static void BuildTransform(Vector3 position, Vector2 size, SpriteFlags flags, out Matrix4x4 transform)
{
var offset = (flags & SpriteFlags.AlignmentMask) switch
{
0 => Vector3.Zero,
SpriteFlags.MidAligned => new Vector3(0, -0.5f, 0),
SpriteFlags.BottomAligned => new Vector3(0, -1.0f, 0),
SpriteFlags.LeftAligned => new Vector3(0.5f, 0, 0),
SpriteFlags.LeftAligned | SpriteFlags.MidAligned => new Vector3(0.5f, -0.5f, 0),
SpriteFlags.LeftAligned | SpriteFlags.BottomAligned => new Vector3(0.5f, -1.0f, 0),
_ => Vector3.Zero
};
transform = Matrix4x4.CreateTranslation(offset);
if (flags.HasFlag(SpriteFlags.Floor))
{
transform *= new Matrix4x4(
1, 0, 0, 0,
0, 0, -1, 0,
0, 1, 0, 0,
0, 0, 0, 1);
}
transform *= Matrix4x4.CreateScale(new Vector3(size.X, size.Y, size.X));
transform *= Matrix4x4.CreateTranslation(position);
}
SpriteInstanceData(Vector3 position, Vector2 size, Vector2 texPosition, Vector2 texSize, uint texLayer, SpriteFlags flags)
{
var offset = (flags & SpriteFlags.AlignmentMask) switch
{
0 => Vector3.Zero,
SpriteFlags.MidAligned => new Vector3(0, -0.5f, 0),
SpriteFlags.BottomAligned => new Vector3(0, -1.0f, 0),
SpriteFlags.LeftAligned => new Vector3(0.5f, 0, 0),
SpriteFlags.LeftAligned | SpriteFlags.MidAligned => new Vector3(0.5f, -0.5f, 0),
SpriteFlags.LeftAligned | SpriteFlags.BottomAligned => new Vector3(0.5f, -1.0f, 0),
_ => Vector3.Zero
};
var transform = Matrix4x4.CreateTranslation(offset);
if (flags.HasFlag(SpriteFlags.Floor))
{
transform *= new Matrix4x4(
1, 0, 0, 0,
0, 0, -1, 0,
0, 1, 0, 0,
0, 0, 0, 1);
}
transform *= Matrix4x4.CreateScale(new Vector3(size.X, size.Y, size.X));
transform *= Matrix4x4.CreateTranslation(position);
Transform1 = new Vector3(transform.M11, transform.M12, transform.M13);
Transform2 = new Vector3(transform.M21, transform.M22, transform.M23);
Transform3 = new Vector3(transform.M31, transform.M32, transform.M33);
Transform4 = new Vector3(transform.M41, transform.M42, transform.M43);
// Assume right column is always 0,0,0,1
TexPosition = texPosition;
TexSize = texSize;
TexLayer = texLayer;
Flags = flags;
}