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d_kinst: Fix frame timing. Now running at perfect 60FPS.

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This commit is contained in:
Marcos Medeiros 2015-02-23 04:41:33 +00:00
parent 3131b359c4
commit b92382ce01
1 changed files with 18 additions and 6 deletions
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24
src/burn/drv/midway/d_kinst.cpp
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@ -190,7 +190,7 @@ static void MakeInputs()
if (DrvJoy1[i] & 1)
DrvInputs[0] |= (1 << i);
if (DrvJoy2[i] & 1)
DrvInputs[0] |= (1 << i);
DrvInputs[1] |= (1 << i);
}
}
@ -272,20 +272,32 @@ static INT32 DrvDraw()
return 0;
}
#define MHz(x) (x * 1000000)
#define kHz(x) (x * 1000)
// R4600: 100 MHz
// VIDEO: 60 Hz
// VBLANK: 20 kHz, 50us (from MAME))
// 50us = 20kHz
//
static INT32 DrvFrame()
{
MakeInputs();
Mips3SetIRQLine(VBLANK_IRQ, 0);
Mips3Run(1000000/4);
const long fps = 60;
const long vblankCycles = kHz(20) * fps;
const long cycles = (MHz(100) - vblankCycles) / fps ;
Mips3SetIRQLine(VBLANK_IRQ, 1);
Mips3Run(1000000/4);
Mips3SetIRQLine(VBLANK_IRQ, 0);
Mips3Run(cycles);
if (pBurnDraw) {
DrvDraw();
}
Mips3SetIRQLine(VBLANK_IRQ, 1);
Mips3Run(kHz(20));
return 0;
}