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PPU: Fixed glitches when games turn overscan + interlace on and back off mid-frame

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(Chrono Trigger does this for a couple of frames when a battle starts)
This commit is contained in:
Sour 2020-02-29 19:36:17 -05:00
parent 8798a73deb
commit dc6d295b1a
2 changed files with 19 additions and 13 deletions
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31
Core/Ppu.cpp
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@ -385,15 +385,16 @@ bool Ppu::ProcessEndOfScanline(uint16_t hClock)
RenderScanline();
if(_scanline == 0) {
_overscanFrame = _state.OverscanMode;
_mosaicScanlineCounter = _state.MosaicEnabled ? _state.MosaicSize + 1 : 0;
if(!_skipRender) {
if(!_interlacedFrame) {
_currentBuffer = _currentBuffer == _outputBuffers[0] ? _outputBuffers[1] : _outputBuffers[0];
}
//If we're not skipping this frame, reset the high resolution flag
_useHighResOutput = false;
_interlacedFrame = false;
//If we're not skipping this frame, reset the high resolution/interlace flags
_useHighResOutput = IsDoubleWidth() || _state.ScreenInterlace;
_interlacedFrame = _state.ScreenInterlace;
}
}
@ -1335,7 +1336,15 @@ void Ppu::ApplyBrightness()
void Ppu::ConvertToHiRes()
{
uint16_t scanline = _state.OverscanMode ? (_scanline - 1) : (_scanline + 6);
bool useHighResOutput = _useHighResOutput || IsDoubleWidth() || _state.ScreenInterlace;
if(!useHighResOutput || _useHighResOutput == useHighResOutput || _scanline >= _vblankStartScanline || _scanline == 0) {
return;
}
//Convert standard res picture to high resolution when the PPU starts drawing in high res mid frame
_useHighResOutput = useHighResOutput;
uint16_t scanline = _overscanFrame ? (_scanline - 1) : (_scanline + 6);
if(_drawStartX > 0) {
for(int x = 0; x < _drawStartX; x++) {
@ -1357,14 +1366,7 @@ void Ppu::ConvertToHiRes()
void Ppu::ApplyHiResMode()
{
//When overscan mode is off, center the 224-line picture in the center of the 239-line output buffer
uint16_t scanline = _state.OverscanMode ? (_scanline - 1) : (_scanline + 6);
bool useHighResOutput = _useHighResOutput || IsDoubleWidth() || _state.ScreenInterlace;
if(_useHighResOutput != useHighResOutput) {
//Convert standard res picture to high resolution when the PPU starts drawing in high res mid frame
ConvertToHiRes();
_useHighResOutput = useHighResOutput;
}
uint16_t scanline = _overscanFrame ? (_scanline - 1) : (_scanline + 6);
if(!_useHighResOutput) {
memcpy(_currentBuffer + (scanline << 8) + _drawStartX, _mainScreenBuffer + _drawStartX, (_drawEndX - _drawStartX + 1) << 1);
@ -1437,7 +1439,7 @@ void Ppu::SendFrame()
uint16_t width = _useHighResOutput ? 512 : 256;
uint16_t height = _useHighResOutput ? 478 : 239;
if(!_state.OverscanMode) {
if(!_overscanFrame) {
//Clear the top 7 and bottom 8 rows
int top = (_useHighResOutput ? 14 : 7);
int bottom = (_useHighResOutput ? 16 : 8);
@ -1812,6 +1814,8 @@ void Ppu::Write(uint32_t addr, uint8_t value)
LogDebug("[Debug] Entering mode: " + std::to_string(value & 0x07) + " (SL: " + std::to_string(_scanline) + ")");
}
_state.BgMode = value & 0x07;
ConvertToHiRes();
_state.Mode1Bg3Priority = (value & 0x08) != 0;
_state.Layers[0].LargeTiles = (value & 0x10) != 0;
@ -2092,6 +2096,7 @@ void Ppu::Write(uint32_t addr, uint8_t value)
memset(GetPreviousScreenBuffer(), 0, 512 * 478 * sizeof(uint16_t));
}
}
ConvertToHiRes();
UpdateNmiScanline();
break;
}

1
Core/Ppu.h
View file

@ -73,6 +73,7 @@ private:
uint16_t *_currentBuffer = nullptr;
bool _useHighResOutput = false;
bool _interlacedFrame = false;
bool _overscanFrame = false;
uint8_t _mainScreenFlags[256] = {};
uint16_t _mainScreenBuffer[256] = {};