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Documentation on Sprite:setBlendMode — Gideros Forum
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    Documentation on Sprite:setBlendMode

    NascodeNascode Guru
    edited June 2012 in General questions
    Hello,

    I am experimenting with Sprite:setBlendMode and would like to know what combination of glblendfunc used for Sprite.ALPHA, Sprite.NO_ALPHA, Sprite.ADD, Sprite.MULTIPLY, and Sprite.SCREEN. I cant find the info on the reference.
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    Comments

    • evsevs Member
      Hello,

      This may help

      http://en.wikipedia.org/wiki/Blend_modes


      cheers

      evs

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    • atilimatilim Maintainer
      edited June 2012
      And here is the glBlendFunc combinations used in gideros:
      Sprite.ALPHA -> glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA)
Sprite.NO_ALPHA -> glBlendFunc(GL_ONE, GL_ZERO)
Sprite.ADD -> glBlendFunc(GL_ONE, GL_ONE)
Sprite.MULTIPLY -> glBlendFunc(GL_DST_COLOR, GL_ONE_MINUS_SRC_ALPHA)
Sprite.SCREEN -> glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_COLOR)
      The reason why Sprite.ALPHA is not implemented as glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) is because textures and all other transparency calculations are handled as premultiplied alpha.
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