private void DrawTiles(Bitmap bitmap, int layer, bool bkgrnd)
{
// There are four possible tilesets to choose from
int addrTileset = MemoryMap.TILE_CONTROL_REGISTER_ADDR + layer * 8;
int reg = VICKY.ReadByte(addrTileset - MemoryMap.VICKY_BASE_ADDR);
// if the set is not enabled, we're done.
if ((reg & 0x01) == 00)
{
return;
}
// This is hard coded for now
int lines = 52;
int lutIndex = (reg & 14) >> 1; // 8 possible LUTs
bool striding = (reg & 0x80) == 0x80;
int tilesetAddress = VICKY.ReadLong(addrTileset + 1 - MemoryMap.VICKY_BASE_ADDR);
int strideX = VICKY.ReadWord(addrTileset + 4 - MemoryMap.VICKY_BASE_ADDR);
int strideY = VICKY.ReadWord(addrTileset + 6 - MemoryMap.VICKY_BASE_ADDR);
// Now read the tilemap
int tilemapAddress = 0xAF5000 + 0x800 * layer;
BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, 16, 16), ImageLockMode.WriteOnly, PixelFormat.Format32bppArgb);
IntPtr p = bitmapData.Scan0;
int colOffset = bkgrnd ? (80 - ColumnsVisible) / 2 * charWidth / tileSize : 0;
int lineOffset = bkgrnd ? (60 - lines) / 2 * charHeight / tileSize : 0;
for (int tileRow = lineOffset; tileRow < (30 - lineOffset); tileRow++)
{
for (int tileCol = colOffset; tileCol < (40 - colOffset); tileCol++)
{
int tile = VICKY.ReadByte(tilemapAddress + tileCol + tileRow * 64 - MemoryMap.VICKY_BASE_ADDR);
int pixelIndex = 0;
int value = 0;
// Tiles are 16 x 16
for (int line = 0; line < 16; line++)
{
for (int col = 0; col < 16; col++)
{
// Lookup the pixel in the tileset
//pixelIndex = VRAM.ReadByte(tilesetAddress + ((tile / 16) * 256 * 16 + (tile % 16) * 16) + col + line * strideX);
//fix split out static video start address value
pixelIndex = FoenixSystem.Current.MemoryManager.ReadByte(MemoryMap.VIDEO_START + tilesetAddress + ((tile / 16) * 256 * 16 + (tile % 16) * 16) + col + line * strideX);
if (pixelIndex != 0)
{
value = (int)graphicsLUT[lutIndex * 256 + pixelIndex];
if (gammaCorrection != null)
{
//value = (int)((blue << 16) + (green << 8) + red + 0xFF000000);
value = (int)((gammaCorrection[(value & 0x00FF0000) >> 0x10] << 0x10) +
(gammaCorrection[0x100 + ((value & 0x0000FF00) >> 0x08)] << 0x08) +
(gammaCorrection[0x200 + (value & 0x000000FF)]) + 0xFF000000);
}
System.Runtime.InteropServices.Marshal.WriteInt32(p, (line * bitmap.Width + col + tileCol * 16 + tileRow * 16 * 640) * 4, value);
}
}
}
}
}
bitmap.UnlockBits(bitmapData);
}
