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namespace Q1Emu.Chip;
using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
public class DisplayDevice : RamDevice
{
public Texture2D? OutputTexture;
private readonly u16 _paletteSize;
private readonly u16 _displayWidth;
private readonly u16 _displayHeight;
public DisplayDevice(u16 paletteSize, u16 displayWidth, u16 displayHeight, u16 addressableStart)
: base(addressableStart, DisplayDevice.DetermineSize(paletteSize, displayWidth, displayHeight))
{
this._paletteSize = paletteSize;
this._displayWidth = displayWidth;
this._displayHeight = displayHeight;
}
private static u16 DetermineSize(u16 paletteSize, u16 displayWidth, u16 displayHeight)
{
return (u16) ((paletteSize * 3) + (displayWidth * displayHeight));
}
public override void Clock()
{
Color[] palette = this.ReadPalette();
ref8 pixelData = this.ReadSeq((u16) (this.AddressableStart + this._paletteSize * 3), (u16) (this._displayWidth * this._displayHeight));
Color[] textureData = new Color[this._displayWidth * this._displayHeight];
for (u16 i = 0; i < textureData.Length; i++)
{
u8 pixelValue = pixelData[i];
textureData[i] = palette[pixelValue];
}
if (this.OutputTexture != null)
this.OutputTexture.SetData(textureData);
}
private Color[] ReadPalette()
{
ref8 paletteData = this.ReadSeq(this.AddressableStart, (u16) (this._paletteSize * 3));
Color[] colors = new Color[this._paletteSize + 1];
colors[0] = Color.Transparent;
for (u16 i = 0; i < this._paletteSize; i++)
{
u16 offset = (u16) (i * 3);
byte r = paletteData[offset];
byte g = paletteData[offset + 1];
byte b = paletteData[offset + 2];
colors[(u16) (i + 1)] = new Color(r, g, b);
}
return colors;
}
public void SetPalette(Color[] palette)
{
if (palette.Length != this._paletteSize)
throw new ArgumentException($"Palette must have {this._paletteSize} colors.");
ref8 paletteData = this.ReadSeq(this.AddressableStart, (u16) (this._paletteSize * 3));
for (u16 i = 0; i < this._paletteSize; i++)
{
u16 offset = (u16) (i * 3);
paletteData[offset] = palette[i].R;
paletteData[offset + 1] = palette[i].G;
paletteData[offset + 2] = palette[i].B;
}
}
}
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