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gen: Fix tile VFLIP bug, correcting the most obnoxious of the graphical glitches

This commit is contained in:
beirich 2012-08-24 00:37:54 +00:00
parent 78de49c923
commit 575ceb3966
1 changed files with 1 additions and 5 deletions
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6
BizHawk.Emulation/Consoles/Sega/Genesis/GenVDP.Render.cs
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@ -35,7 +35,6 @@ namespace BizHawk.Emulation.Consoles.Sega
void RenderBackgroundScanline(int xScroll, int yScroll, int nameTableBase, int lowPriority, int highPriority)
{
int yTile = ((ScanLine + yScroll) / 8) % NameTableHeight;
int yOfs = (ScanLine + yScroll) % 8;
// this is hellllla slow. but not optimizing until we implement & understand
// all scrolling modes, shadow & hilight, etc.
@ -45,6 +44,7 @@ namespace BizHawk.Emulation.Consoles.Sega
{
int xTile = Math.Abs(((x + (1024-xScroll)) / 8) % NameTableWidth);
int xOfs = Math.Abs((x + (1024-xScroll)) & 7);
int yOfs = (ScanLine + yScroll) % 8;
int cellOfs = nameTableBase + (yTile * NameTableWidth * 2) + (xTile * 2);
int nameTableEntry = VRAM[cellOfs] | (VRAM[cellOfs+1] << 8);
int patternNo = nameTableEntry & 0x7FF;
@ -72,8 +72,6 @@ namespace BizHawk.Emulation.Consoles.Sega
// todo scroll values
int hscroll = VRAM[HScrollTableAddr + 0] | (VRAM[HScrollTableAddr + 1] << 8);
hscroll &= 0x3FF;
//Console.WriteLine("ScrollA: " + hscroll);
//hscroll = 24;
int vscroll = VSRAM[0] & 0x3FFF;
RenderBackgroundScanline(hscroll, vscroll, NameTableAddrA, 2, 5);
}
@ -82,8 +80,6 @@ namespace BizHawk.Emulation.Consoles.Sega
{
int hscroll = VRAM[HScrollTableAddr + 2] | (VRAM[HScrollTableAddr + 3] << 8);
hscroll &= 0x3FF;
//Console.WriteLine("ScrollB: " + hscroll);
//hscroll = 24;
int vscroll = VSRAM[1] & 0x3FFF;
RenderBackgroundScanline(hscroll, vscroll, NameTableAddrB, 1, 4);
}