public unsafe void Begin()
{
if (_CanRender)
{
_IsRendering = true;
lastLineState = RenderLineState.RenderClipping;
if (highResSnap)
{
log = new StreamWriter(snapfile + "log.txt");
takingSnap = true;
}
}
}
public void BlankPixel(int X, int Y)
{
if (_CanRender & _IsRendering)
{
//Check if we should cut this line
if (Y >= _FirstLinesTCut & Y < (_ScanLines + _FirstLinesTCut))
{
if (lastLineState != oppu.rstate)
{
lastLineState = oppu.rstate;
lastTileNo = -1;
}
if (hasHiResPack)
{
RenderTile(X, Y);
}
}
}
}
public void DrawPixel(int X, int Y, int Color)
{
if (_CanRender & _IsRendering)
{
//Check if we should cut this line
if (Y >= _FirstLinesTCut & Y < (_ScanLines + _FirstLinesTCut))
{
if (lastLineState != oppu.rstate)
{
lastLineState = oppu.rstate;
lastTileNo = -1;
}
if (oppu.rstate == RenderLineState.ClearScanline || oppu.rstate == RenderLineState.RenderClipping || !hasHiResPack)
{
DrawBasicPixel(X, Y, Color);
}
else
{
RenderTile(X, Y);
}
}
}
}
public void RunPPU()
{
ScanCycle++;
TileCycle++;
if (ScanCycle == 341)
{
ScanCycle = 0;
TileCycle = 8;
SpritesRendered = false;
ScanLine++;
//Render the actual data to be displayed on the screen
if (ScanLine >= ScanlineOfEndOfVblank & ScanLine <= 239 + ScanlineOfEndOfVblank)
{
rstate = RenderLineState.ClearScanline;
//Clean up the line from before
/*fixed (byte* pSrc = piorityBuff)
* {
* byte* ps = pSrc;
* for (int i = 0; i < 256; i += 8)
* {
*((UInt64*)(ps + i)) = 0;
* }
* }*/
//Draw background color
byte B = MEM_PPU[0x3F00];
if (B >= 63)
{
B = 63;
}
for (int i = 0; i < 256; i++)
{
VIDEO.DrawPixel(i, ScanLine - ScanlineOfEndOfVblank, PALETTE[B]);
piorityBuff[i] = 0;
}
//Tick mapper timer (scanline timer)
if (BackgroundVisibility | SpriteVisibility)
{
MEM_CPU.MAPPER.TickScanlineTimer();
}
}
//do nothing for 1 scanline
if (ScanLine == ScanlinesPerFrame)
{
//Handle the speed
if (!NoLimiter)
{
double currentTime = Timer.GetCurrentTime();
_currentFrameTime = currentTime - _lastFrameTime;
if ((_currentFrameTime < FramePeriod))
{
while (true)
{
if ((Timer.GetCurrentTime() - _lastFrameTime) >= FramePeriod)
{
break;
}
}
}
}
_lastFrameTime = Timer.GetCurrentTime();
ScanLine = -1;
FPS++;
//Odd frame ? only in ntsc
if (TV == TVFORMAT.NTSC)
{
OddFrame = !OddFrame;
if (!OddFrame & BackgroundVisibility)
{
if (BBackgroundVisibility)
{
ScanCycle += 1;
}
}
BBackgroundVisibility = BackgroundVisibility;
}
//render into screen
VIDEO.RenderFrame();
}
}
else if (ScanLine >= ScanlineOfEndOfVblank & ScanLine <= 239 + ScanlineOfEndOfVblank)
{
if (ScanCycle < 256) //Render on the screen
{
if (TileCycle >= 8) //Render BG tile each 8 cycles
{
if (BackgroundVisibility)
{
if (rstate != RenderLineState.RenderBackground)
{
rstate = RenderLineState.RenderBackground;
hflip = true;
vflip = false;
}
RenderNextBackgroundTile();
}
TileCycle -= 8;
}
}
else if (!SpritesRendered)
{
if (SpriteVisibility)
{
rstate = RenderLineState.RenderSprite;
RenderSprites();
}
if (BackgroundClipping)
{
for (int i = 0; i < 8; i++)
{
VIDEO.DrawPixel(i, ScanLine - ScanlineOfEndOfVblank, 0);
}
}
//Update Hscroll
if (SpriteVisibility | BackgroundVisibility)
{
VRAM_ADDRESS = (ushort)((VRAM_ADDRESS & 0x7BE0) | (VRAM_TEMP & 0x041F));
nameTableAddress = (VRAM_ADDRESS & 0x0800) +
(VRAM_TEMP & 0x0400) + 0x2000;
HScroll = (((VRAM_TEMP & 0x001F) << 3) | TileX);
}
SpritesRendered = true;
}
}
//Start of vblank
if (ScanLine == 0 & ScanCycle == 339)
{
if (ExecuteNMIOnVBlank)
{
CPU.NMIRequest = true;
}
VBlank = true;
}
//End of vblank
else if (ScanLine == ScanlineOfEndOfVblank)
{
if (ScanCycle == 305)
{
//Update Vscroll
if (SpriteVisibility | BackgroundVisibility)
{
VRAM_ADDRESS = VRAM_TEMP;
VScroll = (((VRAM_TEMP & 0x03E0) >> 2) | ((VRAM_TEMP & 0x7000) >> 12));
if (VScroll >= 240)
{
VScroll -= 256;
}
}
}
if (ScanCycle == 339)
{
VIDEO.Begin();
//Clear flags
Sprite0Hit = false;
VBlank = false;
SpriteCrossed = 0;
}
}
}
