Documentation on Sprite:setBlendMode

Nascode

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.

evs

Hello,

This may help

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


cheers

evs

atilim

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.