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C219: fix VGM export 

a sample word has two 8-bit samples in reverse order
(need hardware confirmation)
This commit is contained in:
tildearrow 2023-08-29 04:09:11 -05:00
parent e7fe99f795
commit eaac5cc224
2 changed files with 7 additions and 6 deletions
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9
src/engine/platform/c140.cpp
View File

@ -573,6 +573,7 @@ void DivPlatformC140::renderSamples(int sysID) {
if ((memPos&0xfe0000)!=((memPos+length)&0xfe0000)) {
memPos=((memPos+0x1ffff)&0xfe0000);
}
logV("%d",length);
if (memPos>=(getSampleMemCapacity())) {
logW("out of C219 memory for sample %d!",i);
break;
@ -584,17 +585,17 @@ void DivPlatformC140::renderSamples(int sysID) {
if (s->depth==DIV_SAMPLE_DEPTH_C219) {
for (unsigned int i=0; i<length; i++) {
if (i>=s->lengthC219) {
sampleMem[i+memPos]=0;
sampleMem[(memPos+i)^1]=0;
} else {
sampleMem[i+memPos]=s->dataC219[i];
sampleMem[(memPos+i)^1]=s->dataC219[i];
}
}
} else {
for (unsigned int i=0; i<length; i++) {
if (i>=s->length8) {
sampleMem[memPos+i]=0;
sampleMem[(memPos+i)^1]=0;
} else {
sampleMem[memPos+i]=s->data8[i];
sampleMem[(memPos+i)^1]=s->data8[i];
}
}
}

4
src/engine/platform/sound/c140_c219.c
View File

@ -171,8 +171,8 @@ void c219_voice_tick(struct c219_t *c219, const unsigned char v, const int cycle
else
{
// fetch 8 bit sample
signed short s1 = c219->sample_mem[((unsigned int)(c219->bank[(v >> 2) & 3]) << 17) | voice->addr];
signed short s2 = c219->sample_mem[((unsigned int)(c219->bank[(v >> 2) & 3]) << 17) | ((voice->addr + 1) & 0x1ffff)];
signed short s1 = c219->sample_mem[((unsigned int)(c219->bank[(v >> 2) & 3]) << 17) | (voice->addr^1)];
signed short s2 = c219->sample_mem[((unsigned int)(c219->bank[(v >> 2) & 3]) << 17) | (((voice->addr + 1) & 0x1ffff)^1)];
if (voice->compressed)
{
s1 = c219->mulaw[s1&0xff];