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Atari 2600 TIA: added support for delayed graphics 

sketchily implemented cloning, enough to get pitfall to render
This commit is contained in:
pjgat09 2012-03-11 08:43:45 +00:00
parent 23cb513188
commit c72eef1abc
1 changed files with 124 additions and 2 deletions
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126
BizHawk.Emulation/Consoles/Atari/2600/TIA.cs
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@ -17,6 +17,7 @@ namespace BizHawk.Emulation.Consoles.Atari
struct playerData
{
public byte grp;
public byte dgrp;
public byte color;
public byte pos;
public byte HM;
@ -39,6 +40,14 @@ namespace BizHawk.Emulation.Consoles.Atari
playerData player0;
playerData player1;
byte player0copies = 0;
byte player0copy1 = 0;
byte player0copy2 = 0;
byte player1copies = 0;
byte player1copy1 = 0;
byte player1copy2 = 0;
bool vblankEnabled = false;
@ -143,7 +152,40 @@ namespace BizHawk.Emulation.Consoles.Atari
{
mask = reverseBits(mask);
}
if ((player1.grp & mask) != 0)
if (((player1.grp & mask) != 0 && !player1.delay) || ((player1.dgrp & mask) != 0 && player1.delay))
{
color = palette[player1.color];
}
}
byte pos = (byte)(player1.pos + player1copy1);
// Player copy 1
if (player1copies >= 1 && pixelPos >= pos && pixelPos < (pos + 8))
{
byte mask = (byte)(0x80 >> (pixelPos - pos));
if (player1.reflect)
{
mask = reverseBits(mask);
}
if (((player1.grp & mask) != 0 && !player1.delay) || ((player1.dgrp & mask) != 0 && player1.delay))
{
color = palette[player1.color];
}
}
pos = (byte)(player1.pos + player1copy2);
// Player copy 2
if (player1copies >=2 && pixelPos >= pos && pixelPos < (pos + 8))
{
byte mask = (byte)(0x80 >> (pixelPos - pos));
if (player1.reflect)
{
mask = reverseBits(mask);
}
if (((player1.grp & mask) != 0 && !player1.delay) || ((player1.dgrp & mask) != 0 && player1.delay))
{
color = palette[player1.color];
}
@ -157,7 +199,39 @@ namespace BizHawk.Emulation.Consoles.Atari
{
mask = reverseBits(mask);
}
if ((player0.grp & mask) != 0)
if (((player0.grp & mask) != 0 && !player0.delay) || ((player0.dgrp & mask) != 0 && player0.delay))
{
color = palette[player0.color];
}
}
pos = (byte)(player0.pos + player0copy1);
// Player copy 1
if (player0copies >= 1 && pixelPos >= pos && pixelPos < (pos + 8))
{
byte mask = (byte)(0x80 >> (pixelPos - pos));
if (player0.reflect)
{
mask = reverseBits(mask);
}
if (((player0.grp & mask) != 0 && !player0.delay) || ((player0.dgrp & mask) != 0 && player0.delay))
{
color = palette[player0.color];
}
}
pos = (byte)(player0.pos + player0copy2);
// Player copy 1
if (player0copies >= 2 && pixelPos >= pos && pixelPos < (pos + 8))
{
byte mask = (byte)(0x80 >> (pixelPos - pos));
if (player0.reflect)
{
mask = reverseBits(mask);
}
if (((player0.grp & mask) != 0 && !player0.delay) || ((player0.dgrp & mask) != 0 && player0.delay))
{
color = palette[player0.color];
}
@ -251,6 +325,44 @@ namespace BizHawk.Emulation.Consoles.Atari
execute(1);
}
}
else if (maskedAddr == 0x04) // NUSIZ0
{
byte size = (byte)(value & 0x07);
switch (size)
{
case 0x00:
player0copies = 0;
break;
case 0x02:
player0copies = 1;
player0copy1 = 32;
break;
case 0x03:
player0copies = 2;
player0copy1 = 16;
player0copy2 = 32;
break;
}
}
else if (maskedAddr == 0x05) // NUSIZ1
{
byte size = (byte)(value & 0x07);
switch (size)
{
case 0x00:
player1copies = 0;
break;
case 0x02:
player1copies = 1;
player1copy1 = 32;
break;
case 0x03:
player1copies = 2;
player1copy1 = 16;
player1copy2 = 32;
break;
}
}
else if (maskedAddr == 0x06) // COLUP0
{
player0.color = value;
@ -308,10 +420,12 @@ namespace BizHawk.Emulation.Consoles.Atari
else if (maskedAddr == 0x1B) // GRP0
{
player0.grp = value;
player1.dgrp = player1.grp;
}
else if (maskedAddr == 0x1C) // GRP1
{
player1.grp = value;
player0.dgrp = player0.grp;
}
else if (maskedAddr == 0x1F) // ENABL
{
@ -329,6 +443,14 @@ namespace BizHawk.Emulation.Consoles.Atari
{
ball.HM = (byte)((value & 0xF0) >> 4);
}
else if (maskedAddr == 0x25) // VDELP0
{
player0.delay = (value & 0x01) != 0;
}
else if (maskedAddr == 0x26) // VDELP1
{
player1.delay = (value & 0x01) != 0;
}
else if (maskedAddr == 0x2A) // HMOVE
{
player0.pos = (byte)(player0.pos + hmove[player0.HM]);