//Queue<double> avr = new Queue<double>();
// Step one cycle
public void Step()
{
// If we change these, change vblank cycle count too
LcdCycles++;
FrameCycles++;
switch (Mode)
{
case LcdMode.ScanlineRendering:
if (LcdCycles >= HDraw_Length)
{
#if THREADED_SCANLINE
if (scanlineThread.IsAlive == false)
{
throw new ArgumentException("Thread pop!");
}
// Wait for scanline rendering to finsih
while (drawScanline == true)
{
}
#endif
LcdCycles -= HDraw_Length;
Mode = LcdMode.HBlank;
if (DispStatRegister.HBlankIrqEnabled)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.HBlank);
}
// Start hblank DMA's (HDMA)
for(int i=0; i < 4; i++)
{
if(gba.Dma[i].DmaCnt.StartTiming == DmaControlRegister.DmaStartTiming.HBlank &&
gba.Dma[i].DmaCnt.ChannelEnabled == true)
{
gba.Dma[i].Started = true;
}
}
}
break;
case LcdMode.HBlank:
if(LcdCycles >= HBlank_Length)
{
LcdCycles -= HBlank_Length;
CurrentScanline++;
if (DispStatRegister.VCounterIrqEnabled &&
CurrentScanline == gba.LcdController.DispStatRegister.VCountSetting)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.VCounterMatch);
}
if (CurrentScanline == 160)
{
Mode = LcdMode.VBlank;
VblankScanlineCycles = 0;
if (DispStatRegister.VBlankIrqEnabled)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.VBlank);
}
// We can set the renderer drawing the frame as soon as we enter vblank
lock (FrameBuffer)
{
// Flip frames
if (FrameBuffer == frameBuffer0)
{
FrameBuffer = frameBuffer1;
drawBuffer = frameBuffer0;
}
else
{
FrameBuffer = frameBuffer0;
drawBuffer = frameBuffer1;
}
// Clear the draw buffer to the background color
//using (var graphics = Graphics.FromImage(drawBuffer.Bitmap))
//{
// graphics.Clear(Palettes.Palette0[0]);
//}
}
// lock to 60fps - 1000 / 60.0
double fps60 = 16.6666666;
/*
double frameTime = gba.EmulatorTimer.Elapsed.TotalMilliseconds - lastFrameTime;
avr.Enqueue(frameTime);
if (avr.Count == 11)
{
avr.Dequeue();
double frameAverage = avr.Average();
gba.LogMessage(String.Format("frame Ms {0:N2}", frameAverage));
}
*/
while (gba.EmulatorTimer.Elapsed.TotalMilliseconds - lastFrameTime < fps60)
{
}
lastFrameTime = gba.EmulatorTimer.Elapsed.TotalMilliseconds;
if (gba.OnFrame != null)
{
gba.OnFrame();
}
}
else
{
Mode = LcdMode.ScanlineRendering;
Render();
}
}
break;
case LcdMode.VBlank:
VblankScanlineCycles++;
if (LcdCycles >= VBlank_Length)
{
// 160 + 68 lines per screen
if(CurrentScanline != 227 ||
FrameCycles != ScreenRefresh_Length)
{
throw new InvalidOperationException("LCD: Scanlines / cycles mismatch");
}
LcdCycles -= VBlank_Length;
FrameCycles = 0;
CurrentScanline = 0;
Mode = LcdMode.ScanlineRendering;
Render();
if (DispStatRegister.VCounterIrqEnabled &&
CurrentScanline == gba.LcdController.DispStatRegister.VCountSetting)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.VCounterMatch);
}
}
else
{
// HBlanks IRQ's still fire durng vblank
if(VblankScanlineCycles == HDraw_Length)
{
if (DispStatRegister.HBlankIrqEnabled)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.HBlank);
}
}
// We are within vblank
if(VblankScanlineCycles == ScanLine_Length)
{
VblankScanlineCycles = 0;
CurrentScanline++;
if (DispStatRegister.VCounterIrqEnabled &&
CurrentScanline == gba.LcdController.DispStatRegister.VCountSetting)
{
gba.Interrupts.RequestInterrupt(Interrupts.InterruptType.VCounterMatch);
}
}
}
break;
}
}
public bool RenderSpritePixel(DirectBitmap drawBuffer, int screenX, int screenY, int priority, bool windowing, int windowRegion, ref int bgVisibleOverride)
{
int paletteIndex;
foreach (var obj in priorityObjList[priority])
{
// Clip against the bounding box which can be DoubleSize. This is the only time doublesize is actually checked
if (obj.BoundingBoxScreenSpace.ContainsPoint(screenX, screenY) == false)
{
continue;
}
if (obj.Attributes.RotationAndScaling)
{
int sourceWidth = obj.Attributes.Dimensions.Width;
int sourceHeight = obj.Attributes.Dimensions.Height;
// The game will have set up the matrix to be the inverse texture mapping matrix. I.E it maps from screen space to texture space. Just what we need!
OamAffineMatrix rotScaleMatrix = obj.Attributes.AffineMatrix();
// NB: Order of operations counts here!
// Transform with the origin set to the centre of the sprite (that's what the - width/height /2 below is for)
int originX = screenX - obj.Attributes.XPositionAdjusted() - (sourceWidth / 2);
int originY = screenY - obj.Attributes.YPositionAdjusted() - (sourceHeight / 2);
// Not well documented anywhere but when double size is enabled we render offset by half the original source width / height
if (obj.Attributes.DoubleSize)
{
originX -= sourceWidth / 2;
originY -= sourceHeight / 2;
}
int transformedX, transformedY;
rotScaleMatrix.Multiply(originX, originY, out transformedX, out transformedY);
// Transform back from centre of sprite
transformedX += (sourceWidth / 2);
transformedY += (sourceHeight / 2);
paletteIndex = obj.PixelValue(transformedX, transformedY);
}
else
{
//paletteIndex = obj.PixelScreenValue(x, scanline);
paletteIndex = obj.PixelValue(screenX - obj.Attributes.XPositionAdjusted(), screenY - obj.Attributes.YPositionAdjusted());
}
// Pal 0 == Transparent
if (paletteIndex == 0)
{
continue;
}
// TODO: I *think* this will render the Obj window correctly but i cannot test it yet
// This pixel belongs to a sprite in the Obj Window and Win 0 & 1 are not enclosing this pixel
if (windowing &&
gba.LcdController.DisplayControlRegister.DisplayObjWin &&
obj.Attributes.Mode == ObjAttributes.ObjMode.ObjWindow &&
((windowRegion & (int)TileHelpers.WindowRegion.WindowIn) == 0))
{
bgVisibleOverride = gba.LcdController.Windows[(int)Window.WindowName.WindowObj].DisplayBg0 |
gba.LcdController.Windows[(int)Window.WindowName.WindowObj].DisplayBg1 |
gba.LcdController.Windows[(int)Window.WindowName.WindowObj].DisplayBg2 |
gba.LcdController.Windows[(int)Window.WindowName.WindowObj].DisplayBg3;
return(false);
}
drawBuffer.SetPixel(screenX, screenY, gba.LcdController.Palettes.Palette1[paletteIndex]);
return(true);
}
return(false);
}
