
+    } \
+}
+
+#else
+
+#ifdef ASM_SPC700
+
+// return cycles left (always negative)
+extern "C" int spc700_execute(int cycles);
+
+#define APU_EXECUTE1() \
+{ \
+       CPU.APU_Cycles -= spc700_execute(0); \
+}
+
+// notaz: CPU.APU_APUExecuting: 0 == disabled, 1 == enabled normal, 3 == enabled in hack mode
+
+#define APU_EXECUTE(mode) \
+if (CPU.APU_APUExecuting == mode) \
+{\
+       if(CPU.APU_Cycles <= CPU.Cycles) { \
+               int cycles = CPU.Cycles - CPU.APU_Cycles; \
+               CPU.APU_Cycles += cycles - spc700_execute(cycles); \
+       } \
+}
+
+#else
+
+#define APU_EXECUTE1() \
+{ \
+    CPU.APU_Cycles += S9xAPUCycles [*IAPU.PC]; \
+    (*S9xApuOpcodes[*IAPU.PC]) (); \
+}
+
+#define APU_EXECUTE(x) \
+if (CPU.APU_APUExecuting) \
+{\
+    while (CPU.APU_Cycles <= CPU.Cycles) \
+       APU_EXECUTE1(); \
+}
+
+#endif // ASM_SPC700
+
+#endif // SPCTOOL
+
+#endif