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apply r6102 to SGX. 60% speedup in that arthur game

This commit is contained in:
goyuken 2014-02-14 22:05:57 +00:00
parent af0d5ac59e
commit 7acbcd5995
1 changed files with 54 additions and 14 deletions
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68
BizHawk.Emulation.Cores/Consoles/PC Engine/VPC.cs
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@ -294,31 +294,71 @@ namespace BizHawk.Emulation.Cores.PCEngine
FrameBuffer[(scanline * FrameWidth) + i] = VCE.Palette[256];
}
void RenderBackgroundScanline(VDC vdc, byte priority, bool show)
unsafe void RenderBackgroundScanline(VDC vdc, byte priority, bool show)
{
if (vdc.BackgroundEnabled == false)
return;
// per-line parameters
int vertLine = vdc.BackgroundY;
vertLine %= vdc.BatHeight * 8;
int yTile = (vertLine / 8);
int yOfs = vertLine % 8;
int xScroll = vdc.Registers[BXR] & 0x3FF;
for (int x = 0; x < FrameWidth; x++)
{
if (PriorityBuffer[x] >= priority) continue;
int xTile = ((x + xScroll) / 8) % vdc.BatWidth;
int xOfs = (x + xScroll) & 7;
int tileNo = vdc.VRAM[(ushort)(((yTile * vdc.BatWidth) + xTile))] & 2047;
int paletteNo = vdc.VRAM[(ushort)(((yTile * vdc.BatWidth) + xTile))] >> 12;
int paletteBase = paletteNo * 16;
int BatRowMask = vdc.BatWidth - 1;
byte c = vdc.PatternBuffer[(tileNo * 64) + (yOfs * 8) + xOfs];
if (c != 0)
fixed (ushort* VRAMptr = vdc.VRAM)
fixed (int* PALptr = VCE.Palette)
fixed (byte* Patternptr = vdc.PatternBuffer)
fixed (int* FBptr = FrameBuffer)
fixed (byte* Priortyptr = PriorityBuffer)
{
// pointer to the BAT and the framebuffer for this line
ushort* BatRow = VRAMptr + yTile * vdc.BatWidth;
int* dst = FBptr + vdc.ActiveLine * FrameWidth;
// parameters that change per tile
ushort BatEnt;
int tileNo, paletteNo, paletteBase;
byte* src;
// calculate tile number and offset for first tile
int xTile = (xScroll >> 3) & BatRowMask;
int xOfs = xScroll & 7;
// update per-tile parameters for first tile
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
for (int x = 0; x < FrameWidth; x++)
{
FrameBuffer[(vdc.ActiveLine * FrameWidth) + x] = show ? VCE.Palette[paletteBase + c] : VCE.Palette[0];
PriorityBuffer[x] = priority;
if (Priortyptr[x] < priority)
{
byte c = *src;
if (c != 0)
{
dst[x] = show ? PALptr[paletteBase + c] : PALptr[0];
Priortyptr[x] = priority;
}
}
xOfs++;
src++;
if (xOfs == 8)
{
// update tile number
xOfs = 0;
xTile++;
xTile &= BatRowMask;
// update per-tile parameters
BatEnt = BatRow[xTile];
tileNo = BatEnt & 2047;
paletteNo = BatEnt >> 12;
paletteBase = paletteNo * 16;
src = Patternptr + (tileNo << 6 | yOfs << 3 | xOfs);
}
}
}
}