From 7c532fbd01eff571a5ecfd561748c87dacd22b65 Mon Sep 17 00:00:00 2001
From: saxxonpike <saxxonpike@gmail.com>
Date: Thu, 15 Aug 2013 09:49:38 +0000
Subject: [PATCH] Commodore64: Experimental video chip things.

---
 BizHawk.Emulation/BizHawk.Emulation.csproj    |   4 +
 .../Commodore64/Experimental/MOS6569.cs       |  14 ++
 .../Commodore64/Experimental/Vic.Interface.cs | 126 ++++++++++++++++++
 .../Commodore64/Experimental/Vic.Internal.cs  |  52 ++++++++
 .../Commodore64/Experimental/Vic.Rom.cs       |  11 ++
 5 files changed, 207 insertions(+)
 create mode 100644 BizHawk.Emulation/Computers/Commodore64/Experimental/MOS6569.cs
 create mode 100644 BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Interface.cs
 create mode 100644 BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Internal.cs
 create mode 100644 BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Rom.cs

diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 2af4bec652..3e270dcca8 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -98,6 +98,10 @@
     <Compile Include="Computers\Commodore64\Cartridge\Mapper0020.cs" />
     <Compile Include="Computers\Commodore64\Disk\VIC1541.cs" />
     <Compile Include="Computers\Commodore64\Disk\VIC1541.PLA.cs" />
+    <Compile Include="Computers\Commodore64\Experimental\MOS6569.cs" />
+    <Compile Include="Computers\Commodore64\Experimental\Vic.Interface.cs" />
+    <Compile Include="Computers\Commodore64\Experimental\Vic.Internal.cs" />
+    <Compile Include="Computers\Commodore64\Experimental\Vic.Rom.cs" />
     <Compile Include="Computers\Commodore64\Media\PRG.cs" />
     <Compile Include="Computers\Commodore64\Cartridge\Cart.cs" />
     <Compile Include="Computers\Commodore64\MOS\CartridgePort.cs" />
diff --git a/BizHawk.Emulation/Computers/Commodore64/Experimental/MOS6569.cs b/BizHawk.Emulation/Computers/Commodore64/Experimental/MOS6569.cs
new file mode 100644
index 0000000000..090587e1b2
--- /dev/null
+++ b/BizHawk.Emulation/Computers/Commodore64/Experimental/MOS6569.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Computers.Commodore64.Experimental
+{
+    public class MOS6569 : VIC
+    {
+        public MOS6569()
+        {
+        }
+    }
+}
diff --git a/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Interface.cs b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Interface.cs
new file mode 100644
index 0000000000..bbd0041fc0
--- /dev/null
+++ b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Interface.cs
@@ -0,0 +1,126 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Computers.Commodore64.Experimental
+{
+    public abstract partial class VIC
+    {
+        public Func<int> InputAddress;
+        public Func<bool> InputChipSelect;
+        public Func<int> InputData;
+
+        class Sprite
+        {
+            public int Color;
+            public bool DataCollision;
+            public bool Enabled;
+            public bool ExpandX;
+            public bool ExpandY;
+            public bool Multicolor;
+            public bool Priority;
+            public bool SpriteCollision;
+            public int X;
+            public int Y;
+        }
+
+        int[] backgroundColor;
+        bool bitmapMode;
+        int borderColor;
+        int characterBitmap;
+        bool columnSelect;
+        bool dataCollisionInterrupt;
+        bool displayEnable;
+        bool extraColorMode;
+        byte interruptEnableRegister;
+        bool lightPenInterrupt;
+        int lightPenX;
+        int lightPenY;
+        bool multiColorMode;
+        bool rasterInterrupt;
+        int rasterX;
+        int rasterY;
+        bool reset;
+        bool rowSelect;
+        bool spriteCollisionInterrupt;
+        int[] spriteMultiColor;
+        Sprite[] sprites;
+        int videoMemory;
+        int xScroll;
+        int yScroll;
+
+        public VIC()
+        {
+            backgroundColor = new int[4];
+            spriteMultiColor = new int[2];
+            sprites = new Sprite[8];
+            for (int i = 0; i < 8; i++)
+                sprites[i] = new Sprite();
+        }
+
+        /// <summary>
+        /// Desired 14-bit address from the VIC.
+        /// </summary>
+        public int OutputAddress()
+        {
+            return ADDR;
+        }
+
+        /// <summary>
+        /// AEC pin output.
+        /// </summary>
+        public bool OutputAEC()
+        {
+            return AEC;
+        }
+
+        /// <summary>
+        /// BA pin output.
+        /// </summary>
+        public bool OutputBA()
+        {
+            return BA;
+        }
+
+        /// <summary>
+        /// CAS pin output.
+        /// </summary>
+        public bool OutputCAS()
+        {
+            return CAS;
+        }
+
+        /// <summary>
+        /// 12-bit data output from the VIC.
+        /// </summary>
+        public int OutputData()
+        {
+            return DATA;
+        }
+
+        /// <summary>
+        /// IRQ pin output.
+        /// </summary>
+        public bool OutputInterrupt()
+        {
+            return IRQ;
+        }
+
+        /// <summary>
+        /// PHI0 pin output.
+        /// </summary>
+        public bool OutputPHI0()
+        {
+            return PHI0;
+        }
+
+        /// <summary>
+        /// RAS pin output.
+        /// </summary>
+        public bool OutputRAS()
+        {
+            return RAS;
+        }
+    }
+}
diff --git a/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Internal.cs b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Internal.cs
new file mode 100644
index 0000000000..a72f11e794
--- /dev/null
+++ b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Internal.cs
@@ -0,0 +1,52 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Computers.Commodore64.Experimental
+{
+    public partial class VIC
+    {
+        int ADDR;
+        bool AEC;
+        bool BA;
+        bool CAS;
+        int DATA;
+        bool IRQ;
+        bool PHI0;
+        bool RAS;
+
+        bool badLineCondition;
+        bool badLineEnable;
+        bool idleState;
+        int pixelTimer;
+        int rowCounter;
+        int videoCounter;
+        int videoCounterBase;
+        int videoMatrixLineIndex;
+
+        public void Execute()
+        {
+            if (pixelTimer == 0)
+            {
+                PHI0 = !PHI0;
+                pixelTimer = 8;
+
+                badLineEnable |= (rasterY == 0x30 && displayEnable);
+                if (!PHI0)
+                {
+                    badLineCondition = (
+                        badLineEnable && 
+                        rasterY >= 0x030 && 
+                        rasterY <= 0x0F7 && 
+                        (rasterY & 0x007) == yScroll
+                        );
+                    if (!idleState && badLineCondition)
+                        idleState = true;
+                }
+            }
+            pixelTimer--;
+
+        }
+    }
+}
diff --git a/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Rom.cs b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Rom.cs
new file mode 100644
index 0000000000..383f8be5e3
--- /dev/null
+++ b/BizHawk.Emulation/Computers/Commodore64/Experimental/Vic.Rom.cs
@@ -0,0 +1,11 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace BizHawk.Emulation.Computers.Commodore64.Experimental
+{
+    public partial class Vic
+    {
+    }
+}