Just attach the shader to a ShaderMaterial and the ShaderMaterial to a Sprite2D or AnimatedSprite2D. Less suitable for textures with anti-aliased edges. Shader parameters:

• color
• width
• pattern (diamond, circle, square)
• inside
• add_margins (to make room for an outline)
• number_of_images (number of horizontal and vertical images in the sprite sheet)

When using a sprite sheet: if the images contain a few semi-transparent pixels from adjacent images, try increasing the 0.0 at lines 41 and 69 to a value like 0.1.