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proper display FIFO emulation

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This commit is contained in:
StapleButter
2017-06-26 11:02:10 +02:00
parent 155609b6d9
commit 4afac28263
7 changed files with 105 additions and 34 deletions
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36
src/GPU2D.cpp
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@ -108,6 +108,10 @@ void GPU2D::Reset()
EVB = 0;
EVY = 0;
memset(DispFIFO, 0, 16*2);
DispFIFOReadPtr = 0;
DispFIFOWritePtr = 0;
memset(DispFIFOBuffer, 0, 256*2);
CaptureCnt = 0;
@ -328,6 +332,15 @@ void GPU2D::Write16(u32 addr, u16 val)
if (EVY > 16) EVY = 16;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val;
return;
case 0x06A:
DispFIFO[DispFIFOWritePtr+1] = val;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
case 0x06C: MasterBrightness = val; return;
}
@ -369,6 +382,13 @@ void GPU2D::Write32(u32 addr, u32 val)
// esp. if a capture is happening
CaptureCnt = val & 0xEF3F1F1F;
return;
case 0x068:
DispFIFO[DispFIFOWritePtr] = val & 0xFFFF;
DispFIFO[DispFIFOWritePtr+1] = val >> 16;
DispFIFOWritePtr += 2;
DispFIFOWritePtr &= 0xF;
return;
}
Write16(addr, val&0xFFFF);
@ -532,6 +552,9 @@ void GPU2D::DrawScanline(u32 line)
void GPU2D::VBlank()
{
CaptureCnt &= ~(1<<31);
DispFIFOReadPtr = 0;
DispFIFOWritePtr = 0;
}
void GPU2D::VBlankEnd()
@ -694,14 +717,15 @@ void GPU2D::DoCapture(u32 line, u32 width, u32* src)
}
}
void GPU2D::FIFODMA(u32 addr)
void GPU2D::SampleFIFO(u32 offset, u32 num)
{
for (int i = 0; i < 256; i += 2)
for (u32 i = 0; i < num; i++)
{
u32 val = NDS::ARM9Read32(addr);
addr += 4;
DispFIFOBuffer[i] = val & 0xFFFF;
DispFIFOBuffer[i+1] = val >> 16;
u16 val = DispFIFO[DispFIFOReadPtr];
DispFIFOReadPtr++;
DispFIFOReadPtr &= 0xF;
DispFIFOBuffer[offset+i] = val;
}
}