Fix random background

Author: mkwong98

Core/HdPackLoader.cpp

@@ -658,7 +658,7 @@ void HdPackLoader::ProcessConditionTag(vector<string> &tokens, bool createInvert
 		checkConstraint(_data->Version >= 106, "[HDPack] This feature requires version 106+ of HD Packs");
 		checkConstraint(tokens.size() >= 3, "[HDPack] Condition tag should contain at least 3 parameters");
 
-		int32_t operandA;
+		float operandA;
 		operandA = std::stof(tokens[index++]);
 
 		((HdPackRandomBackgroundCondition*)condition.get())->Initialize(operandA);

Core/HdPpu.cpp

@@ -68,7 +68,7 @@ void HdPpu::DrawPixel()
 		tileInfo.EmphasisBits = _intensifyColorBits >> 6;
 		tileInfo.Tile.PpuBackgroundColor = ReadPaletteRAM(0);
 		tileInfo.Tile.BgColorIndex = backgroundColor;
-		tileInfo.Tile.nameTableIdx = _state.VideoRamAddr;
+		tileInfo.Tile.nameTableIdx = _state.bgTileAddr;
 
 		if(backgroundColor == 0) {
 			tileInfo.Tile.BgColor = tileInfo.Tile.PpuBackgroundColor;
@@ -263,6 +263,13 @@ HdPpu::HdPpu(shared_ptr<Console> console, HdPackData * hdData) : PPU(console)
 		_screenInfo[0] = new HdScreenInfo(isChrRamGame);
 		_screenInfo[1] = new HdScreenInfo(isChrRamGame);
 		_info = _screenInfo[0];
+
+		std::random_device rd;
+		std::mt19937 mt(rd());
+		std::uniform_real_distribution<> dist(0, 1);
+		for (uint16_t i = 0; i < 0x1000; i++) {
+			_nameTableRandVal[i] = dist(mt);
+		}
 	}
 }
 

Core/PPU.cpp

@@ -666,10 +666,12 @@ void PPU::LoadTileInfo()
 
 				_state.LowBitShift |= _nextTile.LowByte;
 				_state.HighBitShift |= _nextTile.HighByte;
+				_state.bgTileAddr = _nextTile.bgTileAddr;
 
 				uint8_t tileIndex = ReadVram(GetNameTableAddr());
 				_nextTile.TileAddr = (tileIndex << 4) | (_state.VideoRamAddr >> 12) | _flags.BackgroundPatternAddr;
 				_nextTile.OffsetY = _state.VideoRamAddr >> 12;
+				_nextTile.bgTileAddr = _state.VideoRamAddr & 0x0FFF;
 				break;
 			}
 

Core/Types.h

@@ -164,6 +164,7 @@ struct PPUState
 	uint16_t TmpVideoRamAddr;
 	bool WriteToggle;
 
+	uint16_t bgTileAddr; //used by HD ppu
 	uint16_t HighBitShift;
 	uint16_t LowBitShift;
 };
@@ -177,6 +178,7 @@ struct TileInfo
 
 	int32_t AbsoluteTileAddr; //used by HD ppu
 	uint8_t OffsetY; //used by HD ppu
+	uint16_t bgTileAddr; //used by HD ppu
 };
 
 struct SpriteInfo : TileInfo