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gen: implement sprite HFlip and VFlip

This commit is contained in:
beirich 2011-10-16 16:04:08 +00:00
parent f8564bf8a7
commit 7424d370a7
1 changed files with 32 additions and 9 deletions
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41
BizHawk.Emulation/Consoles/Sega/Genesis/GenVDP.Render.cs
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@ -82,6 +82,7 @@ namespace BizHawk.Emulation.Consoles.Sega
{
int scanLineBase = ScanLine * FrameWidth;
int processedSprites = 0;
// This is incredibly unoptimized. TODO...
FetchSprite(0);
while (true)
@ -95,18 +96,34 @@ namespace BizHawk.Emulation.Consoles.Sega
sprite.HeightCells = 2;
int yline = ScanLine - sprite.Y;
if (sprite.VFlip)
yline = sprite.HeightPixels - 1 - yline;
int paletteBase = sprite.Palette * 16;
int pattern = sprite.PatternIndex + ((yline / 8));
int x = sprite.X;
for (int xi = 0; xi < sprite.WidthPixels; xi++)
if (sprite.HFlip == false)
{
if (sprite.X + xi < 0 || sprite.X + xi > FrameWidth)
continue;
int pattern = sprite.PatternIndex + ((yline / 8));
int pixel = PatternBuffer[((pattern+((xi/8)*sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (xi & 7)];
if (pixel != 0)
FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel];
for (int xi = 0; xi < sprite.WidthPixels; xi++)
{
if (sprite.X + xi < 0 || sprite.X + xi > FrameWidth)
continue;
int pixel = PatternBuffer[((pattern + ((xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (xi & 7)];
if (pixel != 0)
FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel];
}
} else { // HFlip
int pattern = sprite.PatternIndex + ((yline / 8)) + (sprite.HeightCells * (sprite.WidthCells - 1));
for (int xi = 0; xi < sprite.WidthPixels; xi++)
{
if (sprite.X + xi < 0 || sprite.X + xi > FrameWidth)
continue;
int pixel = PatternBuffer[((pattern + ((-xi / 8) * sprite.HeightCells)) * 64) + ((yline & 7) * 8) + (7 - (xi & 7))];
if (pixel != 0)
FrameBuffer[scanLineBase + sprite.X + xi] = Palette[paletteBase + pixel];
}
}
nextSprite:
@ -129,7 +146,10 @@ namespace BizHawk.Emulation.Consoles.Sega
sprite.HeightCells = (VRAM[satbase + 3] & 3) + 1;
sprite.Link = VRAM[satbase + 2] & 0x7F;
sprite.PatternIndex = (VRAM[satbase + 4] | (VRAM[satbase + 5] << 8)) & 0x7FF;
sprite.HFlip = ((VRAM[satbase + 5] >> 3) & 1) != 0;
sprite.VFlip = ((VRAM[satbase + 5] >> 4) & 1) != 0;
sprite.Palette = (VRAM[satbase + 5] >> 5) & 3;
sprite.Priority = ((VRAM[satbase + 5] >> 7) & 1) != 0;
}
struct Sprite
@ -140,6 +160,9 @@ namespace BizHawk.Emulation.Consoles.Sega
public int Link;
public int Palette;
public int PatternIndex;
public bool Priority;
public bool HFlip;
public bool VFlip;
}
}
}