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NES: Zapper: fix up the light detection formula a bit. the real thing is hopelessly dependent on a bazillion analog factors with wide environmental variability...

This commit is contained in:
goyuken 2014-04-16 21:04:07 +00:00
parent 75905e05a6
commit 53d3abb4f6
1 changed files with 16 additions and 7 deletions
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23
BizHawk.Emulation.Cores/Consoles/Nintendo/NES/PPU.cs
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@ -45,18 +45,27 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
// true = light sensed
public bool LightGunCallback(int x, int y)
{
// untested so far
// the actual light gun circuit is very complex
// and this doesn't do it justice at all, as expected
const int radius = 10; // look at pixel values up to this far away, roughly
int sum = 0;
int ymin = Math.Max(Math.Max(y - 30, ppur.status.sl - 20), 0);
int ymax = Math.Min(Math.Min(y + 30, ppur.status.sl + 2),239);
int xmin = Math.Max(0, x - 30);
int xmax = Math.Min(255, x + 30);
int ymin = Math.Max(Math.Max(y - radius, ppur.status.sl - 20), 0);
int ymax = Math.Min(y + radius, 239);
int xmin = Math.Max(x - radius, 0);
int xmax = Math.Min(x + radius, 255);
int ystop = ppur.status.sl - 2;
int xstop = ppur.status.cycle - 20;
for (int j = ymin; j <= ymax; j++)
{
for (int i = xmin; i <= xmax; i++)
{
if (j >= ystop && i >= xstop || j > ystop)
goto loopout;
short s = xbuf[j * 256 + i];
int lum = s & 0x30;
if ((s & 0x0f) >= 0x0e)
@ -64,8 +73,8 @@ namespace BizHawk.Emulation.Cores.Nintendo.NES
sum += lum;
}
}
// judging from Duck Hunt 3rd mode (skeet shooting), this is about correct
return sum >= 9001;
loopout:
return sum >= 2000;
}