Position of Sprite in Shader

[RujiK]

Is it possible to get a sprite's world-position inside of the fragment shader without passing a uniform?

v_vPosition/in_Position would be great except that it changes on a per-pixel basis. Meaning the v_vPosition at the bottom left of the sprite is different from the top right. I am trying to figure out how to find a single position for the whole sprite.

It doesn't even need to be very accurate. I just need a position-ish number that will stay the same for the whole sprite

Thanks for your help!

 

[flyingsaucerinvasion]

Do you mean when using draw_sprite functions or instance sprites? If so, the only thing I can think of is to encode the sprites position somehow into the image_blend or colour argument variables.

If you are drawing sprites using a vertex buffer, then you can add a custom vertex attribute to carry the sprite's position.