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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "Common.h"
#include "DSPCore.h"
#include "DSPHost.h"
#include "DSPHWInterface.h"
#include "DSPInterpreter.h"
// The hardware adpcm decoder :)
s16 ADPCM_Step(u32& _rSamplePos)
{
const s16 *pCoefTable = (const s16 *)&g_dsp.ifx_regs[DSP_COEF_A1_0];
if (((_rSamplePos) & 15) == 0)
{
g_dsp.ifx_regs[DSP_PRED_SCALE] = DSPHost_ReadHostMemory((_rSamplePos & ~15) >> 1);
_rSamplePos += 2;
}
int scale = 1 << (g_dsp.ifx_regs[DSP_PRED_SCALE] & 0xF);
int coef_idx = g_dsp.ifx_regs[DSP_PRED_SCALE] >> 4;
s32 coef1 = pCoefTable[coef_idx * 2 + 0];
s32 coef2 = pCoefTable[coef_idx * 2 + 1];
int temp = (_rSamplePos & 1) ?
(DSPHost_ReadHostMemory(_rSamplePos >> 1) & 0xF) :
(DSPHost_ReadHostMemory(_rSamplePos >> 1) >> 4);
if (temp >= 8)
temp -= 16;
// 0x400 = 0.5 in 11-bit fixed point
int val = (scale * temp) + ((0x400 + coef1 * (s16)g_dsp.ifx_regs[DSP_YN1] + coef2 * (s16)g_dsp.ifx_regs[DSP_YN2]) >> 11);
// Clamp values.
if (val > 0x7FFF)
val = 0x7FFF;
else if (val < -0x7FFF)
val = -0x7FFF;
g_dsp.ifx_regs[DSP_YN2] = g_dsp.ifx_regs[DSP_YN1];
g_dsp.ifx_regs[DSP_YN1] = val;
_rSamplePos++;
// The advanced interpolation (linear, polyphase,...) is done by the UCode,
// so we don't need to bother with it here.
return val;
}
u16 dsp_read_aram_d3()
{
// Zelda ucode reads ARAM through 0xffd3.
const u32 EndAddress = (g_dsp.ifx_regs[DSP_ACEAH] << 16) | g_dsp.ifx_regs[DSP_ACEAL];
u32 Address = (g_dsp.ifx_regs[DSP_ACCAH] << 16) | g_dsp.ifx_regs[DSP_ACCAL];
u16 val = 0;
switch (g_dsp.ifx_regs[DSP_FORMAT]) {
case 0x5: // u8 reads
val = DSPHost_ReadHostMemory(Address);
Address++;
break;
case 0x6: // u16 reads
val = (DSPHost_ReadHostMemory(Address*2) << 8) | DSPHost_ReadHostMemory(Address*2 + 1);
Address++;
break;
default:
ERROR_LOG(DSPLLE, "dsp_read_aram_d3: Unseen Format %i", g_dsp.ifx_regs[DSP_FORMAT]);
break;
}
if (Address >= EndAddress)
{
// Set address back to start address.
Address = (g_dsp.ifx_regs[DSP_ACSAH] << 16) | g_dsp.ifx_regs[DSP_ACSAL];
}
g_dsp.ifx_regs[DSP_ACCAH] = Address >> 16;
g_dsp.ifx_regs[DSP_ACCAL] = Address & 0xffff;
return val;
}
void dsp_write_aram_d3(u16 value)
{
// Zelda ucode writes a bunch of zeros to ARAM through d3 during
// initialization. Don't know if it ever does it later, too.
// const u32 EndAddress = (g_dsp.ifx_regs[DSP_ACEAH] << 16) | g_dsp.ifx_regs[DSP_ACEAL]; // Unused?
u32 Address = (g_dsp.ifx_regs[DSP_ACCAH] << 16) | g_dsp.ifx_regs[DSP_ACCAL];
switch (g_dsp.ifx_regs[DSP_FORMAT]) {
case 0xA: // u16 writes
DSPHost_WriteHostMemory(value >> 8, Address*2);
DSPHost_WriteHostMemory(value & 0xFF, Address*2 + 1);
Address++;
break;
default:
ERROR_LOG(DSPLLE, "dsp_write_aram_d3: Unseen Format %i", g_dsp.ifx_regs[DSP_FORMAT]);
break;
}
g_dsp.ifx_regs[DSP_ACCAH] = Address >> 16;
g_dsp.ifx_regs[DSP_ACCAL] = Address & 0xffff;
}
u16 dsp_read_accelerator()
{
const u32 EndAddress = (g_dsp.ifx_regs[DSP_ACEAH] << 16) | g_dsp.ifx_regs[DSP_ACEAL];
u32 Address = (g_dsp.ifx_regs[DSP_ACCAH] << 16) | g_dsp.ifx_regs[DSP_ACCAL];
u16 val;
// let's do the "hardware" decode DSP_FORMAT is interesting - the Zelda
// ucode seems to indicate that the bottom two bits specify the "read size"
// and the address multiplier. The bits above that may be things like sign
// extention and do/do not use ADPCM. It also remains to be figured out
// whether there's a difference between the usual accelerator "read
// address" and 0xd3.
switch (g_dsp.ifx_regs[DSP_FORMAT])
{
case 0x00: // ADPCM audio
val = ADPCM_Step(Address);
break;
case 0x0A: // 16-bit PCM audio
val = (DSPHost_ReadHostMemory(Address*2) << 8) | DSPHost_ReadHostMemory(Address*2 + 1);
g_dsp.ifx_regs[DSP_YN2] = g_dsp.ifx_regs[DSP_YN1];
g_dsp.ifx_regs[DSP_YN1] = val;
Address++;
break;
case 0x19: // 8-bit PCM audio
val = DSPHost_ReadHostMemory(Address) << 8; // probably wrong
g_dsp.ifx_regs[DSP_YN2] = g_dsp.ifx_regs[DSP_YN1];
g_dsp.ifx_regs[DSP_YN1] = val;
Address++;
break;
default:
ERROR_LOG(DSPLLE, "Unknown DSP Format %x", g_dsp.ifx_regs[DSP_FORMAT]);
val = 0;
}
// TODO: Take GAIN into account, whatever it is.
// adpcm = 0, pcm8 = 0x100, pcm16 = 0x800
// games using pcm8 : Phoenix Wright Ace Attorney (Wiiware), Megaman 9-10 (WiiWare)
if (g_dsp.ifx_regs[DSP_GAIN] > 0)
{
//NOTICE_LOG(DSPLLE,"format: 0x%04x - val: 0x%04x - gain: 0x%04x", g_dsp.ifx_regs[DSP_FORMAT], val, g_dsp.ifx_regs[DSP_GAIN]);
}
// Check for loop.
if (Address >= EndAddress)
{
// Set address back to start address.
Address = (g_dsp.ifx_regs[DSP_ACSAH] << 16) | g_dsp.ifx_regs[DSP_ACSAL];
// Do we really need both? (nakee: seems to cause problems with some
// AX games)
// DSPHost_InterruptRequest();
// DSPCore_SetException(EXP_2);
DSPCore_SetException(EXP_ACCOV);
// Somehow, YN1 and YN2 must be initialized with their "loop" values,
// so yeah, it seems likely that we should raise an exception to let
// the DSP program do that, at least if DSP_FORMAT == 0x0A.
}
//else
// DSPCore_SetException(EXP_6); // test! (bunch of NOPs there - helps "SMB S&R (wii)")
g_dsp.ifx_regs[DSP_ACCAH] = Address >> 16;
g_dsp.ifx_regs[DSP_ACCAL] = Address & 0xffff;
return val;
}
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