40 lines
1.0 KiB
C#
40 lines
1.0 KiB
C#
// <copyright file="CharacterDefinition.cs" company="Adrian Conlon">
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// Copyright (c) Adrian Conlon. All rights reserved.
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// </copyright>
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namespace EightBit.GameBoy
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{
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public sealed class CharacterDefinition
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{
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private readonly Ram vram;
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private readonly ushort address;
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public CharacterDefinition(Ram vram, ushort address)
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{
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this.vram = vram;
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this.address = address;
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}
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public int[] Get(int row)
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{
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var returned = new int[8];
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var planeAddress = (ushort)(this.address + (row * 2));
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var planeLow = this.vram.Peek(planeAddress);
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var planeHigh = this.vram.Peek(++planeAddress);
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for (var bit = 0; bit < 8; ++bit)
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{
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var mask = 1 << bit;
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var bitLow = (planeLow & mask) != 0 ? 1 : 0;
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var bitHigh = (planeHigh & mask) != 0 ? 0b10 : 0;
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returned[7 - bit] = bitHigh | bitLow;
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}
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return returned;
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}
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}
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}
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