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Amiga: better emulation, part 1

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prepare to actually emulate DMA operation
eventually poke() and register view will work
This commit is contained in:
tildearrow 2023-03-09 17:46:45 -05:00
parent 0f08c6e702
commit c0b4cc0d63
4 changed files with 109 additions and 3 deletions
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62
src/engine/platform/amiga.cpp
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@ -20,6 +20,7 @@
#define _USE_MATH_DEFINES
#include "amiga.h"
#include "../engine.h"
#include "../../ta-log.h"
#include <math.h>
#define AMIGA_DIVIDER 8
@ -81,6 +82,10 @@ void DivPlatformAmiga::acquire(short** buf, size_t len) {
for (size_t h=0; h<len; h++) {
outL=0;
outR=0;
// NEW CODE
// OLD CODE
for (int i=0; i<4; i++) {
chan[i].volPos=(chan[i].volPos+1)&AMIGA_VPMASK;
if (!chan[i].active) {
@ -457,6 +462,9 @@ void DivPlatformAmiga::setFlags(const DivConfig& flags) {
sep1=sep+127;
sep2=127-sep;
amigaModel=flags.getInt("chipType",0);
chipMem=flags.getInt("chipMem",21);
if (chipMem<18) chipMem=18;
if (chipMem>21) chipMem=21;
bypassLimits=flags.getBool("bypassLimits",false);
if (amigaModel) {
filtConstOff=4000;
@ -467,6 +475,56 @@ void DivPlatformAmiga::setFlags(const DivConfig& flags) {
}
}
const void* DivPlatformAmiga::getSampleMem(int index) {
return index == 0 ? sampleMem : NULL;
}
size_t DivPlatformAmiga::getSampleMemCapacity(int index) {
return index == 0 ? (1<<chipMem) : 0;
}
size_t DivPlatformAmiga::getSampleMemUsage(int index) {
return index == 0 ? sampleMemLen : 0;
}
bool DivPlatformAmiga::isSampleLoaded(int index, int sample) {
if (index!=0) return false;
if (sample<0 || sample>255) return false;
return sampleLoaded[sample];
}
void DivPlatformAmiga::renderSamples(int sysID) {
memset(sampleMem,0,2097152);
memset(sampleOff,0,256*sizeof(unsigned int));
memset(sampleLoaded,0,256*sizeof(bool));
size_t memPos=0;
for (int i=0; i<parent->song.sampleLen; i++) {
DivSample* s=parent->song.sample[i];
if (!s->renderOn[0][sysID]) {
sampleOff[i]=0;
continue;
}
if (memPos>=getSampleMemCapacity()) {
logW("out of Amiga memory for sample %d!",i);
break;
}
int length=s->getLoopEndPosition(DIV_SAMPLE_DEPTH_8BIT);
int actualLength=MIN((int)(getSampleMemCapacity()-memPos),length);
if (actualLength>0) {
sampleOff[i]=memPos;
memcpy(&sampleMem[memPos],s->data8,actualLength);
memPos+=actualLength;
}
// align memPos to short
if (memPos&1) memPos++;
sampleLoaded[i]=true;
}
sampleMemLen=memPos;
}
int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
@ -487,12 +545,16 @@ int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, const DivCon
}
}
sampleMem=new unsigned char[2097152];
sampleMemLen=0;
setFlags(flags);
reset();
return 6;
}
void DivPlatformAmiga::quit() {
delete[] sampleMem;
for (int i=0; i<4; i++) {
delete oscBuf[i];
}