voxel/Blocks.cs

namespace Voxel
{
    public enum Blocks : byte
    {
        Air,
        Stone,
        Dirt,
        OakPlanks,
        Grass
    }

    public enum Orientation : uint
    {
        West = 0,  // + X
        East = 1,  // - X
        Top = 2,   // + Y
        Bottom = 3,// - Y
        North = 4, // + Z
        South = 5, // - Z
    }

    public class BlockDefinition
    {
        public Blocks BlockType;
        public Textures[] FaceTextures;

        public BlockDefinition(Blocks type, Textures singleTexture)
        {
            BlockType = type;
            FaceTextures = new Voxel.Textures[6];
            for (int i = 0; i < 6; i++) FaceTextures[i] = singleTexture;
        }

        public BlockDefinition(
            Blocks type,
            Textures west,
            Textures east,
            Textures top,
            Textures bottom,
            Textures north,
            Textures south
        )
        {
            BlockType = type;
            FaceTextures = new Textures[]
            {
                west, east, top, bottom, north, south
            };
        }
    }

    public static class BlockDefinitions
    {
        public static readonly Dictionary<Blocks, BlockDefinition> Blocks;

        static BlockDefinitions()
        {
            Blocks = new Dictionary<Blocks, BlockDefinition>
            {
                { Voxel.Blocks.Stone, new BlockDefinition(Voxel.Blocks.Stone, Voxel.Textures.Stone) },
                { Voxel.Blocks.Dirt, new BlockDefinition(Voxel.Blocks.Dirt, Voxel.Textures.Dirt) },
                { Voxel.Blocks.OakPlanks, new BlockDefinition(Voxel.Blocks.OakPlanks, Voxel.Textures.OakPlanks) },

                { Voxel.Blocks.Grass, new BlockDefinition(
                    Voxel.Blocks.Grass,
                    Voxel.Textures.GrassSide,  // West
                    Voxel.Textures.GrassSide,  // East
                    Voxel.Textures.GrassTop,   // Top
                    Voxel.Textures.Dirt,       // Bottom
                    Voxel.Textures.GrassSide,  // North
                    Voxel.Textures.GrassSide   // South
                )},
            };
        }
    }
}