using System;
namespace NW4RTools {
	public class DisplayListWriter : OutputStream {
		public DisplayListWriter() : base(ByteEndian.BigEndian) {
		}


		public void End() {
			AlignTo(0x20);
		}


		public void Nop() {
			WriteByte(0);
		}

		public void LoadBPReg(UInt32 value) {
			WriteByte((byte)GXCommand.LoadBPReg);
			WriteUInt32(value);
		}

		public void LoadCPReg(byte command, UInt32 value) {
			WriteByte((byte)GXCommand.LoadCPReg);
			WriteByte(command);
			WriteUInt32(value);
		}

		public void LoadXFReg(ushort address, byte[] data) {
			if ((data.Length & 3) != 0) {
				throw new ArgumentException("Data length passed to LoadXFReg() is not aligned to 4 bytes", "data");
			}

			if (data.Length < 4 || data.Length > 0x44) {
				throw new ArgumentException("Data length passed to LoadXFReg() must be at least 4 bytes and at most 0x44 bytes", "data");
			}

			WriteByte((byte)GXCommand.LoadXFReg);
			WriteByte(0);
			WriteByte((byte)((data.Length / 4) - 1));
			WriteUInt16(address);
			WriteBytes(data);
		}

		public void LoadPosMtxFromArray(uint number) {
			WriteByte((byte)GXCommand.LoadPosMtxFromArray);
			WriteUInt32(number);
		}

		public void LoadNrmMtxFromArray(uint number) {
			WriteByte((byte)GXCommand.LoadNrmMtxFromArray);
			WriteUInt32(number);
		}

		public void LoadTexCoordMtxFromArray(uint number) {
			WriteByte((byte)GXCommand.LoadTexCoordMtxFromArray);
			WriteUInt32(number);
		}

		public void LoadLightFromArray(uint number) {
			WriteByte((byte)GXCommand.LoadLightFromArray);
			WriteUInt32(number);
		}

		public void CallDisplayList(uint pointer, uint size) {
			WriteByte((byte)GXCommand.CallDL);
			WriteUInt32(pointer);
			WriteUInt32(size);
		}

		public void UnknownMetrics() {
			WriteByte((byte)GXCommand.UnknownMetrics);
		}

		public void BeginPrimitives(PrimitiveType type, int vatIndex, ushort vtxCount) {
			byte command = (byte)GXCommand.DrawPrimitiveMask;
			command |= (byte)((byte)type << (byte)GXCommand.PrimitiveShiftAmount);
			command |= (byte)vatIndex;
			WriteByte(command);
			WriteUInt16(vtxCount);
		}
	}
}