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PCE: 50% overall speedup by reworking BG render inner loop

This commit is contained in:
goyuken 2014-02-14 20:24:26 +00:00
parent b7a5b12535
commit af0d5ac59e
1 changed files with 61 additions and 22 deletions
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83
BizHawk.Emulation.Cores/Consoles/PC Engine/VDC.Render.cs
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@ -112,42 +112,81 @@ namespace BizHawk.Emulation.Cores.PCEngine
RenderSpritesScanline(pce.Settings.ShowOBJ1);
}
void RenderBackgroundScanline(bool show)
unsafe void RenderBackgroundScanline(bool show)
{
Array.Clear(PriorityBuffer, 0, FrameWidth);
if (BackgroundEnabled == false)
{
for (int i = 0; i < FrameWidth; i++)
FrameBuffer[(ActiveLine * FramePitch) + i] = vce.Palette[256];
int p = vce.Palette[256];
fixed (int* FBptr = FrameBuffer)
{
int* dst = FBptr + ActiveLine * FramePitch;
for (int i = 0; i < FrameWidth; i++)
*dst++ = p;
}
return;
}
int batHeight = BatHeight * 8;
int batWidth = BatWidth * 8;
// per-line parameters
int vertLine = BackgroundY;
vertLine %= batHeight;
vertLine %= BatHeight * 8;
int yTile = (vertLine / 8);
int yOfs = vertLine % 8;
// This is not optimized. But it seems likely to remain that way.
int xScroll = Registers[BXR] & 0x3FF;
for (int x = 0; x < FrameWidth; x++)
{
int xTile = ((x + xScroll) / 8) % BatWidth;
int xOfs = (x + xScroll) & 7;
int tileNo = VRAM[(ushort)(((yTile * BatWidth) + xTile))] & 2047;
int paletteNo = VRAM[(ushort)(((yTile * BatWidth) + xTile))] >> 12;
int paletteBase = paletteNo * 16;
int BatRowMask = BatWidth - 1;
byte c = PatternBuffer[(tileNo * 64) + (yOfs * 8) + xOfs];
if (c == 0)
FrameBuffer[(ActiveLine * FramePitch) + x] = vce.Palette[0];
else
fixed (ushort* VRAMptr = VRAM)
fixed (int* PALptr = vce.Palette)
fixed (byte* Patternptr = PatternBuffer)
fixed (int* FBptr = FrameBuffer)
fixed (byte* Priortyptr = PriorityBuffer)
{
// pointer to the BAT and the framebuffer for this line
ushort* BatRow = VRAMptr + yTile * BatWidth;
int* dst = FBptr + ActiveLine * FramePitch;
// 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[(ActiveLine * FramePitch) + x] = show ? vce.Palette[paletteBase + c] : vce.Palette[0];
PriorityBuffer[x] = 1;
byte c = *src++;
if (c == 0)
dst[x] = PALptr[0];
else
{
dst[x] = show ? PALptr[paletteBase + c] : PALptr[0];
Priortyptr[x] = 1;
}
xOfs++;
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);
}
}
}
}