Utility to make it easier to work with 2D textures in OpenGL in go.
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SpriteSheets can be used to store textures and draw 2D 'sprites'.
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Sprites contain info on what part of the texture to draw and where to draw it
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ImagePacker can take png files and pack them into one texture.
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Adding a png to a packer returns a *Sprite that will represet the png in the texture
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call Pack() on your packer variable when you are done adding png's