atlas

jit-op-op-avg-in-opengl

On Aug 23, 2006, at 11:42 AM, atlas wrote:

> in jitter nonOPENGL: I make a mixture similar to [jit.op @op avg] 

> between two matrices. but in openGL I want to do the same between 

> two surfaces with textures. the textures in addition have a 

> channel alpha that the more black the more is transparent. some 

> idea? thanks to all and the translator of google.

You probably can use something like the following set of attributes 

@blend_enable 1 (this turns on alpha blending)

@color 1. 1. 1. 0.5 (this gives an alpha value of 0.5)

@depth_enable 0 (this disables depth testing so that it will be 

drawn even if occluded by another object closer to camera)

@blend_mode 6 1 (this gives additive rather than crossfaded blending)

>
> How Can I do in openGL ?
> in jitter nonOPENGL: I make a mixture similar to [jit.op @op avg]  
> between two matrices.   but in openGL I want to do the same between  
> two surfaces with textures.  the textures in addition have a  
> channel alpha that the more black the more is transparent.   some  
> idea?  thanks to all and the translator of google.

You probably can use something like the following set of attributes  
to perform alpha blending

@blend_enable 1    (this turns on alpha blending)

@color 1. 1. 1. 0.5    (this gives an alpha value of 0.5)

@depth_enable 0    (this disables depth testing so that it will be  
drawn even if occluded by another object closer to camera)

@blend_mode 6 1   (this gives additive rather than crossfaded blending)

I just change blend_mode from 3 7 to 6 1 and run ok.

I just change blend_mode from 3 7 to 6 1 and run ok.
thanks.


¿ [jit.op @op avg] in OpenGL ?