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Burai Fighter/Zelda 2 PPU fix from upstream core

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This commit is contained in:
rdanbrook 2021-01-13 18:32:57 -05:00
parent 5b6157fe8d
commit 40bd75f672
1 changed files with 10 additions and 23 deletions
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33
source/core/NstPpu.cpp
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@ -659,27 +659,8 @@ namespace Nes
{
if ((scanline != SCANLINE_VBLANK ) && (regs.ctrl[1] & Regs::CTRL1_BG_SP_ENABLED))
{
if ( regs.ctrl[0] & Regs::CTRL0_INC32 )
{
if((scroll.address & 0x7000) == 0x7000)
{
scroll.address &= 0x0FFF;
switch(scroll.address & 0x03E0)
{
case 0x03A0: scroll.address ^= 0x0800; break;
case 0x03E0: scroll.address &= 0x7C1F; break;
default: scroll.address += 0x20;
}
}
else
{
scroll.address += 0x1000;
}
}
else
{
scroll.address++;
}
scroll.ClockX();
scroll.ClockY();
}
else
{
@ -956,7 +937,11 @@ namespace Nes
uint address = scroll.address;
UpdateVramAddress();
UpdateScrollAddressLine();
if (!(regs.ctrl[1] & Regs::CTRL1_BG_SP_ENABLED) || (scanline == SCANLINE_VBLANK))
UpdateAddressLine(scroll.address & 0x3fff);
else
return;
io.latch = data;
@ -994,7 +979,9 @@ namespace Nes
address = scroll.address & 0x3FFF;
UpdateVramAddress();
UpdateScrollAddressLine();
if (!(regs.ctrl[1] & Regs::CTRL1_BG_SP_ENABLED) || (scanline == SCANLINE_VBLANK))
UpdateAddressLine(scroll.address & 0x3fff);
io.latch = (address & 0x3F00) != 0x3F00 ? io.buffer : palette.ram[address & 0x1F] & Coloring();
io.buffer = (address >= 0x2000 ? nmt.FetchName( address ) : chr.FetchPattern( address ));