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PPU: Skip high priority tile processing if scanline contains no high priority tiles (optimization)

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This commit is contained in:
Sour 2019-07-12 08:33:09 -04:00
parent 48a7cdc252
commit f68aa2a8f9
2 changed files with 15 additions and 7 deletions
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21
Core/Ppu.cpp
View file

@ -192,6 +192,7 @@ void Ppu::GetTilemapData(uint8_t layerIndex, uint8_t columnIndex)
uint16_t addr = baseOffset + (column & 0x1F) + (config.DoubleWidth ? (column & 0x20) << 5 : 0);
_layerData[layerIndex].Tiles[columnIndex].TilemapData = _vram[addr];
_layerData[layerIndex].Tiles[columnIndex].VScroll = vScroll;
_layerData[layerIndex].HasPriorityTiles |= (_vram[addr] & 0x2000) >> 13;
}
template<bool hiResMode, uint8_t bpp, bool secondTile>
@ -401,6 +402,9 @@ bool Ppu::ProcessEndOfScanline(uint16_t hClock)
_spriteEvalStart = 0;
_spriteEvalEnd = 0;
_spriteFetchingDone = false;
for(int i = 0; i < 4; i++) {
_layerData[i].HasPriorityTiles = false;
}
memcpy(_spritePriority, _spritePriorityCopy, sizeof(_spritePriority));
memcpy(_spritePalette, _spritePaletteCopy, sizeof(_spritePalette));
@ -945,10 +949,6 @@ void Ppu::RenderSprites()
template<uint8_t layerIndex, uint8_t bpp, bool processHighPriority, bool forMainScreen, uint16_t basePaletteOffset, bool hiResMode, uint8_t activeWindowCount, bool applyMosaic, bool directColorMode>
void Ppu::RenderTilemap()
{
if(!IsRenderRequired<forMainScreen>(layerIndex)) {
return;
}
/* The current layer's options */
uint16_t hScrollOriginal = _layerConfig[layerIndex].HScroll;
uint16_t hScroll = hiResMode ? (hScrollOriginal << 1) : hScrollOriginal;
@ -971,8 +971,11 @@ void Ppu::RenderTilemap()
}
uint16_t tilemapData = tileData[lookupIndex].TilemapData;
uint16_t* chrData = tileData[lookupIndex].ChrData;
if((uint8_t)processHighPriority != ((tilemapData & 0x2000) >> 13)) {
continue;
}
uint16_t* chrData = tileData[lookupIndex].ChrData;
bool hMirror = (tilemapData & 0x4000) != 0;
uint8_t xOffset;
@ -1012,13 +1015,13 @@ void Ppu::RenderTilemap()
if(color > 0 && (!activeWindowCount || !ProcessMaskWindow<layerIndex>(activeWindowCount, x))) {
if(forMainScreen) {
if(!_rowPixelFlags[x] && ((uint8_t)processHighPriority == ((tilemapData & 0x2000) >> 13))) {
if(!_rowPixelFlags[x]) {
/* Keeps track of whether or not the pixel is allowed to participate in color math */
uint8_t pixelFlags = PixelFlags::Filled | (((_colorMathEnabled >> layerIndex) & 0x01) ? PixelFlags::AllowColorMath : 0);
DrawMainPixel(x, paletteColor, pixelFlags);
}
} else {
if(!_subScreenFilled[x] && ((uint8_t)processHighPriority == ((tilemapData & 0x2000) >> 13))) {
if(!_subScreenFilled[x]) {
DrawSubPixel(x, paletteColor);
}
}
@ -2129,6 +2132,10 @@ void Ppu::RenderTilemap()
template<uint8_t layerIndex, uint8_t bpp, bool processHighPriority, bool forMainScreen, uint16_t basePaletteOffset>
void Ppu::RenderTilemap()
{
if(!IsRenderRequired<forMainScreen>(layerIndex) || processHighPriority && !_layerData[layerIndex].HasPriorityTiles) {
return;
}
if(_bgMode == 5 || _bgMode == 6) {
RenderTilemap<layerIndex, bpp, processHighPriority, forMainScreen, basePaletteOffset, true>();
} else {

1
Core/PpuTypes.h
View file

@ -41,6 +41,7 @@ struct TileData
struct LayerData
{
TileData Tiles[33];
bool HasPriorityTiles;
};
struct LayerConfig