Reorganised slightly, and added my spc sample ripper + spc2it.

2025-02-21 04:09:25 +11:00 · 2018-09-03 02:45:47 +10:00
parent 48dcc09399
commit 45ec9cf2cf
28 changed files with 6195 additions and 0 deletions
--- a/spctools/spc2it/emu.c
+++ b/spctools/spc2it/emu.c
@@ -0,0 +1,210 @@
+/****************************************************
+*Part of SPC2IT, read readme.md for more information*
+****************************************************/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "sound.h"
+#include "spc2ittypes.h"
+#include "sneese_spc.h"
+
+u8 SPC_DSP[256];
+u8 SPCRAM[65536];
+u32 Map_Address;
+u32 SPC_DSP_DATA;
+u32 Map_Byte;
+u8 In_CPU;
+u32 SPC_CPU_cycle_divisor;
+u32 SPC_CPU_cycle_multiplicand;
+u32 SPC_CPU_cycles;
+u32 SPC_CPU_cycles_mul;
+u32 sound_cycle_latch;
+
+void (*SPC_Write_DSP_Hook)(u8); // function pointer
+
+// ID tag stuff
+s32 SPCtime;
+SPCFileInformation *SPCInfo;
+
+static s32 LoadZState(char *fn)
+{
+	SPCFile *sFile = calloc(1, sizeof(SPCFile));
+	if (sFile == NULL)
+	{
+		printf("Error: could not allocate memory for SPCFile struct\n");
+		exit(1);
+	}
+	FILE *f = fopen(fn, "rb");
+	if (f == NULL)
+	{
+		printf("Error: can't open file\n");
+		exit(1);
+	}
+	fseek(f, 0, SEEK_SET);
+	fread(sFile, sizeof(SPCFile), 1, f);
+	fclose(f);
+	if (strncmp("SNES-SPC700 Sound File Data", sFile->FileTag, 27))
+	{
+		printf("Error: invalid file format\n");
+		exit(1);
+	}
+	memcpy(&active_context->PC.w, sFile->Registers.PC, 2);
+	active_context->YA.b.l = sFile->Registers.A;
+	active_context->X = sFile->Registers.X;
+	active_context->YA.b.h = sFile->Registers.Y;
+	active_context->SP = 0x100 + sFile->Registers.SP;
+	active_context->PSW = sFile->Registers.PSW;
+	memcpy(SPCRAM, sFile->RAM, 65536);
+	memcpy(SPC_DSP, sFile->DSPBuffer, 128);
+	SPCInfo = calloc(1, sizeof(SPCFileInformation));
+	if (SPCInfo == NULL)
+	{
+		printf("Error: could not allocate memory for SPCInfo struct\n");
+		exit(1);
+	}
+	memcpy(SPCInfo, &sFile->Information, sizeof(SPCFileInformation));
+	char songLen[4];
+	strncpy(songLen, SPCInfo->SongLength, 3);
+	if (songLen[0] >= 0)
+		SPCtime = atoi(songLen);
+	else
+		SPCtime = 0;
+	if (0 == (SPC_CTRL & 0x80))
+		active_context->FFC0_Address = SPCRAM;
+	active_context->timers[0].target = (u8)(SPCRAM[0xFA] - 1) + 1;
+	active_context->timers[1].target = (u8)(SPCRAM[0xFB] - 1) + 1;
+	active_context->timers[2].target = (u8)(SPCRAM[0xFC] - 1) + 1;
+	active_context->timers[0].counter = SPCRAM[0xFD] & 0xF;
+	active_context->timers[1].counter = SPCRAM[0xFE] & 0xF;
+	active_context->timers[2].counter = SPCRAM[0xFF] & 0xF;
+	active_context->PORT_R[0] = SPCRAM[0xF4];
+	active_context->PORT_R[1] = SPCRAM[0xF5];
+	active_context->PORT_R[2] = SPCRAM[0xF6];
+	active_context->PORT_R[3] = SPCRAM[0xF7];
+
+	SPC_CPU_cycle_multiplicand = 1;
+	SPC_CPU_cycle_divisor = 1;
+	SPC_CPU_cycles_mul = 0;
+	spc_restore_flags();
+	free(sFile);
+	return (0);
+}
+
+// PUBLIC (non-static) functions
+
+s32 SPCInit(char *fn)
+{
+	Reset_SPC();
+	if (LoadZState(fn))
+		return 1;
+	return 0;
+}
+
+void SPCAddWriteDSPCallback(void (*ToAddCallback)(u8))
+{
+	SPC_Write_DSP_Hook = ToAddCallback;
+}
+
+// Called from SPC 700 engine
+
+void DisplaySPC()
+{
+}
+
+void InvalidSPCOpcode()
+{
+	exit(-1);
+}
+
+void SPC_READ_DSP()
+{
+	if ((SPC_DSP_ADDR & 0xf) == 8) // ENVX
+		SPC_DSP[SPC_DSP_ADDR] = SNDDoEnv(SPC_DSP_ADDR >> 4) >> 24;
+}
+
+void SPC_WRITE_DSP()
+{	
+	s32 addr_lo = SPC_DSP_ADDR & 0xF, addr_hi = SPC_DSP_ADDR >> 4;
+	switch (addr_lo)
+	{
+	case 3: // Pitch hi
+		SPC_DSP_DATA &= 0x3F;
+		break;
+	case 5: // ADSR1
+		if ((SPC_DSP[0x4C] & (1 << addr_hi)) && ((SPC_DSP_DATA & 0x80) != (SPC_DSP[SPC_DSP_ADDR] & 0x80)))
+		{
+			s32 i;
+			// First of all, in case anything was already
+			// going on, finish it up
+			SNDDoEnv(addr_hi);
+			if (SPC_DSP_DATA & 0x80)
+			{
+				// switch to ADSR--not sure what to do
+				i = SPC_DSP[(addr_hi << 4) + 6];
+				SNDvoices[addr_hi].envstate = ATTACK;
+				SNDvoices[addr_hi].ar = SPC_DSP_DATA & 0xF;
+				SNDvoices[addr_hi].dr = SPC_DSP_DATA >> 4 & 7;
+				SNDvoices[addr_hi].sr = i & 0x1f;
+				SNDvoices[addr_hi].sl = i >> 5;
+			}
+			else
+			{
+				// switch to a GAIN mode
+				i = SPC_DSP[(addr_hi << 4) + 7];
+				if (i & 0x80)
+				{
+					SNDvoices[addr_hi].envstate = i >> 5;
+					SNDvoices[addr_hi].gn = i & 0x1F;
+				}
+				else
+				{
+					SNDvoices[addr_hi].envx = (i & 0x7F) << 24;
+					SNDvoices[addr_hi].envstate = DIRECT;
+				}
+			}
+		}
+		break;
+	case 6: // ADSR2
+		// Finish up what was going on
+		SNDDoEnv(addr_hi);
+		SNDvoices[addr_hi].sr = SPC_DSP_DATA & 0x1f;
+		SNDvoices[addr_hi].sl = SPC_DSP_DATA >> 5;
+		break;
+	case 7: // GAIN
+		if ((SPC_DSP[0x4C] & (1 << addr_hi)) && (SPC_DSP_DATA != SPC_DSP[SPC_DSP_ADDR]) &&
+		    !(SPC_DSP[(addr_hi << 4) + 5] & 0x80))
+		{
+			if (SPC_DSP_DATA & 0x80)
+			{
+				// Finish up what was going on
+				SNDDoEnv(addr_hi);
+				SNDvoices[addr_hi].envstate = SPC_DSP_DATA >> 5;
+				SNDvoices[addr_hi].gn = SPC_DSP_DATA & 0x1F;
+			}
+			else
+			{
+				SNDvoices[addr_hi].envx = (SPC_DSP_DATA & 0x7F) << 24;
+				SNDvoices[addr_hi].envstate = DIRECT;
+			}
+		}
+		break;
+	// These are general registers
+	case 12: // 0xc
+		switch (addr_hi)
+		{
+		case 4: // Key on
+			SNDNoteOn(SPC_DSP_DATA);
+			SPC_DSP_DATA = SPC_DSP[0x4C];
+			break;
+		case 5: // Key off
+			SNDNoteOff(SPC_DSP_DATA);
+			SPC_DSP_DATA = 0;
+			break;
+		}
+		break;
+	}
+
+	SPC_DSP[SPC_DSP_ADDR] = SPC_DSP_DATA;
+}