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ALIENJACK\alien 2024-07-29 09:25:19 +08:00
parent 69aa14ca67
commit d7846c7182
3 changed files with 83 additions and 0 deletions
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1
AxibugEmuOnline.Client/Assets/VirtualNes.Core/Mapper/Mapper.cs
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@ -78,6 +78,7 @@ namespace VirtualNes.Core
public static Mapper CreateMapper(NES parent, int no)
{
//todo : 实现加载mapper
switch (no)
{
default:

20
AxibugEmuOnline.Client/Assets/VirtualNes.Core/NES.cs
View File

@ -8,6 +8,8 @@ namespace VirtualNes.Core
{
public class NES
{
public const int FETCH_CYCLES = 8;
public CPU cpu;
public PPU ppu;
public APU apu;
@ -181,7 +183,25 @@ namespace VirtualNes.Core
if (RenderMethod < EnumRenderMethod.POST_RENDER)
{
EmulationCPU(nescfg.ScanlineCycles);
ppu.FrameStart();
ppu.ScanlineNext();
mapper.HSync(scanline);
ppu.ScanlineStart();
}
else
{
EmulationCPU(nescfg.HDrawCycles);
ppu.FrameStart();
ppu.ScanlineNext();
mapper.HSync(scanline);
EmulationCPU(FETCH_CYCLES * 32);
ppu.ScanlineStart();
EmulationCPU(FETCH_CYCLES * 10 + nescfg.ScanlineEndCycles);
}
}
else if (scanline < 240)
{
}
}
}

62
AxibugEmuOnline.Client/Assets/VirtualNes.Core/PPU.cs
View File

@ -363,6 +363,68 @@ namespace VirtualNes.Core
MemoryUtility.memset(lpColormode, 0, (int)(Screen.SCREEN_HEIGHT));
}
internal void FrameStart()
{
if ((MMU.PPUREG[1] & (PPU_SPDISP_BIT | PPU_BGDISP_BIT)) != 0)
{
MMU.loopy_v = MMU.loopy_t;
loopy_shift = MMU.loopy_x;
loopy_y = (ushort)((MMU.loopy_v & 0x7000) >> 12);
}
if (lpScreen != null)
{
MemoryUtility.memset(lpScreen, 0x3F, (int)Screen.SCREEN_WIDTH);
}
if (lpColormode != null)
{
lpColormode[0] = 0;
}
}
internal void ScanlineNext()
{
if ((MMU.PPUREG[1] & (PPU_BGDISP_BIT | PPU_SPDISP_BIT)) != 0)
{
if ((MMU.loopy_v & 0x7000) == 0x7000)
{
MMU.loopy_v &= 0x8FFF;
if ((MMU.loopy_v & 0x03E0) == 0x03A0)
{
MMU.loopy_v ^= 0x0800;
MMU.loopy_v &= 0xFC1F;
}
else
{
if ((MMU.loopy_v & 0x03E0) == 0x03E0)
{
MMU.loopy_v &= 0xFC1F;
}
else
{
MMU.loopy_v += 0x0020;
}
}
}
else
{
MMU.loopy_v += 0x1000;
}
loopy_y = (ushort)((MMU.loopy_v & 0x7000) >> 12);
}
}
internal void ScanlineStart()
{
if ((MMU.PPUREG[1] & (PPU_BGDISP_BIT | PPU_SPDISP_BIT)) != 0)
{
MMU.loopy_v = (ushort)((MMU.loopy_v & 0xFBE0) | (MMU.loopy_t & 0x041F));
loopy_shift = MMU.loopy_x;
loopy_y = (ushort)((MMU.loopy_v & 0x7000) >> 12);
nes.mapper.PPU_Latch((ushort)(0x2000 + (MMU.loopy_v & 0x0FFF)));
}
}
private enum Screen
{
SCREEN_WIDTH = 256 + 16,