/// <summary>
/// Implement dynamic hardware palette sizing
///
/// The HardwarePalette will now grow its palette buffer and texture in power-of-2 increments..
/// This avoids it having to allocate memory for a full 256*256 texture up front.
/// In practice the default mods use 22 or 23 paleetes so a 32X256 texture is used.
/// This means both the buffer and texture save neatly on memory.
/// Additionally, HarewarePalette.ApplyModifiers sees a nice speedup as it has to transfer a much smaller amount of memory from the buffer to the texture
///
/// to facilitate this change,the MaxPalettes constant is no more.
/// instead the PaletteReference deals with the calculation of the index and this is passed into the appropriate methods.
///
/// 实现动态的调色板寄存
///
/// HardwarePalette 现在以2的幂次增加其调色板的缓冲区和纹理大小。这避免了它必须先分配内存以获得完整的256x256纹理。
/// 实际上默认的mod 使用22或者23种调色板，因此使用了32x256的纹理。这意味着缓冲区和纹理整齐的保存在内存当中。
/// 此外HardwarePalette.ApplyModifiers 有着一个不错的加速，因为它必须从字节缓冲区传递少量的内存到纹理。
///
/// 为了促进这种变化。MaxPalettes 常数不再。PaletteReference处理调色板索引的计算，并将其传递给适当的方法。
/// </summary>
/// <param name="name"></param>
/// <param name="p"></param>
/// <param name="allowModifiers"></param>
public void AddPalette(string name, ImmutablePalette p, bool allowModifiers)
{
if (palettes.ContainsKey(name))
{
throw new InvalidOperationException("Palette {0} has already benn defined.".F(name));
}
int index = palettes.Count;
indices.Add(name, index);
palettes.Add(name, p);
if (palettes.Count > Height)
{
//以2的增量增加调色板缓冲区和纹理，
Height = Exts.NextPowerOf2(palettes.Count);
Array.Resize(ref buffer, Height * Palette.Size * 4);
}
if (allowModifiers)
{
modifiablePalettes.Add(name, new MutablePalette(p));
}
else
{
CopyPaletteToBuffer(index, p);
}
}
/// <summary>
/// 添加调色板
/// </summary>
/// <param name="name"></param>
/// <param name="pal"></param>
/// <param name="allowModifiers"></param>
/// <param name="allowOverwrite"></param>
public void AddPalette(string name, ImmutablePalette pal, bool allowModifiers = false, bool allowOverwrite = false)
{
if (allowOverwrite && palette.Contains(name))
{
ReplacePalette(name, pal);
}
else
{
var oldHeight = palette.Height;
palette.AddPalette(name, pal, allowModifiers);
if (oldHeight != palette.Height && PaletteInvalidated != null)
{
PaletteInvalidated();
}
}
}
/// <summary>
/// 替换调色板
/// </summary>
/// <param name="name"></param>
/// <param name="p"></param>
public void ReplacePalette(string name, IPalette p)
{
if (modifiablePalettes.ContainsKey(name))
{
CopyPaletteToBuffer(indices[name], modifiablePalettes[name] = new MutablePalette(p));
}
else if (palettes.ContainsKey(name))
{
CopyPaletteToBuffer(indices[name], palettes[name] = new ImmutablePalette(p));
}
else
{
throw new InvalidOperationException("Palette '{0}' does not exist".F(name));
}
CopyBufferToTexture();
}