public static int[] LoadLUT(BasicMemory VKY)
{
// Read the color lookup tables
int lutAddress = MemoryMap.GRP_LUT_BASE_ADDR - MemoryMap.VICKY_BASE_ADDR;
int lookupTables = 4;
int[] result = new int[lookupTables * 256];
for (int c = 0; c < lookupTables * 256; c++)
{
byte blue = VKY.ReadByte(lutAddress++);
byte green = VKY.ReadByte(lutAddress++);
byte red = VKY.ReadByte(lutAddress++);
lutAddress++;
result[c] = (0xFF << 24) + (red << 16) + (green << 8) + blue;
}
return(result);
}
/// <summary>
/// Returns a single row (byte) in the character data.
/// </summary>
/// <param name="CharacterCode">Character code</param>
/// <param name="Row">Row in glpyh</param>
/// <returns></returns>
public byte Read(int CharacterCode, int Row)
{
if (CharacterData == null)
{
return(0);
}
int addr = StartAddress + CharacterCode * charHeight + Row;
return(CharacterData.ReadByte(addr));
}
void Gpu_Paint(object sender, PaintEventArgs e)
{
paintCycle++;
if (VICKY == null)
{
e.Graphics.DrawString("IO Memory Not Initialized", this.Font, TextBrush, 0, 0);
return;
}
//if (VRAM == null)
//{
// e.Graphics.DrawString("VRAM Not Initialized", this.Font, TextBrush, 0, 0);
// return;
//}
//if (RAM == null || DesignMode)
if (DesignMode)
{
e.Graphics.DrawString("RAM Not Initialized", this.Font, TextBrush, 0, 0);
return;
}
// Read the Master Control Register
byte MCRegister = VICKY.ReadByte(0); // Reading address $AF:0000
if (MCRegister == 0 || (MCRegister & 0x80) == 0x80)
{
e.Graphics.DrawString("Graphics Mode disabled", this.Font, TextBrush, 0, 0);
return;
}
if (drawing)
{
return;
}
drawing = true;
e.Graphics.CompositingMode = System.Drawing.Drawing2D.CompositingMode.SourceCopy;
e.Graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighSpeed;
e.Graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.NearestNeighbor;
e.Graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighSpeed;
if (MCRegister != 0 && MCRegister != 0x80)
{
StartOfFrame?.Invoke();
}
Graphics g = Graphics.FromImage(frameBuffer);
// Determine if we display a border
int border_register = VICKY.ReadByte(4);
bool displayBorder = (border_register & 1) == 1;
int colOffset = VICKY.ReadByte(8);
int rowOffset = VICKY.ReadByte(9);
// Load Graphical LUTs
graphicsLUT = LoadLUT(VICKY);
// Apply gamma correct
if ((MCRegister & 0x40) == 0x40)
{
gammaCorrection = LoadGammaCorrection(VICKY);
}
else
{
gammaCorrection = null;
}
// Default background color to border color
// In Text mode, the border color is stored at $AF:0005.
byte borderRed = VICKY.ReadByte(5);
byte borderGreen = VICKY.ReadByte(6);
byte borderBlue = VICKY.ReadByte(7);
if (gammaCorrection != null)
{
borderRed = gammaCorrection[0x200 + borderRed];
borderGreen = gammaCorrection[0x100 + borderGreen];
borderBlue = gammaCorrection[borderBlue];
}
int borderColor = (int)(0xFF000000 + (borderBlue << 16) + (borderGreen << 8) + borderRed);
if (tileEditorMode)
{
g.Clear(Color.LightGray);
DrawTextWithBackground("Tile Editing Mode", g, Color.Black, 240, 10);
DrawTextWithBackground("Tile Editing Mode", g, Color.Black, 240, 455);
}
else
{
g.Clear(Color.FromArgb(borderColor));
}
// Graphics Mode
if ((MCRegister & 0x4) == 0x4)
{
byte backRed = VICKY.ReadByte(0xD);
byte backGreen = VICKY.ReadByte(0XE);
byte backBlue = VICKY.ReadByte(0xF);
if (gammaCorrection != null)
{
backRed = gammaCorrection[0x200 + backRed];
backGreen = gammaCorrection[0x100 + backGreen];
backBlue = gammaCorrection[backBlue];
}
int backgroundColor = (int)(0xFF000000 + (backBlue << 16) + (backGreen << 8) + backRed);
Brush graphBackgroundBrush = new SolidBrush(Color.FromArgb(backgroundColor));
g.FillRectangle(graphBackgroundBrush, colOffset, rowOffset, 640 - 2 * colOffset, 480 - 2 * rowOffset);
}
// Bitmap Mode
if ((MCRegister & 0x8) == 0x8)
{
DrawBitmap(frameBuffer, displayBorder);
}
for (int layer = 4; layer > 0; --layer)
{
if ((MCRegister & 0x10) == 0x10)
{
DrawTiles(frameBuffer, layer - 1, displayBorder);
}
if ((MCRegister & 0x20) == 0x20)
{
DrawSprites(frameBuffer, layer - 1, displayBorder);
}
}
if ((MCRegister & 0x1) == 0x1)
{
int top = 0;
if (ColumnsVisible < 1 || ColumnsVisible > MAX_TEXT_COLS)
{
Graphics graphics = Graphics.FromImage(frameBuffer);
DrawTextWithBackground("ColumnsVisible invalid:" + ColumnsVisible.ToString(), graphics, Color.Black, 0, top);
top += 12;
}
if (LinesVisible < 1 || LinesVisible > MAX_TEXT_LINES)
{
Graphics graphics = Graphics.FromImage(frameBuffer);
DrawTextWithBackground("LinesVisible invalid:" + LinesVisible.ToString(), graphics, Color.Black, 0, top);
top += 12;
}
if (top == 0)
{
DrawBitmapText(frameBuffer, colOffset, rowOffset);
}
}
byte mouseReg = VICKY.ReadByte(0x700);
MousePointerMode = (mouseReg & 1) == 1;
if (MousePointerMode && !TileEditorMode)
{
DrawMouse(frameBuffer);
}
e.Graphics.DrawImage(frameBuffer, ClientRectangle);
drawing = false;
}