mirror of
https://github.com/libretro/fixGB.git
synced 2024-11-27 03:00:23 +00:00
f8fc506ae9
-corrected several registers and added some unofficial (FF72-FF77) regs -added HuC1, MBC2 and MBC3 RTC support and corrected MBC bugs -proper PPU line 0 set, fixes several graphical glitches
859 lines
20 KiB
C
859 lines
20 KiB
C
/*
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* Copyright (C) 2017 FIX94
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*
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* This software may be modified and distributed under the terms
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* of the MIT license. See the LICENSE file for details.
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*/
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#include <stdio.h>
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#include <stdbool.h>
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#include <inttypes.h>
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#include <malloc.h>
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#include <string.h>
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#include "apu.h"
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#include "audio.h"
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#include "mem.h"
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#include "cpu.h"
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#define P1_ENABLE_LEFT (1<<0)
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#define P2_ENABLE_LEFT (1<<1)
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#define WAV_ENABLE_LEFT (1<<2)
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#define NOISE_ENABLE_LEFT (1<<3)
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#define P1_ENABLE_RIGHT (1<<4)
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#define P2_ENABLE_RIGHT (1<<5)
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#define WAV_ENABLE_RIGHT (1<<6)
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#define NOISE_ENABLE_RIGHT (1<<7)
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static uint8_t APU_IO_Reg[0x50];
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static float lpVal;
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static float hpVal;
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static const float volLevel[8] = {
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0.125f, 0.25f, 0.375f, 0.5f, 0.625f, 0.75f, 0.875f, 1.0f,
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};
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static float *apuOutBuf;
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static uint32_t apuBufSize;
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static uint32_t apuBufSizeBytes;
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static uint32_t curBufPos;
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static uint32_t apuFrequency;
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static uint16_t freq1;
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static uint16_t freq2;
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static uint16_t wavFreq;
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static uint16_t noiseFreq;
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static uint16_t noiseShiftReg;
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static uint8_t p1LengthCtr, p2LengthCtr, noiseLengthCtr;
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static uint8_t wavLinearCtr;
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static uint16_t wavLengthCtr;
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static uint8_t wavVolShift;
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static uint16_t modeCurCtr = 0;
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static uint16_t p1freqCtr, p2freqCtr, wavFreqCtr, noiseFreqCtr;
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static uint8_t p1Cycle, p2Cycle, wavCycle;
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static uint8_t modePos = 0;
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static bool p1haltloop, p2haltloop, wavhaltloop, noisehaltloop;
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static bool p1dacenable, p2dacenable, wavdacenable, noisedacenable;
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static bool p1enable, p2enable, wavenable, noiseenable;
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static bool soundEnabled;
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static bool noiseMode1;
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static envelope_t p1Env, p2Env, noiseEnv;
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typedef struct _sweep_t {
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bool enabled;
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bool negative;
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bool inNegative;
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uint8_t period;
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uint8_t divider;
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uint8_t shift;
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uint16_t pfreq;
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} sweep_t;
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static sweep_t p1Sweep;
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//used externally
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const uint8_t pulseSeqs[4][8] = {
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{ 0, 1, 0, 0, 0, 0, 0, 0 },
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{ 0, 1, 1, 0, 0, 0, 0, 0 },
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{ 0, 1, 1, 1, 1, 0, 0, 0 },
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{ 1, 0, 0, 1, 1, 1, 1, 1 },
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};
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static const uint16_t noisePeriodNtsc[8] = {
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8, 16, 32, 48, 64, 80, 96, 112,
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};
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//wav values from http://gbdev.gg8.se/wiki/articles/Gameboy_sound_hardware#Power_Control
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static const uint8_t startWavSetDMG[0x10] = {
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0x84, 0x40, 0x43, 0xAA, 0x2D, 0x78, 0x92, 0x3C,
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0x60, 0x59, 0x59, 0xB0, 0x34, 0xB8, 0x2E, 0xDA,
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};
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static const uint8_t startWavSetCGB[0x10] = {
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0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
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0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF, 0x00, 0xFF,
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};
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//used externally
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const uint16_t *noisePeriod;
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static const uint8_t *p1seq = pulseSeqs[0],
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*p2seq = pulseSeqs[1];
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#define M_2_PI 6.28318530717958647692
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void apuInitBufs()
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{
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noisePeriod = noisePeriodNtsc;
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//effective frequency for 60.000Hz Video out
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//apuFrequency = 526680;
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//effective frequency for original LCD Video out
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apuFrequency = 262144;
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double dt = 1.0/((double)apuFrequency);
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//LP at 22kHz
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double rc = 1.0/(M_2_PI * 22000.0);
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lpVal = dt / (rc + dt);
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//HP at 40Hz
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rc = 1.0/(M_2_PI * 40.0);
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hpVal = rc / (rc + dt);
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apuBufSize = apuFrequency/60*2;
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apuBufSizeBytes = apuBufSize*sizeof(float);
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apuOutBuf = (float*)malloc(apuBufSizeBytes);
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}
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void apuDeinitBufs()
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{
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if(apuOutBuf)
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free(apuOutBuf);
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apuOutBuf = NULL;
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}
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extern bool allowCgbRegs;
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void apuInit()
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{
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memset(APU_IO_Reg,0,0x50);
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if(allowCgbRegs) //essentially 50% duty pulse on CGB
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memcpy(APU_IO_Reg+0x30,startWavSetCGB,0x10);
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else //relatively random audio pattern on DMG
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memcpy(APU_IO_Reg+0x30,startWavSetDMG,0x10);
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memset(apuOutBuf, 0, apuBufSizeBytes);
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curBufPos = 0;
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freq1 = 0; freq2 = 0; wavFreq = 0; noiseFreq = 0;
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noiseShiftReg = 1;
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p1LengthCtr = 0; p2LengthCtr = 0;
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noiseLengthCtr = 0; wavLengthCtr = 0;
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wavLinearCtr = 0;
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p1freqCtr = 0; p2freqCtr = 0; wavFreqCtr = 0, noiseFreqCtr = 0;
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p1Cycle = 0; p2Cycle = 0; wavCycle = 0;
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wavVolShift = 4; //default
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memset(&p1Env,0,sizeof(envelope_t));
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memset(&p2Env,0,sizeof(envelope_t));
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memset(&noiseEnv,0,sizeof(envelope_t));
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memset(&p1Sweep,0,sizeof(sweep_t));
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p1haltloop = false; p2haltloop = false;
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wavhaltloop = false; noisehaltloop = false;
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p1enable = false; p2enable = false;
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wavenable = false; noiseenable = false;
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p1dacenable = false; p2dacenable = false;
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wavdacenable = false; noisedacenable = false;
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noiseMode1 = false;
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//GB Bootrom
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soundEnabled = true;
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APU_IO_Reg[0x24] = 0x77;
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APU_IO_Reg[0x25] = 0xF3;
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}
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static float lastHPOutLeft = 0, lastHPOutRight = 0, lastLPOutLeft = 0, lastLPOutRight = 0;
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static uint8_t lastP1OutLeft = 0, lastP2OutLeft = 0, lastWavOutLeft = 0, lastNoiseOutLeft = 0;
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static uint8_t lastP1OutRight = 0, lastP2OutRight = 0, lastWavOutRight = 0, lastNoiseOutRight = 0;
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extern bool emuSkipVsync, emuSkipFrame;
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//used externally
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uint8_t curP1Out = 0, curP2Out = 0, curWavOut = 0, curNoiseOut = 0;
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bool apuCycle()
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{
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if(curBufPos == apuBufSize)
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{
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int updateRes = audioUpdate();
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if(updateRes == 0)
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{
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emuSkipFrame = false;
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emuSkipVsync = false;
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return false;
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}
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if(updateRes > 6)
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{
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emuSkipVsync = true;
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emuSkipFrame = true;
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}
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else
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{
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emuSkipFrame = false;
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if(updateRes > 2)
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emuSkipVsync = true;
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else
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emuSkipVsync = false;
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}
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curBufPos = 0;
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}
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uint8_t p1OutLeft = lastP1OutLeft, p2OutLeft = lastP2OutLeft,
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wavOutLeft = lastWavOutLeft, noiseOutLeft = lastNoiseOutLeft;
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uint8_t p1OutRight = lastP1OutRight, p2OutRight = lastP2OutRight,
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wavOutRight = lastWavOutRight, noiseOutRight = lastNoiseOutRight;
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uint8_t apuMasterVolLeft = ((APU_IO_Reg[0x24]>>4)&7), apuMasterVolRight = (APU_IO_Reg[0x24]&7);
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if(p1enable && p1dacenable)
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{
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if(p1seq[p1Cycle] && freq1 > 0 && freq1 <= 0x7FF)
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{
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curP1Out = p1Env.curVol;
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if(APU_IO_Reg[0x25] & P1_ENABLE_LEFT)
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lastP1OutLeft = p1OutLeft = curP1Out;
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if(APU_IO_Reg[0x25] & P1_ENABLE_RIGHT)
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lastP1OutRight = p1OutRight = curP1Out;
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}
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else
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{
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curP1Out = 0;
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if(APU_IO_Reg[0x25] & P1_ENABLE_LEFT)
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p1OutLeft = 0;
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if(APU_IO_Reg[0x25] & P1_ENABLE_RIGHT)
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p1OutRight = 0;
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}
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}
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else
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curP1Out = 0;
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if(p2enable && p2dacenable)
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{
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if(p2seq[p2Cycle] && freq2 > 0 && freq2 <= 0x7FF)
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{
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curP2Out = p2Env.curVol;
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if(APU_IO_Reg[0x25] & P2_ENABLE_LEFT)
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lastP2OutLeft = p2OutLeft = curP2Out;
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if(APU_IO_Reg[0x25] & P2_ENABLE_RIGHT)
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lastP2OutRight = p2OutRight = curP2Out;
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}
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else
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{
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curP2Out = 0;
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if(APU_IO_Reg[0x25] & P2_ENABLE_LEFT)
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p2OutLeft = 0;
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if(APU_IO_Reg[0x25] & P2_ENABLE_RIGHT)
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p2OutRight = 0;
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}
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}
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else
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curP2Out = 0;
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if(wavenable && wavdacenable)
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{
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uint8_t v = APU_IO_Reg[0x30+(wavCycle>>1)];
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if((wavCycle&1)==0)
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v >>= 4;
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else
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v &= 0xF;
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v>>=wavVolShift;
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if(v)// && wavFreq >= 2)
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{
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curWavOut = v;
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if(APU_IO_Reg[0x25] & WAV_ENABLE_LEFT)
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lastWavOutLeft = wavOutLeft = curWavOut;
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if(APU_IO_Reg[0x25] & WAV_ENABLE_RIGHT)
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lastWavOutRight = wavOutRight = curWavOut;
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}
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else
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{
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curWavOut = 0;
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if(APU_IO_Reg[0x25] & WAV_ENABLE_LEFT)
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wavOutLeft = 0;
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if(APU_IO_Reg[0x25] & WAV_ENABLE_RIGHT)
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wavOutRight = 0;
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}
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}
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else
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curWavOut = 0;
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if(noiseenable && noisedacenable)
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{
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if((noiseShiftReg&1) == 0 && noiseFreq > 0)
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{
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curNoiseOut = noiseEnv.curVol;
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if(APU_IO_Reg[0x25] & NOISE_ENABLE_LEFT)
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lastNoiseOutLeft = noiseOutLeft = curNoiseOut;
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if(APU_IO_Reg[0x25] & NOISE_ENABLE_RIGHT)
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lastNoiseOutRight = noiseOutRight = curNoiseOut;
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}
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else
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{
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curNoiseOut = 0;
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if(APU_IO_Reg[0x25] & NOISE_ENABLE_LEFT)
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noiseOutLeft = 0;
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if(APU_IO_Reg[0x25] & NOISE_ENABLE_RIGHT)
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noiseOutRight = 0;
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}
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}
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else
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curNoiseOut = 0;
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//gen output Left
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float curInLeft = ((float)(p1OutLeft + p2OutLeft + wavOutLeft + noiseOutLeft))*volLevel[apuMasterVolLeft]/60.f;
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float curLPOutLeft = lastLPOutLeft+(lpVal*(curInLeft-lastLPOutLeft));
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float curHPOutLeft = hpVal*(lastHPOutLeft+curLPOutLeft-curInLeft);
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//gen output Right
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float curInRight = ((float)(p1OutRight + p2OutRight + wavOutRight + noiseOutRight))*volLevel[apuMasterVolRight]/60.f;
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float curLPOutRight = lastLPOutRight+(lpVal*(curInRight-lastLPOutRight));
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float curHPOutRight = hpVal*(lastHPOutRight+curLPOutRight-curInRight);
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//set output Left
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apuOutBuf[curBufPos++] = ((soundEnabled)?(curHPOutLeft):0);
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//set output Right
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apuOutBuf[curBufPos++] = ((soundEnabled)?(curHPOutRight):0);
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//save HP and LP Left
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lastLPOutLeft = curLPOutLeft;
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lastHPOutLeft = curHPOutLeft;
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//save HP and LP Right
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lastLPOutRight = curLPOutRight;
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lastHPOutRight = curHPOutRight;
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return true;
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}
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void doEnvelopeLogic(envelope_t *env)
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{
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if(env->divider == 0)
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{
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if(env->period)
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{
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if(env->modeadd)
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{
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if(env->curVol < 15)
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env->curVol++;
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}
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else
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{
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if(env->curVol > 0)
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env->curVol--;
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}
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}
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//period 0 is actually period 8!
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env->divider = (env->period-1)&7;
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}
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else
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env->divider--;
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}
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void sweepUpdateFreq(sweep_t *sw, uint16_t *freq, bool update)
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{
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if(!sw->enabled)
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return;
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//printf("%i\n", *freq);
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uint16_t inFreq = sw->pfreq;
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uint16_t shiftVal = (inFreq >> sw->shift);
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if(sw->negative)
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{
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sw->inNegative = true;
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inFreq -= shiftVal;
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}
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else
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inFreq += shiftVal;
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if(inFreq <= 0x7FF)
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{
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if(sw->enabled && sw->shift && sw->period && update)
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{
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*freq = inFreq;
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sw->pfreq = inFreq;
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}
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}
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else
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{
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//printf("Freq disabled\n");
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p1enable = false;
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}
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}
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void doSweepLogic(sweep_t *sw, uint16_t *freq)
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{
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if(sw->divider == 0)
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{
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//printf("Divider 0\n");
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if(sw->period)
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{
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sweepUpdateFreq(sw, freq, true);
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//gameboy checks a SECOND time after updating...
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uint16_t inFreq = sw->pfreq;
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uint16_t shiftVal = (inFreq >> sw->shift);
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if(sw->negative)
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inFreq -= shiftVal;
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else
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inFreq += shiftVal;
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if(inFreq > 0x7FF)
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{
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//printf("Freq disabled\n");
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p1enable = false;
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}
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}
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//period 0 is actually period 8!
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sw->divider = (sw->period-1)&7;
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}
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else
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sw->divider--;
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}
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void apuClockA()
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{
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//printf("Len clock\n");
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if(p1LengthCtr && !p1haltloop)
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{
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p1LengthCtr--;
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if(p1LengthCtr == 0)
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p1enable = false;
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}
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if(p2LengthCtr && !p2haltloop)
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{
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p2LengthCtr--;
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if(p2LengthCtr == 0)
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p2enable = false;
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}
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if(wavLengthCtr && !wavhaltloop)
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{
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wavLengthCtr--;
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if(wavLengthCtr == 0)
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wavenable = false;
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}
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if(noiseLengthCtr && !noisehaltloop)
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{
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noiseLengthCtr--;
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if(noiseLengthCtr == 0)
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noiseenable = false;
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}
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}
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void apuClockB()
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{
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if(p1LengthCtr)
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doEnvelopeLogic(&p1Env);
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if(p2LengthCtr)
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doEnvelopeLogic(&p2Env);
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if(noiseLengthCtr)
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doEnvelopeLogic(&noiseEnv);
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}
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void apuClockTimers()
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{
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if(modeCurCtr == 0)
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{
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modePos++;
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if(modePos&1)
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apuClockA();
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if(modePos == 3 || modePos == 7)
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{
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//printf("sweep clock\n");
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if(p1LengthCtr)
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doSweepLogic(&p1Sweep, &freq1);
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}
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if(modePos >= 8)
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{
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apuClockB();
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modePos = 0;
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}
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modeCurCtr = 8192;
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}
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if(modeCurCtr)
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modeCurCtr--;
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if(p1freqCtr == 0)
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{
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if(freq1)
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p1freqCtr = (2048-freq1)*4;
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p1Cycle++;
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if(p1Cycle >= 8)
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p1Cycle = 0;
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}
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if(p1freqCtr)
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p1freqCtr--;
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if(p2freqCtr == 0)
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{
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if(freq2)
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p2freqCtr = (2048-freq2)*4;
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p2Cycle++;
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if(p2Cycle >= 8)
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p2Cycle = 0;
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}
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if(p2freqCtr)
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p2freqCtr--;
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if(wavFreqCtr == 0)
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{
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wavFreqCtr = (2048-wavFreq)*2;
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wavCycle++;
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if(wavCycle >= 32)
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wavCycle = 0;
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}
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if(wavFreqCtr)
|
|
wavFreqCtr--;
|
|
|
|
if(noiseFreqCtr == 0)
|
|
{
|
|
noiseFreqCtr = noiseFreq;
|
|
uint8_t cmpBit = noiseMode1 ? (noiseShiftReg>>6)&1 : (noiseShiftReg>>1)&1;
|
|
uint8_t cmpRes = (noiseShiftReg&1)^cmpBit;
|
|
noiseShiftReg >>= 1;
|
|
noiseShiftReg |= cmpRes<<14;
|
|
}
|
|
if(noiseFreqCtr)
|
|
noiseFreqCtr--;
|
|
}
|
|
|
|
void apuSetReg8(uint16_t addr, uint8_t val)
|
|
{
|
|
uint8_t reg = addr&0xFF;
|
|
//printf("APU set %02x %02x\n", reg, val);
|
|
if(reg == 0x26)
|
|
{
|
|
bool wasEnabled = soundEnabled;
|
|
soundEnabled = (val&0x80)!=0;
|
|
if(!soundEnabled)
|
|
{
|
|
// FULL reset of nearly every reg
|
|
memset(APU_IO_Reg,0,0x30);
|
|
// except for the wav buffer
|
|
memset(APU_IO_Reg+0x40,0,0x10);
|
|
memset(&p1Env,0,sizeof(envelope_t));
|
|
memset(&p2Env,0,sizeof(envelope_t));
|
|
memset(&noiseEnv,0,sizeof(envelope_t));
|
|
memset(&p1Sweep,0,sizeof(sweep_t));
|
|
p1LengthCtr = 0; p2LengthCtr = 0;
|
|
wavLengthCtr = 0; noiseLengthCtr = 0;
|
|
p1enable = false; p2enable = false;
|
|
wavenable = false; noiseenable = false;
|
|
p1dacenable = false; p2dacenable = false;
|
|
wavdacenable = false; noisedacenable = false;
|
|
freq1 = 0; freq2 = 0; wavFreq = 0; noiseFreq = 0;
|
|
wavVolShift = 4; //default
|
|
}
|
|
else
|
|
{
|
|
APU_IO_Reg[0x26] = val;
|
|
//on sound powerup, reset frame sequencer
|
|
if(!wasEnabled)
|
|
{
|
|
modeCurCtr = 8192;
|
|
modePos = 0;
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
//even if sound off, still update wav buffer
|
|
else if(reg >= 0x30 && reg < 0x40)
|
|
{
|
|
if(wavenable)
|
|
APU_IO_Reg[0x30+(wavCycle>>1)] = val;
|
|
else
|
|
APU_IO_Reg[reg] = val;
|
|
return;
|
|
}
|
|
//dont even bother with the switch if sound is off
|
|
else if(!soundEnabled)
|
|
return;
|
|
bool p1prevhaltloop, p2prevhaltloop,
|
|
wavprevhaltloop, noiseprevhaltloop;
|
|
APU_IO_Reg[reg] = val;
|
|
switch(reg)
|
|
{
|
|
case 0x10:
|
|
//printf("P1 sweep %02x\n", val);
|
|
p1Sweep.shift = val&7;
|
|
p1Sweep.period = (val>>4)&7;
|
|
p1Sweep.negative = ((val&0x8) != 0);
|
|
if(p1Sweep.inNegative && !p1Sweep.negative)
|
|
p1enable = false;
|
|
break;
|
|
case 0x11:
|
|
p1seq = pulseSeqs[val>>6];
|
|
p1LengthCtr = 64-(val&0x3F);
|
|
break;
|
|
case 0x12:
|
|
p1Env.vol = (val>>4)&0xF;
|
|
p1Env.curVol = p1Env.vol;
|
|
p1Env.modeadd = (val&8)!=0;
|
|
p1dacenable = (p1Env.modeadd || p1Env.vol);
|
|
if(!p1dacenable)
|
|
p1enable = false;
|
|
p1Env.period = val&7;
|
|
break;
|
|
case 0x13:
|
|
freq1 = ((freq1&~0xFF) | val);
|
|
break;
|
|
case 0x14:
|
|
p1prevhaltloop = p1haltloop;
|
|
p1haltloop = ((val&(1<<6)) == 0);
|
|
freq1 = (freq1&0xFF) | ((val&7)<<8);
|
|
//if length was previously frozen and we are in
|
|
//an odd frame sequence, clock length right now
|
|
if(p1prevhaltloop && !p1haltloop && p1LengthCtr && (modePos&1))
|
|
{
|
|
p1LengthCtr--;
|
|
//disable channel immediately if length
|
|
//reached 0 from this extra clock
|
|
if(p1LengthCtr == 0)
|
|
p1enable = false;
|
|
}
|
|
if(val&(1<<7))
|
|
{
|
|
if(p1dacenable)
|
|
p1enable = true;
|
|
if(p1LengthCtr == 0)
|
|
{
|
|
p1LengthCtr = 64;
|
|
//if length enabled and we are in an odd frame
|
|
//sequence, subtract one from newly set clock length
|
|
if(!p1haltloop && (modePos&1))
|
|
p1LengthCtr--;
|
|
}
|
|
//trigger reloads frequency timers
|
|
p1Cycle = 0;
|
|
if(freq1)
|
|
p1freqCtr = (2048-freq1)*4;
|
|
//trigger resets env volume
|
|
p1Env.curVol = p1Env.vol;
|
|
//period 0 is actually period 8!
|
|
p1Env.divider = (p1Env.period-1)&7;
|
|
//trigger used to enable/disable sweep
|
|
if(p1Sweep.period || p1Sweep.shift)
|
|
p1Sweep.enabled = true;
|
|
else
|
|
p1Sweep.enabled = false;
|
|
//trigger also resets divider, neg mode and frequency
|
|
p1Sweep.inNegative = false;
|
|
p1Sweep.pfreq = freq1;
|
|
//period 0 is actually period 8!
|
|
p1Sweep.divider = (p1Sweep.period-1)&7;
|
|
//if sweep shift>0, pre-calc frequency
|
|
if(p1Sweep.shift)
|
|
sweepUpdateFreq(&p1Sweep, &freq1, false);
|
|
}
|
|
//printf("P1 new freq %04x\n", freq1);
|
|
break;
|
|
case 0x16:
|
|
p2seq = pulseSeqs[val>>6];
|
|
p2LengthCtr = 64-(val&0x3F);
|
|
break;
|
|
case 0x17:
|
|
p2Env.vol = (val>>4)&0xF;
|
|
p2Env.curVol = p2Env.vol;
|
|
p2Env.modeadd = (val&8)!=0;
|
|
p2dacenable = (p2Env.modeadd || p2Env.vol);
|
|
if(!p2dacenable)
|
|
p2enable = false;
|
|
p2Env.period = val&7;
|
|
break;
|
|
case 0x18:
|
|
freq2 = ((freq2&~0xFF) | val);
|
|
break;
|
|
case 0x19:
|
|
p2prevhaltloop = p2haltloop;
|
|
p2haltloop = ((val&(1<<6)) == 0);
|
|
freq2 = (freq2&0xFF) | ((val&7)<<8);
|
|
//if length was previously frozen and we are in
|
|
//an odd frame sequence, clock length right now
|
|
if(p2prevhaltloop && !p2haltloop && p2LengthCtr && (modePos&1))
|
|
{
|
|
p2LengthCtr--;
|
|
//disable channel immediately if length
|
|
//reached 0 from this extra clock
|
|
if(p2LengthCtr == 0)
|
|
p2enable = false;
|
|
}
|
|
if(val&(1<<7))
|
|
{
|
|
if(p2dacenable)
|
|
p2enable = true;
|
|
if(p2LengthCtr == 0)
|
|
{
|
|
p2LengthCtr = 64;
|
|
//if length enabled and we are in an odd frame
|
|
//sequence, subtract one from newly set clock length
|
|
if(!p2haltloop && (modePos&1))
|
|
p2LengthCtr--;
|
|
}
|
|
//trigger reloads frequency timers
|
|
p2Cycle = 0;
|
|
if(freq2)
|
|
p2freqCtr = (2048-freq2)*4;
|
|
//trigger resets env volume
|
|
p2Env.curVol = p2Env.vol;
|
|
//period 0 is actually period 8!
|
|
p2Env.divider = (p2Env.period-1)&7;
|
|
}
|
|
//printf("P2 new freq %04x\n", freq2);
|
|
break;
|
|
case 0x1A:
|
|
wavdacenable = ((val&0x80)!=0);
|
|
if(!wavdacenable)
|
|
wavenable = false;
|
|
break;
|
|
case 0x1B:
|
|
wavLengthCtr = 256-val;
|
|
break;
|
|
case 0x1C:
|
|
//printf("wavVolShift %i\n", (val>>5)&3);
|
|
switch((val>>5)&3)
|
|
{
|
|
case 0:
|
|
wavVolShift=4;
|
|
break;
|
|
case 1:
|
|
wavVolShift=0;
|
|
break;
|
|
case 2:
|
|
wavVolShift=1;
|
|
break;
|
|
case 3:
|
|
wavVolShift=2;
|
|
break;
|
|
}
|
|
break;
|
|
case 0x1D:
|
|
//printf("wav time low %02x\n", val);
|
|
wavFreq = ((wavFreq&~0xFF) | val);
|
|
break;
|
|
case 0x1E:
|
|
wavprevhaltloop = wavhaltloop;
|
|
wavhaltloop = ((val&(1<<6)) == 0);
|
|
wavFreq = (wavFreq&0xFF) | ((val&7)<<8);
|
|
//if length was previously frozen and we are in
|
|
//an odd frame sequence, clock length right now
|
|
if(wavprevhaltloop && !wavhaltloop && wavLengthCtr && (modePos&1))
|
|
{
|
|
wavLengthCtr--;
|
|
//disable channel immediately if length
|
|
//reached 0 from this extra clock
|
|
if(wavLengthCtr == 0)
|
|
wavenable = false;
|
|
}
|
|
if(val&(1<<7))
|
|
{
|
|
if(wavdacenable)
|
|
wavenable = true;
|
|
if(wavLengthCtr == 0)
|
|
{
|
|
wavLengthCtr = 256;
|
|
//if length enabled and we are in an odd frame
|
|
//sequence, subtract one from newly set clock length
|
|
if(!wavhaltloop && (modePos&1))
|
|
wavLengthCtr--;
|
|
}
|
|
//trigger reloads frequency timers
|
|
wavCycle = 0;
|
|
//not sure why +4 needed to sync initally,
|
|
//probably because of sample buffer byte
|
|
wavFreqCtr = ((2048-wavFreq)*2)+4;
|
|
}
|
|
//printf("wav new freq %04x\n", wavFreq);
|
|
break;
|
|
case 0x20:
|
|
noiseLengthCtr = 64-(val&0x3F);
|
|
break;
|
|
case 0x21:
|
|
noiseEnv.vol = (val>>4)&0xF;
|
|
noiseEnv.curVol = noiseEnv.vol;
|
|
noiseEnv.modeadd = (val&8)!=0;
|
|
noisedacenable = (noiseEnv.modeadd || noiseEnv.vol);
|
|
if(!noisedacenable)
|
|
noiseenable = false;
|
|
noiseEnv.period=val&7;
|
|
break;
|
|
case 0x22:
|
|
if((val>>4)<14)
|
|
noiseFreq = noisePeriod[val&0x7]<<(val>>4);
|
|
else
|
|
noiseFreq = 0;
|
|
noiseMode1 = ((val&0x8) != 0);
|
|
break;
|
|
case 0x23:
|
|
noiseprevhaltloop = noisehaltloop;
|
|
noisehaltloop = ((val&(1<<6)) == 0);
|
|
//if length was previously frozen and we are in
|
|
//an odd frame sequence, clock length right now
|
|
if(noiseprevhaltloop && !noisehaltloop && noiseLengthCtr && (modePos&1))
|
|
{
|
|
noiseLengthCtr--;
|
|
//disable channel immediately if length
|
|
//reached 0 from this extra clock
|
|
if(noiseLengthCtr == 0)
|
|
noiseenable = false;
|
|
}
|
|
if(val&(1<<7))
|
|
{
|
|
if(noisedacenable)
|
|
noiseenable = true;
|
|
if(noiseLengthCtr == 0)
|
|
{
|
|
noiseLengthCtr = 64;
|
|
//if length enabled and we are in an odd frame
|
|
//sequence, subtract one from newly set clock length
|
|
if(!noisehaltloop && (modePos&1))
|
|
noiseLengthCtr--;
|
|
}
|
|
//trigger reloads frequency timers
|
|
noiseFreqCtr = noiseFreq;
|
|
//trigger resets env volume
|
|
noiseEnv.curVol = noiseEnv.vol;
|
|
//period 0 is actually period 8!
|
|
noiseEnv.divider = (noiseEnv.period-1)&7;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
//write-only bits are always set on reads by the cpu
|
|
static const uint8_t apuReadMask[0x20] =
|
|
{
|
|
0x80, 0x3F, 0x00, 0xFF, 0xBF, 0xFF, 0x3F, 0x00, 0xFF, 0xBF, 0x7F, 0xFF, 0x9F, 0xFF, 0xBF, 0xFF,
|
|
0xFF, 0x00, 0x00, 0xBF, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
};
|
|
|
|
uint8_t apuGetReg8(uint16_t addr)
|
|
{
|
|
uint8_t reg = addr&0xFF;
|
|
//printf("APU get %02x\n", reg);
|
|
switch(reg)
|
|
{
|
|
case 0x10: case 0x11: case 0x12: case 0x13: case 0x14: case 0x15: case 0x16: case 0x17:
|
|
case 0x18: case 0x19: case 0x1A: case 0x1B: case 0x1C: case 0x1D: case 0x1E: case 0x1F:
|
|
case 0x20: case 0x21: case 0x22: case 0x23: case 0x24: case 0x25: /*case 0x26:*/ case 0x27:
|
|
case 0x28: case 0x29: case 0x2A: case 0x2B: case 0x2C: case 0x2D: case 0x2E: case 0x2F:
|
|
return APU_IO_Reg[reg]|apuReadMask[reg-0x10];
|
|
case 0x26:
|
|
return soundEnabled?((p1enable) | ((p2enable)<<1) | ((wavenable)<<2) | ((noiseenable)<<3)|0xF0):0x70;
|
|
case 0x30: case 0x31: case 0x32: case 0x33: case 0x34: case 0x35: case 0x36: case 0x37:
|
|
case 0x38: case 0x39: case 0x3A: case 0x3B: case 0x3C: case 0x3D: case 0x3E: case 0x3F:
|
|
if(wavenable)
|
|
return APU_IO_Reg[0x30+(wavCycle>>1)];
|
|
return APU_IO_Reg[reg];
|
|
default:
|
|
break;
|
|
}
|
|
return 0xFF;
|
|
}
|
|
|
|
uint8_t *apuGetBuf()
|
|
{
|
|
return (uint8_t*)apuOutBuf;
|
|
}
|
|
|
|
uint32_t apuGetBufSize()
|
|
{
|
|
return apuBufSizeBytes;
|
|
}
|
|
|
|
uint32_t apuGetFrequency()
|
|
{
|
|
return apuFrequency;
|
|
}
|