mirror of
https://github.com/ekeeke/Genesis-Plus-GX.git
synced 2024-12-27 03:31:49 +01:00
fixed Savestates
reverted SN76489 core changes (problem with Sonic 2 first level music, more investigations needed)
This commit is contained in:
ekeeke31
parent
acdfb2dbee
commit
e0737ff395
@ -6,7 +6,6 @@ Genesis Plus GX 1.4.0 (??/??/????) (Eke-Eke)
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------
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* modified SN76489 cut-off frequency
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* implemented optimized SN76489 core which uses Blip Buffer linear synthesis (Noise Channel is now linear interpolated) (credits to Blargg)
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* added an option to boost SN76489 Noise Channel
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* removed outdated Gens YM2612 core
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* improved YM2612 core general accuracy (SSG-EG, CSM mode,...) (based upon Nemesis recent tests on real MD)
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@ -21,7 +21,7 @@
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25/04/07 Eke-Eke (Genesis Plus GX)
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- Removed stereo GG support (unused)
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- Rade SN76489_Update outputs 16bits mono samples
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- Made SN76489_Update outputs 16bits mono samples
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- Replaced volume table with VGM plugin's one
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05/01/09 Eke-Eke (Genesis Plus GX)
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@ -29,28 +29,82 @@
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25/05/09 Eke-Eke (Genesis Plus GX)
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- Removed multichip support (unused)
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- Removed alternate volume table, panning & mute support (unused)
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- Removed configurable Feedback and Shift Register Width (always use Sega ones)
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- Added linear resampling using Blip Buffer (Blargg's implementation: http://www.smspower.org/forums/viewtopic.php?t=11376)
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*/
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#include "shared.h"
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#include "blip.h"
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#include <float.h>
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/* Initial state of shift register */
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#define NoiseInitialState 0x8000
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#include <float.h> // for FLT_MIN
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#include <string.h> // for memcpy
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/* Value below which PSG does not output */
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/*#define PSG_CUTOFF 0x6*/
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#define NoiseInitialState 0x8000 /* Initial state of shift register */
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//#define PSG_CUTOFF 0x6 /* Value below which PSG does not output */
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#define PSG_CUTOFF 0x1
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static const int PSGVolumeValues[16] =
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/*
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More testing is needed to find and confirm feedback patterns for
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SN76489 variants and compatible chips.
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*/
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enum feedback_patterns {
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FB_BBCMICRO = 0x8005, /* Texas Instruments TMS SN76489N (original) from BBC Micro computer */
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FB_SC3000 = 0x0006, /* Texas Instruments TMS SN76489AN (rev. A) from SC-3000H computer */
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FB_SEGAVDP = 0x0009, /* SN76489 clone in Sega's VDP chips (315-5124, 315-5246, 315-5313, Game Gear) */
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};
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enum sr_widths {
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SRW_SC3000BBCMICRO = 15,
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SRW_SEGAVDP = 16
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};
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enum volume_modes {
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VOL_TRUNC = 0, /* Volume levels 13-15 are identical */
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VOL_FULL = 1, /* Volume levels 13-15 are unique */
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};
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enum mute_values {
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MUTE_ALLOFF = 0, /* All channels muted */
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MUTE_TONE1 = 1, /* Tone 1 mute control */
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MUTE_TONE2 = 2, /* Tone 2 mute control */
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MUTE_TONE3 = 4, /* Tone 3 mute control */
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MUTE_NOISE = 8, /* Noise mute control */
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MUTE_ALLON = 15, /* All channels enabled */
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};
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typedef struct
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{
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int Mute; // per-channel muting
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int VolumeArray;
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int BoostNoise; // double noise volume when non-zero
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/* Variables */
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float Clock;
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float dClock;
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int PSGStereo;
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int NumClocksForSample;
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int WhiteNoiseFeedback;
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int SRWidth;
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/* PSG registers: */
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int Registers[8]; /* Tone, vol x4 */
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int LatchedRegister;
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int NoiseShiftRegister;
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int NoiseFreq; /* Noise channel signal generator frequency */
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/* Output calculation variables */
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int ToneFreqVals[4]; /* Frequency register values (counters) */
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int ToneFreqPos[4]; /* Frequency channel flip-flops */
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int Channels[4]; /* Value of each channel, before stereo is applied */
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float IntermediatePos[4]; /* intermediate values used at boundaries between + and - (does not need double accuracy)*/
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int panning[4]; /* fake stereo - 0..127..254 */
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} SN76489_Context;
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static const int PSGVolumeValues[2][16] = {
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/* These values are taken from a real SMS2's output */
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/*{892,892,892,760,623,497,404,323,257,198,159,123,96,75,60,0}, *//* I can't remember why 892... :P some scaling I did at some point */
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{892,892,892,760,623,497,404,323,257,198,159,123,96,75,60,0}, /* I can't remember why 892... :P some scaling I did at some point */
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/* these values are true volumes for 2dB drops at each step (multiply previous by 10^-0.1), normalised at 760 */
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1516,1205,957,760,603,479,381,303,240,191,152,120,96,76,60,0
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{1516,1205,957,760,603,479,381,303,240,191,152,120,96,76,60,0}
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};
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static SN76489_Context SN76489;
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@ -58,20 +112,18 @@ static SN76489_Context SN76489;
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void SN76489_Init(int PSGClockValue, int SamplingRate)
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{
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SN76489_Context *p = &SN76489;
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/* SamplingRate*16 instead of PSGClockValue/16 since division would lose some
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precision. blip_alloc doesn't care about the absolute sampling rate, just the
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ratio to clock rate. */
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p->blip_buffer = blip_alloc(PSGClockValue, SamplingRate * 16, SamplingRate / 4);
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p->dClock=(float)PSGClockValue/16/SamplingRate;
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SN76489_Config(MUTE_ALLON, VOL_FULL, FB_SEGAVDP, SRW_SEGAVDP, config.psgBoostNoise);
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SN76489_Reset();
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}
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void SN76489_Reset()
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void SN76489_Reset(void)
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{
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SN76489_Context *p = &SN76489;
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int i;
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p->PSGStereo = 0xFF;
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for(i = 0; i <= 3; i++)
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{
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/* Initialise PSG state */
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@ -85,8 +137,11 @@ void SN76489_Reset()
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/* Set flip-flops to 1 */
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p->ToneFreqPos[i] = 1;
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/* Clear current amplitudes in Blip delta buffer */
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p->chan_amp[i] = 0;
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/* Set intermediate positions to do-not-use value */
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p->IntermediatePos[i] = FLT_MIN;
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/* Set panning to centre */
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p->panning[0]=127;
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}
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p->LatchedRegister=0;
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@ -94,15 +149,29 @@ void SN76489_Reset()
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/* Initialise noise generator */
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p->NoiseShiftRegister=NoiseInitialState;
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/* Clear Blip delta buffer */
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if (p->blip_buffer) blip_clear(p->blip_buffer);
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/* Zero clock */
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p->Clock=0;
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}
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void SN76489_Shutdown(void)
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{
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}
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void SN76489_BoostNoise(int boost)
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{
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SN76489.BoostNoise = boost;
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}
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void SN76489_Config(int mute, int volume, int feedback, int sr_width, int boost_noise)
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{
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SN76489_Context *p = &SN76489;
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if (p->blip_buffer) blip_free(p->blip_buffer);
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p->blip_buffer = NULL;
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p->Mute = mute;
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p->VolumeArray = volume;
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p->WhiteNoiseFeedback = feedback;
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p->SRWidth = sr_width;
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p->BoostNoise = boost_noise;
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}
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void SN76489_SetContext(uint8 *data)
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@ -129,36 +198,29 @@ void SN76489_Write(int data)
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{
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SN76489_Context *p = &SN76489;
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if (data&0x80)
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{
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if (data&0x80) {
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/* Latch/data byte %1 cc t dddd */
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p->LatchedRegister=((data>>4)&0x07);
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p->Registers[p->LatchedRegister] =
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(p->Registers[p->LatchedRegister] & 0x3f0) | /* zero low 4 bits */
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(data&0xf); /* and replace with data */
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}
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else
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{
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p->Registers[p->LatchedRegister]=
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(p->Registers[p->LatchedRegister] & 0x3f0) /* zero low 4 bits */
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| (data&0xf); /* and replace with data */
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} else {
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/* Data byte %0 - dddddd */
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if (!(p->LatchedRegister%2)&&(p->LatchedRegister<5))
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/* Tone register */
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p->Registers[p->LatchedRegister]=
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(p->Registers[p->LatchedRegister] & 0x00f) | /* zero high 6 bits */
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((data&0x3f)<<4); /* and replace with data */
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(p->Registers[p->LatchedRegister] & 0x00f) /* zero high 6 bits */
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| ((data&0x3f)<<4); /* and replace with data */
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else
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/* Other register */
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p->Registers[p->LatchedRegister]=data&0x0f; /* Replace with data */
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}
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switch (p->LatchedRegister)
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{
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switch (p->LatchedRegister) {
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case 0:
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case 2:
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case 4: /* Tone channels */
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/* Zero frequency changed to 1 to avoid div/0 */
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if (p->Registers[p->LatchedRegister]==0) p->Registers[p->LatchedRegister]=1;
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if (p->Registers[p->LatchedRegister]==0) p->Registers[p->LatchedRegister]=1; /* Zero frequency changed to 1 to avoid div/0 */
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break;
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case 6: /* Noise */
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p->NoiseShiftRegister=NoiseInitialState; /* reset shift register */
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p->NoiseFreq=0x10<<(p->Registers[6]&0x3); /* set noise signal generator frequency */
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@ -166,146 +228,136 @@ void SN76489_Write(int data)
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}
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}
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/* Updates channel amplitude in delta buffer. Call whenever amplitude might have changed. */
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static inline void UpdateChanAmplitude(SN76489_Context* chip, int i, int time)
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void SN76489_GGStereoWrite(int data)
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{
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/* Build stereo result into buffer */
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int buffer = chip->Channels[i];
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/* Update amplitudes in left and right buffers */
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int delta = buffer - chip->chan_amp[i];
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if (delta != 0)
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{
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chip->chan_amp[i] = buffer;
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blip_add(chip->blip_buffer, time, delta);
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}
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}
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/* Updates tone amplitude in delta buffer. Call whenever amplitude might have changed. */
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static inline void UpdateToneAmplitude(SN76489_Context* chip, int i, int time)
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{
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/* Tone channels */
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chip->Channels[i]= PSGVolumeValues[chip->Registers[2 * i + 1]] * chip->ToneFreqPos[i];
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UpdateChanAmplitude(chip, i, time);
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}
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/* Updates noise amplitude in delta buffer. Call whenever amplitude might have changed. */
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static inline void UpdateNoiseAmplitude(SN76489_Context* chip, int time)
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{
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/* Noise channel */
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chip->Channels[3] = PSGVolumeValues[chip->Registers[7]] * ( chip->NoiseShiftRegister & 0x1 );
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/* Boost noise volume */
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chip->Channels[3] <<= chip->BoostNoise;
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UpdateChanAmplitude(chip, 3, time);
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}
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/* Runs tone channel for clock_length clocks */
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static inline void RunTone(SN76489_Context* chip, int i, int clock_length)
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{
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int time;
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/* Update in case a register changed etc. */
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UpdateToneAmplitude(chip, i, 0);
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/* Time of next transition */
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time = chip->ToneFreqVals[i];
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/* Process any transitions that occur within clocks we're running */
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while (time < clock_length)
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{
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if (chip->Registers[i*2]>PSG_CUTOFF) {
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/* Flip the flip-flop */
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chip->ToneFreqPos[i] = -chip->ToneFreqPos[i];
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} else {
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/* stuck value */
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chip->ToneFreqPos[i] = 1;
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}
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UpdateToneAmplitude(chip, i, time);
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/* Advance to time of next transition */
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time += chip->Registers[i*2] + 1;
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}
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/* Calculate new value for register, now that next transition is past number of clocks we're running */
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chip->ToneFreqVals[i] = time - clock_length;
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}
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/* Runs noise channel for clock_length clocks */
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static inline void RunNoise(SN76489_Context* chip, int clock_length)
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{
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int time;
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/* Noise channel: match to tone2 if in slave mode */
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int NoiseFreq = chip->NoiseFreq;
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if (NoiseFreq == 0x80)
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{
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NoiseFreq = chip->Registers[2*2];
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chip->ToneFreqVals[3] = chip->ToneFreqVals[2];
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}
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/* Update in case a register changed etc. */
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UpdateNoiseAmplitude(chip, 0);
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/* Time of next transition */
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time = chip->ToneFreqVals[3];
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/* Process any transitions that occur within clocks we're running */
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while ( time < clock_length )
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{
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/* Flip the flip-flop */
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chip->ToneFreqPos[3] = -chip->ToneFreqPos[3];
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if (chip->ToneFreqPos[3] == 1) {
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/* On the positive edge of the square wave (only once per cycle) */
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int Feedback;
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if ( chip->Registers[6] & 0x4 ) {
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/* White noise */
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/* Calculate parity of fed-back bits for feedback */
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/* Do some optimised calculations for common (known) feedback values */
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/* If two bits fed back, I can do Feedback=(nsr & fb) && (nsr & fb ^ fb) */
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/* since that's (one or more bits set) && (not all bits set) */
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Feedback = ( ( chip->NoiseShiftRegister & FB_SEGAVDP)
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&& ( (chip->NoiseShiftRegister & FB_SEGAVDP) ^ FB_SEGAVDP) );
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} else /* Periodic noise */
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Feedback=chip->NoiseShiftRegister&1;
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chip->NoiseShiftRegister=(chip->NoiseShiftRegister>>1) | (Feedback << (SRW_SEGAVDP-1));
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UpdateNoiseAmplitude(chip, time);
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}
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/* Advance to time of next transition */
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time += NoiseFreq + 1;
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}
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/* Calculate new value for register, now that next transition is past number of clocks we're running */
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chip->ToneFreqVals[3] = time - clock_length;
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SN76489_Context *p = &SN76489;
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p->PSGStereo=data;
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}
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void SN76489_Update(INT16 *buffer, int length)
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{
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int i;
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SN76489_Context *p = &SN76489;
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int i, j;
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/* Determine how many clocks we need to run until 'length' samples are available */
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int clock_length = blip_clocks_needed(p->blip_buffer, length);
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for(j = 0; j < length; j++)
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{
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for (i=0;i<=2;++i)
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if (p->IntermediatePos[i]!=FLT_MIN)
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p->Channels[i]=(short)((p->Mute >> i & 0x1)*PSGVolumeValues[p->VolumeArray][p->Registers[2*i+1]]*p->IntermediatePos[i]);
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else
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p->Channels[i]=(p->Mute >> i & 0x1)*PSGVolumeValues[p->VolumeArray][p->Registers[2*i+1]]*p->ToneFreqPos[i];
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/* Run noise first, since it might use current value of third tone frequency counter */
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RunNoise(p, clock_length);
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p->Channels[3]=(short)((p->Mute >> 3 & 0x1)*PSGVolumeValues[p->VolumeArray][p->Registers[7]]*(p->NoiseShiftRegister & 0x1));
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/* Run tone channels */
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for( i = 0; i <= 2; ++i )
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RunTone(p, i, clock_length);
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if (p->BoostNoise) p->Channels[3]<<=1; /* double noise volume */
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/* Read samples into output buffer */
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blip_end_frame(p->blip_buffer,clock_length);
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blip_read_samples(p->blip_buffer,buffer,length,0);
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buffer[j] =0;
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for (i=0;i<=3;++i) buffer[j] += p->Channels[i];
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p->Clock+=p->dClock;
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p->NumClocksForSample=(int)p->Clock; /* truncates */
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p->Clock-=p->NumClocksForSample; /* remove integer part */
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/* Looks nicer in Delphi... */
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/* Clock:=Clock+p->dClock; */
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/* NumClocksForSample:=Trunc(Clock); */
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/* Clock:=Frac(Clock); */
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/* Decrement tone channel counters */
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for (i=0;i<=2;++i)
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p->ToneFreqVals[i]-=p->NumClocksForSample;
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/* Noise channel: match to tone2 or decrement its counter */
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if (p->NoiseFreq==0x80) p->ToneFreqVals[3]=p->ToneFreqVals[2];
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else p->ToneFreqVals[3]-=p->NumClocksForSample;
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/* Tone channels: */
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for (i=0;i<=2;++i) {
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if (p->ToneFreqVals[i]<=0) { /* If it gets below 0... */
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if (p->Registers[i*2]>PSG_CUTOFF) {
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/* Calculate how much of the sample is + and how much is - */
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/* Go to floating point and include the clock fraction for extreme accuracy :D */
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/* Store as long int, maybe it's faster? I'm not very good at this */
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p->IntermediatePos[i]=(p->NumClocksForSample-p->Clock+2*p->ToneFreqVals[i])*p->ToneFreqPos[i]/(p->NumClocksForSample+p->Clock);
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p->ToneFreqPos[i]=-p->ToneFreqPos[i]; /* Flip the flip-flop */
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} else {
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p->ToneFreqPos[i]=1; /* stuck value */
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p->IntermediatePos[i]=FLT_MIN;
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}
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p->ToneFreqVals[i]+=p->Registers[i*2]*(p->NumClocksForSample/p->Registers[i*2]+1);
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} else p->IntermediatePos[i]=FLT_MIN;
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}
|
||||
|
||||
/* Noise channel */
|
||||
if (p->ToneFreqVals[3]<=0) { /* If it gets below 0... */
|
||||
p->ToneFreqPos[3]=-p->ToneFreqPos[3]; /* Flip the flip-flop */
|
||||
if (p->NoiseFreq!=0x80) /* If not matching tone2, decrement counter */
|
||||
p->ToneFreqVals[3]+=p->NoiseFreq*(p->NumClocksForSample/p->NoiseFreq+1);
|
||||
if (p->ToneFreqPos[3]==1) { /* Only once per cycle... */
|
||||
int Feedback;
|
||||
if (p->Registers[6]&0x4) { /* White noise */
|
||||
/* Calculate parity of fed-back bits for feedback */
|
||||
switch (p->WhiteNoiseFeedback) {
|
||||
/* Do some optimised calculations for common (known) feedback values */
|
||||
case 0x0003: /* SC-3000, BBC %00000011 */
|
||||
case 0x0009: /* SMS, GG, MD %00001001 */
|
||||
/* If two bits fed back, I can do Feedback=(nsr & fb) && (nsr & fb ^ fb) */
|
||||
/* since that's (one or more bits set) && (not all bits set) */
|
||||
Feedback=((p->NoiseShiftRegister&p->WhiteNoiseFeedback) && ((p->NoiseShiftRegister&p->WhiteNoiseFeedback)^p->WhiteNoiseFeedback));
|
||||
break;
|
||||
default: /* Default handler for all other feedback values */
|
||||
Feedback=p->NoiseShiftRegister&p->WhiteNoiseFeedback;
|
||||
Feedback^=Feedback>>8;
|
||||
Feedback^=Feedback>>4;
|
||||
Feedback^=Feedback>>2;
|
||||
Feedback^=Feedback>>1;
|
||||
Feedback&=1;
|
||||
break;
|
||||
}
|
||||
} else /* Periodic noise */
|
||||
Feedback=p->NoiseShiftRegister&1;
|
||||
|
||||
p->NoiseShiftRegister=(p->NoiseShiftRegister>>1) | (Feedback << (p->SRWidth-1));
|
||||
|
||||
/* Original code: */
|
||||
/* p->NoiseShiftRegister=(p->NoiseShiftRegister>>1) | ((p->Registers[6]&0x4?((p->NoiseShiftRegister&0x9) && (p->NoiseShiftRegister&0x9^0x9)):p->NoiseShiftRegister&1)<<15); */
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void SN76489_BoostNoise(int boost)
|
||||
/*void SN76489_UpdateOne(int which, int *l, int *r)
|
||||
{
|
||||
SN76489.BoostNoise = boost;
|
||||
INT16 tl,tr;
|
||||
INT16 *buff[2]={&tl,&tr};
|
||||
SN76489_Update(which,buff,1);
|
||||
*l=tl;
|
||||
*r=tr;
|
||||
}*/
|
||||
|
||||
int SN76489_GetMute()
|
||||
{
|
||||
return SN76489.Mute;
|
||||
}
|
||||
|
||||
void SN76489_SetMute(int val)
|
||||
{
|
||||
SN76489.Mute=val;
|
||||
}
|
||||
|
||||
int SN76489_GetVolType()
|
||||
{
|
||||
return SN76489.VolumeArray;
|
||||
}
|
||||
|
||||
void SN76489_SetVolType(int val)
|
||||
{
|
||||
SN76489.VolumeArray=val;
|
||||
}
|
||||
|
||||
void SN76489_SetPanning(int ch0, int ch1, int ch2, int ch3)
|
||||
{
|
||||
SN76489.panning[0]=ch0;
|
||||
SN76489.panning[1]=ch1;
|
||||
SN76489.panning[2]=ch2;
|
||||
SN76489.panning[3]=ch3;
|
||||
}
|
||||
|
||||
@ -37,32 +37,6 @@
|
||||
#ifndef _SN76489_H_
|
||||
#define _SN76489_H_
|
||||
|
||||
/* SN76489 clone in Sega's VDP chips (315-5124, 315-5246, 315-5313, Game Gear) */
|
||||
#define FB_SEGAVDP 0x0009
|
||||
#define SRW_SEGAVDP 16
|
||||
|
||||
typedef struct
|
||||
{
|
||||
/* Configuration */
|
||||
int BoostNoise; // double noise volume when non-zero
|
||||
|
||||
/* PSG registers: */
|
||||
int Registers[8]; /* Tone, vol x4 */
|
||||
int LatchedRegister;
|
||||
int NoiseShiftRegister;
|
||||
int NoiseFreq; /* Noise channel signal generator frequency */
|
||||
|
||||
/* Output calculation variables */
|
||||
int ToneFreqVals[4]; /* Frequency register values (counters) */
|
||||
int ToneFreqPos[4]; /* Frequency channel flip-flops */
|
||||
int Channels[4]; /* Value of each channel, before stereo is applied */
|
||||
|
||||
/* Blip-Buffer variables */
|
||||
struct blip_buffer_t* blip_buffer; /* delta resampler */
|
||||
int chan_amp[4]; /* current channel amplitudes in delta buffers */
|
||||
|
||||
} SN76489_Context;
|
||||
|
||||
/* Function prototypes */
|
||||
extern void SN76489_Init(int PSGClockValue, int SamplingRate);
|
||||
extern void SN76489_Reset(void);
|
||||
@ -74,6 +48,7 @@ extern int SN76489_GetContextSize(void);
|
||||
extern void SN76489_Write(int data);
|
||||
extern void SN76489_Update(INT16 *buffer, int length);
|
||||
extern void SN76489_BoostNoise(int boost);
|
||||
extern void SN76489_Config(int mute, int volume, int feedback, int sr_width, int boost_noise);
|
||||
|
||||
#endif /* _SN76489_H_ */
|
||||
|
||||
|
||||
@ -24,7 +24,7 @@
|
||||
#define _STATE_H_
|
||||
|
||||
#define STATE_SIZE 0x28000
|
||||
#define STATE_VERSION "GENPLUS-GX 1.3.2"
|
||||
#define STATE_VERSION "GENPLUS-GX 1.4.0"
|
||||
|
||||
/* Function prototypes */
|
||||
extern int state_load(unsigned char *buffer);
|
||||
|
||||
@ -86,7 +86,7 @@ void audio_update (int size)
|
||||
for (i = 0; i < size; i ++)
|
||||
{
|
||||
/* PSG samples (mono) */
|
||||
l = r = (((int)*psg++) * psg_preamp)/100;
|
||||
l = r = ((*psg++) * psg_preamp)/100;
|
||||
|
||||
/* FM samples (stereo) */
|
||||
l += (*fm[0]++ * fm_preamp)/100;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user