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commodore64: fill in fetch code

This commit is contained in:
saxxonpike 2012-11-27 06:21:46 +00:00
parent 95d228f413
commit 178e1a4518
1 changed files with 127 additions and 29 deletions
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156
BizHawk.Emulation/Computers/Commodore64/MOS/Vic.cs
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@ -14,6 +14,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
public bool collideData;
public bool collideSprite;
public uint color;
public bool display;
public bool dma;
public bool enable;
public uint mc;
public uint mcbase;
@ -24,6 +26,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
public uint x;
public bool xExpand;
public uint y;
public bool yCrunch;
public bool yExpand;
public void HardReset()
@ -31,6 +34,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
collideData = false;
collideSprite = false;
color = 0;
display = false;
dma = false;
enable = false;
mc = 0;
mcbase = 0;
@ -41,6 +46,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
x = 0;
xExpand = false;
y = 0;
yCrunch = false;
yExpand = false;
}
}
@ -54,11 +60,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
private bool badline;
private bool badlineEnable;
private bool bitmapMode;
private uint borderB;
private bool borderCheckLEnable;
private bool borderCheckREnable;
private uint borderColor;
private uint borderL;
private bool borderOnMain;
private bool borderOnVertical;
private uint borderR;
private uint borderT;
private uint[] bufferC;
private uint[] bufferG;
private byte bus;
@ -197,6 +207,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
bufferC[i] = 0;
bufferG[i] = 0;
}
UpdateBorder();
}
private void UpdateBA()
@ -207,6 +219,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
baCount--;
}
private void UpdateBorder()
{
borderL = columnSelect ? (uint)0x018 : (uint)0x01F;
borderR = columnSelect ? (uint)0x158 : (uint)0x14F;
borderT = rowSelect ? (uint)0x033 : (uint)0x037;
borderB = rowSelect ? (uint)0x0FB : (uint)0x0F7;
}
private void UpdatePins()
{
pinIRQ = !(
@ -254,9 +274,20 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
if (badlineEnable && rasterLine >= 0x030 && rasterLine < 0x0F7 && ((rasterLine & 0x7) == yScroll))
badline = true;
// go into display state on a badline
if (badline)
idle = false;
// process some sprite crunch vars
if (!sprites[0].yExpand) sprites[0].yCrunch = true;
if (!sprites[1].yExpand) sprites[1].yCrunch = true;
if (!sprites[2].yExpand) sprites[2].yCrunch = true;
if (!sprites[3].yExpand) sprites[3].yCrunch = true;
if (!sprites[4].yExpand) sprites[4].yCrunch = true;
if (!sprites[5].yExpand) sprites[5].yCrunch = true;
if (!sprites[6].yExpand) sprites[6].yCrunch = true;
if (!sprites[7].yExpand) sprites[7].yCrunch = true;
ParseCycle();
Render();
@ -273,6 +304,11 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
cycle++;
if (cycle == totalCycles)
{
if (rasterLine == borderB)
borderOnVertical = true;
if (rasterLine == borderT && displayEnable)
borderOnVertical = false;
vcbase = 0;
cycleIndex = 0;
cycle = 0;
@ -324,6 +360,8 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
addr = (ushort)((pointerVM << 10) | vc);
bus = chips.pla.ReadVic(addr);
dataC = bus;
dataC |= (uint)chips.colorRam.Read((ushort)vc) << 8;
bufferC[vmli] = dataC;
}
else
{
@ -344,14 +382,14 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
if (bitmapMode)
addr = (ushort)(rc | (vc << 3) | ((pointerCB & 0x4) << 11));
else
addr = (ushort)(rc | (dataG << 3) | (pointerCB << 9));
addr = (ushort)(rc | ((dataC & 0xFF) << 3) | (pointerCB << 11));
}
if (extraColorMode)
addr &= 0x39FF;
bus = chips.pla.ReadVic(addr);
dataG = bus;
vmli++;
vc++;
vmli = (vmli + 1) & 0x3F;
vc = (vc + 1) & 0x3FF;
break;
case 0x0400:
// fetch I
@ -377,10 +415,15 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
case 0x20:
case 0x30:
// fetch S
addr = (ushort)(sprites[cycleFetchSpriteIndex].mc | sprites[cycleFetchSpriteIndex].pointer << 6);
bus = chips.pla.ReadVic(addr);
sprites[cycleFetchSpriteIndex].sr <<= 8;
sprites[cycleFetchSpriteIndex].sr |= bus;
if (sprites[cycleFetchSpriteIndex].dma)
{
Sprite spr = sprites[cycleFetchSpriteIndex];
addr = (ushort)(spr.mc | (spr.pointer << 6));
bus = chips.pla.ReadVic(addr);
spr.sr <<= 8;
spr.sr |= bus;
spr.mc++;
}
break;
}
break;
@ -399,39 +442,86 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
cycleBAsprite0 = ba & 0x000F;
cycleBAsprite1 = ba & 0x00F0;
cycleBAsprite2 = ba & 0x0F00;
if ((cycleBAsprite0 < 8 && sprites[cycleBAsprite0].enable) ||
(cycleBAsprite1 < 8 && sprites[cycleBAsprite1].enable) ||
(cycleBAsprite2 < 8 && sprites[cycleBAsprite2].enable))
if ((cycleBAsprite0 < 8 && sprites[cycleBAsprite0].dma) ||
(cycleBAsprite1 < 8 && sprites[cycleBAsprite1].dma) ||
(cycleBAsprite2 < 8 && sprites[cycleBAsprite2].dma))
pinBA = false;
break;
}
// perform actions
borderCheckLEnable = false;
borderCheckREnable = false;
borderCheckLEnable = true;
borderCheckREnable = true;
if (!columnSelect && (act & pipelineChkBrdL0) != 0)
borderCheckLEnable = true;
if (columnSelect && (act & pipelineChkBrdL1) != 0)
borderCheckLEnable = true;
if (!columnSelect && (act & pipelineChkBrdR0) != 0)
borderCheckREnable = true;
if (columnSelect && (act & pipelineChkBrdR1) != 0)
borderCheckREnable = true;
//if (!columnSelect && (act & pipelineChkBrdL0) != 0)
// borderCheckLEnable = true;
//if (columnSelect && (act & pipelineChkBrdL1) != 0)
// borderCheckLEnable = true;
//if (!columnSelect && (act & pipelineChkBrdR0) != 0)
// borderCheckREnable = true;
//if (columnSelect && (act & pipelineChkBrdR1) != 0)
// borderCheckREnable = true;
if ((act & pipelineChkSprChunch) != 0)
{
for (int i = 0; i < 8; i++)
{
Sprite spr = sprites[i];
if (spr.yCrunch)
spr.mcbase += 2;
}
}
if ((act & pipelineChkSprDisp) != 0)
{
for (int i = 0; i < 8; i++)
{
Sprite spr = sprites[i];
spr.mc = spr.mcbase;
if (spr.dma && spr.y == (rasterLine & 0xFF))
{
spr.display = true;
}
}
}
if ((act & pipelineChkSprDma) != 0)
{
for (int i = 0; i < 8; i++)
{
Sprite spr = sprites[i];
if (spr.enable && spr.y == (rasterLine & 0xFF) && !spr.dma)
{
spr.dma = true;
spr.mcbase = 0;
if (spr.yExpand)
spr.yCrunch = false;
}
}
}
if ((act & pipelineChkSprExp) != 0)
{
if (sprites[0].yExpand) sprites[0].yCrunch ^= true;
if (sprites[1].yExpand) sprites[1].yCrunch ^= true;
if (sprites[2].yExpand) sprites[2].yCrunch ^= true;
if (sprites[3].yExpand) sprites[3].yCrunch ^= true;
if (sprites[4].yExpand) sprites[4].yCrunch ^= true;
if (sprites[5].yExpand) sprites[5].yCrunch ^= true;
if (sprites[6].yExpand) sprites[6].yCrunch ^= true;
if (sprites[7].yExpand) sprites[7].yCrunch ^= true;
}
if ((act & pipelineUpdateMcBase) != 0)
{
for (int i = 0; i < 8; i++)
{
Sprite spr = sprites[i];
if (spr.yCrunch)
{
spr.mcbase++;
if (spr.mcbase == 63)
{
spr.dma = false;
spr.display = false;
}
}
}
}
if ((act & pipelineUpdateRc) != 0)
{
@ -441,7 +531,7 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
vcbase = vc;
}
if (!idle)
rc++;
rc = (rc + 1) & 0x7;
}
if ((act & pipelineUpdateVc) != 0)
{
@ -456,16 +546,24 @@ namespace BizHawk.Emulation.Computers.Commodore64.MOS
private void Render()
{
if (borderCheckLEnable)
for (int i = 0; i < 4; i++)
{
if (borderCheckLEnable && rasterX == borderL)
{
if (rasterLine == borderB)
borderOnVertical = true;
if (rasterLine == borderT && displayEnable)
borderOnVertical = false;
if (!borderOnVertical)
borderOnMain = false;
}
if (borderCheckREnable && rasterX == borderR)
{
borderOnMain = true;
}
WritePixel(backgroundColor0);
rasterX++;
}
if (borderCheckREnable)
{
}
WritePixel(0);
WritePixel(0);
WritePixel(0);
WritePixel(0);
}
// ------------------------------------