public VPC(PCEngine pce, VDC vdc1, VDC vdc2, VCE vce, HuC6280 cpu)
{
PCE = pce;
VDC1 = vdc1;
VDC2 = vdc2;
VCE = vce;
CPU = cpu;
// latch initial video buffer
FrameBuffer = vdc1.GetVideoBuffer();
FrameWidth = vdc1.BufferWidth;
FrameHeight = vdc1.BufferHeight;
}
public VPC(PCEngine pce, VDC vdc1, VDC vdc2, VCE vce, HuC6280 cpu)
{
PCE = pce;
VDC1 = vdc1;
VDC2 = vdc2;
VCE = vce;
CPU = cpu;
// latch initial video buffer
FrameBuffer = vdc1.GetVideoBuffer();
FrameWidth = vdc1.BufferWidth;
FrameHeight = vdc1.BufferHeight;
}
private void Init(GameInfo game, byte[] rom)
{
Cpu = new HuC6280(MemoryCallbacks);
VCE = new VCE();
VDC1 = new VDC(this, Cpu, VCE);
PSG = new HuC6280PSG(735);
SCSI = new ScsiCDBus(this, disc);
Cpu.Logger = s => Tracer.Put(s);
if (TurboGrafx)
{
Ram = new byte[0x2000];
Cpu.ReadMemory21 = ReadMemory;
Cpu.WriteMemory21 = WriteMemory;
Cpu.WriteVDC = VDC1.WriteVDC;
_soundProvider = PSG;
CDAudio = new CDAudio(null, 0);
}
else if (SuperGrafx)
{
VDC2 = new VDC(this, Cpu, VCE);
VPC = new VPC(this, VDC1, VDC2, VCE, Cpu);
Ram = new byte[0x8000];
Cpu.ReadMemory21 = ReadMemorySGX;
Cpu.WriteMemory21 = WriteMemorySGX;
Cpu.WriteVDC = VDC1.WriteVDC;
_soundProvider = PSG;
CDAudio = new CDAudio(null, 0);
}
else if (TurboCD)
{
Ram = new byte[0x2000];
CDRam = new byte[0x10000];
ADPCM = new ADPCM(this, SCSI);
Cpu.ReadMemory21 = ReadMemoryCD;
Cpu.WriteMemory21 = WriteMemoryCD;
Cpu.WriteVDC = VDC1.WriteVDC;
CDAudio = new CDAudio(disc);
SetCDAudioCallback();
PSG.MaxVolume = short.MaxValue * 3 / 4;
SoundMixer = new SoundMixer(735, PSG, CDAudio, ADPCM);
_soundProvider = SoundMixer;
Cpu.ThinkAction = cycles => { SCSI.Think(); ADPCM.Think(cycles); };
}
if (rom.Length == 0x60000)
{
// 384k roms require special loading code. Why ;_;
// In memory, 384k roms look like [1st 256k][Then full 384k]
RomData = new byte[0xA0000];
var origRom = rom;
for (int i = 0; i < 0x40000; i++)
{
RomData[i] = origRom[i];
}
for (int i = 0; i < 0x60000; i++)
{
RomData[i + 0x40000] = origRom[i];
}
RomLength = RomData.Length;
}
else if (rom.Length > 1024 * 1024)
{
// If the rom is bigger than 1 megabyte, switch to Street Fighter 2 mapper
Cpu.ReadMemory21 = ReadMemorySF2;
Cpu.WriteMemory21 = WriteMemorySF2;
RomData = rom;
RomLength = RomData.Length;
// user request: current value of the SF2MapperLatch on the tracelogger
Cpu.Logger = s => Tracer.Put(new TraceInfo
{
Disassembly = $"{SF2MapperLatch:X1}:{s}",
RegisterInfo = ""
});
}
else
{
// normal rom.
RomData = rom;
RomLength = RomData.Length;
}
if (game["BRAM"] || Type == NecSystemType.TurboCD)
{
BramEnabled = true;
BRAM = new byte[2048];
// pre-format BRAM. damn are we helpful.
BRAM[0] = 0x48; BRAM[1] = 0x55; BRAM[2] = 0x42; BRAM[3] = 0x4D;
BRAM[4] = 0x00; BRAM[5] = 0x88; BRAM[6] = 0x10; BRAM[7] = 0x80;
}
if (game["SuperSysCard"])
{
SuperRam = new byte[0x30000];
}
if (game["ArcadeCard"])
{
ArcadeRam = new byte[0x200000];
ArcadeCard = true;
ArcadeCardRewindHack = Settings.ArcadeCardRewindHack;
for (int i = 0; i < 4; i++)
{
ArcadePage[i] = new ArcadeCardPage();
}
}
if (game["PopulousSRAM"])
{
PopulousRAM = new byte[0x8000];
Cpu.ReadMemory21 = ReadMemoryPopulous;
Cpu.WriteMemory21 = WriteMemoryPopulous;
}
// the gamedb can force sprite limit on, ignoring settings
if (game["ForceSpriteLimit"] || game.NotInDatabase)
{
ForceSpriteLimit = true;
}
if (game["CdVol"])
{
CDAudio.MaxVolume = int.Parse(game.OptionValue("CdVol"));
}
if (game["PsgVol"])
{
PSG.MaxVolume = int.Parse(game.OptionValue("PsgVol"));
}
if (game["AdpcmVol"])
{
ADPCM.MaxVolume = int.Parse(game.OptionValue("AdpcmVol"));
}
// the gamedb can also force equalizevolumes on
if (TurboCD && (Settings.EqualizeVolume || game["EqualizeVolumes"] || game.NotInDatabase))
{
SoundMixer.EqualizeVolumes();
}
// Ok, yes, HBlankPeriod's only purpose is game-specific hax.
// 1) At least they're not coded directly into the emulator, but instead data-driven.
// 2) The games which have custom HBlankPeriods work without it, the override only
// serves to clean up minor gfx anomalies.
// 3) There's no point in haxing the timing with incorrect values in an attempt to avoid this.
// The proper fix is cycle-accurate/bus-accurate timing. That isn't coming to the C#
// version of this core. Let's just acknolwedge that the timing is imperfect and fix
// it in the least intrusive and most honest way we can.
if (game["HBlankPeriod"])
{
VDC1.HBlankCycles = game.GetIntValue("HBlankPeriod");
}
// This is also a hack. Proper multi-res/TV emulation will be a native-code core feature.
if (game["MultiResHack"])
{
VDC1.MultiResHack = game.GetIntValue("MultiResHack");
}
Cpu.ResetPC();
Tracer = new TraceBuffer {
Header = Cpu.TraceHeader
};
var ser = new BasicServiceProvider(this);
ServiceProvider = ser;
ser.Register <ITraceable>(Tracer);
ser.Register <IDisassemblable>(Cpu);
ser.Register <IVideoProvider>((IVideoProvider)VPC ?? VDC1);
ser.Register <ISoundProvider>(_soundProvider);
ser.Register <IStatable>(new StateSerializer(SyncState));
SetupMemoryDomains();
}
private void checkBoxVDC2_CheckedChanged(object sender, EventArgs e)
{
vdc = checkBoxVDC2.Checked ? emu.VDC2 : emu.VDC1;
UpdateValues();
}
private void RenderSpritesScanline(VDC vdc, byte lowPriority, byte highPriority, bool show)
{
if (vdc.SpritesEnabled == false)
{
return;
}
// clear inter-sprite priority buffer
Array.Clear(InterSpritePriorityBuffer, 0, FrameWidth);
var testRange = new MutableIntRange(0, vdc.ActiveLine + 1);
for (int i = 0; i < 64; i++)
{
int y = (vdc.SpriteAttributeTable[(i * 4) + 0] & 1023) - 64;
int x = (vdc.SpriteAttributeTable[(i * 4) + 1] & 1023) - 32;
ushort flags = vdc.SpriteAttributeTable[(i * 4) + 3];
byte height = heightTable[(flags >> 12) & 3];
testRange.Min = vdc.ActiveLine - height;
if (!testRange.StrictContains(y))
{
continue;
}
int patternNo = (((vdc.SpriteAttributeTable[(i * 4) + 2]) >> 1) & 0x1FF);
int paletteBase = 256 + ((flags & 15) * 16);
int width = (flags & 0x100) == 0 ? 16 : 32;
bool priority = (flags & 0x80) != 0;
bool hflip = (flags & 0x0800) != 0;
bool vflip = (flags & 0x8000) != 0;
if (width == 32)
{
patternNo &= 0x1FE;
}
int yofs;
if (vflip == false)
{
yofs = (vdc.ActiveLine - y) & 15;
if (height == 32)
{
patternNo &= 0x1FD;
if (vdc.ActiveLine - y >= 16)
{
y += 16;
patternNo += 2;
}
}
else if (height == 64)
{
patternNo &= 0x1F9;
if (vdc.ActiveLine - y >= 48)
{
y += 48;
patternNo += 6;
}
else if (vdc.ActiveLine - y >= 32)
{
y += 32;
patternNo += 4;
}
else if (vdc.ActiveLine - y >= 16)
{
y += 16;
patternNo += 2;
}
}
}
else // vflip == true
{
yofs = 15 - ((vdc.ActiveLine - y) & 15);
if (height == 32)
{
patternNo &= 0x1FD;
if (vdc.ActiveLine - y < 16)
{
y += 16;
patternNo += 2;
}
}
else if (height == 64)
{
patternNo &= 0x1F9;
if (vdc.ActiveLine - y < 16)
{
y += 48;
patternNo += 6;
}
else if (vdc.ActiveLine - y < 32)
{
y += 32;
patternNo += 4;
}
else if (vdc.ActiveLine - y < 48)
{
y += 16;
patternNo += 2;
}
}
}
if (hflip == false)
{
if (x + width > 0 && y + height > 0)
{
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show)
{
FrameBuffer[((vdc.ActiveLine + vdc.ViewStartLine - PCE.Settings.Top_Line) * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
}
PriorityBuffer[xs] = myPriority;
}
}
}
}
if (width == 32)
{
patternNo++;
x += 16;
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show)
{
FrameBuffer[((vdc.ActiveLine + vdc.ViewStartLine - PCE.Settings.Top_Line) * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
}
PriorityBuffer[xs] = myPriority;
}
}
}
}
}
else
{ // hflip = true
if (x + width > 0 && y + height > 0)
{
if (width == 32)
{
patternNo++;
}
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + 15 - (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show)
{
FrameBuffer[((vdc.ActiveLine + vdc.ViewStartLine - PCE.Settings.Top_Line) * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
}
PriorityBuffer[xs] = myPriority;
}
}
}
if (width == 32)
{
patternNo--;
x += 16;
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + 15 - (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show)
{
FrameBuffer[((vdc.ActiveLine + vdc.ViewStartLine - PCE.Settings.Top_Line) * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
}
PriorityBuffer[xs] = myPriority;
}
}
}
}
}
}
}
}
private unsafe void RenderBackgroundScanline(VDC vdc, byte priority, bool show)
{
if (vdc.BackgroundEnabled == false)
{
return;
}
// per-line parameters
int vertLine = vdc.BackgroundY;
vertLine %= vdc.BatHeight * 8;
int yTile = (vertLine / 8);
int yOfs = vertLine % 8;
int xScroll = vdc.Registers[BXR] & 0x3FF;
int BatRowMask = vdc.BatWidth - 1;
fixed(ushort *VRAMptr = vdc.VRAM)
fixed(int *PALptr = VCE.Palette)
fixed(byte *Patternptr = vdc.PatternBuffer)
fixed(int *FBptr = FrameBuffer)
fixed(byte *Priortyptr = PriorityBuffer)
{
// pointer to the BAT and the framebuffer for this line
ushort *BatRow = VRAMptr + yTile * vdc.BatWidth;
int * dst = FBptr + (vdc.ActiveLine + vdc.ViewStartLine - PCE.Settings.Top_Line) * FrameWidth;
// parameters that change per tile
ushort BatEnt;
int tileNo, paletteNo, paletteBase;
byte * src;
// calculate tile number and offset for first tile
int xTile = (xScroll >> 3) & BatRowMask;
int xOfs = xScroll & 7;
// update per-tile parameters for first tile
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
for (int x = 0; x < FrameWidth; x++)
{
if (Priortyptr[x] < priority)
{
byte c = *src;
if (c != 0)
{
dst[x] = show ? PALptr[paletteBase + c] : PALptr[0];
Priortyptr[x] = priority;
}
}
xOfs++;
src++;
if (xOfs == 8)
{
// update tile number
xOfs = 0;
xTile++;
xTile &= BatRowMask;
// update per-tile parameters
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
}
}
}
}
void Init(GameInfo game, byte[] rom)
{
Controller = NullController.GetNullController();
Cpu = new HuC6280(CoreComm);
VCE = new VCE();
VDC1 = new VDC(this, Cpu, VCE);
PSG = new HuC6280PSG();
SCSI = new ScsiCDBus(this, disc);
Cpu.Logger = (s) => CoreComm.Tracer.Put(s);
if (TurboGrafx)
{
Ram = new byte[0x2000];
Cpu.ReadMemory21 = ReadMemory;
Cpu.WriteMemory21 = WriteMemory;
Cpu.WriteVDC = VDC1.WriteVDC;
soundProvider = PSG;
CDAudio = new CDAudio(null, 0);
}
else if (SuperGrafx)
{
VDC2 = new VDC(this, Cpu, VCE);
VPC = new VPC(this, VDC1, VDC2, VCE, Cpu);
Ram = new byte[0x8000];
Cpu.ReadMemory21 = ReadMemorySGX;
Cpu.WriteMemory21 = WriteMemorySGX;
Cpu.WriteVDC = VDC1.WriteVDC;
soundProvider = PSG;
CDAudio = new CDAudio(null, 0);
}
else if (TurboCD)
{
Ram = new byte[0x2000];
CDRam = new byte[0x10000];
ADPCM = new ADPCM(this, SCSI);
Cpu.ReadMemory21 = ReadMemoryCD;
Cpu.WriteMemory21 = WriteMemoryCD;
Cpu.WriteVDC = VDC1.WriteVDC;
CDAudio = new CDAudio(disc);
SetCDAudioCallback();
PSG.MaxVolume = short.MaxValue * 3 / 4;
SoundMixer = new SoundMixer(PSG, CDAudio, ADPCM);
SoundSynchronizer = new MetaspuSoundProvider(ESynchMethod.ESynchMethod_V);
soundProvider = SoundSynchronizer;
Cpu.ThinkAction = (cycles) => { SCSI.Think(); ADPCM.Think(cycles); };
}
if (rom.Length == 0x60000)
{
// 384k roms require special loading code. Why ;_;
// In memory, 384k roms look like [1st 256k][Then full 384k]
RomData = new byte[0xA0000];
var origRom = rom;
for (int i = 0; i < 0x40000; i++)
RomData[i] = origRom[i];
for (int i = 0; i < 0x60000; i++)
RomData[i + 0x40000] = origRom[i];
RomLength = RomData.Length;
}
else if (rom.Length > 1024 * 1024)
{
// If the rom is bigger than 1 megabyte, switch to Street Fighter 2 mapper
Cpu.ReadMemory21 = ReadMemorySF2;
Cpu.WriteMemory21 = WriteMemorySF2;
RomData = rom;
RomLength = RomData.Length;
// user request: current value of the SF2MapperLatch on the tracelogger
Cpu.Logger = (s) => CoreComm.Tracer.Put(string.Format("{0:X1}:{1}", SF2MapperLatch, s));
}
else
{
// normal rom.
RomData = rom;
RomLength = RomData.Length;
}
if (game["BRAM"] || Type == NecSystemType.TurboCD)
{
BramEnabled = true;
BRAM = new byte[2048];
// pre-format BRAM. damn are we helpful.
BRAM[0] = 0x48; BRAM[1] = 0x55; BRAM[2] = 0x42; BRAM[3] = 0x4D;
BRAM[4] = 0x00; BRAM[5] = 0x88; BRAM[6] = 0x10; BRAM[7] = 0x80;
}
if (game["SuperSysCard"])
SuperRam = new byte[0x30000];
if (game["ArcadeCard"])
{
ArcadeRam = new byte[0x200000];
ArcadeCard = true;
ArcadeCardRewindHack = _settings.ArcadeCardRewindHack;
for (int i = 0; i < 4; i++)
ArcadePage[i] = new ArcadeCardPage();
}
if (game["PopulousSRAM"])
{
PopulousRAM = new byte[0x8000];
Cpu.ReadMemory21 = ReadMemoryPopulous;
Cpu.WriteMemory21 = WriteMemoryPopulous;
}
// the gamedb can force sprite limit on, ignoring settings
if (game["ForceSpriteLimit"] || game.NotInDatabase)
ForceSpriteLimit = true;
if (game["CdVol"])
CDAudio.MaxVolume = int.Parse(game.OptionValue("CdVol"));
if (game["PsgVol"])
PSG.MaxVolume = int.Parse(game.OptionValue("PsgVol"));
if (game["AdpcmVol"])
ADPCM.MaxVolume = int.Parse(game.OptionValue("AdpcmVol"));
// the gamedb can also force equalizevolumes on
if (TurboCD && (_settings.EqualizeVolume || game["EqualizeVolumes"] || game.NotInDatabase))
SoundMixer.EqualizeVolumes();
// Ok, yes, HBlankPeriod's only purpose is game-specific hax.
// 1) At least they're not coded directly into the emulator, but instead data-driven.
// 2) The games which have custom HBlankPeriods work without it, the override only
// serves to clean up minor gfx anomalies.
// 3) There's no point in haxing the timing with incorrect values in an attempt to avoid this.
// The proper fix is cycle-accurate/bus-accurate timing. That isn't coming to the C#
// version of this core. Let's just acknolwedge that the timing is imperfect and fix
// it in the least intrusive and most honest way we can.
if (game["HBlankPeriod"])
VDC1.HBlankCycles = game.GetIntValue("HBlankPeriod");
// This is also a hack. Proper multi-res/TV emulation will be a native-code core feature.
if (game["MultiResHack"])
VDC1.MultiResHack = game.GetIntValue("MultiResHack");
Cpu.ResetPC();
SetupMemoryDomains();
}
void RenderSpritesScanline(VDC vdc, byte lowPriority, byte highPriority, bool show)
{
if (vdc.SpritesEnabled == false)
return;
// clear inter-sprite priority buffer
Array.Clear(InterSpritePriorityBuffer, 0, FrameWidth);
for (int i = 0; i < 64; i++)
{
int y = (vdc.SpriteAttributeTable[(i * 4) + 0] & 1023) - 64;
int x = (vdc.SpriteAttributeTable[(i * 4) + 1] & 1023) - 32;
ushort flags = vdc.SpriteAttributeTable[(i * 4) + 3];
int height = heightTable[(flags >> 12) & 3];
if (y + height <= vdc.ActiveLine || y > vdc.ActiveLine)
continue;
int patternNo = (((vdc.SpriteAttributeTable[(i * 4) + 2]) >> 1) & 0x1FF);
int paletteBase = 256 + ((flags & 15) * 16);
int width = (flags & 0x100) == 0 ? 16 : 32;
bool priority = (flags & 0x80) != 0;
bool hflip = (flags & 0x0800) != 0;
bool vflip = (flags & 0x8000) != 0;
if (width == 32)
patternNo &= 0x1FE;
int yofs;
if (vflip == false)
{
yofs = (vdc.ActiveLine - y) & 15;
if (height == 32)
{
patternNo &= 0x1FD;
if (vdc.ActiveLine - y >= 16)
{
y += 16;
patternNo += 2;
}
}
else if (height == 64)
{
patternNo &= 0x1F9;
if (vdc.ActiveLine - y >= 48)
{
y += 48;
patternNo += 6;
}
else if (vdc.ActiveLine - y >= 32)
{
y += 32;
patternNo += 4;
}
else if (vdc.ActiveLine - y >= 16)
{
y += 16;
patternNo += 2;
}
}
}
else // vflip == true
{
yofs = 15 - ((vdc.ActiveLine - y) & 15);
if (height == 32)
{
patternNo &= 0x1FD;
if (vdc.ActiveLine - y < 16)
{
y += 16;
patternNo += 2;
}
}
else if (height == 64)
{
patternNo &= 0x1F9;
if (vdc.ActiveLine - y < 16)
{
y += 48;
patternNo += 6;
}
else if (vdc.ActiveLine - y < 32)
{
y += 32;
patternNo += 4;
}
else if (vdc.ActiveLine - y < 48)
{
y += 16;
patternNo += 2;
}
}
}
if (hflip == false)
{
if (x + width > 0 && y + height > 0)
{
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show) FrameBuffer[(vdc.ActiveLine * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
PriorityBuffer[xs] = myPriority;
}
}
}
}
if (width == 32)
{
patternNo++;
x += 16;
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show) FrameBuffer[(vdc.ActiveLine * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
PriorityBuffer[xs] = myPriority;
}
}
}
}
}
else
{ // hflip = true
if (x + width > 0 && y + height > 0)
{
if (width == 32)
patternNo++;
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + 15 - (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show) FrameBuffer[(vdc.ActiveLine * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
PriorityBuffer[xs] = myPriority;
}
}
}
if (width == 32)
{
patternNo--;
x += 16;
for (int xs = x >= 0 ? x : 0; xs < x + 16 && xs >= 0 && xs < FrameWidth; xs++)
{
byte pixel = vdc.SpriteBuffer[(patternNo * 256) + (yofs * 16) + 15 - (xs - x)];
if (pixel != 0 && InterSpritePriorityBuffer[xs] == 0)
{
InterSpritePriorityBuffer[xs] = 1;
byte myPriority = priority ? highPriority : lowPriority;
if (PriorityBuffer[xs] < myPriority)
{
if (show) FrameBuffer[(vdc.ActiveLine * FrameWidth) + xs] = VCE.Palette[paletteBase + pixel];
PriorityBuffer[xs] = myPriority;
}
}
}
}
}
}
}
}
unsafe void RenderBackgroundScanline(VDC vdc, byte priority, bool show)
{
if (vdc.BackgroundEnabled == false)
return;
// per-line parameters
int vertLine = vdc.BackgroundY;
vertLine %= vdc.BatHeight * 8;
int yTile = (vertLine / 8);
int yOfs = vertLine % 8;
int xScroll = vdc.Registers[BXR] & 0x3FF;
int BatRowMask = vdc.BatWidth - 1;
fixed (ushort* VRAMptr = vdc.VRAM)
fixed (int* PALptr = VCE.Palette)
fixed (byte* Patternptr = vdc.PatternBuffer)
fixed (int* FBptr = FrameBuffer)
fixed (byte* Priortyptr = PriorityBuffer)
{
// pointer to the BAT and the framebuffer for this line
ushort* BatRow = VRAMptr + yTile * vdc.BatWidth;
int* dst = FBptr + vdc.ActiveLine * FrameWidth;
// parameters that change per tile
ushort BatEnt;
int tileNo, paletteNo, paletteBase;
byte* src;
// calculate tile number and offset for first tile
int xTile = (xScroll >> 3) & BatRowMask;
int xOfs = xScroll & 7;
// update per-tile parameters for first tile
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
for (int x = 0; x < FrameWidth; x++)
{
if (Priortyptr[x] < priority)
{
byte c = *src;
if (c != 0)
{
dst[x] = show ? PALptr[paletteBase + c] : PALptr[0];
Priortyptr[x] = priority;
}
}
xOfs++;
src++;
if (xOfs == 8)
{
// update tile number
xOfs = 0;
xTile++;
xTile &= BatRowMask;
// update per-tile parameters
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
}
}
}
}
