ShuriZma
/
BizHawk
mirror of https://github.com/TASEmulators/BizHawk.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[PCE] at least somewhat improved VDC timing

This commit is contained in:
beirich 2011-06-15 04:55:22 +00:00
parent 8d9dfd5469
commit c9c5f030d7
1 changed files with 30 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
BizHawk.Emulation/Consoles/PC Engine/VDC.Render.cs
View File

@ -26,20 +26,21 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
public void ExecFrame(bool render)
{
latchedDisplayStartLine = DisplayStartLine;
ActiveLine = 0 - latchedDisplayStartLine;
ScanLine = 0;
for (ScanLine = 0; ScanLine < 263;)
{
latchedDisplayStartLine = DisplayStartLine;
ActiveLine = ScanLine - latchedDisplayStartLine;
int hds = (Registers[HSR] >> 8) & 0x7F;
int hde = (Registers[HDR] >> 8) & 0x7F;
int vds = Registers[VPR] >> 8;
int vsw = Registers[VPR] & 0x1F;
int hds = (Registers[HSR] >> 8) & 0x7F;
int hde = (Registers[HDR] >> 8) & 0x7F;
int vds = Registers[VPR] >> 8;
int vsw = Registers[VPR] & 0x1F;
int VBlankScanline = vds + vsw + Registers[VDW] + 1;
if (VBlankScanline > 261)
VBlankScanline = 261;
int VBlankScanline = vds + vsw + Registers[VDW] + 1;
if (VBlankScanline > 261)
VBlankScanline = 261;
int hblankCycles = (hds + hde + 2) * 8;
int hblankCycles = (hds + hde + 2) * 8;
switch (vce.DotClock)
{
@ -48,12 +49,7 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
case 2: hblankCycles = (hblankCycles*2)/3; break;
}
for (; ScanLine < 263;)
{
//Log.Note("VDC","ScanLine {0} (ActiveLine {1}, RCR {2}, BGY {3})",ScanLine, ActiveLine, RCRCount, BackgroundY);
bool InActiveDisplay = false;
if (ScanLine >= latchedDisplayStartLine && ScanLine < latchedDisplayStartLine + FrameHeight)
InActiveDisplay = true;
if (ActiveLine == 0)
BackgroundY = Registers[BYR];
@ -69,19 +65,32 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
}
cpu.Execute(hblankCycles);
if (InActiveDisplay && render)
RenderScanLine();
bool InActiveDisplay = false;
if (ScanLine >= latchedDisplayStartLine && ScanLine < latchedDisplayStartLine + FrameHeight)
InActiveDisplay = true;
if (InActiveDisplay)
{
if (ActiveLine == 0)
BackgroundY = Registers[BYR];
else
{
BackgroundY++;
BackgroundY &= 0x01FF;
}
if (render) RenderScanLine();
}
if (ScanLine == VBlankScanline && VBlankInterruptEnabled)
StatusByte |= StatusVerticalBlanking;
cpu.Execute(2);
if ((StatusByte & StatusVerticalBlanking) > 0)
cpu.IRQ1Assert = true;
cpu.Execute(455-hblankCycles-2);
cpu.Execute(455 - hblankCycles - 2);
if (ScanLine == VBlankScanline)
UpdateSpriteAttributeTable();
@ -91,8 +100,6 @@ namespace BizHawk.Emulation.Consoles.TurboGrafx
ScanLine++;
ActiveLine++;
BackgroundY++;
BackgroundY &= 0x01FF;
}
}