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d_kinst: Better syncronization between MIPS and ADSP.

This commit is contained in:
Marcos Medeiros 2015-05-16 16:21:37 +00:00
parent a39176b2a3
commit 83c458b3c1
1 changed files with 50 additions and 13 deletions
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63
src/burn/drv/midway/d_kinst.cpp
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@ -465,27 +465,64 @@ static INT32 DrvFrame()
{
MakeInputs();
const long fps = 60;
const long vblankCycles = kHz(20) * fps;
const long cycles = (MHz(100) - vblankCycles) / fps ;
const long FPS = 60;
const long nMipsCycPerFrame = MHz(100) / FPS;
const long nMipsVblankCyc = nMipsCycPerFrame - kHz(20);
const long nDcsCycPerFrame = MHz(10) / FPS;
long nNextMipsSegment = 0;
long nNextDcsSegment = 0;
long nMipsTotalCyc = 0;
long nDcsTotalCyc = 0;
// mips 100MHz -> dcs 10MHz => 10:1
const long mQuantum = kHz(10);
const long dQuantum = kHz(1);
nNextMipsSegment = mQuantum;
nNextDcsSegment = dQuantum;
Mips3SetIRQLine(VBLANK_IRQ, 0);
Mips3Run(cycles);
if (pBurnDraw) {
DrvDraw();
bool isVblank = false;
while ((nMipsTotalCyc < nMipsCycPerFrame) || (nDcsTotalCyc < nDcsCycPerFrame))
{
if ((nNextMipsSegment + nMipsTotalCyc) > nMipsCycPerFrame)
nNextMipsSegment -= (nNextMipsSegment + nMipsTotalCyc) - nMipsCycPerFrame;
if ((nNextDcsSegment + nDcsTotalCyc) > nDcsCycPerFrame)
nNextDcsSegment -= (nNextDcsSegment + nDcsTotalCyc) - nDcsCycPerFrame;
if (!isVblank) {
if ((nNextMipsSegment + nMipsTotalCyc) >= nMipsVblankCyc) {
nNextMipsSegment -= (nNextMipsSegment + nMipsTotalCyc) - nMipsVblankCyc;
}
if (nMipsTotalCyc == nMipsVblankCyc) {
isVblank = true;
Mips3SetIRQLine(VBLANK_IRQ, 1);
if (pBurnDraw) {
DrvDraw();
}
}
}
if (nNextMipsSegment) {
Mips3Run(nNextMipsSegment);
nMipsTotalCyc += nNextMipsSegment;
}
if (nNextDcsSegment) {
Dcs2kRun(nNextDcsSegment);
nDcsTotalCyc += nNextDcsSegment;
}
nNextDcsSegment = dQuantum;
nNextMipsSegment = mQuantum;
}
Dcs2kRun(MHz(10) / 60);
if (pBurnSoundOut) {
Dcs2kRender(pBurnSoundOut, nBurnSoundLen);
}
Mips3SetIRQLine(VBLANK_IRQ, 1);
Mips3Run(kHz(20));
return 0;
}