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Initial work on 640x480x16 resolution #5

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d8d79e9
Fix clearing screen with back color not working
AnErrupTion May 22, 2021
6dc676a
Initial work on 640x480x16 resolution
AnErrupTion May 22, 2021
fde94c8
Better syntax + add VGAGraphics.Initialize()
AnErrupTion May 22, 2021
15f9a38
Rename Terminal.cs to VGATerminal.cs
AnErrupTion May 22, 2021
dfd7850
Rename to VGATerminal + comment missing function
AnErrupTion May 22, 2021
c49a965
Add files via upload
AnErrupTion May 24, 2021
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6 changes: 1 addition & 5 deletions VGAColor.cs
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Original file line number Diff line number Diff line change
@@ -1,8 +1,4 @@
using System;
using System.Collections.Generic;
using System.Text;

namespace Cosmos.System.Graphics
namespace Cosmos.System.Graphics
{
public enum VGAColor
{
Expand Down
129 changes: 92 additions & 37 deletions VGADriverII.cs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,4 @@
using System;
using System.Collections.Generic;
using System.Text;
using Cosmos.Core;
using Cosmos.Core;
using Cosmos.System.Graphics;

namespace Cosmos.HAL
Expand All @@ -14,6 +11,8 @@ public enum VGAMode
Text90x60,
Pixel320x200,
Pixel320x200DB,
Pixel640x480,
Pixel640x480DB,
}

// vga mode register dumps
Expand Down Expand Up @@ -102,6 +101,27 @@ public static class VGAModeRegisters
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
0x41, 0x00, 0x0F, 0x00, 0x00
};

// pixel 640x480x16
public static byte[] Mode640x480x16_Pixel = new byte[]
{
/* MISC */
0xE3,
/* SEQ */
0x03, 0x01, 0x08, 0x00, 0x06,
/* CRTC */
0x5F, 0x4F, 0x50, 0x82, 0x54, 0x80, 0x0B, 0x3E,
0x00, 0x40, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0xEA, 0x0C, 0xDF, 0x28, 0x00, 0xE7, 0x04, 0xE3,
0xFF,
/* GC */
0x00, 0x00, 0x00, 0x00, 0x03, 0x00, 0x05, 0x0F,
0xFF,
/* AC */
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x14, 0x07,
0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
0x01, 0x00, 0x0F, 0x00, 0x00
};
}

// vga controller class
Expand Down Expand Up @@ -137,7 +157,7 @@ public static unsafe class VGADriverII

// buffer
public static byte* Buffer;
private static MemoryBlock BackBuffer = new MemoryBlock(0x60000, 0x10000);
private static MemoryBlock BackBuffer;

// color palette - 8 bit
public static uint[] Palette256 = new uint[256]
Expand All @@ -164,60 +184,65 @@ public static unsafe class VGADriverII
public static uint[] Palette16 = new uint[16]
{ 0x000000, 0x00001F, 0x001F00, 0x001F1F, 0x1F0000, 0x1F001F, 0x2F1F00, 0x2F2F2F, 0x1F1F1F, 0x00103F, 0x003F00, 0x003F3F, 0x3F0000, 0x3F003F, 0x3F3F00, 0x3F3F3F, };

// initialization
public static void Initialize(VGAMode mode)
{
SetMode(mode);
}

#region Graphics Handling

// clear screen
public static void Clear(byte color)
{
uint i = 0;
// text mode
if (IsTextMode) { for (i = 0; i < (Width * Height) * 2; i += 2) { Buffer[i] = 0x20; Buffer[i + 1] = color; } }
if (IsTextMode)
for (uint i = 0; i < Width * Height * 2; i += 2)
{
Buffer[i] = 0x20;
Buffer[i + 1] = (byte)(color << 4);
}
// graphics mode
else if (!IsTextMode && !IsDoubleBuffered) { for (i = 0; i < Width * Height; i++) { Buffer[i] = color; } }
// double buffered graphics mode
else if (!IsTextMode && IsDoubleBuffered) { BackBuffer.Fill(color); }
else
{
// double buffered
if (IsDoubleBuffered)
BackBuffer.Fill(color);
else
for (uint i = 0; i < Width * Height; i++)
Buffer[i] = color;
}
}

// draw pixel
public static void DrawPixel(ushort x, ushort y, byte color)
{
if (x >= Width || y >= Height) { return; }
if (IsTextMode) { return; }
if (x >= Width || y >= Height || IsTextMode)
return;

uint offset = (uint)(x + (y * Width));

// double buffered
if (IsDoubleBuffered) { BackBuffer.Bytes[offset] = color; }
if (IsDoubleBuffered)
BackBuffer.Bytes[offset] = color;
// direct
else { Buffer[offset] = color; }
else
Buffer[offset] = color;
}

// swap back buffer
public static void Display()
{
// check mode
if (ModeID != VGAMode.Pixel320x200DB) { return; }
// check if double buffered
if (!IsDoubleBuffered)
return;

byte* src = (byte*)BackBuffer.Base;

for (uint i = 0; i < Width * Height; i++)
{
if (*(Buffer + i) != *(src + i))
{
*(Buffer + i) = *(src + i);
}
}
}

// set text-mode cursor position
public static void SetCursorPos(ushort x, ushort y)
{
if (!IsTextMode) { return; }
if (!IsTextMode)
return;
uint offset = (uint)(x + (y * Width));
PORT_CRTC_WRITE.Byte = 14;
PORT_CRTC_DATA.Byte = (byte)((offset & 0xFF00) >> 8);
Expand Down Expand Up @@ -251,6 +276,9 @@ private static void SetModeProperties(ushort w, ushort h, byte depth, bool text,
Width = w; Height = h; Depth = depth;
IsTextMode = text;
IsDoubleBuffered = db;

if (db)
BackBuffer = new MemoryBlock(0x60000, (uint) (Width * Height * Depth));
}

// set current video mode
Expand Down Expand Up @@ -307,12 +335,28 @@ public static void SetMode(VGAMode mode)
SetColorPalette(Palette256);
break;
}
// 640x480 graphics mode
case VGAMode.Pixel640x480:
{
SetModeProperties(640, 480, 4, false, false);
fixed (byte* ptr = VGAModeRegisters.Mode640x480x16_Pixel) { WriteRegisters(ptr); }
ClearColorPalette();
SetColorPalette(Palette16);
break;
}
// 640x480 double buffered graphics mode
case VGAMode.Pixel640x480DB:
{
SetModeProperties(640, 480, 4, false, true);
fixed (byte* ptr = VGAModeRegisters.Mode640x480x16_Pixel) { WriteRegisters(ptr); }
ClearColorPalette();
SetColorPalette(Palette16);
break;
}
// default to 80x25 text mode
default: { break; }
default:
break;
}

// clear the screen
Clear(0);
}

// get frame buffer segment
Expand All @@ -334,10 +378,14 @@ public static void SetMode(VGAMode mode)
private static void WriteRegisters(byte* regs)
{
// misc
PORT_MISC_WRITE.Byte = *(regs++);
PORT_MISC_WRITE.Byte = *regs++;

// sequencer
for (byte i = 0; i < 5; i++) { PORT_SEQ_WRITE.Byte = i; PORT_SEQ_DATA.Byte = *(regs++); }
for (byte i = 0; i < 5; i++)
{
PORT_SEQ_WRITE.Byte = i;
PORT_SEQ_DATA.Byte = *regs++;
}

// crtc
PORT_CRTC_WRITE.Byte = 0x03;
Expand All @@ -348,24 +396,31 @@ private static void WriteRegisters(byte* regs)
// registers
regs[0x03] = (byte)(regs[0x03] | 0x80);
regs[0x11] = (byte)(regs[0x11] & ~0x80);
for (byte i = 0; i < 25; i++) { PORT_CRTC_WRITE.Byte = i; PORT_CRTC_DATA.Byte = *(regs++); }
for (byte i = 0; i < 25; i++)
{
PORT_CRTC_WRITE.Byte = i;
PORT_CRTC_DATA.Byte = *regs++;
}

// graphics controller
for (byte i = 0; i < 9; i++) { PORT_GC_WRITE.Byte = i; PORT_GC_DATA.Byte = *(regs++); }
for (byte i = 0; i < 9; i++)
{
PORT_GC_WRITE.Byte = i;
PORT_GC_DATA.Byte = *regs++;
}

// attribute controller
byte val = 0;
for (byte i = 0; i < 21; i++)
{
val = PORT_INSTAT_READ.Byte;
PORT_AC_WRITE.Byte = i;
PORT_AC_WRITE.Byte = *(regs++);
PORT_AC_WRITE.Byte = *regs++;
}

val = PORT_INSTAT_READ.Byte;
PORT_AC_WRITE.Byte = 0x20;


// set buffer address
Buffer = GetFrameBufferSegment();
}
Expand Down
8 changes: 2 additions & 6 deletions VGAFont.cs
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Original file line number Diff line number Diff line change
@@ -1,12 +1,8 @@
using System;
using System.Collections.Generic;
using System.Text;

namespace Cosmos.System.Graphics
namespace Cosmos.System.Graphics
{
public enum VGAFont
{
Font3x5,
Font3x5,
Font8x8,
Font8x16,
}
Expand Down
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