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fix that bug where NSMB's backgrounds lagged one frame behind

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This commit is contained in:
StapleButter 2017-03-21 02:11:49 +01:00
parent 08a634371a
commit cc86aa57ae
3 changed files with 13 additions and 2 deletions
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6
src/GPU.cpp
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@ -692,6 +692,12 @@ void StartScanline(u32 line)
// (TODO, eventually: emulate it properly)
NDS::CheckDMAs(0, 0x04);
if (line == 0)
{
GPU2D_A->VBlankEnd();
GPU2D_B->VBlankEnd();
}
// draw
GPU2D_A->DrawScanline(line);
GPU2D_B->DrawScanline(line);

8
src/GPU2D.cpp
View File

@ -426,12 +426,16 @@ void GPU2D::DrawScanline(u32 line)
void GPU2D::VBlank()
{
CaptureCnt &= ~(1<<31);
}
void GPU2D::VBlankEnd()
{
// TODO: find out the exact time this happens
BGXRefInternal[0] = BGXRef[0];
BGXRefInternal[1] = BGXRef[1];
BGYRefInternal[0] = BGYRef[0];
BGYRefInternal[1] = BGYRef[1];
CaptureCnt &= ~(1<<31);
}

1
src/GPU2D.h
View File

@ -38,6 +38,7 @@ public:
void DrawScanline(u32 line);
void VBlank();
void VBlankEnd();
void BGExtPalDirty(u32 base);
void OBJExtPalDirty();